JP2004135725A - Foldaway table with turning resistance means - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foldaway table with a turning resistance means, wherein its top plate can be turned between a substantially horizontal working position and a substantially vertical upright position for a short period of time and yet stopped without a shock at the ends of turning such as the working position or the upright position. <P>SOLUTION: The top plate 2 can be turned for a short period of time in either direction from the working position to the upright position and from the upright position to the working position, and yet can be smoothly stopped at the end of turning without a shock by constituting a turning resistance, which is larger in the final phase of turning between an adjacent working position and the working position than in the intermediate phase of turning between the working position and the upright position. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a top plate rotatably mounted between a substantially horizontal use position and a substantially vertical standing position with respect to a support, and a rotation resistance means for applying a resistance to the rotation of the top plate. And a folding table with rotation resistance means.
[0002]
[Prior art]
In this type of folding table, the top plate is pivotally mounted on a support so as to be rotatable between a substantially horizontal use position with respect to the support and a substantially vertical standing position where the top plate can be stored. Gravity acts, and the top board descends. Therefore, the user needs to rotate the top plate while supporting it, and if the top plate is rotated without support, a shock is applied to the strut and the locking device, not only generating a loud impact sound, but also the parts The table could be shortened in service life due to damage.
[0003]
In order to prevent the top plate from lowering rapidly due to gravity without supporting it with the hand, a telescopic gas spring is installed between the top plate and the support column to provide resistance to the rotation of the top plate. The one provided is known (see Patent Document 1). A folding table using a rotary oil damper is also known as another type of applying a resistance to the rotation of the top plate (see Patent Document 2).
[0004]
[Patent Document 1]
JP-A-8-117031 (paragraphs 0016-0018, FIGS. 2 and 5)
[Patent Document 2]
JP-A-10-2111025 (page 1-2, FIG. 1-3)
[0005]
[Problems to be solved by the invention]
By the way, although the thing described in the above-mentioned patent documents 1 and 2 can avoid a rapid collision of a top board, since the resistance to rotation of a top board is constant, from a standing position to a horizontal position where gravity acts. Has the disadvantage that it takes too much time to rotate.
[0006]
The present invention has been made in view of such a situation, and when the top plate is rotated between a substantially horizontal use position and a substantially vertical standing position, the top plate can be moved in a short time, and furthermore, the use position and It is an object of the present invention to provide a folding table with turning resistance means that can be stopped at a turning end in a standing position without applying an impact.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the folding table with the rotation resistance means of the present invention includes a top plate pivotally mounted between a substantially horizontal use position and a substantially vertical standing position with respect to the support, In a folding table provided with a rotation resistance means for applying a resistance to the rotation of the top plate, the rotation resistance means may be used when the top plate is used from a use position or an upright position. It is characterized in that a greater resistance is applied in the final region where the top plate is moved from near the use position to the use position, or from the vicinity of the standing position to the standing position, than in the intermediate region that pivots to the position.
According to this feature, since the turning resistance is reduced in the intermediate region, the turning resistance can be moved in a short time from the use position to the upright position or from the upright position to the use position. On the other hand, since the rotation resistance is large in the final region, the vehicle can be stopped smoothly without applying an impact.
[0008]
In the folding table with the turning resistance means of the present invention, the turning resistance means compares the final area from the vicinity of the standing position to the standing position and the final area from the vicinity of the using position to the using position, It is preferable to apply a greater resistance to the final region on the side where the top board moves in the direction in which gravity is applied.
In this way, since the impact of the movement of the top plate in the direction in which gravity is applied is stronger, the top plate can be smoothly stopped by applying a large rotation resistance in the final region.
[0009]
In the folding table with the rotation resistance means of the present invention, the top plate moves from the use position to the upright position, which is the final region through the initial region and the intermediate region, and moves from the upright position to the initial region and the final region through the intermediate region. In contrast to the movement to a certain use position, the movement on the side of the top plate to which the gravity is not added has an auxiliary resistance means that can apply a smaller resistance to each corresponding movement area. Is preferred.
In this way, when the top plate to which gravity is applied is moved in the opposite direction, the movement is completed in a shorter time.
[0010]
In the folding table with rotation resistance means of the present invention, it is preferable that one of the rotation resistance means is a piston-cylinder damper having one connected to the top plate and the other connected to the support side.
