Patent Application
20090142155
1. Field of the Invention
The present invention relates to an anti-loosening unit, particularly to an anti-loosening unit having cuneal structures and protrusions.
2. Description of the Related Art
Thus, the friction between the cuneal structures 12 and the cuneal structures 141 or the cuneal structures 12′ and the cuneal structures 151 is smaller than that between the waved structures 13 and the workpiece 16 and that between the waved structures 13′ and the workpiece 16, so the cuneal structures 12, the bolt 14 and the nut 15 can slide easily to cause an axial displacement, thereby producing an axial stress. The axial stress will increase the friction between the waved structures 13 and the workpiece 16 and the friction between the waved structures 13′ and the workpiece 16, resulting in an anti-loosening effect of the conventional anti-loosening elements 1 and 1′.
However, since the waved structures 13 and 13′ have waved surfaces, the friction between the waved structures 13 and the workpiece 16 and the friction between the waved structures 13′ and the workpiece 16 cannot completely prevent the waved structures 13, 13′ and the workpiece 16 from sliding and rotating. Therefore, the conventional anti-loosening element 1 and 1′ cannot strongly engage the workpiece 16; in other words, the first conventional anti-loosening element 1 and the second conventional anti-loosening element 1′ have a poor anti-loosening effect.
Consequently, there is an existing need for providing an anti-loosening unit to solve the above-mentioned problem.
The present invention is directed to an anti-loosening unit which comprises at least one ringed plate, said ringed plate comprising an opening, a plurality of slots, a plurality of cuneal structures and a plurality of protrusions. The opening is formed in the central portion of the ringed plate. The slots are formed radially on a first surface of the ringed plate and around the opening, wherein the slots extend from the opening to the outer edge of the ringed plate. The cuneal structures are formed between the slots, and each cuneal structure has a contact surface. The contact surface is an inclined surface between two adjacent slots. The protrusions are formed on a second surface of the ringed plate, wherein the second surface corresponds to the first surface, and the protrusions are formed radially on the second surface.
In the present invention, the ringed plate can be combined with other corresponding elements, for example, cuneal structures of a bolt or cuneal structures of a nut. The friction between the cuneal structures and the cuneal structures of the other corresponding elements is smaller than that between the protrusions and an element surface, and the slots serve to reduce the contact area of corresponding cuneal structures. Therefore, there is a small dragging force between the ringed plate and the other corresponding elements, so the ringed plate can slide easily along the contact surfaces of the cuneal structures to cause an axial displacement, thereby producing an axial stress. The axial stress will increase the friction between the protrusions and the element surface, so the protrusions can further lodge into the element surface. Thus, the anti-loosening unit is not easily rotated and the anti-loosening effect is achieved. Furthermore, since the ringed plate has slots, deformation of the ringed plate can be reduced, and the production quality is improved.
In this embodiment, the slots 22 are formed radially on a first surface of the ringed plate 20 and around the opening 21, wherein the slots 22 extend from the opening 21 to the outer edge of the ringed plate 20 and are spaced at an equal angle. It should be noted that, in this embodiment, the slots 22 are rectangular slots. In other applications, the slots 22 may be curve slots. Preferably, the ringed plate 20 comprises six to thirty-six slots. In this embodiment, the ringed plate 20 has six slots, but the number is not limited to six. In other applications, the ringed plate 20 may have eight, twelve, twenty-four or thirty-six slots. The cuneal structures 23 are formed between the slots 22. Each cuneal structure 23 has a contact surface 231, wherein the contact surface 231 is preferably an inclined surface between two adjacent slots 22.
The protrusions 24 are formed on a second surface of the ringed plate 20, wherein the second surface corresponds to the first surface. The protrusions 24 are formed radially on the second surface. In this embodiment, the protrusions 24 are formed around the opening 21, and the protrusions 24 are preferably ridge structures. Also, the protrusions 24 and the cuneal structures 23 are of equal number, and the protrusions 24 correspond to the cuneal structures 23. In other applications, there may be more protrusions 24 than cuneal structures 23.
The bolt 31 has a head portion 311 and a rod portion 312, wherein the head portion 311 has a plurality of cuneal structures 313, and each cuneal structure 313 of the head portion 311 has a contact surface 314. The contact surfaces 314 of cuneal structures 313 of the head portion 311 match the cuneal structures 301 of the ringed plate 30, and the rod portion 312 penetrates the opening of the ringed plate 30.
