JPH06154056A - Balance ascending/descending device - Google Patents

Abstract

PURPOSE:To make the device compact by holding an ascending/descending member in the prescribed balance in the whole range of its ascent and descent, so that it can ascent and descent by small force such as human power, etc., and moreover, so that the balance control can be executed easily in accordance with a variation of a load. CONSTITUTION:An ascending/descending member 3 is supported by a parallel link mechanism 4. In the parallel link mechanism 4, operating members 5a, 5b are provided so as to be turnable forward and backward. In the operating member 5a, a balance control device 8 which can control a position is provided. In the rear part of the ascending/descending member 3, a compression coil spring inside provided tube 6 in which a compression coil spring is contained is racked horizontally. The balance control device 8 and rear end of the compression coil spring are connected with a wire 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a balance lifting device for lifting and lowering a seat of chairs and other chairs, or a table or desk top plate, a drawing table top, and an elevating member such as a bed in a balanced manner. Is.

[0002]

2. Description of the Related Art Conventionally, a gas cylinder device has been used as a balance lifting device for imparting an ascending force to a descending force of an ascending / descending member so as to balance the vertically moving operation with a weak force. There is something.

[0003]

When the above-mentioned conventional balance is used for the lifting device, for example, in a seat chair, there are the following problems.

First, when the gas pressure in the gas cylinder mechanism is set to a certain constant pressure, the balance between the gas pressure that pushes the seat portion directly above and the weight of the seated person depends on the lowered state of the seat portion. Since it is different from the raised state, it was difficult to always move up and down lightly with a slight force of a person regardless of the height of the seat. Further, when the pushing force of the seat portion due to the gas pressure becomes smaller than the weight of the seated person, the seat portion suddenly descends, which is dangerous.

Secondly, in the gas cylinder mechanism, since the spindle of the cylinder expands and contracts, the space occupied by the output mechanism portion becomes large, and the gas cylinder mechanism is installed in the limited space of the seat chair and is compact and practical. Was extremely difficult to design.

Thirdly, when the gas cylinder mechanism is used, the pressure in the cylinder is preset so as to balance with the weight of a specific person, and the fine adjustment is not possible. There is also a problem that it cannot be used by people who are different from each other and the versatility is low.

Further, when the above-mentioned balance lifting device is used as a table top for a table, a table top for a drawing table, or a bed table lifting device, the change in the balance between the ascending and descending positions of the table as described above. Similarly, there are problems such as occurrence of noise, difficulty in fine adjustment of gas pressure, and difficulty in further miniaturization.

In view of the above, the present invention solves the above problems and raises and lowers the seats of chairs and other chairs, tables, table tops, and drawing table tops and beds. The purpose is to propose a balance lifting device that can be used.

[0009]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems. The first invention is that the rear portions of both side frames (2a) and (2b) of the base frame (2) and the lifting member ( Both side frames (3a), (3b) in 3)
Of the base frame (2) on both sides of the frame (2).
a) and (2b) and the front portions of both side frames (3a) and (3b) of the elevating member (3) are connected by front links (18a) and (18b) to form a parallel link mechanism (4). ) And actuating frames (23a), (23b)
And a transmission arm (25a) which is vertically hung integrally with the rear part,
(25b) is provided with actuating members (5a), (5b), and the front portions of the actuating frames (23a), (23b) have one of the front and rear links (17a),
The upper end support shafts (19a) and (19b) of (17b) are rotatably connected to the transmission arms (25a) and (25b).
The lower end support shaft (20) of one of the links (17a) (17b).
a) and (20b) are rotatably connected, and a feed nut (37), a feed screw (40) screwed to the feed nut (37), and the feed screw are attached to the actuation frame (23a) of one actuation member (5a). A balance adjusting device (8) comprising an adjusting handle (45) for rotating the (40) forward and reverse is provided, and a compression coil internal pipe (6) is provided horizontally at the rear part of the elevating member (3), A compression coil spring (33) is provided in the pipe (6) with the one actuating member (5a) side fixed and the other end being extendable and contractible, and the feed nut (37) and the compression coil spring (3) are provided.
The other end of 3) is connected by a wire or a chain (7).

A second aspect of the present invention is a brake device (9) comprising a brake mechanism which is constantly urged to stop the rotation of the actuating member (5a) and a brake release lever (47) which releases the brake mechanism. ) Is added.

[0011]

Operation: Both side frames (2a) of the base frame (2),
(2a) and both side frames (3a) of the lifting member (3),
(3b) and links before and after (17a), (17b), (1
The parallel link mechanism (4) is constituted by 8a) and (18b), and the elevating member (3) ascends and descends in a horizontal posture.

