JPS5822577Y2 - Clamp device for drawing boards on drafting tables, etc. - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a clamping device for a drawing board, etc., which can adjust the inclination angle of a drawing table, etc.

For example, a conventional drafting table is as shown in FIG. 1 (but without the spring 5), and when changing the angle of the drawing board 1, one end 1a of the drawing board 1 is turned while the clamp lever 3 is turned toward the release side. It was necessary to change the angle by pushing down or pulling up, and then turn the clamp lever 3 toward the clamp side.

The present invention simplifies the above operation and allows the clamping device to work automatically.

The present invention will be explained in detail below using embodiments shown in the drawings.

In FIG. 1, a drawing board 1 is fixed to the upper surface of a drawing board holder 7,
As will be described later, the drawing board holder 7 can rotate around the support shaft 2 to tilt the drawing board 1 to an arbitrary inclination angle.

The support shaft 2 is fixed to a vertical shaft 9, and this vertical shaft 9 is connected to the leg 8.
It is inserted into the guide hole (not shown), moves up and down, and is locked in any position.

In FIGS. 2, 3, and 4, a pair of bosses 4 are fixed to the drawing plate holder 7, and the bosses 4 have a cut-in portion 4b that reaches a boss hole 4a through which the support shaft 2 is inserted. There is a screw hole 4C on the top side, and a hole 4d on the bottom side that connects to the screw hole 4C, into which the bolt 10 is screwed. 1
By tightening 0, the boss hole 4a of the boss 4 is tightened.
The drawing board 1 is clamped by fastening the boss 4 to the support shaft 2.

A base lever 11.11 is further fixed to the above-mentioned pole 10.10, and the tip of this base lever 11.11 is pivotally attached to both ends of the link par 6 to form a link mechanism.

Further, a crank lever 3 is fixed to one of the base levers 11, and by turning the Clary Preparator 3 around the base lever 10, both poles 10.
10 simultaneously tighten and loosen the bosses 4 and 4, respectively.

A spring 5 is stretched between the ring par 6 and the drawing board holder 7, and the elasticity of this spring causes the bolts 10, 10 to be tightened and the drawing board 1 to be clamped.

Next, the operation will be explained.

In FIG. 2, the clamp lever 3 is rotated to the right by the elasticity of the spring 5, and the drawing board 1 is clamped.

Next, when the clamp lever 3 is rotated to the left, the clamp is released, so that the bosses 4, 4 are moved relative to the support shaft 2.
It is rotatable and the angle of the drawing board 1 can be changed.

When the clamp lever 3 is released, the clamp lever 3 is rotated to the right by the elasticity of the spring 5, and the drawing board 1 is clamped.

That is, while rotating the clamp lever 3 to the left, move the drawing board 1.
When the inclination angle is set and the clamp lever 3 is released at that position, the clamp lever 3 is rotated to the clamp position by the elasticity of the spring 5, and the drawing board 1 is automatically clamped.

According to the present invention, as mentioned above, an interruption is provided in the boss hole of the drawing board holder into which the support shaft is inserted, and by tightening and loosening this interruption with a bolt, the drawing board can be clamped or clamped against the support shaft. At the same time, a spring is installed between the clamp lever fixed to the bolt and the drawing board holder, and this spring tightens the bolt and automatically clamps it, so there is no possibility of incomplete clamping when adjusting the inclination angle of the drawing board. This eliminates the risk of the drawing board falling over, making it easier to operate and extremely safe.

In addition, in this invention, the force of the spring is made sufficiently strong,
By making sure that a considerable amount of frictional force remains between the boss and the spindle even when the clamp lever is turned to the release position, the drawing board will not suddenly turn when you turn it by hand. Become even safer.

[Brief explanation of drawings]

FIG. 1 shows the entire drafting table according to the present invention, and FIG. 2 is a plan view of the clamp mechanism. FIG. 3 is an A'-A2 sectional view, and FIG. 4 is a front view. 1...Drawing board, 2...Spindle, 3...
... Clamp lever 4 ... Boss, 7 ...
・Drawing board holder, 10... bolts.

Claims (1)

[Scope of utility model registration request] In a drafting table or the like in which a drawing board is rotatably supported on a support shaft horizontally suspended on the legs, the boss of the drawing board holder to which the drawing board is attached is inserted into the support shaft, an interruption is provided in this boss, and the above-mentioned interruption is inserted. A screw hole is made on one side and a blank hole on the other side, and a tightening bolt is screwed into this to enable clamping and unclamping with the drawing board as a support shaft, as well as a clamp lever fixed to the tightening bolt. A clamping device for a drawing board of a drafting table, etc., characterized in that a spring is stretched between - and a drawing board holder.