JP3550546B2 - Hinge mechanism - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hinge mechanism for an automobile trunk lid or the like.
[0002]
[Prior art]
Generally, various springs such as spiral springs, tension coil springs, and torsion bars are used in a hinge mechanism of a trunk lid of an automobile as a balancer for reducing an operation force when opening and closing the trunk lid having a weight of more than 10 kg. The balance between the moment of its own weight and the moment by the spring is achieved so that the trunk lid can be opened and closed smoothly.
[0003]
For example, the hinge mechanism of the spiral spring includes a spiral spring portion provided on the vehicle body side, a link provided on the trunk lid side, and when the trunk lid is opened and closed, the link is actuated by extending or contracting the spiral spring to open and close the link. The force is reduced (for example, see Japanese Utility Model Laid-Open No. 6-49273, Japanese Utility Model Laid-Open No. 62-11980).
[0004]
In Japanese Unexamined Utility Model Publication No. 6-49273, the spiral spring is retrofitted in order to prevent the torque of the spiral spring from being reduced due to the heat effect at the time of paint baking.
[0005]
The hinge mechanism of the tension coil spring is provided with one end of a hinge bracket rotatably on the vehicle body side, a trunk lid connected to the other end of the hinge bracket, and the trunk lid is always opened by a tension coil spring attached to the hinge bracket. (See, for example, FIGS. 2 and 3 of Japanese Patent Application Laid-Open No. 5-330456).
[0006]
The hinge mechanism of the torsion bar connects the hinge brackets provided on the left and right sides of the vehicle body side and the hinge members provided on the left and right sides of the trunk lid side so as to be rotatable about hinge axes, respectively. The U-shaped end formed at one end of the torsion bar is attached to the bracket, the other end is inserted into the through hole of the right or left hinge member, and the trunk lid is constantly urged in the opening direction (for example, see Japanese Unexamined Patent Application Publication No. And FIGS. 5 and 6 of JP-A-330456).
[0007]
[Problems to be solved by the invention]
However, the hinge mechanism of the spiral spring has a disadvantage that the workability is reduced because the retrofitting operation of the spiral spring is performed in a narrow trunk, and furthermore, the spiral spring itself has a weak spring force due to its nature, There is also a problem in terms of durability.
[0008]
The hinge mechanism of the tension coil spring is long due to the nature of the tension coil spring, and has a problem that the space in the trunk room is narrowed.
[0009]
The torsion bar hinge mechanism that is frequently used now has a torsion bar extending in the lateral direction of the car between the hinge brackets, so that the torsion bar becomes an obstacle when mounting parts in the trunk. . Recently, a speaker, a car navigation system, and the like are installed in the trunk. However, if the torsion bar extends in the trunk in the lateral direction, a space for mounting the parts is obstructed.
[0010]
In addition, when the torsion bar is attached to the hinge bracket, a twisting moment is generated in the hinge bracket and the hinge member, which also affects the trunk lid itself.Therefore, the hinge bracket itself is designed in consideration of the deformation allowance by the torsion bar and the assembly accuracy. In order to increase the rigidity of the hinge bracket, it is necessary to attach additional components.
[0011]
In particular, the various hinge mechanisms described above do not have a spring member provided on the pivot axis of the trunk lid or become large even if it is provided, and the problem of narrowing the space in the trunk room has not been solved. Moreover, since the spring force of each spring always acts during assembly or cannot be released easily after assembly, it is easy to fine-tune the trunk lid installation by opening and closing the trunk lid multiple times. Can not be done.
[0012]
As a solution to the problem of the space in the trunk room to some extent, there is one disclosed in Japanese Utility Model Laid-Open No. 6-62168. In this hinge mechanism, a spring for reducing the operation force at the time of opening and closing the trunk lid is a torsion coil spring, and a spring force is applied to the hinge bracket via a link. The torsion coil spring is also a pin member. It is arranged around and is advantageous in terms of space.
