US2550937A - Punching tool - Google Patents

Description

C. F. PYE

PUNCHING TOOL May 1, 1951 Filed Nov. 1, 1948 Emventor Patented May 1, 151

- asse i ,PHNQHINAG 19.9! .cm Byeiwinnineg, Manitoba; al ade .arpliszetit lls em s 1, 12 e l9 .l,i8

1 in e in n t b t an ad ntage 9 the invention, a short description of the manufacture of composition roofing is advisalole for a clear understanding.

A roll of heavypaper is fed into a=long machine somewhat of the type of a newspaper printing pressbut of heavier construction. After passing through several rollers for specific purposes it is passed through a deep bath of composition asphalt or tar at a temperature of r un 5 0 F- he ter hi c mpos ti n will be referred to as tar. In going through this-bath the paper is completely impregnated with the tar.' "It then passes throughrollers which remove the surplus tar and standardize the thickness. --It is then positionedtdhangin long loops which slowly move along the which permits the tar to cool before goingthrough the balance of the machine. JEhe paper is'then re-coatedwith a-thin layer of tar athigh temperature, one side receives' ahlast of powder whichdries that side of the" paper ior' smooth movement overt-he rollers while-the other side is sprayedwithfine graveL- usually colored which adheres to the hot "tar. It thenpasses through rollers which press the gravel into the paper andi-t is essential that'tlie hot ;ta-r he 'at a oer-'- tain high 1 temperaturein order that the gravel will-be properly bonded thereto thispress ing operation. The paper is then cooled; and

passs along the mach-ine for-various cutting oiperations which result in {thefini shed Thetotal lengthof paper passing throughthe machine-amounts to a considerable-numberof rolls of the usual length.

-A s-'the machine is operated; the worlgmen at the side ofthe machine are constantly opserving the conditionsof the paper and i'f-they ob-" serve a-tear starting, the machine is a fefully. slowed down-untilthis tear has passed through. The slowing down ofthe machine is a very deli cate' operation as the temperature of -the'--tar falls fast and,-ev-en withthegreatestof careit frequently cools before the gravel is pressed therein with theresult that the favel doesnot become bonded. Accordingly all the paper ill this, condition is useless: for roofing purposesand must "be discarded. =Further, if tlie slightesttea-r isfnot observed quick enough, thewhole sheet may .tear acrosswhich --requires the-shutting down of the machine and again-a large amourlt" of roofing :is .unusable.

*I-n the-pastth-is unusahle roofin was formed into rcl1s--and'-sent-to the nuisancey groppd for disposal. Unfortunately, it ioun'd its way back ame trade then paid {or the removal of the roofing and its burning which was extremely costly Narious means-were employed to muti late the rolls sothatthey could-not-be used for roofing. l hey endeavoredto shear the rolls but the may smeared and chilled the-blade while the stones, acting as anabrasive,- broke the blade. Punches were used -to punch holes through the mine" but the hardest steelbroke. Drilling-holes throughtal c rolls was attempted ;but the drills filled with tar and -the abrasive action of the" gravel-wore away-the steel ina-very short Ajn acetyline-tcrch-was-used -'to mutilate spots tnrouglr-therolls -but theingredients in the tar,

in mixing with the ox vgen, reduced-the hot flame to thesimilarity of an. oi1-lamp. The insulating electric torch. V

-T he object of the preseri'tinvention-iS-to pro' propertiesof "the 1 tar prevented the use of an vide a pilmch eta pecial eesign which will' tear a 'holethrough-a-rdll of compo'sition roofing with Aiurtherpohjeet of the invention is to design the -tool such that =i-t .will receive ver-y little abrasive resistance Jrommherolls, is .self clearing'aanmwilll stand unto the work for a long period ofw-time.

A further object o-f-the inventionisto design the tool so that the resulting hole punched through"theroofing-will have-' the edges formed in af-nesting shapefto loclrthe roll-from unwinding.

A -furthe'rdebris collecting aroundthe -machine.

"f t 'J t o th zie tie 1 t t en struc-t the toc'lisuehthatfit will' han dle rcllspf difierent sizes.

with the eeer 'gimeo teii and ether rare objects in view which will'becomemore appafr entl as -thedeseription proceeds; the invention consists essentially inthe construction @Qdai t I. .i i ze i qws V h r-flam ..9 ih..t e@h .a;i showing'the-tool andbearing in side elevation.

eb jeet of-the invention is t ;qesigil the toolsoithat it will produce the 11 1a without loss -of the material and accordingly without I Figure 2 is an enlarged side view through the tool and a vertical section through the bearing therefor.

Figure 3 is an enlarged perspective view of the head of the tool.

Figure 4 is a diagrammatic view of a roll of composition roofing after the tool has passed through.

Figure 5 is a diagrammatic view of the upper part of a roll of composition roofing after the tool has been drawn back through same.

In the drawings like characters of reference indicate corresponding parts in the several figures.

A pair of horizontal channel irons l are suitably fastened to and support a-pair of spaced vertical channels 2 which are connected by a further higher horizontal channel 3. These channels form the lower framework of the machine.

