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Publication numberUS3008361 A
Publication typeGrant
Publication dateNov 14, 1961
Filing dateOct 21, 1958
Priority dateOct 21, 1958
Publication numberUS 3008361 A, US 3008361A, US-A-3008361, US3008361 A, US3008361A
InventorsHenning Robert W
Original AssigneeOlin Mathieson
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Axial impact driving tool
US 3008361 A
Abstract  available in
Images(2)
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Claims  available in
Description  (OCR text may contain errors)

Nov. 14, 1961 R. w. HENNING AXIAL IMPACT DRIVING TOOL 2 Sheets-Sheet 1 Filed Oct. 21, 1958 IN V EN TOR. Roam? M HE/V/V/A/G B A TTORNEY Nov. 14, 1961 R. w. HENNING 3,008,361

AXIAL IMPACT DRIVING TOOL Filed Oct. 21, 1958 2 Sheets-Sheet 2 INVENTOR. ROBERT W. HENNING ATI'OK/YE Y Patented Nov. 14, 1961 Free 3,008,361 AXIAL IMPACT DRIVING TOOL Robert W. Henning, Fairview, Ohio, assignor to Olin Mathieson Chemical Corporation, East Alton, ill, a corporation of Virginia Filed (lot. 21, 1958, Ser. No. 768,717 7 Claims (Cl. 8152.35)

This invention relates in general to a hand tool for driving nails, pins, studs and the like and specifically for driving fasteners of special design for fastening into materials including concrete and steel particularly and for performing a combination of associated operations alternately with and related to driving of various sizes and shapes of fasteners.

The advantages of such a multi-purpose tool for various types of fasteners will be obvious not only to building construction workmen regularly employed in nailing into wood, concrete and metal in factories and homes, but also to the do-it-yourself handyman concerned at random occasions with many operations associated with installation of fasteners.

Therefore, the general object of this invention is to provide a hand tool of relatively simple construction characterized by durability of its operating parts as well as flexibility of its use wtih more than one type of fastener and of such tool size and shape as'to permit access of the tool into most places including even those of limited accessibility requiring such installations. Still another object is to provide a novel arrangement in a manually operable tool, which facilitates the rapid accomplishment of the tool operators tasks with improved control of penetration.

The type of tool heretofore used generally comprises some sort of a tubular housing and guide for doing no more than guiding and setting one kind of fastener in the bore of the guide for lateral support and also includes an axially movable plunger or anvil for driving the fastener while guided into the surface. The outer portion of the housing sometime includes a suitable handle to enable manual guidance with one hand as well as manual power application with the other with the aid of a hammer, or the like. A sturdy tool capable of doing more things associated with such driving and adapted for handling of more than one kind of fastener would be desirable; and such a tool is disclosed here.

In accordance with this invention, the objects are attained by the provision of a tool so shaped at the forward end as to present to the work a portion capable of fitting into a variety of places and having an arrangement and design of its parts for doing a variety of tasks in an adaptable manner with readily interchangeable working parts. The tool of this invention is primarily an impact too-l adapted for driving into work surfaces fasteners of various types and/or of various sizes by impact, but the tool is adaptable for applying torque as well. With a minimum of alteration, involving coupling with an auxiliary part, the tool is adapted to driving a screw fastener of a kind especially adapted for handling by means of application of both impact and torque through the tool. With a still further and minor change involving the same coupling, the tool is adapted to operate a star drill preparatory to installation of the screw fastener. The tool is especially adapted to setting screw fasteners of various types initially with impact into even the narrowest of quarters and finally driving these fasteners home together with rotation where necessary.

One feature of the tool lies in limiting the travel of the driver so as to allow application of thrust force to the fastener until it is driven to the desired extent and thereafter diverting the force to avoid overdriving of the fully driven fastener and injury to the force applying tip of the driver. In a preferred arrangement, the tip itself is a separate and replaceable part. Another feature of the tool resides in the size of the front end of the tool and the coupling means disposed there for mounting readily detachable tool attachments and which adapt the tool to transmit even high impact blows without impairing or interfering with the function of the coupling. Another feature lies in these various auxiliary parts, and particularly in a special auxiliary part forming another attachment which may be coupled to the front end of the device for adapting it to driving of fasteners of lesser diameter and/ or to driving them only partially impaled leaving the rear end of the fastener protruding to a desired standoff distance.

