CA1130501A - Pneumatic tool - Google Patents
Pneumatic toolInfo
- Publication number
- CA1130501A CA1130501A CA318,217A CA318217A CA1130501A CA 1130501 A CA1130501 A CA 1130501A CA 318217 A CA318217 A CA 318217A CA 1130501 A CA1130501 A CA 1130501A
- Authority
- CA
- Canada
- Prior art keywords
- rack
- washers
- washer
- fastener
- opening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000007246 mechanism Effects 0.000 claims description 32
- 239000002184 metal Substances 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 230000005484 gravity Effects 0.000 claims description 9
- 230000003213 activating effect Effects 0.000 claims description 3
- 230000002452 interceptive effect Effects 0.000 claims 1
- 239000000789 fastener Substances 0.000 abstract description 2
- 210000002105 tongue Anatomy 0.000 description 10
- 238000009413 insulation Methods 0.000 description 9
- 229910001018 Cast iron Inorganic materials 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 6
- 230000000994 depressogenic effect Effects 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 230000036961 partial effect Effects 0.000 description 5
- 239000012190 activator Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 239000002360 explosive Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000002028 premature Effects 0.000 description 2
- 101100311260 Caenorhabditis elegans sti-1 gene Proteins 0.000 description 1
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 1
- 208000036366 Sensation of pressure Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000003138 coordinated effect Effects 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- BALXUFOVQVENIU-KXNXZCPBSA-N pseudoephedrine hydrochloride Chemical compound [H+].[Cl-].CN[C@@H](C)[C@@H](O)C1=CC=CC=C1 BALXUFOVQVENIU-KXNXZCPBSA-N 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
- B25H1/00—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby
- B25H1/0021—Stands, supports or guiding devices for positioning portable tools or for securing them to the work
- B25H1/0028—Tool balancers
-
- 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
- B25C1/001—Nail feeding devices
- B25C1/006—Nail feeding devices for corrugated nails and marking tags
-
- 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
- B25C1/04—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure
- B25C1/041—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure with fixed main cylinder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
- B25C5/00—Manually operated portable stapling tools; Hand-held power-operated stapling tools; Staple feeding devices therefor
- B25C5/16—Staple-feeding devices, e.g. with feeding means, supports for staples or accessories concerning feeding devices
- B25C5/1693—Staple-feeding devices, e.g. with feeding means, supports for staples or accessories concerning feeding devices co-ordinating with the feed of a second item
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
- B25C7/00—Accessories for nailing or stapling tools, e.g. supports
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Portable Nailing Machines And Staplers (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
ABSTRACT
A novel device is disclosed for driving nail-like fasteners with associated washers into a workpiece. The device comprises a pneumatic driver apparatus, preferably one substantially the same as the tool disclosed in U.S. Patent No. 4,040,554, in association with a washer dispenser apparatus capable of semi-automatically deploying washers from a washer magazine so that the washers are fixed to the workpiece by the heads of the fast-eners. The pneumatic driver and washer dispenser are attached together as a discrete assembly which is mounted on a hanger assembly so as to appear substantially weightless to a tool operator, and the driver and dispenser are adapted to be activated by a remotely positioned trigger device.
A novel device is disclosed for driving nail-like fasteners with associated washers into a workpiece. The device comprises a pneumatic driver apparatus, preferably one substantially the same as the tool disclosed in U.S. Patent No. 4,040,554, in association with a washer dispenser apparatus capable of semi-automatically deploying washers from a washer magazine so that the washers are fixed to the workpiece by the heads of the fast-eners. The pneumatic driver and washer dispenser are attached together as a discrete assembly which is mounted on a hanger assembly so as to appear substantially weightless to a tool operator, and the driver and dispenser are adapted to be activated by a remotely positioned trigger device.
Description
~3e~
F I ELD OF I NVENT I ON
This invention relates to pneumatlc driving apparatws in general and more particularly to a new type of fastener driving tool.
BACKGROUND OF THE INVENTION
Present methods of commercial steel production generally call for forming giant steel ingots from an initial melt by pourin the liquid metal into a mold, and later utilizing these ingots dur ing subsequent manufacturing operations. It is generally desired that these ingots be formed.substantially free of large voids.
It is well known in the steel industry that the undesired lar e voids appear in the ingot if premature solidification takes place in the region of the upper edges of the mold while the mold is sti 1 being filled or while the metal in the center of the mold is still moltèn. This premature solidification must therefore be prevented if substantially void-free ingots are to be càst. The typical method of preventing this solidification is to apply a liner of suitable insulation, generally available in the industry under the 2Q names Hot-Top and Riser, to the inside surface of the mold at its upper end. The insul~tion acts ~to prevent heat loss through the mold at its upper end, thereby assuring that the melt will not prematurely freeze on the mold. The preferred manner of attaching the insulation to the mold is to fasten it ~25 on by means of nail-like fasteners, with the point of the fast-ener penetra-ting the insulation and fixing itself in the wall of the mold and the head or shank of the fastener engaging the washer which in turn engages the insulation liner and holds it firmly against the moldO
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~ ~ llW501 Unfor-tunately, there have been a number of difficulties associated wi-th this fastening technique. First, the heavy cast iron molds used in casting the ingots have proven more impervious to-fastener penetration than ordinary steel. As a result, very high power impact drivers have been required to set the fasteners.
Second, the very nature of the fastening job has dictated that the impact drivers be highly mobile and light in weight so as to facilitate fastening. And third, it has been found to be highly preferable to deploy the fastener with a washer spaced between the head of the fastener and the insulation liner so as to prevent the fastener from excessively penetrating the insulation.
To date, only explosive-activated impact drivers have come close to satisfying these requiremen-ts. Unfortunately, these devices are also relatively slow in operation, expensive, dangerous to operate, an~ suffer from substantial noisé and recoil problems. In addition, these devices require that the operator manually position a preassembled washer/fastener in the front end of the barrel of the gun one at a time and the ex-plosive charge above the fastener. This manual loading of the washer/fastener and the explosive charge slows down the operation of the tool. Furthermore the lack of an adequate handle and trigger extension has added significant problems to utili~ing these tools around the giant(e.g. 5' x 4' x 10'~ cast iron molds previously described, e.g. operators have been required to work in an awkward position when attaching the insulation io the mold.
~, :, : ' . ' ' :
3~J501 As a result, one of the objects of the present invention is to provide a device for attaching insulati.on -to cast iron molds which is substantially free of the problems facing explosive-activated impact tools.
Another object is to provide means for adapting a pneumatic fastener driver of the type shown in U.S. Patent No.
4,040,554 for attaching insula~ion to cast iron molds.
Yet another.object is to provide means for automatically deploying a washer with the fastene:r as part of the normal operation o~ the tool/ without the operator having to manually position a washer/fastener for each fastening operation.
Still another object is to produce a fastening device which is relatively light in weight and has a high degree of mobility.
And another object is to provide a fastening tool which has a handle and trigger extension for using the tool in hard-to-reach locations.
Summar~ of the Present Invention In its broadest form the present invention-can be seen to provide a portable fastener driving tool comprising: -a hollow housing having first and second ends; first end means - -. for closing off the first end of the housing, the means having ~
a first opening therein for communicating with the interior of ~ ;
:~ the housing; a hammer longitudinally disposed within the ` . -~
housing and movable lengthwise along the first opening in the - .
first end means between a first retracted position and a second -.
extended position; means for driving the hammer from one to the other of its first and second positions, at least some of the means for driving the hammer being disposed within the housi.ng; ~ .
means ~or positioning a fastener where it may be engaged by the hammer so as to be driven from.the first opening in the first end means; and part support means including a member mounted in ' ~ sd/~' _3_ ~lW50~
. fixed rela-tion to the housing and magnet means for magnetically ; supporting a metal part to be fastened in front of the opening, .
the part support means being engageable with a work surface and adapted to allow a fastener discharged from the opening by the hammer to penetrate the metal part and transport the metal i part away from the part support means; and a safety mechanism comprising a movable actuator rod for enabling the tool when the part support means is engaged wlth a workpiece.
The Drawings .. 10 Fig. 1 is a side view in elevation showing the left side of the preferred form of the fastener driving tool, with selected portions broken away;
Fig. 2 is a sectional view of a preferred form of . pneumatic driver usable in the present invention, showing the driver with its hammer in a retracted or ready position;
Figs. 2A and 2B are enlarged views of portions of I Fig. 2;
Fig. 3 is a view like that of Fig~ 2 showing the same . driver with the hammer at the completion of its drive stroke;
Figs. 4, 8 and 10 are enlarged partial views of the front side of the washer.dispenser, showing the dispenser and associated washers in di~ferent positions, Fig. 8 appearing :i on the same sheet as Fig. 4.
~ ~ Figs. S, 9 and 11 are cross-sections of the washer . dispenser taken along lines 5-5, 9-9, 11-11 of FigsO 4, 8 and 10 respectively, Fig. 9 appearing on the same sheet as ..
Fig. 4.
:
'' ~ , , ' "
~ Sd~n'' -4-., , : " ~
Fig, 6 is a cross-section of the washer dispenser taken along line 6-6 of Fig, 7;
Fig. 7 is a partial view of the rear side of the washer dispenser;
Fig, 12, appearing on the same sheet as Fig. 6, is an enlarged partial view of the handle assembly, as taken from the viewpoint of line 12-12 of Fig, l;
Fig. 13 is a top plan view of the tool taken along ~ line 13-13 of Fig. l;
- 10 Fig. 14 is an enlarged~ partial side view showing the right side of the tool against a workpiece, with selected portions broken away;
Fig. 15 is a perspective view illustrating a mechanism for mounting the tool for use;
Fig. 16 is an enlarged partial view of the front side ;~
;i of a modified washer dispenser; and ' Fig, 17 is a cross_sectional view taken along line :................ , .
