US1461712A - Nail-pulling machine - Google Patents

Description

July 10, 1923.

W. ELLIS NAIL PULLING MACHINE Filed May 2o. 1922 4- svheets-sneet 1 INVENTORS lvm M E TTRNEK HAMM 4 Sheets-Sheet 2 mwa w. ELLIS NAIL EULLING MACHINE Filed Ma July no, w23.

Juny 1o, 1923.

W. ELLIS NAIL PULLING MACHIN Filed May 20, 1922 4 Sheets-Sheet 3 INVENTOR- Twin/Er Ju1y1o,1923. 1,461,712

W. ELLIS NAIL PULLING MACHINE- Filed may 2o. 1922 4 sheets-sheet 4 www 0F BELOIT, WISCONSIN, .ASSIGNOR 0F ONE- 1 "0F BEL-UIT, WISCONSIN.

Narr-Pomme E.

v Application led May 20, 1922. Serial No. 562,305.

To all whom t may concern:

Be it known that I, WALLACE ELLIS, a citizen of the United States, residing at Beloit, in the county of Rock and State of `Wisconsin, have invented certain new and useful Improvements in Nail-Pulling Machines, of which the following is a specification.

My invention relates to devices for eX- tracting nails from boards or planks and the object is to provide a device of said kind adaptable mainly for extracting nails from planks which have been used in concrete form work and must necessarily be cleared of nails before being used again for the same or other purposes.

In the accompanying drawings;

Fig. 1 is a top view of the complete machine.

Fig. 2 is a side elevation of Fig. 1.

Fig. 3 is a front elevation of the machine looking as from the right toward the left in Fig. 2.

Fig. 4 is a detail tace view of the nail driver of my machine and Fig. 5 is anedge view of Fig. 4.

Fig. 6 is an elevation of the so-called rake used in my machine.

Fig. 7 is an enlarged detail elevation on line 7-7 in 1.

Fig. 8 is an enlarged fractional face view of the yielding portion of cam 79 in Fig. 2.

Fig. 9 is an enlarged sectional view on line 9 9 in FiOj. 1. v

Fig. 10 is a d`tail elevation of one of the main separator plates used in conjunction with the nail-straightening and removing mechanism of my machine.

Referring to the drawings by reference numerals. my device preferably consists of an elongated upper main frame of two parallel channels 11, mounted securely on fouroffset supports 12. and a secondary frame 13 suspended below the first mentioned channels and comprising also parallel channels 13"*y spaced similar to the former. Vertical sliding bars 14 secured as at 14a to the web of each lower frame channel, extend upwardly through slots 15 in the main frame and the upper end of cach engages a transverse-shaft 16 keyed in a wide faced disk wheel 17 normally resting on the top flange of the main frame channel 11.

Each disk 17 functions as a cam, having a lever arm 18 secured to it and a connecting 55 rod 19 is pivotally connected with the two cams on each side .(see Figs. 1 and 2) one of the two forward cam arms 18 (to the right in Figs. 1 and 2) being connected at 20 to the rear end of a pitman 22 the forward end 60 of which is pivotally secured to a hand lever 23 normally engaging a toothed segment 24. Manipulation of said lever will raise or lower the secondary. frame, disks 17 rolling on the flanges of the main frame, raising or H lowering the shafts 16 and thereby the secondary frame. the object being to set the two frames a certain distance apart according to the thickness of planks to be cleared of nails by the mechanism mounted in said frames and which will now be described.

The right hand end of Figs. 1 and 2 is the front of the machine illustrated also in Fig. 3. into which boards or planks 25 are fed between two transversely arranged corsprocket chain 32 engages the two sprockets, 85

one of its runs being kept taut by a chain stretcher 33. Adjacent sprocket 29a l provide on shaft 31 a pulley 34 engaged by a belt 35 extending from a pulley 35a on the shaft 36 of an engine 37, shown secured to 9o a platform 38 in the lower portion of the machine. imparting motion to the corrugated lower roller 26a in the direction indicated by arrow 39 (Fig. 2) and thereby feedinof the left in Figs. 1 and 2.

and end so planks 25 inwardly toward the o5 I In the preferred form of my machine, as illustrated, one wide plank or two narrow ones 25 may be fed through at one time and the first operation is to remove the nails having their heads down, by mechanism mounted mainly in the rigid frame. The second operation is to remove nails having their heads-in the upper side of the planks, by another mechanical unit similar to the first, mounted mainly in the secondary frame and necessarily in inverted position relative to the first mechanism. I will therefore describe only the mechanism of the first nail removing unit and only such parts of the second unit as are not common to both.

