JPS6118737Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lifting brake operating device for fixing and releasing the lifting legs at any position on a drafting table that can be moved up and down.

Conventionally, in this type of device, when the pedal of the brake operating lever is depressed and lowered, the brake on the elevating leg member is released, and when the brake operating pedal is released, the brake is released on the elevating leg member. The structure is such that a brake can be applied to the vehicle. If the brake operating lever protrudes too far toward the drafter, it will get in the way of the drafter, so the pedal is placed close to the upright leg member.
When adjusting the height of the drawing board, the user must always press the pedal with his or her foot, making it impossible to raise and lower the drawing board in a free position, making the raising and lowering operation extremely difficult. Particularly in the case of a physically handicapped person, there are restrictions on the operating posture, so there is a drawback that it is difficult to perform lifting and lowering operations. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a brake operating device that allows lifting and lowering operations to be performed in a free position.

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 having a shape suitable for being placed on a floor surface, and an upright leg member 4 made of a hollow member having a square cross section is slanted and erected on this base. Reference numeral 6 denotes an elevating leg member made of a hollow member having a square cross section, and is loosely fitted into the hollow portion of the upright leg member 4. A plurality of rollers 8 are rotatably supported on the elevating leg member 6, and the rollers 8 are attached to the upright leg member 4.
The rail members 10, 12, and 14 are fixed to the inner wall surface of the rail over substantially the entire length in the longitudinal direction, and are in contact with appropriate pressure. The 8 groups of rollers and the rail members 10, 1
2 and 14, the lifting leg member 6
is supported by the upright leg member 4 so as to be movable up and down along its longitudinal direction. A lateral support rod 16 is fixed to the upper end of the elevating leg member 6, and at both ends of the rod 16,
A support frame 18 is rotatably attached. 20
is a support frame fixing and fixing release lever, and by operating this lever 20, the support frame 18 can be set to a desired inclination angle. Support frame 18
A drawing board (not shown) is installed at the drawing board 24, and a drawing machine (not shown) is installed therein. A gas spring 24 is disposed between a support plate 22 fixed to the bottom of the lower end of the upright leg member 4 and a support plate (not shown) fixed to the upper end of the elevating leg member 6.
The lifting leg member 6 is urged upward by the elasticity of the gas spring 24. When the drawing board and the drawing machine are mounted on the support frame 18, the total weight of these and the weight of the lifting leg member 6 is adjusted so that the upward biasing force of the gas spring 24 on the lifting leg member 6 is exactly balanced. is set to .
26 is a first brake operating lever, one end of which is supported by a shaft 30 on a plate member 28 fixed to the lower part of the rail member 10 so as to be rotatable in a plane perpendicular to the floor surface. . The other side of the lever 26 is connected to a notch 3 formed in the lower front part of the upright leg member 4.
A pedal 34 is located within the lever 26 and is fixed to the other end of the lever 26. A notch (engaging portion) 36 is formed approximately in the middle of the upper surface of the lever 26 . Reference numeral 38 designates a second brake operating lever which is rotatably supported by a shaft 40 approximately in the middle of the side surface of the lever 26, and has a protruding piece 42 formed at one end thereof. The other side of the lever 38 projects outward from the notch 32, and the other side of the lever 38
The other side is a slit 4 transparently provided in the pedal 34.
4, and a pedal 46 is fixed to the other end of the lever 38. 48 is lever 26
One end of the spring is wound around a shaft fixed to the lever 38, and one end of the spring is engaged with the lower surface of the lever 26, and the other end is in elastic contact with a shaft 50 that projects from one end of the lever 38. The lever 38 is biased by the spring 48 in the direction of rotation of the hour hand about the shaft 40, and the lever 38
are locked oppositely to the pedal 34 with a predetermined distance therebetween. Reference numeral 52 designates a link piece whose one end is rotatably supported by a shaft 54 on the plate member 28, and from the other end of which a locking shaft (locking member) 56 is protruded. The link piece 52 is biased in the counterclockwise direction in FIG. ing. Reference numeral 90 designates a stopper shaft, and 58 designates a swinging arm, one of which is provided with a hole 60, into which a shaft 62 protruding from the side wall 6a of the elevating leg member 6 is loosely fitted. A shaft 64 is fixed to the other side of the swinging arm 58, and the shaft 64 is
The elevating leg member 6 is inserted through a long hole 66 transparently provided in the side wall 6a.
protrudes inside. A roller 68 having a rubber ring fitted on its surface is rotatably supported at one end of the swinging arm 58, and a brake shoe 70 is fixedly attached to the other end. is facing. A coil spring 72 has one end attached to the wall surface of the elevating leg member 6 and the other end attached to the shaft 64. The hour hand is biased in the direction of rotation, and by this biasing force,
The brake shoe 70 is in pressure contact with the rail surface of the rail member 10. Reference numeral 74 denotes a long flexible member having a length corresponding to the lifting range of the lifting leg member 6 and connected to the mounting piece 76 fixed to the lifting leg member 6 and the mounting piece 78 provided on the plate member 28. A wire 80 is movably inserted into the tube, and one end of the wire 80 is connected to the shaft 64 and the other end is connected to the shaft 40.

