JPS6227694Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a brake device for lifting legs used for drafting tables, blackboards, etc.

As this type of device, the one shown in Utility Model Publication No. 50-35269 is known.

As shown in FIG. 6, when the handle 2 is rotated and the screw rod 4 is rotated in the tightening direction, the locking rod 6 is pushed in the arrow direction c by the screw rod 4. The tapered surface 6a is press-fitted between the shaft bodies 8 and 10,
The shaft bodies 8 and 10 are moved to A by the pressure of the tapered surface 6a.
- The side walls 8a, 10a of the shafts 8, 10 are pressed against the inner surface of the side wall 12a of the square pipe 12 by being pushed in the direction c, and the square pipe 1
2 is fixed to the shaft bodies 8 and 10. When the handle 2 is rotated in the opposite direction, the square pipe 12 becomes free to slide freely along the shafts 8 and 10. In the above device, when applying the brake, the shafts 8 and 10 are pressed only from one direction c by the tapered surface of the locking rod 6, so that the front and rear surfaces e and f of the shafts 8 and 10 are aligned with the square pipe 12. Before being crimped to the front and rear walls g, h, the side surfaces i, j of the shaft bodies 8, 10 are connected to the square pipes 12.
Crimp the inner surface of the side wall k. Therefore, when applying the brake, the front and rear surfaces e and f of the shaft bodies 8 and 10 and the square pipe 12
A play l occurs between the inner surfaces of the front and rear walls g and h. The elevating legs made of the square pipe 12 and the shafts 8 and 10 have great strength against loads in the direction parallel to the arrangement direction A-B of the shafts 8 and 10. Therefore, the legs should be erected so that the shorter side (m or n) of the cross-sectional shape faces the front of the drawing table, and should have sufficient strength to withstand the load from the drawing board by the drawing user. I'm letting you do it. However, there was a defect in that when a load was applied to the square pipe 12 in the arrow direction A or B, the square pipe 12 moved in the arrow direction A or B with respect to the shafts 8 and 10 due to the presence of the play l. .

The present invention aims to eliminate the above defects.

The configuration of the present invention will be described in detail below based on embodiments shown in the accompanying drawings.

In FIG. 1, 20 is a drafting table, 22 is a horizontal foot lever, and a lower square pipe 24 is erected thereon. 26 is an upper square pipe, to which the upper portions of a pair of shaft bodies 28 and 30 are fixed. A drawing board support frame 32 is attached to the upper part of the square pipe 26. A mechanism for fixing the shaft bodies 28, 30 to the square pipe 26 will be explained with reference to FIGS. 4 and 5. The hollow portions of the shafts 28 and 30 have a rectangular cross section, and the upper portions of the shafts 28 and 30 are fitted into the lower hollow portion of the upper corner pipe 26. Reference numerals 32 and 34 indicate rectangular holes formed through both side walls of the square pipe 26, into which the side surfaces of fastening members 36 and 38 having a rectangular cross-sectional shape are slidably fitted.

Slanted surfaces 40 and 42 are formed on both side surfaces of the member 36 to make the member 36 narrower toward one end. A locking portion 44 perpendicular to the longitudinal direction is formed at the other end of the member 36 in the longitudinal direction.
A screw hole 46 is formed in the member 36 in the longitudinal direction, and one end of the screw hole 46 opens at one end surface of the member 36 in the longitudinal direction. A shaft hole 48 is transparently provided in the tightening member 38 . On both sides of the member 38, there are inclined surfaces 50, 5 that taper the member 38 toward one end.
2 is formed, and the side enlarged portion of the member 38 is slidably fitted into the hole 34. 54 is a bolt, the threaded portion of which is inserted into the shaft hole 48 of the member 38.
The member 36 is slidably inserted into the member 36, and is screwed into a screw hole 46 of the member 36. 56 is a washer slidably inserted into the threaded portion of the bolt 54, 58 is a coil spring, and 59 is a stopper screw.

