Combination Square Head With Eccentric Pin Angle Adjustment
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Solution Overview
Problem
Conventional combination squares require labor-intensive and time-consuming manual adjustments to achieve accurate relative angles between the planar surfaces of the head and blade, increasing production costs.
Innovation Solution
A combination square design incorporating spiral roll pins and magnets to adjust the relative angle between the head and blade surfaces, allowing for quick and precise squaring through rotational adjustment of the pins, optionally with a wear shield to prevent wear and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual filing adjustment of lands is used to achieve accurate relative angle, then manufacturing precision is improved, but productivity deteriorates due to labor-intensive and time-consuming adjustments
Solution Approach 1:
The patent replaces the manual mechanical filing system with a magnetic field-based positioning system. Magnets are embedded in the head to hold the blade at precise angles without requiring manual filing adjustments, thereby maintaining manufacturing precision while dramatically improving productivity.
Solution Approach 2:
The magnetic positioning system enables the combination square to self-adjust and self-hold the blade at the correct angle automatically. The magnets provide continuous holding force that maintains precision without requiring ongoing manual intervention or adjustment operations.
2Manufacturing precision
If manual filing adjustment of lands is used to achieve accurate relative angle, then manufacturing precision is improved, but loss of time increases due to repeated adjustments and checks
Solution Approach 1:
The magnets are pre-positioned during manufacturing to provide immediate angular accuracy upon blade insertion. This preliminary positioning action eliminates the need for time-consuming repeated adjustments and checks that were required with the manual filing method.
Solution Approach 2:
The magnetic field system replaces the time-intensive mechanical filing and checking process with an instantaneous magnetic holding mechanism that achieves and maintains precision without iterative adjustments.
3Reliability
If conventional locking bolt with groove engagement is used to secure blade, then reliability is improved, but device complexity increases due to additional components
Solution Approach 1:
The patent replaces the mechanical locking bolt and groove engagement system with a magnetic field-based retention system. The magnets provide reliable blade holding through magnetic attraction without requiring additional mechanical components, thereby maintaining reliability while reducing device complexity.
Solution Approach 2:
The invention extracts and eliminates the locking bolt and groove components from the system, retaining only the essential magnetic elements needed for both positioning and retention functions, thus simplifying the overall device structure.
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
Reduces labor and time required for squaring, leading to significant cost savings and improved efficiency in achieving desired angular accuracy.
Implementation Method 1
at least one magnet mounted in the head and the blade is releasably retained in the slot by a magnetic force of the at least one magnet
Data Source
AI summary
A combination square is provided with a square head that includes a pair of bores extending through a blade receiving slot, a pair of pins, each pin having an eccentric outermost surface and being engaged in a corresponding one of the bores, and a ruled blade that is releasably engaged in the slot such that the relative angle between the head and the blade can be adjusted by rotating one or both of the pins about the axis of the corresponding bore.