US1299232A - Art of fastening sheets together. - Google Patents

Description

H. ROSENBERG.

ABT or FAsTENlNG SHEETS TOGETHER.

APPLICATION FILED AFRV. I6. |917.

Patented Apr. 1,1919.

4M eltlfozuaq.

willy/Il l UNITED STATES inlrirEia'i oEEioE.

IEEYMAN BOSENBEBG, OF NEW YORK., N'. Y.

To all whom t may concern.' I

Be it 'lmown that'I, HEYMAN RosENBEno,

a citizenof the United States, residing at New York, in the county -of New York and State of New York, have invented certainA Anew and useful Improvements lin the Art of Fastening Sheets Together; and I do' hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to 'which it appertains. to make and use the same.

This invention relates to improvements in the art of fastening together sheets of metal and other like relatively thin sheets of.`

material. p ,y

The object in view is to easily, vquickly and permanently fasten together in a simple and inexpensive manner a plurality of sheets of relatively thin material such as sheet iron and the like.

With this 4and other objects in view, as

will in part be stated and in part hereinafter become apparent, the invention comprises certain improved steps andl combinations of steps in the art of fastenin togetherv relatively thin sheets of materia? as will be subsequently specified and claimed.

In the accompanying drawin Figure 1 is a view 1n side e evation of a screw such as is particularly well'adapted vfor carrying out the preferred combination of steps of the present improvement in the art of fastening together relatively thin sheets. j

Fig. 2 is a sectional view through two sheets with a tool indicated in elevation in position for beginning the -rst step of the art or process.

Fig. 3. is a similar view of the same with the parts in the position durn the carrying out of the prooe such as may;l e designate as the completion of the rst stieg.

Fig. 4 is a view similar to g. 3 of the parts after the tool has been removed.

Figs. 5 and 6 are similar views, the former showin an intermediate step, and the latter the prouct upon completion of the process.

Fig. 7 is an enlarged, detail fragmentary view of the parts as seen in Fi 6.

Fig. 8 is a view similar to Fig. 6 showing more than two sheets connected together.

In the art of fastening together metallic sheets, various methods have been proposed land the one usually preferred for such oonstruction work as cornices and metal trim on buildings, housings for blowers, and elsespeomcauoa er Letters Patent.

A31' or FAsTEmive. SHEETS TOGETHER.

where where for various reasons it is im# practicable or undesirable to use solder, has been to employ bolts of the machine screw type engaging the plates atone face by the head of the bolt and at the other face by the nut of the bolt. Much diiculty has been experienced in fastening together sheets in this manner, 'both from the fact that it is frequently difficult to provide access to the nut, and lfrom the fact that variations in temperature and vibrations cause the nut toL loosen.

The object of the resent invention is to overcome yall these diiculties by employing v a method of connection which eliminates the need for machine thread, eliminates the nut, and produces a connection which is stable in every respect and which throughout long and careful tests has proved to remain absolutelyl tight notwithstanding vibrations and temperature variations. p

The steps of the present improved process or art, and one specific sequence or coinbination thereof, may more readily be 4ren- 80 dered clear. by reference to such structural formations as are effected by the process as, forv example, such as is illustrated in the accompanying drawin in which 1 indicates the body of a screw w ose thread 2 is of the 85 form and pitch of what is known as a.wood screw by which is meant the commercial iron screw adapted for use in wood. The body 1 tapers to a point at one end and at the other end is notched head 3. n other words, the screw is of the shape of the ordinary commercial wood screw, but differs therefrom in 'the fact that the screw is made of Steel andthat the thread 2 is hardened 'preferabl special case-hardening process, as y the known cyanid recess oritsequiv-alent. The structure of t e screw, therefore, consists essentially of a body whose thread is hardened while there is no attempt ator need '100 .for hardening of the body. Incident to the treatmentin hardeni the thread 2, the surface of the body of t e screw may also be l hardened, but that is an incidental result and not one necessar to the effective operation of the screw, t e essentiar'sieed being that the thread itself shall be li 'rdened and provided with a cutting ed e, su'ch as seen at 2' in Fig. 7, and that t e body of the screw shall terminate in a tapered end with y the thread correspondingly tapering.

The sheet material to be QQIlllected together.

