JPH0722527B2 - Breaker for lifting platform - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a brake device used for an elevation table such as an elevation drafting table or a medical instrument elevating table.

[Conventional technology]

The elevating member is urged in the ascending direction by a stretchable elastic device such as a gas spring, and the load in the direction of gravity applied to the elevating member is
An elevating table in which the elevating member can be moved up and down with a small operating force by balancing it with the urging force of the telescopic elastic device is disclosed in Japanese Utility Model Publication No. 56-125738 and German Patent No. 2549542. The braking device of these lifting devices, when the descending force of the lifting member is transmitted to the brake shoe,
The braking force of the brake shoe with respect to the lifting member is increased. By configuring in this way,
When a failure such as gas escape occurs in the elastic elastic device, and the balance between the lifting force and the lowering force of the lifting member is greatly lost and a large lowering force is generated in the lifting member, the brake device causes a sudden drop of the lifting member. It is blocking. In the brake device of Japanese Utility Model Laid-Open No. 56-125738, a large hole is formed in the side wall of the outer leg member, the main part of the brake device is arranged in the outer leg member through this hole, and the main part is attached to the side wall of the outer leg member. It is fixed to.
The device of German Patent No. 2549542 rotatably supports a tightening lever, to which a brake shoe is attached, on a top inner wall surface of an outer leg member by a pin.

[Problems to be solved by the invention]

In each of the above-mentioned braking devices, main constituent parts are attached to the upper side wall of the outer leg member. Therefore, the actual exploitation 56
In −125738, a large hole is provided in the upper side wall of the outer leg member so that the brake device can be removed from the outer leg member when the brake shoe is worn or the brake device fails. Not only does this complicate the processing of the outer leg member, but it also impairs the appearance and reduces the commercial value. Further, German Patent No. 2549542 does not disclose a structure for removing the brake device.

It is an object of the present invention to allow the brake device to be easily installed and replaced from the end release of the outer leg member.

[Means for solving problems]

In order to achieve the above object, the present invention is a brake device used in an elevator having an inner leg member fitted and arranged in a hollow leg member via a slide guide mechanism, which can be attached to and detached from the end of the hollow leg member. A base 69 fixed to the base 69, an elongated brake base plate 70 fixed to the base 69 and having a brake shoe 72 attached to its free end side, and arranged on the brake base plate 70 movably along the longitudinal direction thereof. A long brake member 78 having a brake shoe 82 attached to the free end thereof so as to face the wall surface of the inner leg member, and formed on one free end of both the brake member 78 and the brake base plate 70. Sloped surface 76a, a protruding portion 80a arranged at the other free end of the both in contact with the inclined surface 76a, and the protruding portion 80a.
A return spring 84 engageable with the base 69 for urging the brake member 78 in the longitudinal direction so that a comes in pressure contact with the inclined surface, and the brake member 78 located near the base 69.
And a projection 94 provided on the.

[Action]

The braking device is composed of one set, and when the device is mounted inside the outer leg member, the device is inserted into the outer leg member from the open end of the hollow outer leg member. By this insertion, the brake shoe on the brake member 78 side
The reference numeral 82 makes contact with the inner wall surface of the inner leg member, and the brake shoe 72 on the brake board 70 side makes contact with the brake wall surface of the inner leg member or the outer leg member.

Next, the platform 69 is releasably secured to the release end of the outer leg member. Next, when the base of the lift table is releasably fixed to the release side end of the outer leg member, the brake release operation member provided on the base side engages with the protrusion 94 provided on the brake member 78 side.
When the brake device is mounted on the outer leg member, the protrusion 80a is pressed against the inclined surface 76a by the tensile elastic force of the return spring 84 that acts on the brake member 78. At this time, the inclined surface 76a
Of the brake member 78 and the brake base plate 70 are displaced in a direction in which the brake shoe 82 and 72 mounting portions of the brake base plate 70 are pushed away from each other. The brake shoe 82 is pressure-bonded to the wall surfaces of the leg members facing each other, and the inner leg member is fixed to the outer leg member via the brake shoe 72, 82 and the brake base plate 70.

When a failure such as gas escape occurs in the elastic elastic device 8 and the upward elastic force of the elastic elastic device 8 is erased, the balance between the ascending force of the leg member of the elevating member and the descending force in the direction of gravity is large. The leg members on the ascending / descending side tend to suddenly descend in the direction of gravity relative to the leg members on the fixed side. At this time, the protrusion 80a is strongly pressed against the inclined surface 76a due to the gravitational action of the leg member on the up-and-down side, and is guided by the inclined surface 76a and displaced in the brake increasing direction. This displacement acts in a direction in which the brake shoes 72 and 82 are crimped to the wall surfaces of the leg members facing each other, and the downward force due to the gravity of the leg members on the ascending / descending side is converted into a crimping force to the leg member wall surfaces of the brake shoes 72 and 82. As a result, the leg members on the ascending / descending side are prevented from descending.

