Angle regulating device for blood-drawing chair back plate

Abstract

The invention discloses a device for adjusting the angle of the back plate of a blood collection chair, which comprises a seat plate frame, a back plate frame, and an electric push rod with an output shaft arranged at the bottom of the back plate frame. The bottom of the plate frame is rotatably connected with a push rod piece, and one end of the push rod piece is rotatably connected with the seat plate frame; the bottom of the back plate frame is provided with a guide column, and the guide column A shaft sleeve is slidably sleeved on the outer peripheral wall of the column; the other end of the push rod piece is rotatably connected with the shaft sleeve, and the output shaft is connected with the shaft sleeve. The present invention has the advantages of: (1) the direction of motion of the output shaft is the same as that of the shaft sleeve, the utilization rate of the force of the output shaft is high, theoretically 100% of the force does work, and the motion is more stable; (2) the angle of the structure The adjustment range is large, theoretically it can reach ±90°, and the requirements for the expansion and contraction range of the output shaft are low.

Description

technical field [0001] The invention relates to a device capable of adjusting the angle of the back board of the blood collection chair relative to the seat board. Background technique [0002] The angle adjustment device of the backboard of the existing blood collection chair usually includes a seat frame (1) and a back frame (2) which are rotatably connected, wherein the seat frame (1) is connected with the seat, and the back frame (2) Connected with the backrest, the bottom of the seat frame (1) is connected with a support (11), one end of the support (11) is fixedly connected with the seat frame (1), and the other end Located below the backboard frame (2), the bottom of the backboard frame (2) is rotatably connected with an electric push rod (4), and the electric push rod (4) has an output shaft (41 ), the output shaft (41) is rotationally connected with the other end of the support (11). When the output shaft (41) is extended, the back frame (2) is folded relative to ...

AI Technical Summary

Problems solved by technology

The angle adjustment device of the backboard of the blood collection chair with this structure, because the electric push rod (4) and the backboard frame (2) are connected in rotation, the connection is not stable, so the force of the whole device is not stable; see Figure (2) ), the schematic diagram of the angle adjustment device of the blood collection chair backboard of this structure, the meaning of the slider in the figure is that the output shaft (41) can be stretched, so the rod length of the electric push rod (4) is change, and the rod length corresponding to the backboard frame (2) is constant, because the length variation range of the electric push rod (4) will not exceed half of its own length, so the adjustment of the whole device Angle α range is limited

Images