JP2789515B2 - Drawing board angle changing device for drafting table - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawing board angle changing device for a drafting table.

[0002]

2. Description of the Related Art Japanese Patent Laying-Open No. 54-68357 discloses that when the drawing plate angle is changed by changing the engaging position of an engaging recess and an engaging rod to bring the drawing plate to its maximum upright state, , The first
There is disclosed a drafting table in which the second engagement recesses are staggered from each other so that the drawing board can be returned to a horizontal state.
Japanese Patent Application Laid-Open No. 62-82907 discloses an engagement in which the angle of the drawing plate is changed by changing the engagement position between the engagement recess and the engagement rod, and the engagement lever is locked in the engagement recess by the operation lever. A drafting table provided with a guide member is disclosed.

[0003]

SUMMARY OF THE INVENTION Problems to be Solved by the Invention
The gist of the invention is that the drawing table of No. 57 can perform the operation of returning the drawing plate from the upright state to the flat state only by the tilting operation of the drawing plate. However, in the device according to the present invention, the drawing plate cannot be locked at a desired angle,
Therefore, the engagement between the engagement recess and the engagement rod may be disengaged, and the angle of the drawing plate may be unexpectedly changed. To solve this problem is the invention of JP-A-62-82907. However, in this apparatus, the following operation is required to change the angle of the drawing board. That is, (1) the drawing board is supported so as not to drop suddenly. (2) Release the lock lever. (3) Changing the drawing board angle. (4) Fix the angle with the lock lever. Therefore, there is a problem that the angle of the drawing board cannot be easily changed. An object of the present invention is to solve such a problem.

[0004]

In order to achieve the above object, the present invention provides a drawing support frame which is supported on a leg so as to be tiltable, and a plurality of engaging recesses fixed to the drawing support frame. An engagement plate arranged in the front-rear direction of the plate support frame, and a support rod having one pivotally supported by the leg and a shaft connected to the other at right angles, and the shaft is provided with one of the engagement recesses. By fitting the drawing board support frame into the engagement recess with the leg as a fulcrum,
In the drawing board angle changing device for a drafting table, the apparatus is supported at an inclination angle corresponding to the one engagement recess, and the inclination angle is changed by changing a fitting position of the shaft to the engagement recess. A lock plate having a lock surface extending in a linear direction is slidably attached to the plywood so that the lock surface can move parallel to and away from the engagement recess, and the lock plate is attached to the lock surface. Are biased by a spring in a direction approaching the engagement recess, and the shaft fitted into the engagement recess is elastically contacted by the lock surface.

[0005]

In the state where the shaft is fitted in the engagement recess,
The lock surface of the lock plate resiliently contacts the lower surface of the shaft and locks the shaft to the engagement recess by a spring force. When the drawing plate supporting frame is manually lifted, the shaft pushes down the lock plate against the engagement plate against the spring force, whereby the locked state in the engagement recess of the shaft is released, and the shaft is freely engaged. It becomes possible to fit into the recess.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be described below in detail with reference to embodiments shown in the accompanying drawings. Reference numerals 2 and 4 denote legs of the drafting table, and approximately in the middle thereof, legs 6 and 8 are inclined forward.
And a reinforcing rod 10 is provided between the lower portions of the legs 6 and 8. Reference numeral 12 denotes a drawing board supporting frame,
6, a front horizontal rod 18, and a rear horizontal rod 20. The side rods 14 and 16 of the support frame are formed of square pipes having a square cross section, and their front portions are brackets 22 and 24.
The shaft 26 is rotatably supported on the upper side surfaces of the legs 6 and 8 via an axis so as to be rotatable about an axis horizontal to the floor surface.

An L-shaped front horizontal rod portion 18 is provided between the upper surfaces of the front end portions of the side rod portions 14 and 16 of the support frame, and a rectangular cross section is provided between the rear lower surfaces of the side rod portions 14 and 16. A rear horizontal rod portion 20 composed of a square pipe is provided. A drawing board 28 is placed on the drawing board support frame 12, a front end face of the drawing board 28 is screwed to a rising portion of the support frame horizontal rod portion 18 with a wood screw, and a rear end face of the drawing board 28 is connected to the support frame side. Rod 1
Stop fitting 30 slidably fitted to the rear part of 4, 16
Is fixed to the rising portion 30a by a wood screw.

