Keyless Blade Clamp for Power Tool
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Solution Overview
Problem
Reciprocating saws often require specialized tools like allen wrenches or keys for blade replacement and securing, which can be inconvenient and time-consuming.
Innovation Solution
A keyless blade clamp mechanism that includes a rotatable collar and a locking member, actuated by a mechanism that moves between engaged and disengaged positions to securely attach or release the saw blade from the spindle without the need for tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional blade mounting system using an allen wrench or special key is used, then the blade can be securely attached to the spindle, but the blade replacement process becomes time-consuming and inconvenient
Solution Approach 1:
The blade clamp mechanism is designed to be self-operating through a cam lever system. When the lever is actuated, the cam surface automatically moves the clamp from a released position to a clamped position, securing the blade without requiring any external tools or keys. The mechanism uses the lever's movement to directly drive the clamping action through cam-follower interaction.
Solution Approach 2:
The blade clamp mechanism transitions from a static keyed connection to a dynamic cam-based system. The cam lever can be quickly actuated to change the clamp's position, allowing rapid blade replacement. The cam surface geometry enables smooth transition between states, and the spring provides dynamic tension to maintain secure attachment during operation.
2Ease of operation
If a keyless blade clamp mechanism is used, then blade replacement becomes quick and tool-free, but the mechanism complexity increases with additional components like cam levers and springs
Solution Approach 1:
The blade clamp mechanism combines multiple functions into a single integrated assembly. The cam lever simultaneously controls the clamp's positioning, the spring provides both tension and return force, and the cam surface guides the entire motion sequence. This merging reduces the need for separate adjustment mechanisms and simplifies the overall operation to a single lever action.
Solution Approach 2:
The cam surface acts as an intermediary between the lever's linear motion and the clamp's radial movement. Instead of directly connecting the lever to the clamp, the cam surface translates the lever's arc-shaped path into the precise radial motion needed to engage or disengage the blade clamp, enabling smooth and controlled operation.
3Productivity
If a cam-based quick-release mechanism is used, then blade replacement speed increases, but the mechanism requires more space within the tool housing
Solution Approach 1:
The blade clamp mechanism is nested within the existing tool housing structure. The cam lever rotates within the available angular space, and the clamp assembly is positioned within the housing cavity near the spindle. The spring is contained within the mechanism's footprint, and all components are arranged to utilize the three-dimensional space efficiently without requiring external extensions.
Data Source
AI summary
A reciprocating tool that includes a spindle that reciprocates with respect to a housing within a cavity of the housing. The reciprocating tool includes a blade clamp mechanism actuator coupled to the housing for movement with respect the housing between first and second positions. The spindle reciprocates with respect to the blade clamp mechanism actuator. A blade clamp mechanism is coupled to the spindle for reciprocating movement therewith, and the blade clamp mechanism is configured to attach the saw blade to the spindle. The blade clamp mechanism includes a collar mounted on the end of the spindle, and the collar is rotatable about the longitudinal axis of the spindle between an engaged position and a disengaged position in response to movement of the blade clamp mechanism actuator between the first position and the second position.