17-17 of Fig~ 16.
' In the several views, like members are identified by the same numerals, Description of the Preferred Embodime~t ~ -~
Referring first to Fig, 1, the fastener driving tool ~ `
is generally comprised of a pneumatic driver 100 for driving -~`
the fasteners, a washer dispenser 200 for semiautomatically positioning the washers where they may be engaged by the fasteners, a handle assembly 300 for positioning the tool , relative to the workpiece and activating it, and a support i~, - assembly 400 whereby the device may be hung so as to be sub-j stantially weightless in mid-alr, .' . .
,-, : ~ .
sd/~
Pneumatic driver 100 is shown in greater detail in Figs. 2, 2A, 2B and 3. Drlver 100 and its accompanyiny fastener magazine are subs-tantially the same as the corres~
ponding mechanisms disclosed in U.S. Patent No. 4,040,554, except that their housings have been modified slightly to incorporate them into the present invention. Accordingly, they are described herein on]y to the extent believed necessary to understand and apprecia-te the present invention. Referring first to Fig. 2, driver 100 generally comprises -~ 10 an outer housing 102 having a bottom nozzle 104 and accomodating a poppet valve 106, a central cylinder 108, - a control valve 110 r and a safety valve 112. A fastener magazine 114 is mounted to nozzle 104. These members, in conjunction with related parts, are intended to operate as is hereinafter briefly described. First, pressurized _ air is supplied to the manifold chamber 120 by connecting inlet port 122 to a suitable supply of pressurized air, as will be described later. This air passes through the orifice 124 of valve 110 (Fig. 2A) and acts on a valve head 126 to close off the opening in a pad 128. The alr passing through ~rifice 124 proceeds through an opening 129 r a passageway 130 and a tube 132 into a chamber 134 where it appLies a force to the '.'`;,;Y, .
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HM~-65 -6-,~ ' ;:
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1~3~5C)~
upper end of a poppet valve 106, whereby the lat-ter is uryed to assume the position shown in Fig. 2 wherein the rubber disc 136 forms a tigh-t seal with the upper edge of cylinder 108. Simul-taneously air is supplied by passageway 138 to the air reservoir chamber 140 and proceeds through the orifice 142 (Fig. 2B) of a safety valve 112 to urge the valve member 144 down against pad 146 to prevent a discharge of air from exit passageway 148. The air entering the chamber of safety valve 112 also passes through a passageway 150 into the interior of cylinder 108, thereby provid-ing a force on the underside of piston 152 which holds the piston up against the sealing disc 136 of poppet valve member 106. Any air trapped between the upper end of the piston 152 and the disc 13 6 is exhausted to the atmosphere via passageway 154 and~vent~ports 156. At this point the device is in its normal "primed" state, (Fig. 2) and it cannot be fired unless a safety mechanism actuator rod 158 is forced upwardly far enough for valve member 144 to un- _ block the opening in valve seat 146. If the trigger 160 should be squeezed while operating rod 158 is in the down position shown in Fig. 2, valve member 126 will change positions and the air pressure acting on the upper side of the poppet valve 106 is released by a discharge of air from chamber 134 via tube 132, the internal chamber in which valve member 126 is dis-posed, valve opening 131 and exit port 162. As a result, the pres-sure in reservoir 140 will then move poppet valve 106 up and there-by allow pressurized air to act on the upper end of piSton 152.
However, no movement of the piston will occur because an equilibrium force condition exists as a result of the opposing force of the pressurized air acting on the bottom surface -- - ~ ' , llW501 of piston 152 and the additional static frictional forces due to the engagement of seal 164 with the cylinder 108 and the rod-like hammer 166 with stationary seal 168. If, however, safety mechanism actuator rod 158 is pushed far enough upwards so that valve member 144 now blocks off orifice 142 (Fig. 3) the air pressure acting on the underside of piston 152 is rapidly exhausted to the atmosphere by outflow of air via passageway 150, bore 170 and port 148. If the trigger 160 should now be squeezed so as to move the valve member 126 up far enough to close off orifice 124 while safety mechanisms actuator rod 158 is still pushed upwards (Fig. 3), poppet valve 106 will move up rapidly toward chamber 134 and the full line pressure in reservoir 140 will act on the upper end of piston 152 so as to cause the latter to move rapidly through its normal firing stroke so as to engage hammer 166 with a .. ,,,~ ~ ~ . . ...
fastener 177 (advanced by magazine 114) and thereby drive it fxom the nozzle hole 181 of pneumatic driver 100. The piston 152 will not return to its normal starting position until the actuator rod 158 and trigger 160 are both released. Then the driver will be ready to fire again, a new fastener having been automatically loaded into the firing chamber by the fastener magazine 114. In the preferred embodiment described and illustrated herein the safety mechanism actua-tor rod 158 is adapted to yield under about 5 pounds of pressure.
~MH-65 -8-. .' . ,. ... 1~ ..
Mounted to the front end of driver 100 is a washer dis-penser 200 for semi-automatically positioning washers where they may be engaged by fasteners as the fasteners exit from the nozzle of driver 100. Washer dispenser 200 is shown in detail in Figs.
1, 4-11 and 13 and 14. Referring first -to Figs. 4 and 5, the dispenser is shown to generally comprise a washer rack or ma~azine 202 for slidably storing one or more washers 204, a gate in the form of a pivot plate 206 for use in dispensing the washers fro~
rack 202, and a washer holder 208 for holding a washer just prior to its engagement with'a fastener.
Rack 202 is comprised of a long metal bar 210 having a flat front surface 212 and side surfaces 214. As shown in Fi~. 6, a longitudinally-extending channel 216 is $ormed in front surface 212 .
Channel 216 is comprised of a floor 217 and side tracks 219 and has a cross-sectional profile as shown in Fig. 6. Side tracks 219 are pr`o'perly'sized so as ~o slidably constrain metal washers 204 along the length of bar 210. Referring now to Figs. 4 and 5, the floor 217 of channel 216,is removed near the bottom o bar 210 so as to form an opening 215 in which a pivot plate 206 is posi-tioned. Plate 206 is provided wlth front bevelled surfaces'218 and 220 and is adapted to plVOt on a rod 222 whose ends are anchored in openings in the sides of bar 210, so that surfaces 218 and 220 can alternately be placed substantially flush with the bottom surfaces 221 (Fig. 6) of side tracks 219. Pivot-plate 206 carries 2i a pair of pins or projections 224 which extend perpendicularly out-ward from surface 218 and a pair of pins 226 ~hich extend ' perpendicularly outward from surface 220,,and pins 224 and 226 ~re sized so that tl) when surface 218 is substantially aligned with the surIaces 221 of channel 216, pins 224 may serve as a stop for washers 204 sliding along tracks 219; (2) when surface 220 is aligned with the surfaces 221 of tracks 219, pins 226 may serve as Hi~lH-65 _9_ . .
.
'`` , 11 : : `, . . .- ,`` : , ~ L3~iO~ ( ¦ a stop for washers sllding along tracks 219; and (3) w~en either ¦ pair of pins intrudes into the path of the washers, the o-ther pair ¦ of pins sits fully withdrawn from that path.
¦ Washer holder 208 is pivotally attached to the bottom of bar ¦ 210 by means of a pin 228. Holder 208 comprises a base plate 230 ¦ and a cover plate 233, with the base plate having a central bore ¦ 232 with a diameter somewhat larger than that of the fasteners ¦ to be deployed, a counterbore 234 having a diameter somewhat ¦ larger than that of a washer, and a curved flange forming a toe 23 .
¦ A washer channel 238 is providëd between base plate 230 and its ¦ cover plate 233 in order that when channel 238 is suita~ly aligned ¦ co-planar (as hereinafter described) with the washer channel 216 formed in bar 210, a washer can be gravity fed along channel 216 ¦ and negotiated past pivot plate 206 into counterbore 234 of washer ¦ holder 208. A pair of steel pins 244 in plate 230 at toe 236 ¦serve to absorb the force of the washers' fall and act as stops, ¦ and a pair o~ cylindrical magnets 242 are mounted into suitable I ~ .
¦ bores in plate 230 so as to hold the washers in counterbore 234.
l Pivot-plate 206 is operated so as to regulate the advancement ¦ of washers from rack 202 into holder 208 by means hereinafter ¦ described. Two pairs of leaf spring members 246 and 248 and an ¦ activator mechanism 250 ~Figs. 4-7 and 11) are provided to cause - ¦ pivot plate 206 ~o suitably rotate on rod 222 so as to allow the ¦ passagç of washers 204 past the plate. Springs 248 are attached t ¦ the rear side of bar 210 by screws 249 and extend over the rear side o~ pivot plate 206, while springs 246 are attached to the rear side of base plate 230 by screws 251 and extend over the rear side of the same pivot plate. Springs 246 normally-keep washer holder 208 in the angular position shown in Fig. 5. In this position springs 248 generate a greater pushing force on pivot plate 206 than springs 246, but when washer holder 208 is pressed inwards so that its channel 238 is aligned co-planar with the channel 216 in bar 210, the force of springs 246 will exceed the force of springs 248.
.
