JP4109079B2 - Folding table with rotation resistance means - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a top plate pivotally mounted between a use position substantially horizontal with respect to the support column and a substantially vertical standing position, and a rotation resistance means for imparting a resistance force 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 the column so that it can be rotated between a use position substantially horizontal with respect to the column and a substantially vertical standing position that can be stored. Gravity acts and the top plate descends. For this reason, the user needs to turn the top plate while supporting it.If the top plate is turned without support, impact will be applied to the struts and locking devices, and not only will a loud impact sound be generated, There was a risk that the service life of the table could be shortened due to damage.
[0003]
And when turning the top plate, in order to avoid the rapid lowering of the top plate due to gravity without supporting it by hand, an extendable gas spring is provided between the top plate and the support column to resist the rotation of the top plate. What was given is known (refer to patent documents 1). In addition, a folding table using a rotating oil damper is also known as another type for imparting 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]
Japanese Patent Laid-Open No. 10-211025 (page 1-2, FIG. 1-3)
[0005]
[Problems to be solved by the invention]
By the way, although the thing of the said patent documents 1 and 2 avoids the rapid collision of a top plate, since the resistance force with respect to rotation of a top plate is constant, from the standing position to the horizontal position where gravity acts It has the disadvantage that it takes too much time to rotate.
[0006]
The present invention has been made in view of such circumstances, and can be moved in a short time when the top plate is rotated between a substantially horizontal use position and a substantially vertical standing position. It is an object of the present invention to provide a folding table with a turning resistance means that can be stopped without applying an impact at a turning end in a standing position.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the folding table with a rotation resistance means of the present invention is a top plate pivotally mounted so as to be rotatable between a substantially horizontal use position and a substantially vertical standing position with respect to the support column, In the folding table with a rotation resistance means provided with a rotation resistance means for applying a resistance force to the rotation of the top plate,
The rotation resistance means is configured such that the top plate moves from the vicinity of the use position to the use position, or from the vicinity of the stand-up position to the stand-up position, rather than the intermediate region in which the top plate rotates from the use position to the stand-up position or from the stand-up position to the use position. The last area that reaches the end gives greater resistance , and the top area where the top plate extends from the vicinity of the standing position to the standing position is compared with the final area from the vicinity of the use position to the use position, and gravity is added. It is characterized in that the resistance is applied in a larger and longer range in the final region on the side where the top plate of the direction becomes the movement .
According to this feature, since the rotation resistance is small in the intermediate region, it can move in a short time with respect to either rotation from the use position to the standing position or from the standing position to the use position. In the final area, the rotational resistance is large, so that it can be smoothly stopped without an impact. In addition, since the impact of the movement of the top plate in the direction in which gravity is applied is more intense, a smooth stop of the top plate can be realized by applying a large rotational resistance in the final region.
[0009]
In the folding table with a rotation resistance means of the present invention, the top plate moves from the use position to the standing position which is the final area through the initial area and the intermediate area, and from the standing position to the final area through the initial area and the intermediate area. Contrast with the movement to a certain use position, the movement on the side that becomes the movement of the top plate to which gravity is not added has auxiliary resistance means that can give a smaller resistance to each corresponding movement area. It is preferable.
In this way, when the movement opposite to the movement of the top plate to which gravity is applied is performed, the movement is completed in a shorter time.
[0010]
In the folding table with rotation resistance means of the present invention, the rotation resistance means is preferably a piston-cylinder damper in which one is connected to the top plate side and the other is connected to the support column side.
If it does in this way, it can replace with the gas spring and oil damper which were normally used by using a piston cylinder type damper, and can use it.
[0011]
In the folding table with rotation resistance means of the present invention, the rotation resistance means is composed of a piston cylinder type damper, one of which is connected to the top plate side and the other of which is connected to the column side, and the auxiliary resistance means is a piston cylinder type damper. It is preferable that it is a one-way valve provided in the piston.
If it does in this way, it can finish as a simple component by providing an auxiliary resistance means in the piston used with a rotation resistance means.
[0012]
In the folding table with rotation resistance means of the present invention, the piston cylinder damper comprises a cylindrical cylinder and a piston that linearly slides on the inner surface thereof, and the rotation resistance means is between two chambers divided by the piston. It is preferable that the groove is formed on the inner surface in the axial direction of the cylindrical cylinder communicating with each other.