When the actuating members (5a), (5b) are pivoted rearward about the lower support shafts (20a), (20b), the upper support shafts (19a), (19b) move upward. ,
The elevating member (3) is raised in a horizontal posture by the parallel link mechanism (4).

When the actuating members (5a), (5b) are rotated forward, the elevating member (3) descends in a horizontal posture.
Further, when the elevating member (3) is lowered from the raised position, the actuating member (5a) rotates forward and the wire (7) is pulled. This compresses the compression coil spring (33),
The restoring force of the compression coil spring (33) increases.

Therefore, the compression coil spring (3) is proportional to the increase in the moment of force in the downward direction caused by the forward movement of the elevating member (3) as it moves downward.
The return force of 3) also increases. Therefore, by setting the spring constant of the compression coil spring (33) to a predetermined value, both forces can be balanced and the lifting member (3) can be moved up and down with a slight force such as human power.

By rotating the adjusting handle (45) forward and backward to displace the position of the feed nut (37),
The amount of compression of the compression coil spring (33) can be changed to change the lifting force of the elevating member (3).

When the brake device (9) is added, the brake release lever (47) is operated to move the elevating member (3) up and down to stop the elevating member (3) at a desired position. At this time, the brake release lever (47) is not operated and the brake is applied.

[0017]

First, the principle of the present invention will be described with reference to FIG. 7, and then the embodiment shown in FIGS. 1 to 6 in which the present invention is applied to a chair will be described.

First, the principle of producing a constant force will be described with reference to FIG. In the Cartesian coordinates of X and Y shown in FIG. 7, the origin is O, and there is a rod L that rotates with the origin O as a fulcrum. From an arbitrary point A on the Y axis to an arbitrary point B on the rod L.
A wire or chain (hereinafter referred to as a wire) is attached to the bar L so that the rod L is always pulled by the vector BA, and the vector BA that pushes up the point B is parallel to the Y-axis and the origin that acts on the point B. Force vector B toward O
When decomposed into the two forces of O, a parallelogram ACBO is created.

The length of the four sides of this parallelogram ACBO is
Even if the rod L rotates and the angle of the rod changes, it does not change. Therefore, if a tension vector BA having a strength proportional to the length AB of the wire W is constantly applied, the force vector BC parallel to the Y axis that pushes up an arbitrary point B on the rod L is
It is always constant regardless of the change in angle. The above is the principle of creating a constant force.

Next, the principle of adjusting the strength of the above-mentioned constant force will be further described with reference to FIG. 7. The wire W attached to the point B on the rod L is slightly moved in the direction of the origin O, and a new one is added. The wire W is attached to the point D so that the rod L is always pulled by the vector DA, and the vector DA that pushes up the point D is parallel to the Y axis and the origin O applied to the point D.
When it is decomposed into two forces of force vector DO toward, parallelogram AEDO is formed.

In this case, the vector DE also has a constant force,
Comparing this vector DE with the constant force vector BC acting on the point B when the wire W is attached to the point B, the strengths are equal. This is always the same regardless of the position of the wire W on the rod L. However, when the wire W is attached to the point D, the strength of the constant force vector BF parallel to the Y axis acting on the original point B is calculated by multiplying the vector DE by the length between DO and It is the value divided by the length of the interval.

Therefore, as the position of the wire W attached to the rod L becomes closer to the origin O, the momentum of the force acting on the rod L becomes proportionally smaller, so that the Y-axis acting at an arbitrary point B on the rod L becomes smaller. The constant force parallel to is also reduced in proportion. The above is the principle of adjusting the strength of a constant force.

A seat chair constructed using the above principle will be described with reference to FIGS. Reference numeral 1 is a balance lift chair, and the whole is composed of a base frame 2, a seat plate 3 as a lift member, a parallel link mechanism portion 4, and operating members 5a and 5b.
, A compression coil spring internal pipe 6, a wire 7, a balance adjusting device 8, a braking device 9, and a backrest 10.

The base frame 2 is formed by horizontally connecting and joining horizontal frames 2c and 2d to the rear ends of the side frames 2a and 2b having L-shaped cross sections which are provided in parallel to the left and right. There is.

Ball bearing bearing boxes 11a, 11b, 12a and 12b are symmetrically arranged at appropriate positions at the rear end portions of the side frames 2a and 2b and at the central portion thereof, and left and right rear end portions thereof are arranged. The positions of the shaft center lines of the ball bearing bearing boxes 11a and 11b are substantially the same as the left and right ball bearing bearing boxes 12a and 12b.
The position is appropriately higher than the position of the axis center line of.

