Torque Wrench Nested Beam Adjustment Mechanism
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Solution Overview
Problem
Existing torque wrenches lack an efficient mechanism for adjusting torque settings and indicating when the set torque is reached, leading to potential over-tightening or under-tightening of fasteners.
Innovation Solution
A torque wrench design featuring a primary beam and secondary beam with a torque adjustment mechanism, including a thumb adjustment wheel, that allows users to set and adjust torque settings precisely, with an audible indication when the set torque is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a torque adjustment mechanism is added to allow precise torque setting, then torque adjustment precision is improved, but device complexity increases
Solution Approach 1:
The torque adjustment mechanism employs nested components where the secondary beam is positioned within the primary beam, and the indicator assembly is nested within the handle structure. This nesting arrangement allows multiple functional elements to occupy overlapping spatial volumes, achieving precise torque adjustment capability without proportionally increasing the overall device complexity or size.
Solution Approach 2:
The primary beam serves multiple functions: it acts as a structural support element, a torque sensing element that deflects under load, and a mounting structure for the indicator mechanism. The secondary beam similarly functions as both a structural component and an indicator carrier. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity while achieving precise torque adjustment.
2Measurement precision
If an indicator mechanism is added to show when set torque is reached, then torque application accuracy is improved, but device complexity increases
Solution Approach 1:
The indicator mechanism is merged with the beam structure itself. The secondary beam is integrated into the primary beam assembly, and the indicator markings are directly associated with the beam's positional indicators. This merging eliminates the need for separate independent indicator systems, providing clear visual feedback on torque application accuracy while minimizing additional complexity.
Solution Approach 2:
The beam's own deflection under torque load serves as the indication mechanism. As the primary beam deflects due to applied torque, the position of the secondary beam relative to the primary beam automatically indicates the torque level through visible alignment or misalignment of marked positions. This self-service approach uses the mechanical deformation itself as the indication, avoiding complex external sensing or display systems.
3Ease of operation
If the thumb adjustment wheel is positioned offset from the rotational axis, then ease of operation is improved, but device complexity increases
Solution Approach 1:
A mechanical linkage acts as an intermediary between the offset thumb adjustment wheel and the primary beam. This linkage translates the rotational motion of the offset wheel into linear or rotational adjustment of the primary beam's torque setting. The intermediary mechanism allows the wheel to be positioned for ergonomic accessibility while still effectively controlling the torque adjustment, distributing the mechanical complexity across the linkage components rather than requiring direct axial alignment.
Data Source
AI summary
A torque wrench including a head, a handle, a primary beam, a secondary beam, and a torque adjustment mechanism. The primary beam couples the head and the handle for co-rotation about the rotational axis and the primary beam includes a first end adjacent the head and a second end adjacent the handle. The secondary beam is coupled to the head for rotation with the head about the rotational axis and the secondary beam is movable relative to the primary beam and the handle. The torque adjustment mechanism adjusts a torque setting of the primary beam relative to the secondary beam. The torque adjustment mechanism includes a thumb adjustment wheel that a user rotates about a first axis to adjust the torque setting by moving the second end of the primary beam relative to the handle along a second axis offset from the first axis.