WO2011162082A1 - Hinge device - Google Patents

Abstract

A hinge device is configured so that a second member does not perform a self-closing action near the fully open position of the second member, torque for a friction stop function is stable, and the wear of an engagement protrusion and an engagement recess is minimized. A hinge device for connecting a second member to a first member so that the second member can pivot about a shaft body, wherein the hinge device is provided with: a pair of cam members which have shaft holes through which the shaft body is inserted and which are respectively provided to the first member and the second member and can rotate relative to each other about the rotation center of the shaft holes while opposing cam surfaces are in surface contact with each other; and a pressing means which presses the pair of cam members in the direction in which the cam surfaces are in surface contact with each other. The opposing cam surfaces have formed thereon an engagement recess (22) and an engagement protrusion (23) which engage with each other. The engagement recess (22) and the engagement protrusion (23) respectively comprise three linear sections (22a, 22b, 22c) and three linear sections (23a, 23b, 23c), the three linear sections (22a, 22b, 22c) rectilinearly extending so as to be substantially parallel to each other at positions surrounding the rotation center, the three linear sections (23a, 23b, 23c) rectilinearly extending so as to be substantially parallel to each other at positions surrounding the rotation center.

Description

Hinge device

The present invention relates to a hinge device incorporated in a notebook computer, a mobile phone, or the like, for example, a hinge device that pivotally connects a lid to the main body so as to open and close the lid with respect to the main body.

FIG. 18 shows an example of the notebook personal computer 100. The main body (keyboard) is the first member 110, the lid (display) is the second member 120, and the second member 120 can be opened and closed to the first member 110. Is attached. The opening and closing of the second member 120 is performed by rotating the first member 110, and the second member 120 is pivotally connected to the first member 110. Therefore, the members 110 and 120 are hinged. They are connected by a device 130.

FIG. 19 is a diagram for explaining the characteristics required for the notebook personal computer 100 described above. The second member 120 made of a display is held at an arbitrary angle within a predetermined angle (20 to 180 °) range. A free stop function is required. Further, in the vicinity of full closure (0 to 20 °), a suction operation in which the second member 120 is closed by itself is required.

20 to 22 show a conventional hinge device 200 described in Patent Document 1. FIG. As shown in FIG. 20, in the hinge device 200, the first cam member 210 as a bracket is fixed to the first member 110 in a rising shape, and the second cam member 220 is attached to the second member 120. These cam members 210 and 220 are in surface contact with each other. A shaft member 230 is attached to the second member 120 with a screw 240, and a shaft portion 231 of the shaft member 230 passes through the first cam member and the second cam member 220.

The biasing means 270 formed by overlapping a plurality of disc springs is attached to the shaft portion 231 of the shaft member 230. The urging means 270 formed of a disc spring urges the second cam member 220 so as to press the first cam member 210. A washer 280 through which the shaft part 231 of the shaft member 230 passes is provided outside the biasing means 270, and the biasing means 270 is tightened by crimping the tip of the shaft part 231 of the shaft member 230 that has come out of the washer 280. Let it be bent. As a result, the biasing means 270 biases the second cam member 220.

FIG. 21 shows a first cam member 210 as a bracket, and a rising portion 211 rises from a base portion 227 fixed to the first member 110, and the shaft portion 231 of the shaft member 230 rotates on the rising portion 211. A circular shaft hole 213 penetrating therethrough is formed. A first cam surface 250 is formed on one surface of the rising portion 211. The first cam surface 250 includes a lowered fitting recess 310, a raised fitting projection 311 and a fitting recess 310, and an inclined surface 312 between the fitting projection 311. A plurality of holes are formed radially around the hole 213. In such a first cam surface 250, the fitting concave portion 310, the slope portion 312 and the fitting convex portion 311 are formed so as to be continuous along the circumferential direction.

FIG. 22 shows the second cam member 220. The second cam member 220 is formed of a plate member whose outer shape is circular. A non-circular shaft hole 223 is formed in the center portion of the second cam member 220, and the shaft portion 231 of the shaft member 230 formed in the same shape in the shaft hole 223 penetrates in a fitted state. Therefore, when the second member 120 is rotated and the shaft member 230 rotates together with the second member 120, the second cam member 220 rotates together with the shaft member 230.

A second cam surface 260 is formed on a surface of the second cam member 220 facing the first cam surface 250. The second cam surface 260 includes a lowered fitting recess 320, a raised fitting projection 321 and a fitting recess 320, and a sloped portion 322 between the fitting projections 321. A plurality of holes are formed radially around the hole 223. In such a second cam surface 260, the fitting recess 320, the slope 322, and the fitting projection 321 are formed so as to be continuous along the circumferential direction.

In the above structure, when the second member 120 is rotated in the closing direction from the open state of the second member 120, the second cam member 220 rotates integrally, and is near the fully closed state (opening angle 20 ° of the second member 120). In the vicinity), the fitting convex portion 321 of the second cam member 220 approaches the fitting concave portion 310 of the first cam member 210. At this time, the second cam member 220 can be sucked and closed by its own force due to the rotational torque caused by the slip between the inclined surfaces 322 and 312 and the weight of the second member 220.

In Patent Document 2, a fitting convex portion that is higher than the other portion through the slope portion is formed at one place on the cam surface of one cam member, while it is lower than the other portion through the slope portion. A hinge device is formed in which the fitting recess is formed in one place on the cam surface of the other cam member. These fitting convex portions and fitting concave portions have shapes extending along the rotation direction, and the second member 120 is held at a predetermined angle by fitting these fitting convex portions and fitting concave portions. A hinge device is described.

In Patent Document 3, a first fitting recess that engages with a first fitting protrusion provided on the cam surface of one cam member is provided on the cam surface of the other cam member, and the second member is in a closed state. The fitting projection and the fitting recess are configured to be in the middle of engagement, while the second fitting projection and the second fitting recess that are in the middle of engagement when the second member is in the closed state. A hinge device provided on the cam surface of one cam member and the cam surface of the other cam member is described. In this hinge device, the first fitting convex portion and the second fitting convex portion of one cam member are provided at substantially 180 ° symmetrical positions, and the first fitting concave portion and the second fitting concave portion of the other cam member are provided. They are provided at approximately 180 ° symmetrical positions. The second fitting convex portion is shorter than the first fitting concave portion, the second fitting concave portion is shorter than the first fitting convex portion, and the second member is in a closed state. Sometimes both the first fitting convex portion and the first fitting concave portion, the second fitting convex portion and the second fitting concave portion are in the middle of engagement, but when the second member is rotated in the opening direction, The first fitting convex portion passes through without falling into the second fitting concave portion, and at this time, the second fitting convex portion is supported to float on the first fitting concave portion.

In Patent Document 4, a first fitting recess that engages with a first fitting protrusion provided on the cam surface of one cam member is provided on the cam surface of the other cam member, and the second member is in a closed state. The fitting projection and the fitting recess are configured to be in the middle of engagement, while the second fitting projection and the second fitting recess that are in the middle of engagement when the second member is in the closed state. A hinge device provided on the cam surface of one cam member and the cam surface of the other cam member is described. The first fitting convex portion and the second fitting convex portion of one cam member are provided at a substantially 180 ° symmetrical position, and the first fitting concave portion and the second fitting concave portion of the other cam member are provided at a substantially 180 ° symmetrical position. Provided. Further, the distance from the rotation center of the first fitting convex part and the first fitting concave part is set different from the distance from the rotational center of the second fitting convex part and the second fitting concave part. Thus, when the second member is in the closed state, any of the fitting convex portions and the fitting concave portions are engaged, and when the second member is rotated in the opening direction, the first and second fitting convex portions The first fitting recess and the second fitting recess are not engaged with each other.

