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Publication numberUS2713271 A
Publication typeGrant
Publication dateJul 19, 1955
Filing dateJul 17, 1951
Priority dateJul 17, 1951
Publication numberUS 2713271 A, US 2713271A, US-A-2713271, US2713271 A, US2713271A
InventorsCarl Dodegge
Original AssigneeMall Tool Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Motion converting means
US 2713271 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

July 19, 1955 Q DODEGGE 2,713,271

MOTION CONVERTING MEANS Filed July 17 1951 FIE- E (I, f V j] 7 a; 5 W99 96 555 64 25 z 55 F: 51,

'fi'hnm mm iii 7 PIE. 7 5;: i2 52 j 20 United States Patent Gfiice 2,713,271 Patented July 19, 1955 MOTION CONVERTING MEANS Carl Dodegge, Maywood, Ill assignor b y mesne ass! ments, to Mall Tool Company, Chic ago, 11]., a corp ration of Illinois Application July 17, 1951, Serial No. 237,194 4 Claims. (Cl. 74-50) This invention relates to attachments for power tools and more particularly to attachments for hand drills and the like.

A primary object of my invention is to provide a novel attachment for hand drills and the like, which may be powered by a rotative source of power such as the drive shaft of a hand drill and is effective, in a and expeditious manner, to drive hand tools operate with a reciprocatory motion.

Another object of my invention is to provide a novel attachment of the aforementioned type which is well balanced, easy to handle, and wherein the reciprocatmg hand tool member is driven substantially in alignment with the path of travel of the reciprocating drive member of the attachment.

A further object is to provide a novel attachment which may be readily assembled and disassembled, is sturdy in construction but is light in weight, and which is pracheal and eflicient in operation and may be readily manufactured commercially in an efiicient and economical manner.

Yet another object of my invention is to enable reciprocatory cutter members such as saws, files, knives, and the like, to be readily driven in a novel and expeditious manner, as an attachment to hand drills and the like, and, when so used, to afford novel, practical power driven devices for performing cutting operations such as sawing, filing or slicing.

A further object of my invention is to afford a novel attachment of the aforementioned type which may be quickly and easily attached to a hand drill or the like, and wherein a cutter member such as a saw, file or the like, may be quickly and easily inserted in, and removed from operative position in the attachment.

Another object is to provide a novel attachment of the aforementioned type wherein the cutter member is supported at one end thereof, and is driven, in a novel and expeditious manner.

Yet another object of my invention is to afford an attachment of the aforementioned type wherein the cutter member is supported by, and removable with, a removable side wall of the attachment in a novel and expeditious manner.

Other and further objects of the present invention will be apparent from the following description and claims and are illustrated in the accompanying drawings which, by way of illustration, show a preferred embodiment of the present invention and the principles thereof and what I now consider to be the best mode in which I have contemplated applying these principles. Other embodiments of the invention embodying the same or equivalent principles may be used and structural changes may be made as novel which desired by those skilled in the art without departing from the present invention and the purview of the appended claims.

In the drawings:

Fig. 1 is a perspective view of an attachment embodying the principles of my invention, and showing the attachment operatively mounted on a hand drill;

Fig. 2 is a longitudinal sectional view of the attachment shown in Fig. 1;

Fig. 3 is a sectional view taken substantially along the line 33 in Fig. 2;

Fig. 4 is a detail front elevational view of a portion of the attachment shown in Fig. 2;

. Fig. 5 is a detail side elevational view of the device shown in Fig. 4;

Fig. 6 is a detail sectional view taken substantially along the line 66 in Fig. 2; and

Fig. 7 is a detail sectional view taken substantially along the line 7-7 in Fig. 2.

A cutter attachment for hand drills, and the like, is shown in the accompanying drawings to illustrate a preferred embodiment of my invention. The attachment 20 comprises, in general, a cutter mechanism C reciprocably mounted in a housing H and operatively connected to a drive mechanism M mounted in the housing H and projecting therefrom for connection to a suitable power unit, such as a hand drill D.

The cutter mechanism C is shown in the accompanying drawings as embodying a saw blade 22. However, it will be understood that other suitable types of cutter mechanism such as, for example, files and knives may be substituted therefor without departing from the purview of my invention.

The housing H comprises a top wall 24, two end walls and 26, two side walls 27 and 28 and a bottom wall 29. The top wall 24, end walls 25 and 26, and side walls 27 and 28 are preferably formed as a single unit to afford a substantially inverted cup-shaped body member 31 for the housing H. The body member 31 is preferably made of suitable material such as cast aluminum.

