Patent ID: 11883340
Assignee: nan
Field: Medical technology (Instruments)
Classification: CPC A  F | IPC A  F

Claim 1:
2. The mechanical type lifting shifter of claim 1; wherein the pedal transmission assembly comprises:
a worm-and-gear assembly, comprising a worm and a worm wheel; an end portion of the worm is in transmission connection with the worm wheel, and the worm wheel is in transmission connection with the rotating shaft;
a bevel gear assembly, comprising a pair of large bevel gears facing towards each other and a small bevel gear in a size smaller than the large bevel gears arranged between the pair of large bevel gears and meshed with the large bevel gears; the small bevel gear is arranged on another end portion of the worm of the worm-and-gear assembly via a first limit key;
a pedal ratchet assembly, comprising a first pedal, a ratchet pin, a pedal ratchet and a linkage shaft; the linkage shaft penetrates a central axis of the pair of large bevel gears, and rotations of the linkage shaft and the large bevel gears are independent from each other; the pedal ratchet is fixed on the linkage shaft between the pair of large bevel gears by the ratchet pin; the first pedal is in transmission connection with the pedal ratchet to transmit motion to the pedal ratchet to drive the linkage shaft to rotate;
the pedal clutch assembly comprises a second pedal and a pair of connecting mechanisms; each of the pair of connecting mechanisms is arranged on a side of a corresponding large bevel gear, the pair of connecting mechanisms is fixed on the linkage shaft via a second limit key; the second pedal is in transmission connection with the pair of connecting mechanisms; when stepping on or resetting the second pedal, one of the connecting mechanisms on one side is driven to be fixed to the corresponding large bevel gear on the same side, while another one of the connecting mechanisms on another side is disconnected from the corresponding large bevel gear on said another side.