Cutting tools that automatically tighten blades using shearing force

Abstract

This invention discloses a cutting tool that automatically clamps blades together using shearing force. The tool includes a first blade, a second blade, a first screw, and a fixing member. The first blade has a through hole, and the second blade has a threaded hole corresponding to the through hole. The first screw passes through the through hole of the first blade and screws into the threaded hole of the second blade, allowing the first and second blades to open and close relative to each other around the first screw as an axis. The fixing member is disposed on the first blade or a handle and engages with the screw head of the first screw to restrict the rotation of the first screw. Therefore, when the first and second blades perform a cutting action, the threaded hole of the second blade can be axially displaced along the thread of the first screw, causing the second blade to automatically clamp and adhere to the first blade, preventing gaps or separation between the two blades, thus maintaining a tight blade fit and improving cutting efficiency.

Claims

1. A cutting tool that automatically tightens the blade using shearing force, comprising: A first blade, wherein a light hole is provided behind the first blade; A second blade, with a screw hole corresponding to the light hole behind its second blade; a first screw, having a screw rod and a screw head connected to one end of the screw rod, the screw rod passing through the light hole of the first blade and screwed into the screw hole of the second blade, so that the first blade and the second blade can open and close relative to each other with the first screw as the axis; And a fixing member is disposed on the first blade and locked onto the screw head of the first screw to restrict the first screw from rotating relative to the first blade; wherein, when the first blade and the second blade perform a shearing action, the screw hole of the second blade can generate axial displacement along the thread of the first screw, so that the second blade automatically closes and adheres to the first blade.

2. The cutting tool that automatically clamps the blade by shearing force as described in claim 1, wherein the screw head is a polygonal screw head having a plurality of locking surfaces, and the fastener locks onto one or more locking surfaces of the polygonal screw head.

3. The cutting tool that automatically tightens the blade by shearing force as described in claim 2, wherein the fastener is provided with a first polygonal hole that matches the polygonal screw head, the first polygonal hole being fitted onto the polygonal screw head.

4. The cutting tool that automatically clamps the blade by shearing force as described in claim 3, wherein the fixing member has a second screw that passes through the fixing member and locks into the first blade to fix the fixing member.

5. The cutting tool that automatically tightens the blade by shearing force as described in claim 1, wherein a toothed ring is coupled to the outer periphery of the screw head, the toothed ring having a plurality of teeth arranged in a ring, and the fixing member having a locking portion corresponding to the teeth, the locking portion engaging any tooth of the toothed ring to position the angle of the first screw.

6. The cutting tool that automatically clamps the blade by shearing force as described in claim 5, wherein the fixing member has a toothed hole that matches the plurality of teeth, the toothed hole being fitted around the outer periphery of the toothed ring, and the inner wall of the toothed hole engaging with the plurality of teeth.

7. A cutting tool that automatically clamps the blade by shearing force as described in claim 5 or 6, wherein the screw head is a polygonal screw head, and the toothed ring has a second polygonal hole that matches the polygonal screw head, the second polygonal hole being fitted onto the polygonal screw head.

8. The cutting tool that automatically tightens the blade by shearing force as described in claim 1, further comprising a washer and a nut; the washer is disposed on the side of the first blade, the screw of the first screw passes through the washer and the aperture, and is then locked into the screw hole; the nut is screwed onto the screw protruding from the side of the second blade.

9. The cutting tool that automatically clamps the blade by shearing force as described in claim 1, wherein the first blade has a first root at the rear end of the first cutting edge, and the second blade has a second root at the rear end of the second cutting edge; and the first root and the second root are respectively coupled to a handle.

10. The pruning tool that automatically clamps the blade by shearing force as described in claim 9, wherein the first blade, the second blade, and the handle constitute a long-handled pruning shear, a short-handled gardening shear, or a handheld pruning tool.

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