US3042925A - Hand nailer - Google Patents

Description

July l0, 1962 1 FRosTAD ET A1.

HAND NAILER 6 Sheets-SheeiI 1 Filed Dec. 5, 1959 mv md INVENTORS Lars 'osfad Hei/ro T. de Man l. 3mm# @aman ATTORNEY July 10, 1952 l.. FRosTAD ET AL 3,042,925

HAND MAILER Filed Deo. 3,v 1959 6 Sheets-Sheet 2 INV ENTORS Lars Pros/ad He/7r0 7.' deMan .fmma# ompam ATTORNEY July 10, 1962 l.. FRosTAD ET AL HAND NAILER 6 Sheets-Sheet 3 Filed Dec. 3, 1959 INVENTORS ,Lars Frosfad Hel/ro 7. deMan 5mn# W ATTORNEY July 10, 1962 l.. FRosTAD ETAL 3,042,925

HAND NAILER ,Filed Dec. 3, 1959 6 Sheets-Sheet 4 INVENTORS Lars Froslad Hei/ro 7.' de Man ATTORNEY July 10, 1962 l.. FRos-rAD ETA.

HAND NAILER 6 Sheets-Sheet 5 Filed Dec. 5, 1959 IIO INVENTORS Lars Frosted Hei/ro 7.' de Man nme# ampdan ATTORNEY 6 Sheets-Sheet 6 INVENTORS Lars F rosfad Heiko 7.' deMan nme# M404 ATTORNEY July 10, 1962 L. FRosTAD ETAL HAND MAILER Filed Deo. .3, 1959 IIG Ebates This invention relates to nail drivers of the type wherein nails are automatically and successively fed to a nail discharge passage, the nails being driven through the discharge passage into the work piece by downward movement of a plunger and nail driving blade carried thereby, the downward movement of the plunger being effected by being struck by a hammer, or mallet.

Nail drivers of this type are used, for example, in the laying of hardwood floors. They are equipped with magazines containing a substantial supply of nails, all whereby the nails are driven more rapidly in the most suitable part of rthe work piece, or floorboard, and are driven with lessefort.

This structure has as an object a nail driver embodying a magazine structure which is convenient to load and which functions efliciently to successively deliver nails to the nail delivery passage.

The invention has as a further object a full stroke mechanism to prevent upward or return movement of the driving plunger until the nail being driven has been driven home, this mechanism embodying a structure which is entirely reliable and free from maintenance, and economical to construct.

The invention consists in the novel features and in the combinations and constructions hereinafter set forth and claimed.

In describing this invention, reference is had to the accompanying drawings in which like characters designate corresponding parts in all the views.

In the drawings- FIGURE 1 is a side elevational view of a nail driver embodying our invention.

FIGURE 2 is a view, similar to FIGURE 1, with one side of the body broken away, and one side of the nail magazine removed, and with the forward or head portion of the device shown in vertical section.

FIGURE 3 is a comparable view to the upper right portion of FIGURE 2 but showing the driving plunger in down position.

FIGURE 4 is a view, similar to FIGURE 3, showing the plunger in partially downward position.

FIGURE 5 is a transverse sectional View taken on a line corresponding to line 5 5, FIGURE 2.

FIGURE 6 is a side elevational view with one side of the body broken away, the magazine being shown in side elevation and positioned in the magazine chamber.

FIGURE 7 is a View, similar to FIGURE 6, with the magazine moved to open loading position.

FIGURE 8 is a front end elevational view of the shear FIGURE 13 is an elevational view of the lower por-V tion of the front surface of the plunger, and

FIGURE 14 is a top plan view of the pawl employed in the full stroke mechanism.

icc

The nailer consists of a body formed of two similar parts 20, 21, formed at their forward ends with upwardly extending projections 22, 23, to provide a head portion. The parts 20, 21, extend rearwardly from the head portion to a rear portion 25, which curves upwardly and forwardly to form a handle 26. The body parts 20, 21, are spaced apart throughout their intermediate portions to form a magazine receiving chamber 27 extending rearwardly from the head portions 23 to the rear portion 25. This chamber 27 is for the reception of a nail magazine which is here shown in the form of two similar parts 30, 31, the upper edges of which are formed with flanges 32 secured together as by rivets 33 forming a top rib projecting upwardly between inwardly extending flanges '36, see FIGURE 5, formed on the upper edges of the body parts 20, 21.

