JP2002362899A - Weight balancing lifting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a lower stage lifting shelf 5 to move vertically by enlarging displacement of an upper stage lifting shelf 1 and provide a weight balancing device keeping weight balance by fixing the lower stage lifting shelf 5 and improving operability. SOLUTION: A pantograph mechanism is used for a vertical movement means of the lower stage lifting shelf 5 to enable vertical motion of the lower stage lifting shelf 5. A spring 27 instead of the lower stage lifting shelf 5 is used as another means to balance weight of the upper stage lifting shelf 1. A movement means enabling a pivot part between a base end part of a rotation link mechanism and both strut frames 200, 300 to horizontally move with balancing with a vertical movement of the rotation link mechanism is provided to enlarge inclining revolving width of the upper stage lifting shelf 1. A lever link arm 12 is composed of flexible material such as wire, chain to enable motion mentioned above. Consequently, operability is improved more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure widely used for a desk for 0A equipment, various kinds of shelves, and other various kinds of elevating devices in a home, an office, a work place, and the like. The present invention relates to an elevating device having improved workability so that the lifting and lowering operations can be efficiently performed while maintaining the weight balance of the device.

[0002]

2. Description of the Related Art Heretofore, as a raising / lowering shelf device, a spring is generally used between an upper shelf and a base frame to constitute a biasing means at the time of ascent, and a four-bar parallel rotation mechanism supports an upper shelf and a lower shelf. Then, there is an elevating and lowering rack device which constitutes a lever linking means between both shelves, maintains weight balance, and improves operability. For example, Patent Nos. 2,972,797 and 28,386
No. 87 is an apparatus which uses the above-described four-bar parallel rotation mechanism and interposes a lever link arm between an upper shelf and a lower shelf to maintain the weight balance and facilitate the operation of ascending and descending. However, the displacement width of the upward and downward tilting of the elevating unit such as the lower shelf is large, and it is necessary to increase the gap with the wall behind.
Correspondingly, the displacement width of the downward tilt of the elevating part such as the upper shelf is small. That is, the weight-balanced lifting device of the upper lifting unit cannot increase the displacement width at the time of lifting and lowering and cannot perform the vertical movement of the lower lifting unit. In addition, setting the stepwise linking portion of the lever link arm of the weight balancing means makes the base position of the lower elevating portion indeterminate, which is inconvenient in operation.

[0003]

Therefore, according to the first aspect of the present invention, a vertical movement is made possible by using a pandagraph mechanism as a vertical moving means of the lower elevating section, and further, the lower elevating section is connected to the lower elevating section. An object of the present invention is to realize a complete vertical up-and-down movement of the lower stage ascending and descending by allowing a connecting portion with a lever link arm to move horizontally.

According to a second aspect of the present invention, in addition to the object of the first aspect, a pivoting portion between a base end of a rotary link mechanism for supporting an upper rising portion and a frame can be moved horizontally, The tilting displacement width is made larger while maintaining the balance with the vertical ascent and descent of the lower elevating unit when the upper elevating unit descends and tilts, preventing interference between the bottom of the upper and lower elevating unit and the load on the lower elevating unit. Aim for improvement.

According to a third aspect of the present invention, the lever link arm is made of a flexible and flexible material such as a wire or a chain, and the connecting portion of the weight balancing means is steplessly variable according to the lever ratio. By setting, the base position of the lower elevating unit is always kept constant, and the setting operation is simplified.

According to a fourth aspect of the present invention, in addition to the object of the first, second or third aspect, an electric motor is interposed at a pivot portion between the base end of the rotary link mechanism and the frame, In the case of a large lifting device, the purpose is to improve the operability instead of the manual type.

According to a fifth aspect of the present invention, there is provided a structure in which a spring having a weight balancing means is used in place of the lower elevating unit, so that the weight of the upper elevating unit which tilts up and down can be balanced. An object is to eliminate interference with the upper stage elevating unit.

