JP2004246161A - Self-standing screen with shock-absorbing mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mechanism of effectively absorbing a shock when a self-standing screen is stored. <P>SOLUTION: In the self-standing screen, a nearly diamond-shaped pantograph is provided in which a pair of upper and lower expanding arms are connected in a stretching state and the upper and lower ends of the arms are connected to an upper connecting member and a base member, respectively, and which expands in a vertical direction through a stretch energizing means. The frame part of the screen is attached to the base member, and the upper end supporting bar is attached to the upper connecting member. Then, the screen expands and contracts in a vertical direction. An extension part is arranged on the upper arm so as to be positioned on the leading end side of the connection part with the upper connecting member. When the pantograph descends and contracts, the leading ends of the upper arm extension parts come into contact with each other before the screen storage position so as to control the contraction movement, and the pantograph can contract with the deformation of the pantograph constituting members in an elastic region from the aforesaid state to the screen storage position. The upper and lower arms connection part is provided with a means for adjusting the swing angle of the upper arm. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to the technology of a projection screen, and more particularly, to a manual lifting / lowering type equipped with a buffer mechanism for reliably and effectively buffering a drop phenomenon that occurs due to a decrease in the extension biasing force of a pantograph when the screen is stored. It relates to the structure of a free-standing screen.
[0002]
[Prior art]
In the field of home screens such as home theaters and the like, various forms are known as prior art. As an example, an intermediate arm having a central portion rotatably cross-connected, a pair of upper and lower arms opposing left and right rotatably connected to upper and lower ends of the intermediate arm, and a base end of the lower arm By a base member rotatably connected to the upper arm and an upper connecting member rotatably connected to the tip of the upper arm, a substantially rhombus is formed in a two-tiered vertically extending and contracting pantograph. Is provided with means for extending and urging the pantograph and maintaining the height, while the frame portion of the screen provided with the take-up and storage mechanism is horizontally mounted on the base member, and the upper support bar of the screen sheet is horizontally mounted on the upper connection member. And a self-standing screen in which a screen sheet is configured to be able to expand and contract together with the pantograph is known (for example, see Patent Document 1). This conventional self-standing screen has a configuration in which the extension biasing means of the pantograph applies a biasing force to draw inwardly to the opposing arm, and the opposing arm of the pantograph and the biasing means are substantially horizontal near the screen storage position. There is a danger that the effective component of the biasing force supporting the own weight in the posture becomes close to zero and drops sharply, and the impact damages the screen.
[0003]
[Patent Document 1]
JP-A-2000-131766 (see page 6, FIG. 1)
[0004]
[Problems to be solved by the invention]
In view of the above situation, the problem to be solved by the present invention is to provide a self-supporting screen with a buffer function for restricting the screen from falling when the upward effective component of the pantograph stretching biasing force approaches zero when the screen is stored. Another object of the present invention is to provide a self-supporting screen having a function of assisting the urging force of the pantograph expansion urging means when the screen is pulled out. Another object of the present invention is to provide a self-supporting screen provided with an adjustment mechanism for reliably operating each of the above functions.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problem, the present invention provides a pair of telescopic arms, which are composed of upper and lower arms that are flexibly connected to each other, and are rotatably connected to upper and lower ends of an upper connecting member and a lower base member. To form a substantially rhombus-shaped pantograph that expands and contracts vertically, and the pantograph is provided with an extension biasing means, while a frame portion of a screen having a winding storage mechanism is provided on the base member, and an upper end support bar is provided on the upper portion. Each is horizontally attached to the connecting member, a self-supporting screen in which the screen sheet is configured to be able to expand and contract together with the pantograph, wherein the pantograph of the screen has a function of restricting shrinkage of the pantograph in front of the screen storage position, In addition, an adjusting means is provided for reliably performing the function.
[0006]
Specifically, the upper arm of the pantograph is provided with an extension extending further forward from the connection portion with the upper connection member, and when the pantograph is lowered and contracted, the extension is provided just before the screen storage position. The ends of the pantographs are in contact with each other, and the contraction operation of the pantograph is regulated. During the period from the level where the ends of the extension parts contact each other to the storage position of the screen, the components of the pantograph can be contracted by being deformed in the elastic range. To be configured.