[0013]
However, since this hinge mechanism uses a torsion coil spring, it is easily affected by heat during the baking of the paint, and a reaction force of the spring acts at the time of assembling. Cannot be done quickly. Further, the above-mentioned fine adjustment is difficult, and there is a problem in terms of workability in mounting.
[0014]
The present invention has been made in order to solve the above-mentioned problems of the prior art, and there is no problem even if painting is performed after mounting a spring, workability such as mounting and fine adjustment is extremely easy, durability is high, and a trunk room is provided. It is an object of the present invention to provide a trunk lid hinge mechanism which can be reduced in size and weight without sacrificing the space of the trunk lid and which is advantageous in cost.
[0015]
[Means for Solving the Problems]
The object of the present invention is achieved by the following means.
[0016]
(1) A first plate member attached to the rotating plate and a second plate member attached to the fixed plate are rotatably connected around a support shaft, and a spring force is applied in a direction to always open the rotating plate. A hinge provided with a spring member coaxially with the support shaft so as to operate, and a spring force control means for preventing the spring force of the spring member from temporarily affecting the opening and closing of the rotary plate. In the mechanism, the spring force control means converts the rotation of the rotation plate into an axial displacement and presses the spring member in the axial direction, and the spring by the rotation of the rotation plate. An idle swing mechanism for avoiding a state in which the member is pressed in the axial direction, wherein the axial direction conversion mechanism is provided between at least a pair of second sleeves provided on the second plate member and the second sleeve. It is arranged and provided in the first plate member Ri has a first sleeve cam surface which is displaced in the axial direction on the end surface is formed, the said cam surface and formed cam surface so as to face the first sleeve, radially outwardly projecting stopper A member provided, a third sleeve coaxially provided on the support shaft together with the first sleeve and the second sleeve, and a slide plate provided on the second plate member so that the stopper member abuts; Wherein the spring member is interposed between the third sleeve and the second sleeve, and the idling mechanism allows the stopper member to pass when the third sleeve rotates. Wherein the notch portion is opened by sliding the slide plate .
[0017]
(2) The hinge mechanism according to (1), wherein the spring force control means has a set lever projecting radially from the third sleeve and setting the third sleeve in an axially displaceable state .
[0018]
(3) The hinge mechanism according to (1) or (2) , wherein the spring force control means includes an extension tool that is detachably provided on the set lever and extends the length of the set lever .
[0019]
(4) The hinge mechanism according to any one of (1) to (3) , wherein the slide plate includes a fixing member that keeps the notch closed .
[0020]
(5) The spring force control means includes: a pin member screwed so as to advance and retreat radially inward from the third sleeve ; and so that the pin member is fitted when screwed. Having a long groove formed in the support shaft, attaching the first plate member and the second plate member to the rotating plate and the fixed plate, and after rotating the rotating plate (1) , the pin member is The hinge mechanism according to (1), wherein the third sleeve is fitted in the long groove so that the third sleeve can move only in the axial direction without rotating with respect to the support shaft .
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0026]
<First embodiment>
FIG. 1 is a perspective view of a hinge mechanism of a trunk lid for an automobile according to a first embodiment of the present invention as viewed from a bottom side, FIG. 2 is an exploded perspective view corresponding to FIG. 1 of the hinge mechanism, and FIG. FIG. 4 is an enlarged sectional view of FIG.
[0027]
The hinge mechanism H of the trunk lid for a vehicle according to the present embodiment is provided on the left and right sides of the vehicle, and connects the trunk lid 1 to a fixed plate 3 such as a par shell provided at the rear of the vehicle body as shown in FIG. It is used in a mounted state.
[0028]
As shown in FIGS. 1 and 2, the hinge mechanism H includes a first plate member P ₁ bolted to an arm 2 provided on a trunk lid 1 and a second plate member P bolted to a fixing plate 3. ₂ , the support shaft 4 for rotatably supporting the two plate members P ₁ and P ₂ , and the hinge mechanism H are attached to the trunk lid 1 and the fixed plate 3, and then the spring force of the spring member 8 is temporarily reduced. And a spring force control means R for preventing the opening and closing of the trunk lid 1 from being affected.