The seat plate 3 is formed by placing a cushion plate 14 on the seat plate frame 13. The seat plate frame 13 is formed by horizontally connecting and joining the seat plate horizontal frame 3c to the front ends of the seat plate side frames 3a and 3b having L-shaped cross sections which are provided in parallel to the left and right.

Ball bearing bearing boxes 15a, 15b, 16a, 16b are symmetrically arranged at appropriate positions at substantially central portions and front end portions of the seat plate side frames 3a, 3b, and at substantially central portions thereof. The positions of the shaft center lines of the left and right ball bearing bearing boxes 15a and 15b are the left and right ball bearing bearing boxes 16a and 1 at the front ends thereof.
It is appropriately higher than the position of the axis center line of 6b.

The upper and lower ends of the pair of left and right parallel links 17a, 17b, 18a, 18b constituting the parallel link mechanism section 4 have support shafts 19a, 19b, respectively at both ends.
The support shaft rods 19, 20, 21, and 22 projectingly provided with 20a, 20b, 21a, 21b, 22a, and 22b are laterally joined and joined.

The support shaft 20 of the support shaft rods 20, 22 at the lower end thereof
a, 20b, 22a and 22b are ball bearing bearing boxes 11a, 11b, 12a and 12b of the base frame 2.
Are rotatably supported by ball bearings, respectively, and support shafts 19a, 19 of support shaft rods 19, 21 at the upper ends thereof are supported.
b, 21a and 21b are mounted on the ball bearing bearing boxes 15a, 15b, 16a and 16b of the seat plate frame 13,
Each is rotatably supported via a ball bearing.

As shown in the drawing, the pair of left and right actuating members 5a and 5b are provided with transmission arms 25a and 25b integrally provided at the rear portions of the actuating frames 23a and 23b, respectively.
Armrest plates 24a and 24b are provided on the upper edges of a and 23b.

Further, shaft holes 23c and 23d are formed in front portions of the operation frames 23a and 23b, and shaft holes 25c and 25d are formed in lower portions of the transmission arms 25a and 25b. The armrest plates 24a, 24b are formed in an arc shape centered on the shaft holes 23c, 23d.

The one actuating member 5a is rotatably fitted in the shaft hole 23c of the actuating frame 23a to the support shaft 19a of the rear upper support shaft rod 19 protruding from the ball bearing bearing box 15a. Further, the shaft hole 25c of the transmission arm 25a is formed in the bearing box 11a for the ball bearing.
It is provided by being rotatably fitted to the support shaft 20a of the rear lower support shaft rod 20 which protrudes from this, and the operating member 5a can be rotated in the front-back direction about the shaft hole 25c of the transmission arm 25a. Thus, the parallel link mechanism 4 is operated.

The other actuating member 5b is also provided on the support shafts 19b and 20b. The compression coil spring internal pipe 6 is provided laterally along with the backrest 10 at the rear ends of the left and right seat plate side frames 3a and 3b. An outer frame pipe 26 which is an outer frame of the compression coil spring inner pipe 6.
As shown in FIG. 4, one end is closed, and a free pulley main body 27 is attached inside the open end of the outer frame pipe 26.

In the free pulley main body 27, a pulley 28 is pivotally attached to a bifurcated tip end portion of a support yoke 29 via a ball bearing by a shaft 30, and a rotary shaft 31 vertically installed at the base of the support yoke 29 is received in a bearing box 32. Is rotatably supported by a ball bearing.

One end of a compression coil spring 33 slidably inserted inside the outer frame pipe 26 is received and fixed by a spring receiver 34 provided in a bearing box 32, and the compression coil spring 3
A spring receiving lid 35 that slides inside the outer frame pipe 26 is attached to the other end of the spring 3. One end of the wire 7 is attached to the spring receiving lid 35, and the wire 7 is dipped inside the compression coil spring 33 to support the yoke 29 and the rotating shaft 31.
Pull out to the outside through a loose hole that penetrates the shaft center of
It is bent at a right angle through 8.

Next, the balance adjusting device will be described.
As shown in FIG. 1, the balance adjusting device 8 is fixed to the actuating frame 23a in a radial direction centered on the shaft hole 23c, and the structure thereof will be described in detail with reference to FIG.

Reference numerals 39a and 39b denote support plates which are arranged in parallel at a predetermined interval and are connected to each other, and one of the support plates 39b is fixed to the operation frame 23a. Each of these upper surfaces is formed as a smooth rail surface.

42 is one end side of one support plate 39b (see FIG. 1).
The bearing is fixed to the lower end side in the attached state). 40 is a feed screw whose axial center is the above-mentioned both support plates 39.
a, 39b at the middle upper part and both support plates 39a, 39b
Are arranged in parallel with each other, and the base end shaft portion 41 thereof is rotatably supported by the bearing 42.