[0008]

According to one aspect of the present invention, there is provided an elevating device having a weight balancing means, comprising a frame and a parallel four-bar rotating mechanism or a winding mechanism. An upper stage elevating portion is pivotally provided between a base end portion of a rotary link mechanism composed of a transmission type link mechanism, and an upper stage elevating portion is supported on an upper end portion of the rotating link mechanism that tilts. In the weight-balanced lifting device configured to ascend and descend, the frame can be vertically moved vertically with at least a part of another lifting unit as a lower lifting unit via a pantograph mechanism on the frame, and the lower lifting unit is The rotary link mechanism is interlocked with an extension link portion extending from the base end of the rotary link mechanism and a lever link arm, and is suspended to form a weight balancing device.

By using the pantograph mechanism, a connecting portion between the lower elevating portion which can move vertically and the lever link arm can be moved horizontally, and the upper elevating portion moves up and down and tilts. Means are provided such that the connecting portion is horizontally moved in the opposite direction, and the connecting portion is moved so as to balance with a tilting and turning direction moment of the connecting position between the extension link arm portion and the lever link arm. Features.

Next, a second aspect of the present invention is the first aspect.
The invention is made in addition to the invention described in claim 1,
Instead of the horizontal movement of the link between the lower elevating unit and the lever link arm described in the invention, the pivoting unit that pivots between the base end of the rotary link mechanism and the frame tilts the rotary link mechanism. Means for horizontal movement in the direction, and means for moving the pivoting portion so as to balance the tilting and turning direction moment of the interlocking suspension position of the extension link portion and the lever link arm. I do.

Further, the invention according to claim 3 provides the invention according to claim 1.
Or, in addition to the invention described in 2, the lever link arm is made of a mechanically-strength free material such as a wire or a chain, and the linking arm between the extension link portion and the lever link arm is used. The hanging position can be changed steplessly, the base position of the lower elevating portion suspended from the lever link arm is kept constant, and means for setting the weight balance is provided. And

According to a fourth aspect of the present invention, in addition to the first to third aspects, an electric motor is mounted on a pivot portion pivotally provided between the rotary link mechanism and the frame. A means for driving the tilting and swiveling movement of the rotary link mechanism to facilitate the lifting operation of the upper lifting unit and the lower lifting unit is provided.

According to a fifth or sixth aspect of the present invention, one end is attached to a part of the frame and the other end is connected to the rotary link mechanism by using the force of a spring as the weight of the lower elevating section. Means for adjusting the movement through a part thereof to balance the rotational moment.

According to a fifth or seventh aspect of the present invention, one end of the lower link is attached to a part of the rotary link mechanism, and the other end of the lower link is connected to the frame by using the force of a spring. Means for adjusting the movement through a part thereof to balance the rotational moment.

According to an eighth aspect of the present invention, both ends are rotatable about an auxiliary arm which intersects at right angles to each link arm about each pivot axis of the front link arm and the rear link arm of the parallel four-bar rotating mechanism. And means for linking by an auxiliary stable link arm pivotally attached to the rotary link mechanism to stabilize the tilt of the rotary link mechanism.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a weight balancing device according to the present invention will be described below with reference to FIGS. 1, 2, 3 and 4. FIG. In the drawings, the present invention is configured in an elevating rack device mounted on a desk such as a table.

Reference numeral 100 denotes a main shaft 3 at the base end, an upper-lowering shelf support shaft 4 at the upper inclined portion, and an extension link 13 at the end via the main shaft 3 and an axis center of the main shaft 3. , A pulley 6-a is attached to the main shaft 3 and a pulley 6-b is pivotally attached to the upper-lowering shelf support shaft 4. a, 6-
A rotary link mechanism having the extension link portion 13 is formed by using the winding intermediate node 2 (wire) around b. The spindle 3 is provided with a slider 7 together with a spindle bearing 11.
The auxiliary bearing 25 is further mounted on the slider 7, and the pulley 6-a is fixed to the slider 7 so as not to rotate, thereby forming a movable structure. Spindle bearing 1
The first and auxiliary bearings 25 move horizontally from side to side between the upper surface of the horizontal rail 16 fixed to the front support frame 200 and the rear support frame 300 and the lower surface of the upper frame 400.

The pulley 6-b pivotally mounted on the upper-lower rack main shaft 4 is fixed to both ends of the upper-lower rack 1 so that the same rotation as the upper-lower rack 1 can be obtained. The pulley 6-a, which is pivotally mounted on the slider 7, is fixed to the slider 7 so as to be unrotatable. When the rotary link mechanism is tilted to ascend and descend, the upper elevating rack 1 keeps horizontal while simultaneously maintaining the horizontal position. Perform tilting movement.

