JPH0517941Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a lifting device for a drafting table equipped with a rail-type adjustable parallel ruler.

[Conventional technology]

This type of drafting table has a gas coupling placed between the left and right telescopic support legs to urge the drawing board support frame upward, and the locking and unlocking of this gas spring is done by means of the left and right telescopic support legs. This is done by operating the foot brake lever located between the bottom parts with your foot.

[Problem that the invention attempts to solve]

In the conventional device described above, since the foot brake lever is disposed between the lower portions of the left and right telescoping support legs, the space between the telescoping support legs becomes complicated, and there is a drawback that the artist cannot freely extend his or her legs. Another drawback is that when raising and lowering the drawing board, it is cumbersome to reach the telescopic support leg and operate the foot brake lever.

The present invention aims to eliminate the above defects.

[Means to solve problems]

In order to achieve the above object, the present invention provides support cylinders 22, 24 that are erected approximately midway between a pair of left and right elongated floor-mounted members 36, 38 that are parallel to each other, and support cylinders 22, 24. A pair of left and right telescopic support legs 1 consisting of movable cylindrical bodies 26 and 28 that are vertically movably inserted into the support legs 1.
8, 20, a drawing board 2 attached to the upper part of the telescopic support legs 18, 20 via a drawing board support frame, a rail type flexible parallel ruler attached to the drawing board 2, and the left movable cylinder. 26 to the right movable cylinder body 28, the device includes a cylinder portion 50b in the left telescopic support leg 18, a piston rod portion 50a slidable relative to the cylinder portion 50b, and the piston rod portion. 50a
A gas spring 50 having a push rod 56 for locking and unlocking the cylinder portion 50b is arranged, the upper end of the gas spring 50 is engaged with the left movable cylinder 26, and a foot pedal is mounted on the left floor mounting member 36. 52 is pivotally supported so as to be able to swing freely, and the foot pedal portion of the foot pedal 52 is exposed on the front side of the left floor mounting member 36, and the displacement portion of the foot pedal 52 is connected to the push rod 56.
It was made to face.

[Effect]

In the above configuration, when the foot pedal 52 is stepped on, the push rod 56 is pushed by the displaced portion of the foot pedal 52, and the gas spring 50
The piston rod portion 50a is unlocked from the cylinder portion 50b, and the movable cylinders 26, 28
can be raised and lowered with respect to the support cylinders 22 and 24, and the drawing board 2 can be adjusted up and down.
When the foot pedal 52 is released, the push rod 56 returns to its original protruding position due to the elastic force acting on it, and the piston rod portion 50
a is fixed to the cylinder part 50b, and the movable cylinder body 2
6 and 28 are locked to the support cylinders 22 and 24.

〔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 drawing board fixed to a drawing board support frame (not shown), on which a horizontal rail-type flexible parallel ruler consisting of a horizontal rail 4, a vertical rail 6, an operating head 8, and scales 10 and 12 is mounted. Rail 4 is fixed. Also, on the left side of the drawing board 2, there is a lighting fixture 14.
arm is fixed via a vise-type fixture 16. A pair of left and right telescopic support legs 18 and 20 are provided below the drawing board support frame. Telescopic support leg 1
8 and 20 are support cylinders 22 and 24 having a substantially rectangular cylinder shape;
It consists of movable cylindrical bodies 26 and 28 having a substantially rectangular cylindrical shape and fitted into the support cylindrical bodies 22 and 24 so as to be able to move up and down. The drawing board support frame is rotatably attached to the upper end portions of the movable cylinders 26, 28.
It is configured to move up and down together with 8. 30
is a horizontal connecting member, and both ends thereof are fixed to the upper portions of the support cylinders 22 and 24. At the upper end portions of the left and right support cylinders 22, 24 and on the opposing surfaces thereof, a pair of left and right rotating bodies 32, 3 made of pulleys or the like are provided.
4 are provided. Note that the support cylinders 22, 24
A vertically long floor mounting member 36 for stability is provided at the lower end of the
38 are installed in the front and rear horizontal direction.

