JPS5913873Y2 - drafting desk - Google Patents

Description

[Detailed description of the invention] This application relates to a drafting desk configured so that the height and inclination of the drawing board can be arbitrarily changed. The main body is made up of a pair of left and right leg members 3 and 3', each having a support 2 erected on the leg 1, which are integrally connected by a connecting crosspiece 4.
One ends of two parallel arms 5, 6 made of, for example, square pipes are rotatably pivoted 5', 6' on the inner surface of the upper part, respectively.

Reference numeral 7 denotes a fixing crosspiece for fixing the tips of the upper parallel arm 5 to each other, for example, from a square pipe, into which a shaft rod 8 is inserted, and both ends pass through the tip of the upper parallel arm 5 to the outside. It extends in the direction.

Reference numeral 9 denotes a frame member to which the drawing board 10 is attached, and sleeve plates 11 are fixed to the left and right sides of the frame member, respectively. The lower end portions of the sleeve plates 11 are supported by extensions at both ends of the shaft rod 8, and the frame member is mounted at these support portions. 9 tilts freely with respect to the parallel arm 5.

Reference numerals 12, 13, and 14 are tongue-like pieces made by overlapping a plurality of thin elastic plates, one end of which is commonly supported on both end extensions of the shaft rod 8 at the left and right positions of the main body A, and the other end is are provided with shaft pieces 12', 13' on the side surface of the frame member 9, the middle part of the upper parallel arm 5, and the tip of the lower parallel arm 6, respectively.
14', and the four points of the pivot parts 5' and 6', the shaft rod 8, and the shaft piece 14' form four vertices of a parallelogram.

Reference numeral 15 designates a receiving piece that commonly receives one end of one of the tongue-like pieces 12, 13, and 14 attached to one extended end 8a of the shaft rod 8, and is preferably made of a nut as shown in FIG. ,
This is screwed onto the one extension end 8a.

B is attached to the other extended end 8b of the shaft rod 8, and
It is a locking member that fixes the tongue-like pieces 12, 13, and 14 attached to the left and right side surfaces of the main body A by forcefully pressing them simultaneously against the side surfaces of the left and right upper parallel arms 5 while movable in the axial direction. This is shown in FIGS. 5 to 8.

That is, there is a pressure contact member 17 having a U-shaped cross section and a pressure contact plate 16 provided at the inner end thereof, and a pressure contact member 17 that is housed within the pressure contact member 17 and extends vertically through the extended end portion 8b of the shaft rod 8. An operating member 1 having a U-shaped cross section and whose outer end is supported by a shaft pin 18
9, a rotating member housed in the pressure contact member 17 and having one end connected to the inner end of the operating member 19 via a shaft piece 20 and the other end connected to the pressure contact member 17 via a shaft pin 21; 22, and an operating handle 23 is attached to the operating member 19.

24 is the pressure contact member 1 that fits both ends of the shaft pin 18;
A long hole 25 formed in the upper and lower surfaces of 7 is a connecting pin that movably connects the upper end of the pressure contact plate 16 to the sleeve plate 11.

In the figure, reference numeral 26 denotes a balance spring installed obliquely between the support column 2 and the lower parallel arm 6.

Therefore, when the height of the drawing board 10 or its inclination angle is adjusted by moving the pair of parallel arms 5 and 6, the eighth
As shown in the figure, when the actuating member 19 is in a tilted state, the shaft piece 20 is located forward of the line n connecting the shaft pins 18 and 21, and the strong pressure of the tongues 12, 13, 14 is released and the respective is in a state of free rotation relative to the extended ends 8a, 8b of the shaft 8.

Therefore, in this state, the parallel arms 5 and 6 can be moved up and down against the balance spring 26, and the frame member 9 can be tilted to adjust the height of the drawing board 10 and its angle of inclination.

However, after setting the height of the drawing board 10 or its inclination angle to a desired state in this manner, when the operating handle 23 is moved in the direction of the arrow a in FIG. 8, the shaft pins 18 and 21 move in the relative direction. However, the shaft rod 8 receives a repulsive force in the direction of arrow C by the shaft pin 18, and the pressure contact member 17 receives a repulsive force in the direction of arrow C by the shaft pin 21, and as shown in FIG. Move slightly inward.

As a result, the tongue-shaped pieces 12, 13, and 14 are strongly pressed by the receiving piece 15 on the one extension end 8a side of the shaft rod 8 due to the movement of the shaft rod 8 in the direction indicated by the arrow. Tongue-shaped pieces 12, 13 on the extended end 8b side of
．． 14 is strongly pressed by the pressure contact plate 16, and -L on the left and right respectively.
It is tightened and fixed to the side surface of the parallel arm 5.

In the above description, the degree of tightening by the locking member B can be adjusted by adjusting the receiving piece 15 screwed onto one extended end 8a of the shaft rod 8.

Further, in FIG. 9, a knob 27 having a screw hole 24 is used as the locking member B, and this is attached to one extended end 8b of the shaft rod 8.
This figure shows the case where it is screwed into the threaded part formed in the hole.

As described above, according to the present application, not only can the inclination angle of the drawing board be changed arbitrarily, but also the drawing board can be moved in parallel in the vertical direction by a pair of parallel arms, and its height position can be freely set. Not only is it convenient to use, but it is also possible to attach one end to the frame member, the upper parallel arm, and the lower parallel arm at both end extensions of the shaft that connects the ends of the left and right upper parallel arms. the other end of the tongue-shaped piece being pivotally connected to be commonly supported;
By tightening a single locking member provided with this support part at one extended end of the shaft rod, the shaft rod is moved in the axial direction and tightened and fixed, so that the height and inclination angle of the drawing board can be adjusted. It has advantages such as easy fixing operation after setting.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and FIG. 1 is an overall front view, FIG. 2 is a side view of the same, FIG. 3 is a side view in use, and FIG. 4 is a partial plan view of one end. FIG. 5 is a partial plan view of the locking member in a tightened state, FIG. 6 is a right side view of the same, FIG. 7 is a front view of the same, FIG. 8 is a plan view of the same with the locking member released, and FIG. The figure is a partial sectional view showing another embodiment of the locking member. In the figure, A is the main body, 3 and 3' are leg members, 5 and 6 are parallel arms, 7 is a fixed crosspiece, 8 is a shaft rod, 8 a and 8 b are extension ends, 9 is a frame member, and 10 is a drawing board , 11 is the sleeve plate, 12, 13
．． 14 is a tongue piece, 12', 13', 14' are shaft pieces, 15
is a receiving piece, and B is a locking member.

Claims (1)

[Scope of utility model registration request] One end of each of the two parallel arms is pivotally attached to the upper part of the support of the left and right leg members, and the tips of the left and right upper arms are fixed to each other by a fixing bar, and both ends of the left and right upper arms are fixed within the fixing bar. A shaft rod is inserted through the tip of the shaft so as to extend in the left and right direction, and the lower ends of the sleeve plates provided on the left and right sides of the frame member provided with the drawing board are pivotally connected to the extensions at both ends of the shaft rod. , one end commonly supports the other end of a tongue-shaped piece, for example, a bullet plate, which is pivotally connected to the frame member, the upper arm, and the lower arm, respectively, and a stopper is attached to the extension end of one of the shaft rods, and a stop piece is attached to the extension end of the other shaft. The drafting desk is equipped with a locking member at the extension end for moving the shaft in the axial direction and fixing the sleeve plate and each tongue-like piece to the upper arm by force.