Wedge Clamp for Industrial Safety Guard Locking
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Solution Overview
Problem
Existing safety guard locking systems, such as those using nuts and bolts or tie wraps, pose risks of lost hardware and inadequate security, particularly when accessing equipment at heights, and do not sufficiently ensure that workers use a tool to remove the guard, compromising safety practices.
Innovation Solution
A wedge clamp system comprising a base wedge member and a cooperating drive wedge member that moves between open and locked positions, secured by a set screw and optional tie wrap, ensuring secure locking and easy removal/reinstallation, with a pin engaging notches for additional stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nuts and bolts are used to lock the safety guard, then the guard is securely locked, but the hardware can be lost or become caught in the equipment
Solution Approach 1:
The patent removes traditional locking hardware (nuts and bolts) from the system and replaces it with a wedge clamp mechanism that locks through geometric interference and friction. The wedge clamp integrates the locking function into the clamp body itself, eliminating separate hardware components that could be lost or misplaced.
Solution Approach 2:
The wedge clamp combines the clamping and locking functions into a single integrated component. The drive wedge member and base wedge member work together as a unified system where the wedging action simultaneously provides both clamping force and locking capability, eliminating the need for separate hardware.
2Ease of operation
If a tie wrap is used to secure the wedge clamp, then the clamp is locked, but inspectors do not consider it sufficient and it does not require a tool for removal
Solution Approach 1:
The set screw acts as an intermediary component that provides the required tool-removal mechanism. When engaged, the set screw prevents the drive wedge member from rotating back to the open position, requiring a tool (screwdriver) to remove. This intermediary element bridges the gap between easy operation and inspector approval.
Solution Approach 2:
The system allows parameter changes in the locking mechanism - the set screw can be engaged or disengaged to change the locking state. When engaged, it provides tool-requirement compliance; when disengaged, it allows easy removal. This parameter change capability satisfies both ease of operation and locking sufficiency requirements.
3Reliability
If the safety guard is locked with hardware, then it is secure, but workers must remove hardware completely which can fall and become lost
Solution Approach 1:
The wedge clamp mechanism is self-contained and self-locking through its geometric design. The wedging action creates friction and mechanical interference that automatically maintains the locked state without requiring additional hardware to service or monitor. The system serves itself by maintaining security through its inherent design rather than requiring external hardware components.
4Reliability
If nuts and bolts are used, then the guard is securely locked, but removing them completely is inconvenient when equipment is at height
Solution Approach 1:
The wedge clamp segments the locking mechanism into two parts: the wedge members that provide locking through geometric interference, and the set screw that provides tool-requirement compliance. This segmentation allows the main locking function to remain engaged without requiring complete removal of all components, reducing removal time when accessing equipment at height.
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 wedge clamp system provides a secure and convenient means to lock safety guards, preventing accidental loss of hardware and ensuring that workers use a tool to access equipment, thereby enhancing safety practices and reducing the risk of injury.
Implementation Method 1
One embodiment of the set screw can prevent movement of the drive wedge member through pressure and/or friction.
Data Source
AI summary
A device for securing safety guards around machinery is described which includes a portable wedge clamp device which is inserted through both the safety guard and the post. The portable wedge clamp device includes a base wedge member and a corresponding drive wedge member. A set screw is used to prevent the drive wedge member from moving and becoming unlocked.