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Publication numberUS2821872 A
Publication typeGrant
Publication dateFeb 4, 1958
Filing dateNov 9, 1956
Priority dateNov 9, 1956
Publication numberUS 2821872 A, US 2821872A, US-A-2821872, US2821872 A, US2821872A
InventorsGeorge Salfer Donald
Original AssigneeGeorge Salfer Donald
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Portable power drill attachment
US 2821872 A
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Description  (OCR text may contain errors)

Feb. 4, 1958 D. s. SALFER I 2,821,872

PORTABLE POWER DRILL ATTACHMENT Filed Nov. 9, 1956 2 Sheets-Sheet l v 3/ O Z9 Z7 0 F IG. 2

INVENTOR. DONALD G. SAL 52,

Feb. 4, 1958 D. G. SALFER 2,821,872

PORTABLE POWER DRILL ATTACHMENT Filed Nov. 9, 195a 2 Sheets-Sheet 2 FIG. 3. C 3

IO /3 1 Q4 IN VEN TOR. oo/mz 0 G. 544 P52,

ATTOZ/VE Y5.

r dswtes Pa w The present invention relates to an attachment for a portable power drill for supporting and feeding the drill into a work piece.

An object of the present invention is to provide an attachment for a portable power drill which lends itself to ready attachment to a work piece for feeding the drill into the work piece, one which is readily and easily mounted upon the steadying handle of the drill and serves as a steadying handle of the drill when attached, as well as one which is sturdily constructed and of simple structure, economical to manufacture and assemble, and one which is highly effective in action.

These and other objects and advantages of the present invention will become fully apparent when taken in connection with the annexed drawings, in which:

Figure 1 is an elevational view of a part of a power drill with the attachment of the present invention installed thereon, showing the drill in operation drilling a work piece, the arrow illustrating the direction of movement of the handle of the attachment for feeding the drill into the work piece;

Figure 2 is a plan view of the assembly of Figure 1;

Figure 3 is an end view of the assembly of Figure 1;

Figure 4 is a sectional view, on an enlarged scale, taken on the line 44 of Figure 3; and

Figure 5 is a sectional view, on an enlarged scale, taken on the line 55 of Figure 3.

Referring in greater detail to the drawings in which like numerals indicate like parts throughout the several views, the attachment of the present invention is for use with a portable power drill, indicated by the reference numeral 10, andhaving a steadying handle 11 projecting perpendicularly from the housing of the drill 10. The attachment comprises an outer sleeve 12 and an inner sleeve 12' circumposed about the steadying handle 11 so that one end of the sleeve 12 is adjacent the inner end of the steadying handle 11 and the other end of the sleeve is inwardly of and adjacent the outer end of the steadying handle 11.

A lever 13, disposed horizontally, is arranged longitudinally of the sleeve 12 and on one side thereof and has a portion adjacent one end extending beyond the sleeve and which is adjacent the inner end of the steadying handle 11 and has the portion adjacent the other end extending beyond the other end of the sleeve 12, the latter sleeve ending adjacent the outer end of the steadying handle 11. On the other side of the sleeve 12 another lever 14 is similarly positioned and is arranged in parallel spaced relation with respect to the lever 13.

Means is provided connecting the portions of the levers 13 and 14 adjacent the inner end of the steadying handle 11 to a sleeve 12 for upward and downward movement about horizontal axes. Specifically, this means embodies a pair of diverging arms having their converging ends fixedly secured to the sleeve 12, the arms being indicated by the reference numerals 15 and 16, portions of the arms 15 and 16 adjacent to and inwardly of their diverging ends being longitudinally of the adjacent portions of the levers Patented Feb. 4, 1958 2 a 13 and 14. The diverged ends of the arms 15 and 16 are pivotally connected to the levers 13 and 14, respectively, inwardly of their ends which project beyond the inner end of the steadying handle 11 for upward and downward movement of the levers 13 and 14 about their pivot points as an axis.

In Figure 4, it will be seen that'the lever 13 is pivotally connected to the arm 15 by means of a bolt 17, there being provided a frictionless bearing bushing 18 serving as a mounting for the bolt 17 and having a flange 19 interposed between the adjacent portions of the lever 13 and the arm 15. The lever 14 is similarly connected to the arm 16.

Means embodying a handle 21 connects the other ends of the levers 13 and 14 together, the handle 21 being movable downwardly, as indicated by the arrow in Figure 1, for moving the levers 13 and 14 together downwardly.

Means is provided on the ends of the levers 13 and 14 adjacent their points of connections to the arms 15 and 16 for engaging a work piece 22 for moving the drill 10 toward the work piece 22 upon execution of movement of the handle 21 downwardly. Specifically, this means comprises a loop of chain 23 having one end fixed to one end of the lever 13 and the other end fixed to the end of the lever 14.

Spring means is provided for urging the levers l3 and 14 to their upward movement position and, specifically, this means consists in a pair of springs 24 and 25, the spring 24 having one end fixed to the lever 13 and the other end fixed to the sleeve 12, and the spring 25 having one end fixed to the lever 14 and its other end fixed to the sleeve 12.

Set screws 27 and 31 are provided and are threaded into tapped holes in the ends of the sleeve 12'.

In operation, the attachment of the present invention is quickly installed upon the steadying handle by slipping the sleeve 12 thereover. The sleeve 12 is then slipped over the inner sleeve 12 and the set screws 27 and 31 are inserted in the holes in the sleeve 12 and drawn up snug. The chain 23 is rapidly looped under a work piece 22 and with the motor of the drill 10 turning the bit 28, pressure downwardly upon the handle 21 will serve to steady the drill 10 and also feed the bit 28 through the work piece 22.

