JPH07984Y2 - Lifting device on the drafting table - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an elevating device in a drafting table that facilitates raising and lowering of a drawing board, and particularly to a drafting table capable of coping with load changes. The present invention relates to a lifting device.

[Prior Art] A drawing board and a drawing machine placed on a drafting table have a considerable weight, and this weight and the weight of the drawing board frame and the movable prop of the drawing board are added to each other when the drawing board is moved up and down. A great deal of labor is required to raise and lower the removed items.

Therefore, there is a fixed column in which a gas spring using a gas cylinder is installed, and the movable column is urged upward to reduce the operating force when moving up and down.

Also, in a drafting table in which a pair of fixed columns and movable columns are arranged on the left and right, a gas spring is installed in either one of the left and right fixed columns, and pulleys and wires or gears are used on the left and right movable columns. It is known that a synchronous mechanism is provided, and a single gas spring imparts upward elasticity to the left and right movable columns to facilitate the lifting operation.

[Problems to be Solved by the Invention] Normally, a gas spring is not provided with an elastic force adjusting means, and an appropriate elastic force is selected and used from a plurality of types having different elastic forces set. On the other hand, the weight of the drawing board and the drafting machine is not constant, and in particular, the drawing board is remarkably different in weight depending on its size and material. Therefore, it is difficult for the gas spring to support a plurality of types of drawing boards, and when a small drawing board is placed on a drafting table that is set to have appropriate elasticity for a large drawing board, Is excessively urged to lower the ease of lowering operation. or,
On the other hand, when a large drawing board is used for the drafting table set for a small drawing board, the elasticity is insufficient and the desired elastic action cannot be obtained.

Therefore, it becomes necessary to adapt the elasticity of the gas spring to the weight of the drawing board to be used, but the work of replacing the gas spring with an appropriate one is complicated, and it is also necessary to use multiple types of gas springs. The preparation causes problems such as an increase in inventory at the manufacturing stage and an increase in the burden on the purchaser.

Therefore, there is a technical problem to be solved in order to provide a lifting device having versatility that does not require replacement of the gas spring and can obtain appropriate elasticity corresponding to various drawing boards. The present invention aims to solve the problem.

[Means for Solving the Problems] The present invention is proposed to achieve the above-mentioned object, and includes a pair of left and right fixed columns 5 and 6, and is vertically inserted into the fixed columns 5 and 6 to be freely movable. The movable support columns 7 and 8 and the drawing board frame 19 pivotally attached to the upper portions of the movable support columns 7 and 8 are used for the gear or the pulley 1.
The left and right movable columns 7 and 8 are interlocked by a synchronization mechanism 11 including the wires 2 and 13 and the wires 14 and 15, and a gas spring 22 is interposed between one of the fixed columns 6 and the movable column 8.
In the drafting table 1 in which 8 and the drawing plate frame 19 are urged upward to facilitate the raising and lowering operation, the coil spring 28 is interposed between the other fixed strut 5 and the movable strut 7, and the other one. The fixed coil 5 or the movable coil 7 of the coil spring 28
An elevating device for a drafting table is provided, which is provided with an elastic force adjusting mechanism 33 capable of changing the compression length of the.

[Operation] The left and right movable columns are interlocked by a synchronization mechanism, and are urged in the upward direction by a gas spring interposed between one fixed column and the movable column. A coil spring is interposed between the other fixed strut and the movable strut, and an elastic force adjusting mechanism capable of pressing the end portion of the coil spring to compress the movable strut or the fixed strut is provided. The rising force applied to the left and right movable columns is a combined force of the elastic force of the gas spring and the elastic force of the coil spring, and the elastic force of the coil spring is adjustable. An appropriate elasticity can be obtained according to the weight of the machine. Therefore, if the adjustment is properly performed, the elastic plate elastically raises the drawing board when it is raised, and the operation force is reduced as much as possible when the operator manually lowers it.