Japanese Utility Model Publication 3-43733 JP 2003-161311 A Japanese Patent No. 4044430 JP 2004-332874 A

In the hinge device of Patent Document 1, a suction operation is possible in which the second member closes by 20 ° when the second member is close to 20 °, but even at an angle (160 to 180 °) near the fully opened second member, Since the suction operation of the second member occurs, there is a problem that a free stop for holding the second member at an arbitrary angle cannot be performed at this angle.

Further, in the hinge device of Patent Document 2, since the fitting convex portion and the fitting concave portion are provided at one place on the circumference, in these non-engaged states, the cam member is inclined and the cam surface is kept parallel. Unable to do so, it will cause one-sided contact and the free stop torque will become unstable. The same applies to the hinge devices of Patent Documents 3 and 4, and there is a problem that the cam member cannot be tilted to maintain the parallelism of the cam surface.

In the hinge devices of Patent Documents 2, 3, and 4, the contact area of the cam surface of the cam member varies greatly depending on the opening angle of the second member, and the cam surface is in the vicinity of the second member fully closed (20 to 40 °). The contact pressure is increased, and wear of the shoulder portions in the fitting convex portion and the fitting concave portion is promoted, and the free stop torque is reduced. For this reason, there is a problem in that the start angle of the suction operation changes, which changes the timing of the suction operation.

The present invention has been made in consideration of the conventional problems as described above, can prevent the suction operation near the fully open second member, can stabilize the free stop torque, And it aims at providing the hinge apparatus which can suppress wear of a fitting crevice.

According to a first aspect of the present invention, in the hinge device for connecting the second member to the first member so as to be rotatable around the shaft body, the hinge device has a shaft hole through which the shaft body is inserted, and the first member and the first member A pair of cam members provided on each of the two members and capable of relative rotation about the rotation center of the shaft hole in a state where the opposing cam surfaces are in surface contact, and a pair in the direction in which the cam surfaces are in surface contact A biasing means for biasing the cam member, and a fitting recess and a fitting projection are formed on the opposed cam surface, and the fitting recess and the fitting projection are rotated. It is characterized by being formed by three streak-shaped portions extending substantially parallel to a straight line at a position surrounding the center.

Invention of Claim 2 is the hinge apparatus of Claim 1, Comprising: As for these three stripe shape parts, the one end side of a length direction exists in the surface of the said cam surface, and the other end side of a length direction is A straight line extending across the outer peripheral edge of the cam surface is provided.

The invention according to claim 3 is the hinge device according to claim 1 or 2, wherein the center of rotation is located inside a triangle connecting the midpoints in the length direction of the three stripe-shaped portions. It is characterized by being.

According to a fourth aspect of the present invention, in the hinge device according to any one of the first to third aspects, when the cam surface is divided with a center line passing through the rotation center as a boundary, one streak-shaped portion Is arranged on one division side, and two streak-shaped portions are arranged on the other division position.

A fifth aspect of the present invention is the hinge apparatus according to any one of the first to fourth aspects, wherein the three stripe-shaped portions are linearly extended at a position continuous with the shaft hole. It is formed by a shape portion and two streak-shaped portions extending linearly at both side positions sandwiching the shaft hole.

A sixth aspect of the present invention is the hinge apparatus according to any one of the first to fifth aspects, wherein the three stripe-shaped portions are in a vertical direction center line passing through the rotation center in the vertical direction. It is characterized by being formed in a symmetrical position.

According to a seventh aspect of the present invention, in the hinge device for connecting the second member to the first member so as to be rotatable about the shaft body, the hinge device has a shaft hole through which the shaft body is inserted. A pair of cam members provided on each of the two members and capable of relative rotation about the rotation center of the shaft hole in a state where the opposing cam surfaces are in surface contact, and a pair in the direction in which the cam surfaces are in surface contact A biasing means for biasing the cam member, and a fitting concave portion and a fitting convex portion are formed on the opposed cam surface, and the fitting concave portion and the fitting convex portion are formed on the shaft. It is formed by two streak-shaped portions that are provided at positions sandwiching the holes and that have a T-shaped arrangement extending linearly in the orthogonal direction.

The invention according to claim 8 is the hinge device according to claim 7, wherein the two stripe-shaped portions having the T-shaped arrangement are linear in a direction in which one stripe-shaped portion is continuous with the shaft hole. The other streak-shaped part extends linearly in a direction perpendicular to the one streak-shaped part in a state of being separated from the shaft hole.

A ninth aspect of the present invention is the hinge device according to any one of the first to eighth aspects, wherein a slope portion is provided around the fitting concave portion and the fitting convex portion. .

A tenth aspect of the present invention is the hinge apparatus according to the ninth aspect, wherein the slope portion has a width that continuously changes along a length direction of the streak-shaped portion.

According to the present invention, the suction operation near the fully open second member can be prevented, the free stop torque can be stabilized, and the wear of the fitting convex part and the fitting concave part can be suppressed.

(A), (b), (c) is the front view of the hinge apparatus of 1st Embodiment of this invention, a side view, and a top view. (A), (b), (c), (d) is the side view of the 1st cam member used for 1st Embodiment, a front view, a top view, and an EE sectional view. It is a perspective view of the 1st cam member used for 1st Embodiment. (A), (b), (c) is the side view of the 2nd cam member used for 1st Embodiment, a front view, and a partial side view. It is a perspective view of the 2nd cam member used for 2nd Embodiment. (A), (b), (c) is the front view, side view, and top view of a shaft member. It is a perspective view which shows the action | operation of 1st Embodiment. (A)-(d) is a side view which shows the action | operation of 1st Embodiment. FIGS. 9A to 9N are side views showing the operation of FIG. 8 in more detail. It is a characteristic view which shows the relationship between the opening angle of 1st Embodiment, and the surface pressure of a cam surface. It is a front view which shows the fitting recessed part of the 1st cam surface of 1st Embodiment. (A), (b) is a front view which shows the fitting recessed part of the 1st cam surface in the deformation | transformation state of 1st Embodiment. (A) to (c) are front views showing a preferred comparative example with respect to the first embodiment. It is a side view of the 1st cam member in 2nd Embodiment of this invention. It is a side view of the 2nd cam member in a 2nd embodiment. (A), (b), (c) is the side view, front view, and top view of a 1st cam member used for 3rd Embodiment of this invention. (A), (b), (c) is the side view of the 2nd cam member used for 3rd Embodiment of this invention, a front view, and a top view. It is a perspective view of a notebook type personal computer. It is a side view explaining the characteristic requested | required of a hinge apparatus. (A), (b), (c) is the front view, side view, and top view of the conventional hinge apparatus. (A), (b), (c) is the side view of the 1st cam member used for the conventional hinge apparatus, a front view, and a top view. (A), (b), (c) is the side view, front view, and top view of the 2nd cam member used for the conventional hinge apparatus.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. In each embodiment, the same member is assigned the same reference numeral.

(First embodiment)
1 to 13 show a first embodiment of the present invention. FIG. 1 shows the hinge device 1 of the first embodiment, FIGS. 2 and 3 show the first cam member 2, and FIGS. 2 shows the cam member 3, FIG. 6 shows the shaft member 4, FIGS. 7 to 9 show the contact state of the cam members 2 and 3, and FIG. 10 shows the relationship between the opening angle and the contact surface pressure of the cam surface. 11 and 12 show examples of the streak-shaped part of the first cam member 2, and FIG. 13 shows examples of the undesirable streak-shaped part.

