JP4192209B2 - Weight balance lifting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a structure widely used for 0A equipment desks, various article shelves, and other various lifting devices in homes, offices, workplaces, etc., maintaining the weight balance of the upper lifting unit and the lower lifting unit, The present invention relates to an elevating device with improved workability so that the operation of ascending and descending can be efficiently performed.
[0002]
[Prior art]
Conventionally, as an elevating shelf device, a spring is generally used between the upper shelf and the base frame to constitute an urging means when ascending, or the upper shelf and the lower shelf are supported by a four-bar parallel rotation mechanism, and both shelves There is an elevating shelf device which constitutes a lever link means between them, maintains a weight balance, and improves operability. For example, in Japanese Patent Nos. 2972797 and 2838687, the above-mentioned four-bar parallel rotation mechanism is used, and a link arm is interposed between the upper shelf and the lower shelf to maintain the balance of weight and facilitate the operation of raising and lowering. It is the device which was made. However, the displacement width of the lifting and lowering tilt of the lower shelf and the like is large, and it is necessary to make a gap with the back wall, and the corresponding displacement width of the tilting of the lifting and lowering portion of the upper shelf and the like is small. It was. In other words, the weight balance lifting device of the upper stage lifting unit cannot increase the displacement width at the time of rising and lowering and cannot vertically move the lower stage lifting unit. In addition, setting the stepped link portion of the lever link arm of the weight balancing means makes the base position of the lower lift unit indefinite and inconvenient in operation.
[0003]
[Problems to be solved by the invention]
Therefore, the invention described in claim 1 of the present invention enables vertical movement by using a panda graph mechanism for the vertically moving means of the lower stage lifting unit, and the connecting part between the lower stage lifting unit and the lever link arm is horizontal. The purpose is to realize a complete vertical up-and-down movement of the lower stage.
[0004]
In addition to the object of the invention described in claim 2, the invention described in claim 2 enables the pivoting portion between the base end portion of the rotary link mechanism that supports the upper ascending portion and the frame to be horizontally movable, and the upper elevating portion. Aiming to further improve the operability by preventing the interference between the bottom of the upper lifting part and the lower lifting part while maintaining the balance with the vertical lifting movement of the lower lifting part while tilting down And
[0005]
The invention according to claim 3 uses a flexible material having strength such as a wire, a chain, etc. for the lever link arm, and sets the connecting portion of the weight balance means in a continuously variable manner in accordance with the lever ratio. Therefore, the base position of the lower lift is always kept constant, and the purpose is to simplify the setting operation.
[0006]
According to a fourth aspect of the present invention, in addition to the object of the first, second, or third aspect of the present invention, an electric motor is provided at a pivot portion between the base end portion of the rotary link mechanism and the frame, and a large lifting device is provided. In this case, it is intended to improve the operability instead of the manual type.
[0007]
According to a fifth aspect of the present invention, an upper stage elevating part is constructed by using a spring having a weight balancing means instead of the lower stage elevating part, so that the weight of the upper stage elevating part tilting up and down can be maintained. The purpose is to eliminate interference.
[0008]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention is an elevating device having a weight balance means, and a rotary link mechanism comprising a frame and a parallel four-bar rotation mechanism or a wound transmission link mechanism. A weight balance that pivots between the base end portion of the rotary link mechanism, supports the upper lift unit on the tilting upper end of the rotary link mechanism, and moves the upper lift unit up and down by tilting the rotary link mechanism. In the lifting device, the frame is configured to be vertically movable with at least a part of the other lifting part as a lower lifting part via a pantograph mechanism, and the lower lifting part is moved from the base end of the rotary link mechanism. The extension link portion and the lever link arm are interposed and suspended in a continuous manner to constitute a weight balance device.
[0009]
Using the pantograph mechanism, the connecting part between the lower lifting part capable of vertical movement and the lever link arm is configured to move horizontally, and the upper lifting part moves up and down and tilts in the reverse direction. Means is provided for moving the connecting portion so that the connecting portion moves horizontally so as to balance the moment of tilting and turning of the connecting position between the extension link arm portion and the lever link arm. .
[0010]
Next, the invention described in claim 2 is made in addition to the invention described in claim 1, but the horizontal portion of the connecting portion between the lower lift unit and the lever link arm according to the invention of claim 1. Instead of moving movement, the pivoting part pivoting between the base end part of the rotary link mechanism and the frame can move horizontally in the tilting direction of the rotary link mechanism so that the extension link part and the lever link arm Means is provided so that the pivoting portion moves so as to balance the moment of tilting and turning at the linked suspension position.