[Embodiment] An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. For convenience of description, technical matters that are conventionally known will be described at the same time. In FIG. 1, 1 is a drafting table, 2 and 3 at the lower left and right ends are leg parts, 4 is a lower connecting pipe connecting the leg parts,
Reference numerals 5 and 6 are fixed columns fixed to the lower connecting pipe 4. Movable struts 7 and 8 are loosely inserted into the fixed struts 5 and 6 from the upper end openings thereof, and vertically slid by guide roller portions 9 and 9 mounted on the outer peripheral surfaces of the movable struts 7 and 8. Can be made.
The left and right movable columns 7, 8 are connected by the upper connecting pipe 10,
A synchronization mechanism 11 is incorporated in the upper connecting pipe 10.

The synchronizing mechanism 11 includes pulleys 12 and 13 axially mounted near the left and right ends of the upper connecting pipe 10 and wires 14 and 1 wound around the pulleys 12 and 13.
Composed of 5 and. One end of the wire 14 is attached to the upper end plate 16 of the movable column 7 on the left side in FIG.
It is wound around the lower surface of the left pulley 12 and hung on the upper surface of the right pulley 13, and the other end portion 14b is locked to the lower portion of the right movable column 8. Further, the other wire 15 has one end 15a attached to the upper end plate 17 of the right movable support column 8 symmetrically with the wire 14 and hung on the lower surface of the right pulley 13 and wound on the upper surface of the left pulley 12. The other end 15b is fixed to the lower part of the left movable column 7 by being turned.

Therefore, the movement amounts of the wires 14 and 15 accompanying the up and down movement of the left and right movable columns 7 and 8 are synchronized by the pulleys 12 and 13, and the movable columns 7 and 8 are coupled to each other by the wires 14 and 15. Therefore, it can move up and down smoothly in conjunction with each other.

A drawing board frame support portion 18 is disposed on the upper ends of the movable columns 7 and 8, and a drawing board frame 19 is pivotally attached to the drawing board frame support portion 18 so as to be rotatable in the front-rear direction, and an inclination angle adjusting lever 20 is provided. The board frame 19 can be fixed at an arbitrary angle by the brake operation. In addition, 21 is a drawing board frame 19
It is a drawing board placed on.

As shown in FIG. 2, a gas spring 22 is provided in each of the right fixed column 6 and the movable column 8. The end of the cylinder 23 of the gas spring 22 is the upper end plate of the movable support column 8.
17 and the piston rod 24 at the lower end is held by the locking portion 25 below the fixed column 6, and the lock operating rod 26 projecting from the tip of the piston rod 24 is projected on the lower surface of the locking portion 25. There is. The lock operation rod 26 is a fixed column 6.
Is in contact with the upper surface of the rear portion of the operation pedal 27 pivotally mounted near the lower end of the operation pedal 27, and by depressing the front portion of the operation pedal 27, the lock operation rod 26 is pushed up and the gas spring
The fixation of the cylinder 23 and the piston rod 24 of 22 is released, and the movable columns 7 and 8 and the drawing board frame 19 are raised. And
When the pedaling pressure of the operation pedal 27 is released, the piston rod 24 is fixed to the cylinder 23, and the drawing board frame 19 can be set to a desired height.

When lowering the drawing board frame 19, the operation pedal 27 is depressed, and the drawing board frame 19 and the movable columns 7 and 8 are pushed down against the bias of the gas spring 22 to a desired height, and the operation pedal 2
It is enough to release the pedaling pressure of 7.

On the other hand, a coil spring 28 is interposed between the fixed column 5 and the movable column 7 on the left side in FIG. The shaft 30 of the lead screw 29 is loosely fitted to the upper end plate 16 of the fixed column 5, and the shaft 30
The hexagon nut portion 31 at the end portion can be projected upward and the lead screw 29 can be rotated by an operating tool such as a wrench. A spring receiving plate 32 is screwed onto the lead screw 29 to form an elastic force adjusting mechanism 33, and the coil spring 28 is pinched by the spring receiving plate 32 and the bottom of the fixed column 5. The spring receiving plate 32 is provided with a protrusion 34 having the same inner diameter as that of the coil spring 28 on the lower surface to position the coil spring 28. Reference numeral 35 denotes a guide tube provided upright in the fixed support column 5 to prevent the coil spring 28 from being exposed to the left and right.

