| 摘要 |
A pneumatic wrench with a butterfly steering switching mechanism includes a casing, a striking module, a motor module, a back cover, a butterfly operating lever, a speed control knob, a flow control valve, a forward/reverse rotary valve, a trigger module, and an air seal module. The novel design of the butterfly operating lever, the alternate installation of each mechanism of the wrench, and the optimal configuration of the air passage provide a wrench that can be operated by one hand for left and right handed operator and achieve the effects of lowering the production cost of a casing blank, improving the transmission loss compressed air in the wrench, and saving energy. |
| 主权项 |
1. A pneumatic wrench with a butterfly steering switching mechanism, comprising a casing, a striking module, a motor module, a back cover, a back cover paper pad, an air seal module, an air seal washer, a forward/reverse speed control assembly, a trigger module, a hollow pin C, a screw, and a spring washer, characterized in that the casing includes a handle disposed at the bottom of the casing, an air intake hole formed on the handle, and an air seal washer pressed into the air intake hole, and the air seal module is locked securely into the air intake hole by a pipe joint and naturally situated in an always closed status; and the casing has a large inner hole therein and provided for serially and sequentially installing the striking module and the motor module, and the back cover is provided for sealing the motor module and the striking module in the casing by using a plurality of screws and a plurality of spring washers, and a back cover paper pad is sealed between the casing and the back cover, and an exhaust slot A, a forward air tank A and a reverse air tank A are disposed on the rear surface of the casing, and a forward air tank B and a reverse air tank B are disposed on an end surface of the back cover, and the forward air tank A and the reverse air tank A of the casing are corresponsive to the forward air tank B and reverse air tank B of the back cover, and the motor module includes a forward air tank C and a reverse air tank C corresponsive to the forward air tank B and the reverse air tank B disposed on an end surface of the back cover, and the casing has a trigger module mounting hole formed at the front of the casing and provided for installing the trigger module therein, and an air intake ejector installed at the rear of the casing, and the air seal module includes an air intake valve, a return spring and a pipe joint, such that when the trigger module is pressed, the air intake ejector pushes and opens the air intake valve in the air seal module to drive the pneumatic wrench to input air and operate, and when the trigger module is released, the air intake valve and the trigger module resume their natural status to achieve the effect of stopping the operation of the pneumatic wrench under the effect of the return spring in the air seal module, and a forward/reverse speed control assembly mounting hole is formed above the trigger module mounting hole of the casing and has a forward/reverse speed control assembly formed therein, and the forward/reverse speed control assembly includes a hollow pin A, a speed control knob, a butterfly operating lever, a forward/reverse rotary valve, a gasket A and a flow control valve, and the speed control knob and the butterfly operating lever are disposed outside the forward/reverse speed control assembly mounting hole, and the forward/reverse rotary valve and the flow control valve are installed in the forward/reverse speed control assembly mounting hole, and the speed control knob includes an inner hole C, and a latch groove is formed at the middle of the butterfly operating lever, and a small end of the forward/reverse rotary valve is substantially a square head, and the latch groove of the butterfly operating lever is operated closely with the square head of the forward/reverse rotary valve, and the butterfly operating lever may be turned to drive the forward/reverse rotary valve to be rotated axially, so as to achieve the effect of switching to a forward or reverse rotation of the wrench; and a radial hole A is formed at the external periphery of the forward/reverse rotary valve, and an inner hole A is formed in the forward/reverse rotary valve, and three different sized radial holes are formed at the external periphery of the flow control valve, and a small end of the flow control valve is passed through the gasket B and sheathed by the inner hole A of the forward/reverse rotary valve, and a passing-out end of the flow control valve is sheathed by the inner hole C of the speed control knob And fixed by the hollow pin A, and the speed control knob may be turned to produce a misalignment of the valve radial hole B of the flow control with the radial hole A of the forward/reverse rotary valve to control the airflow to achieve the speed control of the wrench. |
