Torque Setting Device Radial Spring Configuration
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Solution Overview
Problem
Existing hand-held power tools with torque setting devices often have complex and bulky designs due to the serial arrangement of spring elements and threaded regions, which complicates the formation of a compact and robust torque setting mechanism.
Innovation Solution
A compact torque setting device is achieved by arranging the threaded region and compression spring in a parallel configuration, with a spring-loaded setting unit that includes a setting ring and spring retaining ring connected via an insert part, allowing for secure and adjustable torque settings while preventing undesired torque changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If spring elements and threaded region are arranged in series (axial direction), then the torque setting device can be structurally simple, but the overall length and compactness deteriorate
Solution Approach 1:
The patent transitions from a one-dimensional axial arrangement to a two-dimensional radial arrangement by placing the compression spring in a receptacle that extends radially from the threaded region. This dimensional change allows the spring elements and threaded region to occupy different spatial planes, reducing the overall axial length while maintaining structural simplicity.
Solution Approach 2:
The compression spring is nested within a receptacle that is integrated with the threaded region structure. The receptacle extends radially from the threaded region, allowing the spring to be housed within the existing structural envelope rather than requiring separate axial space, thus achieving compactness without compromising structural integrity.
2Volume of moving object
If threaded region is surrounded by compression spring in axial direction, then compactness is improved, but the arrangement complexity increases
Solution Approach 1:
The patent achieves compactness by arranging the compression spring radially around the threaded region rather than axially alongside it. This radial arrangement in a second dimension allows the components to share the same axial space while maintaining clear functional separation, reducing arrangement complexity despite the compact configuration.
Solution Approach 2:
The torque setting device is segmented into distinct functional components: the threaded region for torque adjustment and the compression spring in the receptacle for force application. This segmentation allows each component to be optimized independently and assembled in a compact radial arrangement without increasing overall complexity.
3Ease of manufacture
If setting unit is arranged on outer periphery of bars with external thread, then manufacturing simplicity is improved, but the setting precision may deteriorate
Solution Approach 1:
The patent replaces a complex internal threading system with a simpler external threading system on the bars. The setting unit engages with these external threads, providing sufficient torque setting precision while dramatically simplifying the manufacturing process, as external threads are easier to machine and assemble than internal threads.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables a simple, compact, and robust torque setting mechanism that securely sets predefined torque values, preventing damage from excessive torque and ensuring reliable operation.
Implementation Method 1
A compression spring which is arranged coaxially with the threaded region is assigned to the torque setting device
Implementation Method 2
the threaded region has at least two bars which are spaced apart from one another in the circumferential direction, wherein the setting unit is arranged on an outer periphery of the at least two bars
Data Source
AI summary
A hand-held power tool, in particular a screwdriver, includes a housing, in which at least one drive unit for driving a tool holder is arranged, the tool holder being designed to hold an insertion tool. The hand-held power tool further includes a torque setting device for setting a specified torque at least within specified limits. The torque setting device has a screw thread region and a spring-loaded setting unit for setting the specified torque. The setting unit is operatively connected to the screw thread region. The torque setting device is assigned a compression spring which is coaxial to the screw thread region. The compression spring is arranged such that the screw thread region surrounds the compression spring at least partly with respect to the axial direction of the drive unit.