-` ~3~5~ ( Still referring to Flgs. 4-7, activator mechanism 250 con-sists o~ a tongue 252 slidably disposed .in a channel 254 formed in bar 210 and slidably retained by a plate 255 which is bolted to bar 210. Tongue 252 is urged downward toward washer holder 208 by a spring 256 which is captivated in channel 254, so that tongue 252 may extend over the rear edge of pivot plate 206 when surface 218 is aligned with surface 221 and thereby lock the pivot plate in the position shown in Figs. 4, 5 and 7. A pin 258 is attached to tongue 252 and is adapted to slide in an elongated opening 260 in retainer plate 255. Hole 260 is arranged so as to allow the tongue to be manually urged back (by means hereafter de~cribed acting against pin 258) against spring 256 far enough to be dis-engaged from pivot plate 206. When this is done the pivot plate will automatically rotate to the position sho~n in Figs. 8 and 9, due to the greater force of springs 248. The pivot plate may be rotated back to the position shown in Figs. 4 and 5 by forcing holder 208 to an upright tflat) position (Figs. 10 ànd 11) so.that -channels 216 and 238 align themselves and the force of springs 246 . exceeds the force of springs 248. The rear side of the protruding portion of the tongue is suitably bevelled to allow the tongue to yield inwardly under this action.
The washer dispenser is designed to operate as follows.
Assume that the mechanism is in a "load" position as shown in.Figs 4 and 5. In this state holder 208 is at an angle to bar Z10 and `25 . pivot plate surface 218 is substantially flush with the surface 221 of tracks 219. A plurality of washers 204 may then be fed int the top of channel 216, with gravity advanclng the washers downwar until pins 224 stop their advancement. Next the operator properly stimulates pin 258 (by means hereinafter described) to slide tongu , 252 out of engagement with pivot plate 206, thereby allowing springs 248 to rotate the pivo-t plate on rod 222 and bringing the mechanism to a "ready" position, as shown in Figs. 8 and 9. ~ur-HM~-65 ing this operation pins 224 are withdrawn from the path of the -- ~ .
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washers and pins 226 are projected into the path, thus allowing the washers to fall along rack 202 to their new position.
Finally, the dispenser is put in a "fir:ing" position by forcing holder 208 backwards into the position shown in Figs. 10 and 11 so that channel 238 becomes aligned with channel 216 and pivot plate 206 is rotated again by springs 246 so as to again place its pins 224 in washer~interceptiny position. As the plate rotates, pins 226 withdraw and the lead washer drops into counterbore 234, where it is retained by magnets 242 ready to be engaged by a fastener fired from driver 100.
Washer dispenser 200 is attached to driver 100 in the follow-ing manner. First a pair of support struts 280 are fastened to the nozzle 104 of driver 100, as shown in Figs. 1 and 14. Then dispenser 200 is screwed to support struts 280 via screws 282 (Fig. 4). Dispenser 200 mounts to driver 100 in such a manner that when holder 208 is pressed inwards for alignment with washer rack 202, holder 208 contacts nozzle 104 and bore 232 in holder 208 , , . ,,.. ~............... "" .~ . ,,.
lines up with the nozzle hole 181 (Fig. 11) of driver 100. A wear pin 286 (Figs. 4 and 11) is mounted in washer holder 203 for contac ting safety mechanism actuator rod 158 when holder 208 is forced backwards. ~
A handle assembly 300 is provided to facilitate the coordina-ted operation o~ driver 100 and washer dispenser 200, particularly in hard to reach places such as about the top edges of the large ~2~5 cast iron molds previously described. This handle assembly is shown in Figs. 1 and 12-15 and general]y comprises a pair of support bars 302, a palr of auxiliary suppor-t bars 304 and a handle 306. The lower ends of bars 302 are secured to ears 308 formed integral with the housing of driver 100 by means of a ?in 310. Bars 302 angle upwards away from the drlver, coming together near their upper ends and forming a single extension thereafter for attachment to handle 306. Auxiliary support bars 304 are in turn screwed to an ear 312 formed integral with the IH-65 lousing of driver 100 by means of a pin 314. Bars 304 extend , ~
~i -12-~13050~L
upwards away from the driver and are joined to bars 302 inter-mediate their length by a pin 316. Bars 304 serve to fi~ support bars 302 firmly in position relative to driver 100.
Elandle member 306 is a-ttached at i-ts top to the joined ends of rods 302 and a support strut 320 extends between one end of the handle and a support plate ~17 (Fig. 12~ which is mounted and secured to bars 302. A second support strut 321 extends between and is secured at its end to plate 317 and the washer magazine 200.
In addition, a hand grip 322 may be ~itted to support bars 302 above support strut 321.
Set into and pivotally mounted to handle member 306 is a trigger 323 which is adapted to activate the driver and washer magazine by means hereina~ter described. Referring now to Fig. 12, mounted to the underside of support plate 317 are two mounts 326 which slidably constrain a pin 328. A pair of connecting rods 330 and 331 joined by a turnbuckle 332 serve to link trigger 323 to pin 328 so that the latter will slide along mount 326 when the trigger is depressed. Pin 328 is in turn coupled by means o~
a pair of rigid support rods 332 (Figs. 1 and 13) to an actuator rod 333 which is pivotaily mounted between a pair of arms 334 (only one of which is shown) that are in turn pivotally mounted to bosses 336 formed integral with opposite sides of the driver housing by means o~ pivot pins 337. Rod 330 is located in light contact with trigger 160. Pin 328, rods 332, rod 333 and arms 334 are positioned such that when pin 328 is moved up by depressing trigger 323, rods 332 will cause rod 330 and arms 334 to pivot on pins 337, thereby driving actuator rod 333 against driver trigger 160 so as to depress the latter. When the pull on trigger 323 is released, the return action of driver trigger 160 will cause the linkage members to work in reverse, thereby restoring trigger 323 to its original position. In this way, trigger 323 can be used to effectively operate driver 100.
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As shown in E'ig. 14, also engaged with actuator pin 333 is a yoke comprising side sections 340 which are mounted so as to be supported by and to pivot about pin 310 as pin 333 is rotated and a body section 341 which is attached to and operates a link 342. The latter is pivotally connected to one end of a U-shaped lever 255 which forms part of activator mechanism 250. Lever 255 is pivotally attached to struts 280 by pins 281 and is positioned to engage pin 258 (Figs. 8 and 13) and serves to force the activator tongue 252 to slide upward along bar 210 each time trigger 323 is depressed. In this way, trigger 323 serves to activate washer dispenser tongue 252 as well as pneumatic driver 100.
The combined sub-assembly of pneumatic driver 100 r washer . magazine 200 and handle assembly 300 is intended to be weight-lessly support in mid-air by a hangar assembly 400, as shown in . Figs. 1 and 15. Attached to the inlet port 122 of driver casing ~ .,,.~ . . , s 102 is a rigid air pipe 402 which serves both to support the tool and deliver pressurized air to driver 100 via a fitting 404 which . is coupled by an air hose (not shown) to a suitable source of ~20 pressurized air such as an air compressor (also not shown).
Hangar assembly 400 comprises a block 403 which is affixed to and . connects pipe 402 and fitting 404, and a hangar member 406 that .
is secured to block 403 and serves as a connector to a cable 40~.
The latter is connected by an automatic balancing mechanism 410 . 25; and a second cable 411 to a suitable support assembly 412 which is adapted to permit the tool freedom.of movement in two directions in a horizontal plane. The balanciny mechanism .410 is a conven- -tional apparatus well known to persons skilled in the art, one H_65 -14-~, 1~ llao5ol ( I
form of whlch is sold commercially under the tradename AERO-MOTIVE
BAI,ANCE~ by Aero-Motive Mfg. Co. of Kalamazoo, Michigan.
Suffice it to state that cable ~08 is wound on a spring-biased drum or wheel forming part of balancing mechanism 410 and is capable of being extended or retracted when the force of gravi-ty on the tool is overcome by the operator pulling it down or pushing it up~ and of remaining in any given position when the operater releases the tool. If desired the mechanism 410 could be modified so as to automatically raise the tool to a preset height each time it is released by the operator.
The support assembly 412 may take various forms. By way of example but not limitation the support assembly may be a motorized crane. It also may be relatively light weigh-t so as to be perable by hand. Thus, the support assembly 412 may comprise pair of parallel rails 416 which are fixed and may, for xample, be suspended from the ceiling or roof structure of a teel mill, a main carriage 418 having wheels 420 and 422 which ide on rails 416, a secondary carriage 424 comprising wheels 26 which ride in a groove 428 in carriage 418, and a rigid epending yoke 430 which serves as a point of at-tachment for able 411. A third cable 432 is at-tached to yoke 430 and rovided with a suitable handle 434 at its bottom end. Cable 32 is used by the operator to move carriages 418 and 424 for he purpose of maneuvering the driver tool into the desired orking position.
The installation and operation of the tool will now be escribed. First the tool is mounted to its support assembly 12, and an air hose is coupled to fitting 404 so that the driver s suitable energized with compressed air. Then a fastener HMH-65 -15~
.- .
.
:. .
~ 5~
magazine loaded with a Eresh supply of fasteners is attached to the driver. Next the washer dispenser is manually put into its "load" position and a plurality of washers are fed into the top portion of the washer rack. The washers assume the position shown in Figs. 4 and 5. Now the operator pulls trigger 323 on the handle assembly so as to br:ing the washer dispenser mechanism to its ready position, thereby allowing the washers to drop into the position shown in Figs. 9 and 10. No fasteners are fired as this is done, since the driver's safety mechanism actuator rod 158 is not yet depressed.
The tool now is ready for use. The operator places ane hand on hand grip 322 and the other hand on handle 306 and posi-tions the nose of the tool against a workpiece as shown in Fig. 14.
