JPS5840898Y2 - drafting table - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a drafting table.

Conventionally, as a drafting table, for example, the front end of a drafting board support frame is tiltably pivoted on a support stand, and one end of left and right support rods are attached to both sides of the moving part between the rear ends of the drafting board support frame. It is known that the drafting board support frame can be held at a desired inclination angle by pivoting the support rods and selectively fixing appropriate positions on the other end of the support rods to predetermined positions on the support base.

However, in this type of drafting table, the weight of the drafting board support frame and the drafting board mounted on the support frame acts as a force that tilts the support frame backward, so that the support rod This has the disadvantage that a relatively large force is applied and unnecessary effort is required when adjusting the inclination of the support frame.

Therefore, as a means to eliminate such a drawback, for example, a gas spring is provided between the drawing board support frame and the support stand, one end of which is pivotally connected to the drawing board support frame, and the other end attached to the support stand. It is conceivable that the drawing board support frame be pivoted and inserted, and the drawing board support frame may be biased in the upright direction by the expansion force of the gas spring, thereby offsetting the moment due to the weight of the drawing board, etc.

However, although levers can provide a normal balance for a particular drawing board and allow you to adjust the inclination of the drawing board with minimal effort, they do not allow you to change the size of the drawing board. , when replacing the drawing machine mounted on the drawing board with a different type, or when appropriately attaching or removing lighting equipment to the rear edge of the drawing board, it is necessary to maintain the desired balance state. The problem is that it cannot be done.

This invention was made in view of the above circumstances, and includes a pivot point of the drawing board support frame to the support stand, a pivot point of the gas spring to the drawing board support frame, and a pivot point of the gas spring to the support stand. Focusing on the fact that the points form a triangle, the above-mentioned problem can be easily solved by making it possible to move and adjust the pivot point between the gas spun tongue and the support base among these three pivot points. It provides a drafting table that can be used.

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is a support stand.

The support stand 1 has left and right lower supports 3, 3 erected on left and right leg members 2, 2 placed on the floor, and these left and right leg members 2, 2 and the left and right lower supports 3, 3 are integrated.

The lower supports 3, 3 are, for example, shaped like prismatic pipes, and the upper end openings of the lower supports 3, 3 are provided with an upper support 4 that is also shaped like a prismatic pipe.
, 4 are fitted in a protrusively retractable manner, and beam-shaped brackets 5, 5 each having a U-shaped cross section are projecting parallel to the front from the front surface of the upper end of the upper support columns 4, 4.

Then, both sides of the front end of the drawing board support frame 7 are pivotally attached to the upper ends of the brackets 5, 5 via U-shaped brackets 6.6, and the drawing board support frame 7 is adjusted as appropriate using the inclination angle adjustment device 8. It can be held in an inclined position.

The drawing board support frame 7 is, for example, in the form of a rectangular frame made of pipe materials, and supports the rear end of a drawing board (not shown) at the rear ends of left and right side rods 7a, 7a. Auxiliary side rod 7b,
Drawing boards of various sizes can be mounted on the drawing board support frame 7 by fitting the drawing boards 7b in a retractable manner.

Further, the inclination angle adjusting device 8 includes, for example, one end of the support rods 9, 9 pivotally attached to the center portion of the side rods 7a, 7a of the drawing board support frame 7, and the other end of the support rods 9, 9 the upper support 4,
The guide member 10 is slidably fixed to the guide member 10 which is pivotally connected between the guide members 10 and 4.

Further, a gas spring 11 is inserted between the brackets 5, 5 of the support stand 1 and the drawing board support frame 7.

The gas spring 11 has a piston rod 11b at one end of the cylinder 11a, and the piston rod 1 is expanded by the expansion force of the high pressure gas sealed in the cylinder 11a.
1b is elastically protruded from the cylinder 11a, and the tip of the piston rod 11b is pivotally connected to one end of a pivot pin 12 disposed at the bottom of the tip of the bracket 5. The rear end of the cylinder 11a is pivotally connected to a horizontal rod 7C extending horizontally between the intermediate portions of the side rods 7a, 7a of the drawing board support frame 7.

