US2938213A

US2938213A - Automatic hand-nailer

Info

Publication number: US2938213A
Application number: US607829A
Authority: US
Inventors: Gorn Walter Frans Heinz
Original assignee: CANADIAN FABRICATED PRODUCTS L
Current assignee: CANADIAN FABRICATED PRODUCTS L; CANADIAN FABRICATED PRODUCTS Ltd
Priority date: 1956-09-04
Filing date: 1956-09-04
Publication date: 1960-05-31
Anticipated expiration: 1977-05-31

Description

May 3l, 1960 w. F. H. GoRN AUTOMATIC HAND-NAILER 8 Sheets-Sheet 1 Filed Sept. 4, 1956 May 31, 1960 w. F. H. GoRN AUTOMATIC HAND-NAILER 8 Sheets-Sheet 2 Filed Sept. 4, 1956 Inventor WALTER FRANZ HE /NZ @ORN Bymmm A ys.

May 31, 1960 w. F. H. GoRN 2,938,213

AUTOMATIC HAND-NAILER Filed Sept. 4, 1956 8 Sheets-Sheet 3 FIG. 2d.

May 31, 1960 w. F. H. GoRN AUTOMATIC HAND-NAILER 8 Sheets-Sheet 4 Filed Sept. 4, 1956 FEC-3.6

inventor WALTER FRA/VZ HEINZ 60E# May 31, 1960 w. F. H. GRN

AUTOMATIC HAND-NAILER 8 Sheets-Sheet 5 Filed Sept. 4, 1956 May 3l, 1950 w. F. H. GoRN 2,938,213

AUTOMATIC HAND-NAILER Filed Sept. 4, 1956 8 Sheets-Sheet 6 Y lnvzntor O w/ WALTER FRANZ HEINZ GORI( BWM/ Atty

May 31, 1960 w. F. H. GoRN AUTOMATIC HAND-NAILER 8 Sheets-Sheet '7 Filed Sept. 4, 1955 Flc. lo

Inventor WAL TER GR/v Att'ys May 31, 1960 w. F. H. GoRN 2,938,213

AUTOMATIC HAND-NAILER Filed Sept. 4, 1956 8 SheeiS-Sheet 8 2 l LL Q ,n LL

Inventor WA TER FRA/VZ AIE/N5 GDR/V AUTOMATIC HAND-NAILER Walter Frans Heinz Grn, Stratford, Ontario, Canada, assignor to Canadian Fabricated Products Limited, Stratford, Ontario, Canada Filed Sept. 4, 1956, Ser. No. 607,ti29

3 Claims. (Cl. 1-46) This invention relates to a nailing machine.

The nailing machine comprises a means for holding nails to be driven, a mechanism known as the driving assembly including a surface adapted to contact the head of said nail and to drive it into material to be nailed, a means for intermittently supplying nails to the path of said surface, `known as the nail supply means synchronized with 'ie motion of said driving assembly in driving the nails into the material as supplied.

It is an object of this invention to provide means for ensuring that only one nail at a time is fed to the path along which the nail is driven, hereinafter referred to as the driving rod path.

It is a further object of this invention to provide `a reciprocating conveyor member which oscillates in a direc- I tion between the driving rod path and the nail supply, oscillating between limit positions known as remote and adjacent positions.

lt is an object of this invention to provide means for synchronizing the movement of the nail driving mech anism with the reciprocating `conveyor in such a way that a nail is moved into the path of the driving rod after each nail is driven.

It is also an object of this invention to provide a support surface for the nail before and during the striker operation, wherein the surface slopes inwardly and downwardly relative to the driving rod path to Contact the nail at its head and adjacent the point thereof to support it in alignment with the driving rod, wherein the nail is attracled and held on said support by magneticforce and wherein the support surface is releasably biased into the position described above to be moved out of this position by the downward motion of the driving rod.

lt is also an object of this invention to provide apparatus of non-magnetic material within the effective ux path of the magnetic nail rholder so that the ilux will not be distorted.

In the drawings:

Figure 1 shows a perspective view of the nailing machine with the upper casing removed;

Figure 2 shows the side view of the nail with the conveyor removed;

Figure 2a shows a view taken along lines 2 Figure l-;,

Figures 3 to 6 show a series of top views illustrating the nail conveyor operation;

Figure '7 shows a perspective view of the conveyor;

Figure 8 is a section of the operating means for the striker and driving rod.