Reference numeral 43 is a bevel gear fixed to the feed screw 40. Reference numeral 45 is an adjustment handle, and 46 is a support shaft to which the handle is fixed. The support shaft 46 is rotatable with respect to the bearing 42 so that the shaft center line of the support shaft 40 and the shaft center line of the feed screw 40 are orthogonal to each other. It is equipped.

Reference numeral 44 denotes a bevel gear fixed to the adjusting handle 45, and meshes with the bevel gear 43 on the side of the feed screw 40. Reference numeral 37 is a feed nut screwed to the feed screw 40.

Reference numerals 38a and 38b denote spindles projecting from both sides of the feed nut 37, and the axis center lines thereof are set so as to be orthogonal to the axis center line of the feed screw 40. Reference numeral 36 denotes a wire attachment tool, the upper part of which is bifurcated, and both leg portions thereof are rotatably connected to the both support shafts 38a and 38b. Further, the other end of the wire 7 protruding from the compression coil spring internal pipe 6 to the outside is fixed to the lower surface.

Ball bearings 38c, 38d are provided on the support shafts 38a, 38b protruding outwardly from both legs of the wire fitting 36, and their outer rings are placed on the rail surfaces of the support plates 39a, 39b. It is supported and can roll in the plate direction.

The mounting position of the wire 7 with respect to the wire mounting device 36 is determined by the intersection of the axial center line of the feed screw 40 and the axial center lines of both the support shafts 38a and 38b, and the axial center line of the compression coil spring internal pipe 6. It is determined that the axis center line of the wire 7 is aligned with the line connecting and.

In the balance adjusting device 8, as viewed from the side of the seat, the extension line of the shaft center line of the feed screw 40 intersects with the shaft hole 23c of the actuating frame 23a, and moreover, the shaft center line of the feed screw 40. Extension line and compression coil spring internal pipe 6
The angle θ between the midpoint and the line segment connecting the support shaft 19a of the actuating frame 23a is defined by the vertical line and the parallel links 17a, 17
It is attached to the operating frame 23a so as to match the angle θ formed by b, 18a and 18b.

The brake device 9 will be described in detail with reference to FIG.
Reference numeral 47 is a brake release lever, which has a hole formed at the rear end thereof on the operation frame 23b below the front of the armrest plate 24b.
It is pivotally attached by 8.

A brake wheel 54 is coaxially fixed to the ball bearing bearing box 15b. 50 is the handle of the brake, the rear end of which is the shaft 51 on the frame 23b.
And a brake piece 52 is fixed to the lower part of the front end of the brake shaft 52. The brake piece 52 is constantly pressed against the outer circumference of the brake wheel 54 by a spring 53 attached to the shaft 51 of the brake handle 50. Is urged to. Reference numeral 49 is a pull rod, the upper end of which is connected to a hole provided at substantially the center of the brake release lever 47, and the lower end of which is connected to a hole provided at the front of the brake handle 50. By moving upward, the brake piece 52 is separated from the brake wheel 54.

The links 17a and 17b and the feed screw 40 correspond to the rod L in the principle diagram 7, and the wire 7 corresponds to the wire W in the principle diagram 7. Next, the operation of this embodiment will be described.

Now, when the user sits on the seat plate 3 in the high sitting posture of FIG. 1, the load applied to the seat plate 3 acts on the wire 7 via the parallel link mechanism portion 4 and the operating frame 23a, and acts on the wire 7. The external tension pulls the spring receiving lid 35 of the compression coil spring internal pipe 6, and compresses the compression coil spring 33 fixed by receiving one end with the spring receiver 34.
As a result, a drag acts on the external tension.

When the seat plate 3 is lowered in the seated state from this high sitting posture, the links in the parallel link mechanism 4 of the seat plate 3 are lower end support shafts 20a, 20b and 22a, 2a.
By rotating forward about 2b, it moves down and descends, and becomes the seat chair state of FIG.

When the seat plate 3 moves downward, the moment acting on the link becomes larger as it moves further away from the support shafts 20a and 20b, which are the fulcrums of the seat plate 3.

Further, since the balance adjusting device 8 moves forward at the same time as the seat plate 3 moves forward by lowering the seat plate 3, the compression coil spring 33 is compressed via the wire 7. The amount of compression of the compression coil spring 33 increases in proportion to the amount of downward and forward movement of the seat plate 3.

Therefore, the compression coil spring 33 is proportional to the increase or decrease of the moment acting on the seat plate 3 in the downward direction.
The pulling force of the wire, that is, the load that pushes up the seat plate in the upward direction increases or decreases, and the seat plate 3 can be balanced over the entire range from the raised position to the lowered position.