With this configuration, by using the piston-cylinder damper, it can be used in place of a gas spring or an oil damper which is usually used.
[0011]
In the folding table with rotation resistance means of the present invention, the rotation resistance means is constituted by a piston-cylinder damper having one connected to the top plate and the other connected to the support, and the auxiliary resistance means is provided with a piston-cylinder damper. Is preferably a one-way valve provided on the piston.
In this way, by providing the auxiliary resistance means on the piston used in the rotation resistance means, it is possible to finish as a simple component.
[0012]
In the folding table with rotation resistance means according to the present invention, the piston-cylinder damper comprises a cylindrical cylinder and a piston which slides linearly on the inner surface thereof, and the rotation resistance means is provided between two rooms divided by the piston. Preferably, the groove is formed on the inner surface in the axial direction of the cylindrical cylinder.
With this configuration, the movement resistance of the piston that slides linearly can be easily adjusted only by changing the groove width.
[0013]
In the folding table with rotation resistance means according to the present invention, the piston-cylinder damper comprises a cylindrical cylinder having two cylinder chambers and a piston swinging and sliding in each cylinder chamber, and the rotation resistance means is provided by the piston. It is preferable that the groove is formed on the inner surface in the circumferential direction of the cylindrical cylinder communicating between the two divided chambers.
This makes it possible to easily adjust the movement resistance of the oscillating sliding piston simply by changing the groove width.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0015]
1 to 4 show an embodiment of the present invention. FIG. 1A is a front view of a folding table with a turning resistance means, and FIG. 1B is a partially broken view of the folding table with a turning resistance means. FIG. 2 is a cross-sectional view taken along line AA of FIG. 1 (a). FIG. 2 (a) is a side view of a folding table with rotation resistance means in which a top plate is in a vertical state, and FIG. FIG. 3 is a sectional view of a piston-cylinder damper, FIG. 4 (a) is a sectional view taken along line BB of FIG. 3, and FIG. 3 (b) is a sectional view of FIG. FIG. 5 is a sectional view taken along line CC of FIG. 3, FIG. 5C is a sectional view of a piston-cylinder damper in which a one-way valve is incorporated in a piston of the damper, and FIGS. 6A to 6C. FIG. 4 is an explanatory diagram of a state in which the movement resistance of a piston changes in a cylindrical cylinder.
[0016]
In FIG. 1, reference numeral 1 denotes a folding table with rotation resistance means (hereinafter referred to as a folding table). The folding table 1 includes a top plate 2 formed in a substantially horizontally-long rectangular shape, and The pillars 4 and 5 composed of four legs 4a, 4b and 5a and 5b supported by the above, the casters 7 attached to the lower ends of the legs 4a, 4b and 5a and 5b, and the top plate 2 are approximately It comprises a piston-cylinder damper 14 (hereinafter referred to as a damper) as a rotation resistance means for applying a resistance force when rotating between a horizontal use position and a substantially vertical standing position.
[0017]
Specifically, the pillars 4 and 5 have a symmetrical structure, and as shown in FIG. 2, a pair of, for example, hollow tubes are joined to each other to form a vertical column, and the lower part thereof is expanded forward and backward. It is composed of bent legs 4a, 4b (5a, 5b).
[0018]
On the other hand, on the lower surface of the top plate 2, as shown in FIG. 1B, a pair of parallel lateral support frames 8a and 8b facing left and right is connected to the front and rear between the lateral support frames 8a and 8b. A frame member including a front frame 12a and a rear frame 12b is attached.
[0019]
Supporting portions 6 are provided at the upper ends of the pillars 4 and 5, respectively. A middle frame 10 is connected between the supporting portions 6, and a support shaft 15 provided on the rear side of the supporting portions 6 is provided. A substantially middle portion of both lateral support frames 8a and 8b attached to the lower surface of the top plate 2 is pivotally connected to the bottom, and rotatably supports the top plate 2.
[0020]
At both ends of the middle frame 10 in the longitudinal direction and the middle of the front frame 12a, both ends of a damper 14 are pivotably connected. As shown in FIG. 3, the damper 14 includes a cylindrical cylinder 16 and a piston 18 that slides linearly on the inner surface of the cylinder. A rod 20 integrally extending from one side of the piston 18 is liquid-tight from one end of the cylindrical cylinder 16. Protruding outward in the axial direction.