The drill 10 is of conventional manufacture having a pistol grip handle 29 and a breast-rest handle 31.

What is claimed is:

1. An attachment for a portable power drill having a steadying handle having an inner end and an outer end comprising a sleeve circumposed about said steadying handle so that one end thereof is adjacent the inner end of said steadying handle and the other end is adjacent the outer end of said steadying handle, a lever arranged longitudinally of and on each side of said sleeve and having the portion adjacent one end beyond said sleeve one end and having the portion adjacent the other end beyond said other sleeve end, means connecting the portions adjacent said one end of said levers to said sleeve for up and down movement about horizontal axes, means connecting the other ends of said levers for movement together, and means carried by said one ends of said levers adapted to engage a work piece and operable to feed said drill into said work piece upon execution of downward movement of said levers.

2. An attachment for a portable power drill having a steadying handle having an inner end and an outer end comprising a sleeve circumposed about said steadying handle so that one end thereof is adjacent the inner end of said steadying handle and the other end is adjacent the outer end of said steadying handle, a lever arranged longitudinally of and on each side of said sleeve and having the portion adjacent one end beyond said sleeve one end andhaving the portion. adjacent the other end beyond said other sleeve end, means connecting the portions adjacent Said one end of said levers to said sleeve for up and down movement about. horizontal: axes rneans' connecting t the'other ends ofisaidlev'ers for movemenbtogethen means carried ,by saidlone endsof 1 saidlevers-adapted-to engage a work-"piece land operable to feed said drilll-l-into -said work, 1 pieceiupon execution -ofi downward movement-of said levers, and spring means operatively eonnectingsaid levers to said sleeve-for urgingsaid levers tow-ardlupward movementtposition.

, 3" An attachment-tor a portable,' power -drill-having a steadying handle having an inner -end 'andmn. outer end eomprising aa sleeve -circurnposed- --about sa-id steadying handle-so: that one :end. thereofi is adjacent the inner -end of said steadying handle and the other end is adjacent the 'outer end of said-steadying handle; a lever arranged lo'ngh tudinajlly of-and on each' side of said sleeve a-ndhaving the portion adjacent one end. beyond Esaid sleeve one end and having theportion adjacent the othen'end-beyondsaid other sleeveend, rneans embodyi-nga-j-tpair of diverging arms each havingits diverging- \e'nd connectedlto the portion of the adjacent-lever adjacent said-one end thereof for upand down movement of said-leverabout a-hori- .zontal axis and having its-converging end fixedly secured to saidsleeve inwardly of said one end of the latter, means connecting 1 the-other ends 'ofwsaidlevers for: movement together, means carried by said one ends ofti-saidievers -adaptedto engageawork piece andgop efablfl tfl feed Isaid drill rinto-Tsaimworlo} piecemupon execution ofdownward movement oisaid levers;

4. An attachment for a portable power drill having a steadying handle having an inner end and an outer end comprising a sleeve circumposed about said steadying handle so that one end thereof is adjacent the inner end of said steadying handle and the other end is adjacent the outer end of said steadying handle, a lever arranged longitudinally of and on each side of said sleeve and having the portion adjacent one e'ndbeyond said sleeve one end and havingthe portion axijaeent: theother end beyond said other sleeve end, means embodying a pair of diverging arms eacli having 'its diverging-end eonn'eeted" to the portion-of the adjacent-leveradjacent said one end thereof for up and'down movement of said lever about a horizontal axis, and l iavi-ngiits converging end fixedly secured to said sleeve inwardly of said one end of the latter, means embodying a handle connecting the other ends of said levers for movement together, means embodying a loop ofi flexibletchain carried by-said one ends of. said levers adapted .toie ngage a work piece and operable "to feed said drill into said workpiece upon execution of'downward movement of said levers, and .spring, means operatively connecting said levers to saidsleeve for urging said levers 'toward their upward movement position.

' 'Refere'nceslCited' iii the file" or this patent --.'UNITE-D S F-A ITES' PATENTS

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2362929 *Dec 19, 1941Nov 14, 1944Taliesin Richards JPressure handle for pneumatic and electric portable drills
US2695525 *Mar 3, 1950Nov 30, 1954H & O Tool CompanyPortable drill jack
US2772585 *Apr 30, 1954Dec 4, 1956Salfer Donald GPower drill attachment
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4168926 *Dec 30, 1977Sep 25, 1979Rudolph BelcourtLever device for power drill
US7052216Jan 11, 2005May 30, 2006Fields Robert MWork saver for an electric drill
US7140813 *Jul 15, 2003Nov 28, 2006Tucker Bradley JLine boring machine
US7641424Aug 24, 2005Jan 5, 2010Allen Ip, IncorporatedNon-pneumatic clamp and drilling system
US7811033May 22, 2008Oct 12, 2010Allen Ip, IncorporatedTool with remote switch
US8596936Sep 29, 2009Dec 3, 2013George McKENZIEApparatus for applying leverage force to a hand drill
USRE44289May 20, 2010Jun 11, 2013Allen Ip Inc.Pocket hole drilling machine
Classifications
U.S. Classification408/92
International ClassificationB23B45/14, B23B45/00, B25H1/00
Cooperative ClassificationB25H1/0057
European ClassificationB25H1/00C4