Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Internally threaded fastener element – e.g. – nut – etc. – Multipart
Patent
1995-11-27
1998-09-22
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Internally threaded fastener element, e.g., nut, etc.
Multipart
411 7, 411408, 411919, F16B 2300, F16B 3708
Patent
active
058105336
DESCRIPTION:
BRIEF SUMMARY
DETAILED DESCRIPTION OF THE INVENTION
1. Field of Industrial Use
The present invention relates to a screw for fastening such as an attachment bolt or an attachment nut used to secure a rotational tool, such as the grindstone of a hand grinder or a circular hand saw, for example, to the drive shaft of an electrically powered tool.
2. Prior Art
Conventionally, in order to attach a rotational tool such as the grindstone or circular saw mentioned above to the drive shaft of an electrically powered tool, a flange and bolt are formed on the end of the drive shaft, the rotational tool is impaled on the bolt portion and a nut screwed onto the outside thereof, and the nut is fastened to secure the rotational tool between the said nut and the above-mentioned flange.
However, there are problems in using the above-mentioned rotational tool in that, if the said rotational tool is used in an impacting fashion, the nut becomes tighter than necessary due to the impact and the reaction thereto, so that the nut is too tight when the rotational tool is to be removed and it cannot be removed even if a wrench is used.
Additionally, the above-mentioned operations of fastening and loosening the nut have problems in that normal practice is to employ a force-enhancing tool such as a wrench, but the force with which the nut is fastened or loosened is amplified only by the force-enhancing tool and adequate amplification can therefore not be achieved.
PROBLEMS TO BE SOLVED BY THE INVENTION
The present invention aims to provide a screw for fastening whereby the screw member can be readily removed by preventing the screw member from becoming too tight due to the rotational force caused by reaction to use of the rotational tool in an impacting fashion.
Additionally, it aims to provide a screw for fastening which gives a substantial fastening force and a strong loosening force for a minor rotational input, and which can be strongly fastened and loosened by turning it in a direct manual rotating operation without using a power-enhancing tool.
Again, it aims to provide a screw for fastening which can be compactly constructed and has good operating properties.
MEANS OF RESOLVING THE PROBLEMS
The invention disclosed in claim 1 of the invention is characterised in that it is a screw for fastening which is provided with a screw member with a female screw or a male screw formed in its core area; a flange ring which is fitted around the outer circumferential area of one edge of said screw member with freedom to turn relative to said screw member, and the outside surface of which makes contact with the object to be attached; an operating ring which is fitted around the outer circumferential area at the other edge of the above-mentioned screw member with freedom to turn relative to said screw member, which operating ring faces the above-mentioned flange ring, separated from it by a prescribed separation, and which inputs the operational rotational force; a screw feed ring which is positioned in the interval between the above-mentioned flange ring and the above-mentioned operating ring, which is held off-center by having part of its female screw area, which is provided on the relevant inner circumferential portion, mesh with the male screw area provided on the outer circumferential area of the screw member in the said positioning interval, and which transmits screw feed caused by revolution to the above-mentioned flange ring in the thrust direction; and a holding ring fitted around the outer circumferential area of the above-mentioned screw feed ring, which permits revolution of the said screw feed ring by holding the said screw feed ring off-center.
The invention claimed in claim 2 of the invention is characterised in that it is a screw for fastening which, in addition to having the configuration of the invention claimed in claim 1 mentioned above, is a screw for fastening in which a reverse screw ring regulated to a predetermined screw feed amount is screwed onto the outer circumference of the above-mentioned screw member; the outer circum
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Power Tool Holders Incorporated
Wilson Neill R.
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