Tool Holder Locking Sleeve with Ramp Guide for Easy Unlocking
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Solution Overview
Problem
Existing hand-held power tools with tubular tool holders require significant force to lock and unlock insert tools, leading to a cumbersome and inefficient process due to the lack of a efficient mechanism for shifting locking elements between locked and unlocked positions.
Innovation Solution
Incorporating a ramp-shaped guideway in the tool holder recess allows the locking element to transition from a locked to an unlocked position with reduced force, utilizing a spring-loaded pressure sleeve and locking sleeve to facilitate a smooth and adjustable unlocking process, enabling a one-handed insertion and easy operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional locking mechanism without a ramp-shaped guideway is used, then the locking device can hold the insert tool securely, but significant force is required to lock and unlock the insert tool
Solution Approach 1:
The patent employs a ramp-shaped guideway with a curved, inclined surface instead of a straight or flat path. This curved geometry allows the locking element to transition smoothly between locked and unlocked positions by converting axial force into radial movement, significantly reducing the force required from the user while maintaining secure locking.
Solution Approach 2:
The locking mechanism utilizes a dynamic ramp-shaped guideway that changes the direction of force during the locking and unlocking process. As the locking element moves along the inclined ramp surface, the mechanism dynamically transforms the applied axial force into radial displacement, enabling easy operation while maintaining secure locking engagement.
2Ease of operation
If a ramp-shaped guideway is introduced to reduce unlocking force, then the unlocking process becomes easier and smoother, but the device complexity increases
Solution Approach 1:
The patent integrates the ramp-shaped guideway directly into the existing tool holder structure, merging the guiding function with the holding structure. This combination approach adds the unlocking assistance feature without requiring separate, complex components, thereby minimizing the increase in device complexity while achieving smooth, easy unlocking operation.
Solution Approach 2:
The ramp-shaped guideway serves multiple functions simultaneously: it guides the locking element's movement, reduces the force required for unlocking, and maintains proper alignment during operation. By combining these functions into a single structural feature rather than multiple separate components, the patent achieves multi-functionality without proportionally increasing device complexity.
3Reliability
If the locking element is displaced along a ramp-shaped guideway, then the movement from locked to unlocked position is smooth and reliable, but the length of the guideway increases the recess dimension
Solution Approach 1:
The patent optimizes the geometric parameters of the ramp-shaped guideway, specifically the incline angle and curvature radius, to achieve reliable locking element shifting within a compact recess length. By carefully selecting and adjusting these parameters, the design ensures smooth and reliable movement while minimizing the required recess dimension.
Solution Approach 2:
The ramp-shaped guideway is implemented with varying local characteristics - the incline angle and curvature are optimized at different positions along the guideway path. This local quality variation ensures reliable and smooth locking element movement through critical transition zones while keeping the overall guideway length and recess dimension minimized.
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 significantly reduces the force required for locking and unlocking, providing a safe, reliable, and efficient mechanism that supports a smooth movement of the locking element, allowing for easy tool insertion and removal with minimal user effort.
Implementation Method 1
a pressure sleeve (230) which is spring-loaded via an assigned spring element (280)
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
In a hand-held power tool with a tool holder (140) comprising a tubular tool holder (210) in which an insert tool (190) can be locked by an associated locking device (200) via at least one locking element (250), wherein the locking device (200) comprises a pressure sleeve (230) actuated by an associated spring element (280) and a stop sleeve (242), wherein the stop sleeve (242) has a contact surface (244) on its inner circumference (249), and wherein the spring-actuated pressure sleeve (230) acts the at least one locking element (250) against the contact surface (244) in a locking position, the tubular tool holder (210) has at least one recess (216) in which the at least one locking element (250) is arranged at least partially in the locking position, wherein the at least one The recess (216) has a ramp-shaped guide track (300),and wherein the at least one locking element (250) is displaceable along the ramp-shaped guide track (300) from the locking position to an unlocking position.