JPH0426021Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an elevating guide device used for an elevating table such as an elevating drafting table or a medical machine elevating table.

[Conventional technology]

In an elevating platform where the elevating leg member is guided up and down by rolling elements held in a retainer with respect to the fixed leg member, when the elevating leg member is repeatedly moved up and down, the rolling elements relative to the fixed leg member and the elevating leg member are The accumulation of minute slips causes an error in the rolling movement of the rolling element relative to the fixed leg member and the elevating leg member, and this error accumulates in either the upward or downward direction. Therefore, even if the elevating leg member is returned to the lowermost position relative to the fixed leg member, the rolling elements do not return to the predetermined position that was initially set when the elevating leg member was at the lowermost position, and the retainer The retainer may shift a considerable amount in one direction, that is, upward or downward, from the predetermined position relative to the elevating leg member, and in the worst case, the retainer may come off from between the fixed leg member and the elevating leg member. Become. Japanese Utility Model Publication No. 60-18656 solves the above problem by providing a stopper on either the fixed leg member or the elevating leg member to restrict the movement range of the retainer. Also, Tokko Akira
Japanese Patent No. 60-25650 solves the above problem by providing a guide portion such as a rack gear on the leg member and providing a wheel such as a gear that meshes with the rack gear on the retainer.

[Problem that the invention attempts to solve]

However, in the case of the former stopper method, the retainer and stopper collide with each other due to the vertical movement of the lifting leg members, so the retainer and stopper are likely to be damaged after long-term use, shortening their lifespan. There was a defect.

In addition, in the case of the latter configuration, a vehicle guide member having a friction surface over the movement range of the retainer or
Since a rack gear had to be formed, the structure was complicated and there were defects that increased costs.
Further, in the case of a gear type or in the case where the friction surface is made rough, noise is generated when the elevating leg member is moved up and down. If the friction surfaces are made smooth to prevent this noise from occurring, the car will slip, and in order to eliminate this slippage, if the car surface and the friction surface are made soft, the contact pressure between the two will cause the friction surface to slip between the car and the car. There was a defect that the surface was deformed due to long-term static contact.

The present invention aims to eliminate the above defects.

[Means to solve problems]

In order to achieve the above object, the present invention includes a fixed leg member 4, an elevating leg member 12 that can be raised and lowered with respect to the fixed leg member 4,
14, a rolling element 26 which is rotatably arranged between the leg members 4, 12, 14 and guides the elevating leg members 12, 14 in the ascending and descending direction along the fixed leg member 4; In a device consisting of retainers 22 and 24 that are rotatably held, pulleys 62 and 64 are provided above and below the retainers 22 and 24.
One side of a loop of a flexible transmission member 66 is locked to the fixed leg member 4 on the pulleys 62 and 64, and the other side is attached to the elevating leg member 1.
2 and 14.

[Effect]

In the above configuration, the elevating leg members 12, 14
When a force is applied in the vertical direction, the elevating members 12, 14
moves up and down along the fixed leg member 4. As the elevating leg members 12, 14 move, the rolling elements 26 roll along the wall surfaces of the leg members 4, 12, 14, and the retainers 22, 24 move by half the amount of movement of the elevating leg members 12, 14. The leg members 4, 12, 14 move with the amount of movement of
move along. When the retainers 22, 24 move relative to the leg members 4, 12, 14, the pulley 6
2 and 64 rotate due to friction with the transmission member 66. The retainers 22, 24 are the leg members 4, 12, 14
If it tries to shift vertically from its original position, this shift is prevented by the transmission member 66,
The retainers 22, 24 maintain the original positions initially set for the leg members 4, 12, 14, and do not shift from these original positions.

〔Example〕

The configuration of the present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