Figure 9 is a section similar to Figure S, in operating position;

Figure 9a is a View at right angles to the view of Figure 9;

Figure l shows the support surface, magnetic element and slot;

Figure 10a shows the support being a view along the line '19a- 16a of Figure 3;

2a of sov [le l im Patented lt'lay 3l, ld@

Figures l1 and 12 are sections taken along the same locations as are Figures 8 and 9 but showing different operative stages in the driving of a nail;

Figure 13 is a side view at right angles to the view of Figure 12.

ln the drawings an upper casing 10 supplies a mounting tor block 18 to which is connected a motor 12. integral with the casing and rigidly connected to the block 18 is a pair ot handles 11 and 13 for easy manual operation of the machine. From the motor 12 extends a shaft 14 on which are mounted a pair of Spiralling step carri wheels t6 and the rotation of the motor 12 is such that the cam surfaces 19 spiral outwardly during rotation. The shaft 14, cam wheels 16 and motor 12 are rotatably mounted in the block 18 from which extends downwardly a sleeve Ztl. A driving rod provided with a shank 24 and a head 26 is contained in the sleeve 2li with the outer diameter of the head 26 making a sliding it with the inner diameter of the sleeve Ztl. An inwardly extending shoulder 23 provided with a washer 3l? at the upper end thereof limits the downward motion of the head 26 relative to trie sleeve 2d, at the point where the upper surface of the head 26 is substantially level with the upper surface of the block 13.

A striker 32 is adapted to be seated on the upper surface of the block i8 above the head 26 and two studs 34 attached to the striker- 32 project downwardly slidably into corresponding holes on the block 18 whereby the striker 32 may move up and down relative to the block 18 under the guidance of the studs 34. A shaft 36 extends through the striker and on each side thereof carries bearings 33 which are adapted to roll on the cam Wheel sur# faces 19 whereby the striker ft2 moves up and down relative to the block 13 in accord with the contour of such surface. A pair of tension springs d@ extend between the ends of shaft S6 and a cross arm 42 rigidly connected to the block 1S and thereby bias the striker 32 toward the block l and the bearings 38 toward the carn Wheel surfaces 19.

Below the downwardly extending sleeve '2li is provided a nail magazine Sil having a body 52. Upwardly ex-l tending from the magazine is an inner sleeve 54 having an outerdiameter such as to slidably telescope in the downwardly extending sleeve 2d and an innerdiameter to slidably receive the driving rod The magazine body below the driving rod is bored to provide a passage for the driving rod 24 therethrough. A pair of outwardly projecting studs 56 rigidly mounted in the upwardly extending sleeve 54E form the lower shoulder for a compression spring which surrounds sleeve 2d and bears upwardly on the lower face l? of the block l. A vertical slot 557" in sleeve 2d allows the studs Se to project through this sleeve and the sleeve 2G to move vertically relative to the studs. Slot 57 is closed at its lower end to prevent removal of studs 56 from sleeve 2d. Thus it will be seen that the telescoping body sleeve 2? and the magagine sleeve :Sd are biased to treir maximum extension by the compression spring 58, and the lblock l and driving rod are correspondingly biased away from the maga zine The nailing magazine body 52 is generally rectilinear and be constructed from a single block of metal having two sides @il and d2 converging adjacent the path ofdriving rod 2d, such sides dfi and. 62 being generally parallei to such path. 0n one of these sides 62 is providedV series or" parallel equally spaced exit opening 64. The ook 52 is slotted to provide guider/aya leading to` such openings 64, the guideways 66 being open to the upper surface of the block S2.

a bl

The openings d4 and the guideways 66 are of a widthl to slidahly receive the thickness of a nail shankfdl,

therein and are of a height to receive a substantial portion but not all of the length of such nail shank 63. It will be seen from the drawings that such guideways 66 are adapted to receive a number of such nails. The block 52 is provided with a hinged cover 70 and mounted on such casing is a linger 72 corresponding to each such guideway 66 and slidable parallel thereto; Each ringer 72 is biased toward the guideway exit opening 64 by a coil spring 74 and each linger 72 extends into a guideway 66 to bear upon the rearmost nail shank 68 therein and thus bias the nails therein toward the guideway opening 64. The cover 70 is preferably hinged to the block 52 for easy opening for the loading of nails in the guideways 66.

