SU328630A1 - Drawing table - Google Patents

Description

A drawing table is known comprising a frame, a movable column with a rotatable drawing board, a balancing mechanism and a mechanism for fixing the drawing board. The table can be used only for standard sizes of drawing boards and drawing instruments.

The purpose of the invention is to increase the table load capacity and increase the reliability of its work.

This is achieved by the fact that the table has several movable columns, the upper parts of which are connected by a common elastic tension and are centered one relative to the other by floating sleeves. The balancing mechanism has several drums installed one under each column, while the extreme drums are interlocked with each other using a rod.

FIG. 1 shows a drawing table, side view; in fig. 2 - the same, bottom view; la fig. 3 - the mechanism for fixing the tilt of the drawing board; Fig, 4 - part of the movable column, in section; in fig. 5 - cross section of columns; Fig. 6 shows a drum mechanism of equilibration with a partial section.

The drawing table contains frame 1, movable columns 2 with brackets 3 carrying the turntable 4.

The table is equipped with mechanisms for balancing and fixing the board at a given height and a given angle of inclination of the drawing board.

The mechanism for fixing and tilting the drawing board is made in the form of two conical sleeves 5 mounted on brackets 3 and connected by a tie 6 made of spring wire. In the center of the movable speakers 2, tension springs 7 with adjusting screws 8 are attached to the stitch 6. In the lower part of the frame 1, balancing drums 9 are installed below each movable speaker 2 9. In the drums there are stationary cassettes 1O with torsion springs 11. The outer ends of the springs 11 are attached to the casings of the cassettes 1O, and the inner ones are hooked to the axis 12. The ends of the axis are enclosed in the trunnions 13 and mate with the bearings 14. One end of the drums

9 is mounted stationary relative to frame 1, and the other is positioned on a double-arm lever 16, which is rotated from the foot pedal 15.

The number of movable columns and balancing drums is determined based on the total weight of the movable part of the table with two movable columns and two balancing drums.

The drums 9 are wrapped around with steel ribbons 17, the ends of which are rigidly attached to the stanchion 1. Reels 18 are wound on the drums, the free ends of which pass through the rollers 19, 20 and are connected to straighten 6 at the points of attachment of springs 7 to it

In versions of the drawing table with three or more columns and drums, the last megewoods with two extreme drums are set at both ends stationary relative to the bed and are not equipped with steel tapes.

Under the action of the weight of the movable part of the table, the drums 9 tend to rise, while the belts 17 forming a loop around the drums tighten and prevent their rotation.

The swivel arms of the 16 extreme drums are interlocked with each other by a bar 21 with pedals 15.

The movable columns 2 are equipped with supporting 22 and gland 23 rollers mounted on the swivel arms 24. The proximal ends of the levers are interconnected by an extension spring 25. At the top of the column 2 are interconnected between themselves with a floating sleeve 26 and tightened with a common tie 6, which allows the columns to move one relative to the other when moving in the guide frame 1, at least in two planes. The oscillation of the columns during the movement eliminates their jamming in the bed guides. A force is applied to the tie-rod 6, equal to the weight of the movable part of the table, which pulls the tie-rod and wedges the tapered couplings 5. However, this force is opposed by the force of the springs 7, which are adjusted so that

was sufficient to securely fix the inclination of the turntable 4.

When you press one of the pedals 15, the levers 16 rotate and move the drums 9 down, the steel belts 17 release the drums, which, depending on the direction of movement of the drawing board, can rotate in one direction or another. When the drawing board is lowered, the cables 18 are removed from the drums 9 and, rotating them, the springs 11 are twisted.

The movable part of the table is balanced by changing the torque of the balancing mechanism.

The drawing board is rotated by applying a hand to the lower edge of the board. In this case, the tension force of the cables 18 is leveled by the springs 7, the stud 6 is loosened and the conical sleeves 5 are released. After setting the required angle of inclination of the board 4, the latter is released and the couplings are wedged.

The jamming force of the clutches 5 is controlled by changing the tension force of the springs 7 with the help of screws 8.

Claims (1)

Invention Formula A drafting table containing a frame, a movable column with a rotary drawing board, a trimming mechanism made in the form of a drum mounted in the lower part of the frame with stationary cassettes with torsion springs placed in it and a tilt-fixing board that, in order to increase its carrying capacity and increase reliability of operation, it has several movable columns, the upper parts of which are connected by a common elastic tension and are centered one with respect to Other floating sleeves, and the balancing mechanism has several drums installed one under each column, while the extreme drums are interlocked with each other by means of a rod. 476 25 23 2 20 5 ue.6