'I'he confronting sides of the parts 30, '31, are formed with grooves 37 to receive the heads 38 of the nails 40, the nail heads being supported on ribs 41. Below the ribs 41, the parts 30, 31, are formed with rectangular grooves 43 of substantial dimension to provide a rectangular passageway 44 to slidably receive a pusher 45. The bottom walls of the grooves 43 terminate in spaced apart relation to provide a slot for the passage of a handle 46 which is bent to extend laterally through a slot 47 formed in the body piece 20', the handle havingV a cylindrical portion 48 extending laterally from theside of the body with which the pusher 45 can be conveniently retracted, or moved rearwardly, against the action of a spring 50' which extendsV rearwardly up into the handle portion 26, see FIGURE 2, and is captivated by a plug 51. vThe pusher 45i'and spring 50 serve to yieldingly advance the nails 40 forwardly along the guideway toward the head portion.

The forward end of the magazine'is mounted upon pivot pins 52 in the form of dog point screws threaded into the body members 20, 21. The forward ends ofthe magazine parts 30, 31, are inclined, as -at 55, to permit the magazine to be moved downwardly about the pivot 52 to the open position shown in FIGURE 7. The pusher 45, when retracted to the rear portion 25, is retained in retracted position by a latch 57 pivoted in the body parts, as at 5S, and 'having a hook end 59 engaging a downwardly extending projection 60 on the under side of the .pusher 45. The latch is urged to latching position by a spring 61, see FIGURES 6 and 7.

' Means is provided for detachably holding the magazine in the chamber 27. As shown in FIGURES 2, 6 and 7, a latch pin 63 is mounted in the rear body portion 25 for axial movement, the pin being urged forwardly by a compression spring 64 to position the forward end of the pin into the upper portion 37 of the nailguide plate. -This effects a releasable means for holding the magazine in the magazine receiving chamber and with the nail guideway arranged in alignment with the nail discharge passage hereinafter referred to. The latch pin 63 is formed with a collar 67 against which the spring 64 acts. The pusher 45 is formed with an upwardly extending projection 68 so arranged that when the pusher is moved to retracted position, as shown in FIGURES 6 and 7, the projection 68 engages the collar 67, moving the latch pin 63 rearwardlyl out of engagement with the magazine. `The latch 57 is released from the pusher by pressing inwardly on the tail portion 69 of the latch 57.V In order to prevent accidental release of the pusher when the magazine is in the loading position sh'own in FIGURE 7, the rib portions 32 of the magazine parts are formed attheir rear ends with upwardly extending projections 70 and are so dimensioned that when the magazine is in open position, the projections 70 provide an interference to prevent forward movement of the pusher 45. For devices of this type, the nails are usually severally attachedl together by glue, so that the nails are handled in stick form for loading the magazine.

The forward ends yof the - body parts 20, 21, terminate short ofthe forward edges, ofthe .upwardly extending projections 22, 23, `and there isY positioned on the forward ends of the tbody parts` a shear plate '72, V,This plate is Y Vformed with a slot 73 extending upwardly from its lower edge andV communicating -with an elliptical shaped aperk `ture 74. The upper portions of the magazine slide'parts 30, 31, above the recess 44, extend forwardly as at 75 parts 20, 21, and extending along thepside edges of the t plate 72. The nose piece S1 is iixedly secured to the members 20, 21, by screws 83v extending through apertures 84 in the shear plate and being lthreaded into the members 20, 21. The nose piece is formed with the vertically disposed nail delivery passage 80. Y

VThe upwardly extending portion, vformed by the prtions 22, 23, of the body members, is formed with a square passageway in which there is mounted two U-shaped members 86, 87, having theirY side flanges abutting and being formed of wear resistant metal to provide a bushing in which the plunger 88 is slidably mounted. The plunger isformed on opposite sides with lengthwise extending recesses 89. Thermembers 22, 23, are formed to provide `vertically elongated apertures 90 which extend transversely of the axis of the plunger 88 andr communicate with grooves 91 extending inla direction axially of theplunger in adjacency to the bushing members 86, 87. Members V93 are slidably mounted in the vrecesses 91. The lower ends of these members are provided with transversely extending threaded apertures to receive screws 94, the lheads of which are positioned in the apertures 90, the screws having inner portions 95 of reduced diameter extending into the grooves 89 formed'in the sides of the plunger-88. These screws terminate short of the `lbottom whereby, when Ythe plunger is in the up position as shown in FIGURES 1 and 2, the inner ends 95 ofthe screws 94V are-engaged bythe bottom of the slots 89'. AThe members or blocks 93 4are slidably mounted in the recesses 91 and are urgeddownwardly by compression 'springs 97. This Y arrangement provides a yieldable bumper when the plunger is returned to up position by the compression This structure consists in the plunger 88 being formed on its rear side with a surface 116 confronting a pawl 108 mounted in the head portion 23 o-f the machine. The surface 116 has a vertical or lengthwise dimension of the plunger such that it is engaged by the pawl when the plunger is intermediate itsV up `and down positions. The lower-end vof this surface 1,16y is dened by a recess 104, and the upper end of the 'surface is defined by a recess 106. As illustrated inFIGURE 2, with the plunger 88 in its up position, the surfacel 116 is, positioned albove the pawl and, as illustrated in FIGURE 3with the plunger in its down position, the surface 116 :is positioned below the pawl.