〔Example〕

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

2 is a base, on which a frame plate 6 is fixed,
Further, a receiving member 10 for supporting the lower end of the expansion / contraction elastic device 8 composed of a known gas spring is fixed. At the four corners of the frame plate 6, pipes 3 communicating with bolt insertion holes formed at the four corners are fixed. Reference numeral 4 denotes an outer leg member formed of a hollow column having a quadrangular cross section, and nuts 5 are fixed to the four corners of the lower end of the outer leg member. A bolt 7 inserted into the pipe body 3 is screwed into the nut 5, whereby the lower end of the leg member 4 is detachably fixed to the base 2. Reference numerals 12 and 14 denote inner leg members composed of a pair of hollow columns each having a quadrangular cross section.A connecting plate 16 is fixed to the upper part of the column by screws, and a pair of connecting plates 18 and 20 is fixed to the lower part of the column by screws. Has been done. The pair of inner leg members 12, 14 are connected and fixed in parallel with each other by the connecting plates 16, 18, 20 at a predetermined interval. The lower end of the connecting plate 16 is in contact with the upper end of the elastic expansion device 8. An inner wall surface of the outer leg member 4 and the inner leg member facing the inner wall surface.
A pair of slide guide mechanisms including rollers 26 rotatably supported by retainers 22 and 24 are arranged between the outer wall surfaces of 12 and 14. Reference numeral 28 denotes a horizontal rod fixed to the connecting plate 16, on which a drawing plate and other mounting plates are supported via a support frame. A heavy object such as a drafting machine or a medical machine is installed on the mounting plate, and the total weight of the machine, the mounting plate, and the inner leg members 12 and 14 and the upward elastic force of the elastic expansion / contraction device 8 are It is designed to be just balanced. Reference numeral 70 denotes a flexible brake base plate having a U-shaped cross section and having a large strength against a compressive force in the longitudinal direction. The lower end of the brake base plate 70 is a bracket at the lower end of the outer leg member 4 as shown in FIG.
92, 92, a base 69 that is detachably fixed with screws,
It is fixed by welding. A brake shoe 72 is fixed to the upper portion of the brake board 70, and the brake shoe 72 faces the outer wall surface of the inner leg member 12. A sawtooth-shaped guide member 76 is fixed to a base plate 74 fixed to the upper portion of the substrate 70, and an inclined surface 76a is formed on the guide member 76. Reference numeral 78 denotes a brake member having a U-shaped cross section having a large strength against the compressive force in the longitudinal direction, and the member 78 is slidably fitted to the inner wall surface of the upper portion of the base plate 70. A guide member 80 is fixed to the upper portion of the brake member 78, and the guide member 80
Further, a protrusion 80a having an inclined surface that abuts the inclined surface 76a is formed.

A brake shoe 82 is fixed to the outer wall surface of the upper portion of the brake member 78, and the brake shoe 82 faces the outer wall surface of the inner leg member 14. Reference numeral 84 is a compression coil return spring suspended between a hooking hole 93 provided in the base 69 and a hole 96 formed in a tongue piece at a proper position of the brake member 78. The brake member 78 is urged downward. Guide pins 98, 98 are fixed to the lower end of the brake member 78, and the pins 98, 98 are slidably fitted in guide holes formed through the base 69. The brake member 78
Projecting pieces 102, 104 are formed at upper and lower positions of the projecting pieces 102, 104, respectively.
The brake rod 106 is slidably inserted into the hole formed in the. A protrusion 94 made of an adjust nut is screwed onto the threaded portion at the lower end of the rod 106. An adjusting bolt 108 is slidably inserted into the other hole formed in the projecting piece 104, and a nut member 110 is screwed into a threaded portion of the bolt 108. A groove is formed in a spiral shape on the outer peripheral surface of the nut member 110, and the lower end of a safety spring 112 formed of a coil spring is screwed into the groove. The hook portion at the upper end of the safety spring 12 has the rod 106
Is engaged with a hole of a mounting piece 114 fixedly provided on the upper part of the. A preload is applied to the safety spring 112 in a pulling direction, and a washer 116 locked to the head 108a of the bolt 108 and the upper portion of the rod 106 is applied by the preload of the spring 112.
Is in elastic contact with the tongues 104 and 102. A hole 118 is formed in the table 69 so that the head of the adjusting bolt 108 can be rotated by a rotating tool from the lower surface side of the table 69, and the protrusion 94 is located in the hole 118. Reference numeral 86 denotes a support shaft which is erected on the base 2, and a hole 90 in an intermediate portion of a brake release operation member 88 formed of a foot pedal is rotatably fitted therein. The adjustment bolt 108, the safety spring 112, and the brake rod 106 serve as the brake shoe.
A transmission motion interrupting mechanism is configured to prevent the brake releasing motion of the operating member 88 from being transmitted to the brake member 78 when the braking force of 82 on the inner leg member 14 exceeds a predetermined value.