[0011]
Furthermore, in addition to the invention described in claim 1 or 2, the invention described in claim 3
The lever link arm is made of a flexible material with mechanical strength, such as a wire or chain, so that the continuous suspension position between the extension link portion and the lever link arm can be changed steplessly. Thus, there is provided a means for making the base position of the lower lift unit suspended from the lever link arm constant and further facilitating the setting operation of the weight balance.
[0012]
Furthermore, in the invention described in claim 4, in addition to the invention described in claims 1 to 3, an electric motor is installed in a pivot portion that pivots between the rotary link mechanism and the frame, and the rotary link is provided. A mechanism for driving the tilting and swiveling motion of the mechanism to facilitate the raising / lowering operation of the upper and lower lifting / lowering parts is configured.
[0013]
The invention according to claim 5 or 6 uses a spring force as one corresponding to the weight of the lower lifting part, and attaches one end part to a part of the frame and the other end part to a part of the rotary link mechanism. A means for balancing the moment in the direction of rotation by making the movement adjustable is configured.
[0014]
The invention according to claim 5 or 7 uses a spring force as one corresponding to the weight of the lower lifting part, and attaches one end part to a part of the rotary link mechanism and the other end part to a part of the frame. A means for balancing the moment in the direction of rotation by making the movement adjustable is configured.
[0015]
In the invention according to claim 8, both ends are pivotally attached to an auxiliary arm that intersects at right angles to each link arm around each pivotal axis of the front link arm and the rear link arm of the parallel four-bar rotation mechanism. It is characterized in that means connected to the auxiliary stable link arm is used to stabilize the tilting of the rotary link mechanism.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of a weight balance lifting apparatus according to the present invention will be described with reference to FIGS. 1, 2, 3, and 4. In the drawings, the present invention is constituted by a lifting shelf device mounted on a desk such as a table.
[0017]
Reference numeral 100 designates the main shaft 3 at the base end, the upper lifting / lowering shelf support shaft 4 at the upper tilting portion, and the extension link portion 13 at the end of the main shaft 3 toward the axis of the main shaft 3. The rotary link arm is integrally fixed on a straight line, and a pulley 6-a is pivotally attached to the main shaft 3 and a pulley 6-b is pivotally attached to the upper lifting / lowering shelf support shaft 4, and both pulleys 6-a, 6 The rotating link mechanism having the extended link portion 13 is configured by using the winding intermediate node 2 (wire) on -b. The main shaft 3 is pivotally mounted on the slider 7 together with the main shaft bearing 11, and an auxiliary bearing 25 is further mounted on the slider 7, and a pulley 6a is fixed to the slider 7 so as not to rotate, thereby forming a movable structure. . The main shaft bearing 11 and the auxiliary bearing 25 perform horizontal movement from side to side between the upper surface of the horizontal rail 16 fixed to the front column frame 200 and the rear support frame 300 and the lower surface of the upper frame 400 toward the side surface.
[0018]
The pulley 6-b pivoted on the upper lift shelf main shaft 4 is fixed to both ends of the upper lift shelf 1 so as to obtain the same rotation as the upper lift shelf 1, while being pivoted on the main shaft 3. The pulley 6-a is fixed to the slider 7 to be unable to rotate, and when the rotary link mechanism tilts and rises and descends, the upper lifting shelf 1 does not hold the horizontal but simultaneously tilts. Do.
[0019]
The front strut frame 200 and the rear strut frame 300 are respectively fixed at the base end with the base frame 500 and the upper end with the upper frame 400 to form a base frame. The front strut frame 200 and the rear left / right connecting frame 700 are front-facing. The structure which is symmetrical to the left and right is formed and integrated. Further, a part of the base frame 500 and the table top plate 22 are constructed with clamps 23 to form a lifting shelf device for OA equipment.
[0020]
A pantograph roller 20- equipped with pantograph guides 10-b, 10-b on the inner rear side toward the front of the base frames 500, 500 and pivotally attached to the ends of the pantograph links 8-a, 8-a. b, 20-b are fitted in the groove-like rails of the pantograph guides 10-b, 10-b, and the center parts of the pantograph links 8-a, 8-a are connected to the pantographs with the pantograph stop pins 9, 9. The center part of the links 8-b and 8-b is screwed, and the other end part of the pantograph links 8-b and 8-b is directed to the right side surface of the base frame 500 and 500, and the left end part. Pantograph mechanism will be organized.
[0021]
Regarding the relationship between the lower lift shelf 5 and the pantograph mechanism, the pantograph is located at the position of the lower lift shelf that is symmetrical 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 links 8-a and 8-a are pivoted, and the pantograph rollers 20-a and 20-a pivotally attached to the right ends of the pantograph links 8-b and 8-b 5 and is fitted into the pantograph guides 10-a and 10-a installed in the rear part of the lower part 5, so that the lower elevating shelf 5 moves up and down in the vertical direction.