In the case of preparing molds for casting steel ingots, the workpiece consists of an insulation liner 500 which is to be fastened to the inside surface 502 of a mold 504. Little effort is required to move the tool since the rail support assembly 412 allows horizontal freedom of movement and the automatic balancing mechanism 410 makes the tool appear substantially weightless to the operator. As the workpiece is engaged the washer holder 208 is forced inwards (as shown in Fig. 14) so it is aligned with the washer rack and a washer is thereby released from pins 226 of pivot plate 206 and advanced into the holder 208. This brings the dispenser to the fire position previously described. As this is done, safety mechanism rod 158 is simultaneously depressed by the rear side o-f holder 208 so that the gun is made ready to fire.
Now trigger 323 is depressed, whereupon a fastener is fired from the driver. The shank of the fired fastener passes through the 1~30501 ``
center hole of thç washer in holder 208 and the head of the fastener engages the washer, thereby carrylng the washer forward with the fastener to the workpiece. The fastener penetrates the insulation liner 500 and enters the side wall of the mold far enough for the head or the shan~ of the fastener to clamp the washer against the liner. The $rigger is maintained in a depressed position as the driver's recoil brings the tool away from the workpiece, with front holder 208 returning to its angular position (Fig. 5) and bringing the dispenser back to the ready state. Then the trigger is released, the toe of ~he tool brought against the workpiece again so the dispenser returns once more to its fire position, and another fastening is made.
This procedure is repeated until either the~fastener or washer magazine is depleted or the work is finished.
MODIFICATIONS OF THE INVENTION
.. . , It is understood that the preferred embodiment illustrated and described herein is intended as an example and lS not to be considered as limiting the scope of the present invention, since various alterations and modifications may be carried out on the illustrated embodiment without departlng from the essential features of the invention. In this connection reference is had to Figs. 16 and 17 where the washer dispenser apparatus and certain parts of the driver have been modified to illustrate another contemplated design. The modified dispenser 200A comprises a vertical rack 506, a channel 508 disposed in rack 506, a first bore 510 disposed in channel 508, and a flange ' '' . .
~ 65 - -17-. .
, --~
11;~05~
512 having a semi-circular lnner surEace 514 that is concen-tric with bore 510. Flange 512 has a hole 516. Channel 508 has a cross-section substantially the same as the groove 216 shown in washer dispenser 200 and serves to slidably constrain a plurality of washers 204 along rack 506. The inner surface 514 of flange 512 forms an end wall for channel 508 and serves to help position washers which are gravity fed from the upper part of rack 506. The curvature of surface 514 is made so that it is slightly greater than the correspondin~ outer dimension of washers 204 and so that its ends are flush with the sides of channel 508 as shown. A pair of magnets 518 are set in rack 506 for holding washers 204 in alignment with bore 510. A pin 520 is embedded in rack 506 along its center line in surface 514 to - absorb the force of the gravity-fed washers. Bore 510 has a diameter somewhat greater than the maximum diameter of a fastener.
Driver nozzle 104 and safety mechanism actuator rod 158 are modified slightly as shown in Fig. 17. More specifically, a slot 526 is cut into nozzle 104 and rod 158 is formed with an off-set 159. Rack 506 is mounted to driver 100 by screws 282 and is seated so that bore 510 is aligned with the nozzle hole 181 and the safety mechanism actuator rod is directed out through slot 516.
The modified washer dispenser is intended to operate as follows, First a pl~lrality of washers 204 are loaded into the top of rack 506, with gravity feeding them downwards along groo~e 508 until the bottom washer seats against pin 520. The ends of curved surface 514 of flange 512 limit sidewise movement of the washer and thus coact with pin 520 to center the washer on the hole 510. Magnets 518 serve to hold the washer in place, with ' ~ ,:
~ 51)~L
~ashers along the remainder of rack 506 being supported ~y the bottom washer. Next the fastener tool is positioned against a workpiece so that safety mechanism actuator rod 158 is pressed inwards and the driver made ready to fire. Then the trigger 323 is pulled and a fastener is fired from the driver. ~he fastener exits from nozzle 104 and engages the bottom washer and carries it from the rack to the workpiece. ~s this is done the remaining washers are dropped downwards b;y gravity until the lowest one assumes a position against stop pin 520. The tool is then ready for use once again.
Other changes are also possible. One such change might be to use one long rod to couple tri~ger 323 to pin 330, instead of the mechanism now employed. Another change might be to change the tools' support means to a different form. These and other changes of their type are foreseen as readily obvious to one skilled in the art.
. .
ADVANTAGES OF THE PRESENT INVENTION
There are numerous advantages to using the present invention rather than existing tools. F1rst, the tool is pneumatically operated and therefore avoids all the undesirable characteristics of explosive-activated drivers ~.e.g. nolse, recoil, smoke, safety problems, slowness of operation, etc.). Second, the tool is adapte to automatically deploy a washer from a washer magazine with each fastener, without the need to manually load a preassembled washer~
pin into a holder before each fastening. Operator productivity is thereby increased. ~hir~, the tool is provided with a handle . ' ' . " , .
HMH-65 ~ -19-.
. .
~ S~
extension to facilitate its use around hard to reach places, such as about the top of the cast iron molds previously mentioned.
Fourth, the tool is provided with ~ hangar assembly which makes it relatively weightless to an operator. Fifth, because the flange or toe 236 is made thicker than the rest of holder 208, the latter will always be sure to be deflected to the position shown in FigsO 11 and 14 when brought into contact with the workpiece even though the workpiece may not be fully flat.
Sixth only one washer is fed at a time, thereby avoiding jamming of the tool. Seventh, the tool cannot be fired until it is engaged with a work-piece. A further advantage is that the washer dispenser may be eliminated and the magnets 242, 518 or other suitable washer retaining means may be mounted directly to the end surface of tool nozzle 104, whereby washers may be manually attached to the tool in position to be picked up by a nail as it leaves the nozzle and enters a workpiece.
The tool of Figs. 1-13 may be modified by omltting the magnets 242 since the washers a~ not on the pivot plate until the latter is engaged with the workpiece. Also if after a washer drops onto the pivot plate 206, the tool is retracted from the workpiece without being fired, the washer on the pivot plate will be retained in place by gravity (note that pivot plate 206 is at an angle when it is not forced back by engagement with a workpiece). Still other advantages will be obvious to persons skilled in the art.
.
F I ELD OF I NVENT I ON
This invention relates to pneumatlc driving apparatws in general and more particularly to a new type of fastener driving tool.
BACKGROUND OF THE INVENTION
Present methods of commercial steel production generally call for forming giant steel ingots from an initial melt by pourin the liquid metal into a mold, and later utilizing these ingots dur ing subsequent manufacturing operations. It is generally desired that these ingots be formed.substantially free of large voids.
It is well known in the steel industry that the undesired lar e voids appear in the ingot if premature solidification takes place in the region of the upper edges of the mold while the mold is sti 1 being filled or while the metal in the center of the mold is still moltèn. This premature solidification must therefore be prevented if substantially void-free ingots are to be càst. The typical method of preventing this solidification is to apply a liner of suitable insulation, generally available in the industry under the 2Q names Hot-Top and Riser, to the inside surface of the mold at its upper end. The insul~tion acts ~to prevent heat loss through the mold at its upper end, thereby assuring that the melt will not prematurely freeze on the mold. The preferred manner of attaching the insulation to the mold is to fasten it ~25 on by means of nail-like fasteners, with the point of the fast-ener penetra-ting the insulation and fixing itself in the wall of the mold and the head or shank of the fastener engaging the washer which in turn engages the insulation liner and holds it firmly against the moldO
HM~I-65 -1--~_ ~ . . i:3 ~
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~ ~ llW501 Unfor-tunately, there have been a number of difficulties associated wi-th this fastening technique. First, the heavy cast iron molds used in casting the ingots have proven more impervious to-fastener penetration than ordinary steel. As a result, very high power impact drivers have been required to set the fasteners.
Second, the very nature of the fastening job has dictated that the impact drivers be highly mobile and light in weight so as to facilitate fastening. And third, it has been found to be highly preferable to deploy the fastener with a washer spaced between the head of the fastener and the insulation liner so as to prevent the fastener from excessively penetrating the insulation.
To date, only explosive-activated impact drivers have come close to satisfying these requiremen-ts. Unfortunately, these devices are also relatively slow in operation, expensive, dangerous to operate, an~ suffer from substantial noisé and recoil problems. In addition, these devices require that the operator manually position a preassembled washer/fastener in the front end of the barrel of the gun one at a time and the ex-plosive charge above the fastener. This manual loading of the washer/fastener and the explosive charge slows down the operation of the tool. Furthermore the lack of an adequate handle and trigger extension has added significant problems to utili~ing these tools around the giant(e.g. 5' x 4' x 10'~ cast iron molds previously described, e.g. operators have been required to work in an awkward position when attaching the insulation io the mold.
~, :, : ' . ' ' :
3~J501 As a result, one of the objects of the present invention is to provide a device for attaching insulati.on -to cast iron molds which is substantially free of the problems facing explosive-activated impact tools.
Another object is to provide means for adapting a pneumatic fastener driver of the type shown in U.S. Patent No.
4,040,554 for attaching insula~ion to cast iron molds.
Yet another.object is to provide means for automatically deploying a washer with the fastene:r as part of the normal operation o~ the tool/ without the operator having to manually position a washer/fastener for each fastening operation.
Still another object is to produce a fastening device which is relatively light in weight and has a high degree of mobility.
And another object is to provide a fastening tool which has a handle and trigger extension for using the tool in hard-to-reach locations.