Each linger 72 is provided withra head 73 adapted to move in an individual guideway 75 in the cover 70. A key 77 is insertable in slots 79 on each side of the cover. Slots 79 are so located that the key 77 moving therein is adapted to move the lingers 72 collectively away from the conveyor 76. Thus the magazine is loaded by lifting the cover '70, thereby moving upwardly the guideway 75, lingers 72 and spring 74. The nails may then be inserted in each of the guideways 66 to a convenient depth. The key 77 is then inserted in the slot 79 and the fingers 72 cocked to the position remote from conveyor 76. While in this position the nger 72 and cover 70 are ro- V tated into closed position together, the ngers falling into place in guideway 66 behind the rows of nails therein. When the key 77 is withdrawn, the linger 72 under the impulsion of spring 74 bias the nails in each of the guideways toward conveyor 76.

It will be noted that the cover 70 is located sufficiently close to block 52 to prevent nails falling out of guideways 66 if the machine is used in an inverted position. A conveyor 76 and an independently movable actuator 78 are provided facing the openings 64 and both are provided with

surfaces

81 and 83 respectively adapted to slide on the block surface 62 about said openings, in a direction perpendicular to the longitudinal direction of the openings 64, the conveyor and actuating member being movable toward and away from the path of driving rod 24. The conveyor 76 and actuator 78 are two independently slidable members known collectively as the conveyor members divided along a line in said sliding direction, the members each being adapted to reciprocate in such sliding direction and such travel being between limits equal to the spacing of the opening 64. Such limits are known as the adjacent and the remote limit by virtue of their relationship to the driving rod path. Moreover, each of the

members

76 and 78 is provided with

grooves

80 and 82 respectively, of a depth to receive the thickness of a nail shank therein and the

grooves

80 and 82 are spaced as are the openings 64. Moreover, the

grooves

80 and 82 are so located relative to the limits that a groove 80 and a groove 82 aligns with an opening 64 at either of said limits whereby a nail may be ejected from an opening 64 under the impulsion of fingers 72 into a pair of aligned

empty grooves

80 and 82 at a limit;

.and also a nail ejected from'a groove 80 at a limit will be received into a guideway 64 against the biasing pressure of the nger 72.

It will be seen from Figure 7 that the conveyor 76 is adapted to ride in a wide rectangular groove 90 in the actuator 78 and that each member as its end adjacent the nailing location is provided with a pair of

cam studs

92 and 94 respectively adapted to cooperate with the driving rod actuating member. It will be seen that the grooves 80 in the conveyor are generally straight sided, that is, the sides generally project toward the guide way openings 64. The conveyor actuator 78 is provided with grooves 82 having one straight side but with the side adjacent the driving rod path chamfered to a considerable degree for a purpose to be hereafter noted. A pair of compression springs 96 and 98 connected to the block 52 at the end remote from the driving rod path are connected to studs on the conveyor 76 and actuator 78 and bias 4 such members strongly in the direction of the driving rod path. r

Slidably mounted on the block 52 is a bifurcated cam Vactuating striker (which is the driving rod actuating member) which projects through slots 102 in the block and has a pair of charnfered surfaces 104 adapted to contact the conveyor

members cam studs

92 and 94 and in passage to move each of said studs and its associated member a distance equal to the distance between openings 64. The actuating striker 100 is provided at its upper extremity with a horizontal surface 105 and with a bolt 106 projecting upwardly therefrom terminating in a head 108. The sleeve 20 of the block 18 is provided with a lateral projection 110 apertured at 112 to receive the bolt 106 the head thereof being larger than aperture 112. The projection 110 acts to depress the driving rod actuating member 100 by downward pressure on its upper surface 105 and to lift actuating member 100 by upward pressure on head 108.

Slots 109 in actuator 100 receive studs 111 on the magazine body. The effect of studs 111 is to bear on the sides of slots 109 during the exertion of cam pressure by the chamfered surfaces 104 whereby the actuator 100 is prevented from binding against adjacent parts of the magazine.

Pivotally mounted on the block 52 on pins 114 at right angles to the driving rod path is a nail support element 115 (shown in Figures 10 and 10a) including a concave surface 116 of the same radius as the driving rodpath. The concave surface 116 is releasably biased inward to slope inwardly into the driving rod path. A slot 117 with its axis in a vertical plane parallel to the driving rod path provides a passage for magnetic flux from a magnetic element 118 mounted on the nail support element on the side remote from the concave surface 116.