The hinge apparatus 1 is provided in the hinge part which attaches the 2nd member 120 as a cover body so that opening and closing is possible with respect to the 1st member 110 as a main body similarly to the hinge apparatus 130 shown in FIG.15 and FIG.16.

As shown in FIG. 1, in the hinge device 1, a first cam member 2 as a bracket is fixed to the first member 110 in a rising shape, and a shaft member 4 is attached to the first cam member 2. A second cam member 3 is attached to 4. As shown in FIG. 2, the first cam member 2 is formed by a flat flange portion 2 a and a bearing portion 2 b rising upright from the flange portion 2 a, and the flange portion 2 a is screwed to the first member 110. 6 is fixed. In this fixed state, the bearing portion 2b rises from the first member 110.

As shown in FIG. 6, the shaft member 4 is formed by a main body 4a and a shaft body 4b extending integrally from one side surface of the main body 4a. As shown in FIG. 1, the main body 4 a is fixed to the second member 120 with screws 7. Therefore, when the second member 120 is rotated, the shaft member 4 rotates together with the second member 120. The shaft body 4b has a base portion 4c on the main body 4a side and a tip portion 4d extending from the base portion 4c. The base portion 4 c is formed in a non-circular outer shape obtained by cutting a circle in parallel, the tip end portion 4 d has a circular outer shape, and the non-circular base portion 4 c is inserted through the first cam member 2 and the second cam member 3. .

2 and 3, a circular shaft hole 11 passes through the bearing portion 2b of the first cam member 2. The shaft hole 11 penetrates the shaft body 4 b of the shaft member 4 in a rotatable manner, and the center portion of the shaft hole 11 becomes the rotation center 10 of the second cam member 3. One side surface (side surface on the second cam member 3 side) of the bearing portion 2b is a first cam surface 12, and the first cam surface 12 has a groove-like fitting recess 22 (22a, 22b). 22c) is formed.

As shown in FIG. 1, the second cam member 3 is provided so as to face the bearing portion 2 b (first cam surface 12) of the first cam member 2. As shown in FIGS. 4 and 5, the second cam member 3 is formed by a plate member having a circular outer shape, and a shaft body of the shaft member 4 is formed at the central portion of the second cam member 3. A non-circular shaft hole 14 corresponding to the shape of the base 4c in 4b is formed. The base portion 4c of the shaft body 4b of the shaft member 4 passes through the shaft hole 14 in a fitted state. Accordingly, when the second member 120 is rotated and the shaft member 4 rotates together with the second member 120, the second cam member 3 rotates relative to the first cam member 2 on the fixed side. The relative rotation of the second cam member 3 is performed around the rotation center 10 of the first cam member 2.

The surface of the second cam member 3 on the first cam member 2 side is a second cam surface 13 that comes into surface contact with the first cam surface 12 of the first cam member 2. Convex protrusions 23 (23a, 23b, 23c) that are convex and concave to be engaged with the recesses 22 (22a, 22b, 22c) are formed.

As shown in FIG. 1, the hinge device 1 is provided with a biasing means 5. The urging means 5 urges the second cam surface 13 of the second cam member 3 to come into surface contact with the first cam surface 12 of the first cam member 2. In this embodiment, the urging means 5 is formed by overlapping a plurality of disc springs, and the base 4c of the shaft body 4b of the shaft member 4 passes through each disc spring. A washer 8 through which the tip 4d of the shaft body 4b passes is provided outside the biasing means 5. The biasing means 5 is bent by crimping the tip 4d of the shaft 4b that has come out of the washer 8. State As a result, the biasing means 5 biases the second cam member 3, and the first cam surface 12 and the second cam surface 13 are in surface contact with each other.

Next, the first cam surface 12 and the second cam surface 13 will be described.

As shown in FIGS. 2 and 3, the fitting recess 22 of the first cam surface 12 is formed in a groove shape lower than the flat portion 24 of the first cam surface 12. The flat surface portion 24 is a portion where the second cam surface 13 of the second cam member 3 slides in a sliding state. The fitting recess 22 is formed by three stripe-shaped portions 22a, 22b, and 22c. The three streak-shaped portions 22a, 22b, and 22c are formed at positions surrounding the shaft hole 11 (rotation center 10) of the second cam member 3, and extend in a straight line shape. The three stripe-shaped portions 22a, 22b, and 22c are substantially parallel to each other.

The fitting recess 22 of the first cam surface 12 will be described in more detail with reference to FIGS. In the three streak-shaped portions 22a, 22b, and 22c constituting the fitting recess 22, one streak-shaped portion 22a is disposed at a position continuous with the shaft hole 11, and the other two streak-shaped portions 22b and 22c are It arrange | positions at the both right-and-left positions on both sides of the shaft hole 11. One streak-shaped portion 22a connected to the shaft hole 11 is formed by extending linearly so that one end side 31a faces the shaft hole 11 and the other end side 31b crosses the circular outer peripheral edge 36 of the first cam surface 12. Has been. On the other hand, the two streak-shaped portions 22b and 22c are disposed on both the left and right sides of the shaft hole 11, respectively. The two stripe-shaped portions 22 b and 22 c have one end sides 32 a and 33 a in the plane of the first cam surface 12 (in the plane portion 24), and the other end sides 32 b and 3 b are outer peripheral edges 36 of the shaft hole 11. Is formed so as to extend straight. The two stripe-shaped portions 22b and 22c extend in a direction opposite to the direction in which the single stripe-shaped portion 22a connected to the shaft hole 11 extends.

The three stripe-shaped portions 22a, 22b, and 22c extend in a straight line so as to be substantially parallel to each other, and the middle points 31c, 32c, and 33c in the length direction of the respective stripe-shaped portions 22a, 22b, and 22c are formed. The rotation center 10 is located inside the triangle 35 with respect to the formed triangle 35.

In this embodiment, as shown in FIGS. 2 and 11, the three streak-shaped portions 22 a, 22 b, and 22 c constituting the fitting recess 22 are in a vertical direction center line 16 that passes through the rotation center 10 in the vertical direction. Are provided at left and right symmetrical positions. That is, the streak-shaped part 22a is provided so as to coincide with the vertical center line 16, and the streak-shaped parts 22b, 22c are provided so as to have the same distance from the vertical center line 16 in the left-right direction.

Further, in this embodiment, in the three stripe-shaped portions 22a, 22b, and 22c, when the horizontal center line 17 that is orthogonal to the vertical center line 16 and passes through the rotation center 10 in the horizontal direction is used as a boundary, One is arranged on one division side with the direction center line 17 as a boundary, and two are arranged on the other division side. That is, as shown in FIG. 2, the stripe-shaped portion 22 a is provided on the upper side of the lateral center line 17, and the stripe-shaped portions 22 b and 22 c are provided on the lower side of the lateral center line 17. In FIG. 2, the streak-shaped portions 22 b and 22 c partially intersect with the horizontal center line 17, but most of the streak-shaped portions 22 b and 22 c are located on the lower side of the horizontal center line 17. The portions 22b and 22c are provided below the lateral center line 17.