Summar~ of the Present Invention In its broadest form the present invention-can be seen to provide a portable fastener driving tool comprising: -a hollow housing having first and second ends; first end means - -. for closing off the first end of the housing, the means having ~
a first opening therein for communicating with the interior of ~ ;
:~ the housing; a hammer longitudinally disposed within the ` . -~
housing and movable lengthwise along the first opening in the - .
first end means between a first retracted position and a second -.
extended position; means for driving the hammer from one to the other of its first and second positions, at least some of the means for driving the hammer being disposed within the housi.ng; ~ .
means ~or positioning a fastener where it may be engaged by the hammer so as to be driven from.the first opening in the first end means; and part support means including a member mounted in ' ~ sd/~' _3_ ~lW50~
. fixed rela-tion to the housing and magnet means for magnetically ; supporting a metal part to be fastened in front of the opening, .
the part support means being engageable with a work surface and adapted to allow a fastener discharged from the opening by the hammer to penetrate the metal part and transport the metal i part away from the part support means; and a safety mechanism comprising a movable actuator rod for enabling the tool when the part support means is engaged wlth a workpiece.
The Drawings .. 10 Fig. 1 is a side view in elevation showing the left side of the preferred form of the fastener driving tool, with selected portions broken away;
Fig. 2 is a sectional view of a preferred form of . pneumatic driver usable in the present invention, showing the driver with its hammer in a retracted or ready position;
Figs. 2A and 2B are enlarged views of portions of I Fig. 2;
Fig. 3 is a view like that of Fig~ 2 showing the same . driver with the hammer at the completion of its drive stroke;
Figs. 4, 8 and 10 are enlarged partial views of the front side of the washer.dispenser, showing the dispenser and associated washers in di~ferent positions, Fig. 8 appearing :i on the same sheet as Fig. 4.
~ ~ Figs. S, 9 and 11 are cross-sections of the washer . dispenser taken along lines 5-5, 9-9, 11-11 of FigsO 4, 8 and 10 respectively, Fig. 9 appearing on the same sheet as ..
Fig. 4.
:
'' ~ , , ' "
~ Sd~n'' -4-., , : " ~
Fig, 6 is a cross-section of the washer dispenser taken along line 6-6 of Fig, 7;
Fig. 7 is a partial view of the rear side of the washer dispenser;
Fig, 12, appearing on the same sheet as Fig. 6, is an enlarged partial view of the handle assembly, as taken from the viewpoint of line 12-12 of Fig, l;
Fig. 13 is a top plan view of the tool taken along ~ line 13-13 of Fig. l;
- 10 Fig. 14 is an enlarged~ partial side view showing the right side of the tool against a workpiece, with selected portions broken away;
Fig. 15 is a perspective view illustrating a mechanism for mounting the tool for use;
Fig. 16 is an enlarged partial view of the front side ;~
;i of a modified washer dispenser; and ' Fig, 17 is a cross_sectional view taken along line :................ , .
17-17 of Fig~ 16.
' In the several views, like members are identified by the same numerals, Description of the Preferred Embodime~t ~ -~
Referring first to Fig, 1, the fastener driving tool ~ `
is generally comprised of a pneumatic driver 100 for driving -~`
the fasteners, a washer dispenser 200 for semiautomatically positioning the washers where they may be engaged by the fasteners, a handle assembly 300 for positioning the tool , relative to the workpiece and activating it, and a support i~, - assembly 400 whereby the device may be hung so as to be sub-j stantially weightless in mid-alr, .' . .
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Pneumatic driver 100 is shown in greater detail in Figs. 2, 2A, 2B and 3. Drlver 100 and its accompanyiny fastener magazine are subs-tantially the same as the corres~
ponding mechanisms disclosed in U.S. Patent No. 4,040,554, except that their housings have been modified slightly to incorporate them into the present invention. Accordingly, they are described herein on]y to the extent believed necessary to understand and apprecia-te the present invention. Referring first to Fig. 2, driver 100 generally comprises -~ 10 an outer housing 102 having a bottom nozzle 104 and accomodating a poppet valve 106, a central cylinder 108, - a control valve 110 r and a safety valve 112. A fastener magazine 114 is mounted to nozzle 104. These members, in conjunction with related parts, are intended to operate as is hereinafter briefly described. First, pressurized _ air is supplied to the manifold chamber 120 by connecting inlet port 122 to a suitable supply of pressurized air, as will be described later. This air passes through the orifice 124 of valve 110 (Fig. 2A) and acts on a valve head 126 to close off the opening in a pad 128. The alr passing through ~rifice 124 proceeds through an opening 129 r a passageway 130 and a tube 132 into a chamber 134 where it appLies a force to the '.'`;,;Y, .
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HM~-65 -6-,~ ' ;:
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upper end of a poppet valve 106, whereby the lat-ter is uryed to assume the position shown in Fig. 2 wherein the rubber disc 136 forms a tigh-t seal with the upper edge of cylinder 108. Simul-taneously air is supplied by passageway 138 to the air reservoir chamber 140 and proceeds through the orifice 142 (Fig. 2B) of a safety valve 112 to urge the valve member 144 down against pad 146 to prevent a discharge of air from exit passageway 148. The air entering the chamber of safety valve 112 also passes through a passageway 150 into the interior of cylinder 108, thereby provid-ing a force on the underside of piston 152 which holds the piston up against the sealing disc 136 of poppet valve member 106. Any air trapped between the upper end of the piston 152 and the disc 13 6 is exhausted to the atmosphere via passageway 154 and~vent~ports 156. At this point the device is in its normal "primed" state, (Fig. 2) and it cannot be fired unless a safety mechanism actuator rod 158 is forced upwardly far enough for valve member 144 to un- _ block the opening in valve seat 146. If the trigger 160 should be squeezed while operating rod 158 is in the down position shown in Fig. 2, valve member 126 will change positions and the air pressure acting on the upper side of the poppet valve 106 is released by a discharge of air from chamber 134 via tube 132, the internal chamber in which valve member 126 is dis-posed, valve opening 131 and exit port 162. As a result, the pres-sure in reservoir 140 will then move poppet valve 106 up and there-by allow pressurized air to act on the upper end of piSton 152.
However, no movement of the piston will occur because an equilibrium force condition exists as a result of the opposing force of the pressurized air acting on the bottom surface -- - ~ ' , llW501 of piston 152 and the additional static frictional forces due to the engagement of seal 164 with the cylinder 108 and the rod-like hammer 166 with stationary seal 168. If, however, safety mechanism actuator rod 158 is pushed far enough upwards so that valve member 144 now blocks off orifice 142 (Fig. 3) the air pressure acting on the underside of piston 152 is rapidly exhausted to the atmosphere by outflow of air via passageway 150, bore 170 and port 148. If the trigger 160 should now be squeezed so as to move the valve member 126 up far enough to close off orifice 124 while safety mechanisms actuator rod 158 is still pushed upwards (Fig. 3), poppet valve 106 will move up rapidly toward chamber 134 and the full line pressure in reservoir 140 will act on the upper end of piston 152 so as to cause the latter to move rapidly through its normal firing stroke so as to engage hammer 166 with a .. ,,,~ ~ ~ . . ...
fastener 177 (advanced by magazine 114) and thereby drive it fxom the nozzle hole 181 of pneumatic driver 100. The piston 152 will not return to its normal starting position until the actuator rod 158 and trigger 160 are both released. Then the driver will be ready to fire again, a new fastener having been automatically loaded into the firing chamber by the fastener magazine 114. In the preferred embodiment described and illustrated herein the safety mechanism actua-tor rod 158 is adapted to yield under about 5 pounds of pressure.
~MH-65 -8-. .' . ,. ... 1~ ..
Mounted to the front end of driver 100 is a washer dis-penser 200 for semi-automatically positioning washers where they may be engaged by fasteners as the fasteners exit from the nozzle of driver 100. Washer dispenser 200 is shown in detail in Figs.
1, 4-11 and 13 and 14. Referring first -to Figs. 4 and 5, the dispenser is shown to generally comprise a washer rack or ma~azine 202 for slidably storing one or more washers 204, a gate in the form of a pivot plate 206 for use in dispensing the washers fro~
rack 202, and a washer holder 208 for holding a washer just prior to its engagement with'a fastener.
Rack 202 is comprised of a long metal bar 210 having a flat front surface 212 and side surfaces 214. As shown in Fi~. 6, a longitudinally-extending channel 216 is $ormed in front surface 212 .
Channel 216 is comprised of a floor 217 and side tracks 219 and has a cross-sectional profile as shown in Fig. 6. Side tracks 219 are pr`o'perly'sized so as ~o slidably constrain metal washers 204 along the length of bar 210. Referring now to Figs. 4 and 5, the floor 217 of channel 216,is removed near the bottom o bar 210 so as to form an opening 215 in which a pivot plate 206 is posi-tioned. Plate 206 is provided wlth front bevelled surfaces'218 and 220 and is adapted to plVOt on a rod 222 whose ends are anchored in openings in the sides of bar 210, so that surfaces 218 and 220 can alternately be placed substantially flush with the bottom surfaces 221 (Fig. 6) of side tracks 219. Pivot-plate 206 carries 2i a pair of pins or projections 224 which extend perpendicularly out-ward from surface 218 and a pair of pins 226 ~hich extend ' perpendicularly outward from surface 220,,and pins 224 and 226 ~re sized so that tl) when surface 218 is substantially aligned with the surIaces 221 of channel 216, pins 224 may serve as a stop for washers 204 sliding along tracks 219; (2) when surface 220 is aligned with the surfaces 221 of tracks 219, pins 226 may serve as Hi~lH-65 _9_ . .
.