The front support frame 200 and the rear support frame 300 are fixed at their base ends by a base frame 500 and their upper ends by an upper frame 400 to form base frames.
Front left / right continuous frame 600 and rear left / right connected frame 70
At 0, a symmetrical structure is formed toward the front and integrated. Further, a part of the base frame 500 and the table top plate 22 are erected by the clamps 23 to form a lifting shelf device for OA equipment.

The pantograph guides 10-b, 1 are directed inward and rearward toward the front of the base frames 500, 500.
Equipped with 0-b, pantograph links 8-a, 8-a
Pantograph roller 20-b, 20-
b is inserted into the groove-shaped rails of the pantograph guides 10-b and 10-b, and the pantograph link 8-
a, 8-a are screwed to the center of the pantograph links 8-b, 8-b with the pantograph fixing pins 9, 9, and the other parts of the pantograph links 8-b, 8-b are fixed. The end portion is pivoted to the left end portion toward the right side surface of the base frames 500, 500, and a pantograph mechanism is established.

Regarding the relationship between the lower elevating rack 5 and the pantograph mechanism, the position of the lower elevating rack which is point-symmetric with respect to the pivotal positions of the base frames 500, 500 and the pantograph links 8-b, 8-b. The left ends of the pantograph links 8-a and 8-a are pivotally mounted on the pantograph links.
The above-mentioned pantograph guides 10-a, 10-a equipped with pantograph rollers 20-a, 20-a pivotally attached to the right ends of the links 8-b, 8-b at the rear of the lower elevating shelf 5.
Therefore, the lower elevating shelf 5 vertically moves up and down.

The link between the rotary link mechanism and the pantograph mechanism is established by lever links 12, 12, which are made of steel wires suspended from the spindles 3, 3, and the other ends of the lever links 12, 12, respectively. Wheelset 1
Pantograph link 8-a, 8 through mediation of 8,18
-A of the pantograph rollers 20-b, 20-b, which are supported on the roller pins 21-b, 21-b. As shown in FIG. 2, the rotating link arms 100, 10
0 is tilted and descends when the above extended link portion 13, 1
The lever ratio adjusting pins 15, 15 are pivoted equally around the main shaft 3, lifted, and vertically lift the lever link arms 12, and are horizontally moved by the wheel shafts 18, by an amount corresponding to the vertical lifting width. , The colo pins 21-b and 21-b are pulled. Therefore, the pantograph link 8-a,
Due to the link motion of 8-a, 8-b and 8-b, the upper-stage elevating shelf 1 is tilted, and when descending, the lower-stage elevating shelf 5 is simultaneously vertically raised.

Along the longitudinal direction of the central portion of the extended link portions 13, 13, the cut leverage adjusting grooves 14,
Attach the lever ratio adjusting pins 15 and 15 and fix them at an arbitrary selected position, so that the spindles 3 and 3 and the lever ratio adjusting pins 15 and 15 are fixed.
, And the ratio of the distance between the main shafts 3 and 3 and the upper-stage elevating shelf support shafts 4 and 4 acts as a lever with the main shafts 3 and 3 as fulcrums, and along the lever ratio adjusting grooves 14 and 14. By moving the lever adjusting pins 15, 15 to change the lever ratio, a load balancing means is constituted.

With the base ends of the vertical rails 17, 17 facing the front, the center part of the inner base frame is further provided, and the upper part is provided at the center part of the upper frame.
5 and 15 are allowed to move vertically when they move up and down, and as shown in FIG.
When it descends and reaches 90 degrees, it moves horizontally in the direction of arrow A by the distance between axes 3 and 3 and the lever ratio adjustment pin, and further moves in the direction of arrow B
, And the direction of arrow C, the spindles 3, 3 horizontally move backward by an amount equivalent to the rotation. in the meantime,
The lower elevating rack 5 keeps moving vertically.

