JPS63183006A - Brake apparatus of rising and falling table - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a brake device used for an elevating table such as an elevating drafting table or a medical instrument elevating table.

[Conventional technology]

The lifting member is biased in the upward direction by a telescopic elastic device such as a gas spring, and the load in the direction of gravity applied to the lifting member is
A lifting platform which is balanced by the biasing force of this telescopic spring device and whose lifting member can be raised and lowered with a small operating force is disclosed in Japanese Utility Model Application Publication No. 56-125738 and German Patent No. 25
It is disclosed in Japanese Patent No. 49542. The brake devices of these elevating devices are configured such that when the downward force of the elevating member is transmitted to the brake shoe, the braking force of the brake shoe against the elevating member increases. With this configuration, when a malfunction such as gas leakage occurs in the telescopic elastic device, and the balance between the lifting force and the descending force of the elevating member is greatly lost, and a large descending force is generated on the elevating member, A brake device prevents the lifting member from falling suddenly. The brake device of Utility Model Application Publication No. 56-125738 has a large hole in the side wall of the outer leg member, the main part of the brake device is placed inside the outer leg member through this hole, and the main part is inserted into the side wall of the outer leg member. It is fixed at In the device of German Patent No. 2,549,542, a tightening lever to which a brake shoe is attached is rotatably supported by a pin on the upper inner wall surface of the outer leg member.

[Problem that the invention seeks to solve]

In all of the above brake devices, the main components are attached to the upper side wall of the outer leg member. Therefore,
In No. 6-125738, the brake shoes were worn out,
A large hole is provided in the upper side wall of the outer leg member so that the brake equipment can be removed from the outer leg member in the event of a failure of the brake equipment, but this complicates the machining of the outer leg member and also reduces the appearance. This will damage the quality of the product and reduce the value of the product. Furthermore, German Patent No. 2,549,542 does not disclose a structure for removing the brake device.

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

[Means to solve problems]

In order to achieve the above object, the present invention provides a brake device used for a lifting platform in which an inner leg member is inserted into a hollow leg member via a slide guide mechanism, and is detachable from the end side of the hollow leg member. a base 69 fixed to the base 69; a long brake board 70 fixed to the base 69 and having a brake shoe 72 attached to the free end; An elongated brake member 78 having a brake shoe 82 attached to its free end so as to face the wall surface of the inner leg member, and a brake shoe 82 formed at one free end of both the brake member 78 and the brake base plate 70. a protrusion 80a disposed on the other free end of the two in contact with the inclined surface 76a, and a brake member 78 such that the protrusion 80a is in pressure contact with the inclined surface. a return spring 84 that is engageable with the base 69 for biasing the base 69 in the longitudinal direction;
9 and a protrusion 94 provided on the brake member 78 in the vicinity of the brake member 78.

[Effect]

The brake device is comprised of one set, and when the device is installed inside the outer leg member, the device is inserted into the interior of the outer leg member from the open end of the hollow outer leg member. With this insertion, the brake shoes 82 on the brake member 78 side come into contact with the inner wall surface of the internal leg member, and the brake board 70
The side brake shoes 72 abut against the brake wall surface of the inner leg member or the outer leg member.

The platform 69 is then releasably secured to the open end of the outer leg member. Next, when the base of the elevating 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 attached to the outer leg member, the projection 80a is pressed against the inclined surface 76a by the tensile elasticity of the return spring 84 acting on the brake member 78. At this time, the brake member 7 is
8 and each brake shoe 82.72 of the brake board 70
During installation, the parts are pressed and displaced in the direction away from each other,
Due to this displacement, the brake shoes 7 on the brake board 70 side
2 and the brake shoe 82 on the brake member 78 side are pressed against the wall surfaces of the opposing leg members, and the inner leg member is attached to the brake shoe 72 on the side of the brake member 78.
．． 82 and the brake board 70 to the outer leg member.

If a malfunction occurs in the telescopic triggering device 8, such as gas leakage, and the upward resilient force of the telescopic resilient device 8 is eliminated, the balance between the upward force of the leg members on the lifting side and the downward force in the direction of gravity is lost. It collapses significantly, and the leg member on the elevating side tries to descend rapidly in the direction of gravity relative to the leg member on the fixed side. At this time, the protrusion 80a is strongly pressed against the inclined surface 76a by the gravitational action of the leg member on the elevating side, and is guided by the inclined surface 76a and displaced in the direction of increasing the brake. This displacement acts in the direction in which the brake shoes 72 and 82 press against the wall surfaces of the leg members facing each other, and the downward force due to the gravity of the leg members on the lifting side is applied to the brake shoes 72 and 82.
This is converted into a pressing force against the wall surface of the leg member No. 2, and the lowering of the leg member on the elevating side is prevented.