Reference numeral 2 denotes a base, on which a fixed leg member 4 consisting of a hollow column with a square cross section is erected.
A frame plate 6 is fixed to the base 2, and a receiving member 10 for supporting the lower end of a known gas spring 8 is fixed to the frame plate 6. Reference numerals 12 and 14 designate lifting leg members consisting of a pair of hollow columns with a rectangular cross section. A connecting plate 16 is fixed to the upper part of these columns with screws, and a pair of connecting plates 18 and 20 are attached to the lower part of these members.
is fixed with a screw. The connecting plate 1
6, 18, 20, the pair of elevating leg members 1
2 and 14 are connected and fixed in parallel to each other with a predetermined interval. A protrusion of the cylinder of the gas spring 8 is in contact with the lower surface of the connecting plate 16 . Between the inner wall surface of the fixed leg member 4 and the outer wall surface of the elevating leg members 12, 14 opposite to the inner wall surface, retainers 22, 24 having a U-shaped cross section are rotatably supported. A pair of slide guide mechanisms consisting of rolling elements 26 are arranged. In this embodiment, synthetic resin rollers are used as the rolling elements, but of course steel balls or the like may also be used. Reference numeral 28 denotes a horizontal rod fixed to the connecting plate 16, on which a board for placing drawings and other objects is supported via a support frame. Next, the structure of the slide guide mechanism will be explained with reference to FIGS. 4 and 5. Rectangular holes 3 are formed on both sides of the upper part of the flat plate part 22a of the retainer 22.
0 and 32 are transparently provided, and rolling element holders 34 and 36 are press-fitted into the holes 30 and 32, and each of the rolling element holders 34 and 36 has a pair of rolling elements 2.
6 is rotatably supported on a shaft 38. The shaft 38
is set perpendicular to the longitudinal direction of the flat plate portion 22a and horizontal to the plane of the flat plate portion 22a. Slightly below the intermediate portion of the flat plate portion 22a are holes 40, 42 having the same shape as the holes 30, 32 described above.
are transparently provided in the holes 40 and 42, and the rolling element holder 4
4 and 46 are press-fitted, and the rolling element holder 4
4 and 46, the rolling elements 26 are rotatably supported in the same manner as in the structure described above. The side plate parts 22b, 22c of the retainer 22 are also provided with holes at positions corresponding to the holes 30, 32, 40, 42 of the flat plate part 22a, and rolling element holders 48, 50, 5 are inserted into the holes.
2 and 54 are press-fitted. Each of the rolling element holders 48, 50, 52, and 54 has a side plate portion 2 that is horizontal to the side plate portions 22b and 22c.
A rolling element 26 is supported by a shaft 56 so as to be rotatable about an axis perpendicular to the longitudinal direction of the rollers 2b and 22c.
One surface of the rolling element 26 supported by the flat plate part 22a of the retainer 22 is in contact with the inner wall surface of the fixed leg member 4, and the other surface of the rolling element 26 is in contact with the outer surface of the elevating leg member 12. There is. The retainer 22
The rolling elements 26 supported on the side plate portions 22b and 22c of
One surface of the rolling element 26 is in contact with a mutually parallel inner wall surface of the fixed leg member 2, and the other surface of the rolling element 26 is in contact with a mutually parallel outer surface of the elevating leg member 12. The rolling element holder 34, 36, 44, 4
6, 48, 50, 52, and 54 are made of synthetic resin. Flat plate portion 22 of the retainer 22
Holes are provided above and below a, and pulley holders 58 and 60 made of synthetic resin are press-fitted into the holes. Belt pulleys 62 and 64 made of synthetic resin are supported rotatably about an axis horizontal to the other. Between the belt pulleys 62 and 64 is a transmission member 6 consisting of a loop-shaped synthetic resin belt with an appropriate tension.
6 is crossed. One of the loops of the transmission member 66 is fixedly locked to the inner wall surface portion 4a of the opposing fixed leg member 4 via a plate member, and the other loop of the transmission member 66 is fixed to the inner wall surface portion 4a of the opposing fixed leg member 4.
It is fixedly secured to a portion 12a of the outer wall surface by a metal fitting. The engagement portion 4a of the transmission member 66 with respect to the fixed leg member 4 is located just above the retainer 22 when the elevation leg member 12 is set to the lowest position, and the engagement portion 4a of the transmission member 66 with respect to the elevation leg member 12 is located just above the retainer 22. The stop portion 12a is set to be located exactly below the retainer 22 when the elevating leg member 12 is set to the lowest position. The retainer 24 side also has the same structure as the retainer 22 side. A cover member 68 is fitted onto the upper end of the fixed leg member 2.

Next, the brake mechanism will be explained.