'`` , 11 : : `, . . .- ,`` : , ~ L3~iO~ ( ¦ a stop for washers sllding along tracks 219; and (3) w~en either ¦ pair of pins intrudes into the path of the washers, the o-ther pair ¦ of pins sits fully withdrawn from that path.
¦ Washer holder 208 is pivotally attached to the bottom of bar ¦ 210 by means of a pin 228. Holder 208 comprises a base plate 230 ¦ and a cover plate 233, with the base plate having a central bore ¦ 232 with a diameter somewhat larger than that of the fasteners ¦ to be deployed, a counterbore 234 having a diameter somewhat ¦ larger than that of a washer, and a curved flange forming a toe 23 .
¦ A washer channel 238 is providëd between base plate 230 and its ¦ cover plate 233 in order that when channel 238 is suita~ly aligned ¦ co-planar (as hereinafter described) with the washer channel 216 formed in bar 210, a washer can be gravity fed along channel 216 ¦ and negotiated past pivot plate 206 into counterbore 234 of washer ¦ holder 208. A pair of steel pins 244 in plate 230 at toe 236 ¦serve to absorb the force of the washers' fall and act as stops, ¦ and a pair o~ cylindrical magnets 242 are mounted into suitable I ~ .
¦ bores in plate 230 so as to hold the washers in counterbore 234.
l Pivot-plate 206 is operated so as to regulate the advancement ¦ of washers from rack 202 into holder 208 by means hereinafter ¦ described. Two pairs of leaf spring members 246 and 248 and an ¦ activator mechanism 250 ~Figs. 4-7 and 11) are provided to cause - ¦ pivot plate 206 ~o suitably rotate on rod 222 so as to allow the ¦ passagç of washers 204 past the plate. Springs 248 are attached t ¦ the rear side of bar 210 by screws 249 and extend over the rear side o~ pivot plate 206, while springs 246 are attached to the rear side of base plate 230 by screws 251 and extend over the rear side of the same pivot plate. Springs 246 normally-keep washer holder 208 in the angular position shown in Fig. 5. In this position springs 248 generate a greater pushing force on pivot plate 206 than springs 246, but when washer holder 208 is pressed inwards so that its channel 238 is aligned co-planar with the channel 216 in bar 210, the force of springs 246 will exceed the force of springs 248.
.
-` ~3~5~ ( Still referring to Flgs. 4-7, activator mechanism 250 con-sists o~ a tongue 252 slidably disposed .in a channel 254 formed in bar 210 and slidably retained by a plate 255 which is bolted to bar 210. Tongue 252 is urged downward toward washer holder 208 by a spring 256 which is captivated in channel 254, so that tongue 252 may extend over the rear edge of pivot plate 206 when surface 218 is aligned with surface 221 and thereby lock the pivot plate in the position shown in Figs. 4, 5 and 7. A pin 258 is attached to tongue 252 and is adapted to slide in an elongated opening 260 in retainer plate 255. Hole 260 is arranged so as to allow the tongue to be manually urged back (by means hereafter de~cribed acting against pin 258) against spring 256 far enough to be dis-engaged from pivot plate 206. When this is done the pivot plate will automatically rotate to the position sho~n in Figs. 8 and 9, due to the greater force of springs 248. The pivot plate may be rotated back to the position shown in Figs. 4 and 5 by forcing holder 208 to an upright tflat) position (Figs. 10 ànd 11) so.that -channels 216 and 238 align themselves and the force of springs 246 . exceeds the force of springs 248. The rear side of the protruding portion of the tongue is suitably bevelled to allow the tongue to yield inwardly under this action.
The washer dispenser is designed to operate as follows.
Assume that the mechanism is in a "load" position as shown in.Figs 4 and 5. In this state holder 208 is at an angle to bar Z10 and `25 . pivot plate surface 218 is substantially flush with the surface 221 of tracks 219. A plurality of washers 204 may then be fed int the top of channel 216, with gravity advanclng the washers downwar until pins 224 stop their advancement. Next the operator properly stimulates pin 258 (by means hereinafter described) to slide tongu , 252 out of engagement with pivot plate 206, thereby allowing springs 248 to rotate the pivo-t plate on rod 222 and bringing the mechanism to a "ready" position, as shown in Figs. 8 and 9. ~ur-HM~-65 ing this operation pins 224 are withdrawn from the path of the -- ~ .
~'' -11-11:
~ OSO~L ~
washers and pins 226 are projected into the path, thus allowing the washers to fall along rack 202 to their new position.
Finally, the dispenser is put in a "fir:ing" position by forcing holder 208 backwards into the position shown in Figs. 10 and 11 so that channel 238 becomes aligned with channel 216 and pivot plate 206 is rotated again by springs 246 so as to again place its pins 224 in washer~interceptiny position. As the plate rotates, pins 226 withdraw and the lead washer drops into counterbore 234, where it is retained by magnets 242 ready to be engaged by a fastener fired from driver 100.
Washer dispenser 200 is attached to driver 100 in the follow-ing manner. First a pair of support struts 280 are fastened to the nozzle 104 of driver 100, as shown in Figs. 1 and 14. Then dispenser 200 is screwed to support struts 280 via screws 282 (Fig. 4). Dispenser 200 mounts to driver 100 in such a manner that when holder 208 is pressed inwards for alignment with washer rack 202, holder 208 contacts nozzle 104 and bore 232 in holder 208 , , . ,,.. ~............... "" .~ . ,,.
lines up with the nozzle hole 181 (Fig. 11) of driver 100. A wear pin 286 (Figs. 4 and 11) is mounted in washer holder 203 for contac ting safety mechanism actuator rod 158 when holder 208 is forced backwards. ~
A handle assembly 300 is provided to facilitate the coordina-ted operation o~ driver 100 and washer dispenser 200, particularly in hard to reach places such as about the top edges of the large ~2~5 cast iron molds previously described. This handle assembly is shown in Figs. 1 and 12-15 and general]y comprises a pair of support bars 302, a palr of auxiliary suppor-t bars 304 and a handle 306. The lower ends of bars 302 are secured to ears 308 formed integral with the housing of driver 100 by means of a ?in 310. Bars 302 angle upwards away from the drlver, coming together near their upper ends and forming a single extension thereafter for attachment to handle 306. Auxiliary support bars 304 are in turn screwed to an ear 312 formed integral with the IH-65 lousing of driver 100 by means of a pin 314. Bars 304 extend , ~
~i -12-~13050~L
upwards away from the driver and are joined to bars 302 inter-mediate their length by a pin 316. Bars 304 serve to fi~ support bars 302 firmly in position relative to driver 100.
Elandle member 306 is a-ttached at i-ts top to the joined ends of rods 302 and a support strut 320 extends between one end of the handle and a support plate ~17 (Fig. 12~ which is mounted and secured to bars 302. A second support strut 321 extends between and is secured at its end to plate 317 and the washer magazine 200.
In addition, a hand grip 322 may be ~itted to support bars 302 above support strut 321.
Set into and pivotally mounted to handle member 306 is a trigger 323 which is adapted to activate the driver and washer magazine by means hereina~ter described. Referring now to Fig. 12, mounted to the underside of support plate 317 are two mounts 326 which slidably constrain a pin 328. A pair of connecting rods 330 and 331 joined by a turnbuckle 332 serve to link trigger 323 to pin 328 so that the latter will slide along mount 326 when the trigger is depressed. Pin 328 is in turn coupled by means o~
a pair of rigid support rods 332 (Figs. 1 and 13) to an actuator rod 333 which is pivotaily mounted between a pair of arms 334 (only one of which is shown) that are in turn pivotally mounted to bosses 336 formed integral with opposite sides of the driver housing by means o~ pivot pins 337. Rod 330 is located in light contact with trigger 160. Pin 328, rods 332, rod 333 and arms 334 are positioned such that when pin 328 is moved up by depressing trigger 323, rods 332 will cause rod 330 and arms 334 to pivot on pins 337, thereby driving actuator rod 333 against driver trigger 160 so as to depress the latter. When the pull on trigger 323 is released, the return action of driver trigger 160 will cause the linkage members to work in reverse, thereby restoring trigger 323 to its original position. In this way, trigger 323 can be used to effectively operate driver 100.
.
~3050~
......
As shown in E'ig. 14, also engaged with actuator pin 333 is a yoke comprising side sections 340 which are mounted so as to be supported by and to pivot about pin 310 as pin 333 is rotated and a body section 341 which is attached to and operates a link 342. The latter is pivotally connected to one end of a U-shaped lever 255 which forms part of activator mechanism 250. Lever 255 is pivotally attached to struts 280 by pins 281 and is positioned to engage pin 258 (Figs. 8 and 13) and serves to force the activator tongue 252 to slide upward along bar 210 each time trigger 323 is depressed. In this way, trigger 323 serves to activate washer dispenser tongue 252 as well as pneumatic driver 100.
The combined sub-assembly of pneumatic driver 100 r washer . magazine 200 and handle assembly 300 is intended to be weight-lessly support in mid-air by a hangar assembly 400, as shown in . Figs. 1 and 15. Attached to the inlet port 122 of driver casing ~ .,,.~ . . , s 102 is a rigid air pipe 402 which serves both to support the tool and deliver pressurized air to driver 100 via a fitting 404 which . is coupled by an air hose (not shown) to a suitable source of ~20 pressurized air such as an air compressor (also not shown).
Hangar assembly 400 comprises a block 403 which is affixed to and . connects pipe 402 and fitting 404, and a hangar member 406 that .
is secured to block 403 and serves as a connector to a cable 40~.