〔Example〕

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

Reference numeral 2 designates a base, to which a frame plate 6 is fixedly mounted, and to the frame plate 6, a telescopic elastic device 8.2 consisting of a known gas spring is mounted. A member 10 is fixed to a support for supporting the lower end of the holder. Pipe bodies 3 are fixed to the four corners of the frame plate 6 and communicate with bolt insertion holes formed at the four corners. Reference numeral 4 designates an outer leg member consisting of a hollow column having a square cross section, and nuts 5 are fixedly installed at the four corners of the lower end of this outer leg member. A bolt 7 inserted into the tubular body 3 is screwed into the nut 5, whereby the lower end of the leg member 4 is removably fixed to the base 2. Reference numeral 12.14 denotes an inner leg member consisting of a pair of hollow columns with a rectangular cross section, the upper part of which is fixed with a connecting plate 16, and the lower part of which is a pair of connecting plates 1.
8.20 is fixed with a screw. The connecting plate 1
6, 18.20 said pair of inner leg members 12.1
4 are connected and fixed in parallel to each other with a predetermined interval.

The upper end of the telescopic elastic device 8 is in contact with the lower surface of the connecting plate 16 . Between the inner wall surface of the outer leg member 4 and the outer wall surface of the inner leg members 12, 14 opposite to the inner wall surface, a pair of slides consisting of rollers 26 rotatably supported by retainers 22, 24 are provided. A guiding mechanism is provided. 28 is a horizontal rod fixed to the connecting plate 16;
A mounting plate for drawing boards and other objects is supported on this via a support frame.

A heavy object such as a drawing machine or a medical machine is installed on the mounting plate, and the machine, the mounting plate, and the inner leg member 12.
14 and the upward elastic force of the telescopic elastic device 8 are configured to be exactly balanced. Reference numeral 70 designates a brake board that is flexible and has a U-shaped cross section and has great strength against longitudinal compressive force, and its lower end is connected to the sixth
As shown in the figure, a bracket 92 at the lower end of the outer leg member 4,
92, to a stand 69 removably fixed with screws,
Fixed by welding. A brake shoe 72 is fixed to the upper part 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 part of the substrate 70, and the guide member 76 is formed with an inclined surface 76a.

Reference numeral 78 denotes a brake member having a U-shaped cross section and having high strength against longitudinal compressive force, and the member 78 is slidably fitted to the inner wall surface of the upper part of the substrate 70. A guide member 80 is fixed to the upper part of the brake member 78, and the guide member 8o is formed with a protrusion 80a having an inclined surface that abuts the inclined surface 76a.

A brake shoe 8 is provided on the outer wall surface of the upper part of the brake member 78.
2 is fixed, and the brake shoe 82 faces the outer wall surface of the inner leg member 14. Reference numeral 84 denotes a compression coil return spring suspended between a hook hole 93 provided in the stand 69 and a hole 96 formed in the appropriate tongue piece of the brake member 78, and the spring 84 is The brake member 78
is biased downward. A guide pin 98.98 is fixed to the lower end of the brake member 78, and the pin 98.98
8 is slidably inserted into a guide hole provided in the base 69. Projections 102 and 104 are formed at the upper and lower positions of the brake member 78, and a brake rod 106 is slidably inserted into holes formed in the projections 102 and 104. A protrusion 94 consisting of an adjustment nut is screwed into the threaded portion at the lower end of the rod 106. An adjustment bolt 108 is slidably inserted into the other hole formed in the projecting piece 104, and a nut member 110 is screwed into the threaded portion of the bolt 108.

A spiral groove is formed on the outer peripheral surface of the nut member 110, and a safety spring 1 made of a coil spring is installed in the groove.
The lower end of 12 is screwed. Said safety spring 1
A hook portion at the upper end of the rod 106 is engaged with a hole in a mounting piece 114 fixed to the upper part of the rod 106. The safety spring 112 is preloaded in the direction of the tensile force, and the preload of the spring 112 causes the head 108a of the bolt 108 and the washer 116 locked to the upper part of the rod 106 to , 102. A hole 118 is formed in the base 69, and the protrusion 94 is located in the hole 118 so that the head of the adjustment bolt 108 can be rotated from the underside of the base 69 using a rotating tool.