Reference numeral 70 designates a brake board that is flexible and has great strength against longitudinal compressive force, and its lower end is fixed to a stand 69 that is fixed to the fixed leg member 4. A brake shoe 7 is provided on the board 70.
2 is fixed, and the brake shoe 72 faces the outer wall surface of the elevating leg member 12. A sawtooth guide member 7 is provided on the base plate 74 fixed to the upper part of the base plate 70.
6 is fixed, and an inclined guide surface 76 is fixed to the guide member 76.
a is formed. Reference numeral 78 denotes a brake member having a U-shaped cross section, and the member 78 is fitted to the inner wall surface of the upper part of the substrate 70 so as to be slidable in the longitudinal direction. A sawtooth-shaped guide member 80 is fixed to the upper part of the brake member 78, and the guide member 80 is formed with an inclined surface 80a.

The inclined surface 80a is in contact with the inclined surface 76a of the guide member 76. A brake shoe 82 is fixed to the upper outer wall surface of the brake member 78,
The brake shoe 82 faces the outer wall surface of the elevating leg member 14. Reference numeral 84 designates a compression coil spring suspended between a hook portion (not shown) provided on the stand 69 and a hole formed at an appropriate position in the brake member 78; is biased downward. 86 is a support shaft installed on the base 2, and a long hole 9 in the middle part of the petal 88 is connected to this shaft.
0 is slidably inserted. Said long hole 9
0 is formed to be elongated in the vertical direction, and the lower end wall surface of the elongated hole 90 is pressed against the outer peripheral surface of the support shaft 86 by the elastic force of the coil spring 92. Said petal 8
One side of the brake member 8 faces the lower end of a shaft body 94 fixed to the lower end of the brake member 78 . The elongated hole 90 of the petal 88 and the coil spring 92 constitute a safety device that prevents the brake release motion of the petal 88 from being transmitted to the brake member 78 when the pressing force of the brake shoe 82 against the leg member 14 exceeds a predetermined value. .

The upward elastic force of the gas spring 8 is raised and lowered by the weight of the support frame attached to the horizontal rod 28, the drawing board fixed to this, and the drawing machine (not shown) attached to the drawing board. It is set to be approximately the same as the magnitude of the downward load applied to the leg members 12 and 14.

Next, the operation of this embodiment will be explained.

Due to the tensile force of the coil spring 84, the inclined surface 80a on the brake member 78 side is pressed against the inclined surface 76a on the brake board 70 side. By this pressing force, the brake member 78 is guided rightward in FIG. 1, and the brake shoe 82 is pressed against the outer wall surface of the elevating leg member 14. On the other hand, the brake board 70 is guided to the left in FIG. 1 by the guiding action of the inclined surface 76a, and the brake shoe 72
2, thereby crimping the leg members 12,
14 is fixed to the fixed leg member 4. When one part of the petal 88 is stepped on and the petal 88 is swung clockwise in FIG. This results in
The pressing force of the inclined surface 80a against the inclined surface 76a is released, and the fixed leg members 4 of the elevating leg members 12 and 14
The fix is released. When force is manually applied in the vertical direction to the elevating leg members 12 and 14 in this state, the elevating leg members 12 and 14 move up and down along the fixed leg member 4 by the guiding action of the slide guide mechanism. As the elevating leg members 12 and 14 move, the rolling elements 26 move between the fixed leg member 4 and the elevating leg members 12 and 1.
4 and rotates due to friction with these, and interlocks with the moving direction of the lifting leg members 12, 14 by a displacement amount that is 1/2 of the vertical displacement amount of the lifting leg members 12, 14. to move in a straight line. Rolling element 2
6, along with the linear movement in the vertical direction along the opposing space between the elevating leg members 12 and 14 and the fixed leg member 4,
The retainers 22 and 24 move in the vertical direction. When the elevating leg members 12, 14 move upward, the retainers 22, 24 move upward by half the amount of movement. The leg members 12 and 1 of the transmission member 66 are
4 moves upward relative to the pulley 64. On the other hand, the amount of upward movement of the locking portion 12a with respect to the pulley 64 is
a moves downward relative to the pulley 62, and as a result, the retainers 22 and 24 are not prevented from moving upward by the transmission member 66 as the rolling elements 26 rotate. It moves upward at a ratio of 2:1 following the upward movement of the lifting leg members 12 and 14, and the transmission member 66 moves upward at a ratio of 2:1.
The tensioned loop state is maintained. Similarly, when the elevating leg members 12 and 14 are moved downward, the retainers 22 and 24 are not hindered by the tension of the transmission member 66 at a rate of 1/2 of the movement of the elevating leg members 12 and 14. ,
The transmission member 66 moves downward, and the tensioned loop state of the transmission member 66 is maintained. Therefore, the retainers 22 and 24 are attached to the lifting leg members 12 and 1.
If the rolling elements 26 tend to shift in the vertical direction with respect to the lifting leg members 12 and 14 due to factors other than the normal rotational movement accompanying the vertical movement of the rolling elements 4, this deviation is prevented by the transmission member 66. That is, in FIG. 4, only the retainer 22 is moved without upward movement of the elevating leg member 12. Even if an attempt is made to move upward relative to the leg member 12 in a stationary state, the locking portion 4
The transmission member 66, which is locked to a and 12a, does not deform upward even when pressure is applied upward from the pulley 62, and prevents the pulley 62 from moving upward, and the retainer 22 moves upward. Can't move. Similarly, when the retainer 22 attempts to move downward in FIG. 4 relative to the stationary leg member 12, downward pressure is applied from the pulley 64 to the transmission member 66. However, the transmission member 66 that is engaged with the portions 12a, 4a is not deformed downward by the pressing force from the pulley 64, and the downward movement of the retainer 22 is prevented. That is, movement of the retainers 22, 24 relative to the leg members 12, 14, 4 due to factors other than the normal rotation of the rolling elements 26, for example, the rolling elements 2
The leg members 12, 1 of the retainer 22, 24 due to the misalignment between the surface of the retainer 6 and the wall surface of the leg members 12, 14, 4.
4, 4 is prevented by a transmission member 66. When you take your foot off the pedal 88 and release the upward pressure on the brake portion 78, the brake shoes 72, 82 are pressed against the wall surfaces of the lifting leg members 12, 14 by the tensile force of the coil spring 84, and the lifting leg member 12 , 14 are fixed to the fixed leg member 4. Note that the inner column may be a fixed side, and the outer column may be moved up and down relative to it.