Note that, depending on the model of the drafting table, the drawing plate 28 can be fixed to the drawing plate support frame 2 only from the lateral direction. In that case, as shown in FIG.
This stopper 30 is slidably inserted into both ends of the horizontal rod 20 without being inserted into the rear portions of the side rods 14 and 16. Then, the cap 32 is fitted into the rear end openings of the side rods 14 and 16. Next, a height adjusting bracket 34 is fixed to the back surface near the side surface of the drawing plate 28 with a wood screw 36. Next, a donut-shaped cushion rubber 40 is adhered to the hole 38 formed in the stopper 30 so as to match the hole 38, and the cushion rubber 40 is arranged on the lower end surface of the height adjusting bracket 34. The screw 42 is screwed into the screw hole at the bottom of the height adjustment fitting 34 from the hole below the fitting 30 through the hole 38, and the drawing board 28 is fixed to the fitting 30 via the height adjustment fitting 34.

In FIG. 2, reference numeral 44 denotes an engagement plate comprising an upper horizontal portion 44a and a vertical side portion 44b. The upper horizontal portion 44a is fixed to the lower surface of the front portion of the support frame side rod portion 14. Engaging concave portions 46, 48, 50, 52 project downward from the vertical side portion 44 b of the engaging plate 44. Reference numeral 54 denotes a lock plate which is disposed in parallel contact with the outer side surface of the engagement plate 44, and is provided with the engagement recesses 46, 48, 50,
An elongated hole 56 extending in a direction parallel to the arrangement direction of the 52 is formed along the longitudinal direction. The lower wall surface of the front slot 56 forms a lock surface 56a. Guide holes 58, 60 formed by inclined guide portions 58 a, 60 a and upper horizontal portions 58 b, 60 b are provided at positions near both ends of the lock plate 54.
The guide pins 62 and 64 fixedly mounted on the base are inserted and arranged.

The guide pins 62, 64 are integrally formed with disc-shaped heads 62a, 64a for retaining. A shaft portion of a cap screw 66 is screwed into a screw hole of the engagement plate 44, and a coil portion of a spring 68 is fitted into the shaft portion. The spring 68 is disposed on the outer surface of the lock plate 54 through an escape hole 70 penetrated through the lock plate 54, one end of which is locked by the hole of the engagement plate 44, and the bending portion 68a at the other end.
Are engaged with the lower surface of the lock plate 54. The spring 68
Are urged in the direction of pushing up the lock plate 54 with the engagement plate 44 as a fulcrum. The engagement plate 44 and the lock plate 54 constitute an angle adjustment unit 72.

An engaging plate 44 is also provided on the other support frame side rod portion 16.
An angle adjusting unit 72 is attached, which includes an engagement plate having the same structure as the above and a lock plate having the same structure as the lock plate 54. Numerals 74 and 76 denote support frames pivotally supported on the inner surfaces of the upper portions of the legs 6 and 8, respectively. The shaft 8
The reference numeral 2 is disposed through the long hole 56 of the lock plate 54. The right and left structures of the drafting table viewed from the front in FIG. 3 are targeted.

Next, the operation of this embodiment will be described. FIG. 1A shows the angle adjustment unit 72 on the left side of the drafting table when the drawing board 28 is in a horizontal state, and the shaft 82 is fitted and locked in the engagement recess 52 at the innermost part of the engagement plate 44. In this state, the lock plate 54 is guided by the inclined guide portions 58a, 60a of the guide holes 58, 60, which are parallel to each other, by the force of the spring 68, and is pushed upward obliquely to the lock surface 56a.
Resiliently contacts the lower surface of the shaft 82 and locks the shaft 82 in the engagement recess 52 so that the shaft 82 does not easily come off the engagement recess 52. When changing the angle of the drawing board 28, the drawing board 28 is manually pulled up in the direction of the arrow in FIG. Thereby, as shown in FIGS.
2 moves out from the locked position of the engagement plate 44, that is, from the engagement concave portion 52, and starts moving leftward.

When the shaft 82 reaches the next lock position, the lock plate 54 is urged in the ascending direction by the spring 68. Locked. FIG. 1C shows the angle adjustment unit 72 in a state where the shaft 82 reaches the next lock position and the angle of the drawing plate 28 is inclined by one step. In FIG. 1, there are four lock positions. By changing the number and positions of the lock positions, the inclination angle of each stage can be adjusted.