86 is a support shaft installed on the base 2, and a hole 90 in the middle part of the brake release operation member 88 consisting of a foot pedal is connected to the support shaft 86.
is rotatably inserted. Said adjustment bolt 1
08, safety spring 112° and brake rod 10
6 constitutes a transmission movement interrupting mechanism that prevents the brake release movement of the operating member 88 from being transmitted to the brake member 78 when the braking force of the brake shoe 82 against the inner leg member 14 exceeds a predetermined value. ing.

Next, the operation of this embodiment will be explained.

The accessories such as the base 69, the brake board 70, the brake member 78, the return spring 84, the brake shoes 72.82 attached to the brake board 7o and the brake member 78, the brake rod 106, and the safety spring 112 constitute one set of brake equipment. It consists of The above brake device is
Before mounting on the leg member 4, the lower end of the return spring 84 is normally removed from the hole 93 of the base 69 so that the tensile force of the return spring 84 does not act on the brake member 78.

The brake device is inserted into the leg member 4 from the open lower end of the leg member 4 with the base 2 removed.

After inserting the brake device so that the brake shoes 72 are in contact with the wall surface of the leg member 12 and the brake shoes 82 are in contact with the wall surface of the leg member 14, the stand 69 is bolted to the brackets 92 and 92 at the lower end of the leg member 4.

Secure with nuts, etc. Next, the return spring 112 is manually pulled through the hole 118 and its lower end is hooked into the hole 93 of the base 69 to apply a preload to the return spring 112. Next, the base 2 is fixed to the lower end of the leg member 4 by bolts 7.7. In this state, the brake release operation member 8
8 comes into contact with the lower end of the protrusion 94 , and the receiver member 10 contacts the lower end of the telescopic resilient device 8 .

In the above state, the tensile force of the return spring 84 causes the protrusion 80a of the brake member 78 to come into pressure contact with the inclined surface 76a of the brake board 70. The inclined surface 7 of this protrusion 80a
The brake member 78 is pressurized rightward in FIG. 7 by the pressing force against the brake pad 6a and the guiding action of the inclined surface 76a, and the brake shoe 82 is pressed against the outer wall surface of the inner leg member 14. The brake board 70 is displaced to the left in FIG. 7 due to the reaction force of the pressing force of the brake shoes 82 against the leg member 14, and as a result, the brake shoes 72 are pressed against the outer wall surface of the inner leg member 12, and the inner leg member 12. ．． 14 is fixed to the outer leg member 4. In this state, when a lifting force is applied to the inner leg member 12.14 by an external operating force, the inner leg member 1
The rising force of 2.14 is transmitted to the brake shoes 72.82 via frictional force. The brake shoe 72 is fixed to a brake board 7o fixed to the base 2 side, and has a protrusion 80a.
Since the inner leg member 12 is in pressure contact with the wall surface of the inner leg member 12 by the pressing force, a large restraining force acts on the inner leg member 12, and upward displacement of the inner leg member 12 is relatively firmly prevented. If the elastic force of the telescopic elastic device 8 is lost due to gas release or an accident while the brake is applied, the balance between the upward force and downward force of the inner leg members 12 and 14 will be greatly disrupted, and the mounting plate and The weight of the machinery attached thereto creates a large downward force on the inner leg member 12,14. At this time, the protrusion 80a is moved toward the inclined surface 76 by the downward force.
a, the brake shoe 72.82 presses against the wall surface of the inner leg member 12.14 with even greater pressure, and the braking force on the inner leg member 12.14 increases, causing the inner leg member 12.14 to fall suddenly. The bottom is blocked. As mentioned above, the degassing of the telescopic elastic device 8 is performed when the pressure force of the brake shoe 72.82 against the inner leg member 12.14 becomes larger than the normal value due to an accident or the like, and the value exceeds a predetermined value. , step on the operating member 88 with your foot, lower the pressing part, and swing the operating member 88 clockwise about the shaft 86 in the clockwise direction in FIG.
slides along the holes in the tongues 102, 104 of the brake member 78, and the brake member 78 does not rise. Therefore, even if the operating member 88 is stepped on with a foot, the transmission movement interrupting mechanism will not be activated and the brake will not be released. The limit value of the braking force of the brake device in which the transmission force interrupting mechanism operates is determined by the preload of the safety spring 112, and this preload is applied to the nut by manually rotating the bolt 108 through the hole 118 with a rotating tool. This can be adjusted by adjusting the screwing amount between the member 110 and the bolt 108. Note that this is in a state where the elastic force of the telescopic elastic device 8 is operating normally.

