Collapsible Stand Bracket Assembly With Stable Bar Locking
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Solution Overview
Problem
Existing bracket assemblies and retaining devices for collapsible stands, such as those for circular sawing machines, face safety issues due to inadequate cam force and poor positioning, leading to potential accidents when handles are not secured and pivot upward or downward during operation.
Innovation Solution
The proposed solution involves a bracket assembly with an elongated shell and curved members that engage bars on a collapsible stand, utilizing a link and actuation members with ramps and biasing elements to securely lock and unlock bars, and a retaining device with a housing and clamping mechanism to stabilize the stand, enhancing safety and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a bracket assembly with handle is used for supporting a machine on a collapsible stand, then the machine can be supported and moved, but the handle may pivot upward or downward during operation causing the long beam to hit the handle accidentally
Solution Approach 1:
The disturbing handle is extracted from the bracket assembly and integrated into the extending rod mechanism. The handle is now part of the extending rod assembly rather than a separate bracket component, allowing it to be securely positioned when not in use and preventing accidental contact with the long beam during operation.
Solution Approach 2:
A retainer component is introduced as an intermediary element to secure the handle in a predetermined position. The retainer engages with the handle and extending rod mechanism, acting as a mediator that prevents unwanted handle movement while allowing controlled operation when needed.
2Adaptability or versatility
If an existing retaining device with cam mechanism is used for the extending rod, then the rod can be extended and retracted, but the cam provides insufficient positioning force causing vibration during urging action
Solution Approach 1:
The inadequate cam mechanism is extracted from the retaining device. The cam is removed entirely and replaced with a new retaining mechanism that uses a retainer with a hole receiving the cam portion of the handle, providing superior positioning stability without the vibration problems of the cam-based system.
Solution Approach 2:
The cam-based mechanical retention system is replaced with a hole-and-camportion reception mechanism. This substitution eliminates the problematic cam urging action that caused vibration, while maintaining the ability to extend and retract the rod through handle pivoting motion.
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
The solution effectively locks and unlocks bars to prevent accidental collisions, improving safety and operational reliability by providing a secure and stable platform for power tools during use.
Implementation Method 1
a biasing member (66) put on the protrusion (64) and biased between the first stop member (23) and the first actuation member (60)
Implementation Method 2
a plurality of ramps (54, 63) equally spaced on one end surface, and a riser (541, 631) on an outer surface formed with one of the ramps
Data Source
AI summary
A bracket assembly is provided with a shell, a pivotal first curved member on one end of a recessed shell bottom, a pivotal second curved member on the other end of the shell bottom, a link including a slot, a first pin driven through the first curved member and the slot to fasten the first curved member and the link together, and a third hole at an other end, a cylindrical first actuation member, a cylindrical second actuation member, a second pin for fastening the first actuation member and the link together; a biasing member biased between the first stop member and the first actuation member; and a knob at a cap. A retaining device is also provided so that the sliding tube can slide in a transverse channel of retaining device, thereby adjusting length of the sliding tube.