US3060440A - Fastener driving tools - Google Patents

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Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
  • B25C1/00—Hand-held nailing tools; Nail feeding devices
  • B25C1/02—Hand-held nailing tools; Nail feeding devices operated by manual power

Definitions

• this type of tool generally comprises a tubular housing containing an axially-movable plunger or elongate anvil.
• the head of the fastener is guided within the bore of the housing, whereas the front of the housing is provided with supplemental guide means cooperable with the shank of the fastener.
• the principal problem with such a device occurs in connection with the front guide means, which should have a relatively close guiding cooperation with the shank of the fastener yet be adapted to pass the relatively enlarged head after the fastener is driven.
• the front guide prevents the head of the fastener from being driven down against the work, it then being necessary to complete the driving operation with a finishing punch after removal of the driving tool.
• the front guides In those cases where the head is driven against the work by the tool, the front guides must be transversely yieldable (so as to clear a path for the head), and for that reason may not provide sufficient guiding support. Accordingly, it is an object of the present invention to provide an improved tool whereby a headed fastener is precisely guided throughout the driving operation by a non-yielding front guide, which does not interfere with completion of the driving operation.
• the provision of a tool wherein the fastener may be driven to varying controlled depths; the provision of a tool adapted for use with threaded or other types of fasteners; the provision of a tool that applies compressive force to the work about the fastener while the fastener is driven, this being useful in certain applications, such as driving in plaster or concrete; the provision of a fastener and tool especially useful when it is necessary to drive an extra long or narrow fastener in materials likely to cause the fastener to buckle; the provision of a fastener and driving tool for use when the fastener is partially started; and the provision of a structure to be fastened with penetrating fasteners.
• the tool comprises a tubular housing having a front platen shaped to engage the work into which the fastener is driven.
• An elongate driver projects rearwardly from the housing, the driver being guided for axial movement from a retracted position to an advanced position wherein the front end of the driver is adjacent the front of the housing.
• the front of the tool is formed with an opening of sufficient size to admit both the shank and the head of the fastener, the head being guided by the driver or within a guide tube.
• the shank portion of the fastener is then guided by one or more apertured guiding elements releasabley held in the front or center of the tool.
• Each guiding element may be and preferably is of an outer dimension greater than the fastener head but the inner opening should have a frictional press t with the shank of the fastener.
• the fastener and associated guiding element are then supplied to the user in assembly, the guiding element being seated on the shank well forward the head.
• This guiding element is to be distinguished from a conventional Washer in that it is a rigid non-yielding member that will positively prevent relative displacement of the fastener in the lateral direction and resist but permit relative movement in the axial direction.
• the outer dimension of the guiding element otherwise depends upon the character of the tool.
• the tool is constituted by a housing and a one-piece driver, the bore of the housing having a telescoping cooperation with the guiding element assembled on the fastener.
• the driver is recessed to ⁇ hold the head of the fastener. Accordingly, the shank is supported and guided at its head and by the guiding element Within the bore while the driver is driven forwardly.
• a main driver section there is a main driver section, a removable driver extension or drive rod, and a removable front guide tube all contained in a housing.
• the driver extension and front guide tube may be replaceable so as to accommodate fasteners of varying shape and size, and the bore within the guide tube has a close sliding cooperation with the head of the fastener.
• the front portion of the guide tube may then be counterbored or otherwise shaped to receive and hold the guiding element.
• the front of the guide tube might be axially slotted and magnetized, or might be axially slotted and formed with a rearwardly-convergent counterbore, which develops a spring-wediging cooperation with the periphery of the guiding element.
• the guiding element has the function of the front-guide means in prior nail-driving devices, it has other advantages also. Where the guiding element is disposed in substantial spaced relationship from both the penetrating end and the head of the fastener, the shank is less likely to bend or buckle. Indeed, several such guiding elements may be disposed in spaced relationship along the shank of an extra long or narrow fastener so that the fastener can be driven without risk of buckling. Furthermore, the fastener combination has particular utility in partial assemblies. For example, a strip to be nailed may have several penetrating fasteners in part imbedded at predetermined points and angles. This strip is then placed against a second member to which it is to be attached and the fasteners are driven home.
• the fastener When utilizing this invention, the fastener would be provided with guide elements disposed forwardly of their heads, so that a tool of the type disclosed can be utilized to insure that the fastener will be driven at the predetermined angles without damage to the strip or buckling of the fastener.
• FIG. 1 is an oblique view, parts being broken away to illustrate a first embodiment of the invention