How these objects are attained will become more apparent from the description of the tool and its parts shown in the drawing in which:

FIG. 1 is a longitudinal cross sectional view of a preferred embodiment of the driving tool in side elevation with a preferred attachment for handling certain impact driveable fasteners;

FIG. 2 is a front end view taken on line II--II of FIGURE 1 with the auxiliary fastener attachment shown in FIGURE I removed to show the tool in condition without any such attachment ready for driving a still larger diametered fastener flush into the surface;

FIG. 3 is a side elevational view, partly in cross section, showing another auxiliary attachment adapting the tool for various purposes such as for receiving bits for making holes by drilling and for receiving a chuck, for driving different types of fasteners;

FIG. 4 is an exploded semi-perspeotive side elevational view of a self-tapping screw fastener together with a special chuck, partly in cross section, by which it may be positively driven according to this invention;

FIG. 5 is an enlarged fragrnentary and sectional view of the special thread coupling shown in FIGURE 1 to take all the various attachments;

FIG. 6 is an enlarged fragmentary view in cross section of a part of FIGURE 1 modified according to another embodiment;

FIGURE 7 is a side elevational view of the device shown in FIGURE 2;

FIGURE 8 is an end view taken on line VIII-VIII of FIGURE 7. 1

Basically, the tool comprises a resilient grip 9 of rubber, plastic or the like elastomeric material, a plunger 17 having a separable drive rod 18, a plunger and drive rod guide and holder member 10 with a special size nose 31 with threaded coupling means 30 for connecting various special attachments to the front end of the tool so as to extend its usefulness to the fullest.

Special fastener holder attachments shown are contempl-ated.

Grip 9 consists of an elastomer such as a'suitable rubber, polyurethane or polyethylene secured all along its bore 13 to the guiding and holder member 10 by adhesion or friction. Grip 9 is flared rearwardly and is tapered forwardly to a slender extension, which is formed with longitudinally extending ribs 8 as shown in FIGURE 2 and at the rear the grip is formed with an integral hand guard 11. Ribs 8 permit the grip to be grasped in an advantageous manner for applying atorque manually when desired. The guard 11 extends outwardly to protect the hand of the operator from any misdirected hammer blow and has flat sides 16 for giving a roll resisting moment as a result of the combined peripheral enlargement at 11 and the small number of sides shown to prevent rolling of the tool, when laid on its side. The grip 9 and guide member 10 thus form a housing; and a portion of grip 9 of the housing permanently extends inwardly opposite guard 11 (FIGS. 1 and 8) as a num- 9 a ber of protrusions 12 integrally molded with the grip in the form of circumferentially spaced fingers, or longitudinal serrations, rubbing on part of the cylindrical surface of the plunger for frictionally retaining the plunger 17 and its drive rod 18 at all times as part of the tool unless the plunger and rod are withdrawn at the will of the operator for cleaning or other maintenance purposes. Protrusions 12 drag on the cylindrical plunger surface '7 which is considerably enlarged as compared to the surfaces of the drive rod 18 from which surface 7 is spaced. This arrangement together with a suitable large number, or area, of protrusions makes possible the attainment of the proper degree of frictional gripping of the plunger independently of the operator but without interfering excessively with its driving movement.

The upper and exposed extension of the plunger 17 has an enlarged head 19 fastened thereto by a press fit with splines 21 so that the plunger may better receive blows and may better by manipulated by hand. Drive rod 18 in turn is secured in recess 23 of the plunger by splines 22. so

i that it may not only be detached and replaced, if necessary, but also to better withstand the shock of hammer ing without early fracture or loosening.

The assembled plunger unit is mounted in the steel barrel of the housing so that the plunger 17 is pretty nearly all receivable in the enlarged and elongated bore of the rear end extension of the guide member or tube 10 to get the piloting actionfound so necessary to proper driving of the fasteners Z, or the like, to penetrate into hard bodies such as 1, while rod 18, which forms an extension of the plunger, is slidably journalled in reduced bore 6 at the front end of the guide tube.

Between the bores 6 and 15 there is a load limiting shoulder which prevents excessive overdrive and penetration of the fastener when the effective rod length and the fastener lengths are properly proportioned. It is contemplated that for the most exacting installations, either the rod 18 is changed in length or, a predetermined length of the sleeve insert 5 (FEGURE 6) is slipped on it and positioned adjacent splined end 22 in any suitable way. Since only a few standard lengths of fasteners are employed only a few different lengths of drive rod and/or sleeves are needed. When plunger 17 bottoms onrshoulder 2t}, excessive impact is diverted from the fastener to the holder 10 and to the attachment 41 through the special threaded coupling, including threads and When used without attachments the tool is as shown in FIGURE 2 and is adapted for handling fasteners having at least a head, if not the whole shank, of the same diameter as the front bore 6, i.e., of the same diameter as the operative end 24 of the rod 18.

