Patent Application
20190022881
The disclosure relates to a cutter, and more particularly to a scissor-type cutter.
A scissor cutter, for example, a gardening cutter, disclosed in Taiwanese Patent No. D110500, or M503083, includes two overlapped cutting members pivotally connect to each other. Generally, the cutting members are prone to wear at their cutting edges and loosen at their pivot point after a period of frequent use. As a result, the scissoring action of the scissor cutter may become ineffective.
Therefore, an object of the disclosure is to provide a scissor cutter that is capable of balancing abutment pressure about a pivot so as to prevent the pivot from loosening and subjecting to excessive abutment pressure.
According to the disclosure, a scissor cutter includes a first cutting member, a second cutting member, and a pivot.
The first cutting member includes a first pivot portion, two first offset portions, a first cutting portion, and a first handle portion. The first pivot portion is pivotal about a pivot axis of the scissor cutter. The first offset portions are respectively connected to two opposite sides of the first pivot portion, which are opposite from each other along a lengthwise direction of the scissor cutter perpendicular to the pivot axis. The first cutting portion is connected to and extends away from the first pivot portion and one of the first offset portions along the lengthwise direction, and has a first contact face. The first handle portion is connected to the first pivot portion and another one of the first offset portions, and extends oppositely of the first cutting portion.
The second cutting member includes a second pivot portion, two second offset portions, a second cutting portion, and a second handle portion. The second pivot portion is pivotally connected to the first pivot portion. The second offset portions are respectively connected to two opposite sides of the second pivot portion, which are opposite from each other along the lengthwise direction. The second cutting portion is connected to and extends away from the second pivot portion and one of the second offset portions along the lengthwise direction, and has a second contact face. The second handle portion is connected to the second pivot portion and another one of the second offset portions, and extends oppositely of the second cutting portion.
The pivot extends through and interconnects the first and second pivot portions.
The first and second contact faces contact each other along a shear plane. The second pivot portion, the first cutting portion and the first offset portions are located at a first side of the shear plane. The first pivot portion, the second cutting portion and the second offset portions are located on a second side of the shear plane. When the first and second pivot portions pivotally move with respect to each other to perform a scissoring action, the first offset portions respectively abut against the second offset portions.
Other features and advantages of the disclosure will become apparent in the following detailed description of the embodiments with reference to the accompanying drawings, of which:
Before the disclosure is described in greater detail, it should be noted that where considered appropriate, reference numerals or terminal portions of reference numerals have been repeated among the figures to indicate corresponding or analogous elements, which may optionally have similar characteristics.
As illustrated in
The first cutting member 10 includes a first pivot portion 11, two first offset portions 12, 12′, a first cutting portion 13, and a first handle portion 14. The first pivot portion 11 is pivotal about a pivot axis (L) of the scissor cutter. The first offset portions 12, 12′ are respectively connected to two opposite sides of the first pivot portion 11, which are opposite to each other with respect to the pivot axis (L) and along a lengthwise direction (X) of the scissor cutter perpendicular to the pivot axis (L). The first cutting portion 13 is connected to the first pivot portion 11 and the first offset portion 12 and extends away therefrom along the lengthwise direction (X). The first handle portion 14 is connected to the first pivot portion 11 and another first offset portions 12′, and extends oppositely of the first cutting portion 13. The first pivot portion 11 has a first rotation contact surface 112 transverse to the pivot axis (L), and a first pivot hole 111 extending through the first rotation contact surface 112. Each of the first offset portions 12, 12′ has a first balancing surface 121, 121′. The first balancing surfaces 121, 121′ of the first offset portions 12, 12′ are coplanar with the first rotation contact surface 112. The first cutting portion 13 has a first contact face 131 coplanar with the first balancing surfaces 121, 121′ of the first offset portions 12, 12′, and the first rotation contact surface 112.
The second cutting member 20 includes a second pivot portion 21, two second offset portions 22, 22′, a second cutting portion 23, and a second handle portion 24. The second pivot portion 21 is pivotally connected to the first pivot portion 11. The second offset portions 22, 22′ are respectively connected to two opposite sides of the second pivot portion 21, which are opposite to each other along the lengthwise direction (X). The second cutting portion 23 is connected to the second pivot portion 21 and the second offset portions 22 and extends away therefrom along the lengthwise direction (X). The second handle portion 24 is connected to the second pivot portion 21 and another second offset portion 22′, and extends oppositely of the second cutting portion 23. The second pivot portion 21 has a second rotation contact surface 212 transverse to the pivot axis (L) and contact the first rotation contact surface 112, and a second pivot hole 211 extending through the second rotation contact surface 212. The second offset portions 22, 22′ respectively have second balancing surfaces 221, 221′ in contact with respective first balancing surfaces 121, 121′ of the first offset portions 12, 12′. The second balancing surfaces 221, 221′ of the second offset portions 22, 22′ are coplanar with the second rotation contact surface 212. The second cutting portion 23 has a second contact face 231 coplanar with the second balancing surfaces 221, 221′ of the second offset portions 22, 22′ and is in contact with the first contact face 131.