An inclined surface portion 25 is provided around each fitting concave portion 22 including the stripe-shaped portions 22a, 22b, and 22c. The slope portion 25 is formed so as to be inclined obliquely upward toward the plane portion 24 in a state of surrounding the fitting recess 22. By providing the inclined surface portion 25 around the fitting concave portion 22, it becomes easy to slip, and the fitting with the fitting convex portion 23 of the second cam member 13 described later can be performed smoothly. The inclination angle of the inclined surface portion 25 can be set to be about twice the friction angle of the first cam member 2 and the second cam member 3, and by this setting, the detachment from the uneven fitting is easy. It becomes.

The fitting convex portion 23 of the second cam surface 13 is formed to face the fitting concave portion 22 of the first cam surface 12. That is, as shown in FIGS. 4 and 5, the fitting convex portion 23 of the second cam surface 13 is formed to have a higher ridge than the flat portion 26. The fitting convex portion 23 is formed by three stripe-shaped portions 23a, 23b, and 23c. Similar to the stripe-shaped portions 22a, 22b, and 22c on the first cam surface 12, the three stripe-shaped portions 23a, 23b, and 23c are located at positions that surround the shaft hole 14 (the rotation center 10 of the second cam member 3). Formed and extending in a straight line form. The three stripe-shaped portions 23a, 23b, and 23c are substantially parallel to each other.

The three stripe-shaped portions 23a, 23b, 23c constituting the fitting convex portion 23 of the second cam surface 13 correspond to the three stripe-shaped portions 22a, 22b, 22c of the first cam surface 12. These are formed in the same manner as the three stripe-shaped portions 22a, 22b and 22c of the first cam surface 12 shown in FIGS. That is, as shown in FIG. 4, one streak-shaped part 22a in the three streak-shaped parts 23a, 23b, and 23c constituting the fitting convex part 23 is arranged at a position continuous with the shaft hole 14, and the other two The line-shaped portions 22b and 22c of the book are arranged at both left and right positions with the shaft hole 14 in between. One streak-shaped portion 23 a connected to the shaft hole 14 has one end side (not shown) facing the shaft hole 14 and the other end side (not shown) crossing the circular outer peripheral edge 37 of the second cam surface 13. Thus, it is formed to extend linearly. On the other hand, the two streak-shaped portions 23b and 23c are arranged on both the left and right sides of the shaft hole 14, respectively, and one end side (not shown) is in the second cam surface 13 (in the plane portion 26). And the other end side (not shown) extends linearly so as to cross the outer peripheral edge 37 of the shaft hole 14. These two stripe-shaped portions 23b and 23c extend in a direction opposite to the direction in which one stripe-shaped portion 23a connected to the shaft hole 14 extends. In the second cam surface 13 as well, the center of rotation 10 is located inside a triangle (not shown) formed by connecting midpoints (not shown) in the longitudinal direction of the respective stripe-shaped portions 23a, 23b, 23c. To do.

In this embodiment, as shown in FIG. 4, the three stripe-shaped portions 23 a, 23 b, and 23 c constituting the fitting convex portion 23 are left and right with respect to the vertical center line 16 that passes through the rotation center 10 in the vertical direction. It is provided at a symmetrical position. That is, the streak-shaped part 23a is provided so as to coincide with the vertical center line 16, and the streak-shaped parts 23b, 23c are provided so as to have the same distance from the vertical center line 16 to the left and right.

Furthermore, in this embodiment, in the three stripe-shaped portions 23a, 23b, and 23c, when the horizontal center line 17 that is orthogonal to the vertical center line 16 and passes through the rotation center 10 in the horizontal direction is used as a boundary, One is arranged on one division side with the direction center line 17 as a boundary, and two are arranged on the other division side. That is, as shown in FIG. 4, the stripe-shaped portion 23 a is provided above the lateral center line 17, and the stripe-shaped portions 23 b and 23 c are provided below the lateral center line 17. In FIG. 4, the streak-shaped portions 23 b and 23 c partially intersect with the lateral center line 17, but most of the streak-shaped portions 23 b and 23 c are located below the lateral center line 17. , 23 c are provided below the horizontal center line 17.

An inclined surface portion 27 is provided around each fitting convex portion 23 including the stripe-shaped portions 23a, 23b, and 23c. The slope portion 27 is formed so as to be inclined obliquely downward toward the plane portion 26 in a state of surrounding the fitting convex portion 23. By providing the inclined surface portion 27 around the fitting convex portion 23, it becomes easy to slip, and the fitting with the fitting concave portion 22 of the first cam member 2 can be performed smoothly. The inclination angle of the inclined surface portion 27 can be set to be about twice the friction angle of the first cam member 2 and the second cam member 3, and by this setting, the detachment from the uneven fitting is easy. It becomes. In the above embodiment, the slope portion 25 of the first cam surface 12 and the slope portion 27 of the second cam surface 13 are formed with the same width around the corresponding fitting recess 22 and fitting projection 23. Is.

By forming the stripe-shaped portions 22a, 22b, and 22c of the respective fitting recesses 22 and the stripe-shaped portions 23a, 23b, and 23c of the fitting projections 23 under the above-described conditions, the second member 120 with respect to the first member 110 is formed. Only when the opening angle is 0 ° (360 °), the second cam member 3 is engaged with the first cam member 2 in a concave-convex manner, but at other angles, the second cam member 3 is not engaged. Hereinafter, the state of the cam members 2 and 3 according to the angle will be described with reference to FIGS. 7 shows a state in which the second cam member 3 is rotated by 40 ° about the rotation center 10, and FIGS. 8A to 8D show that the second cam member 3 is 0 ° with respect to the first cam member 2. 9 (a) to 9 (n) in a state where the second cam member 3 is rotated with respect to the first cam member 2 at a rotation angle indicated between 0 ° and 195 ° with the rotation angle of 40 °, 110 ° and 180 °. Indicates the state. FIG. 10 shows the relationship between the opening angle of the second member in the range of 0 to 180 ° and the surface pressure due to the contact of the cam surfaces 12 and 13, and the characteristic curve M is the characteristic curve N of the hinge device 1 of this embodiment. Is the conventional hinge device 200 of FIGS.

When the second member 120 is 0 ° with respect to the first member 110, as shown in FIGS. 8 (a) and 9 (a), the fitting recess 22 (three streaks shape) of the first cam surface 12 is provided. The fitting projections 23 (three stripe-shaped portions 23a, 23b, and 23c) of the second cam surface 13 are completely inserted into the portions 22a, 22b, and 22c) so that the projections and recesses fit. For this reason, the second member 120 is closed with respect to the first member 110.

In this embodiment, the three stripe-shaped portions 23a, 23b, 23c constituting the fitting convex portion 23 and the three stripe-shaped portions 22a, 22b, 22c constituting the fitting concave portion 22 are arranged as shown in FIG. Therefore, when the second member 120 is at an angle other than 0 °, the fitting convex portion 23 does not fit with the fitting concave portion 22. For this reason, even if the second member 120 has an angle (160 to 180 °) near the fully open position, the suction operation does not occur. Regions S1 and S2 in FIG. 10 are ranges in which a suction operation occurs, S1 indicates this embodiment, and S2 indicates a conventional device. In this embodiment, the suction operation does not occur near the fully open position. Further, as shown in FIG. 10 and as will be described later, since the three-stop torque is stable, a free stop at an angle (160 to 180 °) near the fully open position is possible.