A boss 33 projects inwardly from the inner face of the end wall 25 of the housing H and has a downwardly extending partition wall 34 projecting from the inner end portion thereof. Two holes 36 and 37, Fig. 7, are tapped in enlarged sections of one end portion of the side walls 27 and 28, respectively, adjacent the end wall 26, which end of the attachment 20 will hereinafter be referred to as the front end, the other end, which includes the end wall 25, being referred to as the rear end. Two other holes 39 and 40 are tapped in the side walls 27 and 28 toward the rear of the housing H adjacent the junction of the side walls 27 and 28 with from the end Wall 25, Figs. 2 and 3.

The bottom wall 29 of the housing H has an elongated boss 42 projecting upwardly from the rear end portion of the upper face thereof in position to abut the lower edge of the partition wall 34 when the bottom wall 29 is disposed in normal closed position on the body member 31, Fig. 2. The bottom wall 29 of the housing H is releasably attached to the body member 31 by four screws 43 which extend through the bottom wall 29 and are threadedly engaged in the openings 36, 37, 39 and 40.

A substantially cylindrical shaped boss or offset portion 44 is formed on the forward end portion of the bottom wall 29 and projects upwardly therefrom and is disposed in a recess 45 formed in the front face of the front wall 26 of the housing H. A substantially cylindrical shaped opening 47 is formed in and extends through the boss 44 in alignment with a downwardly opening arcuateshaped opening 49 formed in the front wall 26 of the mounted in the housing H with the shank 53 disposed in alignment with the openings 47 and 49; The rear end portion of the shank 53 is slidably mounted on the upper face of the abutment member 34 on the bottom wall 29 of the housing H, and extends .rearwardly through a .slot 55 formed in the partition wall 34. Abushing 57, Fig. 2, is mounted in the opening 47 in the boss 44 on the bottom wall 29 and is held in position therein by a set screw 59. A piston 61, which forms the connecting member of my novel attachment 20" by means of which the cutter members, such as a saw blade 62, Figs. 1 and 2, may be removably connected to the slide 51 for reciprocation thereby, is reciprocably mounted in the bushing 57. The front end portion of the shank 53 of the slide 51 extends into, and is welded to, the piston 61, the piston 61 being disposed in the bushing 57 in alignment with the shank 53 of the slide 51 whereby the slide 51, upon reciprocation longitudinally in the housing H, is effective to move the piston 61 inwardly and outwardly in the bushing 57.

A downwardly opening slot 63 is formed in the front ,end portion of the piston 61 and extends rearwardly along the center line thereof.

The slot 63 is of proper size and shape to receive the butt or rear end portion of the saw blade 62, and the latter is mounted therein with the front end portion of the blade 62 projecting forwardly from the piston 61 and outwardly through the opening 47 in the bottom wall 29, and with the upper edge of the rear end portion of the blade 62 clamped in abutting engagement with the closed-end wall 63a of the slot 63' by a set-screw 64 threaded into the lower portion of the piston 63 and and engaged with the lower edge of the blade 62. The set-screw 64 is of the straightshanked type, as best seen in Fig. 2, and when disposed in normal clamping position relative to the blade 62 is embedded in the piston 61 so that no portion thereof 7 projects from the piston 61. While I have shown a saw blade 62 mounted in the piston 61 to illustrate the principles of my invention, it will be understood by those skilled in the .art that this is by way of illustration only and that other suitable cutter members such as files and knives may be substituted therefor without departing from the purview of my invention.

A guard member 81, Figs. 2, 4, and 5 having a substantially cup-shaped body member 82 and a U-shaped abutment member. 83 welded thereto is removably mounted. on the free end portion of the boss 44 on the bottom wall 29'of the housing H. The cup-shaped body.

portion 82 of the guard 81 is of such a size as ,to fit relatively snugly on the boss 44, but is sufliciently loose thereon that it may be readily mounted on and removed from the boss 44 by hand. A cylindrical Shaped opening 85 is formedin the closed end portion of the body member 82 of the guard 81 and the abutment member :83 has a slot 87 formed in one leg 83a thereof. The

free end portion of the other leg 83b of the abutment member 83 is welded .to the outer peripheral surface of the body member 82 of the guard 81 in position whereby the leg 83a extends upwardly past the closed end of the body member 82 with the slot 87 disposed in alignment with the opening 85. The opening 85 and the slot 87 are of such size that the cutter member such as the saw blade 22, when it is disposed in operative position in the piston 61, may extend through the opening 85 and the abutment member 87, and the .guard 91 maybe mounted on and removed from the boss 44 by moving the guard 81 onto and off from the free endv portion of the saw blade 22.

The drive mechanism M, for reciprocating the slide 51 ,and, thereby, the cutter member 62, includes .a bevel' gear 91, Fig. 2, mounted on the lower .end portion of a shaft 92 which is journaled in a boss 94 projecting down wardly from the central portion of the inner face vof the top wall 24 of .the housing H. A pin 96 is mounted in 'thefbevel gear 91 and projects from the lower face iii) thereof into an elongated slot 97 formed in, and extending longitudinally of, the cross bar 54 of the slide 51.