The support cylinders 22 and 24 are supported by the floor support member 3
6, 38. Thus, there is a mid-way portion 40 between the telescopic legs 18, 20.
The rotating body 3 passes through the rotating bodies 32 and 34.
A pair of linear members 42, 44 such as wires or ropes are hooked around the ends of the wires 2, 34 and are arranged in a substantially horizontal Z-shape. As shown in FIG.
4, one end 46 is attached to the upper half of one movable cylinder 26, the other end 48 is attached to the lower half of the other movable cylinder 28,
The left telescopic support leg 18 has
The gas spring 50 is provided with a piston rod portion 51 and a gas spring 52.
0a is at the lower end of the support cylinder 22, and the cylinder portion 50
3 and 4, a foot pedal 52 is rotatably supported on a shaft 54 on the side wall of the left floor support member 36, and a foot pedal member 52a is fixed to one end of the pedal 52. The other displacement portion faces a known push rod 56 of the gas spring 50. The push rod 52 is
6 is a piston rod portion 50a and a cylinder portion 50
When the push rod 56 is pushed against its elastic force, the piston rod portion 50a of the cylinder portion 50b is pushed inward.
The gas spring 5 is released from the fixed position.
The overall length of 0 can now be adjusted.
As a result, the drawing board 2 can be set at a predetermined height. When the pressing force on the push rod 56 is released, the push rod 56 returns to its original position by the elastic force acting in the protruding direction, and the piston rod portion 50a is locked by the cylinder portion 50b, so that the height of the drawing board 2 is fixed. To briefly explain the guide mechanism when the movable cylinders 26, 28 are raised and lowered, as shown in Figs. 1 and 6, a plurality of guide balls 58, a ball holding portion 60 which holds the guide balls 58 in a rotatable manner, and a set of four linear rail members 62 which guide the guide balls 58 in the up and down direction while pressing them are disposed on the front and rear sides of the movable cylinders 26, 28, respectively. Both ball holding portions 60 are integrally formed to form a U-shaped cross-section member. The linear rail members 62 are disposed on the front and rear sides of the movable cylinders 26, 28, respectively.
The support members 6 and 28 are fixed to the mounting members 64 provided in the vertical direction along the support cylinders 22 and 24, respectively.

As shown in FIG. 7, the rotating bodies 32 and 34 are attached to a bracket 66 fixed to the support cylinder 24, and are rotatable about a pivot shaft 68. The rotating body 34 has two circumferential grooves 70, 70, and the intermediate portions of the wire members 42, 44 are guided in the circumferential grooves 70, 70.
2 and 44 have each been turned about 90 degrees. The illustrated virtual line 72 is a cover for covering the wire members 42 and 44, and is attached to the horizontal connecting member 30.
Note that the rotating body 34 is not shared, and each linear member 42, 4
It is also preferable to provide separate rotating bodies (not shown) for each of the four rotating bodies.

One end of the wire members 42, 44 is connected to the movable cylinders 26, 28.
To attach it to the upper half of the
The fastening piece 74 is attached to the side surface of the movable cylinder bodies 26 and 28, and the screw member 76 is inserted into the through hole of the fastening piece 74.
, insert one end of the wire material 42, 44 into the hole at the bottom of the screw member 76, and then caulk the part. 78 is a nut member for adjustment and locking. It is sufficient to simply fix the other ends of the wire members 42, 44. In addition, the movable cylinder body 2
The stopper that determines the upper limit position of 6 and 28 is omitted from illustration.