〔effect〕

As described above, the present invention involves a flexible transmission member such as a belt being wrapped around a retainer for holding rolling elements, which is placed between a pair of leg members that are in a relationship of relative linear reciprocating movement, through a pulley. One side of the loop of the member was locked to one of the pair of leg members, and the other side of the loop of the transmission member was locked to the other of the pair of leg members, so that it could not be used for a long time. To prevent a retainer from being displaced from its original position with respect to the leg member even when the retainer moves with respect to the leg member, and to prevent an accumulation phenomenon in one direction of movement errors of the retainer with respect to the leg member by a simple structure. There is an effect that can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a front longitudinal sectional view, Fig. 2 is a partially omitted sectional view taken along line A-A, Fig. 3 is a side longitudinal sectional view, and Fig. 4 is a longitudinal sectional view from the side.
The figure is an enlarged sectional view of the main part, and FIG. 5 is an enlarged sectional view of the main part. 2...Base, 4...Fixed leg member, 6...Frame plate,
8...Gas spring, 10...Receiving member, 1
2, 14... Lifting leg member, 16, 18, 20...
Connecting plate, 22, 24... Retainer, 22a... Flat plate part, 22b, 22c... Side plate part, 26... Rolling element, 28... Horizontal rod, 30, 32... Hole, 34, 3
6...Rolling element holder, 38...Shaft, 40, 42
... Hole, 44, 46 ... Rolling element holder, 48,
50, 52, 54...Rolling element holder, 56...
Shaft, 58, 60...Pulley holder, 62, 64
... Belt pulley, 66 ... Transmission member, 68 ...
Cover member, 70... Brake board, 72... Brake shoe, 74... Base plate, 76... Guide member,
76a... Inclined guide surface, 78... Brake member,
80... Guide member, 80a... Inclined surface, 82...
Brake shoe, 84... Coil spring, 86... Support shaft, 88... Petal, 90... Long hole, 92... Coil spring, 94... Shaft body.

Claims (1)

[Scope of utility model registration request] A fixed leg member 4, elevating leg members 12, 14 that can be raised and lowered with respect to the fixed leg member 4, and both leg members 4, 12, 1.
4, the elevating leg member 1
2, 14 in the vertical direction along the fixed leg member 4, and retainers 22, 24 that rotatably hold the rolling elements 26, the vertical positions of the retainers 22, 24 pulleys 62 and 64 are rotatably supported on the pulleys 62 and 64.
2, 64, one side of a loop of a flexible transmission member 66 is locked to the fixed leg member 4, and the other side is locked to the lifting leg members 12, 14. Guidance device.