A roller 99 is journaled on the lower end portion of the pin 96 and is disposed in the slot 97 in engagement with both longitudinal sides of the slot 97. The slot 97 is of such length and is so disposed in the cross bar 54 that upon rotation of the gear 91 with the shaft 92, the roller 99 may reciprocate in the slot 97 and is thereby effective to move the slide 51 and the piston 61 longitudinally inwardly and outwardly relative to the openings 47 and 49, and thereby longitudinally reciprocate the cutter member 62 attached to the piston 61.

The bevel gear 91 has teeth 101 formed on the upper peripheral edge portion thereof which are engaged with teeth 102 on the bevel gear 103 which is mounted on and secured to a shaft 105 journaled in a bushing 106 mounted in and extending through the boss 33 on the end Wall 25 of the housing H. The shaft 105 projects outwardly from the housing H and terminates in its outer end portion in an enlarged head 108 having a tapped opening 109 formed in the free end portion thereof for reception of, and threaded engagement with, the stud 112 of a suitable adapter or, coupling member 114. The

coupling member 114 has a shaft 116 projecting from the end opposite the stud 112, the shaft 116 being operatively engageable in a chuck 118 of the drill D for connecting the shaft 105 to the drill D. for rotation thereby. The coupling member 114 is readily removable from the shaft 105, and it will be appreciated by those skilled in the art, that other coupling members may be used in place thereof without departing from the purview of my invention.

' handle 121 and is threadedly engaged in the side wall 28.

In the operation of my novel attachment 20 a coupling member 114 of the proper size and shape may be screwed into the head 108 of theshaft 105. With the coupling member 114 so connected to the shaft 105, it will be seen that the power unit or drill D may be readily, operatively connected to the shaft 105 by engaging the.

chuck 118 with the shaft 1169f the coupling member 114. The .operator may then grasp the handle 121 on the attachment 20 with one hand, and the handle .125 of the drill D in the other hand, and by controlling the control switch of the drill D, such as, the trigger 127 thereof, Fig. l, the shaft 105 may be driven by the drill D to thereby rotate the gears ,103 and .91, and cause the slide 51 to reciprocate inwardly and outwardly I lative to the end wall 26 to correspondingly reciprocate the piston 61 and the cutter member 62.

In applying the cutter member 62 to a workpiece to be operated upon, the attachment 20 may, if desired, be held entirely by hand such relation to the work-piece that the housing H is held stationary with respect to the work-piece and with the cutting edge of the cutter member 62 disposed in the desired cutting engagement with work-piece; 'However, there are various other ways in which the attachment 20 may be sup-.

ported in operative position relative to the work-piece.

Thus, for example, if desired the workpiece may be blocked or clamped in proper position on a supporting member such as a work table or work bench, not shown, and the attachment 20 may be manually held in cutting relation thereto with the abutment member 83 rest? piece, and with the front face of the guard 81 disposed in abutting relation to the work-piece. It will beseen that, in all instances, the work-piece and'the housing H are normally preferably held in stationary position relative to each other, with the cutting stroke of the cutter member 62 afforded by the reciprocating thereof in the housing H.

From the foregoing it will be seen that I have afforded a novel attachment for hand drills and the like, wherein a cutter member may be reciprocated by the hand drill in a novel and expeditious manner.

Also, it will be seen that I have atfordcd a novel attachment wherein a cutter member may be quickly and easily operatively connected to a slide member.

in addition, it will be seen that I have afforded a novel attachment of the aforementioned type wherein the slide thereof is mounted on, supported by, and removable with a removable side wall of the attachment in a novel and expeditious manner.

Thus, while I have illustrated and described the preferred embodiment of my invention, it is to be understood that this is capable of variation and modification, and I therefore do not wish to be limited to the precise details set forth, but desire to avail myself of such changes and alterations as fall within the purview of the following claims.

I claim:

1. In an attachment for hand drills and the like for driving a reciprocatory hand tool member, an elongated housing including a removable bottom wall having a portion projecting outwardly from said housing, rotatable drive means mounted in said housing and including a coupling member for operatively connecting said means to such a drill for rotation by the latter, a slide operatively connected to said drive means and movably mounted in said housing in alignment with said portion of said bottom wall for reciprocation by said drive means inwardly and outwardly relative to said housing during such rotation of said drive means, means including said outwardly projecting portion of said bottom wall for supporting such a hand tool member, and means slidably mounted in said portion for operatively connecting said hand tool member to said slide for reciprocation by the latter relative to said housing and to said portion of said bottom wall upon said reciprocation of said slide by said drive means.