[0029]
The spring force control means R converts a turning force when the trunk lid 1 is opened and closed into an axial displacement, and presses the spring member 8 in the axial direction. A swing mechanism Rb that is not converted to the member 8.
[0030]
Axial converting mechanism Ra is first plate member P ₁ and the second due respectively welded to the plate member P ₂ and the first sleeve 5 provided integrally second sleeve 6a, 6b (reference numeral "6" both second Sleeves 6a and 6b), and a pair of second sleeves 6a and 6b are provided on the second plate member P2 at a predetermined distance.
[0031]
The first sleeve 5 is installed so as to be located between the pair of second sleeves 6a, 6b, and the support shaft 4 is inserted into the first sleeve 5 and the second sleeves 6a, 6b. The outer end surface 5a of the first sleeve 5 is a surface perpendicular to the axis facing the inner end surface 6c of one of the second sleeves 6a, and the inner end side has a cam surface 5b cut off obliquely, Two engagement surfaces 5c are formed at the end of the surface 5b.
[0032]
On the other hand, a third sleeve 7 is provided coaxially adjacent to the first sleeve 5. The third sleeve 7 is also formed on the outer end side thereof with a cam surface 7b cut off obliquely and an engagement surface 7c formed at the end of the cam surface 7b. The engagement surface 7b and the engagement surface 7c face and are in contact with the cam surface 5b and the engagement surface 5c, respectively. The end surface of the third sleeve 7 opposite to the cam surface 7b is an end surface 7a perpendicular to the axis.
[0033]
A spring member 8 is provided between the end surface 7a and the second sleeve 6b, and the two cam surfaces 5b and 7b are brought into contact by the spring force of the spring member 8. However, it is only set in a free state in which no spring force acts, that is, in a free length.
[0034]
The set lever 9 is projected from the third sleeve 7 in a radial direction. The set lever 9 rotates the third sleeve 7 around the support shaft 4 and sets the third sleeve 7 in an axially displaceable state. That is, when the first sleeve 5 rotates, the rotation causes the third sleeve 7 to move and displace in the axial direction of the support shaft 4 via the cam surfaces 5b and 7b, thereby compressing the spring member 8. The third sleeve 7 is set.
[0035]
Preferably, the set lever 9 is short so as not to unnecessarily protrude into the trunk. However, if it is short, the turning operation of the third sleeve 7 is not easy, so that the extension tool 9a is provided detachably, It is more preferable that the set lever 9 be elongated by the extension tool 9a to facilitate the rotation operation.
[0036]
The idling mechanism Rb includes a stopper member 10 protruding from the third sleeve 7 and a second plate member P such that the third sleeve 7 that rotates when the trunk lid 1 is rotated does not press the spring member 8. ₂ through the notch 12.
[0037]
Stopper member 10, which is protruded by a predetermined length S outward from said third sleeve 7, notch 12 is provided at a position of the second plate member P ₂ corresponding to the stopper member 10 but it is opened and closed by sliding the slide plate 13 provided on the second plate member P _2.
[0038]
Here, when the notch 12 is closed by the slide plate 13, the stopper member 10 comes into contact with the slide plate 13 when the third sleeve 7 rotates, and when the trunk lid 1 rotates in this state, When rotating the plate member P ₁ and the first sleeve 5, the third sleeve 7 is moved in the axial direction both cam surfaces 5b, by 7b, will compress the spring member 8. In this case, the stopper member 10 only slides on the slide plate 13.
[0039]
On the other hand, when the slide plate 13 to open the cutout portion 12, since the stopper member 10 during rotation of the third sleeve 7 does not contact the slide plate 13, the first plate member P ₁ and the first sleeve 5 is rotated In this case, the spring member 8 is not compressed, and the so-called swing function is exhibited.