Next, when the adjusting handle 45 is rotated to rotate the feed screw 40 in the forward direction to move the feed nut 37 to the side of the support shaft 19a, the wire 7 causes the compression coil spring internal pipe 6 to move.
The coil spring 3 is pulled in the direction
The amount of compression of No. 3 increases, and the pulling force of the compression coil spring 33 increases.

When the adjusting handle 45 is reversely rotated and the feed screw 40 is reversely rotated, the compression amount of the compression coil spring 33 is reduced, and the pulling force of the compression coil spring 33 is reduced.

Therefore, when a heavy person sits down, the adjustment handle 45 is rotated forward, and when a light weight person sits down, the adjustment handle 45 is reversed to correspond to the weight of the seated person. The balance can be achieved and the adjustment can be performed steplessly.

When the seat plate 3 is moved up and down, the brake release lever 57 is gripped and the brake piece 52 is separated from the brake wheel 54. And the seat plate 3
If the brake release lever 47 is released at that position, the brake piece 52 is pressed against the brake wheel 54 by the urging force of the spring 53, and the seat plate 3 is immediately stopped to stop the brake release lever 47 at the desired height position. Can be stationary in position.

FIG. 8 shows an embodiment in which the balance elevating device of the present invention is applied to elevating the top plate of a table. In FIG. 8, 101 is a top plate that is an elevating member, and a fixed frame 102 is fixed to the lower surface of the top plate 101.

Four columns 103 are vertically installed at four corners of the fixed frame 102, and side frames 104 and 105 and front and rear frames 106 and 107 are provided between lower ends of these columns.
Are laid horizontally and joined.

The side frames 104 and 105 correspond to the seat plate side frames 3a and 3b in the above embodiment,
The front horizontal frame 106 corresponds to the seat plate horizontal frame 3c in the above embodiment.

The parallel link mechanism 4, the actuating members 5a and 5b, the compression coil spring inner pipe 6, the wire 7, the balance adjusting device 8 and the brake device 9 in the above-mentioned embodiment are similarly attached. The structure is the same as above.

Incidentally, the backrest 10 and the armrest plate 24 described above.
Since a and 24b are unnecessary, they are not attached. Further, reference numeral 108 is a grip for a brake provided on the actuation frame 23a. Reference numeral 109 denotes a brake release lever similar to the brake release lever 47 of the above-described embodiment. Like a brake lever of a bicycle, by gripping this together with the grip 108 by hand, the handle 5 of the brake can be obtained in the same manner as described above.
It is designed to move above zero. The brake mechanism is located on the inner surface side of the actuating frame 23a and is not shown in the figure.

Members having the same functions as those of the seat chair according to the embodiment are designated by the same reference numerals and the description thereof will be omitted. In this embodiment of the table, the top plate 101 can be moved up and down with the same balance as in the above embodiment by gripping the grip 108 and rotating the actuating frame 23a in the front-rear direction. It is similar to the embodiment.

Further, by adjusting the balance adjusting device 8 in the same manner as in the above-described embodiment, depending on the magnitude of the load of the object placed on the top plate 101, it is possible to achieve a balance corresponding to the load. it can.

In both of the above embodiments, the operating members 5a,
5b to the support shafts 19 at the upper and lower ends of the rear links 17a and 17b.
a, 19b, 20a, 20b are provided, but the operating members 5a, 5b may be provided, connected to the support shafts 21a, 21b, 22a, 22b at the upper and lower ends of the front links 18a, 18b. The same action and effect can be exhibited by.

Further, the present invention can be applied to a normal chair or a reception chair from the embodiment of the sitting chair, and by analogy with the embodiment of the table, a desk such as a learning desk or a bed. It can be applied to.

[0066]

As described above, according to the present invention, when the elevating member is moved up and down, the upward and downward moment acting on the elevating member is increased and decreased by a force in the upward direction which opposes the moment. Since it can be increased or decreased in proportion to, it is possible to balance the lifting member in the entire range of the lifting member from the raised position to the lowered position,
In this entire range, the elevating member can be raised and lowered lightly and safely by a small force such as human power, regardless of the size of the placing load.

Furthermore, without using an air source or a power source, it is possible to arrange the actuating member on the side portion and to laterally lay the compression coil internal pipe on the rear portion to make the apparatus compact. Furthermore, even if the load placed on the lifting member changes greatly, it is possible to balance it according to the change,
Moreover, the adjustment can be easily performed, and it becomes versatile.

[Brief description of drawings]

FIG. 1 shows an embodiment in which the present invention is applied to a seat chair, and is a perspective view of a seat plate standing upright.

FIG. 2 is a perspective view showing a state where the seat plate is also lowered.

FIG. 3 is an exploded perspective view of the same seat chair.

