Patent Application
20050172499
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The present invention relates generally to a gear-drive shear, and more particularly to a gear-drive shear which movable jaw provided with curved plate.
This invention is the improvement based on the prior shear structure, especially the gear-drive shear. The characteristic of this shear structure differs from the general shear in that the movable jaw is not connected with driving grip, but by means of gear wheel module's inter-meshing so as to have an advantage in saving labor and splaying more easily and efficiently.
The defects of the prior structure in practice are as follows:
1. One end of the movable jaw is rotating by means of gear's meshing with the gear wheel module. This structure is lack of flexibility despite the character of toughness because the movable jaw is made of hard steel as a whole. Therefore when trimming sticks, it is easier to cause a troublesome problem of being blocked off no matter when it is closing or opening.
2. One end of the corresponding grip of the movable jaw must be in the gear shape. It must be made of hard steel because the movable jaw should have a function of cropping and cutting. But the cost of material is comparatively high and it is not easy to produce so the integrative gear structure started from the end of jaw will obviously increase costs and it acts against economic benefits.
Therefore, aiming at the problems existing in the prior gear-drive shear, it is a requirement in the industry to improve a more practical and effective new structure.
The benefits of the invention are as follows:
1. It provides a structure of gear-drive shear with an added curved plate on one side of the movable jaw, which is the first invention of the kind in the industry and meets the new-model patent requirement of novelty.
2. Mainly with the added curved plate, the opening and closing of the movable jaw is more flexible and intensive, and therefore result in a supplementary interplay to facilitate the user to use them more practically and effectively with less labor in operation. It meets the new-model patent requirement of advancement.
Also, with the added curved plate, the tooth edge of the movable jaw will be installed on the curved plate and change the previously integrality of the tooth edge. Because the curved plate is suitable to be made of flexible materials, it is easier to process the tooth edge. While the movable jaw which must be made of hard steel can also omit the tooth edge so as to simplify the structure and decrease the processing difficulty. As for the industry, it can therefore reduce production costs and produce better products.
As shown in
One side of the movable jaw 40 is additionally equipped with a curved plate 70. One end of the curved plate 70 is also installed on the first pivot axle 01 of the plate assembly module sharing the same rotating point with the movable jaw 40. Meanwhile it is installed on the first edge 71 of the curved plate 70 together with the first tooth edge 41 of the movable jaw 40 mentioned above. The second edge of the curved plate 70 is equipped with wedge 72, which is locked in the notch 42 on one side of the movable jaw 40. Moreover, the middle section 73 of curved plate 70 is made into a curve, such as in the shape of “<” shown in the annex or in the shape of arc.
The wedge 72 of the curved plate 70 can be made into a round and formed an edge notch 74 so as to set up a round notch cooperated with the notch 42 of the movable jaw 40. One side of the notch 42 is set up to be a flange 43 to mesh with the edge notch 74 mentioned above.
With the structure mentioned above, the opening and closing of the invention, the gear-drive shear is shown in
The features and the advantages of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of a preferred embodiment of the present invention with reference to the accompanying drawings.