As shown in FIG. 3, a guide pin is provided on the upper surface of the spring receiving plate 32.
While 36 is fixed, the back side of the movable column 7 (left in the figure)
The guide pin 36 is loosely fitted in a guide hole 37 having a long hole opened in the vertical direction. Therefore, when the lead screw 29 is rotated, the spring receiving plate 32 is prevented from rotating by the guide pin 36 and the guide hole 37, and the lead screw 29 is rotated.
It moves up or down along the screw portion 38 of the. Then, as shown by the solid line in the figure, when the guide pin 36 of the spring receiving plate 32 is set so as to be positioned at the upper end portion of the guide hole 37, the elasticity of the coil spring 28 is low and the movable support columns 7 and 8 are moved upward. The pressure to urge to is also small.

On the other hand, when the lead screw 29 is rotated to lower the spring receiving plate 32, the coil spring 28 is compressed and the elasticity is increased, and the coil spring 28 can be lowered to the position shown by the chain line in the figure. Therefore, by appropriately setting the spring constant of the coil spring 28, for example, the elastic force can be freely set between 5 kgf and 10 kgf, and if the elastic force of the gas spring 22 is 30 kgf, a total elastic force of 35 kgf to 40 kgf can be obtained. it can.

Then, the drawing board 21 and the drawing machine (not shown) are provided on the drawing board 1.
Is installed, and when the operation pedal 27 is stepped on, the lead screw 29 is adjusted by rotating so that the movable columns 7, 8 rise smoothly and gently. Further, if a scale corresponding to the elasticity is provided near the side edge of the guide hole 37, the elasticity can be visually observed from the position of the guide pin 36, and the adjustment can be performed quickly and easily based on the weight of the drawing board 21 and the drafting machine. It can be carried out. Furthermore, the scale is further simplified by displaying the elasticity and the size and type of the drawing board 21 in correspondence with the elasticity display.

It should be noted that the present invention should not be limited to the above-described embodiment, but various modifications such as disposing the elastic force adjusting mechanism 33 on the fixed support column 5 side can be made. It goes without saying that it extends to all things.

[Effects of the Invention] As described in detail in the above-mentioned one embodiment, this invention can increase or decrease the rising force of the movable column, so that the optimum elasticity can be obtained according to the weight of the drawing board which is different depending on the size and the material. You can
Operability is improved. Furthermore, it is not necessary to replace the gas spring with an appropriate elasticity according to the load of the drawing board, and it is not necessary to prepare multiple types of gas springs. It is a device of practical value that reduces the burden on the purchaser at the purchase stage.

[Brief description of drawings]

1 is a partially cutaway front view of the drafting table, and FIG. 2 is A of FIG.
FIG. 3 is a sectional view taken along the line A-A of FIG. 3, and FIG. 3 is a view taken along the line B-B of FIG. 5,6 …… Fixed column 7,8 …… Movable column 11 …… Synchronizing mechanism 12,13 …… Pulley 14,15 …… Wire 19 …… Plate frame 22 …… Gas spring 28 …… Coil spring 33 …… Elasticity adjustment mechanism

Claims (1)

[Scope of utility model registration request] 1. A pair of left and right fixed columns 5 and 6, and the fixed columns 5 and 6.
Movable columns 7 and 8 that are freely inserted into the
It consists of a drawing board frame 19 pivotally attached to the upper part of the, and the left and right movable struts 7, 8 are interlocked by a synchronizing mechanism 11 by gears or pulleys 12, 13 and wires 14, 15 In the drafting stand 1 in which the gas spring 22 is interposed between the supporting column 8 and the movable supporting columns 7 and 8 and the drawing plate frame 19 to facilitate the lifting operation, the other fixed supporting column 5
And a movable strut 7 with a coil spring 28 interposed, and the other fixed strut 5 or the movable strut 7 is provided with an elastic force adjusting mechanism 33 capable of changing the compression length of the coil spring 28. Lifting device in.