Tools – Wrench – screwdriver – or driver therefor – Responsive to movement of work
Reexamination Certificate
1997-09-22
2001-02-27
Scherbel, David A. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Responsive to movement of work
C081S451000
Reexamination Certificate
active
06192776
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a coupling for chucks for tightening cap screws and/or studs.
BACKGROUND
Couplings of the above type are known and described for example in German patent Nos. 2,621,932 and 3,423,558. This coupling involves a stamped and bent component which for manufacturing reasons can have neither an optional thickness nor hardness. The known component, which is cold-hammered, is therefore subject to wear which, particularly when processing large wood screws which require a considerable screwing in torque to assemble them, very quickly makes its replacement necessary. Consequently replacement coupling discs must have been made available to the user who must replace these.
SUMMARY OF THE INVENTION
The purpose of the present invention is to develop an improved economical chuck of this type, so that the coupling is practically free of wear and can also be used under the hardest circumstances of operation.
It is recognized that the invention is realized when both the drive shaft and the screw shaft are provided with external polygons, which can be connected together in a power-locking fashion by a sleeve. The sleeve is in turn equipped with corresponding internal engaging polygons. By means of these polygons, which can be pushed on to one another to engage each other, the operational connection between the screw shaft and the drive shaft can be produced without problems. This coupling of the two shafts likewise provides no problems. In this case a coupling sleeve is used which is axially displaceable by an adjusting disc. A more detailed description of the function of the coupling sleeve and of the chuck is expressly described in related German patent No. 2,621,932 which shows a chuck of a bearing sleeve, a clamping sleeve, and a screw shaft. The clamping balls are radially displaceably disposed in the clamping sleeve, and surround the shaft of the screw that is to be screwed in. The clamping sleeve surrounds the bearing sleeve. The screw shaft passes through the bearing sleeve, it is axially displaceable and provided with a screw carrier. The bearing sleeve and the clamping sleeve are axially displaceable against the bias force of a spring in the same direction. The clamping sleeve has an clamping cone in the range of the clamping balls, and the clamping cone presses the clamping balls together under the pressure of the spring, and against the screw shaft. Space is provided axially, next to the clamping cone for locating the clamping balls therein as the screw is introduced. The polygons used in the invention are preferably in the form of hexagons. The hexagon of the drive shaft is suitably so formed that its width across corners roughly corresponds to the diameter of the shaft. In this way the minimum possible force is necessary for transmitting the torque.
REFERENCES:
patent: 2152977 (1939-04-01), Schindel
patent: 2430044 (1947-11-01), Campsmith
patent: 4237946 (1980-12-01), Leitner
patent: 4753142 (1988-06-01), Hornung
patent: 4809572 (1989-03-01), Sasaki
patent: 5341708 (1994-08-01), Nick
patent: 5682800 (1997-11-01), Jore
patent: 1293699 (1969-04-01), None
patent: 26 21 932 (1977-11-01), None
patent: 3330962 (1985-03-01), None
patent: 3429558 (1986-02-01), None
patent: 086 352 (1983-08-01), None
Danganan Joni B.
Gabriel P. Katona L.L.P.
Optigrip-Werkzeuge
Scherbel David A.
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