' Patented Apr. 1, 1919. Appnoaudainiea April is, i917. 'serial No. 162,488. i

rovided with the usual 90 i byaes may have quite a wide variation in thickness, but is usually sufficiently thin to be susceptible of perforation by some form of punching apparatus whether manually or machine operated. Perhaps the widest iield of utility of the present improvement in the art nds ap plication in the connecting of relatively thin sheets of material such as galvanized iron,

ordinary sheet iron, and tin coated or plated iron, commonly known as sheet tin, and like thin sheets of material, but it will become obvious that the invention is just as applicable to sheets of material having greater thickness. For the sake of illustration, however, I. have selected the thinner sheets for disclosure of the invention herein, and to this end it will be noted that the two sheets of metal 4 and 5 are arranged in contact face to face, and the tool, 6, which in the present instance is an ordinary hand punch having the usual limiting shoulder 7 is arranged with its point in contact with the-plate 4 in position for penetrating the two plates. A blow on the punch 6, as by a hammer not illustrated or force otherwise applied, causes the punch 6 to penetrate the sheets 4 and 5 until the punch assumes the position indicated in Fig. 8, resulting in the perforation of the ltwo sheets and the formation of a bunon each, the two burs being nested as clearly seen at 4 and 5 in Fig. 4. The penetrating point portion of-the punch 6 is of less diameter than the diameter of va circle' such as would touch diametrically opposite points of any helix of the larger portion of the thread 2, and is vpreferably of approximately the size of the body l, so that the screw cannot be introduced into theopening surrounded by the burs 4 and 5 except by revolving the screw and thus causing thev thread 2 to cut a corresponding or female thread in the burs 4 and 5. As the thread 2 is tapered to the end of the body 1 the thread has an excellent opportunity to enter and get an eifective start in the cutting of a female thread. For thin sheets of metal, it is usually sufficient to provide an ordinary hand-operated screwdriver for revolving the screw and thus Y threading the same down from the position indicated in Fig. 5 to the position indicated in Fig. 6, that is, the screw is threaded home and made tight. In doing so, the female thread is cut in the inner face of the bur 4 across the edge ofthe bur and across the edge of the bur 5 which slightly underhangs the edge of the bur 4 so that the thread of the screw assumesthe position with respect to the bur seen in detail in Fig.. 7. The head.

3 resting on the upper surface of the plate 4 and the thread 2 engaging the edge of the br 5 coperate to prevent separation of the s eets.

It should be observed that in the carrying out of the process or art one of the essential steps 1s the penetration or cutting of the being of the thread of the screw, and the thread metal of the sheets by the thread of the screw without appreciably varying the condition of that thread. This feature of the improved art cannot be accomplished with an ordinary wood screw or any screw having a soft thread. My experience after long and thori ough testing has been that a screw having a soft thread may be used to connect sheet metal, but the soft threads usually suffer as much cutting away or abrasion as do thel sheets which the thread engages, and the result is that the soft threaded screw will not hold, whereas the result of the present improved art including that Apenetration or cutting of the metal of the sheets which occurs from the use of hardened threads is such that the sheets are permanently secured together against disconnection under the most severel trying conditions.

' It should e obvious that this invention is not limited to the art of connecting any specific number of sheets, since the same steps threading a screw having a hardened thread.

through the burs to a position with the thread in engagement with the burs in a manner causing the thread to cut into `the material of the sheets for retaining the sheets against separation.

2. A process of securing together a plurality of metallic sheets comprising forming an entering opening through the sheets and forcibly threading a screw having a hardened thread into said opening, the screw having a thread proportioned with respect to theV entering opening to outstand beyond 311e same and to cut into the material of the 3. A process o f securing together a plui rality of metallic sheets comprising perforating 'the sheets to form an entering opening therethrough and forcibly threading into said opening a screw whose thread is hardened and of substantially high pitch and proportioned wlth'respect to the opening such as to have the edges of the thread extend laterally beyond the opening and to cut iro thematerial of the sheets.

an entering opening` through t e sheets, placing in the opening the smaller end of a tapered screw and forcibly threading the screwA home into the openlng, the opening of less diameter than the main portion ss of securing together a plu-AA rality o `metallic sheets comprisin forming iso of the screw being of harder material than the sheets and cutting intothe sheets as the screw is forcibly threaded home.

