US 3377903 A
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3,377,903 TO BE SHOT ID METHOD W. E. KORTE G AN ARTICLE BY MEANS OF A BOLT INTO SAID ARTICLE, AND MEANS FOR CARRYING OUT SA April 16, 1968 METHOD OF FASTENIN Filed Nov. 10, 1965 iill INVENTOR 7 J 5 A WilheZmwFremm u: [072-6 Patented Apr. 16, 1968 3,377,903 METHOD OF FASTENING AN ARTICLE BY MEANS 6F A BOLT TO BE SHOT INTO SAID ARTICLE, AND MEANS FOR CARRYING OUT SAID METHOD Wilhelmus Everardus Korte, Meerstraat 3, Naarden, Netherlands Filed Nov. 10, 1965, Eer. No. 507,186 Claims priority, application Netherlands, Nov. 10, 1954, 64-13373 Claims. (Cl. 85-10) ABSTRACT OF THE DISCLGSURE A method and means for attaching sheetlike material to a support by explosively driving a bolt having a screwthreaded end through the material and through a fastening member into the support and at the same time forming internal screw-threading in the fastening member and threadably engaged with the screw-threaded end of the bolt.
This invention relates to a method of fastening an article, such as a plate, to a carrying member, in which a bolt is shot through the article into the carrying member, and the article is locked against the carrying member by fixing a nut or similar, bored fastening device on to the rear end of the bolt. The invention also relates to means for carrying out this method.
As defined in the above terms, both the method and the means are known to the art, and much used for fixing wall, roofs, thin steel or aluminium sheets to steel structures, concrete skeletons, or other support structures. It is an object of the present invention to shorten the time required in carrying out the method, and at the same time to obtain a good attachment. It is a particular object of the invention to render such attachment moreover detachable.
In the method according to the present invention, the fastening device, which consists of material admitting of some deformation, is placed in front of the rear end of the bolt with its bore into-axial relationship to the latter, the diameter of said rear end being in excess of the diameter of said bore, the arrangement being such that, as the bolt is fired, this rear end is also shot fast into the fastening device. When the bolt is fired by means of a conventional gun the fastening element may be placed against the article to be secured at the muzzle of the gun; the fastening device may also be placed about the tip of the bolt and used as a means for guiding the leading end of the bolt in the barrel of the gun. The fastening device is preferably made of a polyamide, such as nylon, or of a synthetic resin having similar properties, and preferably has a flange having a pre-arranged central perforation zone, and a sleeve, formed integrally with said flange and extending oppositely to the direction of perforation. The sleeve may be provided with ribs on the inside, and an annular external groove may be formed in the transition zone between the flange and the sleeve, so that a cap may be placed over the ready connection, to protect the assembly against weather influences, and secured in said annular groove by a shouldered end portion.
The attachment end or rear end of the bolt is preferably provided with screw thread. When this rear end is shot into the fastening device there is formed a counter profile of the threaded bolt end in the material of fastening device, so that the fastening device can again be loosened, if so desired after cutting off the flange portion thereof, if it is desired for a wall or the like to be made accessible again, for example for making changes in a building or a separation, or for making an opening, or otherwise.
The invention will be further described, with reference to the accompanying drawings, illustrating by way of example means for carrying out the method. In said drawings,
FIG. 1 illustrates, in cross-section, a ready attachment;'
FIG. 2 is a cross-sectional view of the fastening device used in the attachment shown in FIG. 1;
" FIG. 3 is a plan view of the device shown in FIG. 2;
FIG. 4 shows the attachment shown in FIG. 1, provided with a protective cap;
FIG. 5 illustrates a phase whilst the bolt is fired;
FIG. 6 illustrates a phase in a slightly different manner of firing the bolt.
Referring to the drawings, 1 designates a bolt comprising a shank 2, a threaded rear end 3, and a tapering front end 4, there being a conical transition portion 5 between the shank 2, provided with a roughening 6, and the threaded end 3.
Referring particularly to FIG. 1, around the parts 3 and 5 of the bolt is a fastening device 7, consisting of a polyamide, such as nylon, which is illustrated by itself in FIGS. 2 and 3. The fastening device 7 comprises a flange 8, having a central zone 9, adapted to be perforated by the tip 4 of the bolt, and a sleeve 10 formed integrally with said flange. The upper end of the sleeve is internally provided with axially extending ribs 11 projecting radially inwardly. During the perforation, the material of the central zone 9 is stretched by the shank 2, 4, 5, and the material of the sleeve 16 is extended to take up the threaded end 3 of the bolt 1, the ribs 11 being forced into the threading. In the condition before the bolt is fired, the flange 8 has a conical undersurface. The conical space defined by this surface and the surface of the article to be fastened, for example, a sheet 12 is partly filled up by the displaced material of the portion 9 and for the rest the flange is forced into surface-to-surface contact with the article 12 by the pressure of the fluted transitional portion 5 and the threaded end 3, so that the whole space between the sheet 12, the fastening device 7 and the bolt 1 is filled, and a firm, stressed attachment is obtained. It is also possible that the material of the central portion 9 displaced by the bolt is forced into the interspace in a thin layer. For the sake of simplicity, this has not been shown in the drawings, which have been kept more or less diagrammatic. The carrying member 13 may be a sheet of concrete or a carrying member of any other material admitting a bolt to be driven into it by shooting.