When the suppressing portion of the operating member 88 is stepped on, the operating member 88 swings clockwise in FIG. 4 about the shaft body 86, and the other end of the operating member 88 rises. This lift causes the brake rod 106 to rise, and the brake member 78 coupled to the brake rod 106 by the preload of the safety spring 112 is pushed up against the tensile force of the coil spring 84.

As the brake member 78 rises, the pressing force of the protrusion 80a against the inclined surface 76a is released, and the inner leg member 12°1
4 is released from being fixed to the outer leg member 4.

When a force is manually applied to the inner leg member 12.14 in the vertical direction in this state, the inner leg member 12.14 moves up and down along the leg member 4 by the guiding action of the slide guide mechanism. As the inner leg members 12.14 move, the rollers 26
The inner leg member 12.14 rotates due to friction between the opposing wall surfaces of the inner leg member 12.14 and the outer leg member 4, and the inner leg member 12 rotates by a displacement amount that is 1/2 of the vertical displacement amount of the inner leg member 12.14. It moves in a straight line in conjunction with the movement direction of .14.

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. In this case, the fourth
The composition of the figure is upside down. Further, the transmission movement interrupting mechanism shown in FIG. 4 is not particularly limited to the illustrated structure.

Further, in this embodiment, the leg members 12 and 14 on the elevating side have a two-piece structure, but they may also have a known single-piece structure. In this case, the brake shoes 72 contact the wall surface of the outer leg member. It is possible to have a configuration in which they touch each other. Remove one set of brake devices from the outer leg member 4, and remove the brake shoes 72.8.
2, warm the bolts 7.7, remove the base 2 from the lower end of the outer leg member 4, and attach the base 69 to the bracket 9.
Remove from 2°92. In this state, if the return spring 84 is removed from the hole 93 of the stand 69, one set of brake equipment can be easily removed from the open end of the leg member 4, and the brake equipment can be reset to the set state as described above. It can be attached to the leg member 4 with.

〔effect〕

As described above, the present invention employs a one-set structure for the brake device, and therefore has the advantage that the brake device can be inserted and removed very easily from the open end of the outer leg member of the lifting platform in the set state.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view, Fig. 2 is a longitudinal sectional view, Fig. 3 is a bottom view, Fig. 4 is a longitudinal sectional view, Fig. 5 is a sectional view taken along the line A-A with some parts omitted, and Fig. 6 is a longitudinal sectional view, and FIG. 7 is an enlarged longitudinal sectional view. 2... Base, 3... Pipe body, 4... Outer leg member. 5...Nut, 6...Frame plate, 7...Bolt. 8...Telescopic projectile device, 10...Bake is a member. 1.2, 14...inner leg member, 16, 18.2
0...Connecting plate, 22.24...Retainer,
26...Koro, 28...Horizontal rod, 70...
・Brake board, 72... Brake shoe, 74
...base plate. 76... Guide member, 76a... Inclined surface, 78
... Brake member, 80 ... Guide member,
80a... Protrusion, 82... Brake shoe, 84... Spring, 88... Brake release operation member. 92...Bracket, 93...Hook hole, 9
6...hole, 98...guide pin, 1
02,104... protrusion, 106... brake rod. 108... Adjustment bolt, 110... Nut member, 112... Safety spring, 11
4...Mounting piece, 116...Washer, 118...
... Hole Figure 1 Figure 2 Figure 3 Figure 5

Claims (1)

[Claims] (1) In a brake device used for a lifting platform in which an inner leg member is fitted into a hollow leg member via a slide guide mechanism, the base 69 is removably fixed to the end side of the hollow leg member. , an elongated brake board 70 fixed to the base 69 and having a brake shoe 72 attached to the free end side, and the inner leg member disposed on the brake board 70 so as to be movable along its longitudinal direction and at the free end thereof. an elongated brake member 78 to which a brake shoe 82 is attached so as to face the wall surface of the brake member 78; and an inclined surface 7 formed at one free end of both the brake member 78 and the brake base plate 70;
6a, and the inclined surface 7 on the other free end of the two.
6a and a protrusion 80a disposed in contact with the protrusion 80a;
The brake member 7 is pressed so that 0a is in pressure contact with the inclined surface.
A brake device comprising a return spring 84 that can be engaged with the base 69 for biasing the brake member 78 in the longitudinal direction, and a protrusion 94 located near the base 69 and provided on the brake member 78.