5.]A process ,of securing together a pluralty of metallic sheets comprising forming an entering opening through the sheets, positioning in the opening the pointed portion of a screw of the conventional wood screw shape but having a hardened thread and forcibly threading the screw into vthe opening, the opening being of less diameter than .that of -the larger portion of the screw thread so'as to cause the thread of the screw to cut into the material of the sheet metal.

6. A process of securing together a plurality of metallic sheets comprising perforating the said sheets and forming nested sheets surroundtion the point portion of -a screw of the shape of a conventional wood screw and having a hardened screw thread, the perforation being of less diameter than the larger portion of the screw thread= and forcibly threading the screw through said perforation to a position with the head of the screw engaging that one of vthe metallic sheets first approached by the screw while the thread of the screw engages and-is embedded in the material of the burs.

7 In the art of fastening together sheets of metal, forming an entering opening thro'ugh a plurality of such sheets in contact with each other, placing in said opening the tip of a screw conformmg generally in ody and thread contour with that of a wood screw and having the thread hardened and 'extending substantially from the tapered tip HEYMAN RosENBERG.

i Witnesses:

ALMoN B. CALKINs, MARCEL SENER.

DISCLAIMER 1 ,299,232*.-Heg/1mz'n,l Rosenberg, New York, N. Y. ART 0F FAS'rENrNcr SHEETS TOGETHER. Patent dated April l, 1919. Disclaimer filed March 28, 1932, by

. the patentes and the exclusive licensee, Parker-Kalou Corporation.

Hereby enter their disclaimer of said claims 1 2, 3, 4, 5, 6, and 7 of said United States Letters Patent No. 1,299,232, which claims are in the following words, to wit: 1.. A process, of securing together a plurality of sheets of material comprising perforatingthe sheets in a manner forming nested burs surrounding the perforation and threading a screw having a hardened thread through the. burs to a position with the thread in engagement with the burs in a manner causing the thread to cut into .the

material of the sheets for retaining the sheets against separation.

2. A process of securing together a plurality of metallic sheets comprisingforming an entering opening through the sheets and forcibly threading a screw having a hardened thread into said opening, the screwvhaving a thread proportioned with respect to the entering opening to entstand beyond the same and to cut into the material of the sheets;

3; A rocess of securing together a plurality of metallic sheetscomprising perforating t e sheets to forman enteringopening therethrough -and forcibly threading into said openinga screw whose thread is hardened and ofsubstantially high pitch 'and pro ortioned with respect to the opening such as to have the edges of the thread extend aterally beyond the opening and to cut into 'the material ofthe sheets.

'4. Afprocess of securing together a-plurality of metallic sheets comprising forml lng an entering openingthrough the sheets, placing in the opening the smaller end of ,a tapered screw and forcibly threading the screw home into the opening, the opening being of less diameter than the main portion of the thread of the screw, and the thread ofthe'screw being of harder material than the sheets and cutting into the sheets as the screw is forcibly'threaded home.

. 5. A process of securing together a plurality of metallic sheets comprising forming an entering opening through' the sheets, positioning in the opening the pointed portion of a screw of the conventional wood screw shape but having a hardened threadand forcibly threading the screw into the opening, the opening being of less diameter than that of the larger portion of the screw thread so as to cause the 'threadforating t of the screw to cut into the'material'ofthe sheet metal. 6; A process of securing together a plurality of metallic sheets comprising pere saidsheets and forming nested burs in the material of the sheet surrounding the perforation, placing in the perforation the point portion of a screw of the shape 'of a conventional wood screw and having a hardened screwthread, the perforation .being ofless diameter than the larger portion of the screw thread, and forcibly threading thescrew through said perforation to a positionv with the head of the screw vengaging that one of the metallic .sheets first approached bythe screw while the 'thread of the screw engages and is embedded in the material of the burs.

A7. In the art of fastening together sheets of metal, forming an entering opening through -a plurality of su'ch sheetsin contact 'with each other, placing in said opening -the-V tip of' a screw conforming generally in body and thread contour with that of a ,wood screw and having the thread hardened and extending substantially vfrom the tapered'tip to the hea of the screw, the entering opening being of substantially no greater diameter than the body of the screw, and forcibly rotating the screw until the hardened thread thereof cuts its way in the material of the sheets to a point 0f contact o f the head of the screw with one of the sheets.

[Qcid Gazeta Aprill?, 1.932]

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