The assembly drawing shown in FIG. 3 shows a pulley 6-a and a pulley 6-a using the main shaft 3 at the base end of a rotary link mechanism in which the main shaft 3, the rotary link arm 100 and the extension link 13 are integrally fixed. A bearing pin 26 is fixed, and the slider 7 having the auxiliary bearing 25 and the main shaft bearing 11 are pivotally mounted. The main shaft bearing 11 and the auxiliary bearing 25 are formed on the upper surface of the horizontal rail 16 and the upper frame 400. This is a pivoted portion held by the lower surface. Further, a lever ratio adjusting pin 15 is fixed at an arbitrary position of the lever ratio adjusting groove 14 of the extension link portion 13, and the lever link arm 12 made of a wire is suspended from the main shaft, and the lever ratio adjusting pin 15 And keep in touch. As described above, it is shown that the shaft portion of the leverage adjusting pin 15 vertically moves up and down along the vertical rail 17 while being in contact with the vertical rail 17.

FIG. 4 shows a right side view of the concept of a spring-type weight-balance lifting / lowering device for balancing weight with an upper-stage lifting / lowering unit using a spring according to the fifth and sixth aspects. Front link arm 2
The lever ratio adjusting pin 15 is moved and installed at an arbitrary position on the extension of the lever 9, ie, the lever link arm 31, and an arbitrary tension of the spring 27 is installed. Various types of springs, such as a spring type, a hydraulic type, and a gas pressure type, can be used. In this drawing, a tension coil spring is used, and one end of the spring 27 is attached to a fixed position of the upper frame 400 with a fixing screw, and the other end is used. Is attached to the lever ratio adjusting pin 15. The lever ratio adjusting pin 15 is connected to the lever link arm 31.
To adjust the tension of the spring 27, which is a tension coil spring. Front link arm 29 is main shaft 3
, And thus, on the other hand, the lever link arm 31 also rotates counterclockwise, and the spring 27 is pulled by the adjusted substantial length. By pulling, a considerable amount of the obtained tension balances the rotational moment with the load mounted on the upper part of the front link arm 29.

FIG. 5 shows the right side view of the concept of the means for smoothing and stabilizing the rotational movement in which the auxiliary stabilizing link arm 32 is tilted and raised and lowered by the four-bar rotary link mechanism. The auxiliary stable link arm 32 is
An auxiliary arm 33 that intersects at right angles about the respective main shafts 3 with respect to the rear link arm 9 and the rear link arm 30 is rotatably pivoted by an auxiliary arm pin 34. Although two auxiliary stable link arms 32 are used on the upper and lower sides in FIG. 5, one may be used in some cases.

Although the present invention is not limited to the above-described embodiment, the present invention is not limited to the above-described embodiment, and is widely applied to a work elevating device, a nursing elevating device, and the like. It can also be used.

[0029]

As described above, in the weight balancing elevator according to the present invention, the upper lifting part supported on the tilting end of the rotary link mechanism is connected to the lower lifting part constituting the load balancing apparatus of the rotary link mechanism. A structure that balances with the mounted load,
By configuring the spring-type weight balancing device to have a balancing structure, the balance can be maintained at the lifting position of each lifting unit.

Further, in the structure of the present invention, since the lower elevating unit moves vertically up and down, no extra gap is required on the back side of the apparatus, and the upper elevating unit moves up and down in the direction of the worker. The increased width during the tilting turn eliminates interference between the lower-stage elevating unit and the upper-stage elevating unit, thereby improving operability and operability.

Further, by using a material such as a wire or a chain for the lever link mechanism, the construction of the load balancing means becomes stepless, so that the base position of the lower lifting / lowering portion with respect to the frame can be made constant, and the load balancing can be achieved. The setting operation has become easier.

[Brief description of the drawings]

FIG. 1 is a right side view used for a desk for OA equipment, showing one embodiment of a weight balancing device according to the present invention.

FIG. 2 is a right side view showing the case where both lifting shelves are moved.

FIG. 3 is a front view in which a pivot portion of a rotary link mechanism and a frame according to the present invention is assembled.

FIG. 4 is a conceptual diagram of a right side assembly of the spring-type weight balancing device according to the present invention.