Next, the operation of this embodiment will be described.

The platform 69, the brake board 70, the brake member 78, the return spring 84, and the brake shoes 72 and 82 attached to the brake board 70 and the brake member 78, the brake rod 106, the safety spring 112 and the like are a set of brake devices. Are configured. Before the brake device is attached to the leg member 4, the lower end of the return spring 84 is normally removed from the hole 93 of the stand 69 so that the pulling force of the return spring 84 does not act on the brake member 78. The insertion of the brake device into the leg member 4 is performed from the lower end release portion of the leg member 4 with the base 2 removed. After inserting the brake device so that the brake shoe 72 contacts the wall surface of the leg member 12 and the brake shoe 82 contacts the wall surface of the leg member 14, the base 69 is bolted to the brackets 92, 92 at the lower end of the leg member 4. Secure with nuts. Next, the return spring 112 is manually pulled from the hole 118, the lower end thereof is hooked on the hole 93 of the base 69, and the return spring 112 is preloaded. Next, the base member 2 is attached to the leg member 4 with the bolts 7 and 7.
Secure to the bottom edge of. In this state, the tip of the brake release operating member 88 abuts on the lower end of the protrusion 94, and the receiving member 10 abuts on the lower end of the telescopic resilient device 8.

In the above state, the protrusion 80a of the brake member 78 is pulled by the pulling force of the return spring 84 so that the inclined surface 76a of the brake base plate 70 is formed.
Press against. Due to the pressure contact force of the protrusion 80a against the inclined surface 76a and the guiding action of the inclined surface 76a, the brake member 78 is moved to the seventh position.
In the figure, the brake shoe 82 is pressed to the right and the inner leg member
Crimp to the outer wall of 14. This brake shoe 82 leg member 14
The brake base plate 70 is displaced to the left in FIG. 7 by the reaction force of the crimping force against the brake plate 72, whereby the brake shoe 72 is pressure-bonded to the outer wall surface of the inner leg member 12, and the inner leg members 12 and 14 are outer leg members. It is fixed at 4. The inner leg members 12, 1 in this state
When a lifting force is applied to the outer leg member 4 by the external operation force, the lifting force of the inner leg members 12, 14 is transmitted to the brake shoes 72, 82 via frictional force. Since the brake shoe 72 is fixed to the brake base plate 70 fixed to the base 2 side and is pressed against the wall surface of the inner leg member 12 by the pressing force from the protrusion 80a, a large stopping force is exerted on the inner leg member 12. As a result, the upward displacement of the inner leg member 12 is relatively firmly prevented. If the elastic force of the elastic expansion / contraction device 8 is erased due to a gas escape accident or the like while the brake is applied, the balance between the ascending force and the descending force of the inner leg members 12 and 14 is greatly lost and the mounting plate and the mounting plate A large descending force is generated in the inner leg members 12 and 14 due to the weight of the machine etc. At this time, the protrusion 80a is pressed against the inclined surface 76a by the above descending force, and the brake shoe 72, 82
Is pressed against the wall surfaces of the inner leg members 12 and 14 with a larger pressure, the braking force on the inner leg members 12 and 14 is increased, and the sudden drop of the inner leg members 12 and 14 is prevented. As described above, in the state where the pressure contact force of the brake shoe 72, 82 with respect to the inner leg members 12, 14 becomes larger than the normal value due to the gas escape accident of the elastic expansion device 8, etc., and the value exceeds the predetermined value, When the operating member 88 is stepped on with a foot, its pressing portion is lowered, and the operating member 88 is swung in the clockwise direction in FIG. 4 around the shaft 86, the safety spring 112 extends, and the brake rod 106 moves to the brake member.
Sliding along the holes in the tongues 102, 104 of 78, the brake member 78 does not rise. Therefore, even if the operating member 88 is stepped on with a foot, the transmission motion interruption mechanism does not work and the brake is not released. The limit value of the braking force of the brake device on which the transmission force interruption mechanism works is determined by the preload of the safety spring 112, and this preload is caused by manually rotating the bolt 108 from the hole 118 by the rotating tool to rotate the nut. It can be adjusted by adjusting the screwing amount of the member 110 and the bolt 108. When the pushing force of the operating member 88 is stepped on while the elastic force of the telescopic elastic device 8 is operating normally, the operating member 88 moves clockwise around the shaft 86 in FIG. It swings and the other end of the operating member 88 rises. Due to this rise, the brake rod 106 rises, and the brake rod 1
The brake member 78, which is connected by the preload of 06 and the safety spring 112, is pushed up against the tensile force of the coil spring 84. As the brake member 78 rises, the pressure contact force of the protrusion 80a with respect to the inclined surface 76a is released, and the fixation of the inner leg members 12 and 14 with respect to the outer leg member 4 is released. In this state, when a force is manually applied to the inner leg members 12 and 14 in the vertical direction, the inner leg members 12 and 14 move up and down along the leg member 4 by the guide action of the slide guide mechanism. With the movement of the inner leg members 12 and 14, the roller 26 is rotated by friction between the inner leg members 12 and 14 and the facing wall surfaces of the outer leg member 4, and the inner leg members 12 and 14 are displaced in the vertical direction. With the displacement amount of 1/2 of the amount, the inner leg members 12 and 14 move in a linear direction in conjunction with the moving direction.