[0007]
In this case, the amount of elastic deformation of the pantograph components in the left-right direction is set to about three thousandths of the length of the upper or lower arm of the pantograph. When the amount of deformation is set to this level, a moderate buffering action is exhibited without mechanically unreasonable deformation or plastic deformation, and the repulsive force accompanying the elastic deformation assists the urging force of the extension urging means when pulling out the screen. It can also be used as a means of doing.
[0008]
Further, as an adjusting means for reliably exerting the above function, the pantograph has a connecting tool for connecting the upper and lower arms so that the upper and lower arms can be vertically opened and closed and rotatably connected to each other. It is preferable that the connecting part mounting portion at the end of the first arm is provided with an adjusting means for adjusting and fixing the swing angle of the upper arm in the front-rear direction with respect to the lower arm.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments shown in the accompanying drawings, but includes all embodiments satisfying the requirements described in the claims. FIG. 1 is a rear view of a free-standing screen according to an embodiment of the present invention, in which a screen is pulled out. FIG. 2 is an enlarged view showing the stored state of the screen, and FIG. 3 is a perspective view of the screen as viewed obliquely from above. FIG. 4 is an explanatory view of the buffer mechanism of the screen of FIG. 1 and shows a state in which the tips of the upper arm upper ends abut against each other at a position immediately before the screen is stored, and the downward contraction is restricted. 5 is an enlarged partial view of a bending portion of the left arm of the pantograph of the screen of FIG. 1, (a) is a perspective view from the front near the center of the pantograph, (b) is a front view, and (c) is a plan view. Is shown.
[0010]
In the figure, a self-supporting screen 1 has a pair of telescopic arms 20, 30 composed of upper and lower arms 21, 22, and 31, 32, which are connected to each other so as to be able to bend and extend, so that the connecting portions bend right and left outwardly. The upper and lower ends thereof are rotatably connected to the upper connecting member 16 and the base member 6 so as to be opposed to each other to constitute a substantially rhombic pantograph 15 which expands and contracts vertically, and is formed between the lower arms 21 and 31 and the base member 6. Is provided with an extension urging means 40 for the pantograph 15, while the screen main body 2 having a take-up and storage mechanism for the screen sheet 4 therein is horizontally supported by a storage case 37 joined to a lower portion of the base member 6. Then, the central portion of the upper end support bar 5 is horizontally attached to the upper connecting member 16, and the screen sheet 4 expands and contracts together with the pantograph 15 to form the screen sheet 4. And a configuration in which the screen sheet 4 is supported vertically pantograph 15 when Zhang.
[0011]
The extension urging means 40 of the pantograph 15 can rotate the two right and left wires 10, 10, 13, 13, each having one end locked to the base member 6 via the springs 9, 12, at both ends of the base member 6. Each of the two attached pulleys 8, 8, 11, 11 is wound around and turned inward, and the other ends of the pulleys are respectively engaged with the front and rear intermediate portions of the lower arms 21, 31 on the right and left opposite sides. Thereby, the lower arms 21 and 31 of the pantograph 15 are pulled inward each other by the pulling urging force of the springs 9 and 12 acting on the two wires 10, 10, 13 and 13 on the left and right sides, and the pantograph 15 is attached in the extension direction. It has a configuration that vigorously.
[0012]
Next, the structure of each part of the self-supporting screen 1 having the above configuration will be described in more detail. First, the screen main body 2 is a generally known spring roll type screen, and supports a spring roll 3 rotatably supported in a main body frame 2 a, a screen sheet 4 wound around the spring roll 3, and an end of the screen sheet 4. It is composed of an upper end support bar 5 and the like. The spring roll 3 has a function of automatically rewinding when a spring (not shown) incorporated therein urges the roll in the winding direction of the screen sheet 4 and loosens the drawing force of the screen sheet 4. . In addition, both ends of the main body frame 2a are held and fixed to the storage case 37 holding the base member 6 via the screen fixing members 6a, 6a, and the main body frame 2a does not rotate when the screen sheet 4 is pulled out and wound up. The structure is such that only the spring roll 3 rotates.