2. An attachment for hand drills and the like for driving a reciprocatory cutting member, said attachment comprising a housing including an end wall, an intermediate partition wall, and a removable bottom wall, said bottom wall having a laterally projecting portion disposed adjacent to and in parallel relation to said end wall, a slide reciprocably mounted in said partition wall and extending outwardly through said end wall and said portion of said bottom wall for reciprocation through said end wall and said portion of said bottom wall into and out of said housing, rotatable means mounted in said housing and operatively connected to said slide for reciprocating the latter upon rotation of said means, said rotatable means including a coupling member projecting from said housing for operatively connecting said means to such a hand drill for rotation by the latter, and means for connecting said slide to such a cutting memher.

3. An attachment for hand drills and the like for driving a reciprocatory cutting member, said attachment comprising a housing comprising a substantially cupshaped body member having an open bottom, and a bottom wall removably mounted on said body member in closing relation to said open bottom, said body member including an end wall and an intermediate partition wall, said end wall having an arcuate-shaped opening therein, said bottom wall having a laterally projecting end portion having an opening extending therethrough, said end portion being disposed adjacent to said end wall with said last mentioned opening disposed in alignment with said arcuate-shaped opening, a slide reciprocably mounted in said partition wall in engagement with said bottom wall and extending toward said openings for reciprocation inwardly and outwardly relative thereto, rotatable means mounted in said housing and operatively connected to said slide for reciprocating the latter upon rotation of said means, said rotatable means including a coupling member rotatably mounted on said housing for operatively connecting said means to such a hand drill for rotation by the latter, and a connecting member reciprocably mounted in said opening in said bottom wall and operatively connected to said slide for reciprocation with the latter for connecting said slide to such a cutting member, said slide and said connecting member being freely removable with said bottom wall from said body member.

4. In an attachment for hand-drills and the like for driving a reciprocatory elongated cutter member, an elongated housing having a top wall, two oppositely disposed side walls, two oppositely disposed end walls, and a removable bottom wall, said bottom wall having an end portion projecting outwardly from said housing, one of said end walls having an opening therein, an elongated slide slidably mounted on said bottom wall and projecting outwardly through said opening in said one end wall for longitudinal reciprocation into and out of said housing through said opening, one portion of said slide being disposed in said housing at all times during such reciprocation of said slide, drive means rotatably mounted in said housing and operatively connected to said slide for reciprocating said slide upon rotation of said drive means, said drive means including a coupling member projecting from said housing for operatively connecting said drive means to such a drill for rotation thereby, said end portion of said bottom wall having an opening extending therethrough substantially in alignment with said opening in said one end wall, and a bearing member mounted on one end of said slide for reciprocation therewith and slidably mounted in said opening in said bottom wall for reciprocation in the latter, said bearing member having a slot therein for supportingly receiving an end portion of such an elongated cutter member for supporting said cutter member on said end portion of said bottom wall in substantially longitudinal alignment with said one portion of said slide for reciprocation with said slide relative to said end portion of said bottom wall.

References Cited in the file of this patent UNITED STATES PATENTS 1,441,132 Tabor Jan. 2, 1923 1,481,055 Fullbright Jan. 15, 1924 2,143,981 Harding Jan. 17, 1939 2,307,174 Wachs Ian. 5, 1943 2,337,769 Redenbo Dec. 28, 1943 2,484,158 Elser Oct. 11, 1949 2,541,716 Oster Feb. 13, 1951 2,621,685 Butz Dec. 16, 1952 FOREIGN PATENTS 100,137 Sweden Oct. 29, 1940 933,625 France Apr. 27, 1948

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3212250 *Jun 26, 1964Oct 19, 1965William E AnlabaughTree limb shaker attachment for chain saws
US3677313 *Jan 22, 1970Jul 18, 1972Alva James Rudkin JrPower hand saw
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US4976164 *Nov 14, 1988Dec 11, 1990Black & Decker Inc.Thrust bearing arrangement for a power tool transmission
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US7913403 *May 23, 2007Mar 29, 2011Peter Douglas WillettsReciprocating pruning saw
US8191268 *Feb 28, 2011Jun 5, 2012Peter Douglas WillettsReciprocating pruning saw
US8813377 *Apr 11, 2011Aug 26, 2014Makita CorporationReciprocating cutting tools
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US20110154671 *Feb 28, 2011Jun 30, 2011Peter Douglas WillettsReciprocating pruning saw
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Classifications
U.S. Classification74/50, 30/392
International ClassificationB23D49/16, B23D49/00, B23D57/00
Cooperative ClassificationB23D57/0076, B23D49/162
European ClassificationB23D49/16B, B23D57/00F