Support Shears With Blade Recess for Sealing Tape Overhang
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Solution Overview
Problem
Sealing problems often arise at the end or joint area of plaster strips due to temperature fluctuations causing the sealing tape to shrink, leading to a loss of sealing function, and manual creation of a sealing tape projection is difficult and risky.
Innovation Solution
A support scissor design with a blade body and counterpart, featuring two-blade or three-blade variants, where the blades are arranged to automatically create a defined sealing tape projection when cutting through the plaster strip, ensuring the sealing tape protrudes beyond the end edge, reducing waste and risk of injury.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual methods are used to create a sealing tape projection, then flexibility and adaptability are maintained, but the risk of injury increases and the process is difficult and unreliable
Solution Approach 1:
The cutting device performs the function of creating the sealing tape projection automatically during the cutting process. The blade geometry with recess is designed to self-generate the projection without requiring separate manual operations, making the system self-sufficient and eliminating the need for risky manual intervention.
Solution Approach 2:
The blade is pre-designed with a recess that automatically creates the sealing tape projection during the cutting operation. This preliminary design of the blade geometry ensures that the projection is formed as part of the cutting process itself, rather than requiring subsequent manual manipulation.
2Manufacturing precision
If manual methods are used to create a sealing tape projection, then no additional device complexity is introduced, but the manufacturing precision and reproducibility deteriorate
Solution Approach 1:
The blade is designed with a specific local feature - a recess at a predetermined position and with predetermined dimensions. This local modification of the blade geometry creates the sealing tape projection with precise dimensions while keeping the rest of the blade structure simple and straightforward.
3Productivity
If the sealing tape is cut along with the plaster strip, then the cutting process is simple and fast, but the sealing function is lost due to tape shrinkage
Solution Approach 1:
The cutting process is segmented into two distinct cutting actions: first cutting the plaster strip and secondly cutting the sealing tape separately. This segmentation allows the plaster to be cut quickly while the sealing tape is subsequently cut to create the projection, ensuring both productivity and sealing reliability.
Solution Approach 2:
The sealing tape projection is created as a preliminary action before the final cutting of the sealing tape. By first creating the projection and then making the final cut, the system ensures that the sealing tape maintains its sealing function while still achieving the desired projection.
Data Source
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AI summary
The present invention relates to a support shear (2) for cutting a plastering strip (26) and for automatically creating a sealing tape overhang (d), comprising: a blade body (4) designed to cut the plastering strip (26); and a counterpart (6) having a support surface (14) for placing a plastering strip (26) with sealing tape (28) to be cut onto it, and limiting the movement of the blade body (4), wherein the blade body (4) has two spaced-apart blades (8, 10), one of the blades (10) having a recess (12) designed to produce a defined sealing tape overhang (d); or wherein the blade body (4) has three defective blades, wherein the two outer blades (34, 36) each have a recess (44) designed to produce a defined sealing tape overhang (d), and wherein the middle blade (38) is designed without recesses.Furthermore, the invention also relates to an arrangement comprising a support shear (2) according to the invention and a plastering strip (26) with a sealing strip (28) placed on the support surface (14) of the counterpart (6). The invention also relates to a method for cutting a plastering strip (26) and for producing a defined sealing strip projection (d) of a sealing strip (28).