[0040]
The slide plate 13 has been held so as to slide on the second plate member P ₂ by a pair of supporting pieces 14, 14, since it is necessary to hold the closed position, fixed for position fixing A member 15 is provided.
[0041]
As shown in FIG. 4, the fixing member 15 is screwed into a screw hole 16 formed in the slide plate 13, and when the stopper portion 15 a is pressed against the slide plate 13, the distal end portion is connected to the second plate member P ₂ . It is constituted by a screw member 17 fitted into the provided through hole 16a.
[0042]
The support piece 14 may be a cut-and-raised piece formed by cutting and raising the second plate member P2.
[0043]
Next, the operation will be described.
[0044]
First, the hinge mechanism H is attached to the vehicle body. Hitting this installation, a first plate member P ₁ is bolted to the arm 2 of the trunk lid 1, the second plate member P ₂ is bolted to the fixed plate 3.
[0045]
In this case, the slide plate 13 of the spring force control means R is set to a retracted position (a state shown by a two-dot chain line in FIG. 1) in which the notch 12 is not closed.
[0046]
In this state, even if the trunk lid 1 is rotated, the stopper member 10 merely passes through the notch portion 12, the above-mentioned empty swing function is exhibited, the spring member 8 is not compressed, and the trunk member is not affected by the spring force. The lid 1 can be freely rotated.
[0047]
Therefore, for example, when the position of the trunk lid 1 is displaced with respect to the vehicle body, the position of the trunk lid 1 is adjusted or finely adjusted while opening and closing the trunk lid 1 a plurality of times to finish the trunk lid 1 well. This makes it easy to attach the trunk lid 1 to the vehicle body.
[0048]
In this state, paint baking may be performed. Since the spring member 8 is a compression coil spring, it is not long like a spiral spring or a tension coil spring, and the spring member 8 itself is in a free state. Because there are few. In addition, the torsion bar currently used also reduces the thermal effect by selecting the material, and taking into account that the paint baking is performed after assembly, the spring member 8 of the present embodiment is also the same as the torsion bar. Even if it is made of the same material, and the coating is baked after it is assembled to the vehicle body, the performance of the spring member 8 does not substantially deteriorate due to heat.
[0049]
After the hinge mechanism H is assembled to the vehicle body in this manner, the trunk lid 1 is opened from this assembled state, and the spring force of the spring member 8 is set to function as a balancer for reducing the opening / closing operation force of the trunk lid 1. The case of performing the operation will be described. At this point, the slide plate 13 is at the position indicated by the two-dot chain line in FIG. 1 and the notch portion 12 remains open, so that the opening and closing of the trunk lid 1 can be performed without any problem. .
[0050]
In the setting, first, the extension tool 9a is attached to the set lever 9, and an operation of rotating in the direction of arrow A in FIG. 1 is performed. Thereby, the cam surface 7b of the third sleeve 7 moves along the cam surface 5b of the first sleeve 5, and the third sleeve 7 retreats along the axis of the support shaft 4 (to the right in FIG. 1). The spring member 8 is compressed.
[0051]
When the spring member 8 is compressed by a predetermined amount, the position of the stopper 10 substantially coincides with the position of the slide plate 13, so that the slide plate 13 moves forward and the stopper 10 is placed on the slide plate 13. Thereby, the notch 12 is closed and the compressed state of the spring member 8 is maintained. The closing position of the slide plate 13 is fixed by a fixing member 15. In addition, the extension tool 9a is also obstructed, and is pulled out from the set lever 9.
[0052]
As a result, the spring force of the spring member 8 acts on the trunk lid 1 in the open state. Thereafter, descend the trunk lid 1, and back to the closing direction, the first plate member P ₁ and the first sleeve 5 is rotated in the direction of arrow B in FIG. 1, the cam surface 5b of the first sleeve 5, The cam surface 7b of the third sleeve 7 is pressed. In this case, since the spring force of the spring member 8 acts on the third sleeve 7, the lowering of the trunk lid 1 is performed while compressing the spring member 8, that is, under the action of the spring force. become.