FIG. 4 is a sectional view of a tube internally provided with a compression coil spring.

FIG. 5 is a perspective view of the balance adjusting device.

FIG. 6 is a perspective view of the braking device.

FIG. 7 is an explanatory diagram of the principle of producing a constant force and the principle of adjusting the strength of the constant force of the present invention.

FIG. 8 is a perspective view of an embodiment in which the present invention is applied to a table.

[Explanation of symbols]

 3 Seat plate 2a, 2b, 3a, 3b which is an elevating member Side frame 4 Parallel link mechanism 5a, 5b Actuating member 6 Compression coil spring internal pipe 7 Wire or chain 8 Balance adjusting device 9 Brake device 17a, 17b, 18a, 18b Parallel Link 23a, 23b Operating frame 25a, 25b Transmission arm 33 Compression coil spring 37 Feed nut 40 Feed screw 47 Brake release lever

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[Procedure amendment]

[Submission date] July 20, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

[0009]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems. The first invention is that the rear portions of both side frames (2a) and (2b) of the base frame (2) and the lifting member ( Both side frames (3a), (3b) in 3)
Of the base frame (2) on both sides of the frame (2).
a) and (2b) and the front portions of both side frames (3a) and (3b) of the elevating member (3) are connected by front links (18a) and (18b) to form a parallel link mechanism (4). ) And actuating frames (23a), (23b)
And a transmission arm (25a) which is vertically hung integrally with the rear part,
(25b) is provided with actuating members (5a), (5b), and the front portions of the actuating frames (23a), (23b) have one of the front and rear links (17a),
The upper end support shafts (19a) and (19b) of (17b) are rotatably connected to the transmission arms (25a) and (25b).
The lower end support shaft (2) of one of the links (17a) and (17b).
0a) and (20b) are rotatably connected, and a feed nut (37), a feed screw (40) screwed to the feed nut (37), and the feed screw are attached to the actuation frame (23a) of one actuation member (5a). Adjustment handle (45) that rotates (40) forward and backward
Balance regulatory system comprising a comprising a (8), provided with laterally placed the設管(6) within the compression coil spring at the rear of the lift member (3), said tube (6) compression coil spring in the (33) Is fixed to the one actuating member (5a) side and the other end is extendable, and the feed nut (37) and the other end of the compression coil spring (33) are connected by a wire or a chain (7). It is a feature.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

When the actuating members (5a), (5b) are rotated forward, the elevating member (3) descends in a horizontal posture.
Thus, when the actuating member (5a) is rotated forward, the wire (7) is pulled. As a result, the compression coil spring (33) is compressed, and the restoring force of the compression coil spring (33) increases. Explaining this with the principle diagram of FIG.
It corresponds to the support shafts (19a) and (19b) of the descending member (3).
When the point B descends to B ', it corresponds to the wire (7).
The restoring force of the compression coil spring (33) acting on (W)
That is, the drag force increases from vector AB to AB '.
Then, the vector BF at the point B and the vector B'F at the point B '
Are equal.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

Therefore, the load acting on the lifting member (3)
The weight and the upward pushing force of the vector BC above
Vectors AB and AB 'to fit, that is, the compression carp
By setting the drag force of the lub spring (33) to a predetermined value,
In the loaded state, the elevating member (3) is moved from the raised position to the lowered position
Balance can be achieved at any position
To raise and lower the lifting member (3) with a small amount of human power.
You can

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

In addition, the adjustment handle (45) is rotated to send it.
By displacing the position of the nut (37),
That is, in the principle diagram of FIG. 7, the point B can be displaced to the point D.
By the lever principle, the pushing force at point B
Some vectors change to BF short. Therefore, the lifting unit
If the load acting on the material (3) is light, adjust in this way.
Then, by decreasing the pushing force at point B,
It can be balanced with the load. Also, adjust hand
Rotate the dial (45) in the opposite direction to
It can be balanced against heavier loads.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction content]

The length of the four sides of this parallelogram ACBO is
Even if the rod L rotates and the angle of the rod changes, it does not change. Therefore, if a tension vector BA having a strength proportional to the length AB of the wire W is constantly applied, the force vector BC parallel to the Y axis that pushes up an arbitrary point on the rod L changes in the angle of the rod L. Regardless of, it will always be constant. Ie stick
Even if L is displaced to L ', its vector B'C' is a vector
Same as BC. The above is the principle of creating a constant force.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

Therefore, as the position of the wire W stretched on the rod L becomes closer to the origin O, the moment of the force acting on the rod L becomes proportionally smaller, so that the Y axis acting on an arbitrary point B on the rod L. The constant force parallel to is also reduced in proportion. The above is the principle of adjusting the strength of a constant force. Even in this case, the rod L
Even if L is displaced to L ', BF = B'F as in the above case.
It

