Tool driving or impacting – Impacting devices – With anvil arranged to transmit torsional impact to tool
Patent
1996-09-16
1998-04-07
Smith, Scott A.
Tool driving or impacting
Impacting devices
With anvil arranged to transmit torsional impact to tool
173218, B25B 2102
Patent
active
057353549
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on a pulse impact mechanism of the type defined in claim 1. A pulse impact mechanism is already known (EP 460 592 A1) in which rotary pulses are generated by means of radially outwardly directed and radially movable spring-loaded plates that at least temporarily separate high-pressure spaces and adjacent low-pressure spaces sealingly from one another. The plates have specially shaped sealing surfaces on their exterior that, in order to prevent leakage losses, must be produced as accurately as possible, which requires a relatively high level of production engineering complexity.
SUMMARY OF THE INVENTION
The pulse impact mechanism according to the invention has, on the other hand, the advantage of having substantially simpler and more accurately manufacturable rotationally symmetrical sealing surfaces, so that production-related dimensional and/or geometrical deviations, and the leakage losses that go along with them, can be reduced. A compact construction in the axial direction can be achieved by configuring the pulse impact mechanism with at least one reciprocating piston acting in the radial direction.
Advantageous developments and improvements of the pulse impact mechanism are made possible by means of additional features.
BRIEF DESCRIPTION OF THE DRAWINGS
Exemplified embodiments of the invention are depicted in the drawings and explained in greater detail in the description which follows. In the drawings, FIG. 1 shows a longitudinal section of a first exemplified embodiment of a pulse impact mechanism configured in accordance with the invention; FIG. 2 shows a cross section along line II--II in FIG. 1; FIGS. 3 and 4 each show cross sections through two further exemplified embodiments of a pulse impact mechanism; FIGS. 5, 6, and 7 show a fourth exemplified embodiment; FIG. 8 shows a cross section through a fifth exemplified embodiment; FIG. 9 shows a longitudinal section through a sixth exemplified embodiment; and FIG. 10 shows a cross section along line X--X in FIG. 9.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The pulse impact mechanism depicted in FIG. 1 has a cylindrical rotation element 13 that can be driven rotatably, via a driving shaft 14 by means of a drive motor (not depicted further), about a rotation axis 15, for example in the direction of an arrow 15a. Rotation element 13 has at its end facing away from driving shaft 14 a central receiving opening 16, passing almost completely through rotation element 13, in which a cylindrical core part 17 is concentrically arranged. Located perpendicular to rotation axis 15, approximately centered in rotation element 13, is a radial bore 18 in which a reciprocating piston 19 is received in radially displaceable fashion. Located in reciprocating piston 19 is a through opening 20 that extends perpendicular to the stroke direction of reciprocating piston 19 in the axial direction, and in which core part 17 projects through reciprocating piston 19 with clearance. Radial bore 18 can be closed off with a cover 21, and sealed off from the outside by means of suitable sealing means 22.
Core part 17 is coupled in rotary engagement with a driven shaft 25 that is equipped at the end with an attachment device for a screw tool, for example for a screwing device bit. In this example, core part 17 and driven shaft 25 are joined integrally together. Core part 17 is configured at the end of driven shaft 25. Core part 17 and driven shaft 25 are mounted in receiving opening 16 rotatably in the circumferential direction with respect to rotation element 13. In the exemplified embodiment, mounting occurs in bearing seats 27 and 28, each alongside radial bore 18. A bearing seat 28 located closer to attachment device 26 is constituted by two annular collars 29 and 20, arranged at an axial offset from one another, of core part 17, between which a sealing ring 31, which seals receiving opening 16 from the outside, sits in an annular groove 32. Core part 17 is fixed in the axial direction inside rotation element 13 by a ret
REFERENCES:
patent: 2850128 (1958-09-01), Van Sittert
patent: 2940566 (1960-06-01), Conover, Jr.
patent: 3561543 (1971-02-01), Ulbring
patent: 4557337 (1985-12-01), Shibata
Backe Wolfgang
Klenk Robert
Schneider Egbert
Weidner Horst
Robert & Bosch GmbH
Smith Scott A.
Striker Michael J.
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