[0022]
The rotation link mechanism and the pantograph mechanism are linked by lever link arms 12 and 12 made of steel wires suspended from the main shafts 3 and 3, and the other end portions of the lever link arms 12 and 12 are connected to the wheel shafts. 18 and 18, the pantograph links 8-a and 8-a are hooked on the coropins 21-b and 21-b which are the support shafts of the pantograph rollers 20-b and 20-b. As shown in FIG. 2, when the rotary link arms 100 and 100 are tilted and lowered, the lever ratio adjusting pins 15 and 15 of the extension link portions 13 and 13 are equally swiveled around the main shaft 3 and lifted. The lever link arms 12, 12 are pulled up vertically, and the roller pins 21-b, 21-b are pulled horizontally by an amount corresponding to the vertical lifting width by the wheel shafts 18, 18. Accordingly, the upper lift shelf 1 is tilted by the link movement of the pantograph links 8-a, 8-a, and 8-b, 8-b, and the lower lift shelf 5 simultaneously rises vertically when it is lowered. .
[0023]
Leverage ratio adjusting pins 15 and 15 are attached to the notched lever ratio adjusting grooves 14 and 14 along the longitudinal direction of the central portion of the extension link parts 13 and 13 and fixed at arbitrary selected positions. The ratio of the distance between the main shafts 3 and 3 and the lever ratio adjusting pins 15 and 15 and the distance between the main shafts 3 and 3 and the upper lift shelf support shafts 4 and 4 is the function of the lever with the main shafts 3 and 3 as fulcrums. None, the load balancing means is configured by moving the lever adjusting pins 15 and 15 along the lever ratio adjusting grooves 14 and 14 and changing the lever ratio.
[0024]
The base ends of the vertical rails 17 and 17 are faced to the front, and the upper part is provided at the center part of the inner base frame and the upper part is provided at the center part of the upper frame, and the lever ratio adjusting pins 15 and 15 are moved up and down. When the upper elevating shelf 1 tilts and descends and reaches 90 degrees as shown in FIG. 2, the distance between the shafts 3 and 3 and the lever ratio adjusting pin in the direction of arrow A The main shafts 3 and 3 are moved rearward by an amount corresponding to the rotation when the main shafts 3 and 3 continue to rotate in the direction of the arrow B and the direction of the arrow C. Meanwhile, the lower lift shelf 5 continues to move upward vertically.
[0025]
The assembly diagram shown in FIG. 3 shows that the main shaft 3 is used as a base end portion of a rotary link mechanism in which the main shaft 3, the rotary link arm 100, and the extension link portion 13 are integrally fixed. 26 is a structure in which the slider 7 having the auxiliary bearing 25 and the main shaft bearing 11 are pivoted. The main shaft bearing 11 and the auxiliary bearing 25 are formed by the upper surface portion of the horizontal rail 16 and the lower surface portion of the upper frame 400. It is a pivot part that is held. Further, a lever adjustment 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. Keep in touch with. As described above, it is shown that the shaft portion of the lever ratio adjusting pin 15 performs the upward and downward movements along the vertical rail 17 while being in contact with each other.
[0026]
The figure shown in FIG. 4 represents the right side surface of the concept of the spring type weight balance raising / lowering apparatus which balances the weight with the upper stage raising / lowering part using the spring of Claims 5 and 6. The lever adjusting pin 15 is moved and installed at an arbitrary position of the extension portion of the front link arm 29, that is, the lever link arm 31, and an arbitrary tension of the spring 27 is installed. The spring can be used in various types such as a spring type, a hydraulic type, a gas pressure type, etc. In this figure, a tension coil spring is used, and one end of the spring 27 is mounted at a fixed position on the upper frame 400 with a fixing screw, and the other end Is attached to the lever adjustment pin 15. The lever ratio adjusting pin 15 is moved up and down along the lever link arm 31 to adjust the tension of the spring 27 which is a tension coil spring. The front link arm 29 rotates about the main shaft 3 counterclockwise, so that the lever link arm 31 also rotates counterclockwise, and the spring 27 is pulled by the adjusted considerable length. When the tension is pulled, the moment of rotation is balanced with the load mounted on the upper portion of the front link arm 29 by the corresponding amount of tension.
[0027]
The diagram shown in FIG. 5 represents the right side of the concept of the means for smoothly stabilizing the rotational movement of the auxiliary stable link arm 32 according to the eighth aspect of the four-bar rotation link mechanism that tilts up and down. The auxiliary stable link arm 32 is pivotally attached by an auxiliary arm pin 34 to an auxiliary arm 33 that intersects the front link arm 29 and the rear link arm 30 at right angles about the main shaft 3. In FIG. 5, two auxiliary stable link arms 32 are used on the upper and lower sides, but one auxiliary link arm 32 may be used in some cases.