The body members 22, 23, are formed in their confronting sides in the head portion'of the machine with concavitiesY 107 in which the pawl 108 is mounted. This pawl is formed with trunnions 109, see FIGURE 14, journalled in bushings 110. This pivot point is spaced laterally from the surface 116 of the plunger 88 such that the free end 111,of the pawl will engage the surface 116 prior to thepawlV assuming a position normal to the plunger. In other words, the'engagement of the pawl with surface 111 is cant-fashion, as shown in FIGURE 4.

spring 98 which encircles a guide rod 99, the spring rex- 'i tending upwardly in an axially extending hole 100 formed in the plunger' 88.

The forward side of the plunger 88, see FIGURE 13, is formed at .its lower end` with la groove 101 extending upwardly Vvfrom the lower-'edge of the plunger'and communicating with a circular recess .102. 1y A nail driving Vblade 103 is formed lat its upper end complemental to the Y' recesses 101,102, and depends from the plunger with the lower end of the lblad'e 103 positioned just above the nail .delivery passage 80'whe'n the plunger is in its up'position,

see FIGURE 2. When the plunger 88 reaches the bottom of its strokethe lower end of the blade 103is positioned which might result .in the next nail in the magazine being jammed in the passage A80 partially oocupiedpby the partiallydriven nail. Y v

As illustrated in FIGURES 2, 3 and 4, the pawl 108 is urged toa position normal to the axis of the plunger by leaf springs 112 positioned'in the recess 107, the pawl being shown in such position in FIGURE 4.

As the plunger moves downwardly, the lower edge of the surface 116 engages the pawl and moves it downwardly 4about its pivot 109,- the plunger passing freely downwardly. However, the vpawl has now been canted, as shown in FIGURE 4, whereby any retrograde or upward movement of the plunger is prevented by the pawl. When the plunger has reached the bottom of its stroke Iand the nail has been driven home, the surface 116 has passed belowA the :area in whichthe pawl is mounted and the upper recess 105 yprovidesspace for the pawl to again assume position normal to the plunger. The pawl does `not interfere with upward return movement of the plunger from its downrposition. As the plunger moves upwardly under thev inuence `of the spring 98, the free inner end of the pawl will be engaged by the upper end of the surface 116, .and the pawl will be oantedgupwardly so Jthat it does not bind the plunger upon its upper return movement.

. In the modified form shown in FIGUREV l5, the pawl is pivotally mounted in a bearing yieldingly mounted in the machine for movementin adirection laterally from the plunger 88. Such an arrangement can be economically provided Yby mounting the bearingybushing 110 in a block 118 of yieldable material such as rubber. The block 118 is mounted in concavities 119 ysimilarly located tothe concavities 107 in the arrangement previously described. This block 118 mayfalso function to yieldingly urge the pawl 108 in position normalto the axis Vof the plunger, this being accomplished Y,by forming the block 118 with upperV andlower lip portions 1,20 extending inwardly toward the plunger for engaging the pawl after the manner Y of the springs'112 in FIGURE 4. This pivotal mounting of the pawl for yielding movement in a direction away from the plunger avoids the precision machining and mounting of the pawl pivot as in the4 arrangement shown in FIGURES 2, 3 and4. VThis yielding movement of the pawl pivot also provides for the releasement of the pawl in the event i-t should become jammed against the plunger. The yieldable mount being suflcient for the full stroke control' of the plunger in normal operation but being yieldable to release the plunger inthe event of jamming.