When returning the inclination of the plate 28 to the horizontal direction, the shaft 82 is moved to the left end of the elongated hole 56 of the lock plate 54 as shown in FIGS. Thereafter, when the elongated hole 56 is further pushed leftward by the shaft 82, the guide pins 62 and 64 are pushed.
Move to the upper horizontal portions 58b, 60b of the guide holes 58, 60 as shown in FIG. 1E, the lock plate 54 is held at the raised position with respect to the engagement plate 44, and the engagement recess 4 of the engagement plate 44
The shaft 82 does not enter the 6, 48, 50, 52.

If the drawing plate 28 is returned in the horizontal direction in the state of FIG. 1E, the shaft 82 returns to the right direction, and the state of FIG. 1A is obtained. That is, the shaft 82 is connected to the elongated hole 56 of the lock plate 54.
After reaching the right end of
The shaft 82 presses the right end of the elongated hole 56 in the right direction, and the guide pins 62 and 64 that have entered the upper horizontal portions 58b and 60b of the guide holes 58 and 60 are moved to the upper horizontal portions 58b and 60b.
Deviates from 60b. When the guide pins 62 and 64 are disengaged from the upper horizontal portions 58b and 60b of the guide holes 58 and 60, the locking plate 54 is urged in the ascending direction by the force of the spring 68, and the shaft 82 is engaged with the engaging recess 52 of the engaging plate 44. And returns to the state of FIG. The operation of the right angle adjustment unit 72 of the drafting table is exactly the same as the operation of the right angle adjustment unit 72.

[0016]

Since the present invention is constructed as described above, the angle of the drawing board supporting frame can be easily changed only by the tilting operation of the drawing board, and the drawing board supporting frame can be locked at a desired angle. There is an effect.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the operation of the present invention.

FIG. 2 is an exploded perspective view of a main part of the present invention.

FIG. 3 is a front view of a drafting table.

FIG. 4 is a sectional view taken along line AA.

FIG. 5 is a side view showing a state where the drawing plate is inclined in a standing direction.

FIG. 6 is an external view of a drawing support frame.

[Explanation of symbols]

 2 foot rod 4 foot rod 6 leg 8 leg 10 reinforcing rod 12 drawing board support frame 14 side rod section 16 side rod section 18 horizontal rod section 20 horizontal rod section 22 bracket 24 bracket 26 axis 28 drawing plate 30 stopper 32 cap 34 Height Adjustment Bracket 36 Wood Screw 38 Hole 40 Cushion Rubber 42 Adjuster Bolt 44 Engagement Plate 46 Engagement Recess 48 Engagement Recess 50 Engagement Recess 52 Engagement Recess 54 Lock Plate 56 Long Hole 56 a Lock Surface 58 Guide Hole 60 Guide Hole 62 Guide pin 64 Guide pin 66 Cap screw 68 Spring 72 Angle adjuster 74 Support rod 76 Support rod 78 Pivot 80 Pivot 82 Shaft

Continuation of the front page (72) Inventor Junji Mukai 3-9 Nishiyuge, Yao-shi, Osaka Co., Ltd. Komura Seisakusho Co., Ltd. (56) References JP-A-62-82907 (JP, A) JP-A-54-68357 (JP) , A) Japanese Utility Model Showa 53-135101 (JP, U) Japanese Utility Model Showa 58-1000065 (JP, U) Japanese Utility Model Showa 56-45336 (JP, U) Japanese Utility Model Showa 38-21539 (JP, Y1) (58) Surveyed field (Int.Cl. ⁶ , DB name) A47B 27/18 A47B 27/02

Claims (1)

(57) [Claims] 1. A drawing board support frame which is supported on a leg so as to be tiltable, an engagement plate fixed to the drawing board support frame and having a plurality of engagement recesses arranged in the front-rear direction of the drawing board support frame. A support rod, one of which is pivotally supported by the leg and the other of which is connected to a shaft in a direction perpendicular to the other, the shaft being fitted into one of the engagement recesses and the drawing board supporting frame being With the leg as a fulcrum, supported at an inclination angle corresponding to the one engagement recess,
In the drawing plate angle changing device of the drafting table which is configured to change the inclination angle by changing a fitting position of the shaft with respect to the engaging concave portion, the engaging plate has a lock plate having a lock surface extending in a linear direction, The lock surface is slidably mounted so that the lock surface can move parallel to and away from the engagement recess, and the lock plate is urged by a spring in a direction in which the lock surface approaches the engagement recess. A drawing board angle changing device for a drafting table, wherein the shaft fitted into the engagement recess is elastically contacted by the lock surface.