Shank Chisel with Axial Tool Access
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Solution Overview
Problem
Existing shank chisels are labor-intensive and unsafe to install and remove, especially in cramped conditions, due to the need for axial force to overcome clamping sleeve friction, which complicates replacement and maintenance.
Innovation Solution
A shank chisel design featuring a shank extension with a tool fitting accessible through a gap region, allowing for guided insertion and removal of an actuating element through the receiving bore, facilitated by a circumferential groove and chamfered surfaces for secure engagement and easy access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clamping sleeve is used to secure the shank chisel in the chisel receptacle, then the chisel is firmly held in place during operation, but the chisel becomes difficult and dangerous to remove due to high friction forces requiring axial force to overcome
Solution Approach 1:
The shank extension is segmented into functional zones: a clamping zone with larger diameter that engages the clamping sleeve, and a removal zone with smaller diameter that allows tool access. This segmentation allows the same structure to provide both strong holding force during operation and easy removal when needed.
Solution Approach 2:
The shank extension acts as an intermediary element between the chisel shank and the removal tool. It provides a gap region through which a removal tool can pass axially to engage the tool fitting, mediating between the clamped chisel and the external removal force without requiring direct access to the chisel end.
2Reliability
If the chisel shank is fully clamped by the clamping sleeve, then secure holding is achieved, but access for tool insertion becomes blocked
Solution Approach 1:
The shank extension exhibits local quality variation along its length: the first section has a larger diameter for secure clamping engagement, while the second section has a smaller diameter creating a gap region for tool access. This local differentiation allows both clamping security and tool accessibility to coexist in the same component.
3Ease of operation
If a traditional pushing section tool is used to remove the chisel, then the clamping force can be overcome, but the process becomes labor-intensive and unsafe in cramped conditions
Solution Approach 1:
The invention replaces the complex articulated pushing section mechanism with a simpler axial insertion tool. Instead of requiring swiveling handles and leverage forces, the new tool fits directly into the tool fitting and removes the chisel through simple axial motion, substituting a complex mechanical system with a simpler one that is faster and safer to operate.
Data Source
AI summary
A shank chisel including a chisel head and a chisel shank, wherein the chisel shank bears a clamping sleeve in which the chisel shank is held captively in a direction of a longitudinal axis and is freely rotatably about the longitudinal axis. To allow the shank chisel to be both assembled and disassembled through a chisel receptacle of a chisel holder that is formed as a receiving bore, according to this invention, the chisel shank bears at its end remote from the chisel head a shank extension, the shank extension has a tool receptacle, and the tool receptacle is accessible by way of a spacing region of the shank extension in the axial direction of the chisel that is set back from the lateral surface of the chisel shank and/or from the lateral surface of the clamping sleeve.