In the embodiment of the present invention, the inner leg member may be the fixed side and the outer leg member may be the elevating side.
The configuration shown in the figure is reversed. The transmission motion interruption mechanism shown in FIG. 4 is not limited to the structure shown in the drawing.

Further, in the present embodiment, the leg members 12 and 14 on the elevating side have two structures, but they may have a known single structure. In this case, the brake shoe 72 contacts the wall surface of the outer leg member. It can be configured to be in contact with each other. When removing one set of the brake device from the outer leg member 4 and replacing the brake shoes 72, 82, the bolts 7, 7 are warmed to remove the base 2 from the lower end of the outer leg member 4, and the base 69 is attached to the bracket 92, 82. Remove from 92.
In this state, by removing the return spring 84 from the hole 93 of the base 69, one set of brake device can be easily removed from the open end of the leg member 4, and the brake device can be set again in the same manner as described above. It can be attached to the leg member 4.

〔effect〕

According to the present invention, as described above, since the brake device has one set structure, there is an effect that the brake device can be inserted and removed very easily from the open end of the outer leg member of the lift table in the set state.

[Brief description of drawings]

1 is a vertical sectional view, FIG. 2 is a vertical sectional view, FIG. 3 is a bottom view, FIG. 4 is a vertical sectional view, and FIG.
FIG. 6 is a vertical sectional view, and FIG. 7 is an enlarged vertical sectional view. 2 ... Base, 3 ... Tube, 4 ... Outer leg member, 5 ... Nut, 6
…… Frame plate, 7 …… Bolt, 8 …… Expanding elastic device, 10 …… Receiving member, 12,14 …… Inner leg member, 16,, 18,20 …… Coupling plate, 22,24
…… Retainer, 26 …… Roller, 28 …… Yoko rod, 70 …… Brake base plate, 72 …… Brake shoe, 74 …… Bedboard, 76 …… Guide member,
76a …… Inclined surface, 78 …… Brake member, 80 …… Guide member, 80
a …… Projection, 82 …… Brake shoe, 84 …… Spring, 88 …… Brake release operating member, 92 …… Bracket, 93 …… Hooking hole, 9
6 …… hole, 98 …… guide pin, 102, 104 …… projecting piece, 106 …… brake rod, 108 …… adjusting bolt, 110 …… nut member, 112 …… safety spring, 114 …… mounting piece, 116 …… Washer, 118 …… hole

Claims (1)

[Claims] 1. A brake device for use in an elevator having a hollow leg member fitted with an inner leg member via a slide guide mechanism. The brake device is detachably fixed to the end of the hollow leg member. 69, an elongated brake base plate 70 fixed to the base 69 and having a brake shoe 72 attached to the free end side thereof,
An elongated brake member having a brake shoe 82 attached to the brake base plate 70 so as to be movable along the longitudinal direction of the brake base plate 70 so as to face the wall surface of the inner leg member at its free end.
78, an inclined surface 76a formed at one free end of both of the brake member 78 and the brake base plate 70, and the other free end of the both is disposed in contact with the inclined surface 76a. A protrusion 80a, a return spring 84 engageable with the base 69 for urging the brake member 78 in the longitudinal direction so that the protrusion 80a presses the inclined surface, and the vicinity of the base 69. Located on the brake member 78 and provided on the protrusion 94.
Brake device consisting of.