Axially Adjustable Roller Closure Bolt for Window Locking
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Solution Overview
Problem
Existing locking bolts face challenges in adjusting to changing distances between the sash and frame due to manufacturing tolerances and gravitational shifts, requiring costly and time-consuming manual adjustments and plastic deformations, which are inefficient and expensive.
Innovation Solution
A locking bolt design featuring a sleeve with latching tongues that engage in a constriction of the collar bolt, allowing for easy assembly without deformation, and an axially adjustable roller that can automatically adapt to different distances using a resilient sleeve and spring steel material, ensuring secure fixation and reduced friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a collar bolt with a roller rotatably mounted thereon is used, then the locking bolt can be produced and assembled easily, but the distance between the locking bolt and latch engagement changes over time due to manufacturing tolerances and gravitational shifts, requiring costly and time-consuming manual adjustments
Solution Approach 1:
The roller is designed with axial play (axial movement capability) relative to the collar bolt, allowing it to dynamically adjust its position along the axial direction. This dynamic adjustment compensates for distance changes caused by manufacturing tolerances and gravitational shifts, eliminating the need for costly manual adjustments while maintaining easy assembly
Solution Approach 2:
The roller's axial position parameter is made variable through the axial play design, enabling automatic adaptation to different distance requirements. The roller can shift axially within defined limits to maintain proper engagement distance, resolving the precision issue without complicating the manufacturing process
2Adaptability or versatility
If the roller is provided with axial play to adapt to changed distances, then automatic adjustment is achieved, but the adjustment is limited because the head of the locking bolt must hit the insertion bevel of the bolt engagement
Solution Approach 1:
The adjustment mechanism utilizes the axial dimension (longitudinal direction) of the roller, allowing movement along the axis of the collar bolt. By employing a conical insertion bevel, the system converts radial forcing into axial displacement, maximizing the adjustment range within the available space and enabling broader adaptation to distance changes
3Manufacturing precision
If plastic deformation is used to adjust the locking bolts, then adaptation to changing distances is achieved, but the process is very time-consuming and expensive due to the large number of locking bolts required
Solution Approach 1:
The roller automatically adjusts its own axial position through the axial play mechanism when installed on the collar bolt. This self-adjusting capability eliminates the need for external plastic deformation processes, enabling rapid adaptation to distance changes without time-consuming manual intervention or expensive deformation equipment
Solution Approach 2:
The invention replaces the plastic deformation mechanical process with a friction-based axial sliding mechanism. The roller shifts axially along the collar bolt through controlled friction and geometric constraints, achieving the same adaptation goal much faster and more efficiently than plastic deformation
4Reliability
If a threaded connection is used to fix the roller on the collar bolt, then secure fixation is achieved, but the manual adjustment is time-consuming and the manufacture is expensive due to the required thread
Solution Approach 1:
The invention extracts and eliminates the threaded connection from the design, replacing it with a simpler friction-based axial sliding mechanism combined with a stop element. This removal of the threading requirement significantly reduces manufacturing complexity and cost while maintaining secure fixation through the friction and geometric constraints of the axial play system
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design simplifies assembly, reduces production costs, enhances burglary protection, and allows for continuous axial displacement with minimal force, maintaining secure positioning even when the locking bolt is vertical, accommodating coarser tolerances and improving manufacturing efficiency.
Implementation Method 1
the sleeve is made of spring steel... the roller can be displaced axially relative to the collar bolt, and can, if necessary, automatically adapt to a different distance between the frame and a wing
Implementation Method 2
The latching device consists of a sleeve which is provided with latching tongues protruding from the lateral surface in the direction of the collar bolt and which engage in a constriction of the collar bolt
Data Source
Figure 1~3
Figure 4~7
Figure 8
AI summary
The invention relates to a closure bolt of locking fittings for windows or doors, with a collar bolt (2) which is fastened to a displaceable driving rod, and with a roller (3) which is mounted rotatably on the collar bolt (2), in particular in which the roller (3) has a mushroom-head shape in which that end (11) of the roller (3) which is remote from the driving rod is provided with a head (13) which is enlarged in diameter in comparison to the neck (12), and wherein the roller (3) and the collar bolt (2) can be fixed in relation to each other via a latching device. In order to develop a closure bolt in such a manner that the latter can be produced in a simple manner and, at the same time, traces of wear on the locking engagement means are avoided by the roller, it is provided that the latching device comprises a sleeve (15) which is provided with latching tongues (17) which protrude from the circumferential surface (30) in the direction of the collar bolt (2) and engage in a constriction (18) of the collar bolt (2).