[0013]
Next, the pantograph 15 has a base member 6 having a bracket 7 whose lower surface is horizontal and vertical at the center, and a pair of right and left having a base end rotatably connected to the bracket 7 and bending portions 23a and 33a in the middle. Of the telescopic arms 20, 30 and an upper connecting member 16 for rotatably connecting the upper ends of the telescopic arms 20, 30. More specifically, the telescopic arms 20 and 30 include connecting tools 21a and 31a integrally attached to upper ends of a pair of left and right lower arms 21 and 31, and a pair of upper arms 22 and 32 respectively. Are connected to the lower ends 22a, 32a by connecting pins 23, 33, and are arranged so as to bend left and right outward. The lower ends 21b and 31b of the lower arms 21 and 31 of the telescopic arms 20 and 30 are rotatably pivoted to the vertical bracket 7 of the base member 6 by connecting pins 24 and 34, respectively. The upper end portions 22b and 32b of the 32 are rotatably connected to the upper end connecting member 16 by connecting pins 25 and 35, respectively, to form a substantially rhombic free-standing pantograph that expands and contracts vertically.
[0014]
The left and right ends of the base member 6 of the pantograph 15 are fixed to the bottom surface of the screen storage case 37. At both ends in the storage case 37, both ends of the main body frame 2a of the screen main body 2 are fixed and supported by fixing members 6a, 6a. The upper connecting member 16 of the pantograph 15 supports the center of the upper end support bar 5 of the screen sheet 4. The pantograph extension urging means 40 is set such that the extension urging force is substantially balanced with the downward force obtained by adding the gravity of the drawn-out screen sheet 4 and the winding urging force of the spring roll 3. The bottom surfaces of the base member 6 and the storage case 37 have a sufficient depth and stability so that the screen sheet 4 is pulled out to the upper end and the screen does not fall when the screen stands upright.
[0015]
Next, the detailed structure of the pantograph extension and urging means 40 will be described. The extension biasing means 40 of the pantograph 15 has two pulleys 8 and 11 arranged at both ends of the base member 6 so as to sandwich the lower arms 21 and 31 back and forth, respectively. The two right and left wires 10, 10, 13, 13 each having one end locked to the other end of each of the biasing springs 9, 12 locked to the portion, are respectively connected to two front and rear pulleys 8, 8, and 11 respectively. , 11 are individually wound around and turned inward, and guided along the front and rear side surfaces of each of the lower arms 21, 31, and the other ends are respectively locked to the front and rear of the lower arm 21, 31 intermediate portion on the opposite side. It is constituted by locking with pins 26 and 36.
[0016]
The self-standing screen 1 is provided with a storage case 37 having a bottom plate joined to both left and right ends of the lower surface of the base member 6. The storage case 37 has a structure having an opening / closing lid 38 on the upper surface of a substantially rectangular parallelepiped box, and is formed in a size that can store the entire pantograph 15 and the screen main body 2 in a folded state. This storage case supports and fixes both ends of the screen main body 2 via fixing members 6a, 6a, and includes fixing means (not shown) for the base member 6 of the pantograph 15. An opening 39 is formed through the opening / closing lid 38 at the center, and the opening 39 corresponds to the position of the handle 17 attached to the upper center of the upper end support bar 5 of the screen.
[0017]
With the above configuration, the self-standing screen 1 opens the cover 38 of the storage case 37 and holds the handle 17 at the upper center of the upper end support bar 5 of the screen and pulls it upward. When the pantograph 15 is extended and the pantograph 15 is extended, and the lifting operation is stopped, the gravity of the extracted screen sheet 4 and the upper end support bar 5 and the total urging force of the screen winding attachment urging mechanism (not shown) become the extension urging means 40. And the screen is held in a vertical position at that height. When the handle 39 is pushed downward during storage, the pantograph 15 contracts and the screen sheet 4 is wound up. Then, the screen is stored in the storage case 37 together with the pantograph, the opening / closing lid 38 is closed, the lock mechanism (not shown) of the opening / closing lid 38 is locked, the handle 17 is pulled out from the opening 39, and the screen is lowered to the hand for transportation. It is possible.
