Patent Application
20090113950
1. Field of the Invention
The present invention relates to an improvement on a lock structure, more particularly one, which consists of a lock body, and several saw-resistant pins inserted in a periphery portion of the lock body to prevent the lock body from being damaged with a saw.
2. Brief Description of the Prior Art
A variety of locks are available for helping to prevent thievery, e.g. door locks, combination locks, and cable locks, which are mainly used for locking bicycles and motorcycles. And, the industry have recently developed electromagnetic locks, chip locks, and voice-controlled locks, which are more advanced than conventional locks, and can't be easily open by unauthorized persons. Moreover, stronger locks are also available, which are made of saw-resistant materials so as not to be damaged with saws.
Shown in
However, it takes relatively much cost, labor and time to manufacture the lock 8 because all of the metallic plates 81 have to be subjected to heat treatment, and then stacked and fastened together by means of rivets.
It is a main object of the present invention to provide an improvement on a lock structure, which has relatively good saw-resistant capability, and takes relatively little cost, labor and time to manufacture, to overcome the above problems.
A lock according to an embodiment of the present invention includes a lock body, which has a core holding hole in a middle portion, and a lock core fitted in the core holding hole. The lock body has several pin holes on a periphery portion thereof, and saw-resistant pins are inserted in the pin holes of the lock body respectively; the saw-resistant pins have already undergone heat treatment to have high strength therefore they will protect the lock body from being damaged with saws.
The present invention will be better understood by referring to the accompanying drawings, wherein:
Referring to
The lock body 1 is made of hard plastics, and has several pin holes 11 spaced apart on a periphery thereof. The saw-resistant pins 3 have already undergone heat treatment to increase in strength, and are inserted in the pin holes 11 of the lock body 1 respectively to prevent the lock body 1 from being cut with a saw; because the saw-resistant pins 3 have already undergone heat treatment, they are stronger than common saws; the pin holes 11 have a smaller diameter than the saw-resistant pins 3 therefore the saw-resistant pins 3 are tight in the pin holes 11. The lock body 1 further has several fixing holes 12 next to the pin holes 11, a core holding hole 13 in a middle, and lock holes 14 on two sides of the core receiving hole 13. And, the lock body 1 is equipped with a lock core 6, which is held in the core holding hole 13 thereof.
A cable 7 is securely joined to a first one of the lock holes 14 of the lock body 1 at a first end, and can be passed at a second end thereof into the other (second) lock hole 14 to be fastened to the lock body 1 by means of the lock core 6; the second end of the cable 7 can be separated from the lock hole 14 after the lock core 6 is moved to an unlocking position.
The cable 7 is taught in a patent application, “SAW AND SCISSOR RESISTANT STRUCTURE OF A CABLE LOCK”, by the inventor of the present invention, which cable lock includes a lock body, and a cable component; the lock body has a fixing hole, and a detainment hole on a top; the cable component is inserted in and securely joined to the fixing hole of the lock body at a first end, and it can be passed at a second end thereof into the detainment hole to be fastened to the lock body; the lock body can be moved to an unlocking configuration by means of a key, thus allowing the second end of the cable component to separate from the detainment hole. The cable component includes a flexible cable, and several metallic rings positioned around the flexible cable. The metallic rings can be made of extra-strong and steel materials or metallic materials having already undergone a special strengthening treatment. A first end of each metallic ring has a smaller outer diameter than a second end of the metallic ring; the smaller first end of the metallic ring is substantially cone-shaped, becoming gradually narrower towards a free end thereof, and the free end has a spherical surface. The larger second end of each metallic ring is substantially bell-shaped, becoming gradually wider towards a free end thereof; the metallic rings are positioned close together such that the spherical surface and the conical portion of the smaller first end of one said metallic ring is received in the bell-shaped second end of an adjacent metallic ring. Thus, the cable component can't be damaged with saws or scissors.
The upper and the lower covering plates 2 each have several fixing holes 21 thereon. The upper covering plate 2 further has two through holes 22 to face the lock holes 14 of the lock body 1. The upper and the lower covering plates 2 are positioned on a top and a bottom of the lock body 1 respectively, with the fixing holes 21 thereof facing corresponding said fixing holes 12 of the lock body 1.
The fixing pins 4 have already undergone heat treatment, and are inserted in the fixing holes 21 of the lower covering plate 2, the fixing holes 12 of the lock body 1, and the fixing holes 21 of the upper covering plate 2 so as to fasten the lock body 1 and the upper and the lower covering plates 2 together. Each of the fixing pins 4 has a stopping bottom portion 41 with a truncated-cone shape, and a riveting hole 42 on the upper end; the upper ends of the fixing pins 4 are pressed/hammered to open so as to be firmly fixed in position; the stopping bottom portions 41 of the fixing pins 4 are stopped from moving into the fixing holes 21 of the lower covering plate 2, thus being pressed against the bottom side of the lower covering plate 2. Furthermore, the fixing holes 12 of the lock body 1 have a smaller diameter than the fixing pins 4.
The shell 5 has a receiving hole 51 as shown in
In assembly, first the saw-resistant pins 3 are inserted in the pin holes 11 of the lock body 1 to prevent the lock body 1 from being sawn. Next, the lock core 6 is positioned in the core holding hole 13. The upper and the lower covering plates 2 are positioned on the top and the bottom of the lock body 1, and the fixing pins 4 are inserted in the fixing holes 21 and 12 with the stopping bottom portions 41 being pressed against the bottom of the lower covering plate 2, and with the upper ends sticking out from the upper covering plate 2. Then, the upper ends of the fixing pins 4, on which the riveting holes 42 are formed, are subjected to pressure to open so as to fasten the lock body 1 and the covering plates 2 together, as shown in
In use, the cable 7 is passed through an object, and next the second end of the cable 7 is passed into the second lock hole 14 of the lock body 1, and fastened with the lock core 6, as shown in
From the above description, it can be seen that the present invention has the following advantages:
1. The lock body of the present invention is protected against sawing by means of the saw-resistant pins, which are inserted in the periphery portion, and have already undergone heat treatment. Therefore, while having the same saw-resistant capability, the present lock body has relatively low manufacturing cost as compared with the prior art, which comprises several stacked metallic plates having already undergone heat treatment.
2. The present lock body is protected against sawing by means of the saw-resistant pins, which are inserted in the periphery portion, and have already undergone heat treatment. Therefore, while having the same saw-resistant capability, the present lock body takes less labor and time to assemble than the prior art, which comprises several stacked metallic plates having already undergone heat treatment.
3. The fixing pins also can be subjected to heat treatment to help increase the saw-resistant capability of the lock body before they are used to fasten the lock body and the covering plates together.
4. The cable of the present invention can be subjected to special strengthening treatment to have saw-resistant capability so that the whole lock can prevent thievery effectively.