The latter is connected by an automatic balancing mechanism 410 . 25; and a second cable 411 to a suitable support assembly 412 which is adapted to permit the tool freedom.of movement in two directions in a horizontal plane. The balanciny mechanism .410 is a conven- -tional apparatus well known to persons skilled in the art, one H_65 -14-~, 1~ llao5ol ( I
form of whlch is sold commercially under the tradename AERO-MOTIVE
BAI,ANCE~ by Aero-Motive Mfg. Co. of Kalamazoo, Michigan.
Suffice it to state that cable ~08 is wound on a spring-biased drum or wheel forming part of balancing mechanism 410 and is capable of being extended or retracted when the force of gravi-ty on the tool is overcome by the operator pulling it down or pushing it up~ and of remaining in any given position when the operater releases the tool. If desired the mechanism 410 could be modified so as to automatically raise the tool to a preset height each time it is released by the operator.
The support assembly 412 may take various forms. By way of example but not limitation the support assembly may be a motorized crane. It also may be relatively light weigh-t so as to be perable by hand. Thus, the support assembly 412 may comprise pair of parallel rails 416 which are fixed and may, for xample, be suspended from the ceiling or roof structure of a teel mill, a main carriage 418 having wheels 420 and 422 which ide on rails 416, a secondary carriage 424 comprising wheels 26 which ride in a groove 428 in carriage 418, and a rigid epending yoke 430 which serves as a point of at-tachment for able 411. A third cable 432 is at-tached to yoke 430 and rovided with a suitable handle 434 at its bottom end. Cable 32 is used by the operator to move carriages 418 and 424 for he purpose of maneuvering the driver tool into the desired orking position.
The installation and operation of the tool will now be escribed. First the tool is mounted to its support assembly 12, and an air hose is coupled to fitting 404 so that the driver s suitable energized with compressed air. Then a fastener HMH-65 -15~
.- .
.
:. .
~ 5~
magazine loaded with a Eresh supply of fasteners is attached to the driver. Next the washer dispenser is manually put into its "load" position and a plurality of washers are fed into the top portion of the washer rack. The washers assume the position shown in Figs. 4 and 5. Now the operator pulls trigger 323 on the handle assembly so as to br:ing the washer dispenser mechanism to its ready position, thereby allowing the washers to drop into the position shown in Figs. 9 and 10. No fasteners are fired as this is done, since the driver's safety mechanism actuator rod 158 is not yet depressed.
The tool now is ready for use. The operator places ane hand on hand grip 322 and the other hand on handle 306 and posi-tions the nose of the tool against a workpiece as shown in Fig. 14.
In the case of preparing molds for casting steel ingots, the workpiece consists of an insulation liner 500 which is to be fastened to the inside surface 502 of a mold 504. Little effort is required to move the tool since the rail support assembly 412 allows horizontal freedom of movement and the automatic balancing mechanism 410 makes the tool appear substantially weightless to the operator. As the workpiece is engaged the washer holder 208 is forced inwards (as shown in Fig. 14) so it is aligned with the washer rack and a washer is thereby released from pins 226 of pivot plate 206 and advanced into the holder 208. This brings the dispenser to the fire position previously described. As this is done, safety mechanism rod 158 is simultaneously depressed by the rear side o-f holder 208 so that the gun is made ready to fire.
Now trigger 323 is depressed, whereupon a fastener is fired from the driver. The shank of the fired fastener passes through the 1~30501 ``
center hole of thç washer in holder 208 and the head of the fastener engages the washer, thereby carrylng the washer forward with the fastener to the workpiece. The fastener penetrates the insulation liner 500 and enters the side wall of the mold far enough for the head or the shan~ of the fastener to clamp the washer against the liner. The $rigger is maintained in a depressed position as the driver's recoil brings the tool away from the workpiece, with front holder 208 returning to its angular position (Fig. 5) and bringing the dispenser back to the ready state. Then the trigger is released, the toe of ~he tool brought against the workpiece again so the dispenser returns once more to its fire position, and another fastening is made.
This procedure is repeated until either the~fastener or washer magazine is depleted or the work is finished.
MODIFICATIONS OF THE INVENTION
.. . , It is understood that the preferred embodiment illustrated and described herein is intended as an example and lS not to be considered as limiting the scope of the present invention, since various alterations and modifications may be carried out on the illustrated embodiment without departlng from the essential features of the invention. In this connection reference is had to Figs. 16 and 17 where the washer dispenser apparatus and certain parts of the driver have been modified to illustrate another contemplated design. The modified dispenser 200A comprises a vertical rack 506, a channel 508 disposed in rack 506, a first bore 510 disposed in channel 508, and a flange ' '' . .
~ 65 - -17-. .
, --~
11;~05~
512 having a semi-circular lnner surEace 514 that is concen-tric with bore 510. Flange 512 has a hole 516. Channel 508 has a cross-section substantially the same as the groove 216 shown in washer dispenser 200 and serves to slidably constrain a plurality of washers 204 along rack 506. The inner surface 514 of flange 512 forms an end wall for channel 508 and serves to help position washers which are gravity fed from the upper part of rack 506. The curvature of surface 514 is made so that it is slightly greater than the correspondin~ outer dimension of washers 204 and so that its ends are flush with the sides of channel 508 as shown. A pair of magnets 518 are set in rack 506 for holding washers 204 in alignment with bore 510. A pin 520 is embedded in rack 506 along its center line in surface 514 to - absorb the force of the gravity-fed washers. Bore 510 has a diameter somewhat greater than the maximum diameter of a fastener.
Driver nozzle 104 and safety mechanism actuator rod 158 are modified slightly as shown in Fig. 17. More specifically, a slot 526 is cut into nozzle 104 and rod 158 is formed with an off-set 159. Rack 506 is mounted to driver 100 by screws 282 and is seated so that bore 510 is aligned with the nozzle hole 181 and the safety mechanism actuator rod is directed out through slot 516.
The modified washer dispenser is intended to operate as follows, First a pl~lrality of washers 204 are loaded into the top of rack 506, with gravity feeding them downwards along groo~e 508 until the bottom washer seats against pin 520. The ends of curved surface 514 of flange 512 limit sidewise movement of the washer and thus coact with pin 520 to center the washer on the hole 510. Magnets 518 serve to hold the washer in place, with ' ~ ,:
~ 51)~L
~ashers along the remainder of rack 506 being supported ~y the bottom washer. Next the fastener tool is positioned against a workpiece so that safety mechanism actuator rod 158 is pressed inwards and the driver made ready to fire. Then the trigger 323 is pulled and a fastener is fired from the driver. ~he fastener exits from nozzle 104 and engages the bottom washer and carries it from the rack to the workpiece. ~s this is done the remaining washers are dropped downwards b;y gravity until the lowest one assumes a position against stop pin 520. The tool is then ready for use once again.
Other changes are also possible. One such change might be to use one long rod to couple tri~ger 323 to pin 330, instead of the mechanism now employed. Another change might be to change the tools' support means to a different form. These and other changes of their type are foreseen as readily obvious to one skilled in the art.
. .
ADVANTAGES OF THE PRESENT INVENTION
There are numerous advantages to using the present invention rather than existing tools. F1rst, the tool is pneumatically operated and therefore avoids all the undesirable characteristics of explosive-activated drivers ~.e.g. nolse, recoil, smoke, safety problems, slowness of operation, etc.). Second, the tool is adapte to automatically deploy a washer from a washer magazine with each fastener, without the need to manually load a preassembled washer~
pin into a holder before each fastening. Operator productivity is thereby increased. ~hir~, the tool is provided with a handle . ' ' . " , .
HMH-65 ~ -19-.
. .
~ S~
extension to facilitate its use around hard to reach places, such as about the top of the cast iron molds previously mentioned.
Fourth, the tool is provided with ~ hangar assembly which makes it relatively weightless to an operator. Fifth, because the flange or toe 236 is made thicker than the rest of holder 208, the latter will always be sure to be deflected to the position shown in FigsO 11 and 14 when brought into contact with the workpiece even though the workpiece may not be fully flat.
Sixth only one washer is fed at a time, thereby avoiding jamming of the tool. Seventh, the tool cannot be fired until it is engaged with a work-piece. A further advantage is that the washer dispenser may be eliminated and the magnets 242, 518 or other suitable washer retaining means may be mounted directly to the end surface of tool nozzle 104, whereby washers may be manually attached to the tool in position to be picked up by a nail as it leaves the nozzle and enters a workpiece.
The tool of Figs. 1-13 may be modified by omltting the magnets 242 since the washers a~ not on the pivot plate until the latter is engaged with the workpiece. Also if after a washer drops onto the pivot plate 206, the tool is retracted from the workpiece without being fired, the washer on the pivot plate will be retained in place by gravity (note that pivot plate 206 is at an angle when it is not forced back by engagement with a workpiece). Still other advantages will be obvious to persons skilled in the art.
.
Claims (16)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A portable fastener driving tool comprising:
a hollow housing having first and second ends;
first end means for closing off said first end of said housing, said means having a first opening therein for com-municating with the interior of said housing;
a hammer longitudinally disposed within said housing and movable lengthwise along said first opening in said first end means between a first retracted position and a second extended position;
means for driving said hammer from one to the other of its first and second positions, at least some of said means for driving said hammer being disposed within said housing;
means for positioning a fastener where it may be engaged by said hammer so as to be driven from said first opening in said first end means; and part support means including a member mounted in fixed relation to said housing and magnet means for magnetically supporting a metal part to be fastened in front of said opening, said part support means being engageable with a work surface and adapted to allow a fastener discharged from said opening by said hammer to penetrate said metal part and transport said metal part away from said part support means; and a safety mechanism comprising a movable actuator rod for enabling said tool when the part support means is engaged with a workpiece.
a hollow housing having first and second ends;
first end means for closing off said first end of said housing, said means having a first opening therein for com-municating with the interior of said housing;
a hammer longitudinally disposed within said housing and movable lengthwise along said first opening in said first end means between a first retracted position and a second extended position;
means for driving said hammer from one to the other of its first and second positions, at least some of said means for driving said hammer being disposed within said housing;
means for positioning a fastener where it may be engaged by said hammer so as to be driven from said first opening in said first end means; and part support means including a member mounted in fixed relation to said housing and magnet means for magnetically supporting a metal part to be fastened in front of said opening, said part support means being engageable with a work surface and adapted to allow a fastener discharged from said opening by said hammer to penetrate said metal part and transport said metal part away from said part support means; and a safety mechanism comprising a movable actuator rod for enabling said tool when the part support means is engaged with a workpiece.