[0018]
In the illustrated free-standing screen 1, the upper end support bar 5 of the screen is attached to the side opposite to the telescopic arms 20 and 30 with respect to the vertical wall of the telescopic arm 20 and 30 connecting part of the upper connecting member 16 of the pantograph 15. Thereby, interference between the upper end support bar 5 and the arm member of the pantograph 15 can be avoided. In other words, the upper end support bar 5 can be attached to the lower position of the upper connecting member 16, and as a function effect, the height when the screen is folded and stored is reduced, the storage case 37 is reduced in size and weight, and the transportation is facilitated and the cost is reduced. Can be lowered.
[0019]
On the other hand, the self-supporting screen 1 regulates the phenomenon that the pantograph 15 is suddenly dropped when the upper and lower arms of the pantograph approach each other horizontally and the upward supporting force of the extension biasing means 40 approaches zero at the position immediately before the storage. A buffer mechanism 41 is provided. The cushioning mechanism 41 includes extension portions 22c and 32c that extend further forward from the positions of the upper end connection pins 25 and 35 that are connected to the upper connection member 16 to the upper end portions 22b and 32b of the upper arms 22 and 32 of the pantograph. When the pantograph is lowered and contracted, the distal ends of the extended portions 22c and 32c abut each other just before the screen storage position, so that the pantograph contraction operation is restricted. Then, the upper end connecting member 16 is forcibly pushed down (in the direction of the arrow in FIG. 4) while the leading ends of the extension portions 22c and 32c come into contact with each other and reach the screen storage position from the level where the contraction operation is restricted. , The pantograph 15 is deformed within the elastic range of its components, causing the pantograph 15 to contract.
[0020]
The amount of deformation of the pantograph in the left-right direction within the elastic range described above is such that the extension of the pantograph is about three thousandths of the length of the upper arm or the lower arm having substantially the same length as the pantograph. The length of 22c, 32c is set. The amount of deformation in which the arms are pushed sideways in the process of lowering and contracting to the storage position after the ends of the arms come into contact with each other differs depending on the arm length, but is specifically about 3 mm when the arm length is about 1 m. Is an appropriate amount. In order to enable this deformation, the mounting holes for the upper end connecting pins 25, 35 of the upper arm upper end portions 22b, 32b are elongated holes elongated in the distal direction. When this amount of deformation is set, the lowering of the arm is restricted about 4 ° to about 5 ° before the storage position, so that an unreasonable deformation or plastic deformation does not occur in the mechanism of the pantograph, and an appropriate buffer action is exhibited. Further, the repulsive force due to the elastic deformation serves as a means for assisting the urging force of the extension urging means of the pantograph when the screen is pulled out.
[0021]
As an adjusting means for reliably exerting the above function, the pantograph pivots the upper and lower arms 21, 22, and 31, 32 upward and downward with respect to the bending and extending portions 23a, 33a of the upper and lower arms via the intermediate connecting pins 23, 33. The angle of the upper arm in the front-rear direction can be corrected at the connecting part to the lower arm 21, 31 which is connected to the lower arm 21, 31 which is pivotally connected (in the example shown, the upper end 21a, 31a above the lower arm 21, 31). Function.
[0022]
Specifically, the connecting members 21a and 31a attached to the distal ends of the left and right lower arms 21 and 31 respectively have the same symmetrical shape, and one of the connecting members 21a is shown in FIG. The connecting member 21a is formed of a groove-shaped member having an outer plate in contact with the outer surface of the distal end of the member of the lower arm 21, and a front and rear side plate facing the front and rear side surfaces of the distal end of the lower arm 21 with a slight gap. A through-hole for mounting an intermediate connecting pin 23 for connecting the upper arm 22 is formed in a front end portion of the front and rear side plates of the connecting tool 21a, and a lower arm is formed in the center of the outer plate of the connecting tool 21a in the groove. A mounting hole for a fulcrum pin 27 that is swingably connected to the distal end of the member of the lower arm 21 is formed through the outer plate and the front and rear side plates near the mounting hole for the fulcrum pin 27. A plurality of screw holes for adjusting screws 28 for holding and fixing from outside are formed respectively.