In this way, it is possible to easily adjust the movement resistance of the piston that slides linearly only by changing the groove width.
[0013]
In the folding table with rotation resistance means of the present invention, the piston cylinder damper comprises a cylindrical cylinder having two cylinder chambers and a piston that swings and slides in each cylinder chamber, and the rotation resistance means is formed 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 chambers divided into two.
In this way, it is possible to easily adjust the movement resistance of the oscillating piston by simply changing the groove width.
[0014]
DETAILED DESCRIPTION OF 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 a folding table with a turning resistance means. 2 is a cross-sectional view taken along the line AA of FIG. 1A, FIG. 2A is a side view of the folding table with rotation resistance means in which the top plate is in a vertical state, and FIG. FIG. 3 is a sectional view of a piston cylinder type damper, FIG. 4 (a) is a sectional view taken along the line BB of FIG. 3, and FIG. 3 (b) is a sectional view of FIG. CC sectional view, (c) is a DD plane view of FIG. 3, FIG. 5 is a sectional view of a piston-cylinder damper in which a one-way valve is incorporated in the piston of the damper, and (a) to (c) of FIG. These are explanatory drawings of the 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 rectangle, and the top plate 2 in the longitudinal direction. The leg columns 4 and 5 including the four leg portions 4a, 4b and 5a and 5b supported by the above, the casters 7 attached to the lower ends of the leg portions 4a, 4b and 5a and 5b, and the top plate 2 are substantially omitted. It is composed of a piston cylinder type 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 pedestals 4 and 5 have a bilaterally symmetric structure, and as shown in FIG. 2, a pair of, for example, hollow pipes are joined to each other to form a vertical support and the lower part is expanded back and forth. It consists 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. 1 (b), a pair of parallel support frames 8a and 8b parallel to the left and right and the front and rear between the both support frames 8a and 8b are connected. A frame member comprising a front frame 12a and a rear frame 12b is attached.
[0019]
Support portions 6 are provided at the upper ends of the support pillars 4 and 5, respectively, and an intermediate frame 10 is connected between the support portions 6. A support shaft 15 provided on the rear side of the support portions 6 is attached to the support shaft 6. The substantially intermediate part of both lateral support frames 8a and 8b attached to the lower surface of the top plate 2 is pivotally attached to support the top plate 2 so as to be rotatable.
[0020]
Both ends of the damper 14 are pivotally connected to the middle in the longitudinal direction of the middle frame 10 and the middle of the front frame 12a. As shown in FIG. 3, the damper 14 includes a cylindrical cylinder 16 and a piston 18 that linearly slides on the inner surface thereof, and a rod 20 that extends integrally from one side of the piston 18 is liquid-tight from one end of the cylindrical cylinder 16. Projecting outward in the axial direction.
[0021]
As shown in FIG. 6, the other end of the cylindrical cylinder 16 is provided with a fixture 26 a that is connected to the middle of the middle frame 10, and the rod 20 is pivotally attached to the tip of the front frame 12 a at the tip of the rod 20. 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 left and right chambers X and Y are divided into two, 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 groove width of the communication grooves 22, 24, and 25. Therefore, the piston 18 receives movement resistance according to the groove 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 the inner circumferential wall surface in the axial direction, and a medium width groove 25 is formed on the rod 20 side of the wide groove 22. In addition, a narrow groove 24 longer than the medium width groove 25 is formed on the same axis on the cylinder head side of the wide groove 22. The wide groove 22, the medium width groove 25, and the narrow groove 24 are each formed at a constant depth, and the portions where the groove widths are changed are connected by a continuous linear inclined portion having a tapered shape.
[0025]
Each of the grooves 22, 24 and 25 as the communication path may be adjusted by changing the cross-sectional area in order to change the flow rate of the outflow, and the flow rate is adjusted not only by the change in the width of the groove 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 standing position when not in use, the damper 14 is in an extended state, and the piston 18 in this state is shown in FIG. ) At the forward end (right end) further advanced from the position shown in FIG.
[0028]
In this standing state, the piston 18 is moved in the clockwise direction from O to A in the initial region 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 into the chamber Y on the rod 20 side in a flow rate in which the pressure oil is squeezed through the medium width groove 25. A moderate resistance is generated.