The rollers 26, 26a, which I will call the feed rollers have deep and narrow corrugations, as shown, permitting planks to be inserted between them, the protruding nails being guided into the grooved portlon of the corrugations and the planks immediately are moved rearwardly to start the first operation (removing nails with theirheads down). Immediately back of roller 26, in the main frame, I mount a transversely reciprocable, verticallydisposed blade 4() 'of heavy plate steel (see Fig. 6) havlng at lts upper edge oppositely extended flattened bars 40 adapted to slide in bearings 41, secured on the top flanges of the main frame 11, and its lower edge comprising a row of downwardly and alternatively forward and rearwardly projecting pointed teeth 42. The entire blade is reciprocated transversely by a horizontally arranged bell crank 43 receiving motion through a connecting rod 44, having ball joints 44x '(see Fig. 1), the rear end of which is rotated by a crank 45 at the-outer end of a shaft 46 extending through the main frame and its other end having a bevel gear 47. A shaft 48 mounted in bearings 49 on the side of the channel 11, has one bevel pinion 50 .meshing with gear 30 on shaft 27 by which said pinion 50 and shaft 48 are rotated in direction of arrow 51, and another bevel pinion 52 meshing with bevel gear 47 rotates shaft 46 in direction of arrow 53 (Fig. 2) 54 is a spirally corrugated. drum keyedon shaft 46, the spiral ridges thereof comprising a con-tinuous row 'of tapered pegs resembling each a frustrum of a yramid.

The teeth 42 of blade 40 are -normally just even with the surface of plank ,25 beingy fed into the machine and the crosswise reciprocating movement causes said teeth to engage the pointed ends of nails 55 bent to the surface of the plank and turns said ends rearwardly or to approximately 30V degree angle with relation to the-.long edge of the plank as the latter movestoward the spiral-l y corrugated roller 54. The spirally arrnged semi-pyramidal pegs lof the said r ller engage the angularly arranged nail ends as the plank travels rearwardly and turns all of said nail ends toward therear of vthe machine and in the direction the plank 25 travels.

The next operation is to straighten the rearwardly pointing nail ends .toa vertical position and to right angles with the surface of the plank, then driving the nails downward just before they are extracted from the plank, by the following mechanism which, for convenience, I call the raper. v

Said rapper is mounted on a number of transversely arranged bolts 56 and 56a between-two upright frameA plates 57 secured on the inner sides of the main frame channels 11. The bolts 56, 56a maybe extended through the channels and be provided with nuts at the outer sides of the channel webs. On said bolts are placed a series of alternate thick and thin plates the entire distance between the upright frame plates. 57. The thin plates 58 are spacers, preferably oneeighth inch thick and of the shape shown in F igs, 7 and 10, and the thick plates 59, 59, are preferably three-eighths inch thick for best results, 59 being elongated vertically and having reduced upper portions 59a".

lSaid upright members are engaged by the bolts 56a inthe forward part of the rapper and the rear spacer plates .59, also threeeighths inch thick', having each the forwardly and downwardly sloping surfaces 59,are secured between the thin plates 58 on the bolts 56. Guided vertically between the plates 58 and on the sloping surface or edge 59c of each plate 59 is a driving plunger or late 6() with a vertical front face 60 (see ig 7). These plungers are threeeighths inch thick and in alignment longitudinally of the machine with the vertical members 59-59a of the rapper, the latter members having each a rearwardly exposed vertical face 59B. The upper an ula face of 'plunger 60 is guided by a gui e member 61 with ears 61a at its ends having perforations for bolts 61b to hold the guide in the upright frame plates 57. A series of ver'- tical plungers 62 with spacers 63 at their upper ends, and all perforated for connecting bolts 64 and the plungers only extended upwardly and perforated for a larger bolt 65 operatlvely connected-with means, to be described,l for simultaneously operating all of the vertical plungers 62. These plungers 62- are the same thickness as the rear plunge ers 60, the lower ends of the; former bei-ng reduced as at 66 in Fig. 7 andy their extreme lower ends cut square and slightly counter- ,bored upwardly as at 62a. YThe angular plungers 60 are reciprocated, by other means to be described, coming down on their forwardl stroke-so that their front ends 60 stop close to the vertical face 59wof the upright members 59a -at a time when the vertical. plungers 62 are at their upper position amavis shown dotted in Fig. 7, In said Fig. 7, as-

suming plank 25 is moa' rearwardly the point of a nail 55 is guid between two of the separator plates 58 then brought against the sloping face 59c of the separator plate 59 which starts to bend the end of the nail upward and as the lank radually moves on the plungers 60, y its ammering forward strokes straightens the nail with its vertical face 60a until the nail end reaches a height where the alternating vertical plunger strikes said end downwardly with its lower end 62. The latter action forces the nail downward so that its head will be below the lower surface of the board (see 55b in Fig. 7) at which time another device mounted in the lower frame of my device instantly removes the nail.

