Pneumatic Ratchet Wrench Knob Relocation
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Solution Overview
Problem
Conventional pneumatic driven ratchet wrenches have an operating knob that protrudes from the head section, making them unsuitable for use in narrow spaces and difficult to operate due to the knob's location being inaccessible from the handgrip section.
Innovation Solution
A pneumatic driven ratchet wrench design with a middle section between the head and handgrip sections, featuring a rotatable pneumatic motor, a ratchet wheel unit, gear members, and a gear-selecting unit with an operating knob positioned distal from the head section, allowing for directional switching without increasing the head section's profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the operating knob is disposed at the head section for directional switching, then the ratchet wheel can be set to selected rotational directions, but the overall profile of the head section is considerably increased and the operating knob becomes inaccessible from the handgrip section
Solution Approach 1:
The operating knob is relocated from the head section to the handgrip section, changing its spatial position along the longitudinal axis of the tool. This dimensional relocation allows the operator to access the knob naturally while maintaining a compact head section profile suitable for narrow spaces.
2Adaptability or versatility
If the operating knob protrudes outwardly from the head section, then the ratchet wheel can be engaged with gear members for directional control, but the ratchet wrench becomes unsuitable for use in narrow spaces
Solution Approach 1:
The operating knob and its associated directional switching mechanism are extracted from the head section and relocated to the handgrip section. This extraction eliminates the protruding structure from the head section, enabling the wrench to operate in narrow spaces while preserving the directional control functionality.
3Ease of operation
If the operating knob is disposed at the head section, then directional switching can be achieved, but operation of the operating knob cannot be reached by fingers of the hand that holds the handgrip section
Solution Approach 1:
The operating knob is repositioned from the head section to the handgrip section along the longitudinal axis, placing it within easy reach of the operator's fingers. This spatial reconfiguration eliminates the need to stretch or reposition the hand during operation.
Data Source
AI summary
A pneumatic driven ratchet wrench comprises: a wrench housing; a pneumatic motor; a ratchet wheel unit; two gear members; an urging member for biasing the gear members to engage the ratchet wheel; a transmission unit connected to the gear members and driven by the pneumatic motor; and a gear-selecting unit including an operating knob, a switching member and two pushing members. The operating knob is mounted on the wrench housing and is disposed distal from a head section of the wrench housing for driving movement of the pushing members. Each of the pushing members pushes a respective one of the gear members to move away from the ratchet wheel unit when moved from a releasing position to a pushing position.