In the above configuration, when the head of the bolt 54 is rotated in the tightening direction by a rotary tool, the member 38 moves along the bolt 54 in the direction of the member 36, and the opposing interval between the inclined surfaces 50, 52 and 40, 42 is reduced. The corners of the shaft bodies 28, 30 are pressed by the inclined surfaces 50, 52 and 40, 42, and the shaft bodies 28, 3
The front and rear surfaces a perpendicular to these arrangement directions of 0,
b is press-fitted to the inner surfaces of the front and rear walls c, d of the square pipe 26, and the shaft bodies 28, 30 are fixed to the square pipe 26. The portions of the shaft bodies 28 and 30 exposed from the square pipe 26 are slidably fitted into the lower square pipe 24. The longitudinal direction of the cross-sectional shape of the lower square pipe 24, ie, the arrangement direction of the shaft bodies 28 and 30, is set parallel to the side surface of the drafting table. In FIG. 2, reference numerals 60 and 62 indicate rectangular holes bored through the upper portions of both side walls of the square pipe 24, respectively, and the holes 60 and 62 are provided with side surfaces of fastening members 64 and 66 having square cross sections. The ampullae are slidably fitted together. Each side of the members 64, 66 has inclined surfaces 68, 70 and 7 which taper toward one end.
2, 74 are formed, and the inclined surface is connected to the shaft body 28, 30.
facing the corner. A protrusion 76 is formed at one end in the longitudinal direction of the member 64, and the protrusion 76
The vertical surface of 6 faces the side surface of the square pipe 24. The protrusions 76 are formed on the shaft bodies 28, 30 guided by the inclined surfaces 68, 70, 72, 74 when the tightening members 64, 66 are displaced in a direction toward each other due to the rotation of the threaded rod 82. front and rear walls 28
a, 30a are the front and rear walls 24a, 24 of the square pipe 24
It is set so that it comes into contact with the side wall 24c of the opposing square pipe 24 before coming into pressure contact with b. The member 66 has a shaft hole 78 in a direction perpendicular to both end faces.
is transparent. A screw hole 80 is bored in the member 64 along the longitudinal direction, and the screw hole 80 opens at one end surface of the member 64. Reference numeral 82 denotes a threaded rod made of a bolt, to which a handle 84 is fixed, and a protrusion having a pressing surface perpendicular to the longitudinal direction of the threaded rod 82 is formed on the handle 84. A cap screw 90 is screwed into a screw hole in the member 64 and is located near the protrusion 76. The cap of the screw 90 prevents the member 64 from coming out of the hole 60 when the member 64 is in a free state. It is prevented.

As shown in FIG. 2, the side wall 24d of the square pipe 24 has a so-called bead 2 with a raised connection surface.
4e is formed. The tightening member 66 is attached to a hole 62 in the side wall 24d in which the bead 24e is formed.
It is inserted and placed in. The tightening members 64, 66
The slopes of the inclined surfaces 68, 70 and 72, 74 are set to have substantially the same slope so that the shaft bodies 28, 30 move in the A-B direction without changing the angle due to their pressing force. There is.

Next, the operation of this embodiment will be explained.

When the screw rod 82 is slidably inserted into the shaft hole 78 of the tightening member 66 and the handle 84 is further rotated to screw the screw rod 82 into the screw hole 80 of the member 64, the member 64 is inserted along the screw rod 82. The member 66 is pushed toward the member 66, causing the clamping members 64 and 66 to move closer together.

When the distance between the members 64, 66 narrows, the shafts 28, 30 are pushed apart in the A-B direction by the pressure from the inclined surfaces 68, 70 and 72, 74, and the shafts 28, 30 are expanded. The front and rear walls 28a, 30a first lightly abut against the front and rear walls 24a, 24b of the square pipe 24. At this time, the front and rear walls 28a, 30a of the shaft bodies 28, 30 are still strongly connected to the front and rear walls 28a, 30a of the square pipe 24.
The vertical surface of the protrusion 76 comes into contact with the outer surface of the side wall 24c of the square pipe 24 before coming into pressure contact with the inner surface of the side wall 24c of the square pipe 24. That is, the tightening member 64 is locked to the side surface of the square pipe 24. If the handle 84 is still rotated in the tightening direction in this state, only the tightening member 66 moves in the arrow direction c while the tightening member 64 remains stationary. By this movement of the tightening member 66 in the arrow direction c, the side surfaces of the shaft bodies 28 and 30 are attached to the side wall 24 of the square pipe 24.
c Pressed onto the inner surface, and the front and rear walls 2 of the shaft bodies 28 and 30
8a, 30a are the front and rear walls 24a of the square pipe 24,
It is crimped onto the inner surface of 24b. With this, the shaft body 2
8 and 30 are fixed to the square pipe 24. At this time, a gap G is created between the other side surfaces of the shaft bodies 28 and 30 and the inner surface of the side wall 24d of the square pipe 24, thereby preventing the bead 24e and the side surface of the shaft body 28 from coming into pressure contact with each other. be able to. In addition, the above interval G
is the side wall of the square pipe 24 that the protrusion 76 faces,
It is formed between the opposite side wall and the opposing shaft. When the handle 84 is rotated in the opposite direction and the screw rod 82 is retreated from the screw hole 80, the pressing force of the protrusion pressing surface of the handle 84 against the other end surface of the member 66 is released, and the gap between the members 64 and 66 is widened. As a result, the pressing state of the inclined surfaces 68, 70, 72, 74 against the corners of the shaft bodies 28, 30 is released, and the shaft bodies 28, 30 can freely slide along the longitudinal direction of the square pipe 24. can. In the above embodiment, the holes 62 and 60 have a rectangular shape, and the members 64 and 66 have a rectangular cross-sectional shape because
The purpose is to prevent rotation of the members 64, 66 relative to the holes 60, 62. Therefore, if a rotation stopper mechanism for the members 64, 66 is provided separately, it is not necessary to make the hole 6062 square and to make the cross-sectional shape of the members 64, 66 square. Further, the square pipe 24 may be configured as a sliding lifting leg, and the shaft bodies 28 and 30 may be configured as fixed legs.