[0053]
In this case, the stopper member 10 placed on the slide plate 13 only moves along the upper surface of the slide plate 13 with the movement of the third sleeve 7.
[0054]
As a result, the downward rotation of the trunk lid 1 is performed smoothly while compressing the coil spring member 8. If the force for lowering the trunk lid 1 is released at this time, the trunk lid 1 can be stopped at a position where the spring force of the coil spring member 8 and the moment of its own weight are balanced.
[0055]
<Second embodiment>
FIG. 5 is an enlarged sectional view of a main part of a hinge mechanism of a trunk lid for an automobile according to a second embodiment of the present invention. Members common to those shown in FIGS. Is omitted.
[0056]
The hinge mechanism H of the vehicle trunk lid according to the present embodiment is different from the above-described embodiment in the spring force control means R. As shown in FIG. 5, the spring force control means R of the present embodiment comprises the set lever 9 and the fixing member 15 of the above-described first embodiment using a single pin member 20, thereby providing the first embodiment. The same operation as in the embodiment is performed.
[0057]
The spring force control means R of the present embodiment forms a screw hole 22 in a projecting portion 21 projecting radially from the third sleeve 7, and screws a screw portion 23 of the pin member 20 into the screw hole 22. Thereby, the stopper portion 24 provided near the screw portion 23 is pressed against the projecting portion 21 to fix the pin member 20.
[0058]
On the other hand, a long groove 25 into which the tip end portion 20a of the pin member 20 is fitted is formed in the support shaft 4 so as to extend in the axial direction, and the second sleeve 6a and the second sleeve 6a are fixed so that the support shaft 4 is not rotated. And / or fix by driving a pin into 6b.
[0059]
In this way, after the hinge mechanism H is attached to the vehicle body, when the distal end portion 20a of the pin member 20 is retracted from the long groove 25 (indicated by a two-dot chain line in FIG. 5), the trunk lid 1 is rotated. However, the third sleeve 7 and the pin member 20 are simply rotated by the first sleeve 5 (the arm 2 is rotated within the range indicated by the arrow C in FIG. 5 and the pin member 20 is rotated within the range indicated by the arrow D in FIG. 5). Only in the axial direction, and the spring force of the spring member 8 does not act.
[0060]
On the other hand, after the pin member 20 is screwed in so that the distal end portion 20a is fitted into the long groove 25 (the state shown by the solid line in FIG. 5), the position of the trunk lid 1 is changed from the open position (the position shown by the solid line in FIG. 5). When in the closed position (the position indicated by the two-dot chain line in FIG. 5), the first sleeve 5 also rotates about the support shaft 4, and the cam surface 5b of the first sleeve 5 and the cam surface 7b of the third sleeve 7 are engaged. In some cases, the third sleeve 7 also tries to rotate together with the first sleeve 5.
[0061]
However, since the distal end portion 20a of the pin member 20 is fitted in the long groove 25, the third sleeve 7 remains fitted on the support shaft 4 whose position is fixed, and does not rotate. It is only pushed by the cam surface 5b of the sleeve 5 to move in the axial direction. In this case, the tip portion 20a of the pin member 20 moves in the axial direction along the long groove 25.
[0062]
As a result, the third sleeve 7 retreats (for example, to the right in FIG. 2) along the axis of the support shaft 4, and compresses the spring member 8.
[0063]
Therefore, with the hinge mechanism H attached to the vehicle body and the front end portion 20a of the pin member 20 retracted from the long groove 25, the trunk lid 1 is opened and closed to perform fine adjustment of the trunk lid 1, and thereafter, the pin member 20 is removed. If the screw 20 is screwed and the distal end portion 20a is fitted in the long groove 25, the trunk lid 1 can be opened and closed while compressing the spring member 8 as in the first embodiment.
