Tool driving or impacting – Impacting devices – With means for rotating tool
Patent
1991-01-22
1991-12-31
Yost, Frank T.
Tool driving or impacting
Impacting devices
With means for rotating tool
279 75, 279 193, 408226, B23B 3122
Patent
active
050763717
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a tool for use in hand power device, i.e., such as percussion drilling devices and comprises two recesses which are closed axially at both sides, located diametrically opposite one another, and cooperate with locking bodies, at least three rotary driving grooves for strip-shaped rotary drivers, which rotary driving grooves are open out at the rear end of the tool shank, are arranged on both sides of a longitudinal plane extending through the two recesses, and are arranged so as to be distributed along the circumference in such a way that two rotary driving grooves are never located diametrically opposite one another in any case.
A tool of the type under consideration is known from DE-P 37 16 915.7. The tool comprises recesses at its shank which are closed at both sides and located diametrically opposite one another, and rotary driving grooves which open out toward the rear end of the tool shank, are provided at both sides of a longitudinal plane extending through these recesses. In order to prevent the tools from being inserted incorrectly, the rotary driving grooves are arranged asymmetrically in such a way that two of them are never located diametrically opposite one another.
While this known tool can fully meet requirements with respect to use, the asymmetrical arrangement of the rotary driving grooves results in an irregular cross-sectional division of the remaining cross-section of the tool shank, particularly as seen from the longitudinal plane extending through the recesses. As a result of this irregular cross-sectional division, production of the rotary driving grooves in particular is only possible by a machining operation, which leads to disadvantages in production chiefly in economical respects. A non-cutting shaping is not possible without subsequent extremely costly aligning processes because of the volume which must be shaped irregularly.
SUMMARY OF THE INVENTION
The object of the invention is a tool that can be produced economically, particularly by non-cutting shaping methods.
This object is met, according to the invention, by providing a tool in which the sum of the cross sections of the rotary driving grooves arranged on one side of the longitudinal plane substantially corresponds to the sum of rotary driving grooves arranged on the other side of the longitudinal plane, and the rotary driving grooves are arranged and constructed on each side of the longitudinal plane so as to be symmetrical relative to a plane of symmetry extending vertically through the longitudinal plane.
As a result of the arrangement of the rotary driving grooves, according to the invention, the forces to be applied in a non-cutting shaping process undergo a uniform distribution. The force components in the direction parallel to the longitudinal plane in particular are also mutually canceled as a result of the symmetry with respect to the plane of symmetry extending vertically relative to the longitudinal plane. Because of the material cross-sections achieved by adapting the cross-sections and alignment with respect to the plane of symmetry, there is a mutual canceling of the force components vertical to each of the planes extending through the longitudinal axis.
The number of rotary driving grooves on one side of the longitudinal plane is preferably greater than the number of rotary driving grooves on the other side, which has the advantage that the arrangement of the rotary driving grooves on both sides of the longitudinal plane can also be distinguished from one another above all visually. Accordingly, it is made easier for the person operating a hand machine tool outfitted in this way to insert tools.
As to the dimensioning with respect to the arrangement of grooves and recesses, the preferred arrangement of three rotary driving grooves achieves good proportions in such a way that there is a sufficient remaining cross-section which serves particularly for guiding.
All rotary driving grooves preferably have the same length, so that the forces are distributed
REFERENCES:
patent: 4107949 (1978-08-01), Wanner et al.
patent: 4131165 (1978-12-01), Wanner et al.
patent: 4512692 (1985-04-01), Nielsen
Obermeier Josef
Rumpp Gerhard
Robert & Bosch GmbH
Smith Scott A.
Striker Michael J.
Yost Frank T.
LandOfFree
Tool for use in a hand power device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tool for use in a hand power device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tool for use in a hand power device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1503452