As mentioned above, in the present invention, during braking, a pair of shaft bodies is pressed in a direction in which they are spread apart from two directions by a pair of tightening members having sloped surfaces, so that the shaft bodies of the square pipe are perpendicular to the direction in which the shaft bodies are arranged. The shaft body can be crimped to the front and rear wall surfaces of the square pipe, and play between the shaft body and the square pipe in the direction in which the shaft bodies are arranged can be removed. Since a locking part is provided that comes into contact with the shaft, one side of the shaft can be crimped to one side wall of the square pipe, which has the effect of firmly fixing the shaft and the square pipe. exists.

[Brief explanation of the drawing]

Figure 1 is a side view of the drafting table, Figure 2 is a cross-sectional view,
FIG. 3 is a longitudinal sectional view, FIG. 4 is a cross-sectional view of the leg, FIG. 5 is a longitudinal sectional view of the leg, and FIG. 6 is a cross-sectional view of the conventional design. 24... Lower corner pipe, 26... Upper corner pipe, 28, 30... Shaft body, 58... Coil spring, 60, 62... Hole, 64, 66... Tightening member, 68, 70, 72, 74... Inclined surface, 76...
...Protrusion, 78...Shaft hole, 80...Screw hole, 82...
...screw rod, 84...handle.

Claims (1)

[Scope of utility model registration request] Shaft bodies 28 and 30 having a rectangular cross section and facing each other so as to be movable in the approaching and separating directions are loosely fitted into the square pipe 24 so that both can be slid relative to each other. Holes 60, 62 are provided in both side walls parallel to the arrangement direction of the shaft bodies 28, 30, and tightening members 64, 66 are inserted into the holes 60, 62 in a direction perpendicular to the longitudinal direction of the square pipe 24. The tightening members 64, 66 are disposed between the shaft bodies 28, 30, and the tightening members 64, 6 are movably fitted into each other.
Slanted surfaces 68, 70, 72, 74 having substantially the same slope as each other and narrowing the tightening members 64, 66 toward the tips are provided on the side faces facing the shaft bodies 28, 30 of No. 6.
A shaft hole 78 is provided in one of the tightening members 64 and 66, and a threaded rod 82 to which a handle 84 is fixed is slidably inserted into the shaft hole 78. The screw rod 82 is attached to the tightening members 64 and 66.
The tightening members 64, 66 are screwed into screw holes 80 drilled in the other member 64, and the tightening members 64, 66 are screwed together.
The inclined surfaces 68, 70, 72, 74 of the shaft body 2
The shaft bodies 28, 30 are pressed against the corners of the shafts 28, 30.
The front and rear walls 28a, 3 perpendicular to the arrangement direction of the
0a side, the shaft bodies 28, 3 of the square pipe 24
Front and rear walls 24a, 24 perpendicular to the arrangement direction of 0
(b) so that it can be pressed parallel to the inner surface, and
Before the front and rear walls 28a, 30a of the shaft bodies 28, 30 come into pressure contact with the inner surfaces of the front and rear walls 24a, 24b of the square pipe 24, one of the clamping members 64, 66 is pressed against the front and rear walls 24a, 30a of the square pipe 24. 24. A lifting leg brake device for a drafting table or the like, characterized in that a protrusion 76 is provided on the one tightening member 64 facing the side surface of the square pipe 24 so as to be locked on the side surface of the square pipe 24.