US2632939A - Sawing machine - Google Patents

Description

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M IFLII March 31, 1953 E; R. EVANS ET AL SAWING MACHINE Filed Aug 12 1950 5 Sheets-Sheet 2 I nuant. [TD'E EDWIN HEZVANE W EVANS HL'LEI 1* rue.

M mf mi m March 31, 1953 Flled Aug 12, 1950 MW 2% 3 Hm W /r w n U 2 a RW/ QM A 5 m1 w /M DH m E. 'R. EVANS ET AL SAWING MACHINE March 31, 1953 Filed Aug 12, 1950 Patented Mar. 31, 1953 SAWIN G MACHINE Edwin Robert Evans and John Henry Walter Evans, Hamilton, Ontario, Canada Application August 12, 1950, Serial No. 179,032

3 Claims.

. l Our invention relates to a machine for cleaning reclaimed-concrete form boards or panels, and

the object of the invention is to provide a machine wherein used concrete form boards or panels may be reconditioned for further use in the construction of concrete formsQ General practice in the construction industry has been to scrap concrete form boards after they have been removed from the set concrete, and to use new lumber in the construction of forms. This practice was not considered to bepa-rticularIy wasteful when lumber was abundant and cheap, but due to todays scarcity of lumber and high prices, it is realized that the scrapping of used 'form board-s adds considerably to concrete con struction costs and also veryfrequently delays construction due to the difficulty in obtaining new lumber. v

A particular object of the present invention is todevi-se a simple and effective machine through which used concrete form' boards may be passed for reclaiming, and wherein protruding nails in the boards may be readily severed and the boards thoroughly cleaned of adhering concrete whereby they are put into condition for re-use. Another object of the invention is to provide board flattening or squeezing rollers in the machine so that the nails may be out off close to the board surface and the faces of the boards thoroughly scrubbed and cleaned. irrespective of any warps developed inthe boards due to exposure of their inner faces to wet concrete.

circular saw being supported in the frame and.

positioned to engage nail ends hanging from the board and cut them off.

With the foregoing and other objects in view as shall hereinafter appear, our invention consists of a concrete form board or panel cleaning machine, all as hereinafter more particularly described and illustrated in the accompanying drawings inwhich:

Fig. l is a plan view of the machine.

Fig. 2 is a vertical longitudinal cross-sectional view through the machine, being taken through the line 2- 2, Fig. l.

Fig. 3 is an enlarged transverse cross-sectional view through the machine, being taken through the line 3-3, Fig. 1. I

Fig. 4 is an enlarged transverse cross-sectional view through the machine, being taken through the line 4-4, Fig. l, and

nected by an endless chain l0.

Fig. 5 is an enlarged side elevatlonal view of a fragmentary portion of the machine, being taken from the line 5-45, Fig. 1.

Like characters of reference indicate corresponding parts in the different views of the drawmgs.

The machine broadly comprises a plurality of pairs of upper and lower rollers, a nail cutting saw and a pair of scrubbing rollers, all of which are supported in horizontal alignment uponna frame 2 of such a height that the boards may be conveniently passed through the machine by the operator.

The board feed end of the frame .2 carries a pair of spacedeapart parallel channel guide members 3 between which a board may be fed into the machine, as illustrated in Fig. 4. In order to permit the distance between the channels 3 to be adjusted to various board width-s, a pair of threaded spindles =4 are mounted within bearings '5 in the vicinity of the upper edges of the frame 2. Each of the spindles 4 is formed with two threaded portions 6 and 1 at either end thereof, the threads 6 being right-hand threads and the threads I being left-hand threads. The guide channels 3 are carried upon two pairs of screw blocks '8 which are mounted upon the threaded portions 6 and l of the spindles 5, whereby rotation of the spindles 3 in one direction will move the blocks 8 and channels 3 towards each other and rotation of the spindles l in the opposite direction will move the blocks 8 and channels 3 apart. 7

In order that the screw blocks '8 may move in unison upon rotation of the spindles 4, two sprocket wheels 9 of equal diameter are-mounted upon the ends of the spindles =4 and are con- One of the spindles A carries an operating handle H upon its end opposite to the end carrying the sprocket wheel 9. It will be understood that upon rotation of the handle 'I l the operator may either move the guide channels-3 towards each other or apart to suit the width of the boards being passed between the channels.

To carry a board into the machine, a pair of feed rollers l2 and [3 are suitably mounted and positioned upon the frame 2 at the inner end of the channel guide assembly. The roller l3, as illustrated in Fig. 3, consists of a shaft 1M oarrying a plurality ofequal diameter roller flanges it which are adjustably secured in any suitable manner upon the shaft M as by locking screws L6. The outer flanges P5 are formed with lips I! which act as guides in directing a board I-B between the rollers. The roller shaft M carries 1a sprocket wheel [9 on one end thereof and over which a drive chain 2% passes.

