Circular Saw Movable Handle with Locking Assembly
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Solution Overview
Problem
Circular saws with integral handles lack adjustability, leading to uncomfortable and suboptimal handle positions during cutting operations, and existing solutions require additional components or fasteners that can be lost or damaged.
Innovation Solution
A movable handle arrangement for circular saws that is pivotable about the saw blade axis, with a locking assembly providing frictional and positive engagement, and a wiring arrangement to connect the switch to the motor, ensuring secure operation and preventing inadvertent activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the handle is integrally formed with the housing, then the structure is simple and robust, but the handle position cannot be adjusted relative to the housing
Solution Approach 1:
The handle is made movable relative to the housing through a pivot connection, allowing the handle position to be dynamically adjusted between a push handle position and a top handle position. The locking assembly enables the handle to be secured at different angular positions, providing adaptability while maintaining structural simplicity.
2Ease of operation
If the handle is integrally formed with the housing, then the manufacturing is simple, but the handle position changes when depth of cut is adjusted
Solution Approach 1:
The handle is designed to be independently adjustable from the depth of cut mechanism. The pivot connection allows the handle to be repositioned without adjusting the depth of cut, and the locking assembly secures the handle at the desired position, ensuring operational stability while maintaining manufacturing simplicity.
3Adaptability or versatility
If two separate handles are provided, then the operator can choose the optimal handle configuration, but additional components must be stored and may be lost or damaged
Solution Approach 1:
Instead of providing two separate handles, the invention uses a single handle that can be dynamically repositioned between push handle and top handle configurations. The locking assembly allows the handle to be secured at different positions, providing the versatility of multiple handle types while eliminating the need for multiple physical components.
4Reliability
If additional fasteners are required for handle adjustment, then the handle can be securely positioned, but the risk of loss or damage increases
Solution Approach 1:
The locking assembly integrates the fastening function directly into the handle mechanism. The movable handle engages with the housing through interlocking features that secure the handle at different positions without requiring separate fasteners. This merging of functions maintains positioning security while eliminating additional components.
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
Enables the operator to adjust the handle for comfort and control, maintains optimal position with depth adjustments, and eliminates the need for additional components, reducing the risk of loss or damage.
Implementation Method 1
The locking assembly may provide a frictional engagement between the handle and the housing
Implementation Method 2
includes a clamping member that releasably applies a clamping force to the housing to lock the handle in a position
Implementation Method 3
includes inter-engaging teeth formed on both the handle and the housing
Data Source
AI summary
A power tool includes a handle including a support portion movably supportable on a housing portion and extending substantially about the circumference of the housing portion. The support portion may include a second end movable relative to a first end such that the support portion selectively applies a force to the housing portion. The tool may include a bevel angle detent mechanism in which one of the detent member and the recess is angularly adjustable relative to the associated one of the detent support and the recess support to adjust the predetermined bevel angle position. A bevel angle detent mechanism may include an engagement operating assembly operable between a detent engagement-enabled condition, in which the detent member is engageable in the recess, and a detent engagement-prevention condition, in which the detent member is prevented from engaging the recess. The tool may include a spindle lock assembly.