Chucks or sockets – Socket type – Radially reciprocating jaws
Reexamination Certificate
2000-07-10
2001-11-06
Howell, Daniel W. (Department: 3722)
Chucks or sockets
Socket type
Radially reciprocating jaws
C279S905000
Reexamination Certificate
active
06311989
ABSTRACT:
FIELD AND BACKGROUND OF THE INVENTION
The invention relates to a chuck for screwdriver inserts, having an insertion cavity of a bush, the insertion cavity being adapted in cross section to the polygonal section of the insertion shank of the bit, windows opposite one another in the corner region of the insertion cavity being located in the bush, and round clamping bodies lying in said windows on supporting shoulders, the diameter of which clamping bodies is greater than the window wall thickness and which are loaded inward toward the cavity by an inclined surface of a spring-loaded actuating sleeve and press in point contact against the corner of a corner recess of the insertion shank.
In such known chucks on the market, the bush has round clamping bodies in opposite windows in the corner region of the insertion cavity, the clamping bodies being arranged in the same cross-sectional plane. These clamping bodies act jointly on the corner recesses of the insertion shank.
SUMMARY OF THE INVENTION
The subject matter of the invention, is based on the object of developing a chuck of the introductory-mentioned type in such a way that an expanded range of bits can be held captive in the insertion cavity of the bush.
This object is first of all and essentially achieved in a chuck wherein the two clamping bodies are offset from one another in the axial direction in such a way that, in the case of a corner recess in the form of an annular flute, the rear clamping body sits on the corner, and the front clamping body, lying on the supporting shoulders, projects freely into the annular flute, and, in the case of a corner recess in the form of a prismatic notch or in the form of a bevel, the front clamping body sits on the corner and the rear clamping body bears against an edge of the shank polygon.
As a result of such a configuration, a chuck of the type in question having an increased range of use is created. On account of the clamping bodies offset from one another in the axial direction, it is now possible for three screwdriver bits formed differently with regard to their insertion shank to be assigned to a single chuck. On the one hand, the screwdriver bits can be formed in such a way that they form an annular flute on the insertion shank. The rear clamping body, as viewed in the insertion direction of the screwdriver bit, then acts against the corner of the annular flute, while the front clamping body projects freely into the annular flute and exerts no clamping action there. The front clamping body is supported by supporting shoulders of the bush, which are located in front of the windows. Screwdriver bits in which the corner recesses are formed by prismatic notches on the insertion shank can then be used. While the front clamping body sits on the corner, the rear clamping body is supported on the relevant edge of the shank polygon. This likewise applies to screwdriver bits in which the corner recess is formed by a bevel which results as a transition surface from the polygonal section to a stepped section of round cross section. With all the different screwdriver inserts, stable seating in the insertion position is realized. Only a single chuck is required for three screwdriver inserts of different configuration, so that this leads to a saving in tools. In this case, the invention makes use of the fact that there are standards with regard to the relevant corner recesses, so that, if there is an appropriate distance between the two clamping bodies, as viewed in the axial direction of the polygonal section of the insertion shank, one of the clamping bodies is always seated in an interlocking manner relative to the corner recess in accordance with the specifications. An advantageous development, according to the invention, consists in the fact that both clamping bodies are subjected to pressure in the radial direction by the facing inclined surfaces of the actuating sleeve. Accordingly, the two clamping bodies are acted upon radially by means of one and the same actuating sleeve, so that these clamping bodies can assume their respective corresponding position in accordance with the intended purpose. Finally, an advantageous feature also consists in the fact that the clamping bodies are formed as balls. Accordingly, components which can be produced cost-effectively may be used for the chuck according to the invention.
REFERENCES:
patent: 3091473 (1963-05-01), Bilz
patent: 4828277 (1989-05-01), De Bastiani et al.
patent: 5934846 (1999-08-01), Ishii
patent: 6059296 (2000-05-01), Baeder
patent: 6092814 (2000-07-01), Kageler
Farber Martin A.
Howell Daniel W.
Washington Terrence
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