Cam Lever Handlebar Mount With Adjustable Clamping Jaws
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Solution Overview
Problem
Conventional handlebar accessory mounting arrangements, such as ratchet and pawl or adhesive-based systems, face issues of complexity, high cost, and vulnerability to breakage or unintended release due to vibration or sudden movement.
Innovation Solution
A cam lever operated accessory gripping mechanism with a threaded stud, dowel, and biasing spring is used to securely attach accessories to a handlebar, employing an overcenter latching effect and adjustable clamping jaws to ensure reliable attachment without damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ratchet and pawl arrangement is used to clamp the accessory, then the accessory can be securely held, but the device complexity and cost increase
Solution Approach 1:
The patent extracts the essential clamping function from the complex ratchet and pawl mechanism, retaining only the necessary elements to achieve secure holding without the unnecessary complexity. The cam lever mechanism provides the required clamping action through a simplified geometric arrangement rather than a multi-component ratchet system.
Solution Approach 2:
The patent employs a simple cam lever mechanism that can be manufactured at low cost using basic machining operations. The design accepts that the mounting mechanism may need replacement over time but prioritizes low initial cost and simplicity over long-term durability, using readily available materials and standard fasteners.
2Reliability
If a ratchet and pawl arrangement is used to clamp the accessory, then the accessory can be securely held, but the vulnerability to breakage increases
Solution Approach 1:
The patent removes the fragile ratchet and pawl components that are prone to breakage, keeping only the essential clamping function. The cam lever mechanism uses fewer moving parts and simpler geometry, reducing the points of potential failure and overall vulnerability to breakage while maintaining the necessary holding security.
3Ease of operation
If adhesive-based mounting arrangements are used, then the accessory can be quickly attached and released, but the holder may become disengaged due to vibration or sudden movement
Solution Approach 1:
The cam lever mechanism is pre-positioned and spring-loaded to automatically engage with the accessory upon attachment. The spring applies preliminary clamping force that secures the accessory before any vibration or movement occurs, eliminating the need for separate securing actions while maintaining quick operation.
Solution Approach 2:
The spring-loaded cam lever mechanism automatically adjusts and maintains clamping pressure on the accessory without requiring additional user intervention. The system self-regulates the clamping force to maintain secure attachment during vibration and movement, while still allowing quick release when the lever is actuated.
4Reliability
If the clamping force is increased to securely grip the accessory, then the accessory is held more firmly, but the accessory may be damaged
Solution Approach 1:
The patent applies clamping force through distributed contact surfaces on the cam lever and accessory interface, rather than concentrated point loads. The local geometry of the cam surface and accessory engagement features spreads the force across multiple contact points, achieving firm grip while preventing damage to the accessory surface.
Solution Approach 2:
The cam mechanism transforms the applied lever force into optimized clamping pressure through its geometric conversion ratio. By changing the cam angle and contact surface parameters, the system achieves the necessary grip firmness while controlling the pressure distribution to avoid exceeding the accessory's damage threshold.
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 provides a simple, secure, and adjustable mounting system that effectively grips accessories without causing damage, resisting unintended release and accommodating various devices and handlebar types.
Implementation Method 1
a biasing spring that extends between the first and second main body sections... The biasing spring extends, in this embodiment, in a coaxial manner relative to the threaded stud to urge the main body sections in an unclamping direction
Implementation Method 2
employing an overcenter latching effect... The camming surface of the camming lever, and/or the cam-engaging surface of the bulkhead, preferably is shaped such that continued turning after a maximum clamping force has been achieved will provides an overcenter latching effect that prevents release of the camming lever
Data Source
AI summary
A cam lever operated accessory gripping mechanism the gripping mechanism includes a cam lever, a threaded stud, a dowel fixed to a first end of the threaded stud, first and second relatively movable main body sections, the first of the main body sections including a handlebar bracket extension, a first clamping jaw for engaging a first side of the accessory, and an opening shaped to slidably receive the second main body section, and the second main body section including a bore and a slot for receiving a fastening member into which the threaded stud is threaded, and a second clamping jaw for engaging a second side of the accessory. The dowel is rotatably mounted in the camming lever, which has at least one overcenter camming surface that engages a cam-engaging surface of the first main body section, such that pivoting of the camming lever about the dowel in a first direction causes the dowel holding section of the camming level to move in an axial direction of the threaded stud, pulling the second main body section against a biasing force provided by a biasing spring extending between the first and second main body sections, in a direction that causes the second clamping jaw to move towards the first clamping jaw and thereby grip the accessory. Adjustment of the gripping mechanism to fit different accessories is accomplished by turning the threaded stud to cause axial movement of the follower insert and corresponding movement of the second main body section is a desired direction, to adjust the initial spacing of the first and second clamping jaws.