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0043

[Correction method] Change

[Correction content]

The mounting position of the wire 7 with respect to the wire mounting device 36 is determined by the intersection of the axial center line of the feed screw 40 and the axial center lines of both the support shafts 38a and 38b, and the axial center line of the compression coil spring internal pipe 6. It is determined that the axis center line of the wire 7 is aligned with the line connecting and. Well
Also, the amount of deflection of the compression coil spring 33 depends on the operating frame.
23a moves from the retracted position of FIG. 1 to the advanced position of FIG.
Corresponds to the pull-out amount of the wire 7 that is pulled out when moving
It is set so that it can be bent.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0047

[Correction method] Change

[Correction content]

Next, the operation of this embodiment will be described. Destination
First, the relationship between the principle diagram shown in FIG. 7 and the seat chair shown in FIG.
Will be described. Point O in the above principle diagram is the operating frame.
Which corresponds to the support shaft 19a of the boom 23a, and is a rod L in the principle diagram.
Is equivalent to the operating lever 23a and the feed screw 40.
B point (or D point) is the support shaft 38 of the feed nut 37.
a and 38b, point A in the principle diagram is a compression coil
The wire W in the principle diagram corresponds to the middle point of the spring inner pipe 6.
Corresponds to the wire 7. Therefore, the Y-axis direction in the principle diagram
Connects the support shaft 19a to the middle point of the compression coil spring inner pipe 6.
Corresponding to the line, the intersection of the feed screw 40 and the support shafts 38a, 38b
The line that passes through and is parallel to the Y-axis is the vector in the principle diagram.
The direction is BC (B'C ').

[Procedure Amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0048

[Correction method] Change

[Correction content]

Further , both θ in FIG. 1 are set to the same angle.
And by being linked by the link 17a, etc.,
The direction of the vector BC parallel to the Y axis passes through the support shaft 19a.
Can be considered to be in phase with the vertical direction. Obey
And the direction of vector BC (B'C ') in the principle diagram
The force of the support shaft 19a, that is, the rising direction of the seat plate 3 and its pushing
It can be regarded as lifting force, so point B in the principle diagram
Will be described below as a means for raising and lowering the seat plate 3.

[Procedure Amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0049

[Correction method] Change

[Correction content]

Now, the state of FIG. 1 in which the seat plate 3 is high is shown in the principle diagram.
It is assumed that the rod is in the L position where it has moved upward. Also,
Rotate the adjustment handle 45 to adjust the position of the feed nut 37.
In fact, the pushing force of the vector BC in the above principle diagram
And the weight of the seated person should be balanced. This
The seat plate 3 of FIG. 1 is high, and the seat plate 3 of FIG. 2 is low.
When the seat is transformed into a sitting chair, the user is in the state shown in Fig. 1.
Sit on the seat plate 3 and hold the brake release lever 47
With the key loosened, place the armrests 24a, 24b in front
The seat plate 3 is lowered by rotating the seat plate 3 so as to push it out.

[Procedure Amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0050

[Correction method] Change

[Correction content]

This descending state is represented by the rod L in the above principle diagram.
Is in the state of moving down to L '. In this descending state
Compared with the state of FIG.
(3) The compression coil bar is pulled out from the inner pipe 6.
The spring receiving lid 35 of the inner pipe 6 moves to the right in FIG.
The contraction coil spring 33 is compressed.

[Procedure Amendment 13]

[Document name to be amended] Statement

[Correction target item name] 0051

[Correction method] Change

[Correction content]

As a result, the wire 7 is
In comparison, a large resistance acts on the external tension. sand
That is, in the principle diagram, rather than the force of the vector AB above
A large vector AB 'pulling force acts. Therefore, the original
The vector B'C 'in the vertical direction in the drawing is the above vector.
It does not change with Le BC and the pushing force according to the weight of the seated person is
It does not change.

[Procedure Amendment 14]

[Document name to be amended] Statement

[Correction target item name] 0052

[Correction method] Change

[Correction content]

When the seat plate 3 is moved downward in this way,
The drag force of the compression coil spring 33 increases in proportion to the amount of movement,
When the seat plate 3 is moved upward, the compression coil is proportional to the amount of upward movement.
The seat plate has a high
The set push-up force does not change even when the
The weight and the lifting force at any position.
It is possible to maintain

[Procedure Amendment 15]

[Document name to be amended] Statement

[Correction target item name] 0053

[Correction method] Change

[Correction content]

Next, push the vector BC in the principle diagram.
Explain the adjustment when a person who is lighter than the lifting force sits down
To do. Rotate the adjusting handle 45 to turn the feed screw 40
Rotate in one direction and set the feed nut 37 to the adjustment handle 45.
Move it closer to. That is, the principle diagram
Then, the point B is moved to the point D. Then, the explanation in the above principle diagram
As shown, the upward vector at point B in the principle diagram.
Due to the principle of leverage, Le BF is the vector B before adjustment.
It is less than the power of C. That is, the pushing force of the seat plate 3 is
Decrease.