Next, when the second member 120 in the closed state is opened and operated, the second cam member 13 rotates in the opening direction with respect to the first cam member 12, and the fitting convex portion 23 (three pieces) of the second cam surface 13 is rotated. The strip-shaped portions 23a, 23b, 23c) come out of the fitting concave portions 22 (three strip-shaped portions 22a, 22b, 22c) of the first cam surface 12, and the concave-convex fitting is released. At this time, since each fitting convex part 23 comes out while moving along the slope part 25 which the 1st cam surface 12 opposes, it can come out smoothly and can open the 2nd member 120 smoothly. Can do.

In the state in which the concave and convex fitting between the first cam surface 12 and the second cam surface 13 is released, the fitting convex portions 23 (three stripe-shaped portions 23a, 23b, and 23c) of the second cam surface 13 are the first cam. It slides while contacting the flat slide portion 24 of the surface 12 (see FIGS. 8B to 8E and FIGS. 9B to 9N). In this sliding, the three stripe-shaped portions 23a, 23b, 23c constituting the fitting convex portion 23 extend at positions surrounding the rotation center 10, and two stripe shapes are formed with respect to the stripe-shaped portion 23a. Since the portions 23 b and 23 c extend in opposite directions to the stripe-shaped portion 23 a on both sides of the shaft hole 14, the fitting convex portions 23 (the stripe-shaped portions 23 a, 23 b and 23 c) are formed on the flat portion 24 of the first cam surface 12. In contrast, it slides stably. For this reason, the parallelism of the cam surfaces 12 and 13 can be maintained, and the stable contact state can be ensured. Further, because of the stable contact state, as shown by the characteristic curve M in FIG. 10, the frictional force between the cam surfaces 12 and 13 is stable, and the free stop torque is stable. For this reason, even if the second member 120 is separated at an arbitrary angle, the first member 120 can be reliably held at that angle.

As shown in FIGS. 8B to 8D and FIGS. 9B to 9N, in the opening / closing operation of rotating the second member 120 in the forward / reverse direction, the fitting protrusion of the second cam surface 13 is provided. The portion 23 (three stripe-shaped portions 23 a, 23 b, 23 c) is in contact with the substantially entire surface of the flat portion 24 of the first cam surface 12. In this case, a part of the fitting convex part 23 (three stripe-shaped parts 23a, 23b, 23c) is a fitting concave part 22 (three stripe-shaped parts 22a, 22b, 22c), but the influence on the contact area with the flat portion 24 of the first cam surface 12 is small. For this reason, there is little change in the relationship between the rotation angle of the second member 120 and the contact area, the surface pressure between the cam surfaces 12 and 13 is stabilized, and the free stop torque can be stabilized.

In the opening angle of the second member 120, in particular, the contact area at the opening angle of 20 ° to 40 ° in the vicinity of the fully closed state where the concave and convex fitting is performed is larger than that of the conventional structure of FIGS. For this reason, the surface pressure of the cam surfaces 12 and 13 at this opening angle does not increase, and wear of the shoulder portions of the fitting concave portion 22 and the fitting convex portion 23 can be suppressed. Thereby, the change of the starting angle of suction operation can be controlled, and the secular change of suction operation can be made small. Further, the three stripe-shaped portions 22a, 22b and 22c constituting the fitting concave portion 22 of the first cam surface 12 are in a parallel state, and 3 constituting the fitting convex portion 23 of the second cam surface 13 Since the stripe-shaped portions 23a, 23b, and 23c of the book are in a parallel state, the crossing angle when the unevenness passes in the crossing state becomes large, the torque is small, and it can pass stably.

In addition to the above, in this embodiment, the fitting concave portion 22 (three stripe-shaped portions 22a, 22b, 22c) of the first cam surface 12 and the fitting convex portion 23 (three stripes) of the second cam surface 13 are used. Since the slope portions 25 and 27 are formed around the shape portions 23a, 23b, and 23c), the concave / convex fitting and the release thereof, and the transition to the free stop state can be performed with a small torque fluctuation. For this reason, the rotation operation when opening and closing the second member 120 can be performed smoothly.

FIGS. 12A and 12B show various modifications of this embodiment. These deformation states are described for the streak-shaped portions 22 a, 22 b, 22 c in the fitting recess 22 of the first cam member 2, but the streak-shaped portion 23 a in the fitting convex portion 23 of the second cam member 3. , 23b, and 23c are similarly applied.

In FIG. 12A, one streak-shaped portion 22 a connected to the shaft hole 11 in the fitting recess 22 is shifted to the right from the longitudinal center line 16 of the shaft hole 11. Also in this case, the one end side 31 a faces the shaft hole 11, and the other end side 31 b extends linearly so as to cross the outer peripheral edge 36 of the first cam surface 12.

On the other hand, the two streak-shaped portions 22b and 22c at both the left and right positions sandwiching the shaft hole 11 in the fitting recess 22 extend linearly in the opposite direction to the streaked portion 22a. The two streak-shaped portions 22b and 22c are formed at asymmetric positions with the longitudinal center line 16 as the center. The streak-shaped part 22b is short, while the streak-shaped part 22b is somewhat longer, and the lengths of the streak-shaped parts 22b and 22c are different. Also in this case, in addition to the three stripe-shaped portions 22a, 22b, and 22c being substantially parallel, the one end sides 32a and 33a of the two stripe-shaped portions 22b and 22c are formed on the first cam surface 12. The other end sides 32 b and 33 b extend linearly so as to cross the outer peripheral edge 36 of the first cam surface 12. Further, the rotation center 10 is positioned inside a triangle 35 formed by connecting the midpoints 31c, 32c, 33c in the length direction of the three stripe-shaped portions 22a, 22b, 22c.

In FIG. 12 (b), one streak-shaped portion 22 a connected to the shaft hole 11 has one end side 31 b in the plane of the first cam surface 11 (in the plane portion 24), while the intermediate portion has the shaft hole 11. In the straddling state, the other end side 31b extends linearly so as to cross the outer peripheral edge 36 of the first cam surface 12. The single stripe-shaped portion 22 a is provided at a position that coincides with the longitudinal center line 16.

On the other hand, the two stripe-shaped portions 22b and 22c at the left and right positions sandwiching the shaft hole 11 in the fitting recess 22 extend linearly in the opposite direction to the single stripe-shaped portion 22a. The two stripe-shaped portions 22b and 22c are formed so as to have the same length at both the left and right positions when the longitudinal center line 16 is the center. Further, the three stripe-shaped portions 22a, 22b, and 22c are substantially parallel, and the other end sides 32b and 33b of the two stripe-shaped portions 22b and 22c are within the plane of the first cam surface 12 (plane The one end sides 32 a and 33 a cross the outer peripheral edge 36 of the first cam surface 12. Also in this case, the rotation center 10 is positioned inside a triangle 35 formed by connecting the midpoints 31c, 32c, 33c in the length direction of the three stripe-shaped portions 22a, 22b, 22c. .

As shown in FIGS. 12 (a) and 12 (b), by forming three streak-shaped portions 22a, 22b, and 22c, the suction operation in the vicinity of the fully open state is performed as in the first embodiment shown in FIGS. Can be prevented, free stop torque can be stabilized, and wear of the fitting convex portion 23 and the fitting concave portion 22 can be suppressed.

FIG. 13 shows a comparative example when the above-described first embodiment and its modifications are not preferable. In FIG. 13A, with respect to a single streak-shaped portion 22a that is continuous with the shaft hole 11, streak-shaped portions 22b and 22c on both the left and right sides sandwiching the shaft hole 11 are provided at left and right symmetrical positions. The streak-shaped portions 22 b and 22 c extend linearly so that both end portions 32 a and 32 b and 33 a and 33 b cross the outer peripheral edge 36 of the first cam surface 12. In such a structure, the rotation center 10 is not located inside the triangle connecting the midpoints 31c, 32c, 33c of the three stripe-shaped portions 22a, 22b, 22c.