• FIG. 2 is a longitudinal section of the tool shown in FIG. 1;
• FIG. 3 is a View similar to that of FIG. 2, but showing an alternative embodiment of the invention
• FIG. 4 is a cross section taken on the line 4--4 of FIG. 3;
• FIG. 5 is a view similar to that of FIG. 3 showing the driver in its retracted position
• FIG. 6 is a view similar to that of FIG. 3 showing a different driver extension and guide tube, such as would be used with a fastener or different size;
• FIG. 7 is a detail view illustrating an alternative manner of holding the guide element of the fastener
• FIG. 8 is a sectional view showing another embodiment of the invention.
• FIG. 9 is a section taken on line 9-9 of FIG. 7.
• a tubular housing 1 having a rear guard 3 and a forward platen 5.
• the guard 3 may be a collar threaded or otherwise secured to the housing, whereas the platen 5 is press fitted over ⁇ a tubular cap 7, which forms a 4tube extension reaching from the front of the housing to the surface of the work W, flush with the projecting tip of the fastener nose 27.
• the cap slides over and is secured detachably to the housing by means of a screw 9. This cap is then formed with an opening 11 concentric with and of the same diameter as the bore 13 of the housing.
• the platen opening as shown at 311 may be of larger diameter than the fastener receiving bore and that the modified platen 105 is positioned with the aid of a tubular portion of the device extending rearwardly.
• the housing opens rearwardly and contains an elongate driver 15, the rear portion of which projects from the housing and may be provided with a cap 17.
• the front portion of the drive rod is counterbored at 21 so as to hold the head 23 of a fastener F, the head being smaller than the bore 13.
• This head is necessarily larger than the main shank 25 of the fastener, and the front of the shank is provided with a penetrating nose 27.
• the head of the fastener is thus guided by the counterbored end portion 21 of the drive rod, whereas the shank of the fastener is guided by washer-like elements 19 and 29 fitted over the shank and vslidably received within the bore 13.
• the center openings or apertures 31 -in the guiding elements 19 and 29 initially are slightly smaller than the shank of the fastener, so as to have a tight fit with the shank portion 25. It will be understood that the fastener would be initially delivered by the manufacturer with one or more guiding elements press fitted over the shank, the fit being such that ⁇ it would be impractical for the user of the tool to do this.
• washer-like guiding elements are further adapted to prevent buckling of the shank, should difiiculty be encountered in driving the fastener.
• the washers are designed to prevent any lateral displacement of the shank relative to the washer while permitting an axial displacement under the forces applied to the driver, as by a hammer. Consequently, washers formed of lead or soft plastic are not satisfactory, whereas steel washers would be satisfactory.
• the number and spacing of the guiding elements required will be determined by the character of the shank. If the shank is relatively short and strong, only one element adjacent the front may be sufficient, but if the fastener is unusually long or narrow, several such guiding elements will be desirable, as indicated in FIG. 2.
• the number and disposition of guiding elements will also be determined in some measure by the character of the work. For example, oak or metal structures offer considerable resistance to penetration.
• the maximum anti-buckling effect is achieved when the washer is disposed half way between the ends of the shank, although it may be desirable to move the washer forwardly somewhat in order to provide more positive guiding action during initial penetration of the work. In most instances, however, the guiding element will be spaced somewhat rearwardly from the tapering nose 27 in order to have a press fit with the shank.
• the driver of the tool is movable to a predetermined retracted position.
• the driver may be formed with a longitudinal groove 33, and the housing may be provided with a cap screw 35, the tip 37 of which seats within the groove 33.
• the front portion of the driver In its retracted position, as determined by engagement of the screw 35 with the front 39 of the groove, the front portion of the driver would be positioned back from the front of the housing a predetermined distance corresponding to the length of the fastener.
• engagement of the fastener head 23 within the counterbore 21 limits rearward movement so that all guide elements are received within the barrel 13.
• the tool In operation, the tool is brought to bear against the work W so that the platen 5 is pressed against the work surface.
• the tapered nose of the fastener may be slightly pressed into the work or may be flush with the front of the platen, as illustrated.
• the fastener is then driven Iby striking the driver cap 17, as with a conventional hammer.
• the nose of the fastener As the anvil moves forwardly, the nose of the fastener is driven into the work W and the first retaining element is moved against the work surface.
• a frictional gripping effect is developed so that the guiding element is held in tight compressive relationship with respect to the work surface.
• a preferred second embodiment of the invention is ⁇ shown to comprise a tubular housing having ⁇ a rear hand guard 103 and a front platen somewhat similar to those described heretofore. It may be noted that both the hand guard 103 and platen 105 may be eccentric with respect to the tubular housing 101 so as to permit the tool to drive a fastener along side a projecting portion of the work.
• the housing is formed from an outer tube of rubber forming a hand grip and a metallic inner tube 102, to which the elements 103 and 105 are attached by any suitable means.