A pair of angles 4 are supported by the channels l. A horizontal channel 5 is secured across the angles 4 and is aligned between the channels 2- to form a base with a central opening 6 therein. Rollers I are carried by the angles 4, on either side of the base channel so that rolls of composition roofing can be pushed across the rollers between the channels 2 and over the opening 6.

A guide casting 8 is carried by the channel 3 in a position directly above the opening 6. This casting is tubular with the upper end being of smaller diameter thanthe lower end so that it can he slid up througha central opening in the channel 3 until the shoulder, indicated at 9, is

reached and the casting is then welded as at It) to the channel 3. The upper end of the casting is provided with a long bronze bushing II which is suitably secured in the casting as by set screws l2 and it slideably receives the shaft 13 of the punching tool. The lower end of the casting is hollow to receive a plurality of felt washers l4 whichencirclethe shaft l3 and are pressed firmly up in the casting. Asuitable piping l5 screws into the casting 8 opposite the felt washers and the outer end passes up through the channel 3 to alarge oil cup 16 so-that oil can be constantly fed to the felt washers. r

The lower end of the punch shaft [3 is slightly enlarged to, forma head I! having an upper shoulder 18. This head is circular and the lower end is forged into a chisel shape as indicated at l9. Each end of the chisel knife projects out-.v wardly in the form of a bead 20...v These beads are a;continuation of the knife blade.

A further pair of angles -2l are carried on the interior of each of the channels 2 between the channels 1 and 3. These channels are spaced apart to receive the ends of a cross channel 22.

which passes directly under the punch head, I!

and is provided with an opening 23 through which the punch can travel. It will be noted that the opening 23 is of larger diameter than the open-. ingfi in the base channel. l ;-shaped rods 24 pass through the angles and through the ends of the channel 22 to retain said channel in position but when the rods are withdrawn. the channelcan beremoved from the machine. I

By observing the bearing formed inthe guide casting shown in Figure 2 it will be seen that the punch shaft l3 ismounted for vertical sliding movement through the bushingll. In the machine I have made, this movement is controlled by a hydraulic ram which can be operated in either direction as desired by manual control. As the operation of a hydraulic ram attired? is well known, I have not shown the construction thereof and in this connection it might be mentioned that any means for reciprocating the shaft l3 can be employed such as hydraulic, mechanical or electrical operations.

In operation and assuming a small roll is to be punched, it is placed on the rollers l as indicated at 2'5 and pushed over the channel 5 until one end is over the hole 6. The control (not shown) is operated to move the punch l3 down. The chisel head of the tool flattens the roll down until it takes the shape shown in Figure 4, squeezing the center part of the roll against the channel 5. At this time it might be mentioned that the gravel side of the roofing is on the inside of the roll so that the tool is pressing against the tar side. The chisel point then presses and cuts a line slit in the roofing and the beads 20 have a tendency to tear. As the tool continues through the different layers, one layer after another becomes out and the edges are pushed downward as indicated at 26, the last few layers passing through the holes 6 in the channel 5. As the tool passe through the hole formed in the roofing, the upper part of thehead, being of a larger diameter, spreads and pressesthe opening larger with the result that tears occur all around the hole. In this connection it might also be mentioned that as the gravel is on the inside of the roll, it is pressed outward away from the tool so that for the first half of the roll the tool head is passing by the tar and is protected against the abrasive action of the gravel and receives practically no wear; Further, the tar from the upper part moves down and covers a certain amount of the gravel on' the lower half of the roll so that a minimum of gravel abrasive is encountered by the tool. When the head of the toolhas passed through the opening 6 it stops at the end ofits travel. The operator then 'reverses the control (not shown) and the tool 557 passes out through the opening 23 in the chanmachine ready for the next roll.

starts thereturn movement back up through the roll. A allthe edges of the opening formed in the roofing are pointing down, they encounter the shoulder of the head ofithe' tool. Accordingly this shoulder lifts the roll upward until it contacts thechannel2 2iand then starts to press the edges of the hole upward. This reverses the shape of the roll. The flattened portion forms at the top and the roll is again squeezed in the center-Ll Asjthe tool moves upward the upward pressure against the-edges of the holes through the roofing causes them to take an ogee or serpentine shape as shown at 2'! in Figure 5 until the edges slip past the head of the tool and it nel 22 leaving the roll of roofing therebelow. This ogee shape is possible because the opening 23 larger than the opening 6. The roll is then pushed through the machine to the center where -a.. second hole is pressed through and then a third hole is passed through the opposite end. Thesethree holes are usually sufiicient to mutilate the roll so that it cannot be used for roofing purposes. The roll is then pushed out of the Ifa large roll is tofbe punched, the L-shaped rods are withdrawn andthe channel 22 removed from the machine. This permits a large .roll, indicated by the reference numeral 28, to be placed on the rollers l between the guide casting guide casting acts in the same capacity as. the.

the guide casting. While I have only shown one channel 22, it will be understood that several might be employed at different heights for varying sizes of rolls. 1