Mounted in the recess 14 at the guard end 11 is a specially toughened and hardened short length of pin 7 which serves with attachments either as a bit, chuck or fastener knock-out pin 25 or more importantly as a replaceable extension 25 for the rod 18 especially for coaction with the attachment 41, as shown in FIGURE 1. As best seen in FIGURE 2, the front end 31 of the tool free of any attachment is of smallest outer diameter and has a special coupling thread 3! as well as having a washer or disc receiving recess 27 and two opposing bevels 28 and 29 defining an included angle of about as shown in FIGURES 1, 2 and 7. These together with the small exterior diameter of about of an inch have been found to provide a combination adapted for use in the greatest, number of. installations ordinarily met, despite the greatest variety of jobs. This entire slender front end 31extends longitudinally at least 7 of an inch, but the very tip of this end extending back for a length of about of an inch has a still further reduced diameter of about /2 of an inch beveled at opposite sides to form an included angle of about 40 as shown at 28 and 29.

Bore 6 and rod 18 are of about inch diameter selected to fit this size of fastener found most useful.

For handling fasteners of lesser diameter than this size, such as fastener 2 of FIGURE 1, and especially those threaded at the rear end 3- and needing a fixed protrusion from work object 1, there is provided the barrel attachment 4-1 of FIGURE 1 forming another guiding and holding member for. such a fastener thereby providing a secondaly holder knurled at 42 for handling it for putting it on and taking it off.

Secondary holder or attachment 41 is shown as a circular cylindrical body having a large recess 43 at one end internally threaded at 49 to mate with the modified external threads 30 of the barrel for secure but detachable barrel mounting designed to carry the greatest stress applicable manually during pounding. At the opposite end is a smaller fastener receiving recess 44, acted on by a captive ball 47 mounted in cross bore 46 and biased therein by ball detent spring 48 to extend into the recess and thereby yieldably retain in it the fastener 2, while the other end of the ball spring is held by bore plug 49.

Between these end recesses is an intermediate and connecting longitudinal bore of substantially the same diameter as rod 18 and bore 6 for receiving the wear and breakage resistant driver end piece 25 or pin 25x, at least the former having an end recess for receiving the end of the smaller fastener 2 in alignment therewith. When secondary holder s1 is attached to barrel 10, the driver piece 25 is constrained to limited movement in bores 6 and 45 for. driving the fastener Z with controlled partial penetration to a predetermined distance.

This function of the tool is hard on piece 25 which eventually is battered at the recess 26 on account of the tolerances of fit and alignment with the end of the fastener and variation therewithin. Its replacement is made easy as disclosed and the flat-ended drive rod 18 is preserved.

Another attachment is the tapered chuck, or drill bit, or screw driver holder 51, FIGURE 3, knurled at 52, which, however, primarly functions to hold a special fastener driver adapter 56 which is tapered at one end to lit with a grip in tapered bore 54- of the holder from which it may be readily removed, if desired, by a drift pin pushed into side extractor hole 58. Holder 51, similarly to secondary holder 41, has an enlarged bore 53 internally threaded at St} to mate with coupling thread 30.

At the other end, adapter 56 has any suitable polygonal socket or recess 57 also tapered to fit with a similarly tapered polygonal, preferably five sided, driving tang 63 on the special self-penetrating fastener pointed at 61, self tapping sheet metal screw 3 having threads 62. The tapered tang 63 holds screw 60 in recess 57 until the driving is done. 0n impact applied by the plunger assembly,

point 61 accomplishes a penetrating puncture and on ap plication of torque threads 62 will drive screw 69 up to the hilt 64, whereupon the whole tool is pulled off the screw.

To permit all this interchangeability and variety of functions, there is provided a specially modified thrust carrying coarse threaded coupling of diminished thread form (see the enlargement of FIGURE 5) which will not lock up. Preferably the tooth forms 3t) and 4t and 50 is finely shaped such as that of a standard 20 to-the-inch V-type thread but the spacing is coarse such as that of a standard 11 to-the-inch thread as at 32. To make the male thread 30 the thread chaser of 11 tooth pitch is cut away partially at the crests, to leave only a thread protrusion of about 0.930 of an inch from about the pitch diameter at the resultant widened root. For making the female thread, an oversize hole of about pitch diameter is tapped as for a 11 tooth pitch, leaving an indentation of somewhat less than but adequate to take the male protrusion. Similarly modified standard threads of 12 and 14 to the inch are also suitable but the disclosed coarser modified /8 inch screw is preferred, for speed of assembly and disassenrbly, as well as for strength and ability to resist lock-up. In the /8 inch size found preferable, threads of 16 or more to the inch are too fine for modification in accordance with this invention. Regular coarse threads cut full depth should not be employed here because they will weaken the slender front end, Which is fixed in size both internally and externally, thereby providing a thin walled nose portion 31 small enough to adapt it for entry into tight quarters as in fastening at the bottom of shallow but narrow depressions.