[0064]
The present invention is not limited to the above-described embodiments, but can be variously modified and used within the scope of the claims. The above-described embodiment is a hinge mechanism for a trunk lid for an automobile. However, the present invention can be used not only in such an embodiment but also as various types of lids, that is, hinge mechanisms for a lid.
[0065]
In the first embodiment, the slide plate 13 is provided with the fixing member 15 for holding the closed state of the notch 12, but if the slide plate 13 is fixed by so-called patching or the like, the fixing member 15 Is not necessarily required.
[0066]
Further, in the above-described embodiment, the pair of cam surfaces 5b and the engagement surfaces 5c are formed symmetrically on the first sleeve 5, and the pair of cam surfaces abutting on the cam surfaces 5b and the engagement surfaces 5c are also formed on the third sleeve 7. Although the engagement surface 7c and the engagement surface 7c are formed symmetrically, the engagement surfaces 5c, 7c formed here are for stably operating the first sleeve 5 and the third sleeve 7.
[0067]
Therefore, when a large force is not applied to the first sleeve 5 and the third sleeve 7, such as when the spring force is weak, there is no need to form the engaging surfaces 5c and 7c, as shown in FIG. It may have only the cam surfaces 5b and 7b formed by slanting the outer end surface.
[0068]
【The invention's effect】
According to the first aspect of the invention, after the hinge mechanism is mounted on the vehicle body, the spring member as the balancer is temporarily prevented from affecting the opening and closing of the rotating plate by the spring force control means. Fine adjustment of the moving plate becomes easy, and the finished product is good.
Further, since the spring force control means is composed of an axial direction converting mechanism for pressing the spring member in the axial direction by the rotating power of the rotating plate and an idling mechanism not converting to the spring member, the rotating plate can be easily rotated. Thus, fine adjustment of the rotating plate becomes easy.
Further, the first sleeve and the third sleeve each having a cam surface displaced in the axial direction are coaxially combined, pressurized by a spring member, and the rotation of the third sleeve is controlled by spring force control means. The sleeve moves in the axial direction, and the spring force of the spring member affects the opening and closing of the rotating plate, so that space such as a trunk room is not sacrificed, fine adjustment after mounting on the vehicle is easy, and painting is performed after mounting the spring. However, there is no problem, and the workability of attaching a spring or the like is extremely simple, the durability is high, and the hinge mechanism is advantageous in cost. In particular, since the hinge mechanism can be reduced in size and has strength, not only is space extremely advantageous, but also the rotating plate itself does not need to be unnecessarily reinforced, and the weight can be reduced.
In addition, since the notch portion is provided in the second plate member and the notch portion is opened and closed by sliding the slide plate, the effect of the spring force at the time of opening and closing the rotating plate is extremely simple. And can be prevented smoothly .
[0072]
According to the second aspect of the present invention, in the spring force control means, the set lever that protrudes in the radial direction is provided on the third sleeve, so that the spring pressure setting operation becomes easy even in a narrow trunk or the like.
[0073]
According to the third aspect of the present invention, since the extension tool for extending the length of the set lever is provided, the set lever does not largely protrude into the trunk or the like , and the spring pressure setting operation is facilitated.
[0074]
According to the fourth aspect of the present invention, since the fixing member for maintaining the closed state of the notch of the slide plate is provided, the rotation stop of the third sleeve is extremely reliable, and the assembling and adjustment of the hinge are facilitated.
[0075]
According to the invention of claim 4 , since the spring member is a coil spring coaxial with the support shaft, it does not sacrifice space such as a trunk room, is easily fine-tuned after mounting on a vehicle, and has no problem even if the spring is pre-attached. Thus, the hinge mechanism is extremely simple, durable, compact, and cost-effective.
[0076]
In the invention of claim 5 , since the spring force control means is constituted by one pin member and a long groove, assembly and adjustment of the hinge are easy, and the structure itself is simple, which is extremely advantageous in cost.