[0021]
As shown in FIG. 6, the other end of the cylindrical cylinder 16 is provided with a fixture 26a connected to the middle of the middle frame 10, and the tip of the rod 20 is attached to the middle of the front frame 12a. 26b is provided.
[0022]
The damper 14 gives resistance to the movement of the piston 18 when an axial load is applied to the other end of the cylindrical cylinder 16 and the tip of the rod 20. As shown in FIG. The two chambers X and Y are divided into left and right, and the inner wall of the cylindrical cylinder 16 is provided with communication grooves 22, 24 and 25 having a predetermined cross-sectional area communicating between the two chambers X and Y.
[0023]
When an axial load is applied to the cylindrical cylinder 16 and the rod 20, the piston 18 tries to move according to the load, but the fluid flowing between the chambers X and Y is limited by the widths of the communication grooves 22, 24 and 25. Therefore, the piston 18 receives a movement resistance according to the width of the communication groove.
[0024]
Specifically, in the cylindrical cylinder 16 according to the present embodiment, a wide groove 22 having a predetermined length is formed on an inner peripheral wall surface in the middle in the axial direction, and a medium width groove 25 is formed on the rod 20 side of the wide groove 22. At the same time, on the cylinder head side of the wide groove 22, a narrow groove 24 longer than the medium width groove 25 is formed on the same axis. The wide groove 22, the medium width groove 25, and the narrow width groove 24 are each formed at a fixed depth, and the portions where the groove widths are changed are connected by a continuous tapered linear inclined portion.
[0025]
Each of the grooves 22, 24, and 25 serving as the communication path may be adjusted by changing the cross-sectional area in order to change the flow rate, and the flow rate is adjusted not only by the change in the groove width but also by the depth. It is also possible.
[0026]
Next, the operation of the damper during the turning operation of the folding table will be described with reference to FIGS.
[0027]
As shown in FIG. 2A, when the top plate 2 is in a substantially vertical upright position when not in use, the damper 14 is in the extended state, and the piston 18 in this state is in the state shown in FIG. ) At the forward end (right end) further advanced from the position shown in FIG.
[0028]
In this upright state, the user places his hand on the upper end of the top plate 2 and rotates clockwise toward the front from O to A in the initial area OA shown in FIG. When moving to the position shown in a), the pressure oil compressed in the chamber X on the cylinder head side of the cylindrical cylinder 16 flows through the medium width groove 25 and flows into the room Y on the rod 20 side. At a moderate resistance.
[0029]
When the top plate 2 further enters the intermediate area AB in FIG. 2A by continuing the downward rotation of the top plate 2, the piston 18 shown in FIG. 6B moves to the cylinder head side, The pressure oil compressed by the piston 18 in the chamber on the cylinder head side flows through the wide groove 22 at a reduced flow rate into the chamber on the rod 20 side, so that the top plate 2 can move at high speed.
[0030]
When the top plate 2 is further rotated downward and the top plate 2 reaches the final area BO 'in FIG. 2A, the top plate 2 is compressed in the cylinder head side room by the piston 18 as shown in FIG. 6C. The compressed oil is rapidly squeezed by the narrow groove 24 and flows into the room Y on the rod 20 side, so that a large resistance force is generated and the impact force is reduced.
[0031]
As described above, when the top plate 2 is moved from the vertical standing position to the horizontal use position, the direction in which the gravity of the top plate 2 is added, the narrow groove 24 is used. When the top plate 2 is in the horizontal position during use, the damper 14 is in a contracted state as shown in FIG. 2B, and the piston 18 in this state is further moved from the position shown in FIG. It is located at the head side end (left end) that has receded.
[0032]
The front end of the top board 2 in this horizontal state is put on the hand and the piston 18 is turned upward in the counterclockwise direction from O to B in the initial area OB shown in FIG. 2), the pressure oil compressed in the chamber on the rod 20 side of the cylindrical cylinder 16 is squeezed through the narrow groove 24 and flows into the chamber on the cylinder head side, whereby the front end of the top plate 2 is moved. A resistance force is generated against an artificial action of lifting from a horizontal state.
