Chucks or sockets – Socket type – Obliquely guided reciprocating jaws
Patent
1998-12-04
1999-11-16
Bishop, Steven C.
Chucks or sockets
Socket type
Obliquely guided reciprocating jaws
279140, 279902, B23B 3112
Patent
active
059843209
DESCRIPTION:
BRIEF SUMMARY
DETAILED DESCRIPTION
1. Technical Field of the Invention
This invention relates to a tool chuck which grips tools such as the drill bit of an electric drill or the driver bit of an electric screwdriver.
2. Prior Art
There are various examples in prior art of tool chucks which can be powerfully clamped using the grip of a hand and without using a chuck handle (for example, Japanese Patent Application Nos. 2-80395 and 2-213245), but if these are exposed to continuous strong vibration during work, the grip of the chuck is frequently loosened.
Problems to be Resolved by the Invention
This invention has the purpose of providing a tool chuck which in addition to being able to clamp powerfully using the grip of a hand only, does not loosen its grips with a vibrating load.
Means of Resolving the Difficulties
This invention is characterized in being a tool chuck which in addition to being a tool chuck provided at the center of the chuck body with a plurality of chuck jaws set obliquely and able to slide open and shut, has a partial male thread engraved around the outside of said chuck jaws, and is provided with a nut ring which screws onto this partial male thread and which screw feeds said chuck jaws in the direction of opening and closing, the rotational force of an operating ring fitted onto said chuck body being transmitted to said nut ring, each chuck jaw sliding in the direction of opening and closing, the tool being gripped by the closing of said chuck jaws, an input ring being fitted into and fixed to the inner surface of said operating ring facing the nut ring, a thrust ring being fitted between the inner side of said input ring and the chuck body which positions a ball holder on the chuck body side, a ball thread being formed between the inner face of said input ring and the outer face of the nut ring opposing it, which screw feeds the nut ring in the direction of thrust upon rotation of the input ring in the direction of clamping by means of the balls held in a retainer, the inner end of said nut ring engaging with the inner surface of said ball holder, and having a return spring fitted between said operating ring and nut ring, and which returns said nut ring when the clamping load of the nut ring is released.
When the tool chuck of the invention firmly grips a tool, up until the chuck jaws close on the tool, the rotation of the operating ring rotates the nut ring with the retaining force of the return spring sliding the jaws in the direction of closing, thus gripping the tool.
As the tool is gripped, the rotational resistance of the nut ring becomes larger, and when the rotation stops, the subsequent rotation of the operating ring is converted into screw feed of the ball thread formed between the input ring and the nut ring.
In other words, with the cessation of rotation of the nut ring, a relative rotation occurs with the input ring which rotates integrally with the operating ring and the nut ring, and the rotation of the input ring creates a rolling movement which causes the balls in the ball thread to roll around the thread grooves, and by the movement of these balls the nut ring screw feeds and pushes outward.
With the screw feed of the above ball thread, since the ball thread is formed in the outside of the nut ring, the thread gauge of said ball thread can be made large, and for this reason the thread angle can be made small. As a result, since a small amount of screw feed is obtained from a large amount of rotation of the input ring, the ratio of the amount of nut ring screw feed to the amount of rotation of the input ring can be made large, resulting in a large amount of torque being obtained.
In addition, the rolling movement of the balls in said ball thread involves rolling of the balls, so with screw feed of the nut ring carried out with balls rotated with a 1/2 rotation of the input ring, since the balls roll around there is no loss in the rotation input from the input ring (the efficiency of rotation transmission is good) and a great increase in torque can be obtained.
With the incre
REFERENCES:
patent: 2784976 (1957-03-01), Ondeck
patent: 3894743 (1975-07-01), Hiroumi
patent: 4423881 (1984-01-01), Whitehead
patent: 5044643 (1991-09-01), Nakamura
patent: 5261679 (1993-11-01), Nakamura
patent: 5411275 (1995-05-01), Huff et al.
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