Posture adjustment mechanism for a wheelchair seat

Abstract

The invention discloses a wheelchair seat position and posture adjusting mechanism. The wheelchair seat position and posture adjusting mechanism is characterized by mainly comprising a cross four-rod mechanism a seat lifting mechanism, a seat manually-leveling mechanism, a seat electrically-leveling mechanism, a seat locking mechanism and a control system. The cross four-rod mechanism mainly comprises a right cross rod, a left cross rod, a left sliding block, a right sliding block, a left screw shaft and a right screw shaft. The seat lifting mechanism mainly comprises a seat manually-adjusting lifting mechanism and an electrically-adjusting lifting mechanism. The seat manually-leveling mechanism mainly comprises a leveling handle, a left upper wheel gear, a right upper wheel gear, a left middle wheel gear, a middle shaft, an upper tie bar, a right middle wheel gear, an upper sector gear, a small shaft, a left lower wheel gear and a right lower wheel gear and a long shaft. The electrically-leveling mechanism mainly comprises a leveling motor, a left spur wheel gear, a right spur wheel gear, a short shaft, a lower sector gear, a lower tie bar, a left spur wheel gear, a lower shaft and a right lower spur wheel gear. The seat locking mechanism mainly comprises a cam, a spring ball, a lower sliding block, a left upper spur wheel gear and a right upper spur wheel gear.

Description

technical field [0001] The invention relates to wheelchair technology, in particular to a posture adjustment mechanism of a wheelchair seat. The adjustment mechanism is suitable for wheelchairs that can climb stairs. Background technique [0002] Wheelchairs are generally only suitable for walking on level ground. Stairs, obstacles and ravines limit the scope of use of electric wheelchairs, so people began to study electric wheelchairs that can climb stairs and cross obstacles. In the course of research on electric wheelchairs for climbing stairs, the safety of the user should be the most important. Therefore, the seat of the stair-climbing electric wheelchair should be adjustable. In "A Stair Climbing Wheelchair with Wheel Set Structure" designed by Li Chao et al. (see "Modern Machinery" 2010 No. 6 P233-P235), a wheelchair seat adjustment mechanism is disclosed, the main technical content of which is the design A raceway slide rail type seat adjustment mechanism is prop...

AI Technical Summary

Problems solved by technology

The disadvantage of this structure is that the braking of the roller needs to be limited by a special mechanism, which increases the complexity of the structure. This mechanism can only realize the horizontal adjustment of the seat when the wheelchair climbs stairs, but cannot realize the vertical adjustment of the seat when the wheelchair is on the ground. straight lift

The seat adjustment mechanism of this type of wheelchair uses a combination of hydraulic cylinder and mechanism movement, which brings certain difficulties to the manufacturing and assembly of the wheelchair, and the cost is very high

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