[0033]
When the top plate 2 is further rotated upward and the top plate 2 enters the intermediate area BA in FIG. 2B, the piston 18 shown in FIG. The pressurized oil compressed in the room on the side passes through the wide groove 22 and the flow of the squeezed oil flows into the room on the cylinder head side, so that the top board 2 can move at high speed.
[0034]
Next, the top plate 2 is further moved upward, and when the top plate 2 reaches the final area AO ′ in FIG. 2B, the top plate 2 is compressed by the piston 18 in the chamber on the rod 20 side as shown in FIG. The applied pressure oil is further narrowed by the middle width groove 25 and flows into the chamber on the cylinder head side, so that a relatively large resistance force is generated and the impact force is reduced.
[0035]
When the top plate 2 of the folding table 1 configured as described above rotates between a substantially horizontal use position and a substantially vertical upright position, the front end faces upward with respect to the substantially horizontal use position. Although the configuration is such that the front end is turned downward, the front end may be turned downward.
[0036]
In this case, the rotation resistance unit compares the final area from the vicinity of the standing position to the standing position with the final area from the vicinity of the use position to the use position, and adjusts the top plate 2 in the direction to which gravity is applied. It is needless to say that the width of the communication groove is selected so as to give a greater resistance to the final area on the side where the movement is performed.
[0037]
Further, the damper 14 as the rotation resistance means is configured as a cylindrical cylinder 16 in which a piston 18 slides linearly. Although not shown, the damper 14 is configured as a cylindrical cylinder having two cylinder chambers. It is also possible to provide a piston (vane) that swings in each cylinder chamber, and use a groove formed on the inner surface in the circumferential direction of a rotary cylinder that communicates between the two chambers divided by the vane, to serve as rotation resistance means.
[0038]
Therefore, according to the folding table 1 according to the present embodiment, since the intermediate region AB in the damper 14 has an area where the rotational resistance is small, the turning table can be moved from the horizontal use position to the standing position or from the standing position to the use position. It can move in a short time even with movement, and since it has a large turning resistance in the final area, it can be stopped smoothly without impact.
[0039]
Further, the rotation resistance means compares the final area AO 'from the vicinity of the standing position to the standing position with the final area BO' from the vicinity of the using position to the using position, and the direction in which gravity is added. Is configured such that a greater resistance is applied to the final region O'B on the side where the top 2 moves, so that the movement of the top 2 in the direction in which gravity is applied is more favorable. It is possible to add a larger turning resistance.
[0040]
Since the damper of the present invention is a piston-cylinder damper, it can be used in place of a gas spring or an oil damper which is usually used.
[0041]
Next, the auxiliary resistance means will be described with reference to FIG.
[0042]
Reference numeral 14 'shown in FIG. 5 is a damper. The damper 14' has basically the same structure as the damper 14 described in the above embodiment, and the piston 18 has a one-way valve 28 as an auxiliary resistance means. Is incorporated.
[0043]
The one-way valve 28 is configured such that pressure oil on the rod 20 side of the cylindrical cylinder 16 divided by the piston 18 can flow out only to the cylinder head side.
[0044]
Therefore, according to the damper 14 'configured as described above, by providing the one-way valve 28 to the piston, the top plate 2 can be moved from the use position to the upright position as shown in FIG. Since the oil on the rod side can be returned to the cylinder head side not only through the communication grooves 22, 24 and 25 but also through the one-way valve 28, the movement is completed in a shorter time. Conversely, when the top plate 2 is moved from the standing position to the use position, there is no flow passing through the one-way hole valve 28 because the direction of gravity is added, and the resistance in the final area BO 'works sufficiently. It has become.
[0045]
【The invention's effect】
The present invention has the following effects.
[0046]
(A) According to the first aspect of the present invention, since the turning resistance is reduced in the intermediate region, the turning resistance can be shortened in a short time regardless of turning from the use position to the standing position or from the standing position to the use position. It can move, and since the rotation resistance is large in the final area, it can be stopped smoothly without impact.
[0047]
(B) According to the second aspect of the invention, since the impact of the movement of the top plate in the direction in which gravity is applied is stronger than that of the top plate, a large rotational resistance is applied in the final area to smoothly move the top plate. Stop can be realized.
[0048]
(C) According to the invention of claim 3, when the top plate to which gravity is applied is moved in the opposite direction, the movement is completed in a shorter time.
