US1215439A - Power-driven tool. - Google Patents

Description

MAM @M4 H. WAGNER. POWER vDRIVEN TOOL. APPLICATION FIL-ED MAY 22. |916.

Patented Feb. 13, 1917.

HUBERT WAGNER, OFGAUTING, NEAR MUNICI-I, GERMANY.

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Specification of Letters Patent.

Application filed May 22, 1916. Serial No. 99,260.

To all whom it may concern: Y

Be it known that I, HUBERT VAGNEma subject of the German Emperonand residing at Gauting, near Munich, Germany,

tain new and useful improvements in powerdriven tools, and relates more specifically to a novel combination tool, driven'by flexible shafting in either direction and adapted to be used either as percusslve hammer, chisel or the like, or as rotary drill, and the invention essentially consists of the construction, arrangement and cooperation of parts as will hereinafter be fully described and claimed. 1

My improved tool is of the spring-hammer class, in which a plunger within'the cylindrical handle is reciprocatorily actuated in axial direction by a rotor which is driven in suitable manner, for instance by a flexible shaft. From well known constructions of this type the present tool diers in that the impulsion of the hammer-head Iplunger is not caused by the action of a spring, but by having teeth on the crown ofthe shaft-driven rotor act directly on similar facing teeth on the bottom of the driven plunger, the spring here being used foralways retaining the driven plunger in operative contact with the rotor. Upon reversmg the direction of power, the tool can be used as an ordinary drill, the sets of teeth intercoupling and the plunger then constituting also a rotor, and the two rotors rotating jointly.

The described arrangement of having'lthe rotor and the plunger extend co-axially of each other, serves to impart a strictly axially directed impulsion to the active tool head and to reduce the wear to a minimum, since the evenly distributed ratchet teeth are all in use simultaneously, so that a highly satisfactory operative effect is obtained.

In order to make my invention more readily understood, I will now describe it in detail with reference tothe accompanying drawing, which represents a longitudinal section through the tool, partly in elevation.

In the tubing a, which conveniently may serve as handle and which is closed above and below respectively by the centrally perforated closures al, a2, is loosely retained the rotor f which engages below with-thereonpling claw g and is rotated in well known manner, for instance by thevexible shaft Z secured to the coupling member g. The upper end of this rotor carries on its face a set of ratchet teeth el, which may be in one Patented nen. is, i917.

with the rotor or maybe provided'on a special head piece e, operatively connected to the rotor. Above this rotor is guided in vthe casing a and in the throat of the closure cap 0511 the drivenplunger b, whose lower face is likewise provided with a set vof ratchet teeth d1, which may also extend from the lower face of a' special, exchangeable foot-piece d, instead of being worked right out of the plunger base. The upper end of the plunger shank is provided with a longitudinally extending recess 11 into which extends loosely the set screw 7c threading in the wall of the top closure, for preventing hammering, but allowing free reciprocation thereof. A helical spring c, surrounding the plunger shank, is put under tension upon each forward thrust of the plunger and tends to always return the plunger teeth into operative contact with the rotor teeth. The chuck or socket la serves to receive the chisel, hammer, drill or the like.

The operation is the following :-On the power being turned on it is transmitted by the flexible shaft .Z to the clutch member g and in turn -to the'rotor.A The teeth of the latter, when traveling from right to left in the direction of arrow l, in cooperating with the plunger teeth impartto the plunger a continuation of axial reciprocations, the spring c alternately contracting and extending, and keeping the rotor and plunger always in close operative contact. The blows of the tool are strictly axially directed and thus of the highest degree of eliiciency.

Ifthe tool is to be used as drilling device, the rotor f must be rotated from left to right (arrow 2), when the two sets of teeth will form between thema clutch-coupling, and the member Z) willserve as drill spindle and rotate jointly with vthe rotor f. In this instance, obviously, the set screw 7c must be Vrotary displacement of the plunger when ing of practicallyV identical pitch and equal in number, means for retaining said plunger in yielding operative contact with said rotor, and means for preventing rotary movement but allowing axially reciprocatory movement of said plunger relative to said easing.

2. In a tool of the lcharacter set forth, the combination of a casing, a rotor therein adapted to be power-driven in either direction, a head piece to said rotor and ratchet teeth on said head piece,v a tool-receiving plunger in said casing, a foot piece to said plunger and ratchet teeth on said foot piece, saidrotor and said plunger With their respective toothed end pieces all being in axial v alinement, resilient means for allowing said plunger to ascend the height of said teeth but retaining it always in operative contact with said rotor, the said two sets of prac-v tically identically shaped and disposed ratchet teeth in conjunction With said resilient means allowing said rotor to operate von said plunger in a reciproea'tory lifting manner when rotating in the one direction,

and in a rotary manner When revolving in 2 the opposite direction, and means for preventing at Will rotary movement of said plunger relative to its casing.

3. In a tool of the character'set forth, the combination of a casing, a rotor therein adapted to be power-driven in either direction, ratchet teeth on said rotor, a tool-receiving plunger in said casing, ratchet teeth on said plunger, the said-sets of ratchet teeth cooperating With each other either slip- 3 pingly or couplingly according to the direction of "drive, a helical spring encircling the shank of said plunger and tending to yieldingly press the said plunger teeth home on the said rotor teeth, and releasable means for f1 preventing the said plunger from rotating `Within its casing.

ln testimony whereof I aiX my signature in presence of two Witnesses.

' HUBERT WAGNER. Witnesses:

W. S. SPEGITTERY, HARRY SGHMID.

Co'piesof this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

' Washington, D. C.

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