As used form boards generally carry a number of nails which remain in the board after it is pulled out of placed in taking down a concrete form, the purpose of providing a board guide consisting of two channels and lower rollers of flange form will be readily apparent upon reference to Figs. 3 and i. The channels 3 are so proportioned that they only overlie the edges of the board 8 to a slight degree so as to clear the nails 2! which are usually spaced in from the edges of a board, and the flanges i5 are so arranged upon the shaft L l-that the nails will pass between the flanges as the board passes through the feed rollers.

A second pair of rollers 22 and 23 are adjacently positioned to the feed rollers i2v and i3 and are of the same construction and arrangement, except that the roller 23 is not driven. The rollers 22 and 23 are provided for the purpose of flattening a warped board, such as illustrated in Figs. and i, and for this purpose are spaced apart a distance substantially equal to the thickness of a board.

A circular saw 24 is positioned adjacently to the, pair of rollers 22 and 23 and is arranged to lie in close proximity to the bottom face of a board passing thereover. The saw is carried upon the upper end of a shaft 25 mounted within a pair of bearing blocks 26 and driven by a motor 27 through the medium of a drive belt 23 extending around a pair of sprockets 2e and at on the motor shaft and saw shaft 25. The circular saw is designed to rotate at a high speed and out off any nails 21 protruding downwardly from a board passing thereover.

Another pair of board squeezing or flattening rollers 3i and 32 are carried upon the frame to receive the board after it passes over the nail cutting saw 24 for the purpose of retaining a warped board in its flattened form as it passes over the saw to be directed between the scrubbing brushes.

The board cleaning assembly is adiacently positioned to the rollers 3! and 32 and consists of a pair of rotary scrubbing brushes 33 and 3 which are carried upon spindles 35 and 36. The spindle 35 is mounted within a pair of bearing blocks 37! carried within bearing block frames 33 extending upwardly from the frame 2. The spindle 36 of the brush 3a is carried within a pair of bearing blocks 39 secured to the under sides of the top members of the frame 2. 'The spindles 35 and 3B carry gear wheels t!) and-4i which mesh with a suitably mounted gear wheel '52 positioned therebetween. The spindle 35 also carries a sprocket wheel 43 over which a drive chain 4-": passes. It will be apparent that rotation of the scrubbing brush 34 and its spindle 36 will, through the medium of the-gears t0, 4! and 42, rotate the scrubbing brush 33.

To feed a finished board from out of the machine, a pair of rollers 45 and ii: are mounted upon the frame 2 adjacent to the scrubbing brushes, the spindle fi'i of the lower roller carryed for vertical adjustment. The spindles of the upper rollers are carried within bearing blocks 52 which are slidably mounted within inverted U-shaped frames 53 carried upon the upper edges of the frame 2. The blocks 52 are urged upwardly within the frames by compression springs 54 inserted between the lower faces of the blocks 52 and the top edges of the frame 2. Adjusting screws 55 are threaded into the top cross members of the frames 53 to bear against the upper faces of the bearing blocks 52.

In moving the rollers closer together the adjusting screws 55 are threaded downwardly whereby the bearing blocks 52 are moved clownwardly against the compression of the springs 54. To move the blocks apart the adjusting screws 55 are. threaded upwardly to allow the compressed springs 54 to push the bearing blocks upwardly.

The machine driving rollers and saw may be driven in any suitable manner, as, for example, that shown in the, drawings, wherein we furnish two motors, one motor for drivin the rollers and a second motor 2?, as hereinbefore described, for driving the saw. v

The roller drive comprises a motor 56 coupled to a speed reduction and drive reversing gear box 5?. The gear box is designed to incorporate a pair of drive shafts which rotate in opposite directions. Referring to Fig. 5, one drive shaft 58 is contained within a second hollow drive shaft or sleeve 59, which rotates in the opposite direction to the shaft 58. The drive chain id extending from the sprocket it of the scrubbing brushes extends over a sprocket wheel 69 secured to the drive shaft 59,.

The drive shaft 58 protrudes outwardly from the hollow end of the drive shaft 59 and upon which a pair of sprocket wheels are mounted. Qne sprocket wheel carries the chain 2b which extends to the sprocket i9 of the lower feed roller i3, and the other sprocket wheel carries the chain t9 extending to the sprocket wheel 48 of the roller 46. It will thus be appreciated that through this arrangement the scrubbing brushes 33 and 3d rotate in the opposite direction to the driving rollers whereby the brushes rotate against the movement of the board passing therebetween.