[Procedure Amendment 16]

[Document name to be amended] Statement

[Correction target item name] 0054

[Correction method] Change

[Correction content]

The adjusting handle 45 is set in the opposite direction to the above.
Rotate the feed nut 37 to the adjustment handle 45
Move in the direction of receding from the point, point D in the principle diagram
When moved to the side, the pushing force approaches vector BC.
growing. Therefore, if the adjustment handle 45 is rotated in the forward or reverse direction,
Adjust the pushing force to balance the weight of the seated person.
I can save.

[Procedure Amendment 17]

[Document name to be amended] Statement

[Correction target item name] 0055

[Correction method] Change

[Correction content]

Even after the adjustment, the seat plate 3 is still seated.
When lifting up and down, the force to push up the seat plate 3 as above,
That is, the vectors BF and B'F in the principle diagram do not change, and
Just like above, you can balance your weight at any position.
it can. Furthermore, the above adjustments can be made steplessly and
The same balance as above can be achieved even after the paragraph.
It

[Procedure 18]

[Document name to be amended] Statement

[Correction target item name] 0056

[Correction method] Change

[Correction content]

When the seat plate 3 is moved up and down, the brake release lever 47 is gripped and the brake piece 52 is separated from the brake wheel 54. And the seat plate 3
If the brake release lever 47 is released at that position, the brake piece 52 is pressed against the brake wheel 54 by the urging force of the spring 53, and the seat plate 3 is immediately stopped to stop the brake release lever 47 at the desired height position. Can be stationary in position.

[Procedure Amendment 19]

[Document name to be amended] Statement

[Correction target item name] 0066

[Correction method] Change

[Correction content]

[0066]

As described above, according to the present invention , the elevating part is provided in the entire range of the elevating member from the raised position to the lowered position.
Generates a lifting force equivalent to the load acting on the material and raises and lowers
The material can be balanced, and the lifting member can
It can be raised and lowered easily and safely with a little force.

[Procedure amendment 20]

[Document name to be amended] Statement

[Correction target item name] 0067

[Correction method] Change

[Correction content]

[0067] Furthermore, it is possible to put together without the use of an air source and a power source, the apparatus is laterally placed to the rear of the compression coil spring within設管with arranging the operating member to the side compactly. Furthermore, a place different loads on the lifting member is placed
Also in case, it can be balanced in response to the load <br/> by adjustment of the balance adjustment device, and the tone principled
It is easy to write and versatile.

[Procedure amendment]

[Submission date] July 20, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 7

[Correction method] Change

[Correction content]

[Figure 7]

Claims (2)

[Claims] 1. A rear link (17a) between the rear parts of the side frames (2a), (2b) of the base frame (2) and the substantially central parts of the side frames (3a), (3b) of the elevating member (3). ), (17b), and the substantially central portions of both side frames (2a), (2b) of the base frame (2) and both side frames (3) of the elevating member (3).
a) and (3b) and the front part of the front links (18a), (1
8b) are connected to each other to form the parallel link mechanism (4), and the operating member (5a) is composed of the operating frames (23a) and (23b) and the transmission arms (25a) and (25b) that are vertically provided integrally with the rear portions thereof. ), (5b), and the front portions of the operating frames (23a), (23b) are provided with upper end support shafts (19a), (19b) of one of the front and rear links (17a), (17b). And the transmission arms (25a) and (25b) are connected to one of the links (17).
a) and (17b) are rotatably connected to lower end support shafts (20a) and (20b), and a feed nut (37) and a screw are attached to the feed frame (23a) of one of the working members (5a). A balance adjusting device (8) including a combined feed screw (40) and an adjustment handle (45) for rotating the feed screw (40) in a forward and reverse direction is provided, and a compression coil internal pipe is provided at a rear portion of the elevating member (3). (6) is provided horizontally, and a compression coil spring (33) is provided in the pipe (6) so that the one operating member (5a) side is fixed and the other end is extendable, and the feed nut (37). A balance lifting device, wherein the compression coil spring (33) and the other end of the compression coil spring (33) are connected by a wire or a chain (7). 2. A brake device (9) comprising a brake mechanism which is always urged to stop the rotation of the operating member (5a) and a brake release lever (47) which releases the brake mechanism. The balance lifting device according to claim 1.