Note that the tube 74 is shown in a shortened form in FIG. 2 for convenience to avoid complicating the drawing.

Note that in this embodiment, the swinging arm 58 and the wire 8
0, the first brake operation lever 26 and the brake pedal 46 are brakes that stop the elevating leg member toward the upright leg member when the brake pedal is in the raised position, and release the stop when the brake pedal is lowered. The link piece 52, the locking shaft 56, and the notch 36 constitute a brake release holding mechanism that maintains the release of the brake even if the pressure applied to the brake pedal is released, and the pedal 46, the second brake The operating lever 38 and the protruding piece 42 constitute a brake release holding state release mechanism that releases the above-mentioned brake release holding operation of the brake release holding mechanism.

Next, the operation of the present invention will be explained.

When the designer presses the pedal 34 with his foot and lowers it to the lowest position, the lever 38 rotates about the shaft 30 in the counterclockwise direction of rotation of the hour hand in FIG. Pull it to. wire 8
0 is pulled, the swinging arm 58 interlocking with the wire 80 swings about the shaft 62 in the counterclockwise direction of rotation of the hour hand in FIG.
The pressure contact state with respect to 0 is released. In other words, the brake is released. On the other hand, as the lever 26 rotates, the link piece 52 swings about the shaft 54 in the counterclockwise direction of rotation in FIG. When the position is reached, the locking shaft 56 fits into the notch 36. In this state, even if the artist removes his or her foot from the pedal 34, the lever 26 will not release the link piece 52.
Because it is locked to the brake, it does not rise and the brake released state is maintained. Therefore, the drafter should
After releasing the brake, apply force in the vertical direction to the support frame 18 or the drawing board in a free position, and lift the lifting leg member 6.
The height of the drawing board can be adjusted by raising and lowering it along the upright leg members 4. After adjusting the figure board to a desired height position, step on the pedal 46 and lower it. The lever 38 swings about the shaft 40 in the counterclockwise direction of rotation of the hour hand in FIG. Push the link piece 52 to the left. As a result, the engagement between the locking shaft 56 and the notch 36 is released. In this state, when the foot is raised, the lever 26 rises and returns to its original position due to the tensile force of the coil spring 72, and the swinging arm 58 swings about the shaft 62 in the direction of rotation of the hour hand in FIG. And brake shoe 70
and the roller 68 comes into pressure contact with the rail member 10. That is, the elevator leg member 6 is in a braked state.

When the downward pressing force on the pedal 46 is released, the lever 38 swings about the shaft 40 in the direction of rotation of the hour hand in FIG. 2 due to the elasticity of the spring 48, and the pedal 46 returns to its original position. to rise and return.