The pivot 30 extends through the first and second pivotal holes 111, 211 and interconnects the first and second pivot portions 11, 21. In this embodiment, the pivot 30 is a rivet having the pivot axis (L).
Referring back to
As described above, the second pivot portion 21, the first cutting portion 13 and the first offset portions 12, 12′ are located at a first side (S1), and the first offset portions 12, 12′ are opposite to each other with respect to the pivot axis (L) and along the lengthwise direction (X). The first pivotal portion 11, the second cutting portion 23 and the second offset portions 22, 22′ located at the second side (S2), and the second offset portions 22, 22′ are opposite to each other with respect to the pivot axis (L) and along the lengthwise direction (X). During a scissoring operation, the first and second cutting portions 13, 23 engage a work piece (not shown) therebetween, and the first and second pivot portions 11, 21 pivot about the pivot axis (L). The action of scissoring tends to create a displacing force that causes the first and second cutting portions 13, 23 and the first and second pivot portions 11, 21 to displace away from the shear plane (P) along the pivot axis (L). However, because the first offset portions 12, 12′ respectively abut against the second offset portions 22, 22′, the first and second offset portions 12, 12′, 22, 22′ apply a counteracting pressure that causes the first and second pivot portions 11, 21 to move toward the shear plane (P) along the pivot axis (L). The counteracting pressure also causes the first cutting portion 13 and the second cutting portion 23 to move toward each other and toward the shear plane (P). Therefore, the first and second pivot portions 11, 21 and the first and second cutting portions 13, 23 are prevented from displacing away from the shear plane (P). An efficient scissoring action may thus be maintained for a long period of use.
Because the first offset portions 12, 12′ are opposite to each other with respect to the pivot axis (L) at the first side (S1) and are connected to the first pivot portion 11 at the second side (S2), and because the second offset portions 22, 22′ are opposite to each other with respect to the pivot axis (L) at the second side (S2) and are connected to the second pivot portion 21 at the first side (S1), the first and second offset portions 12, 12′, 22, 22′ are able to provide a uniform counteracting pressure to resist displacement of the first and second pivot portions 11, 21 and the first and second cutting portions 13, 23. Since the counteracting pressure is uniform, localized wear of the first and second cutting portions 13, 23 may be avoided.
In addition, the abutment of the first and second offset portions 12, 12′, 22, 22′ at the shear plane (P) can share friction force between the first and second pivot portions 11, 21 and between the first and second cutting portions 13, 23, thereby avoiding excessive friction force and maintaining a balanced shearing or scissoring force. The service life of the scissor cutter of the present disclosure may therefore be prolonged. After a long period of use, the first and second cutting portions 13, 23 are not prone to separation at the first and second contact faces 131, 231 and at their ends.
In this embodiment, each of the first and second handle portions 14, 24 has a short straight configuration. Each of the first and second offset portions 12, 12′, 22, 22′ has, but is not limited to, a semi-circular cross section. The first cutting portion 13 is integrally connected to the first pivot portion 11. The second cutting portion 23 is integrally connected to the second pivotal portion 21. The first and second cutting portions 13, 23 are in the form of a long blade.
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In the description above, for the purposes of explanation, numerous specific details have been set forth in order to provide a thorough understanding of the embodiments. It will be apparent, however, to one skilled in the art, that one or more other embodiments may be practiced without some of these specific details. It should also be appreciated that reference throughout this specification to “one embodiment,” “an embodiment,” an embodiment with an indication of an ordinal number and so forth means that a particular feature, structure, or characteristic may be included in the practice of the disclosure. It should be further appreciated that in the description, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of various inventive aspects.
While the disclosure has been described in connection with what are considered the exemplary embodiments, it is understood that this disclosure is not limited to the disclosed embodiments but is intended to cover various arrangements included within the spirit and scope of the broadest interpretation so as to encompass all such modifications and equivalent arrangements.