By the above method it will be seen that the shape of the tool head permits pressing of a hole completely through a roll of roofing by the act of tearing in such a manner that very little abrasive action results against the tool and it will last indefinitely. Further, the movement of the tool is direct through the roll and without rotary or other movement to insure that very little abrasive rubbing will occur. A further advantage of this construction is that no material or at least very little, is lost as the material cut is merely displaced and does not tear off. Accordingly, the floor around the machine is not littered with pieces but the roll is ruined for its original purpose. Although very little abrasive action occurs against the tool the extreme pressure of the roofing against the tool causes a certain amount of tar to adhere to the tool head and the shaft l3. This in time would accumulate and have to be manually removed. To avoid this operation the felt washers I4 have been inserted in the guide casting. In the operation of the machine a proportion of the tar piles up inside the guide casting and this holds the felt washers firmly in place. The cup I6 is filled with oil, preferably coal oil and this coal oil runs down the pipe l5 into the felt washers. Accordingly, as the shaft 1 3 is moving up and down it is constantly running in the coal oil which has a cutting action against the tar adhering to the shaft [3. As the shaft 13 moves through the roofing, the friction of the roofing, plus the cutting action of the coal oil maintains the said shaft l3 in a relatively clean condition.

.While the beads have a tearing action on the roofing when the tool is going therethrough and the enlarged part of the head of the tool tends to split the edges of the hole thereformed, this action could be speeded up by forming .more such beads around the upper part of the head of the tool such as those indicated by the dotted circles 29. This would have a tendency to relieve pressure from the tool in its movement through the roll. Should these beads wear off it would be a simple matter to meld new material thereon and this could be done while the tool is on the machine.

From the above disclosure it will be seen that I have invented a tool which fulfills a long felt requirement. As mentioned in the preamble, various methods have been employed to mutilate composition roofing without success due to the viscosity of the material, the abrasive action of the gravel. the composition of the material and the possibility of fire. With the design of this device all these hazards have been reduced to a minimum. The vertical movement of the tool permits the shortest possible movement of same through the roll. The method of operation and the design forces the tar against the gravel and so reduces the abrasive action thereof. The tearing action reduces the resistance so that the tool does not break in performing its function and the return movement of the tool forms the edges of the hole into a nesting shape and prevents the roll from unwrap-ping. The friction is never sulficient to ignite the material, and lastly; the coal oil keeps the tool clean. As the roll is still warm when the punching operation takes place, the tar is plastic and would smear and dullany kind of a cutting blade. As this kind of punching is accomplished by tearing, the material being soft and pliable is in an ideal condition for the purpose and can be torn with a minimum of power outlay. When the roll is removed from the machine, its natural resilience brings it back to the circular shape which is a very compact form and the easiest method vloy which such roofing can be handled. The tar later hardens in the nested shape to firmly hold the rolls from unwrapping. The operation of the tool results in a roll which cannot be re-placed on the market to endanger the reputation of the good material produced and it can therefore be transported to the nuisance grounds without fear and at small cost, or used for other purposes, or for burning.

In the present disclosure, I have shown and described the head of the tool as chisel-shaped. That is, a single blade. The advantage of this type of tool is, that it can be easily sharpened and maintained in good repair. A diamondshaped head, that is one having three or more equi-spaced blades projecting from the center might offer a better cutting and spreading action and could be used very advantageously for the purpose in place of the chisel-shaped one described. Accordingly, it will be understood that I wish the words chisel-shape to include such shape variation, above mentioned, when the scope of the claim is considered. The reason I have not used this cutting edge is that it takes more work to keep in repair and sharpened, which increases the expense of operation.

What I claim as my invention is:

A punching tool for mutilating roofing rolls, comprising: a shaft vertically mounted on a framework for reciprocating movement of one end thereof into and through a pair of openings positioned in aligned spaced relation in said framework; means for supporting a roll of roofing between the openings in said framework; said end of said shaft provided with an enlarged head to form an outer shoulder on said shaft; the working face of said head formed in a chiselshape; outwardly projecting beads formed around said head; each of said openings being considerably larger than said head so that said head, in its downward movement, will pass through one opening, tear through said roofing roll, pressing the torn edges of the holes so produced downwardly and then pass through the second opening, with suiiicient clearance therebetween for the torn edges of the lower holes to project downwardly therein as said tool passes therethrough; said opening above said roofing roll of larger diameter than said lower opening so that, on the return up movement of said head, said shoulder will contact said downwardly projecting edges and b nd same u wardly as said head passes therethrough and press the upper layers of said torn ed es into s id unoer o ening to form an ogee ne ting shape to said edges and lock said roll from unwinding.

CARL F. PYE.

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

UNITED STATES PATENTS Number Name Date 999,824 McCampbell Aug. 8, 1911 1,179,476 Thomas Apr. 18, 1916 1,420,252 Goehr June 20, 1922 1,884,001 Lewis Oct. 25, 1932 2,088,807 Palo Aug. 3, 1937

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