It will be understood that those skilled in the art may make further changes and modifications without departing from the spirit and scope of this invention, which, therefore, should not be limited except as set forth in the appended claims.

What is claimed is:

1. An axial-impact tool for driving narrow elongated elements for accomplishing penetrative fastening into the surface of a work object comprising a hollow metal holder having a through bore axially thereof, said bore having a reduced diameter portion at the forward part of said holder and an enlarged diameter portion at the opposite part of said holder, said portions being connected by a rigid shoulder at a location intermediate said parts;

an elongated plunger slida-bly mounted for axial guidance in said enlarged diameter portion, said plunger being provided with means forming an impact-blow receiving rear end and being long enough relative to said shoulder location to maintain said rear end out of said bore even when said plunger is slid into said shoulder; said plunger including a reduced drive rod;

cooperating means on said plunger and rod for detachably connecting said rod to extend forwardly rom said plunger to a predetermined length adapted for slidable reception and axial guidance in said reduced diameter portion;

an outer casing of flexible material mounted on said holder whereby said casing extends outwardly from said holder adjacent said opposite holder part and forms thereat a hand grip wherefrom the front end of the forward part of said holder protrudes as a thin walled nose of lesser outer diameter;

a hardened metal impact-receiving end piece forming a separate rod extension movably mounted for impact reception at said front end of the tool between said rod and elements;

a hollow secondary holder member;

said nose being provided with male coupling means detachably mountin said member at said front end, said coupling means being of the quick assembly and disassembly type capable of taking said impact axially without either breaking or jamming against assembly and disassembly of said member;

said shoulder location and drive rod length extending from said plunger being related to limit the slidable plunger movement and slidable reception of said rod, whereby at least one of said holder and member, when the latter is mounted, guides said end piece and elements during driving and also takes said impact blow when said plunger is slid into said shoulder and whereby said plunger takes said impact blow to said elements.

2. The combination of claim 1 wherein the secondary holder member is an adapter for receiving elements of sizes and configurations diiferent from those of elements receivable in the reduced diameter portion of the holder; and wherein the coupling means is a special thread formation of fine external thread form axially separated to a course pitch by an intervening widened fiat root upraised to about course pitch diameter to extend outwardly from normal course root and adapted for engagement with a complementary thread formation on said member of fine internal thread form axially separated to a course pitch by an intervening widened flat crest depressed from normal course crest to about course pitch diameter for disposition spaced outwardly opposite said flat root.

3. The combination of claim 1 wherein the impact-receiving end piece has a configured,

recessed outer end for receiving and guiding the likeconfigured end of an element.

4. An axial-impact tool for driving narrow elongated elements foraccomplishing penetrative fastening into the surface of a work object comprising a hollow metal holder having a through bore axially thereof, said bore having a reduced diameter portion at the forward part of said holder and an enlarged diameter portion at the opposite part of said holder, said portions being connected by a rigid shoulder at a location intermediate said parts;

an elongated plunger slidably mounted for axial guidance in said enlarged diameter portion, said plunger being provided with means forming an impact-blow receiving rear end and being long enough relative to said shoulder location to maintain said rear end out of said bore even when said plunger is slid into said shoulder; said plunger including a reduced drive rod;

cooperating means on said plunger and rod for detachably connecting said rod to extend forwardly from said plunger to a predetermined length adapted for slidable reception and axial guidance in said reduced diameter portion;

an outer casing of flexible material mounted on said holder whereby said casing extends outwardly from said holder adjacent said opposite holder part and forms thereat a hand grip wherefrom the front end of the forward part of said holder protrudes: as a thin walled nose of lesser outer diameter;

said nose being provided with male coupling means for detachably mounting a hollow secondary holder member at said front end, said coupling means being of the quick assembly and disassembly type capable of taking said impact axially without either breaking or jamming against assembly and disassembly of said member, said coupling means consisting of a special thread formation of fine external thread form axially separated to a course pitch by an intervening widened flat root upraised to about said course pitch diameter to extend outwardly from normal course root and adapted for engagement with a complementary thread formation on said member of fine internal thread form axially separated to a course pitch by an intervening widened flat crest depressed from normal course crest to about said course pitch diameter, for disposition spaced outwardly opposite said flat root;

said shoulder location and drive rod length extending from said plunger being related to limit the slidable plunger movement and slidable reception of said rod, whereby at least one of said holder and member, when the latter is mounted, guides said elements during driving and also takes said impact blow when said plunger is slid into said shoulder, said holder guiding said elements during driving when said memher is detached, and whereby said plunger takes said impact blow to said elements.

