Bogey Lock Mechanism for Hanger Bolt Security
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing bogey systems for folding panels face challenges in securely locking and adjusting hanger bolts due to pivotal movement, which can lead to unscrewing over time and uneven load distribution, causing bending moments and potential fatigue in the hanger bolt.
Innovation Solution
A bogey system with a single set of support wheels and a threaded retainer for the hanger bolt, featuring a lock mechanism with a keeper that slides to engage and lock the bolt against rotation, and an actuator button to move the keeper between engaged and free positions, ensuring secure locking and height adjustment without restricting pivotal movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional bogey system with multiple support wheels and direct bolt support is used, then the hanger bolt is directly supported by the body, but this causes uneven load distribution and bending moments that lead to fatigue and potential bolt failure over time
Solution Approach 1:
The support function is segmented between multiple wheels and the hanger bolt. The wheels bear the primary load through the track, while the bolt provides suspension and positioning. This segmentation distributes loads more evenly, reducing bending moments on the bolt and preventing fatigue failure.
Solution Approach 2:
The track acts as an intermediary element between the bogey body and the hanger bolt. The track provides a stable mounting surface for the wheels and transfers loads away from the bolt, reducing direct stress on the bolt and improving its fatigue resistance.
2Ease of operation
If the hanger bolt is made adjustable for height, then precise positioning is achieved, but the bolt becomes vulnerable to unscrewing due to pivotal movement over time
Solution Approach 1:
The lock mechanism transitions between locked and unlocked states dynamically. When locked, it prevents pivotal movement and unscrewing of the bolt. When unlocked, it allows height adjustment. This dynamic state change enables both security and adjustability as needed.
Solution Approach 2:
The locking function is extracted as a separate mechanism (keeper engaging with the bolt) rather than being integrated into the bolt itself. This allows the bolt to remain adjustable while providing independent security against unscrewing through the lock mechanism.
3Device complexity
If the retainer is positioned close to the wheels for compact design, then the bogey structure is simplified, but the hanger bolt cannot be securely locked against rotation
Solution Approach 1:
The lock mechanism operates in a different spatial dimension from the wheels. The keeper slides along the bolt axis (one dimension) while the bolt rotates around the retainer (another dimension). This dimensional separation allows secure locking without increasing overall structural complexity.
Solution Approach 2:
The lock mechanism is nested within the existing bogey structure. The keeper is retained within the body housing, and the collar fits onto the bolt shaft, creating a compact nested arrangement that provides secure locking without adding external complexity.
4Ease of operation
If the wheels are positioned close to the jamb for compact folding panel operation, then the panel can close tightly, but the wheels obstruct the panel edge from sealing against the jamb
Solution Approach 1:
The wheels are positioned asymmetrically relative to the hanger bolt, with the bolt cantilevered forward of the wheel axles. This asymmetric arrangement allows the panel edge to clear the wheels during closing, enabling tight sealing against the jamb without wheel obstruction.
Solution Approach 2:
Instead of positioning the bolt directly above or behind the wheels (conventional arrangements), the bolt is inverted to a cantilevered position forward of the wheels. This inversion creates clearance between the panel edge and wheels, allowing proper sealing operation.
Data Source
AI summary
A bogey includes a body having only a single set of support wheels, with one wheel positioned either side of the body. A threaded retainer is arranged for threaded engagement with a shaft of a hanger bolt. The retainer is located in spaced relation from the wheels, whereby the bolt is cantilevered from the body.