[Brief description of the drawings]
FIG. 1 is a perspective view of a first embodiment of the present invention as viewed from a bottom surface.
FIG. 2 is an exploded perspective view corresponding to FIG. 1 of the hinge mechanism.
FIG. 3 is a schematic sectional view showing an attached state of the hinge mechanism.
FIG. 4 is an enlarged sectional view of FIG. 3;
FIG. 5 is a sectional view showing a second embodiment of the present invention.
FIG. 6 is an exploded perspective view showing another embodiment of the present invention.
[Explanation of symbols]
1: Trunk lid,
3 ... fixed plate,
4 ... support shaft,
5 ... first sleeve,
5b ... cam surface,
6 ... second sleeve,
7 ... third sleeve,
7b: cam surface,
8 ... Spring member,
9 ... Set lever,
9a ... extension tool,
10. Stopper member,
12 ... notch,
13 ... Slide plate,
15 ... fixing member,
20 ... pin member,
25 ... Long groove,
H: hinge mechanism,
P ₁ ... first plate member,
P ₂ ... second plate member,
R: spring force control means,
Ra: axial direction conversion mechanism,
Rb: Empty swing mechanism.

Claims (5)

A first plate member (P1) attached to the rotating plate (1) and a second plate member (P2) attached to the fixed plate (3) are rotatably connected around the support shaft (4), A spring member (8) is provided coaxially with the support shaft (4) so that a spring force acts in a direction in which the rotating plate (1) is always opened, and the spring force of the spring member (8) is temporarily reduced. In a hinge mechanism (H) comprising a spring force control means (R) for not affecting the opening and closing of the rotating plate (1),
The spring force control means (R) converts the rotation of the rotation plate (1) into an axial displacement and presses the spring member (8) in the axial direction, and an axial conversion mechanism (Ra). An idle swing mechanism (Rb) that avoids a state in which the spring member (8) is axially pressed by the rotation of the rotation plate (1),
The axial direction conversion mechanism (Ra),
At least a pair of second sleeves (6) provided on the second plate member (P2),
A first sleeve (5) disposed between the second sleeves (6) and provided on the first plate member (P1), and having a cam surface (5b) displaced in the axial direction on an end face;
A stopper member (10) having a cam surface (7b) formed so as to face the cam surface (5b) of the first sleeve (5), and protruding radially outward; A third sleeve (7) coaxially provided on the support shaft (4) together with a sleeve (5) and a second sleeve (6);
A slide plate (13) provided on the second plate member (P2) so that the stopper member (10) abuts,
The spring member (8) is interposed between the third sleeve (7) and the second sleeve (6),
The idling mechanism (Rb) has a notch (12) in the second plate member (P2) that allows the stopper member (10) to pass when the third sleeve (7) rotates. A hinge mechanism, wherein the notch (12) is opened by sliding the slide plate (13). The spring force control means (R) has a set lever (9) projecting radially from the third sleeve (7) to set the third sleeve (7) in an axially displaceable state. The hinge mechanism according to claim 1, wherein The said spring-force control means (R) is provided in the said set lever (9) so that attachment or detachment is possible, and has an extension tool (9a) which extends the length of the said set lever (9), The characterized by the above-mentioned. Or the hinge mechanism of 2. The hinge mechanism according to any one of claims 1 to 3, wherein the slide plate (13) has a fixing member (15) for maintaining the closed state of the notch (12). The spring force control means (R) includes a pin member (20) screwed so as to advance and retreat radially inward from the third sleeve (7), and the pin member (20) is screwed. A long groove (25) opened in the support shaft (4) so as to fit when the first plate member (P1) and the second plate member (P2) are connected to the rotating plate (1). ) And the fixed plate (3), and after rotating the rotating plate (1), the pin member (20) is fitted into the long groove (25), and the third sleeve (7) is supported by the third sleeve (7). 2. The hinge mechanism according to claim 1, wherein the hinge mechanism can move only in the axial direction without rotating with respect to the shaft.

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