[0029]
Further, when the top plate 2 continues to rotate downward and the top plate 2 enters the intermediate region AB of FIG. 2A, the piston 18 shown in FIG. 6B moves to the cylinder head side, Since the pressure oil compressed in the chamber on the cylinder head side by the piston 18 flows into the chamber on the rod 20 side, 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 region BO ′ of FIG. 2A, it is compressed in the chamber on the cylinder head side by the piston 18 as shown in FIG. 6C. Since the pressurized oil is rapidly squeezed by the narrow groove 24 and flows into the room Y on the rod 20 side, a large resistance force is generated and the impact force is alleviated.
[0031]
As described above, when the top plate 2 is moved from the vertical standing position to the horizontal use position, since the gravity of the top plate 2 is applied, the narrow groove 24 is used. When the top plate 2 is in a 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. 6C. Located at the back end (left end) of the head.
[0032]
The piston 18 is moved in the counterclockwise direction from O to B in the initial region OB shown in FIG. 2B by turning the front end of the horizontal top plate 2 in the horizontal state as shown in FIG. ), The compressed 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. Resistance is generated against the artificial action of pulling upward from the 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 pressure oil compressed in the chamber on the side passes through the wide groove 22 and the oil at a flow rate that has been throttled flows into the chamber on the cylinder head side, so that the top plate 2 can move at high speed.
[0034]
Next, the top plate 2 is moved further upward, and when the top plate 2 reaches the final area AO ′ in FIG. 2B, as shown in FIG. 6A, the piston 18 compresses in the chamber on the rod 20 side. Since the compressed oil is further squeezed by the medium width groove 25 and flows into the chamber on the cylinder head side, 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 is rotated between a substantially horizontal use position and a substantially vertical standing position, the front end is directed upward with respect to the substantially horizontal use position. However, it can also be configured to rotate the front end downward.
[0036]
In this case, the rotation resistance means compares the final area from the vicinity of the standing position to the standing position of the top board 2 with the final area from the vicinity of the use position to the use position, and the top board 2 in the direction in which gravity is applied. Of course, the groove width of the communication groove is selected so that a greater resistance is applied to the final region on the side where the movement is performed.
[0037]
The damper 14 serving as the rotation resistance means is configured as a cylindrical cylinder 16 in which the piston 18 slides linearly. Although not particularly illustrated, the damper 14 is configured as a cylindrical cylinder having two cylinder chambers. Pistons (vanes) that oscillate in the cylinder chambers may be provided, and the rotation resistance means may be formed by grooves formed on the inner surface in the circumferential direction of the rotary cylinder that communicates between the two chambers divided by the vanes.
[0038]
Therefore, according to the folding table 1 according to the present embodiment, since the rotation resistance is reduced in the intermediate area AB of the damper 14, it is turned 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 with respect to the movement, and in addition, since the rotational resistance is large in the final region, it can be smoothly stopped without applying an 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 use position to the use position, and the direction in which gravity is applied. Since the greater resistance force is applied to the final area O′B on the side where the top plate 2 is moved, the movement of the top plate 2 in the direction in which gravity is added is more preferable. It becomes possible to add a larger rotational resistance.
[0040]
Since the damper of the present invention is a piston cylinder type damper, it can be used in place of a normally used gas spring or oil damper.
[0041]
Next, the auxiliary resistance means will be described with reference to FIG.
[0042]
Reference numeral 14 'shown in FIG. 5 is a damper, and this damper 14' basically has the same configuration as the damper 14 described in the above embodiment, and a one-way valve 28 serving as auxiliary resistance means on the piston 18. Is incorporated.
[0043]
The one-way valve 28 is configured so that the 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, when the one-way valve 28 is provided on the piston, the top plate 2 is moved from the use position to the standing position as shown in FIG. The rod side oil 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, so that the movement is completed in a shorter time. On the contrary, when the top plate 2 is moved from the standing position to the use position, since it is a direction in which gravity is applied, there is no flow passing through the one-way hole valve 28, and the resistance in the final region BO ′ acts sufficiently. It is like that.
[0045]
【The invention's effect】
The present invention has the following effects.
[0046]
(A) According to the invention of claim 1, since the rotation resistance is small in the intermediate region, it takes a short time to rotate from the use position to the standing position or from the standing position to the use position. In addition, since the rotational resistance is large in the final region, it can be smoothly stopped without applying an impact. In addition, since the impact of the movement of the top plate in the direction in which gravity is applied is more intense, a smooth stop of the top plate can be realized by applying a large rotational resistance in the final region.