[0049]
(D) According to the invention of claim 4, by using the piston-cylinder damper, it can be used in place of a gas spring or an oil damper which is usually used.
[0050]
(E) According to the invention of claim 5, by providing the auxiliary resistance means on the piston used in the rotation resistance means, it is possible to finish as a simple component.
[0051]
(F) According to the invention of claim 6, the movement resistance of the piston that slides linearly can be easily adjusted only by changing the groove width.
[0052]
(G) According to the invention of claim 7, the movement resistance of the oscillating sliding piston can be easily adjusted only by changing the groove width.
[Brief description of the drawings]
FIGS. 1A and 1B show an embodiment of the present invention, in which FIG. 1A is a front view of a folding table with turning resistance means, and FIG. FIG.
2A is a cross-sectional view taken along the line AA of FIG. 1A, wherein FIG. 2A is a side view of a folding table with a rotation resistance means in which a top plate is in a vertical state, and FIG. It is a side view of the folding table with a certain rotation resistance means.
FIG. 3 is a sectional view of a piston-cylinder damper.
4A is a sectional view taken along line BB of FIG. 3, FIG. 4B is a sectional view taken along line AA of FIG. 3, and FIG. 4C is a sectional view taken along line DD of FIG.
FIG. 5 is a sectional view of a piston-cylinder damper in which a one-way valve is incorporated in a piston of the damper.
FIGS. 6A to 6C are explanatory diagrams of a state in which the movement resistance of a piston changes in a cylindrical cylinder.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Folding table 2 Top plate 4 Pillar 4a, 4b Leg 5a, 5b Leg 6 Support 7 Casters 8a, 8b Horizontal support frame 10 Middle frame 12a Front frame 12b Rear frame 14 Damper (piston cylinder damper)
15 Support shaft 16 Cylindrical cylinder 18 Piston 20 Rod 22 Wide groove 24 Narrow groove 25 Medium width groove 26a, 26b Fitting 28 One-way valve AB, BA Intermediate area OA, OB Initial area BO'AO 'Final area

Claims (7)

A top plate rotatably mounted between a substantially horizontal use position and a substantially vertical standing position with respect to the support, and rotation resistance means for applying a resistance to the rotation of the top plate. In a folding table with rotation resistance means,
The rotation resistance means is arranged such that the top plate is moved from the vicinity of the use position to the use position, or from the vicinity of the upright position to the upright position, rather than an intermediate region in which the top plate is pivotally moved from the use position to the upright position or the upright position to the use position. A folding table with a rotation resistance means, wherein the final area that reaches the end provides greater resistance. The rotation resistance means compares the final area from the vicinity of the upright position to the upright position with the final area from the vicinity of the use position to the use position, and moves the top plate in the direction in which gravity is added. 2. The folding table with turning resistance means according to claim 1, wherein a larger resistance force is applied to the final area on the side of the folding table. Compare the movement of the top plate from the use position to the standing position, which is the final region through the initial region and the intermediate region, and the movement from the standing position to the use region, which is the final region through the initial region and the intermediate region, by gravity. 3. The rotation according to claim 1, wherein the movement of the top plate to which the top is not added has an auxiliary resistance means capable of applying a smaller resistance to each corresponding movement area. Folding table with resistance means. 4. A folding table with a rotation resistance device according to claim 1, wherein the rotation resistance device is a piston cylinder type damper, one of which is connected to a top plate and the other is connected to a support column.
Table. The rotation resistance means is constituted by a piston-cylinder damper, one of which is connected to the top plate and the other is connected to the support, and the auxiliary resistance means is a one-way valve provided on a piston of the piston-cylinder damper. Item 4. A folding table with rotation resistance means according to item 3. The piston-cylinder damper includes a cylindrical cylinder and a piston that slides linearly on the inner surface thereof, and the rotation resistance means is formed on an axial inner surface of the cylindrical cylinder that communicates between two chambers divided by the piston. The folding table with a rotation resistance means according to claim 4 or 5, wherein the folding table is a groove formed. The piston-cylinder damper comprises a cylindrical cylinder having two cylinder chambers and a piston swinging in each cylinder chamber, and the rotation resistance means comprises a cylindrical cylinder communicating between the two chambers divided by the piston. 6. The folding table with rotation resistance means according to claim 4, wherein the groove is formed on the inner surface in the circumferential direction.

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