Shaft Arrangement for Locking Device Versatility
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Solution Overview
Problem
Locking devices often become overly complex and lack versatility, making it difficult to change their function or allow for unrestricted movement between parts, particularly in mechanisms involving linked elements that transmit force and rotation.
Innovation Solution
A shaft arrangement with a rotatable shaft coupling and a hollow shaft that includes a play, allowing independent rotation while maintaining force transmission, enabling the shaft and shaft coupling to rotate in one direction without affecting each other, thus allowing for versatile construction and easy installation in locking devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking device comprises multiple movable internal parts to achieve locking function, then the locking function is achieved, but the mechanism becomes very complicated
Solution Approach 1:
The locking device is divided into modular components: a housing, a bolt assembly, and a shaft arrangement. Each component performs a specific function independently, allowing the complex locking mechanism to be understood and manufactured as separate units that assemble together, thereby reducing overall system complexity while maintaining reliability
Solution Approach 2:
The shaft arrangement serves multiple functions: it transmits rotational movement from the handle to retract the bolt, and simultaneously allows unrestricted rotation in the opposite direction without affecting the bolt. This multi-functionality reduces the need for additional separate components, simplifying the overall mechanism
2Force
If links are connected and jointly movable to transfer force or movement, then force transmission is achieved, but the ability to allow unrestricted movements is limited
Solution Approach 1:
The shaft arrangement dynamically switches between two states: (1) force-transmitting engagement when the handle rotates in the opening direction to retract the bolt, and (2) disengaged state allowing unrestricted rotation when the handle rotates in the opposite direction. This dynamic adaptability resolves the contradiction between force transmission and movement freedom
3Ease of operation
If the handle is connected to retract the bolt with opening movement, then bolt retraction is achieved, but rotation in opposite direction affects the bolt
Solution Approach 1:
The shaft arrangement acts as an intermediary between the handle and the bolt. It selectively transmits rotational movement from the handle to the bolt only when needed for retraction, while blocking or decoupling the transmission when the handle rotates in the opposite direction. This intermediary function allows the handle to rotate freely in both directions without adversely affecting the bolt position
Data Source
AI summary
The invention relates to a locking device comprising a rotatable shaft coupling (19, 63) provided with a hollow (21, 65) and a shaft arrangement (3, 61) comprising a shaft (25, 71) arranged in the hollow and which connects the shaft and the shaft coupling so that they are jointly rotatable for transmission of at least one rotational movement or rotational force between the shaft and the shaft coupling. The invention also relates to a shaft arrangement (3, 61) shaped to be connected with a locking device comprising a rotatable shaft coupling provided with a hollow.