The anti-loosening unit 3 of the second embodiment can be combined with a workpiece (not shown), wherein the protrusions 302 of the ringed plate 30 contact the workpiece. Thus, the friction between the cuneal structure 313 of the head portion 311 and the cuneal structures 301 of the ringed plate 30 is smaller than that between the protrusions 302 of the ringed plate 30 and the workpiece, so the ringed plate 30 and the bolt 31 can slide easily to cause an axial displacement to produce an axial stress. The axial stress will increase the friction between the protrusions 302 of the ringed plate 30 and the workpiece. Thus, the anti-loosening unit 3 is not easily rotated and the anti-loosening effect is achieved.
In this embodiment, the nut 41 has an opening 411 and a plurality of cuneal structures 412 formed around the opening 411 of the nut 41, each cuneal structure 412 of the nut 41 has a contact surface 413, and the contact surfaces 413 of cuneal structures 412 of the nut 41 contact the cuneal structures 401 of the ringed plate 40.
The anti-loosening unit 4 of the third embodiment can be combined with a workpiece (not shown), wherein the protrusions 402 of the ringed plate 40 contact the workpiece. Thus, the friction between the cuneal structure 412 of the nut 41 and the cuneal structures 401 of the ringed plate 40 is smaller than that between the protrusions 402 of the ringed plate 40 and the workpiece, so the ringed plate 40 and the nut 41 can slide easily to cause an axial displacement to produce an axial stress. The axial stress will increase the friction between the protrusions 402 of the ringed plate 40 and the workpiece increase. Thus, the anti-loosening unit 4 is not easily rotated and the anti-loosening effect is achieved.
It should be noted that an adhesive material 53 is preferably disposed between the apertures 52 so as to slightly connect the ringed plates 50, 51. Thus, the anti-loosening unit 5 with the two ringed plates 50, 51 can be easily applied to an element which matches the anti-loosening unit 5. Also, the ringed plates 50, 51 have a small combination force therebetween, so the corresponding contact surfaces 501, 511 of cuneal structures 502, 512 of the ringed plates 50, 51 can slide easily to cause an axial displacement to produce an axial stress when the anti-loosening unit 5 is combined with other corresponding elements and the protrusions 504 of the ringed plate 50 or the protrusions 514 of the ringed plate 51 contact the other corresponding elements.
In this embodiment, the ringed plates 80, 81, 82 include a first ringed plate 80, a second ringed plate 81 and third ringed plate 82. The bolt 83 has a head portion 831 and a rod portion 832, wherein the head portion 831 has a flat surface 833, and the rod portion 832 penetrates the openings of the first ringed plate 80 and the second ringed plate 81. The contact surfaces 801 of the first ringed plate 80 and the contact surfaces 811 of the second ringed plate 81 contact each other and the protrusions 802 of the first ringed plate 80 contact the flat surface 833 of the head portion 831.
The nut 84 has an opening 841 and a plurality of cuneal structures 842 formed around the opening 841 of the nut 84, wherein each cuneal structure 842 of the nut 84 has a contact surface 843, the contact surfaces 843 of the nut 84 match the contact surfaces 821 of the third ringed plate 82. The rod portion 832 further penetrates an opening 851 of a workpiece 85, the third ringed plate 82 and the opening 841 of the nut 84, and the workpiece 85 is fixed between the second ringed plate 81 and the third ringed plate 82. The protrusions 811 of the second ringed plate 81 and the protrusions 822 of the third ringed plate 82 contact the workpiece 85.
In the above-mentioned embodiments of the present invention, the friction between the cuneal structures and the cuneal structures of the other corresponding elements, for example, cuneal structures of a bolt or cuneal structures of a nut, is smaller than that between the protrusions and an element surface, for example, a flat surface of a bolt, a flat surface of a nut or a workpiece surface, and the slots serve to reduce the contact area of corresponding cuneal structures. Therefore, there is a small dragging force between the ringed plate and the other corresponding elements, so that the ringed plate slides easily along the contact surfaces of the cuneal structures to cause an axial displacement, thereby producing an axial stress. The axial stress will increase the friction between the protrusions and the element surface, so the protrusions can further lodge into the element surface. Thus, the anti-loosening unit is not easily rotated and the anti-loosening effect is achieved. Furthermore, since the ringed plate has slots, deformation of the ringed plate can be reduced, and the production quality is improved.
While the embodiments of the present invention have been illustrated and described, various modifications and improvements can be made by those skilled in the art. The embodiments of the present invention are therefore described in an illustrative but not restrictive sense. It is intended that the present invention may not be limited to the particular forms as illustrated, and that all modifications that maintain the spirit and scope of the present invention are within the scope as defined in the appended claims.