Then, the pivot point a of the gas spring 11 to the support stand 1 is adjusted by the balance adjustment mechanism 13 to the pivot point a of the drawing board support frame 7 to the support stand 1 and the pivot point a of the gas spring 11 to the drawing board support frame 7\. The movement can be adjusted with respect to the pivot point C.

The balance adjustment mechanism 13 has the gas spring 1 at one end.
The other end of the pivot pin 12 to which the pivot pin 12 of the bracket 5 is pivoted is fixed to the pivot end of the pivot arm 14 pivoted to the upper base end of the bracket 5, and the rotation of the pivot pin 12 of the bracket 5 is fixed. A long guide hole 15 having an arc shape in a portion corresponding to the flow path
A small diameter portion 12a at the other end of the pivot pin 12 is slidably inserted into the elongated hole 15 within a range substantially parallel to the gas spring 11.

Further, a cylindrical bush 16 is provided on the outer periphery of the pivot pin 12.
A nut member 17 is fixed to the outer periphery of this bush 16, and this nut member 17 is inserted into the elongated hole 15.
It is screwed into a threaded rod 18 disposed substantially parallel to.

One end of the threaded rod 18 is provided with a protrusion 1 protruding from the bracket 5.
It is rotatably and tiltably supported at the tip of 9.
Further, a knob 20 for rotational operation is fixed to the other end of the threaded rod 18.

The support structure for the threaded rod 18 is such that a spherical seat 21 is fixed to the lower surface of the tip of the projection 19, and a cap nut-shaped connector 22 fixed to the upper end of the threaded rod 18 is rotatably and tiltably attached to the spherical seat 21. It will fit together.

If it has such a configuration, the balance adjustment mechanism 13
By rotating the operating knob 20 to rotate the threaded rod 18, the nut member 17 screwed onto the threaded rod 18 is screwed forward and backward on the threaded rod 18.
The pivot pin 12 connected to the pivot pin 12 moves along the long hole 15, and the pivot point a of the gas spring 11 to the support base 1 can be moved and adjusted with respect to the other pivot points C. It is possible.

Moreover, when the pivot point a is moved relative to the other pivot points C, a change occurs in the direction in which the gas spring 11 presses against the drawing board support frame 7. This means that the biasing force relative to 7 can be changed.

Therefore, even if the size of the drawing board mounted on the drawing board support frame changes or the weight of the drawing machine etc. mounted on the drawing board changes, the drawing board support frame 7 generated by these weights will not be knocked down. This can be easily adjusted to offset the moment caused by the expansion force of the gas spring 11.

In other words, the balance force applied to the drawing board support frame 7 can always be adjusted to an optimal value, so that the drawing board support frame 7 can be tilted smoothly.

Moreover, the rotation arm 14 can be adjusted by using the gas spring 11.
Since most of the reaction force of the gas spring 11 in the direction of the threaded rod 18 is received by the arm 14, it is extremely difficult to adjust the forward and backward movement of the threaded rod 18. It will be done smoothly.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall side view;
Fig. 2 is a perspective view showing the main parts, Fig. 3 is a partially cutaway view taken along arrow III in Fig. 2, and Fig. 4 is an IV in Fig. 3.
-IV line sectional view. 1...Support stand, 7...Drawing board support frame,
11... Gas spring, 13... Balance adjustment mechanism, a, l), c... Pivot point.

Claims (1)

[Claims for Utility Model Registration] A support stand, a drawing board support frame pivotally mounted on the support stand, one end of which is pivoted to the drawing board support frame, and the other end of which is pivoted to the support stand. and a balance adjustment mechanism that moves and adjusts a pivot point between the gas spring and the support stand among the three pivot points. The adjustment mechanism includes a pivot pin 12 that pivotally supports one end of the spring, and a nut member 17 that is rotatably fitted onto the pivot pin 12.
The arm 14 has one end pivoted to the pivot pin 12 and the other end pivoted to the support base so as to be substantially parallel to the gas spring within the position adjustment range. A drafting table characterized in that it comprises an adjusting threaded rod 18 which is screwed into the nut member 17 and has one end fixed to the support base so as to be rotatable and tiltable, and has a knob 20 for rotational operation.