Winch Hand Crank Deactivation Mechanism for Backstop Safety
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Solution Overview
Problem
Generic winches pose a safety risk as the hand crank can rotate when the traction mechanism is pulled off, potentially injuring nearby individuals, and there is a risk of accidental activation of the freewheeling mode if the hand crank is not properly deactivated before releasing the backstop.
Innovation Solution
A winch design that includes a deactivatable hand crank and a switching element that prevents actuation of the release element unless the hand crank is deactivated, ensuring the hand crank is inactive before switching to freewheeling mode, thereby preventing accidental injuries and ensuring safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the hand crank is activated during freewheeling operation, then the drum can be manually rotated to wind the traction means, but the hand crank may rotate uncontrollably when the traction mechanism is pulled off, causing injury to nearby persons
Solution Approach 1:
A switching element is introduced as an intermediary between the operator and the release element. This switching element must be activated to enable the release element to disengage the backstop, thereby preventing accidental hand crank rotation while maintaining manual winding capability when properly activated
Solution Approach 2:
The switching element requires preliminary activation before the release element can be operated. This preliminary action ensures that the operator intentionally prepares the system for freewheeling mode, preventing accidental disengagement of the backstop and uncontrolled hand crank rotation
2Productivity
If the release element is made easily accessible for quick backstop release, then the backstop can be rapidly disengaged for freewheeling operation, but the operator may forget to deactivate the hand crank first, leading to accidental injury
Solution Approach 1:
The switching element serves as a mandatory intermediary step between the operator and the release element. This intermediate step ensures that the operator consciously activates the switching element before accessing the release element, preventing forgotten hand crank deactivation while maintaining quick release capability
Solution Approach 2:
Activating the switching element is required as a preliminary action before the release element can be operated. This preliminary step creates a deliberate sequence that prevents accidental or forgotten hand crank deactivation, ensuring safety is checked before backstop release
3Object-affected harmful factors
If the hand crank is completely removed from the winch, then the injury risk is eliminated, but the winch cannot be manually operated to wind the traction means
Solution Approach 1:
The hand crank is designed to be dynamically positionable - it can be attached to the drum for manual winding operations and removed or positioned in a safe location when not in use. This dynamic configuration allows the hand crank to serve its function when needed while eliminating injury risk when not needed
Data Source
Figure 1~2
Figure 3~4
AI summary
The spanner has a return lock (9) that locks rotation of a drum (3) in a withdrawal direction of a traction unit (14). A release element (10) releases the return lock. A crank handle (7) is deactivated by a loosening of a mechanical linkage i.e. gear box terminal (5), between the crank handle and the drum. A switching element (11) prevents actuation of the release element when the crank handle is activated. The switching element is reversible between a freewheel position in which the return lock is resolved, and a locking position in which the return lock is activated.