In FIG. 13B, one end side 32a and 33a of the two stripe-shaped portions 22b and 22c on both the left and right sides of the shaft hole 11 are in the plane of the first cam surface 12 (in the plane portion 24). The other end portions 32 b and 33 b extend linearly so as to cross the outer peripheral edge 36 of the first cam surface 12. On the other hand, the single streak-shaped portion 22 a connected to the shaft hole 11 extends linearly over the entire width of the first cam surface 12 in a state of straddling the shaft hole 11. In such a structure, the rotation center 10 is not located inside the triangle connecting the midpoints 31c, 32c, 33c of the three stripe-shaped portions 22a, 22b, 22c.

In the structure shown in FIGS. 13A and 13B, when the second cam member 3 is rotated by 180 ° with respect to the first cam member 2, in FIG. 13A, two streaks are formed. 22b, 22c and the two stripe-shaped portions 23b, 23c in the fitting convex portion 23 of the second cam member 3 are opposed to each other. In FIG. 13B, the single stripe-shaped portion 22a and the second stripe-shaped portion 22a It becomes the position where one stripe shape part 23a in fitting convex part 23 of 2 cam members 3 counters. For this reason, in FIG. 13A, only one streak-shaped portion 23a in the fitting convex portion 23 contacts the flat portion 25 of the first cam member 2, and in FIG. Only the two streak-shaped portions 23b, 23c in the portion 23 are in contact with the flat surface portion 25 of the first cam member 2, and the three-strand-shaped support portions 23a, 23b, 23c are out of the three-point support state. Is unstable. In addition, since the area where the fitting convex portion 23 of the second cam member 3 slides with the flat portion 25 of the first cam member 2 is reduced, it is possible to ensure stable rotation of the second cam member 3. There is a drawback that can not be.

In FIG. 13 (c), two streak-shaped portions 22b and 22c on both the left and right sides sandwiching the shaft hole 11 are formed in an oblique direction, and the three streak-shaped portions 22a, 22b and 22c are parallel to each other. is not.

In FIGS. 13A to 13C, the effects as shown in FIGS. 11 to 13 cannot be obtained.

(Second Embodiment)
14 and 15 show a hinge device according to a second embodiment of the present invention. FIG. 14 shows a first cam member 2 and FIG. 15 shows a second cam member 3 in the hinge device.

In this embodiment, the first cam member 2 is fixedly attached to the first member 110 side, and the second cam member 3 is attached to the second member 120 via a shaft member 4 (see FIG. 6, not shown). . The first cam member 2 and the second cam member 3 are formed with a first cam surface 12 and a second cam surface 13 that are in surface contact with each other. A fitting recess 22 is formed on the first cam surface 12, and a fitting protrusion 23 that fits into the fitting recess 22 is formed on the second cam surface 13. The first cam member 2 is formed with a circular shaft hole 11 through which the shaft body 4b of the shaft member 4 (see FIG. 6, not shown) is rotatably passed, and the second cam member 3 has a shaft body. A non-circular shaft hole 14 is formed through which 4b fits.

The fitting recess 22 is formed in the same manner as in the first embodiment shown in FIGS. 2 and 11, and one streak-shaped portion 22a is arranged at a position continuous with the shaft hole 11, and the other two streaks. The shape portions 22b and 22c are arranged on both the left and right positions with the shaft hole 11 in between. One streak-shaped portion 22 a connected to the shaft hole 11 has one end (not shown) facing the shaft hole 11 and the other end (not shown) crossing the circular outer peripheral edge 36 of the first cam surface 12. It is formed extending in a straight line. The two streak-shaped portions 22b and 22c are arranged on both the left and right sides of the shaft hole 11, and one end side (not shown) is in the plane of the first cam surface 12 (in the plane portion 24). The other end side (not shown) extends linearly so as to cross the outer peripheral edge 36 of the shaft hole 11. The two stripe-shaped portions 22b and 22c extend in a direction opposite to the direction in which the single stripe-shaped portion 22a connected to the shaft hole 11 extends. The three stripe-shaped portions 22a, 22b, and 22c are substantially parallel to each other and extend in a straight line, and are formed by connecting midpoints in the length direction of the respective stripe-shaped portions 22a, 22b, and 22c. For the triangle (not shown), the rotation center 10 is located inside the triangle.

The second cam member 3 in this embodiment is formed in the same manner as the second cam member 3 in the first embodiment. That is, the fitting convex part 23 of the cam surface 13 is formed to have a higher ridge than the planar slide part 26 as shown in FIG. The fitting convex portion 23 is formed by three stripe-shaped portions 23 a, 23 b, and 23 c, and the three stripe-shaped portions 23 a, 23 b, and 23 c surround the rotation center 10 of the second cam member 3. It is formed at the vertical position and extends linearly in parallel. These three stripe-shaped portions 23a, 23b, and 2c are positioned symmetrically with respect to a vertical center line 16 (see FIG. 2, not shown) that passes through the rotation center 10 in the vertical direction, as in the first embodiment. The stripe-shaped portion 23a is provided so as to coincide with the vertical center line, and the stripe-shaped portions 23b, 23c are provided so as to have the same distance from the vertical center line to the left and right.

The three streak-shaped portions 23a, 23b, and 23c are arranged on the horizontal center line 17 (see FIG. 2, not shown) that is perpendicular to the vertical center line 16 and that passes through the rotation center 10 in the horizontal direction. One is arranged on one divided side and two are arranged on the other divided side with the direction center line 17 as a boundary, and a streak-shaped part 23a is provided on the upper side of the horizontal center line, and a streak-shaped part 23b and 23c are provided below the horizontal center line.

Furthermore, one streak-shaped part 22a in the three streak-shaped parts 23a, 23b, 23c constituting the fitting convex part 23 is arranged at a position continuous with the shaft hole 14, and the other two streak-shaped parts 22b, 22c is arrange | positioned in the both right-and-left position which pinched | interposed the shaft hole 14. FIG. One streak-shaped portion 23 a connected to the shaft hole 14 has one end side (not shown) facing the shaft hole 14 and the other end side (not shown) crossing the circular outer peripheral edge 37 of the second cam surface 13. It is formed extending in a straight line. On the other hand, the two streak-shaped portions 23b and 23c are arranged on both the left and right sides of the shaft hole 14, respectively, and one end side (not shown) is in the second cam surface 13 (in the plane portion 26). And the other end side (not shown) extends linearly so as to cross the outer peripheral edge 37 of the shaft hole 14. The two stripe-shaped portions 23b and 23c extend in a direction opposite to the direction in which the single stripe-shaped portion 23a connected to the shaft hole 14 extends. Also in the second cam surface 13, the rotation center 10 is located inside a triangle (not shown) formed by connecting midpoints (not shown) in the longitudinal direction of the respective stripe-shaped portions 23a, 23b, 23c. Yes.

A slope portion 27 is provided around the streak-shaped portions 23a, 23b, and 23c. The slope portion 27 is formed so as to be inclined obliquely downward toward the slide portion 26 in a state of surrounding the fitting convex portion 23. The slope portion 27 in the second cam surface 13 is formed to have the same width along the length direction of the stripe-shaped portions 23a, 23b, and 23c.