5. The combination of claim 4 including a mounted hollow secondary holder member and wherein an integral partof the casing extends outwardly and forwardly to form alternately longitudinal ribs and grooves between the forward and opposite parts of the holder for adapting said member and the element to the application of torque manually, while an integral part of said casing extends rearwardly beyond said opposite part and inwardly between said opposite part and the impact blow receiving rear end to fully engage a fixed portion of the mounted plunger for continuous and uniform frictional retention of said plunger on the tool. 1 a

6. An axial-impact tool for driving narrow elongated elements for accomplishing penetrative'fastening into the surface of a work object comprising 1 a hollow metal holder having a trough bore axially thereof, said bore having a reduced'diameter portion at the forward part of said holder and an enlarged diameter portion at the opposite part of said holder,

said portions being connected by a rigid shoulder at a location intermediate said parts;

an elongated plunger slidably mounted for axial guidance in said enlarged diameter portion, said plunger being provided with means forming an'impact-blow receivingrear end and being long enough rel'ative to said shoulder location to maintain said rear end out of said bore even when said plunger is slid into said holder whereby said casing extends outwardly from.

said holder adjacent said opposite'holder part and forms thereat a hand grip wherefrom front end of V the forward part of said holder protrudes as a thin walled nose of lesser outer diameter, while an integral part of said casing extends rearwardly beyond I said opposite part and inwardly between said opposite part and impact blow receiving rear end to 1 fully engage a fixed portion of said mounted plunger for continuous and uniform frictional retention of a said plunger on said tool in mounted relation;

said nose being provided with male coupling means for detachahly mounting a hollow secondary holder member atvsaid front end, said coupling means being of the quick assembly and disassembly type capable of taking said impact axially without either breaking or jamming against assembly and disassembly of said member; a

said shoulder location and drive rod length extending from said plunger being related to limit slidable plunger movement and slidable reception of said rod, whereby at least one of said holder and member, when the latter is mounted, guides said elements during driving and also takes said impact blow when said plunger is slid into said shoulder, said holder guiding said elements during driving when said member is detached, and whereby said plunger takes said impact blow to said elements.

7. The combination of claim 4 wherein the thin walled nose is exteriorly beveled on two opposite sides to facilita-te its protrusion into narrow depressions at the surface of the work object and is interiorly recessed around the open front end of the bore at opposite sides intervening said two beveled sides for reception of washers, discs, and the like.

References Cited in the tile of this patent UNITED STATES PATENTS 1,458,961 Williams June 19, 1923 2,455,270 Ravella Nov. 30, 1948 2,602,360 Berninger July 8, 1952 2,787,178 Maxim Apr. 2, 1957 2,839,754 Pfafi June 24, 1958 FOREIGN PATENTS 924,131 France Mar. 3-, 1947 998,339 France Sept. 19, 1951

Patent Citations
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US1458961 *Mar 10, 1921Jun 19, 1923Williams Seldon TTool
US2455270 *Sep 19, 1945Nov 30, 1948Sarl Mermet & VirthnerAutomatic striking tool
US2602360 *Oct 11, 1949Jul 8, 1952Wilbur F StoverPercussion tool
US2787178 *Oct 25, 1955Apr 2, 1957George MaximAxially projectable impact tool
US2839754 *Mar 22, 1957Jun 24, 1958Pfaff Elmer FFastener driving tool
FR924131A * Title not available
FR998339A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4085882 *Feb 24, 1977Apr 25, 1978Robert StamperNailing tool
US4620657 *May 3, 1985Nov 4, 1986Flexible Steel Lacing CompanyDriver for riveting fasteners to a belt
US4688711 *Sep 9, 1985Aug 25, 1987Flexible Steel Lacing CompanyDriver for riveting fasteners to a belt
US5930899 *Jun 30, 1997Aug 3, 1999Snap-On Tools CompanyMolding and emblem removal tool
US6648203 *Aug 7, 2001Nov 18, 2003Steven Douglas LordTool for improving the decorative upholstery tacking process
US7520570 *Jul 25, 2005Apr 21, 2009Caterpillar Paving Products Inc.Tool extraction system for rotary cutter device
US20060022510 *Jul 25, 2005Feb 2, 2006Bitelli S.P.A.Tool extraction system for rotary cutter device
Classifications
U.S. Classification173/131, 227/147, 173/210
International ClassificationB25C1/02, B25C1/00
Cooperative ClassificationB25C1/02
European ClassificationB25C1/02