• a retainer spring 104 extends between the two sections of the housing, and this spring is provided with a detent 106 at its forward end. The retainer spring 104 is thereby sandwiched between the inner and outer tubes of the housing and releasably holds the two members in assembled relationship, there being an opening 108 in the inner tube cooperable with the detent 106 of the spring.
• any elastomer equivalent to rubber of suitable resilience for the purpose is contemplated for the outer tubular hand grip part of the housing and that by rubber is meant a vulcanized elastomer having stretch and snapback characteristics distinguishable from hard inelastic material (see Special Technical Publication No. 184, Committee D-20 on Plastics, of the Society for Testing Materials).
• the driver or driving plunger, is also of a two-piece construction, there being a back section telescoping within the inner ⁇ tube 102.
• a head 117 is provided on the rearwardly projecting portion of the driver, whereas the front end of section 115 is bored to accommodate a driver extension or drive rod 116.
• the rear portion of the driver extension seats within the tubular front of section 115 and is locked therein by means of a ball 118 seating within a peripheral groove 120.
• the driver is movable between advanced and retracted positions.
• a peripheral groove 122 is formed adjacent the tubular front of the back driver section 115 for cooperation with a rear detent 110 of the retainer spring 104, which projects through a corresponding opening in the inner tube to press against the outer cylindrical surface of the driver, thereby to releasably hold the driver in its retracted position.
• the forward end 119 of the driver extension 116 or 216 is disposed adjacent the front platen 105, but the extension moves rearwardly to accommodate a fastener, as shown in FIGS. 5 and 6.
• the head 123 of the fastener is then guided within a removable guide tube 121, which is releasably held within the front portion of the housing.
• the guide tube 121 may have peripheral grooves 135 cooperable with the spring detent 106.
• the guide tube projects t from the front of the housing so that it can be gripped land pulled entirely from the housing against the resistance of the detent, this being desirable in order to permit replacement of the guide tube.
• the inner bore of the guide tube necessarily must vary, as shown at 113 and 213, with the diameter of the fastener head 123, hence the need for a replaceable guide tube where several different types of fasteners are to be driven.
• the driver extension 116 it will also be desirable to change the driver extension 116 to a corresponding diameter. Even when there is no change in the diameter of the extension, it may be desirable to change i-ts length, in order to vary the depth of penetration. For example, FIG.
• FIG. 6 ⁇ illustrates how a somewhat shorter drive rod 216 would be used in driving a fastener where a substantial portion of the fastener is to project from the work, as is the case with a threaded stud.
• FIG. 6 ⁇ also illustrates a somewhat larger bore 213 and corresponding increase in the diameter of the driver extension 216.
• the guide tube 121 may be moved to a retracted position wherein the detent 106 releasably engages within the front groove 135.
• the fastener assembly includes a washer-like guiding element 129, as before, and in this embodiment, the guiding element is held in a counterbore 111 formed at the front of the guide tube rather than in the main bore 113. Normally, the guiding element will be set back somewhat from the front end of the fastener, and in order to hold the end of the fastener ush with the front f of the tool, the guide tube should be retracted, as illustrated in FIG. 5.
• the fastener assembly is then held within the tool ⁇ by the guiding element.
• the forward end of the guide tube may be slotted at 140 along opposite sides and then magnetized so as to achieve a horseshoe magnet effect.
• the surrounding portions of the housing be non-magnetic, so as not to bypass the magnetic field around the guiding element.
• the tube may be slotted at 140 and the front counterbore 211 formed with a rearwardly convergent peripheral wall. With this arrangement, a wedging effect is achieved, the slots 140 serving to provide a spring bias for frictionally holding the washer within the tapering counterbore.
• the guiding element need not have a press fit with the shank 12S, if such is not desired, in the absence of a tight frictional fit, the washer will be held in the counterbore until engaged by the head 123; At that time, the front of the back section 115 engages the back of the guide tube so that the fastener and guide tube move forwardly together to complete the driving operation.
• the initial blow may tend to move the washer from within the counterbore forwardly against the surface of the work, as the point of the fastener penetrates the work.
• the guiding element is primarily a centering device for insuring accurate alignment of the fastener shank preparatory to initial penetration.
• An anti-buckling action would be achieved, however, if the guiding element remained in the counterbore 111 as the fastener penetrated the work.
• the guide tube 121 may initially so grip the retaining element that the entire tube will move forwardly against the resistance of the spring detent 106 during the initial penetration of the fastener.
• FIG. 8 illustrates a further application of the invention.
• this item is a laminated section of outer facings 205 secured to an inner wood core 207 with relatively small angled fasteners 209 in part projecting from one face.
• the assembly is then attached by the fastener 203, which is partly imbedded in that face.
• a strip might be used in laying wall to wall carpeting on a concrete floor, the item 201 being a strip secured to the tioor by the fastener 203 and the rug being held by the angled points of fasteners 209.
• This fastener 203 has a head 223 and a shank 22S, the front or nose portion 227 of the fastener being imbedded.