In adjusting the machine, the guide channels 3 are arranged such a distance apart that a board may freely slide therehetween. The roller [2 of the feed rollers 52 and i3 is adjusted inheight so that a board may be readily fed between the rollers by the operator. The board flattening rollers 22 and 3! of the pairs of rollers .22 and 23 and 31 and 3,2 are so adjusted in height that the distance between the faces of the rollers of each pair is substantially equal to the thickness of the board to be received, so that a warped board, such as illustrated in Figs. 3 and i, in passing between these pairs of rollers is flattened whereby the circular saw may be ad- .iusted to sweep across the lower face of the board passing thereover, and the scrubbing brushes to engage the board passing therethrough across its entire width.

It will thus be apparent that we have devised a, very simple type of machine which may be readily set up at the site of a building construcciated that it may be readily proportioned to treat and reclaim form panels in the same manner as the boards, and while we have shown and described a particular embodiment of our invention, it is to be understood that we may make such changes and alterations as we may from time to time deem necessary, without departing from the spirit of our invention as set forth in the appended claims.

What We claim as our invention is:

1. A machine for reclaimed nail containing concrete form boards and comprising a frame supporting a plurality of pairs of upper and lower rollers between which a board may be passed for reclaiming and a source of power for rotating several of the rollers, one pair of rollers constituting the means for feeding a board therebetween into th machine and having one of its rollers driven from the source of power, one of the said board feeding rollers being formed with a plurality of board face engaging flanges, a sec ond pair of rollers constituting the means for flattening a board and adjacently positioned to the board delivery side of the feed rollers and having their rolling faces spaced apart a distance substantially equal to the thickness of the board to be received therebetween whereby the faces of said rollers engage the entire widths of the upper and lower faces of the board, and a circular nail severing saw driven from the source of power and positioned adjacently to the board flattening rollers at the board delivery side thereof, the circular saw being positioned to lie in close proximity to the bottom face of a board passing thereover.

'2. A machine for reclaimed nail containing concrete form boards and comprising a frame supporting a plurality of pairs of upper and lower rollers between which a board may be passed for reclaiming and a source of power for rotating several of the rollers, one pair of rollers constituting the means for feeding a board therebetween into the machine and having one of its rollers driven from the source of power, one of the said board feeding rollers being formed with a plurality of board face engaging flanges, a second pair of rollers constituting the means for flattening a board and adjacently positioned to the board delivery side of the feed rollers and having their rolling faces spaced apart a distance substantially equal-to the thickness of the board to be received therebetween whereby the faces of said rollers engage the entire widths of the upper and lower faces of the board, a circular nail severing saw driven from the source of power and positioned adjacent to the board flattening rollers at the board delivery side thereof, the. circular saw being positioned to lie in close proximity to the bottom face of a board passing thereover, a second pair of board flattening rollers positioned to receive a. board in its travel upon passing out of contact with the nail severing saw.

3. A machine for reclaimed nail containing concrete form boards and comprising a frame supporting a plurality of pairs of upper and lower rollers between which a board may be passed for reclaiming and a source of power for rotating several of the rollers, one pair of rollers constituting the means for feeding a board therebetween into the machine and having one of its rollers driven from the source of power, one of the said board feeding rollers being formed with a plurality of board face engaging flanges, a second pair of rollers constituting the means for flattening a board and adjacently positioned to the board delivery side of the feed rollers and having their rolling faces spaced apart a distance substantially equal to the thickness of the board to be received therebetween whereby the faces of said rollers engage the entire widths of the upper and lower faces of the board, a circular nail severing saw driven from the source of power and positioned adjacently to the board flattening rollers at the board delivery side thereof, the circular saw being positioned to lie in close proximity to the bottom face of a board passing thereover, a third pair of board flattening rollers positioned to receive a board in its travel upon passing out of contact with the saw, and a fourth pair of rollers positioned to receive a board passing out of contact with the third pair of board flattening rollers and deliver it from the machine.

EDWIN ROBERT EVANS.

JOHN HENRY WALTER EVANS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 726,403 Calhoun Apr. 28, 1903 944,489 Linderman Dec. 23, 1909 1,086,337 Snodgrass Feb. 3, 1914 1,440,762 Berkley Jan. 2, 1923 1,630,832 Jacobowitz Aug. 20, 1927 1,836,499 Poinsett Dec. 15, 1931 2,072,122 Montgomery Mar. 2, 1937 2,260,767 Black Oct. 28, 1941 2,288,988 Blout July 7, 1942 2,313,606 Webb Mar. 9, 1943 2,522,769 Anderson Sept. 19, 1950 FOREIGN PATENTS Number Country Date 338,076 Germany Dec. 11, 1919

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