Place your foot on the pedal 46 and use your foot to press the pedal 4.
By pressurizing the pedal 46 downward, the pedal 46
and 34 are lowered at the same time, the locking shaft 56 is obstructed by the protrusion 42 and does not fit into the notch 36, so in this case, the brake lever operates normally. That is, when the pedal 46 is depressed downward with the foot, the brake is released and the pedal 46 is depressed.
When you take your foot off of 6, the brake will be applied.

Note that, as shown by the dotted line in FIG.
The return is performed by the coil spring 72, and the spring 48 becomes unnecessary.

As is clear from the above explanation, the gist of the present invention is to maintain the brake released state even after the brake is released by stepping on the pedal and the brake is released. Therefore, since various mechanisms can be envisaged based on this technical concept, the present invention is not particularly limited to the illustrated embodiment as a specific mechanism. For example, by using one brake lever, The brake is released by stepping on the pedal for the second time, and this brake released state is maintained even when the brake pedal rises and returns to its original position.The second pedal stepping action releases the brake, that is, the brake is released. It is also good as a structure that can be hung.

Since the present invention is constructed as described above, it is possible to easily operate the drawing board up and down in the operator's preferred posture with the brake released, and it is particularly useful for physically disabled persons as there are restrictions on the operating posture. is large. Moreover, when used on a drafting table without a balance mechanism such as a gas spring, it is extremely convenient to take a position where it is easy to apply force by removing the foot from the pedal. Furthermore, even if the drawing table has a balance mechanism, the position of the pedal may not be appropriate depending on the installation position of the drawing board, such as when the pedal is located at the back of the front end of the drawing board. However, even in such cases, there is an effect such as being able to easily operate the brake, and the engaging member is attached by a spring in the direction in which it engages with the engaging part of the brake operating lever. Since the brake is energized, there are effects such as being able to perform the brake release/holding operation reliably.

[Brief explanation of the drawing]

The figures show a preferred embodiment of the present invention, with FIG. 1 being a perspective view, FIG. 2 being a longitudinal sectional view, and FIG. 3 being a transverse sectional view. 2... Base, 4... Upright leg member, 6... Lifting leg member, 8... Roller, 10, 12, 14... Rail member, 16... Lateral support rod, 18... Support frame, 2
0... Lever, 22... Support plate, 24... Gas spring, 26... First brake operating lever,
28...Plate member, 30...Shaft, 34...Pedal,
36...Notch (engaging portion), 38...Second brake operating lever, 40...Shaft, 42...Protrusion piece, 4
4...Slit, 46...Pedal, 48...Spring, 50...Shaft, 52...Link piece, 54...
Shaft, 56... Locking member, 58... Swinging arm, 60...
...hole, 68...roller, 70...brake shoe,
72...Coil spring, 80...Wire, 88...
Spring member.

Claims (1)

[Scope of utility model registration request] An upright leg member 4 erected on the base 2 and an elevating leg member 6 supported by the upright leg member 4 so as to be able to rise and fall freely.
and a drawing board support frame 1 attached to the elevating leg member 6.
8, a brake operation lever 26 supported at the bottom of the drafting table so as to be movable in the vertical direction with respect to the floor surface; a foot-operated brake pedal 34 attached to the operation lever 26; The brake pedal 34 is connected to the brake pedal 34 .
a brake mechanism that stops the lifting leg member 6 to the upright leg member 4 side when the lifting leg member 6 is in the raised position and releases the restraint when the brake pedal is lowered; When the brake pedal is lowered, the engaging portion 36 formed on the brake operating lever 26 is engaged, and even if the pressure applied to the brake pedal is released, the brake operating lever 26 is moved to the lowered position. A locking member 56 that locks, a spring member 88 that biases the locking member 56 in a direction to engage the engaging portion 36 of the brake operating lever 26, and the engaging portion 36 of the locking member 56. A brake operating device for a drafting table, comprising a brake release/holding state release mechanism for releasing the engagement state against the spring member 88 against the elastic force of the spring member 88.