Four-Sided Shimable Shear Tip Boot for Demolition Shears
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Solution Overview
Problem
Demolition shears face issues with wear and alignment problems in the shear tang area, leading to reduced clamping force and premature wear, which results in costly maintenance and downtime due to the need for frequent replacement of worn parts.
Innovation Solution
A one-piece, four-sided hardened steel boot tip with shims and an extendable boss for the upper jaw tang of demolition shears, providing complete protection and adjustable clamping force to prevent wear and ensure proper alignment, thereby extending the life of the shear tip and reducing maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a traditional shear tip or tang is used without protection, then the structure remains simple and easy to manufacture, but the shear tip becomes worn prematurely and requires frequent replacement
Solution Approach 1:
The shear tip is divided into multiple replaceable segments or sections. When one segment becomes worn, only that specific segment needs to be replaced rather than the entire shear tip assembly, thereby extending the overall service life while maintaining a relatively simple structure.
Solution Approach 2:
The shear tip design includes pre-positioned wear surfaces and protective features that are engineered to wear in a controlled manner before critical components are affected. This preliminary wearing action protects the main structural elements and extends the functional life of the shear tip.
2Ease of manufacture
If the shear tip structure is simplified for ease of manufacture, then manufacturing costs are reduced, but alignment problems and wear in the shear tang area increase
Solution Approach 1:
The shear tip incorporates adjustable elements that allow for dynamic alignment adjustments during operation or maintenance. This enables the simple manufactured structure to achieve and maintain proper alignment, resolving the contradiction between manufacturing simplicity and alignment reliability.
Solution Approach 2:
An intermediary alignment feature or mechanism is introduced between the shear tip and the tang connection. This intermediary element facilitates easy alignment during manufacturing while maintaining reliable alignment during operation, bridging the gap between manufacturing simplicity and operational reliability.
3Force
If the shear tip is designed without adjustable clamping force, then the structure remains simple, but clamping force decreases due to wear leading to premature failure
Solution Approach 1:
The clamping mechanism includes adjustable elements that allow the clamping force to be modified as wear occurs. This dynamic adjustment capability maintains optimal clamping force throughout the service life of the shear tip without requiring a complex over-engineered initial design.
Solution Approach 2:
The design allows for parameter changes in the clamping force through simple adjustment mechanisms. As wear progresses, the clamping parameters can be modified to compensate for material loss, maintaining effective clamping force without requiring a fundamentally complex mechanism.
4Reliability
If frequent replacement of worn parts is performed, then the shear tip reliability is maintained, but downtime and maintenance costs increase
Solution Approach 1:
By segmenting the shear tip into replaceable sections, maintenance can be performed more quickly by replacing only the worn segment rather than the entire assembly. This reduces downtime while maintaining reliability through timely replacement of worn components.
Solution Approach 2:
The design includes pre-configured replacement features and wear indicators that allow for planned maintenance before critical failure occurs. This preliminary preparation reduces unexpected downtime and allows for more efficient maintenance scheduling.
Data Source
AI summary
A one piece four-sided hardened steel boot tip is mounted to a distal end upper jaw tang of a heavy duty demolition. The boot tip has a front wall seated on the tang front edge and a right side wall seated on the shear side tang face and radiused or curved rear seat. A top wall has a radiused inside top wall that sits on the radiused tang top seat. A bottom wall of the boot tip has a radiused inside top wall that is seated on the tang radiused bottom seat forming a shear punching edge between the front wall and the bottom wall. The boot tip has a shear side shearing edge that is between the sidewall and the bottom wall of the boot tip. An access or side plate is seated on the guide side tang face, a portion of the radiused boot bottom wall and the radiused rear seat. The side plate is flush with the bottom and front walls. The boot tip right side and access plate have matching apertures therethrough and alignable with the tang apertures to secure the boot and access plate to the tang for encapsulating protection thereof from the lower jaw shear side, the guide side and the tie plate as the upper jaw moves into and out of the recess therebetween. One or more shims may be provided that are insertable inside the boot against the tang faces and clampable thereto after the faces have become worn or otherwise requires adjustment for maximum clamping force.