FIG. 5 is a conceptual diagram of the right side assembly of the auxiliary stable link arm of the four-bar rotating link mechanism of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 rotating link arm 200 front support frame 300 rear support frame 400 upper frame 500 base frame 600 front left / right connection frame 700 rear left / right connection frame 1 upper stage elevating shelf 2 winding intermediate node (wire winding) 3 main shaft 4 upper stage elevating shelf support shaft 5 Lower shelf 6-a pulley 6-b pulley 7 slider 8-a pantograph link 8-b pantograph link 9 pantograph fixing pin 10-a pantograph guide 10-b pantograph guide 11 spindle bearing 12 lever link arm ( Wire) 13 extension link portion 14 leverage adjusting groove 15 leverage adjusting pin 16 horizontal rail 17 vertical rail 18 wheel axle 19 handle 20-a pantograph roller 20-b pantograph roller 21-a roller pin 21-b roller pin 22 Table top 23 Clamp 24 Bolt / Nut 25 Auxiliary bearing 26 Bearing pin 27 Spring 28 Spring fixing screw 29 Front link arm 30 Rear link arm 31 Lever link arm 32 Auxiliary stable link arm 33 Auxiliary arm 34 Auxiliary arm pin

Claims (8)

[Claims] 1. A base end of a rotary link mechanism comprising a parallel four-bar rotating mechanism or a winding transmission link mechanism which is wound from a fixed starting end and fixed at an end, and is pivotally mounted on the frame. The upper elevating unit is supported on the tilting end of the link mechanism, and at least a part of the other elevating unit is used as a lower elevating unit on the frame, and the lower elevating unit is provided via an extension link and a lever link arm of the rotary link mechanism. And suspend it,
A weight-balanced lifting / lowering device having a structure in which a load mounted on the upper-stage elevating unit and the upper-stage elevating unit and a load on the lower-stage elevating unit and the mounted on the lower-stage elevating unit balances a rotational moment of a rotary link mechanism. The vertical moving means of the lower elevating unit comprises a pantograph mechanism, and a connecting portion between the lower elevating unit and the lever link arm moves up and down the upper elevating unit so as to be able to horizontally move in the opposite direction of tilting and turning. A means for moving the connecting portion so as to balance the tilting and turning direction moment of the connecting position between the extension link portion and the lever link arm, and a mechanism for vertically moving the lower lifting / lowering portion. Features a weight balance lifting device. 2. The extension link section and the extension link section, wherein a pivot portion between a base end portion of the rotary link mechanism and the frame can move horizontally in a direction of ascending and descending and tilting and turning of the upper step elevating section. 2. The weight-balancing device according to claim 1, wherein the pivoting portion moves so as to balance the moment in the direction of tilting and turning at the position linked to the lever link arm. 3. A connecting portion with the extension link portion is set at an arbitrary position of the lever link arm by using a wire, a chain, or a mechanically flexible material which is free to be bent for the lever link arm, and fixed. And means for changing the linking position and changing the lever ratio so that the base position of the lower elevating unit is constant. The weight-balance raising / lowering device according to claim 1. 4. A structure in which an electric motor is interposed at a pivotal portion between a base end portion of the rotary link mechanism and the frame, and the rotary link mechanism is electrically driven.
4. The weight balanced lifting device according to 2 or 3. 5. A base unit of a rotary link mechanism comprising a parallel four-bar rotating mechanism or a winding transmission type link mechanism which is wound from a fixed starting end and fixed at an end, and is pivotally mounted on the frame. At least one at the tilt end of the link mechanism
And supporting at least one spring between the frame and a part of the rotary link mechanism to reduce a load of the upper lifting unit and a load mounted on the upper lifting unit. 4. A mechanism for balancing a rotational moment of a rotary link mechanism by a force of a spring.
Or the weight balanced lifting device according to 4. 6. At least one end of the spring is mounted on a frame to provide a home position for the spring, and the other end can be adjusted for movement through a part of the rotary link mechanism. 6. The weight-balance lifting device according to claim 5, further comprising means for balancing the rotational moment. 7. At least one end of the spring is mounted on a part of the rotary link mechanism to provide a spring home position, and the other end is moved and adjusted via a part of the frame. 6. A weight-balancing device according to claim 5, further comprising means for balancing the rotational moments. 8. The auxiliary arm which intersects the center of the main axis of the front link arm at right angles to the front link arm of the parallel four-bar rotating mechanism and the center of the main axis of the rear link arm intersects at right angles to the rear link arm. 8. A device according to claim 1, wherein said means is connected to said auxiliary arm by at least one auxiliary stabilizing link arm whose both ends are rotatably pivoted to stabilize the tilting of said rotary link mechanism. A weight-balance lifting device according to claim 1.