Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having structure to restrict rotation of threaded – mating... – Comprising a thread lock
Patent
1986-07-03
1988-11-01
Smith, Gary L.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having structure to restrict rotation of threaded, mating...
Comprising a thread lock
411324, 411335, 411427, F16B 3922
Patent
active
047815051
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a screw equipped with a locking means, more particularly to a screw equipped with a locking means which not only can prevent the screw from being loosened by, for example, vibration or shock, but also will enable a shortening of the assembly steps by obviating such work as the insertion of a packing or spring washer, or the injection of an adhesive for the prevention of looseness, simultaneously with realizing a saving of the parts to be used.
A conventional screw, as can be seen from the sectional view shown in FIG. 1 (A), has a means for preventing looseness which clamps a member to be fixed, for example, a plate 3, with a bolt 1 and a nut 2 with a packing or spring washer 4 interposed therebetween. Also, as a means of enabling a more complete fixing, an adhesive has been injected at the fitting portion 5 between the bolt 1 and the nut 2 (the sectional view shown in FIG. 1 (B) shows an example of an anchor bolt).
However, according to such a prior art method, a separate material such as a spring washer or adhesive is required and the step of mounting the spring washer 4 or injecting adhesive is required. Further, the adhesive force of the adhesive will be inevitably lowered by change over a period of time. When the screw is to be repeatedly detached, it is impossible to use an adhesive and further, the function of the spring washer 4 will be inevitably degraded, or abrasion will occur after repeated use. Such problems will occur more markedly when the material of the screw consists of different substances.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a screw equipped with a locking means which prevents looseness of the screw as mentioned above and also obviates the use of a spring washer or an adhesive.
More specifically, in accordance with the present invention, there is provided a screw equipped with a locking means, comprising a female thread made of a synthetic resin and a male thread made of a metal, or a female thread made of a synthetic resin and a male thread made of a synthetic resin, fitted with each other, the female thread having a double cylindrical boss portion formed at the center thereof so that the male thread may be fitted into the innerside boss portion and the thread portion of the boss may be deformed more or less and pressed against the shaft of the male thread in the direction perpendicular thereto through the resilience of the synthetic resin, which is the material of the female thread, by pressure on the terminal end of the innerside boss portion from the flange portion of the male thread or a member to be fixed at the final stage of clamping the screw.
EXPLANATION OF THE DRAWINGS
The present invention is described in detail below with reference to the drawings, in which:
FIGS. 1 (A) and (B) are sectional views showing the screw of the prior art, as described above;
FIGS. 2 (A) and (B) and FIGS. 3 (A) and (B) are sectional views showing embodiments of the present invention, in which FIGS. 2 (A) and (B) show the screw constitution of a through-type nut and bolt, and FIGS. 3 (A) and (B) the screw constitution of an anchor-type bolt and nut and FIG. 4A is a partial side elevational view of a bolt having cutting means on the end thereof and FIG. 4B is an end view thereof.
DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION
First, an embodiment 1 of the screw equipped with a locking means according to the present invention is described with reference to FIGS. 2 (A) and (B).
FIG. 2 (A) shows a screw consisting of a male threaded member 1 made of a metal or a synthetic resin (hereinafter called "bolt"), a female threaded member 2 made of a synthetic resin (hereinafter called "nut") fitted therewith, and a member 3 to be fixed.
The nut 2 has a double cylindrical boss portion 7 having a threaded bore 5 at the center, and a groove 6 is provided between the boss portion and the nut body.
FIG. 2 (B) shows details of the nut, the constitution of which is such that the thickness L.sub.2
REFERENCES:
patent: 2201087 (1940-05-01), Hallowell
patent: 2210455 (1940-08-01), Hosking
patent: 2235435 (1941-03-01), Koester
patent: 3001567 (1961-09-01), Brill
patent: 3030997 (1962-04-01), Collins
patent: 3079830 (1963-03-01), Faroni
patent: 3265107 (1966-08-01), Glicksman
patent: 3286754 (1966-11-01), Klooz
patent: 4498826 (1985-02-01), Simmonds
Lindsey Rodney M.
Showa Denko Kabushiki Kaisha
Smith Gary L.
Watanabe Hiroaki
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