[0023]
When connecting the lower arm 21 and the upper arm 22, first, the lower end 21 b of the lower arm 21 is connected to the base member 6 by a lower end connecting pin 24 and pivoted. Next, the connecting tool 21a is rotatably connected to the upper arm end 22a by an intermediate connecting pin 23 so as to be rotatably connected thereto. Then, the tip of the member of the lower arm 21 is inserted into the groove of the connecting member 21a, the outer end thereof is brought into contact with the groove bottom of the connecting member 21a, and the fulcrum pin 27 is inserted from the outer surface of the outer plate to the end of the lower arm member. The upper arm 22 to which the connecting tool 21a is attached with the fulcrum 27 as a fulcrum is connected to the lower arm 21 so as to be able to swing forward and backward. Next, an adjusting screw 28 is screwed into each of the screw holes formed in the outer plate and the front and rear side plates near the fulcrum pin 27 of the connecting tool 21a, and the upper and lower arms 22, 21 are kept in a state where they are correctly overlapped with each other. The lower arm 21 is held and fixed to the connector 21a in this state, and integrated. As described above, the telescopic arm 20 is assembled so that the lower arm 21 and the upper arm 22 bend and extend correctly along the same vertical plane along the left-right direction of the base member 6 with each other. Next, the other telescopic arm 30 facing the telescopic arm 20 is assembled in the same procedure as described above.
[0024]
Finally, when the pantograph 15 is formed by connecting the upper connecting member 16 to the distal ends of the telescopic arms 20 and 30, the left and right telescopic arms 20 and 30 can bend and extend along a common vertical plane. Thereby, when the pantograph 15 descends and contracts and reaches the position just before the storage position, the ends of the extended portions 22c and 32c at the upper ends of the upper arms 22 and 32 are correctly opposed to each other and abut, and the descending contraction of the pantograph 15 is regulated. The buffer mechanism 41 can function correctly. Then, when the connection between the upper and lower arms of the pantograph 15 is disturbed during use and the function of the buffer mechanism 41 is reduced, the adjusting screws 28 of the connecting tools 22a and 32a are adjusted in the same manner as described above. With this adjustment, it is possible to correct the buffer mechanism 41 so that it always functions normally.
[0025]
In the above description, the example in which the connecting tools 21a and 31a provided on the bending portions 23a and 33a of the telescopic arms 20 and 30 of the pantograph 15 are attached to the distal ends of the members of the lower arms 21 and 31 has been described as an example. The connecting members 21a, 31a are formed so as to be attachable to the lower ends of the arm members of the upper arms 22, 32 in the same manner as described above, and the intermediate connecting pin mounting holes at the ends of the connecting members 21a, 31a and the lower arm 21, Attach the intermediate connecting pins 23 and 33 together with the intermediate connecting pin mounting holes formed at the tip of the arm member of No. 31 to connect the two, and connect the upper arms 22 and 32 to the lower arms 21 and 31 in the same procedure as described above. A method of adjusting the swing angle before and after and fixing the swing angle may be adopted.
[0026]
In any of the above methods, if the left and right lower arms 21 and 31 do not substantially coincide with each other in a straight line due to a manufacturing error or the like, and a deviation that is difficult to correct remains, the pantograph 15 descends and contracts. Then, the connecting members 21a, 31a are connected to the distal ends of the arm members so that the upper arms 22, 32 are oriented substantially in a straight line with each other in a state where the distal ends of the upper arm extending portions 22c, 32c are in contact with each other just before the storage position. If the mounting adjustment is performed, the buffer function can be exhibited as in the case described above. .
[0027]
【The invention's effect】
The self-standing screen according to the first aspect of the present invention is arranged such that the upper arm of the substantially rhombic pantograph which supports and vertically expands and contracts the screen further from the connecting portion of the upper connecting member which rotatably connects the upper arm. When the pantograph is lowered and contracted, the distal ends of the extended portions come into contact with each other in front of the screen storage position, so that the pantograph contraction operation is regulated, and the distal ends of the extended portions come into contact with each other. From the level set to the screen storage position, the upper end connecting member is forcibly pushed down, and the pantograph is contracted by being deformed within the elastic range of its constituent members. Regulates the screen from falling even when approaches zero. The elastic deformation of the pantograph component functions as a buffering function when the screen is stored, and also has the effect that when the screen is pulled out, the repulsive force associated with the elastic deformation assists the expansion of the pantograph expansion and urging means.
