Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Internally threaded fastener element – e.g. – nut – etc. – Multipart
Patent
1997-06-10
1999-02-16
Wilson, Neill
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Internally threaded fastener element, e.g., nut, etc.
Multipart
411408, 411428, 411917, F16B 3506, F16B 3708
Patent
active
058713220
DESCRIPTION:
BRIEF SUMMARY
DETAILED DESCRIPTION
1. Field of Industrial Use
This invention is used as a clamp screw (for example a nut) for clamping a rotating tool such as, for example, the grindstone of a hand-grinder, or a circular hand-saw, to a threaded attachment part (for example a male thread) provided on the drive shaft of an electric tool.
2. Prior Art
When attaching a rotating tool such as said grindstone or circular saw to the drive shaft of an electric tool, in conventional practice a flange and a male thread are formed at the end of the drive shaft, the rotating tool is inserted over this male thread, and a clamp screw formed with a female thread, for example a nut, is screwed on outside of this, this nut then being clamped using a tightening tool such as a wrench.
Since said electric tool is a manual type (portable), when using a wrench for clamping as described above, the alignment of the electric tool is unbalanced, and its work performance deteriorates. Thus if the above-mentioned clamping nut can be attached by rotation using a manual operation only, work performance will be greatly improved. Moreover, clamping using reverse thrust from the use of the rotating tool will be even more effective. However, when the nut is rotated in a manual operation, a loss in clamping force occurs due to the frictional resistance in the thread portion of said male thread and the female thread of the nut, with the difficulty that it is not possible to create a sufficient clamping force using the force of a manual operation alone. Moreover, there is the disadvantage that if the reverse thrust of the rotating tool is used without being checked, too much clamping may occur so that it cannot be removed.
Problems To Be Resolved by the Invention
This invention has as its purpose the provision of a clamp screw in which the loss of clamping force is greatly reduced, a powerful clamping force can be obtained with a small rotational input, a sufficient clamping force can be obtained by a manual operation, and moreover, a sufficient clamping force can be obtained without excessive clamping by making effective use of the reverse thrust of the rotating tool.
Means of Resolving the Problems
The invention of claim 1 of the invention is characterised by being a clamp screw which is provided with a threaded member with a threaded part having a female or male thread formed on a shaft part and which screws onto a threaded attachment part, and with a shaft-shaped peripheral part formed on its outer surface, an operating ring whose inner part is inserted over the shaft-shaped peripheral part of said threaded member, and to which a rotational force is input externally, and a flange ring fitted facing said operating ring so as to freely rotate on said shaft-shaped peripheral part of said threaded member and permitted a slight movement in the axial direction, and in contact with the attached object, thread grooves of the same respective thread pitch being engraved into the inserted and engaged inner and outer surfaces of said threaded member and operating ring, a plurality of balls being fitted into said thread grooves, a restraining ring being installed between said operating ring and flange ring with slight freedom of movement in the axial direction with respect to the threaded member but prevented from rotating, a spring means being fitted between said restraining ring and operating ring, which returns said operating ring to its initial position allowing for the set number of turns in the clamping range, and a dry metal being fitted between said restraining ring and flange ring in contact with both of these and applying the required frictional resistance.
The invention of claim 2 of the invention, in addition to the structure of the invention of claim 1, is characterised by being a clamp screw in which a thrust bearing is fitted between said operating ring and restraining ring.
The invention of claim 3 of the invention, in addition to the structure of the invention of claim 1, is characterised by being a clamp screw in which said balls, in additio
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Power Tool Holders Incorporated
Wilson Neill
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