Shape of screw and screw part having the same
A technology of threads and parts, applied in the direction of threaded fasteners, screws, nuts, etc., can solve problems such as poor quality and inability to ensure
Active Publication Date: 2007-11-07
株式会社弥满和制作所 +3
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Problems solved by technology
[0013] The object of the present invention is to provide a thread shape and a threaded part having the thread shape. The thread shape of the present invention can be directly used for a thin-plate or thin-walled part whose number of engaging threads equivalent to three metric coarse threads cannot be ensured. , while effectively solving the said problems, is equal to or superior in the strength necessary for fastening the screw thread compared with the case of using the current metric coarse screw thread after performing "repair" or "filling", and in In terms of workability when tightening the thread and difficulty in loosening the thread, it has a function not inferior to the current metric coarse thread
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[0040] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Here, Fig. 1(a), Fig. 1(b) and Fig. 1(c) are an implementation of the threaded parts of the present invention as the first embodiment of the "fine multiple threads" of the thread shape based on the present invention. The plan view, front view, and cross-sectional view of an example machine screw, the machine screw 1 having the "fine multiple threads" of the first embodiment is a cross-recessed machine screw with straight threads (straight screw), and the threaded part 2 There are three threads 2a. In addition, Fig. 1 (d) and Fig. 1 (e) are the cross-sectional views showing the second embodiment and the third embodiment of the "fine multiple thread" based on the thread shape of the present invention, respectively, the second embodiment and The only difference between the third embodiment and the first embodiment is that the number of threads 2a of t...
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The invention provides a shape of a screw for fastening thin-sheets and thin-walled parts characterized in that the value of the ratio (P / D) of the pitch (P) to the nominal diameter (D) of the coarse thread of the screw is reduced less than that of coarse threads conforming to various standards on threads and the number of threads of the screw is set to two or more. Thus, for the thin-sheets and thin-walled parts in which the threaded number of screw threads of three cannot be secured with current metric coarse thread screws, the shape of the screw advantageous in strength and excellent in loose torque after vibration is applied thereto can be provided since screw fastening is stabilized more than a case in which the metric coarse thread screws are used.
Description
technical field [0001] The present invention relates to a threaded part for fastening, especially relates to a thread shape of "fine and dense multi-thread" which is easy to fasten and not easy to loosen for fastening thin plate or thin-walled parts, and a threaded part with this thread shape. Background technique [0002] The so-called "triangular screw thread" is defined in JIS B 0101 "Thread Terms" as "a general term for threads whose shape is close to that of an equilateral triangle. Metric screw thread and unified screw thread" Miniature screw threads and the like belong to the triangular threads.". [0003] In addition, the so-called "coarse thread (coarse thread)" is defined in JIS B 0101 "Thread terms" as "the combination of diameter and pitch has a general and most commonly used triangular thread.". [0004] The following description of the present invention takes the most general "metric thread" in the triangular thread as an example, but the present invention is ...
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IPC IPC(8): F16B33/02F16B35/00
CPCF16B33/02F16B35/00F16B5/02
Inventor 渡边芳男三井雅夫中山文利
Owner 株式会社弥满和制作所