[0048]
( B ) According to the invention of claim 2 , when the movement opposite to the movement of the top plate to which gravity is applied is made, the movement is completed in a shorter time.
[0049]
( C ) According to the invention of claim 3, by using the piston-cylinder damper, it can be used in place of a gas spring or an oil damper that is normally used.
[0050]
( D ) According to the invention of claim 4 , by providing the auxiliary resistance means on the piston used in the rotation resistance means, it can be finished as a simple component.
[0051]
( E ) According to the invention of claim 5 , the movement resistance of the linearly sliding piston can be easily adjusted only by changing the groove width.
[0052]
( F ) According to the invention of claim 6 , the movement resistance of the swinging and sliding piston can be easily adjusted only by changing the groove width.
[Brief description of the drawings]
1A and 1B show an embodiment of the present invention, in which FIG. 1A is a front view of a folding table with rotation resistance means, and FIG. 1B is a partially broken view of a folding table with rotation resistance means. FIG.
2A is a cross-sectional view taken along line AA of FIG. 1A, in which FIG. 1A is a side view of a folding table with a rotation resistance means in which the top plate is in a vertical state, and FIG. It is a side view of a folding table with a certain rotation resistance means.
FIG. 3 is a sectional view of a piston cylinder type damper.
4A is a sectional view taken along line BB in FIG. 3, FIG. 4B is a sectional view taken along line AA in FIG. 3, and FIG. 4C is a sectional view taken along line DD in FIG.
FIG. 5 is a sectional view of a piston cylinder type damper in which a one-way valve is incorporated in a piston of the damper.
FIGS. 6A to 6C are explanatory views of a state in which the movement resistance of the piston changes in the cylindrical cylinder.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Folding table 2 Top plate 4 Leg column 4a, 4b Leg part 5a, 5b Leg part 6 Support part 7 Caster 8a, 8b Horizontal support frame 10 Middle frame 12a Front frame 12b Rear frame 14 Damper (piston cylinder type damper)
15 Support shaft 16 Cylindrical cylinder 18 Piston 20 Rod 22 Wide groove 24 Narrow groove 25 Medium width groove 26a, 26b Fixture 28 One-way valve AB, BA Intermediate area OA, OB Initial area BO'AO 'Final area

Claims (6)

A top plate pivotally mounted between a use position substantially horizontal to the support column and a substantially vertical standing position, and a rotation resistance means for imparting a resistance force to the rotation of the top plate. In the folding table with rotation resistance means,
The rotation resistance means is configured such that the top plate moves from the vicinity of the use position to the use position, or from the vicinity of the stand-up position to the stand-up position, rather than the intermediate region in which the top plate rotates from the use position to the stand-up position or from the stand-up position to the use position. The last area that reaches the end gives greater resistance , and the top area where the top plate extends from the vicinity of the standing position to the standing position is compared with the final area from the vicinity of the use position to the use position, and gravity is added. direction of large due towards the final zone of movement become the side of the top plate, and folding with rotational resistance means, characterized in that confer resistance in long range table. The movement of the top plate from the use position through the initial area and the intermediate area to the standing position as the final area is compared with the movement from the standing position through the initial area and the intermediate area to the use position as the final area, and gravity. It found the following movement on the side but the movement of the top plate is not added, rotational resistance means according to claim 1 having an auxiliary resistor means which can impart a smaller resistance force to the movement area thereof to the corresponding Folding table with. The folding table with a rotation resistance means according to claim 1 or 2 , wherein the rotation resistance means is a piston-cylinder damper in which one is connected to the top plate side and the other is connected to the support column side. The folding table with rotation resistance means according to claim 2 , wherein the auxiliary resistance means is a one-way valve provided on a piston of the piston cylinder type damper. The piston-cylinder damper comprises a cylindrical cylinder and a piston that slides linearly on the inner surface thereof, and the rotation resistance means is formed on the inner surface in the axial direction of the cylindrical cylinder that communicates between two chambers divided by the piston. The folding table with rotation resistance means according to claim 3 or 4 , wherein the folding table is a groove. The piston-cylinder damper comprises a cylindrical cylinder having two cylinder chambers and a piston that swings in each cylinder chamber, and the rotation resistance means communicates between the two chambers divided by the piston. The folding table with rotation resistance means according to claim 3 or 4 , wherein the folding table is a groove formed on the inner surface in the circumferential direction.

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