Shift-Brake Twin-Shaft Hinge Locking Assembly
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional double rotary shaft hinge devices face challenges in reducing volume, achieving sequence rotational control, and maintaining smooth pivotal motion due to the configuration of the movable wheel between linking wheels, which affects the design of small, delicate products and introduces frictional issues.
Innovation Solution
The shift-brake device incorporates a locking assembly with a base seat, pressing plate, and shaft sleeves, allowing the first and second pivot shafts to pivot synchronically, with the pressing plate's convex portions embedding into concave portions of the shaft sleeves to limit rotation, thereby controlling pivotal angles and maintaining a constant spacing between the shafts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a movable wheel is configured between linking wheels to control sequence rotation, then sequence rotational control is achieved, but the volume increases and the distance between pivot shafts cannot be shortened
Solution Approach 1:
The patent removes the movable wheel component from the system entirely. Instead of using a movable wheel between linking wheels to control sequence rotation, the invention uses a different mechanism involving a brake disc, brake arm, and elastic component that directly engages with the pivot shafts, thereby eliminating the need for the movable wheel and reducing overall volume.
Solution Approach 2:
The brake arm is disposed within the space between the base body and the linking wheel, nesting the braking mechanism within existing structural spaces. The elastic component is sleeved on the pivot shaft, utilizing the radial space around the shaft. This nested arrangement allows the sequence control function to be achieved without increasing the overall volume of the hinge device.
2Length of moving object
If the distance between pivot shafts is reduced for small product design, then product size is minimized, but sequence rotational control becomes difficult to implement
Solution Approach 1:
The brake arm pivots about a pivot point that is offset from the line connecting the two pivot shafts, utilizing the third dimension (vertical direction) to provide mechanical advantage. This allows the brake arm to effectively control both pivot shafts even when they are positioned close together horizontally, enabling sequence rotational control without requiring large horizontal spacing.
3Adaptability or versatility
If conventional linkage mechanism is used for sequence control, then rotational control is achieved, but frictional force affects pivotal smoothness
Solution Approach 1:
The patent replaces the traditional movable wheel-based mechanical linkage with a friction-based braking mechanism. The brake arm can selectively engage with or release from the pivot shafts, providing control through controlled friction rather than through complex mechanical linkages. This substitution reduces the frictional resistance that would otherwise occur in multiple mechanical contact points of a linkage system.
Data Source
AI summary
A shift-brake device includes a locking assembly and two pivot shafts. The locking assembly includes a base seat, a pressing plate and two shaft sleeves. The pressing plate pivotally connected to the base seat is configured with two sleeve holes, and convex portions, the two shaft sleeves are respectively configured with sleeve portions. The two shaft sleeves are configured with circular flanges having concave portions. The pivot shafts arranged on the base seat and the pressing plate are linked with the shaft sleeves. When one pivot shaft is pivoted, the connected shaft sleeve is synchronically driven to cause a concave portion thereof to be deviated from a corresponding convex portion of the pressing plate, the circular flange of the shaft sleeve pushes against the convex portion of the pressing plate to incline the pressing plate, thus to cause the other shaft sleeve unable to be pivoted.