Spring 121 mounted in a corresponding aperture in body 52 biases the support element about pins 114 based in body 52 into the driving rod path while the support element is supplied with an aperture whose edge forms a shoulder 123 in the lower portion thereof whereby a shoulder 123 is formed to cooperate with an adjustable -stop 125 to control the inward slope of the concave surface 116 and varyits slope for various sizes of nails.

The adjustable stop is mounted on the end of bolt 127 to rotate therewith and control the slope of surface 116. The bolt 127 is threaded and mounted in a correspondingly threaded bore 119 in the body 52 as shown in Figures 2 and 3.

The inward slope of the surface compensates for the differences in diameter of head and point so that the nail is retained in a position aligned with the driving rod path. Thus as the driving rod 24 travels downward following the nail into the material the concave surface 116 pivots back out of the way to allow free travel of driving rod 24.

As previously mentioned the parts of the nail supply assembly should be of non-magnetic mateiral to avoid interfering with the operation of the magnetic element 118.

The device is shown in the rest position in Figure 8.

In operation the lower surface of the block 52 is held against the area of the .material wherein the nail is to be inserted. The motor is turned on and the operator presses on the handle 11 moving block 18 and sleeve 20 toward the nailing location. Such pressure has the eifect of moving the mounting for the cam wheel toward the nailing location while the striker 32, pulled downward by tension springs 40, follows the movement ofthe block 18 while driving rod 24 either follows downward by gravity or by the pressure of striker 32 on head 26, the position.

However, when the lower extremity of the driving rod 24 contacts the nail head and the nail point contacts the surface of the material, such -downward movement on the striker 32 and if downward pressure on the block assente 18 continues, the head 26 projects above the upper surface of the block 18 to correspondingly raise striker 32 above the surface of the block, against the bias of springs 40. Similarly the bearings 38 will be separated from the cam wheel surfaces 19 during a portion of the cam Wheel rotation, the length of the portion depending on the upward projection of head 26 above block 18 and therefore on the pressure exerted.

As the cam wheels 16 rotate, it will be seen that since during the portion of their rotation the wheel surfaces 19 contact the bearings 38, the bearings and therefore the striker are alternately lifted and dropped to supply nailing force to head 26 which is transmitted through driving rod 24 to the nail.

it has been noted that the arc of contact of cam wheel surfaces `19 and bearings 38 decreases as the pressure on block 18 increased. If the pressure is increased suiiiciently to cause a greater separation than that taken up by the variation of radius of cam Wheel 16, then there will be no contact of cam wheel surfaces 19 and bearings 38 and therefore no striker action, the striker 32 remaining suspended on the bolt and head 26 (see Figures 12 and 13).

Thus no striker action will take place until the pressure is suiciently decreased. This feature of the invention ensures that the driving strokes on the nail will be relatively light so that the initial strokes will not disalign the nail.

As shown in Figure 1l, with proper weight on the handle 11 the repeating strokes of the striker 32 will gradually drive the nail into the material and the block 18 will move gradually downward with the striker 32 following subject to the cyclic oscillation due to the effect of cam wheels 16. Thus the block 18 and its rigidly attached sleeve 20 move toward the magazine block 52 against the bias of compression spring 58.

After a short initial downward movement of sleeve 20 the projection 110 on the sleeve 20 will contact shoulder S on the bifurcated actuating member 100 to move it also downwardly.

It should be noted at this point that due to the urging of

springs

96 and 98, co-nveyor 76 and conveyor actuator 78 are moved to their limiting positions adjacent the driving rod path, that is to the position shown in Figure 3.

The beginning of the cycle of operations is described with the

sleeves

20 and 54 extended and a nail in the driving rod path ready to be driven so that the

grooves

80A and 82A are empty and the conveyor is in the position shown in Figure 3.

The sequence of conveyor operations during the driving of a single nail will now be described:

As the driving rod 24 continues to move the nail into the material, the bifurcated actuator 100 is urged further downwardly and contacts and moves the conveyor actuator 78 away from the driving rod path a distance of roughly half the spacing between the nail grooves 80. The arrangement of the conveyor 76 and the nails is then as illustrated in Figure 4 and the nails have been pushed by the chamfered surfaces of conveyor actuator 78 back into guideways 66 and clear of conveyor 76.

