US1866529A - Reciprocatory hand tool for flexible shafts - Google Patents

Description

July 12, 1932.

M. J. FARKAS RECIPROCATORY HAND TOOL FOR FLEXIBLE SHAFTS Filed May 5, 1931 fnapnfor Patented July 12, 1932 UNITED STATES- MICHAEL J. FARKAS, OF BRIDGEPORT, CONNECTICUT BECIIPROCATO RY HAND TOOL FOR FLEXIBLE SHAFTS Application filed m 5, 1931. Serial No. 535,197.

My invention relates to reciprocatory hand tools but more particularly has reference to such tools as are operated by means of flexible shaft connections, so that the tool may of the rotary member is a keeper be grasped by hand and manipulated in any desired manner.

In the accompanying drawing which is to be read as a part of this description Figure 1 is an elevation of the completed hand tool with any suitable tool secured therein, in the present instance, a saw,

Figure 2 is a section at the line 22 of Figure l, and

Figures 3, 4 and 5 are respectively sections at the lines 3-3, 44=, and 5-5 of Fi ure 2.

gimilar numerals of reference denote like parts in the several figures of the drawing.

1 is a stationary cylindrical casing having at its front end a threaded reduced portion 2, and 3 is a rotary member mainly contained within the casing and having a reduced hollow shank 4 extending from its rear and threaded at its outer end for the purpose presently to be explained.

3 are ball bearings 6, the threaded adjust ment bet-ween the casing 1 and block 5 being such that these bearings will easily function in the usual manner. Driven on the threaded rear end of the reduced ortion 4 and between the latter and the rear end of the block 5 are ball bearings 8, the adjustment of this keeper being such that these bearings will easily function in the usual manner. 9 is a nut driven on the threaded end of the portion 4 against the keeper 7, and 10 is a am nut driven on said portion against the nut 9 so that it will be clear that the keeper 7 will always preserve its proper position.

11 is the rear casing interiorly threaded at its front end and secured by a left hand thread to the rear end of the block 5, and this casing has tapped within its rear end a block 12 which is hollow and through which extends a shaft 13 whose forward terminal is flattened so as to be half round, as seen at 14, and against this flattened surface 14 is a block 15 which extends through an opening in the portion 4, the outer surface of this block being threaded as a continuation of the threads on the rear end of said portion, and the driving of the keeper 7 on the end of the portion 4 serves to keep this block in posit-ion, so that any rotary movements of the shaft 13 will be communicated to the block and likewise to the rotary member 3.

It will thus be noted that this rotary member has ball bearings both at the front and rear of the block 5 so that said member will revolve quite freely.

The shaft 13 is connected to a flexible shaft in any suitable manner, and as the flexible shaft would receive its rotation from any suitable motor, it will be clear that the rotary member will be readily operated.

The front end of this rotary member is hollow and provided with a suitable tight bushing 16, within which latter is a member 17 capable of free reciprocations.

At spaced locations around this member 17 and in the reduced portion 2 of the stationary casing 1 are circular elongated channels 18 and 19 respectively, and within these grooves are steel balls 20 which not only look the member 17 as against rotation but facilitate the reciprocatory movements of such member.

A felt washer 21 surrounds the member 17 immediately in front of the balls 20, and a keeper ring 22 likewise surrounds said mem her and has a shoulder 23 that abuts the Washer 21, and a threaded nozzle 24 is driven on the threads of the portion 2 and has a shoulder 25 which is thereby forced firmly against the shoulder 23 thus binding the washer 21 against the end of the portion 2,

whereby not only is dirt excluded from the a saw 28 has its tang 29 secured within said holder by a set screw 30 or otherwise.

An inclined annular groove 31 is formed around the reciprocatory member 17 and a set screw 32 having a socket 33 in its inner end is driven through the rotary member 3, a steel ball 34 being assembled within said socket and propelled by the screw into the groove 31, the ball being contained half way in the socket and half way in the groove, and

the set screw bein driven only far enough to prevent the ball rom binding in the groove but allowing it free movement therein. Any suitable means, as a wire 35, engaged within the slot of the screw and tight around the rotary member 3, is employed to hold the screw stationary after its proper adjustment, so that it will readily be understood that when the member 3 revolves it will cause lengthwise reciprocations of the member 17 and the tool carried thereby.

While the invention has been described in detail, it will be clear that there may be various modifications employed all within the range of ordinary mechanical skill without departing from the spirit of the invention.

What is claimed is 1. A reciprocating tool holder and mechanism, comprising a hollow stationary casing having a reduced hollow shank portion extending from its front end, a hollow rotary member having a reduced hollow shank ortion extending from its rear end con ned therein containing the reciprocating mechanism, a block bearing spaced from and surrounding the hollow rear shank portion, ball bearings arranged at each end of the block, one set of ball bearings being arranged to bear against the hollow rotary member, the

40 other set being arranged to bear against a keeper driven on the outer end of the hollow rear shank portion.

2. A device of the character described in claim 1, having a reciprocatory member within said rotary member, means for preventing rotation of the reciprocatory member, a tool holder carried at the end of the latter, and interengaging means associated with said rotary member and reciprocatory member for causing lengthwise reciprocations of the latter.

In testimony whereof I afiix my signature hereto. MICHAEL J. .FARKAS.

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