[0028]
By the way, the cushioning function that regulates the drop of the screen and the assisting function of the pantograph extension and urging when the screen is pulled out will not work reliably if the angle of the upper and lower arms of the pantograph in the front-rear direction is slightly out of order. Requires high precision. Therefore, the self-standing screen according to the second aspect of the present invention is a substantially diamond-shaped pantograph that supports the screen and expands and contracts vertically, and a connecting tool that connects the upper and lower arms to the bending and extending connecting portions of the upper and lower arms so as to be able to open and close vertically. The connecting tool includes a fulcrum pin for supporting the upper arm to be able to deflect back and forth with respect to the lower arm, and an adjustable fixing means for restraining and fixing the front and rear deflection of the upper arm. This makes it possible to easily perform error correction and correction at any time during assembly or when necessary, so that the ends of the upper arms of the pantograph are correctly opposed and abutted, and the upper and lower arms are correctly overlapped and folded. In other words, it can be said that this adjustment mechanism plays an important role in reliably exerting the buffering function when the screen is stored and the assisting function when the screen is pulled out.
[Brief description of the drawings]
FIG. 1 shows an embodiment of a self-supporting screen according to the present invention, and is a view of a state in which the screen is pulled out as viewed from the back.
FIG. 2 is an enlarged view showing a state in which the screen of FIG. 1 is stored.
FIG. 3 is a perspective view of the screen of FIG. 1 as viewed obliquely from above.
4 is an explanatory view of the buffer mechanism of the screen in FIG. 1, showing a state in which the tips of the upper ends of the upper arms are in contact with each other at a position immediately before the screen is stored, and the downward contraction is regulated.
5A and 5B are enlarged partial views of a bending portion of a left arm of the pantograph of the screen of FIG. 1, wherein FIG. 5A is a perspective view as viewed from the front near the center of the pantograph, FIG. 5B is a front view, and FIG. Is shown.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Self-supporting screen 2 Screen main body 2a Main body frame 3 Spring roll 4 Screen sheet 5 Upper end support bar 6 Base member 6a Screen fixing member 7 Bracket 8,11 Pulley 8a, 11a Support shaft 9,12 Spring 10,13 Wire 14 Spring locking Member 15 Pantograph 16 Upper end connecting member 17 Handle 20, 30 Telescopic arm 21, 31 Lower arm 21a, 31a Connecting tool (end)
21b, 31b Lower ends 22, 32 Upper arms 22a, 32a Ends 22b, 32b Upper ends 22c, 32c Extensions 23, 33 Intermediate connecting pins 23a, 33a Bending and extending parts 24, 34 Lower connecting pins 25, 35 Upper connecting pins 26, 36 wire locking pin 27 fulcrum pin 28 adjusting screw 37 storage case 38 opening / closing lid 39 opening 40 extension urging means 41 buffer mechanism

Claims (2)

A pair of telescopic arms composed of upper and lower arms that are flexibly connected to each other are opposed to each other, and their upper and lower ends are rotatably connected to an upper connecting member and a lower base member to form a substantially rhombic pantograph that expands and contracts vertically. The pantograph is provided with an extension biasing means, while a frame portion of a screen having a winding storage mechanism is horizontally attached to the base member, and an upper end support bar is horizontally attached to the upper connection member. A self-supporting screen configured to be extendable and retractable together with the pantograph, wherein the upper arm of the pantograph is provided with an extension extending further forward from a connection portion with the upper connection member, and when the pantograph is contracted downward. The front ends of the extension portions come into contact with each other just before the screen storage position, and the contraction operation of the pantograph is regulated. During the cushioning mechanism with self-supporting screens constituting member of the pantograph is in retractable configured by being deformed elastically region ranging from the level in the storage position of the screen. The pantograph includes a connecting member that connects the upper and lower arms so that the upper and lower arms can be opened and closed rotatably up and down, and the connecting device mounting portion at one end of the upper and lower arms, 2. The self-supporting screen with a shock absorbing mechanism according to claim 1, further comprising adjusting means for adjusting and fixing a swing angle of the upper arm with respect to the lower arm in the front-rear direction.

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