At this point in the travel of actuator 78, the cams 104 on the bifurcatel member 100 contact cams 94 as well as 92 to move actuator 78 and conveyor 76 together away from the driving rod path until actuator 78 reaches its limiting position remote from the driving rod path. Conveyor 76 is free to move in this way since all nails were pushed out of the conveyor grooves 80 by the actuator 78. The position at the end of this step is shown in Figure 5.

When the actuator 78 has reached its limiting position the chamfered surfaces 104 have passed the cam studs 94 so that the vertical sides 107 of the bifurcated actuator slides along studs 94 retaining actuator 78 at its remote limit position but causing no movement of the actuator past the remote limit position. The bifurcated actuating member 100, however, continues to move downward and the .chamfered surfaces 104 continue to move conveyor 76, by means of studs 92, untilthe conveyor '76 reaches its remote limit position. The arrangement of the conveyor members is then as shown in Figure 6 which is the position of the various members when the shank 24 has fully driven a nail into the material. It will also be noted Vthat due to the spaces, of the limit positions, the grooves and 82 of the conveyor niembers are again aligned beneath openings 64 so that the adjacent nails in guideways 66 are urged by fingers 72 into the aligned grooves. It should also be noted that each nail is now located in an aligned groove which is the next groove in the driving rod path direction along the conveyor to that groove in which such nail was received in Figure 3.

Meanwhile as the driving rod 24 travels downward following the nail into the material, the concave surface 116'pivots back out of the way to allow free travel of driving rod 24.

The nail having been driven, the operator releases pressure on casing 10 and sleeve 20 and compression spring 58 bearing on stud 56 moves the sleeve and casing upward relative to block 52 and inner sleeve 54. Projection 110 on sleeve 20 rides up the bolt shank 106 without moving it, until the projection 110 contacts bolt head 108 to move the bifurcated actuating member 100 upwardly. The restraining force of vertical side 107 of member is -rst removed from cam studs 92, while still restraining cam studs 94. The conveyor 76 does not then start to move since it is locked to actuator 73 by the nails in the aligned grooves. However, when the vertical surface 107 passes above cam studs 94 the actuator 7S is released and with conveyor 76 is snapped back to its position adjacent the driving rod path. Moreover, the nail, contained in the driving rod adjacent aligned

grooves

80A and 82A, is moved to just beside the driving rod path and within the range of the magnetic element 118, so that the nail is drawn -onto the concave surface 116 to be held for the striking action at the next location. The position of the conveyor members is then as shown in Figure 3. The Iwhole assembly is then moved to a new location and the striking of a new nail initiated.

The embodiments of the invention in which an eX- clusive property or privilege is claimed are defined as follows:

l. In an automatic nailing machine a reciprocally movable hammer defining a hammer path, means for supporting a nail at its head and adjacent its tip, said means including a surface releasably biased at its lower end into said hammer path to so support said nail, and a magnet mounted with said surface adapted to draw nails from a nail supply location onto said surface.

2. In a nailing machine, a block, a shank adapted to longitudinally transmit driving force to a nail head and to travel in the same direction as such nail is driven into the wood, the travel of such shank defining a path, means for supporting a nail at its head and adjacent its tip, said means including a member having a concave surface, having its lower end resiliently biased into said nailing stroke path to so support said nail, and a magnet adapted to attract nails on to said concave surface and means for supplying nails to the eld of said magnet.

3. A nail driving assembly including: a block, a striker mounted thereon movable with respect to said block, said striker being biased in one direction relative to said block, a pair of cam wheels each having at least one crest and an equal number of troughs rotatably mounted on a common shaft and being so arranged relative to said striker that a part of said striker rides on one cam wheel and a part of said striker rides on the other cam wheel, said striker parts being spaced from one another whereby said striker parts ride on said cams to be moved against said bias by a crest and released to move with said bias by a trough, means for rotating said cam wheel shaft, means located to contact said striker between said References Cited in the le of this patent UNITED STATES PATENTS McKay Mar. 27, 1877 Herr Mar. 3, 1891 8 3 Hoofnagle Oct. 23, Shallenberger June 24, Metcalf V Feb. 16`, Day Sept. 13, Govanus July 30, Peterson July 3, Anstett July 15, Anstett Nov. 4, Francis June 21,