[0028]
Although it is an elevating shelf apparatus used for OA equipment or the like having the functions and features as described above, the present invention is not limited to the above-described embodiment, and is widely applied and used for a working elevating apparatus, a care elevating apparatus, and the like. It is something that can be done.
[0029]
【The invention's effect】
As described above, the weight balance lifting apparatus according to the present invention includes the upper stage lifting part supported on the tilting end of the rotation link mechanism by the mounted object mounted on the lower stage lifting part constituting the load balancing apparatus of the rotation link mechanism. By configuring the balance structure and the spring-type weight balance device to achieve the balance structure, the balance can be maintained at the lift position of each lift section.
[0030]
Further, in the structure of the present invention, since the lower lift unit moves vertically up and down, no extra space is required on the back side of the apparatus, and the upper lift unit is tilted and swung up and down toward the operator. Occasionally, the increase in the width eliminated the interference between the lower elevating part and the upper elevating part, and the mobility and operability were improved.
[0031]
Furthermore, by using a material such as a wire or chain for the lever link mechanism, the structure of the load balancing means becomes a stepless type, the base position of the lower lift unit can be made constant, and the load balance setting operation can be performed. It became easier to do.
[Brief description of the drawings]
FIG. 1 is a right side view of an OA equipment desk showing an embodiment of a weight balance lifting apparatus according to the present invention.
FIG. 2 is a right side view showing a case where both lifting shelves are moved.
FIG. 3 is a front view in which the pivoting portion of the rotary link mechanism and the frame of the present invention is assembled.
FIG. 4 is a right side assembly conceptual diagram of the spring-type weight balance lifting apparatus of the present invention.
FIG. 5 is a right side assembly conceptual diagram of an auxiliary stable link arm of the four-bar rotation link mechanism of the present invention.
[Explanation of symbols]
100 Rotating Link Arm 200 Front Strut Frame 300 Rear Strut Frame 400 Upper Frame 500 Base Frame 600 Front Left / Right Linking Frame 700 Rear Left / Right Linking Frame 1 Upper Lifting Rack 2 Wrapping Mediation (Wire Wrapping)
3 Main shaft 4 Upper lift shelf support shaft 5 Lower lift shelf 6-a Pulley 6-b Pulley 7 Slider 8-a Pantograph link 8-b Pantograph link 9 Pantograph stop pin 10-a Pantograph guide 10-b Pantograph guide 11 Spindle bearing 12 Lever link arm (wire)
13 Extension link portion 14 Leverage adjustment groove 15 Leverage ratio adjustment pin 16 Horizontal rail 17 Vertical rail 18 Wheel shaft 19 Handle 20-a Pantograph roller 20-b Pantograph roller 21-a Coropin 21-b Coropin 22 Table top plate 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 Stabilization Link Arm 33 Auxiliary Arm 34 Auxiliary Arm Pin

Claims (2)

A rotating link mechanism base end composed of a parallel four-bar rotation mechanism or a winding transmission type link mechanism that is wound from a fixed start end and fixed at a terminal end is pivoted on the frame, and an upper stage is provided at the tilting end of the rotation link mechanism. The lifting part is supported, and at least a part of the other lifting part is set as a lower lifting part on the frame, and the lower lifting part is suspended in cooperation through the extension link part and the lever link arm of the rotary link mechanism, In the weight balance lifting apparatus having a structure in which the load mounted on the upper lift part and the lower lift part is balanced with the load of the load mounted on the lower lift part and the lower lift part. The up / down moving means of the lower stage lifting / lowering part is composed of a pantograph mechanism, and the connecting part of the lower stage lifting / lowering part and the lever link arm moves up and down the upper stage lifting / lowering part and moves horizontally in the reverse direction of tilting and turning. A mechanism for moving the connecting part so as to balance the moment of tilting and turning of the connecting position of the extension link part and the lever link arm so that the lower lifting part moves vertically. The extension link portion and the lever link arm are configured so that the pivot portion between the base end portion of the rotary link mechanism and the frame can move horizontally in the direction of tilting and swiveling by raising and lowering the upper stage elevating portion. A weight balancing lifting apparatus characterized by comprising means for moving the pivoting portion so as to balance the moment of tilting and turning of the connecting position with the moving position. It is possible to set and fix the connecting portion with the extension link portion at an arbitrary position of the lever link arm by using a bend-free material having wire, chain or mechanical strength for the lever link arm. 2. The weight balanced lifting device according to claim 1, wherein the connecting position is continuously changed and the base position of the lower lifting part is made constant by changing the lever ratio. .

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