The drawing board 2 rises due to the elastic force of the gas spring 50, and as shown in FIG.
When the movable cylinder 28 rises a predetermined height distance L, the other movable cylinder 28 simultaneously rises to the same height distance L via a wire member 42 whose one end is fixed to the upper half of the one movable cylinder 26.
only rises. Therefore, when rising, one movable cylinder 26 will not rise in advance of the other movable cylinder 28 due to, for example, a difference in rising resistance. At the same time, during this rise, the 10th
As shown in the figure, a wire member 44 whose one end is fixed to the upper half of the other movable cylindrical body 28 acts, and the other movable cylindrical body 28 is moved by a small height distance S for some reason. Even if one of the movable cylinders 26 attempts to rise in advance, the other movable cylinder 26 simultaneously moves up by the same height distance S, so both movable cylinders 26 and 28 maintain the same height. In this way, the pair of wire members 42 and 44 work together to make the moving directions and distances of both the movable cylinders 26 and 28 the same.

The mechanism described above constitutes a synchronization mechanism that transmits the vertical movement of the left movable cylinder 26 to the right movable cylinder 28, but this synchronization mechanism may use other known synchronization mechanisms. However, the present invention is not limited to the specifically illustrated synchronization mechanism.

As mentioned above, in this invention, the foot pedal is placed on the floor-mounted member on the left side, so a space is created between the telescopic support legs, where you can freely extend your feet, and a rail-type flexible parallel ruler is installed. The center of gravity of the drawing board is on the left side, but since the gas spring is placed on the side where the center of gravity is, the drawing board can be adjusted up and down without difficulty.
Since the foot pedal is located at the front, the gas spring can be easily locked and unlocked.

[Brief explanation of drawings]

Fig. 1 is a sectional front view of main parts, Fig. 2 is an overall external view, Fig. 3 is a sectional view, Fig. 4 is a sectional view, Fig. 5 is a partially sectional plan view, Fig. 6 is a sectional view, 7 is a partially sectional plan view, FIG. 8 is an enlarged front view, FIG. 9 is an explanatory view, and FIG. 10 is an explanatory view. 2...Drawing board, 4...Horizontal rail, 6...Vertical rail, 8...Operation head, 10, 12...Scale, 14...Lighting equipment, 16...Vise type fixture,
18, 20... Telescopic support leg, 22, 24... Support cylinder, 26, 28... Movable cylinder, 30... Horizontal connection member, 32, 34... Rotating body, 36, 38... Floor mounting member , 40... midway part, 42, 44... wire material, 50... gas coupling, 50a... piston rod part, 50b... cylinder part, 52... foot pedal, 54... shaft, 56... push rod, 58 ... Guide ball, 60 ... Ball holding part, 62
...Rail member, 64...Mounting member, 66...Bracket, 68...Shaft, 70...Peripheral groove, 74...
Fastening piece, 76... screw member, 78... nut member.

Claims (1)

[Scope of utility model registration request] A pair of left and right elongated floor mounting members 3 parallel to each other
Support cylinders 22, 2 erected approximately in the middle of 6, 38
4, a pair of left and right telescopic support legs 18, 20 consisting of movable cylinders 26, 28 which are vertically movably inserted into the support cylinders 22, 24, and a drawing board support on the upper part of the telescoping support legs 18, 20. Drawing board 2 attached via a frame
, a rail-type flexible parallel ruler attached to the drawing board 2 , and a synchronization mechanism that transmits the vertical movement of the left movable cylinder 26 to the right movable cylinder 28 . Telescopic support leg 18
A gas spring 50 having a cylinder portion 50b, a piston rod portion 50a that is slidable relative to the cylinder portion 50b, and a push rod 56 for locking and unlocking the piston rod portion 50a with respect to the cylinder portion 50b is disposed within the gas spring 50.
The upper end of the foot pedal 52 is engaged with the left movable cylinder 26, the foot pedal 52 is swingably supported on the left floor mounting member 36, and the foot pedal 52 is attached to the left floor mounting member 36. expose it to the front side of
A drawing table elevating device characterized in that a displacement portion of the foot pedal 52 is opposed to the push rod 56.