Head Replaceable Electric Tool Locking Mechanism Clearance Reduction
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Solution Overview
Problem
Existing multi-head power tools suffer from significant clearance issues between the working head and the tool body, leading to reduced efficiency and shortened service life due to fatigue wear and poor matching surfaces, which cannot be effectively compensated or adjusted.
Innovation Solution
A head replaceable electric tool with a safety mechanism featuring a locking device that includes a working head engagement device with rotating elements and a safety mechanism to securely lock the working head, reducing clearance and enhancing fatigue and wear resistance, while preventing accidental unlocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an open steel ring is used to connect the working head and tool body, then quick detachment is achieved, but the connection stability deteriorates due to line contact and small locking force
Solution Approach 1:
The patent transitions from line contact (1D) to surface contact (2D) by designing a clamping block with a clamping surface that contacts the working head connecting end over an area rather than at a single line or point. This dimensional change increases the contact area, distributes the locking force, and prevents loosening while maintaining quick detachment capability.
Solution Approach 2:
The patent introduces a clamping block as an intermediary component between the open steel ring and the working head connecting end. This clamping block acts as a mediator that converts the radial force from the steel ring into axial clamping force, creating a more reliable surface contact connection while preserving the quick release function.
2Area of stationary object
If a limiting ring with wedge-shaped block is used, then the matching surface area is increased, but clearance still exists due to running clearance between the limiting ring and tool body
Solution Approach 1:
The patent extracts the limiting ring from the connection system and replaces it with a locking device that has a locking surface directly engaged with the tool body. This removal eliminates the running clearance issue between the limiting ring and tool body, while the clamping block provides the necessary surface contact area for reliable connection.
3Reliability
If the working head and tool body are connected with tight fit, then connection stability is improved, but fatigue wear clearance develops during operation
Solution Approach 1:
The patent creates a dynamic compensation mechanism where the clamping block can move axially to maintain constant clamping force on the working head connecting end. This dynamic adjustment compensates for fatigue wear and clearance development over time, extending service life while maintaining connection stability throughout the tool's operational lifespan.
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 reduces clearance between the working head and the tool body, enhancing connection stability, extending service life, and preventing accidental startup by securely locking the working head, thus improving operational efficiency and safety.
Implementation Method 1
two states of opening and closing of an open steel ring are realized through its own elastic deformation relying on the open steel ring arranged in the tool body
Implementation Method 2
the locking device automatically returns to the engaged state by relying on a returning spring
Implementation Method 3
The screwing groove is in tight fit with the screwing convex rib when the locking device is in the locked state
Data Source
AI summary
The present disclosure provides a head replaceable electric tool with a safety mechanism, which has a tool body and at least one working head, the working head is detachable; the tool body has a machine body housing, a motor mounted in the machine body housing, and a working head engagement device arranged at an output end of the tool body; a switch body is arranged on the tool body; a button is arranged on the switch body; a locking device is arranged in the tool body; a main body of the locking device is arranged in the machine body housing and is arranged concentrically with the working head engagement device; the locking device is connected to an inner wall of the machine body housing through screw threads or a slope; and a safety mechanism for locking the button is arranged between the tool body and the working head.