• a guiding element 219 of the type described previously is temporarily secured over the shank part way between the head 223 and the work 201.
• a fastener driving tool of the general type described previously may be utilized to drive the fastener 203, the tool being aligned by telescoping cooperation with the head 223 and guiding element 219.
• one or more fasteners may be pre-set at particular locations or angles to facilitate field operations, the guiding element insuring that the fastener is ultimately driven at the proper angle.
• a hammer actuated tool for driving a fastener by hand into concrete, steel or the like comprising a hollow holder, an outer circumferential portion of which consists of a material adapted to be grasped in one hand, ⁇ an elongated fastener guiding element mounted at the front portion of said holder and having a bore for receiving said fastener, means at the front portion of said holder to retain said element relative to said holder in predetermined operable position, an elongated driving plunger slidably arranged within the rear portion of said holder and projecting rearwardly therefrom and having a separate drive rod coupled thereto and extending forwardly into said bore to engage said fastener emp-laced in said bore, said tool including yieldable means extending in said holder to retain said plunger in operable position with respect to said holder.
• said yieldable retaining means includes a resilient member at least part of which disposed between said circumferential portion and plunger is urged to press against said plunger adjacent the rear portion of said housing.
• said yieldable retaining means includes a resilient member, a part of which is urged to press against said plunger, and a circumferential groove in said plunger Ifor receiving said part of said member.
• the tool of claim l including a laterally extending hand guard portion fixed at the rear end of said holder.
• connection comprises a circumferential groove on one of said plunger and rod and a member slidably mounted on the other in a radial passageway for extension into said groove.
• a hammer actuated tool for hand driving into concrete, steel or the like a headed and pointed penetrating fastener having an elongated relatively slender shank terminating in an enlarged head of predetermined dimensions at the rear end and a tapering nose at the other end and with at least one washer slidably carried in presstted relationship on said fastener to gird said shank during driving rearwardly of the nose and forwardly of the head, said washer being of such rigidity and location as to prevent ⁇ buckling of said shank during driving, said tool comprising a tubular housing adapted to be hand held, an inner guide barrel at least most of which is adapted to be slidably telescoped within the front portion of the housing ⁇ for replaceable reception therein, an elongate driver received in telescoped slidable relationship for replaceable reception within the rear portion of the housing with a hammer impact receiving end projecting therefrom, said guide barrel having an axial bore of a size corresponding to said predetermined dimensions for receiving said fastener head in closely
• a hammer-actuated fastener driving tool for hand driving into concrete, steel or the like penetrating fasteners having an elongated relatively slender shank terminating in an enlarged head at the rear end and a tapering nose at the other end and at least one washer slidably girding said shank in press-fitted relationship rearwardly of the nose -and forwardly of the head, said fastener assembly including a washer adjacent said nose of said shank, said tool comprising a hollow open-ended holder adapted to be grasped in one hand, a replaceable fastener guiding element received within the forward portion of said holder, said guiding element having a bore for receiving a fastener, and a counterbore at the front end of said bore adapted to receive the foremost washer in laterally engaged forwardly releasable held relationship, a plunger telescoped slidably within the rear portion of said holder and projecting rearwardly therefrom ⁇ for receiving hammer impact, means for releasably
• a hammer actuated tool for driving by hand into concrete, steel or the like surface a penetrating fastener having an elongated shank formed with a point at one end thereof and an enlarged head at the other end thereof and a washer press tted over the shank in spaced relationship from the ends thereof, said washer being of an outer diameter substantially greater than any other portion of the fastener and being formed of a material of sufficient rigidity so as to be adapted to substantially prevent lateral displacement of the shank relative to the washer, said driving tool having a holder formed with an elongate open-ended fastener guiding bore for admitting the fastener and washer thereon with a close slidable fit with said head, a driving member slidably contained within said bore at the back portion thereof for driving the fastener, the front portion of the bore being shaped to hold the washer in forwardly movable rearwardly constrained laterally-fixed relationship with respect to the bore and with said fastener protruding forwardly of said washer and holder, said tool

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Portable Nailing Machines And Staplers (AREA)

Description

Priority Applications (6)

Applications Claiming Priority (1)

Publications (1)

Family

ID=24109980

Family Applications (1)

Country Status (6)

Cited By (32)

Families Citing this family (4)

Citations (24)

• 0
  • BE BE550406D patent/BE550406A/xx unknown
• 1955
  • 1955-08-19 US US529454A patent/US3060440A/en not_active Expired - Lifetime
• 1956
  • 1956-07-25 GB GB22975/56A patent/GB828317A/en not_active Expired
  • 1956-08-10 ES ES0230318A patent/ES230318A1/en not_active Expired
  • 1956-08-16 FR FR1160726D patent/FR1160726A/en not_active Expired
  • 1956-08-18 CH CH354731D patent/CH354731A/en unknown

Patent Citations (24)

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