JPS6119693Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a torsion bar assembly device for a drafting table.

A conventional tilt-balanced drafting table, in which a drawing board frame is tiltably supported on the underframe by a pair of bearing members each securing both ends of a linear torsion bar, is used to support a drawing board frame and a drafting machine attached to the drawing board frame. One bearing member is fixed to the drawing board frame side, and the other bearing member is attached to the underframe so that the torsion bar becomes neutral when the drawing board frame is tilted to a balanced state so that the center of gravity of the board is in the vertical plane. Since it is fixed to the side, when a user attaches a drawing board, a drawing machine, a light, etc. to the drawing board frame, the drawing board frame suddenly moves via the torsion bar, which is dangerous.

The object of the present invention is to provide a torsion bar assembly device that can prevent the above-mentioned dangers.

In order to achieve the above object, the present invention provides a drafting table in which a drawing board frame is tiltably supported on an underframe by a pair of bearing members each securing both ends of a linear torsion bar. fixed to one angle adjustment plate of the drawing board frame, and the other bearing member is slidably attached to the other angle adjustment plate of the drawing board frame,
An engaging portion consisting of a protrusion and a recess that engage with each other when the drawing board frame is tilted in a substantially balanced state is provided between the other bearing member and the side member of the underframe, and the other bearing member is It is provided with a biasing spring that constantly presses the engaging portion in a direction in which it can be engaged.

Since the present invention is constructed as described above, when the drawing machine is attached to the drawing board frame and the drawing board frame is tilted in a balanced state, the torsion bar is automatically assembled by the engagement of the engaging parts. It can be attached.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

In the figure, 1 is a drafting table, and the drawing board frame 2
and an underframe 3. 4 and 5 are a pair of angle adjustment plates attached to the drawing board frame 2, and 6 and 7 are the underframe 3.
This is a side plate as a side member. 8,9
are a pair of flanged bearing members, and the angle adjusting plate 4,
5 and the side plates 6, 7 are pivotally connected, and the rectangular portions at both ends of the linear torsion bar 10 are slidably fitted to ensure that they cannot rotate.

One flange bearing member 8 is fixed to one angle adjustment plate 4, and the other flange bearing member 9 is slidably attached to the other angle adjustment plate 5. Numeral 11 is a biasing spring that biases the flanged bearing member 9 in the direction of drawing it into the inside of the drawing board frame 2. A pin 12 is provided as a protrusion of an engaging part on the outer surface of the side plate 7, and a locking hole 13 is formed in the collar of the flanged bearing member 9 as a recess of the engaging part with which the pin 12 engages. It has been done. The pin 12 and the locking hole 13 are arranged so as to face each other when the drawing board frame 2 is in a substantially balanced state, that is, when it is tilted at about 60 degrees. Furthermore, in order to ensure safety during use, holes are formed in the side plate 7 so as to face the remaining holes in which the pin 12 does not engage, and after the pin 12 and the locking hole 13 engage, these holes are formed. The hole is fixed with a fixing bolt. Instead of the illustrated structure, the pin 12 may be provided protruding from the flange of the flanged bearing member 9, the locking hole 13 may be formed in the side plate 7, or other engagement and locking means may be used. Of course. Reference numeral 14 denotes a slide column, and the underframe 3 is attached to the upper end thereof. 15 is a support that supports the slide support 14 so as to be movable up and down, and 16 is a brake pipe.

It goes without saying that the torsion bar assembly device of the present invention can also be applied to drafting tables of types other than those shown.

Since the present invention is constructed as described above, before a drawing board, a drawing machine, a light, etc. are attached to the drawing board frame 2, one end of the torsion bar 10 is fixed to the flange fixed to the angle adjustment plate 4. A flanged bearing member 9 secures the other end of the torsion bar 10, although it is secured by the flanged bearing member 8.
is not fixed, so there is no spring action on the torsion bar 10. At this time, since the pin 12 and the locking hole 13 do not face each other, the flanged bearing member 9 is pushed out toward the outside of the side plate 7 against the biasing spring 11, as shown in FIG. Therefore, after attaching a drawing board, a drawing machine, etc. to the drawing board frame 2 while the torsion bar 10 has no spring action, the drawing board frame 2 is tilted, and the drawing board, drawing machine, etc. are connected to the drawing board frame. As soon as the center of gravity enters the vertical plane, the pin 12 and the locking hole 13 face each other, and the flanged bearing member 9 is biased by the biasing spring 11.
is pulled inward of the drawing board frame 2, and the pin 12
and the locking hole 13 engage with each other, and the bearing member 9 is fixed to the side plate 7 of the underframe 3. When the bearing member 9 is fixed, the torsion bar 1
0 is the neutral point, and when the drawing board frame 2 is tilted horizontally or vertically around this neutral point, a spring action is generated on the torsion bar 10, and it can be used as a tilt balance device for a drafting table.

As can be easily understood from the above explanation,
According to the present invention, it is possible to easily assemble the torsion bar and attach the drawing board, drawing machine, etc. without any danger.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the drafting table, FIG. 2 is a side view of the main parts, and FIGS. 3 and 4 are sectional views taken along line A-B in FIG. 2 for explaining the operation. 1: Drafting table, 2: Drawing board frame, 3: Underframe, 4, 5:
Angle adjustment plate, 6, 7: Side plate, 8, 9:
Bearing member, 10: torsion bar, 11: urging spring, 12: pin, 13: locking hole.

Claims (1)

[Scope of utility model registration request] In a drafting table in which a drawing board frame is tiltably supported on the underframe by a pair of bearing members each securing both ends of a linear torsion bar, one of the bearing members is fixed to one angle adjustment plate of the drawing board frame. , the other bearing member is slidably attached to the other angle adjustment plate of the drawing board frame, and when the drawing board frame is tilted in a substantially balanced state between the other bearing member and the side member of the underframe. A drawing characterized in that an engaging part consisting of a protrusion and a recess that engage with each other is provided, and a biasing spring is provided that constantly presses the other bearing member in a direction in which the engaging part can engage. Torsion bar assembly device on the stand.