On the other hand, on the first cam surface 12 of the first cam member 2, as shown in FIG. 14, a groove-like fitting recess 22 lower than the flat slide portion 24 is formed. The fitting recess 22 is formed by three stripe-shaped portions 22 a, 22 b, 22 c, and the three stripe-shaped portions 22 a, 22 b, 22 c surround the rotation center 10 of the second cam member 3. And at this position extends in a straight line in the same direction and substantially parallel. The three stripe-shaped portions 22a, 22b, and 22c are provided at symmetrical positions with respect to a vertical center line 16 (see FIG. 2, not shown) passing through the rotation center 10 in the vertical direction. The portion 22a is provided so as to coincide with the vertical center line 16, and the streak-shaped portions 22b, 22c are provided so as to have the same distance from the vertical center line 16 to the left and right.

Further, the three streak-shaped portions 22a, 22b, and 22c are bounded by the horizontal center line 17 when the horizontal center line 17 that is orthogonal to the vertical center line 16 and passes through the rotation center 10 in the horizontal direction is a boundary. 1 is arranged on one divided side, and two are arranged on the other divided side. The stripe-shaped portion 22a is provided on the upper side of the horizontal center line 17, and the stripe-shaped portions 22b and 22c are arranged horizontally. It is provided below the direction center line 17.

A slope portion 25A is provided around the streak-shaped portions 22a, 22b, and 22c. The slope portion 25A is formed so as to be inclined obliquely upward toward the slide portion 24 in a state of surrounding the fitting recess 22. The slope portion 25A of the first cam member 2 is formed such that the width continuously changes along the length direction of the streak-shaped portions 22a, 22b, and 22c. Specifically, the width is small at a portion close to the shaft hole 11, and the width gradually increases continuously as the distance from the shaft hole 11 increases.

In the second embodiment as described above, the fitting concave portion 22 and the fitting convex portion 23 are formed in the same manner as in the first embodiment, and thus can operate in the same manner as in the first embodiment. In addition to this, since the width of the slope portion 25A in the streaked portions 22a, 22b, 22c of the first cam member 2 continuously changes along the length direction of the streaked portion, the second cam member 3 The contact area of the fitting convex portion 23 with the slope portion 25A gradually increases. That is, during the rotation of the second cam member 3 accompanying the rotation of the second member 120, the fitting convex portion 23 of the second cam member 3 comes into contact with a portion having a large width in the slope portion 25A, and then gradually increases in width. The contact area in the direction increases. By gradually changing the contact area in this manner, the frictional force of the cam members 2 and 3 changes gradually, so that the operability when rotating the second member 120 is improved and the suction start angle can be changed. There is merit to do.

(Third embodiment)
16 and 17 show a hinge device according to a third embodiment of the present invention. FIG. 16 shows a first cam member 52 and FIG. 17 shows a second cam member 53 in the hinge device of the third embodiment.

The hinge device of this embodiment is provided at a portion where the second member 120 is rotatably connected to the first member 110 (see FIG. 18). The hinge device includes a first cam member 52 that is fixedly attached to the first member 110, and a second cam member 53 that is attached so as to rotate integrally with the shaft member 4 (see FIG. 6) attached to the second member 120. Further, biasing means 5 (see FIG. 1) for biasing the cam surfaces 52c and 53c of these cam members 52 and 53 so as to come into surface contact with each other is provided.

As shown in FIG. 16, the first cam member 52 includes a flange portion 52a that is screwed to the first member 110, and a bearing portion 52b that stands upright on the flange portion 52a. A circular shaft hole 61 passes therethrough, and the shaft body 4 b of the shaft member 4 is rotatably inserted into the shaft hole 61. The center portion of the shaft hole 61 becomes the rotation center 60 of the second cam member 53. One side surface of the bearing portion 52b is a first cam surface 52c. On the first cam surface 52c, groove-shaped fitting recesses 72 (stripe-shaped portions 72a and 72b) are formed.

As shown in FIG. 17, the second cam member 53 is formed by a plate member having a circular outer shape. A non-circular shaft hole 64 is formed in the center portion of the second cam member 53, and the shaft body 4 b of the shaft member 4 passes through the shaft hole 64 in a fitted state. Therefore, the second cam member 53 rotates integrally with the rotation of the shaft member 4 that is rotated by the rotation operation of the second member 120, whereby the first cam member 52 and the second cam member 53 are relative to each other. Rotate. This relative rotation is performed around the rotation center 60 of the first cam member 52.

The surface of the second cam member 53 on the first cam member 52 side is a second cam surface 53c that comes into surface contact with the first cam surface 52c of the first cam member 52, and is fitted on the second cam surface 53c. Convex protrusions 73 (stripe-shaped portions 73a and 73b) that are concavely and convexly engaged with the joint recesses 72 are formed.

As shown in FIG. 16, the fitting recess 72 of the first cam surface 52c is formed in a groove shape lower than the flat portion 74. The flat surface portion 74 is a surface on which the second cam member 53 slides in a sliding state. The fitting recess 72 is formed by two stripe-shaped portions 72a and 72b. The two streak-shaped portions 72a and 72b are formed at positions sandwiching the shaft hole 61 (positions sandwiching the rotation center 60). Further, the two stripe-shaped portions 72a and 72b have a T-shaped arrangement extending linearly in the orthogonal direction. That is, the streak-shaped portion 72a extends linearly in a direction continuous to the shaft hole 61 of the first cam member 52, while the other streak-shaped portion 72b is orthogonal to the streak-shaped portion 72a while being separated from the shaft hole 61. It extends linearly in the direction. In this case, the other stripe-shaped portion 72b extends linearly over the entire width of the first cam surface 52c.

A slope portion 75 is provided around each of the streak-shaped portions 72 a and 72 b constituting the fitting recess 72. The slope portion 75 is formed so as to be inclined obliquely upward toward the plane portion 74 in a state of surrounding the fitting recess 72 by sandwiching the fitting recess 72. By providing the inclined surface portion 75 around the fitting recess 72, it becomes easy to slip, and the fitting with the fitting projection 73 of the second cam member 53 can be performed smoothly. The inclination angle of the inclined surface portion 75 is preferably about twice the friction angle of the first cam member 52 and the first cam member 52 and the second cam member 53, thereby facilitating detachment from the uneven fitting.

17, the fitting convex part 73 of the 2nd cam surface 53c is formed so that the fitting recessed part 72 of the 1st cam surface 52c may be opposed. The fitting convex part 73 of the 2nd cam surface 53c is formed so that it may become convex shape rather than the planar slide part 76. FIG. The fitting convex part 73 is formed by two stripe-shaped parts 73a and 73b. The two streak-shaped portions 73a and 73b are formed at positions sandwiching the shaft hole 64 (positions sandwiching the rotation center 60). The two streak-shaped portions 73a and 73b have a T-shaped arrangement extending linearly in the orthogonal direction. That is, the streak-shaped portion 73a extends linearly in a direction continuous to the shaft hole 64 of the first cam member 52, while the other streak-shaped portion 73b is perpendicular to the streak-shaped portion 73a while being separated from the shaft hole 64. It extends linearly in the direction. The other streak-shaped portion 73b extends linearly over the entire width of the second cam surface 53c.

A slope portion 77 is provided around each of the streak-shaped portions 73a and 73b constituting the fitting convex portion 73. The slope portion 77 is formed so as to be inclined obliquely downward toward the plane portion 76 in a state of surrounding the fitting convex portion 73 by sandwiching the fitting convex portion 73. By providing the slope portion 77 around the fitting convex portion 73, it becomes easy to slip, and the fitting with the fitting concave portion 72 of the first cam member 52 can be performed smoothly. The inclination angle of the slope portion 77 is preferably about twice as large as the friction angle of the first cam member 52 and the first cam member 52 and the second cam member 53, thereby facilitating detachment from the uneven fitting.

