Cam Lock Buckle Springless Slide Mechanism
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Solution Overview
Problem
The existing cam lock buckle requires a spring member to slide the fastening member with the belt, increasing the number of components and making it difficult to adjust the belt position without damaging it, due to the pressing force applied by the spring.
Innovation Solution
A cam lock buckle design that omits the spring member by using a slide mechanism with a recess and projection to facilitate belt adjustment, allowing the belt to be slid with less resistance and locked securely without damaging it, using a second member that can move between two positions to adjust the gap between the holding portion and the bottom portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring member is used to slide the fastening member with the belt, then the fastening member can be biased toward the bottom portion to maintain pressing force, but the number of components increases and belt damage risk increases
Solution Approach 1:
The invention extracts and removes the spring member from the buckle system. Instead of using a spring to provide biasing force, the design uses the inherent geometry of the cam mechanism and the interaction between the cam surface and cam follower to maintain pressing force during belt sliding, thereby reducing component count while preserving functional reliability
Solution Approach 2:
The cam mechanism is designed to automatically maintain pressing force through its geometric configuration. As the cam rotates during belt insertion and sliding, the cam surface naturally maintains contact pressure with the cam follower without requiring an external spring or elastic element, enabling the system to self-regulate pressing force
2Reliability
If a spring member presses the fastening member toward the bottom portion, then the belt can be held firmly, but position adjustment becomes difficult and belt may be damaged
Solution Approach 1:
The invention implements dynamic pressing force control through the cam mechanism. During normal operation, the cam maintains firm pressing force on the belt. During position adjustment, when the belt is pulled in the loosening direction, the cam rotates to a position where the pressing force is naturally reduced, allowing easy belt repositioning without damage, thus providing both firm holding and easy adjustment
3Reliability
If the fastening member is pressed toward the bottom portion by a spring member, then the belt is locked securely, but the number of components increases
Solution Approach 1:
The invention removes the spring member entirely from the locking mechanism. The secure locking function is achieved through the cam mechanism's geometric design, where the cam surface and cam follower create sufficient friction and mechanical interference to securely hold the belt in position without requiring additional elastic components
Solution Approach 2:
The cam mechanism acts as an intermediary between the belt and the fastening member. Through the cam surface-cam follower interaction, the system transfers and amplifies forces to achieve secure locking, replacing the need for a spring-mediated force transmission system
Data Source
AI summary
In a cam lock buckle, a slide mechanism holds a movable member so that the movable member can slide between a first position at which a shaft is located close to a first end of an elongated hole and a second position at which the shaft is located close to a second end of the elongated hole. A gap defined between a holding portion and a bottom portion when the movable member is slid to the second position is narrower than a gap defined between the holding portion and the bottom portion when the movable member is slid to the first position. One of the holding portion and the bottom portion facing the holding portion is provided with a concave groove and the other of the holding portion and the bottom portion is provided with a convex tread that pushes a part of the belt into the concave groove.