The vertical plungers of the above device are operated by a croed belt 67 engaging a pulley 68 on engine shaft 36 and extended upwardly to a pulley 69 keyed on a transversely arranged shaft 70 in bearings 71 inthe upper frame plates 57. Keyedon said shaft, between the plates 57, is a spur ar 72, meshing with another spur gear 73 Eyed on a transverse shaft 74 rotating in bearings 75 inthe plates 57. The latter shaft carries two spaced cams 76 adapted to contact with the upper ends of correspondingly spaced vertically guided sliding bars 77 the lower ends of which are engaged by the shaft 65 of the vertical plunger series. The cams (76) push the plungers 62 down once for each vrevolution of shaft 74, and the whole plunger member is immediately pulled up, after the cam action, by means of coil springs 78 engaging the same shafts 65 and 74 with their opposite ends. (See Fi 3, 4, and 5.)

''lie angularly arranged plungers 60 are reciprocated vby another set of two cams 79 mounted on a transverse shaft 80 outside of the plates 57, and between the plates is a spur gear 72*l secured to the shaft and meshing with the gear 72 on shaft 70 previously described. Said cams 79 each have one side concentric with the shaft and the other side flattened (see Fig. 2) the meeting point of the two surfaces. at one side only, having a resilient radiallyy slidable bumper 81 with a rounded outer end and is normally spring pressed outwardly by coil springs 81X. A sliding bar 82 sliding in guides 82a and arranged linearly with and extending back from the straightener plates 60, is connected to the latter by engaging a transversely arranged shaft 83 projecting through slots 83x in the plates 57.*and its rear end provided with roller 84 normally engaging the cam, the latter rotating in directioiuof arrow in plungersnslidmg bar, etc. are normally held `pressed toward the cam TS) by coil springs 86 attached to shaft 83 and to shaft 8O with their opposite ends. In Fig. 2 the plungers are down the shde 82 also down because it is lheld thus by the outer curve of the cam 79 but when the cam rolls around the slides 82 and consequently the plunger 80 are brought upward by the springs 86 against the flattened surface of the cam until the high point of bumper 81 comes in contact with slide 82. As the latter point is reached the slide is furthest forward permittin the straightener' plates 60 to drop forwar to the furtht point with their faces 60. If however an extra large nail comes between said face and face 59'le of the upright member 59a in the straightener, the radially yielding part 81 of the cam prevents any breakage of parts. Said yielding element 81 is merely a radially slidable bar in the cam, with coil springs 81* back of it which yield radially when undue pressure is exerted on its outer curved face 81 (see Figs. 2 and 8).

84" are corrugated supporting rollers spaced as desired and mounted transversely in the secondary frame 13 to support the under side of planks being fed into the machine and 84"' are similar rollers mounted in the main frame 11 for engaging and guiding the upper side of the plank 25 being passed through the machine.

I have described .above how nails to be extracted from the lower sides of planks are started 'downwardly so that their heads are away from the lower side of the plank as 55 in Fig. 7. At this instant the nail or nails are immediately extracted by a claw member, as follows;

In the lower or secondary frame I key on a transverse rock shaft 87 extending through the channel members of said frame and having bearing 88. Said shaft 87 has keyed to it a number of eccentric disks 89 engaged by corresponding disk rings 90a of a forwardly and upwardly inclined toothed member 90 extending across the frame between its channels, Said shaft also has a spur gear 94* meshing with pinion 91 and is driven by the latter. This member 90 has two rearwardly inclined arms 9()b the rearends of which are pivotally connected each with a pin 91a of a spur gear 92 `rotating on a stub shaft93 secured in the frame channel 13 and meshing with a driving Vgear 9-1 secured on one end of a transverse shaft 94 with a sprocket 94" rotated by a chain belt 95 driven' by a sprocket 96 on a shaft Tlfvin lower rearpor-Y tion of the Secondary trame 13. A spur gear 73 on the same shaft 74f'is driven b another spur gear 72" on 'a' Vtransverse sha' t 7()r in lower part of thesafne frame (see Fig.v2), the latter shaft 70Ky having secured at its outer end apulleyfl() e'ngagedbyf a. belt 101 driven by a pulleylGQf on the engine,l shaft 36. y p v 'i The rotation of rock shaft 87 and its eccentrics causes theclaw member. which consists llO the upperffsurface of the plank the same mechanism is duplicated in inverted position to the rear of those already described,