In operating Vthe nailer, the pusher 45 is'moved to the rear portion 25 of the body by means of the handle 48. The pusher is retained in this rear portion by the latch 57. This movement of the pusher into latched position re- =leases the restraining pin 63 whereupon the magazine may be moved downwardly out of the body about the pivot 52 to the position shown'in FIGURE 7. In` this position, a row of nails can be conveniently inserted in the guideway of the magazine. The magazine is then moved into the body and the pusher released by pressing upwardly on the tail portion 69 of the latch 57.

The pusher is advanced forwardly against the row of nails by the spring 50, and forward movement of the pusher releases the retaining member 63 for engagement with the rear end of the magazine, thus restraining movement of the magazine out of the body. The nails are driven by blows applied by the knob 114 on the blade driving plunger.

We claim: l

l. A nail driver comprising an elongated body having an upwardly extending head portion at its forward end and a rearward portion, said head portion being formed with a nail delivery passage, said body being formed with an elongated chamber extending rearwardly from said head portion to said rear portion, a nail magazine movable into and out of said chamber and having a nail guideway in registration and communicating with said delivery passage when said magazine is positioned in said chamber, a pusher slidably mounted in said guideway, a spring for urging said pusher along the guideway toward said head portion to advance a row of nai-ls along the guideway toward said delivery passage, releasable means for restraining movement of said magazine out of said chamber, said pusher being retractible from lsaid magazine into said rear portion of the body, and releasable latch means for holding said pusher in retracted position in said rear portion of the body.

2. A nail driver comprising an elongated body having an upwardly extending head portion at its forward end and a rear portion, said head portion being formed with a nail delivery passage, said body being formed with a magazine receiving chamber extending rearwardly from said head portion to said rear portion, a nail magazine moveable into and out of said chamber and having an elongated nail guideway in registration and communicating with said delivery passage when said magazine is positioned in said chamber, a pusher slidably mounted in said guideway, a spring for urging said pusher forwardly along the guideway toward said head portion to advance a row of nails along the guideway to said delivery passage, said pusher being retractible from said magazine into said rear portion of the body, means carried by -said rear por- -tion and movable into engagement with said magazine to retain the same in said chamber, a releasable latch means mounted in said rear portion and movable into latching engagement with said pusher for holding the same in retracted position, said pusher being operable in retracted position to move said magazine retaining means out of engagement with said magazine.

3. A nail driver comprising an elongated body having an upwardly extending head portion at its forward end and a rear portion, the intermediate portion of `said body being formed with an elongated magazine receiving chamber, said head portion being formed with a nail delivery passage, a nail magazine pivotally secured at its forward end to said head portion for movement about said pivot into said chamber and out of said chamber toloading position, said magazine having a nail guideway aligned and communicating with said nail delivery passage when the magazine is moved into said chamber, a pusher slidably mounted in said nail guideway, and a spring cooperating with said pusher for urging the same forwardly along the guideway toward said head portion to advance a row of nails along the guideway for delivery Ito said delivery passage, said pusher being retractible from said magazine into said rear portion of the body, said magazine having means operable when the same is moved to outward loading position to prevent forward movement of said pusher from said rear portion ofthe body.

4. A nail driver comprising a body having an upwardly extending head portion at its forward end formed with a nail delivery passage, a magazine structure for feeding nails to said passage, a plunger slidably mounted in the head portion and having la depending nail driving blade for movement `downwardly through said passage upon downward movement of the plunger to down position to drive a nail through said passageinto a work piece, a. spring for effecting an upward return movement of said plunger to its up position, -a bearing mounted in said head portion for lateral movement in a direction from said plunger, means yieldingly restraining such lateral movement of said bearing, a pawl pivotally mounted at one end in said bearing and extending toward said plunger, said plunger having a side surface confronting said pawl when said plunger is intermediate its up and down positions, said bearing being spaced a distance from lthe plane of said surface less than the length of said pawl, such that the free end of the pawl will engage said surface cant fashion and means yieldingly urging said pawl in position normal to said plunger when said plunger is in its up and down positions.

References Cited in the tile of this patent UNITED STATES PATENTS 288,191 Young Nov. 6, 1883 1,048,522 Gibson Dec. 3l, 1912 2,059,021 Pankonin Oct. 27, 1936 2,423,821 Anstett July 15, 1947 2,430,321 Anstett Nov. 4, 1947 2,768,376 Critchley Oct. 30, 1956 2,781,515 Juilfs Feb. 19, 1957 2,931,038 Wandel Apr. 5, 1960

Images