2. A fastener driving tool according to claim 1 wherein said part support means comprises means for slidably supporting in an edge-to-edge fashion a plurality of metal parts to be fastened and sequentially positioning said metal parts in front of said first opening so that only one of said metal parts at a time is positioned in front of said first opening.
3. A fastener driving tool according to claim 2 wherein said part support means comprises a rack having first and second opposite ends, a rear side facing said first end means, a front side facing away from said first end means, a longitudinal groove open on the front side of said rack for slidably containing said metal parts along said rack and delivering them at said first end of said rack, a hole in said first end of said rack, and stop means on the front side of said rack for intercepting one of said metal parts sliding along said groove so that said metal part will stop in front of said hole in said rack, said rack being disposed so that the said hole in said rack is aligned with said first opening in said first end means and said magnet means being attached to said rack in position to hold a metal part in front of said hole.
4. A fastener driving tool according to claim 1 wherein said part support means comprises (a) a rack having first and second opposite ends, a rear side facing said first end means, a front side facing away from said first end means, and guide means for slidably constraining a plurality of metal washers along said rack in edge-to-edge relation and delivering them in series at said first end of said rack, (b) a gate mechanism attached to said rack for individually dispensing said washers from said first end of said rack, and (c) a holder adjoining said first end of said rack and adapted to receive said washers from said rack and hold said washers one at a time in front of said first opening so that each washer's center hole is substantially aligned with said first opening, said center hole being sized smaller in diameter than the maximum diameter of said fastener and said holder being provided with a central aperture for alignment with said first opening and able to pass a fastener therethrough, said part support means also being adapted to (a) allow said fastener to engage said one washer after said fastener leaves said first opening in said first end means, (b) release said one washer after said one washer is engaged by said fastener, and (c) position another washer in front of said first opening after deployment of said one washer.
5. A fastener driving tool according to claim 4 wherein said holder is pivotably mounted to said rack and is adapted to receive washers from said rack only when said holder is aligned co-planar with said rack with said central aperture being aligned with said first opening.
6. A fastener driving tool according to claim 5 wherein said holder comprises a channel and a front counterbore, said counterbore communicating with said channel and said central aperture and being large enough to accommodate a washer, and said channel being adapted to transport washers one by one from said first end of said rack to said front counterbore.
7. A fastener driving tool according to claim 6 wherein said holder is provided with at least one magnet for holding one washer firm in front of said first opening.
8. A fastener driving tool according to claim 4 wherein said gate mechanism comprises a pivot plate mounted in an opening in said rack at said first end of said rack and adapted to pivot on an axis perpendicular to said longitudinal axis of said rack, said pivot plate having first and second front surfaces and said front surfaces being provided with first and second stop means respectively for interfering with washers sliding along said rack as said pivot plate is pivoted so that (a) when said first stop means is advanced into the path of said washers, no washer may advance past said first stop means and said second stop means is fully withdrawn from the path of the washers, and (b) when said second stop means is advanced into the path of said washers t no washer may advance past said second stop means and said first stop means is fully withdrawn from the path of said washers.
9. A fastener driving tool according to claim 8 wherein rotation means are provided to cause said pivot plate to pivot and thereby advance said first or second stop means into the path of washers carried by said rack, said rotation means comprising first spring means extending between the holder and the pivot plate, a second spring means extending between said rack and said pivot plate, whereby (1) when said holder is aligned co-planar with said rack, the force exerted by said first spring means on said pivot plate exceeds the force exerted by said second spring means on said pivot plate and said first stop means is thereby advanced into the path of said washers, (2) when said holder is not aligned co-planar with said rack, the force exerted by said second spring means on said pivot plate exceeds the force exerted by said first spring means on said pivot plate and said second stop means is thereby advanced into the path of said washers, and further including means for selectively locking said pivot plate with said first stop means in the path of washers on said rack.
10. A fastener driving tool according to claim 1 wherein said housing is mounted on a handle assembly for positioning said tool, said further wherein said handle assembly includes means for activating said means for driving said hammer and said gate mechanism in a coordinated fashion.
11. A fastener driving tool according to claim 2 wherein said housing is mounted on a handle assembly for positioning said tool, said further wherein said handle assembly includes means for activating said means for driving said hammer and said gate mechanism in a coordinated fashion.
12. A fastener driving tool according to claim 10 or 11 wherein said handle assembly is mounted to an automatic balancing mechanism so as to suspend said tool relatively weightless.
13. A tool according to claim 2 wherein said actuator rod for enabling said tool is disposed so as to be forced by the holder to enable the tool when the holder is engaged with a workpiece.
14. A fastener driving tool according to claim 3 wherein said rack extends at substantially a right angle to the path of movement of said hammer, whereby when the tool is oriented so that the axis of the hammer is horizontal, gravity will urge parts to advance along said rack to said stop means.
15. A fastener driving tool according to claim 4 wherein said rack extends at substantially a right angle to the path of movement of said hammer, whereby when the tool is oriented so that the axis of the hammer is horizontal, gravity will urge said washers to advance along said rack to said gate mechanism.
16. A fastener driving tool according to claim 4 further including an extension handle assembly attached to said housing for supporting and positioning said tool, said handle assembly including selectively operable means remote from said housing for actuating said means for driving said hammer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US92729678A | 1978-07-24 | 1978-07-24 | |
| US927,296 | 1978-07-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1130501A true CA1130501A (en) | 1982-08-31 |
Family
ID=25454533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA318,217A Expired CA1130501A (en) | 1978-07-24 | 1978-12-19 | Pneumatic tool |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS5516795A (en) |
| AU (1) | AU527379B2 (en) |
| CA (1) | CA1130501A (en) |
| DE (1) | DE2906330A1 (en) |
| FR (1) | FR2431906A1 (en) |
| GB (1) | GB2025829B (en) |
| IT (1) | IT1113484B (en) |
| MX (1) | MX147906A (en) |
| SE (1) | SE433719B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4346831A (en) * | 1980-01-09 | 1982-08-31 | Haytayan Harry M | Pneumatic fastening tools |
| JPS6334785Y2 (en) * | 1981-02-09 | 1988-09-14 | ||
| DE8112241U1 (en) * | 1981-04-24 | 1981-09-17 | Esco Metallwaren, Martin Hühnken, 2072 Bargteheide | FASTENER FOR FASTENERS |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE924439C (en) * | 1940-06-30 | 1955-03-03 | Siemens Ag | Suspension device for power tools |
| CH365349A (en) * | 1962-01-30 | 1962-10-31 | Baechli Emil | Suspension device for hand-held electric hammers and hand-held pneumatic hammers |
| US3272267A (en) * | 1963-10-21 | 1966-09-13 | Signode Corp | Walking stick for fastening tool |
| US3310215A (en) * | 1964-02-11 | 1967-03-21 | Louis D Bostick | Overhead stapling machine |
| DE1957746C3 (en) * | 1967-02-13 | 1976-01-02 | Chicago, Ill. (V.St.A.) | Driving device for fasteners |
| DE2109537A1 (en) * | 1971-03-01 | 1972-09-07 | Itw Ateco Gmbh | Device for nailing cable clamps or the like |
| DE2240233A1 (en) * | 1972-08-16 | 1974-02-28 | Signode Corp | DEVICE FOR FEEDING WASHER |
| US4033499A (en) * | 1975-10-20 | 1977-07-05 | Butler David J | Fastener applicators |
-
1978
- 1978-12-19 CA CA318,217A patent/CA1130501A/en not_active Expired
- 1978-12-22 GB GB7849852A patent/GB2025829B/en not_active Expired
- 1978-12-27 SE SE7813315A patent/SE433719B/en not_active IP Right Cessation
-
1979
- 1979-01-05 AU AU43161/79A patent/AU527379B2/en not_active Ceased
- 1979-01-22 IT IT47725/79A patent/IT1113484B/en active
- 1979-02-19 DE DE19792906330 patent/DE2906330A1/en not_active Withdrawn
- 1979-02-23 JP JP1988979A patent/JPS5516795A/en active Pending
- 1979-04-19 FR FR7909955A patent/FR2431906A1/en active Granted
- 1979-06-13 MX MX178050A patent/MX147906A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE2906330A1 (en) | 1980-02-14 |
| FR2431906B1 (en) | 1984-12-14 |
| GB2025829A (en) | 1980-01-30 |
| MX147906A (en) | 1983-01-31 |
| SE7813315L (en) | 1980-01-26 |
| AU527379B2 (en) | 1983-03-03 |
| AU4316179A (en) | 1980-01-31 |
| IT7947725A0 (en) | 1979-01-22 |
| GB2025829B (en) | 1982-07-21 |
| IT1113484B (en) | 1986-01-20 |
| SE433719B (en) | 1984-06-12 |
| JPS5516795A (en) | 1980-02-05 |
| FR2431906A1 (en) | 1980-02-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |