Lifter Device Unlocking Stroke Reduction via Pawl Release Mechanism
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Solution Overview
Problem
The existing lifter devices require a large movement amount for unlocking, resulting in a small feed rotation movement of the gear, which increases the stroke required for the unlocking operation of the operation handle.
Innovation Solution
A lifter device with a pinion gear and a rotation control device that includes a lock pawl with a pressed portion, where the release member presses the pressed portion to efficiently disengage the lock pawl from the base gear, reducing the stroke needed for unlocking, and a configuration that increases the force for disengagement relative to the frictional force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lock pawl is disengaged by rotating the operation handle in the existing lifter device, then the lock pawl can be released from the gear, but the movement amount required for unlocking is large and the feed rotation movement amount of the gear is small
Solution Approach 1:
The patent introduces a release member as an intermediary component between the operation handle and the lock pawl. This release member converts the rotational movement of the operation handle into linear movement that directly pushes the lock pawl out of engagement with the gear, eliminating the need for large rotational strokes and enabling efficient feed rotation of the gear
2Reliability
If the lock pawl is positioned to mesh with the base gear, then the rotation of the pinion gear is stopped, but the frictional force prevents smooth disengagement
Solution Approach 1:
The patent applies curvature to the contact surfaces between the lock pawl and the release member. The inclined surface of the release member and the corresponding surface of the lock pawl are designed with curved geometries that facilitate smooth relative movement during disengagement, reducing frictional resistance while maintaining reliable locking when engaged
Data Source
AI summary
Pawls in a lifter device, having: outer teeth that are rotatably supported by shafts for in lock plates and are meshed with inner teeth of a base; and pins that are provided in an intermediate section in the radial direction, between the shaft center of the shafts and the teeth tips of the inner teeth, and are pressed in the rotation direction by a rotation transmittance plate during a release operation. The pins have a protruding shape that protrudes from the pawls in the thrust direction.