`the planks merely proceeding rearwardly andemerging from the rear end of the machine clearedof nails. I have designated all parts of the latter nail removing device having counterparts in the first nail removing means with like numerals and the exponent r in each case. v

A shaft 105, rotating in bearings 106 on the side of the secondary frame channel 13 has a bevel pinion 107 engaging a bevel gear 108 on the shaft 31 of the initial feed roller 26. ,Said shaft has an intermediate bevel pinion 107a and a similar' pinion 107b at its rear end for driving the bevel gears 108 which in turn rotates the rear feed rollers 26 and 26d by means (not shown) similar to those which rotate the'initial feed rollers 4 The construction and operation of my invention have now been disclosed but Variations or modifications in various4 parts thereof will probably be necessary to the perfection o f it, without however departing from the spirit and scope of the invention.

lVhat I claim is: l

1. In a device of the class described, a rigid elongated frame and a secondary vertically adjustable frame below the rigid frame, means within said frames for moving a number of planks longitudinally between them and means for removing protruding nails from the planks during the movement of thesame. y

2. The structure specifiedl in claim 1,'and means for holding the secondary frame in spacedparallel relationto the rigid frame according to the thickness of planks .from which nails are to be removed.

3. The structure specified in claim 1, said plank moving'means comprising pairs of corrugated, transversely arranged feed rollersmounted in spaced relation vertically,

for each' pair'one in each frame, and all ro-V tated with uni-form speed and in a direction to move the l.planks rearwardly.

4. The structure specified in claim 1 in which the nailremoving means successively remove the nails from one side of the-planks and then from the other side thereof.

5. The structure specified in claim 4, the nail removing means for each side of the planks' comprising successively transversely* reciprocable means for turning the pointed nail ends forwardly and rearwardly in approximately longitudinal direction of thev travel of the plank, means comprising a transversely arranged spil-ally corrugated roller for turningr said nail yends all in one general direction rearwardly, mea-ns rearward of the drum for straightening said nail ends to vertical position, means impelling said ve 'tically straightened nail ends towards tie surface of the plank and simultaneousl bringing the heads of the nails away fro the opposite surface of the plank and means engaging said headed end of each nailjfor extracting them from the plank. 6. The structure specified in claim 5, said transversely arranged nail straightening means comprising a vertically disposed blade` with alternately forwardly and rearwardly pointed teeth in its lower edge and adjacent the surface of the plank to enga e pointed nail ends to turn them in a generallfy forward or rearward directionwhile the plank is passing said reciprocating toothed blade.-

7. The structure specified in claim 5, said drum arranged rearwardly of the reciprocating blade and having spirally arranged ridges comprising rows of closely set projections each resembling a frustunr of a pyramid and said spiral ridges adapted to engage the nail ends and turn them all in a rearwardly directed position with their points.

8. The structure specified in claim 5, said Y nail straightening means rearward of` the drum comprising a series of stationary spaced plates each with a sloping face terminating adjacentthe surfacev ofA the plank and engaged by one of the pointed nail ends and tending to raise said nail end while the plank is moving rearwardly a reciprocating guided plunger sliding on said sloping surface its forward face verticaland adapted to contact with the nail to straighter the nail vertically.`

9. The structure specified in claim 8, and a series of vertically disposed spaced plungers reciprocating vertically and adapted to contact with the ends of the vertically i straightened nails tovdrive the latter partly melma m ly connected with a rotating wheel to give the vertically disposed spacers between the blade a rocking motion and said eccentrics plates having the sloping surfaces, for guidgiving the blade a lunging motion with its ing the angular and vertically reciprocating l@ claw edge toward the surface of the plank plungers. v

5 thence a'vay from said surface -to extract all In testimony whereof I ailix my signature.

nails with their heads projecting therefrom.

11. The structure specified in claim 9, and WALLACE ELLIS.

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