Knife protection device used in cutting device

[0001] The present invention relates to knife protection devices, and in particular to a knife protection device used in a cutting device, wherein when a cutting device is used to cut an object, the present invention has the advantage of preventing the knife edges of the cutting device from being destroyed so as to have a longer lifetime.

[0002] In the prior art cutting device, protecting covers are used to enclose the knife portions so as to prevent the knife edges to be destroyed. However generally, the damage of the knife portions of a cutting means is due to the use of the cutting means (at this moment, the cover is taken out from the cutting device and thus no protection function is presented).

[0003] In use of a cutting means, if a great force is applied to the device, the knife portions will suffer the great force so as to wear or be damaged. However this will reduce the lifetime of the cutting device.

[0004] This is because in cutting, the two knife edges of the cutting device will resist against an object to be cut so that the great force will apply to the contact surfaces of the two knife edges. However for a longer time the contact surfaces will wear. Furthermore, this will induce the knife edges to shift from one another so that they can not be aligned in cutting. However this will induce that the object to be cut cannot be cut effectively.

[0005] Accordingly, the primary object of the present invention is to provide a knife protection device used in a cutting device, wherein when a cutting device is used to cut an object, the present invention has the advantage of preventing the knife edges of the cutting device to be destroyed so as to have a longer life time.

[0006] To achieve above object, the present invention provides a knife protection device used in a cutting device. The cutting device has a tool body; the tool body having a cutting section and a handle; the cutting section having at least one cutting portion. The knife protection device comprises a protection unit installed on the cutting section. The protection unit is a protection cover; and the protection cover is installed with a retaining portion and a knife protection portion. The tool body has a screwing portion; the screwing portion and the retaining portion have respective screw holes for retaining the protection unit to the tool body. The cutting portion has two knife edges; a clamping space is formed between one of the two knife edges and the knife protection portion; and another knife is capable of being receiving in the clamping space.

[0007] Furthermore, the present invention provide a knife protection device used in a cutting device; the cutting device being a pliers; a retaining portion being installed below a pivotal portion of the pliers; a protection unit being secured to be near a first knife edge for preventing the first knife edge to resist against a second knife edge. The protection unit is a protection cover; and the protection cover is installed with a retaining portion; a body of the pliers has a screwing portion; the screwing portion and the retaining portion have respective screw holes for retaining the protection unit to the body.

[0008] The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing.

[0019] In order that those skilled in the art can further understand the present invention, a description will be described in the following in details. However, these descriptions and the appended drawings are only used to cause those skilled in the art to understand the objects, features, and characteristics of the present invention, but not to be used to confine the scope and spirit of the present invention defined in the appended claims.

[0020] With reference to FIG. 1, the present invention includes the following elements.

[0021] A tool body 1 has a handle 10 and a cutting section 20.

[0022] The cutting section 20 has at least one cutting portion and a protection unit 30. In this embodiment, the cutting section 20 has a first cutting portion 21, a second cutting portion 22 above the first cutting portion 21 and a third cutting portion 23 above the second cutting portion 22. Each of the first cutting portion 21, second cutting portion 22 and third cutting portion 23 has two knife edges. The first, second and third cutting portion are spaced apart and the second and third cutting portions 22, 23 are spaced by a pivotal portion 15. The first cutting portion 21 has a first knife edge 211 and a second knife edge 212.

[0023] The protection unit 30 is installed to a portion of the cutting section 20 near the first knife edge 211. The cutting section 20 has a screwing portion 24. The screwing portion 24 has a plurality of first screw holes 241 for retaining the protection unit 30. The protection unit 30 is a protection cover 31 which is formed by a retaining portion 311 and a knife protection portion 312. The handle 10 has a left leg 12 and a right leg 11. When the right leg 11 and left leg 12 move closely, the knife protection portion 312 will contact an inner side of one of the two legs 11, 12. The retaining portion 311 has a plurality of second screw holes so as to fix the retaining portion 311 to the screw holes 241.

[0024] Referring to FIG. 2, after assembly, a clamping space 40 is a gap formed between the first cutting portion 21 and the knife protection portion 312. In cutting, the clamp space 40 serves for receiving the second knife edge 212 so as to have the function of the protection.

[0025] Referring to FIGS. 3 and 4, in use of the present invention, initially, when the second knife edge 212 is in contact with the first knife edge 211, the second knife edge 212 is in a protection range of the first knife edge 211 and in the clamping space 40. Then the larger the contact surface with the knife protection portion 312, the greater the protection space. Thereby it is difficult to expand the cutting section 20.

[0026] When a great force is applied to the cutting section 20, the first knife edge 211 is more closer to the second knife edge 212. As a result the contact area between the second knife edge 212 and the knife protection portion 312 are greater so that the stress force is dispersed to be more uniformly distributed on the cutting section 20. Thereby the cutting section 20 is protected from destroy in cutting operation.

[0027] Referring to FIGS. 5 and 6, applications of the present invention is illustrated. It is illustrated that the present invention can be used to a tool body 1 for cutting a steel cable, a steel plate, or a steel rope. The tool body 1 has a longer handle 10 so as to suffer from a greater force. However in use, these tools suffer from greater forces and thus it is eager to have the protection unit of the present invention to protect the cutting section so as to have a longer lifetime.

[0028] With reference to FIG. 7, one side of the second knife edge 212 has a further protection unit 30 same as that in the first knife edge 211 so as to have the function of dual protections.

[0029] Referring to FIGS. 8 to 10, the present invention can be used to pliers 5. The pliers have a resisting portion 50 below a pivotal portion. In operation, when the two knife edges of the pliers are move to an extreme position, the two knife edges will contact with one another. The protection unit 51 is installed at one side of the resisting portion 50 so as to prevent the two edges to move more closer to deform.

[0030] The present invention is thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.