In the hinge device of the third embodiment, since the streak-shaped portions 72a, 72b, 73a, 73b are arranged in a T shape, the opening of the second member 120 relative to the first member 110 is the same as in the first embodiment. The second cam member 3 engages with the first cam member 2 only when the angle is 0 ° (360 °), but does not fit at other angles. For this reason, even if the second member 120 has an angle (160 to 180 °) near the fully open position, the suction operation does not occur. Also, as will be described later, since the three-stop torque is stable, a free stop at an angle (160 to 180 °) near the fully open position is possible. Further, because of the T-shaped arrangement, the fitting convex portion 73 and the fitting concave portion 72 intersect at a large angle close to orthogonal at an angle (160 to 180 °) near the fully closed position, so that the fitting convex portion 73 at the time of passage is obtained. And the interference of the fitting recess 72 is reduced.

In this embodiment, when the second member 120 in the closed state is opened, the second cam member 53 rotates in the opening direction with respect to the first cam member 52, and the second cam surface 53c fitting convex portion 73 (2 The two stripe-shaped portions 73a and 73b) come out of the fitting recess 72 (two stripe-shaped portions 72a and 72b) of the first cam surface 52c, and the uneven fitting is released. At this time, since the fitting convex part 73 comes out while moving along the slope part 75 which the 1st cam surface 52c opposes, it can come out smoothly and can open the 2nd member 120 smoothly. .

In the state in which the concave-convex fitting between the first cam surface 12 and the second cam surface 13 is released, the fitting convex portion 73 (two streak-shaped portions 73a, 73b) of the second cam surface 53c is the first cam surface 52c. It slides in contact with the flat portion 74 of the. In this sliding, the two stripe-shaped portions 73 a and 73 b constituting the fitting convex portion 73 and the two stripe-shaped portions 72 a and 72 b constituting the respective fitting concave portions 72 are surrounded by the rotation center 10. In addition, since the T-shaped arrangement extends in the orthogonal direction, the parallelism of the cam surfaces 52c and 53c can be maintained. For this reason, the stable contact state is securable. Further, because of the stable contact state, the frictional force between the cam surfaces 52c and 53c is stable, and the free stop torque is stable. For this reason, even if the second member 120 is separated at an arbitrary angle, the first member 120 can be reliably held at that angle.

Further, in the opening / closing operation of the second member 120, the fitting convex portion 73 (the two streak-shaped portions 73a and 73b) of the second cam surface 53c comes into contact with the substantially entire surface of the flat portion 74 of the first cam surface 52c. . For this reason, there is little change in the relationship between the rotation angle of the second member 120 and the contact area, the surface pressure of the cam surfaces 52c and 53c is stabilized, and the free stop torque can be stabilized.

In the opening angle of the second member 120, in particular, the contact area at the opening angle of 20 ° to 40 ° in the vicinity of the fully closed state where the projections and recesses are fitted is larger than that of the conventional structure shown in FIGS. For this reason, the surface pressure of the cam surfaces 52c and 53c at this open angle does not increase, and wear of the shoulder portions of the fitting concave portion 72 and the fitting convex portion 73 can be suppressed. Thereby, the change of the starting angle of suction operation can be controlled, and the secular change of suction operation can be made small.

Furthermore, around the fitting recess 72 (two stripe-shaped portions 72a and 72b) of the first cam surface 52c and the fitting convex portion 73 (two stripe-shaped portions 73a and 73b) of the second cam surface 53c. Since the slope portions 75 and 77 are formed, it is possible to engage and disengage the concave and convex, and further shift to a free stop state with a small torque fluctuation. For this reason, the rotation operation when opening and closing the second member 120 can be performed smoothly.

DESCRIPTION OF SYMBOLS 1 ... Hinge apparatus 2, 52 ... 1st cam member 3, 53 ... 2nd cam member 10, 60 ... Rotation center 11, 14, 61, 64 ... Shaft hole 12, 52c ... 1st cam surface 13, 53c ... 2nd Cam surfaces 22, 72 ... fitting recesses 22a, 22b, 22c, 72a, 72b ... streak-shaped parts 23a, 23b, 23c, 72a, 72b ... streak-shaped parts 24, 26, 74, 76 ... planar parts 25, 25A, 27 , 75, 77 ... Slope

Claims (10)

1. In the hinge device for connecting the second member to the first member so as to be rotatable around the shaft body,
   A shaft hole through which the shaft body is inserted is provided in each of the first member and the second member, and is relatively rotatable around the rotation center of the shaft hole in a state where the opposing cam surfaces are in surface contact. A pair of cam members, and biasing means for biasing the pair of cam members in a direction in which the cam surfaces come into surface contact with each other,
   A fitting recess and a fitting projection are formed on the opposed cam surfaces, and the fitting recess and the fitting projection extend linearly in a straight line at a position surrounding the rotation center. A hinge device characterized by being formed by a streak-shaped portion of a book.
2. The three stripe-shaped portions have a linear shape extending so that one end side in the length direction is in the surface of the cam surface and the other end side in the length direction crosses the outer peripheral edge of the cam surface. The hinge device according to claim 1, wherein:
3. The hinge device according to claim 1 or 2, wherein the center of rotation is located inside a triangle connecting midpoints in the length direction of the three stripe-shaped portions.
4. When the cam surface is divided with a center line passing through the rotation center as a boundary, one stripe-shaped portion is arranged on one division side, and two stripe-shaped portions are arranged on the other division position. The hinge device according to any one of claims 1 to 3, wherein:
5. The three stripe-shaped portions are formed by one stripe-shaped portion extending linearly at a position continuous with the shaft hole, and two stripe-shaped portions extending linearly at both side positions sandwiching the shaft hole. The hinge device according to any one of claims 1 to 4, wherein the hinge device is provided.
6. The hinge according to any one of claims 1 to 5, wherein the three stripe-shaped portions are formed symmetrically with respect to a vertical center line passing through the rotation center in the vertical direction. apparatus.
7. In the hinge device for connecting the second member to the first member so as to be rotatable around the shaft body,
   A shaft hole through which the shaft body is inserted is provided in each of the first member and the second member, and is relatively rotatable around the rotation center of the shaft hole in a state where the opposing cam surfaces are in surface contact. A pair of cam members, and biasing means for biasing the pair of cam members in a direction in which the cam surfaces come into surface contact with each other,
   A fitting recess and a fitting protrusion are formed on the facing cam surface, and the fitting recess and the fitting protrusion are provided at positions sandwiching the shaft hole and in a direction orthogonal to each other. A hinge device characterized in that the hinge device is formed by two stripe-shaped portions having a T-shaped arrangement extending linearly.
8. The two stripe-shaped portions having the T-shaped arrangement are such that one stripe-shaped portion extends linearly in a direction continuous with the shaft hole, and the other stripe-shaped portion is separated from the shaft hole. 6. The hinge device according to claim 5, wherein the hinge device extends linearly in a direction orthogonal to the one stripe-shaped portion.
9. The hinge device according to any one of claims 1 to 8, wherein a slope portion is provided around the fitting concave portion and the fitting convex portion.
10. 10. The hinge device according to claim 9, wherein the slope portion has a width that continuously changes along a length direction of the stripe shape portion.

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