Roller Bolt Snap Ring Axial Adjustment
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Solution Overview
Problem
Existing roller bolt designs face issues with manufacturing complexity, high rolling friction, and limited adjustability due to manufacturing tolerances and gravitational shifts, leading to ineffective locking engagement and increased wear.
Innovation Solution
A roller bolt design utilizing a snap ring for angular support on the collar bolt, allowing for simple attachment and axial adjustment of the roller, with a flange for contact pressure adjustment and a stepped bore for secure fixation, enabling continuous adjustment and reduced friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a roller is rotatably mounted on a collar bolt with a threaded connection, then the roller can be adjusted to changing distances, but the adjustment is time-consuming and the production is complex
Solution Approach 1:
The patent removes the threaded connection from the collar bolt, extracting the complex adjustment mechanism. Instead, a simple snap ring provides axial positioning of the roller on the collar bolt, eliminating the need for threading while maintaining adjustability through the snap ring's elastic engagement.
Solution Approach 2:
The patent changes the connection parameter from a threaded mechanical engagement to a snap ring elastic engagement. This allows the roller to be positioned at different axial locations on the collar bolt simply by moving the snap ring, providing adjustment without complex threading operations.
2Ease of manufacture
If a snap ring is used to support the roller on the collar bolt, then manufacturing is simplified, but the roller needs secure axial fixation
Solution Approach 1:
The patent uses a snap ring, which is a flexible elastic component, to provide axial fixation of the roller on the collar bolt. The snap ring's elasticity allows it to engage with the collar bolt and roller, providing secure positioning without complex rigid fastening mechanisms, thus maintaining both manufacturing simplicity and fixation reliability.
Data Source
Figure 1~3
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Figure 7
AI summary
The invention relates to a roller bolt (1) of locking fittings for windows or doors, comprising a collar bolt (2) that is in particular fastened to an adjustable driving rod and penetrates a longitudinal slit of a face plate rail of the locking fitting, and comprising a roller (3) rotatably supported on a shaft (8) of the collar bolt (2), for the axial latching of said roller a detent projection (9), which is under spring action and can give way radially, being provided on one of the roller bolt parts (for example on the roller (3)), which are rotatably connected to each other, wherein the detent protrusion is configured as a retaining ring (9), which is active between the roller (3) and the collar bolt (2). The retaining ring (9) is fixed between two radially protruding collars (12, 13) of the collar bolt (2) and/or the roller (3) in the axial direction. In order to achieve simple production of the roller bolt, and in order to prevent friction when locking the roller bolt, it is provided that at least one of the collars (13) is produced by an elastic deformation of the roller (3).