To facilitate any removal of the fastening device 7, the sleeve 10 is of hexagonal outer shape, as shown in FIG. 3.
In the embodiment illustrated in FIG. 5, the fastening device 7 has been placed in the muzzle of the barrel 15 of a shooting gun aginst the surface of a sheet 12 to be fastened, the central portion 9 extending as a pilot into a hole previously made in the sheet 12, and the bolt being in contact with the leading end of the ram or piston, the latter being shown in an intermediate position as it is fired. The bolt is guided in a manner known per se by means of a guide ring 14, which breaks oif as it is resisted by the member 7. In the embodiment shown in FIG. 6, the flange 8 of the device 7 itself is used as a guide ring for the leading end of the bolt 1, so that the separate guide ring 14 is not used. Depending on the method used, the barrel of the shooting apparatus is different, as shown, for example, in FIGS. 5 and 6'. In FIG. 5, the sleeve 10 of the fastening device is housed with more or less radial play in a recess in the front end of the barrel 15; in FIG. 6 the bore of the barrel 16 is ofsubstantially'uniform diameter, and the leading end of the piston 17 is provided with a chamber 18, in which the threaded end 3 of the bolt is accommodated before the latter is fired. As the threaded end 3 is driven into the sleeve 10, the chamber slides around the sleeve to enclose the same. The chamber it) should naturally have a suitable diameter relative to the original external diameter of the sleeve 1.0. As illustrated, the back portion 19 of the chamber is of reduced diameter for centering the trailing end 3 of the bolt, and the front or leading end of the chamber has a diameter just sufficient to admit some radial expension of the sleeve when the bolt is forced into it. Particularly good results are obtained when the chamber 18, and possibily the sleeve 16 as well, are made conical.
FIG. 4- illustrates how the attachment can be protected from weather influence by the superposition of a cap 2% having an inwardly extending collar 21 fitting an external annular groove 22 of the element '7.
The length of the shank 2 of the bolt 1 is selected in accordance with the thickness of the article to be fastened, which, instead of, or in addition to, the sheet 12, may for instance be a thick layer of insulating material.
It will be evident that modifications and variations of the embodiment described can readily be made by those skilled in the art without departing from the spirit and scope of the invention as defined in and by the following claims.
1. Means for fastening a plate-like article to a carrying member by means of a fastener and a bolt comprising in combination with the plate-like article and support a fastener of deformable material having a sleeve-like body with an open end and a flanged end opposed to said article and including a protuberance engaged in the article aperture, said bolt having an impaling end presented toward the body protuberance and an enlarged externally threaded end extending away from said impaling end, a barrel element having boring therein in which to receive the fastener, and a plunger element forcibly movable in the barrel element to shoot the impaling end of the bolt through the sleeve and into the support and the threaded end of the bolt into the interior of the sleeve-like body of the fastener, one of said elements including boring therein dimensioned to receive and exteriorly embrace and confine said sleeve-like body of the fastener as the bolt end is being shot through the sleeve whereby to cause the threaded part of the bolt to deform the interior of the sleeve-like body during said bolt shooting into internal threading mating with the external threading of the bolt.
2. Means as defined in claim 1 wherein the boring dimensioned to receive the sleeve-like body of the fastener is provided in an end of the barrel element engaged with the plate-like article.
3. Means as defined in claim 1 wherein the boring dimensioned to receive the sleeve-like body of the fastener is provided in an end portion of the plunger element engageable with the threaded end of the bolt.
4. Means as defined in claim 1 wherein the sleeve-like body of the fastener is provided adjacent its open end with interiorly projecting protuberances which facilitate the deformation of the interior of the sleeve-like body into said bolt mating threading.
5. Means as defined in claim 1 wherein the exterior of the sleeve-like body of the fastener is non-circular to receive a manipulating wrench thereon.
6. Means as defined in claim 1 wherein the exterior of the sleeve-like body of the fastener is provided with a groove adjacent the flanged end and in which is removably receivable a retaining portion of an overcap formed for extending over the open end of the sleeve-like body and the threaded end of the bolt therein.
7. A disconnectable connection between a solid support and an initially unthreaded sheet-like article, comprising a bored fastening member composed of deformable and reboundable elastic material, a bolt having a screw threaded rear end and an impaling front end, said screw threaded rear end being of a diameter greater than that of said initially unthreaded bore, said bolt having its impaling end driven through the bore of said fastening member and through said article fixedly into said support and its screw threaded rear end thus substantially non-rotatably forced into the bore of the fastening member and deforming said bore to provide therein an internal screw-threaded counter-profile whereby the fastening member can be unthreaded as desired to remove the fastened article from the support.
8. The method of fastening an article such as a sheet to a solid support, comprising placing a fastening member against one face of said article and the opposite face of the article against said support, said fastening member being provided with a bore and consisting of a material subject to elastic deformation, placing a bolt having a piercing front end and a screw-threaded rear end c0- axial with said bore in said fastening member, the outer diameter of said threaded rear end being in excess of the inner diameter of said bore, and substantially non-rotatably driving said bolt to force its piercing front end through said fastening member and said article into said support and said threaded rear end into the bore of said fastening member to form in said bore an internal screwthread counter profile mating with the threading of the bolt whereby the fastening member can be unthreaded as desired to remove the fastened article from the support.
9. The method of claim 8 wherein the fastener employed is formed of a polyarnide or similar deformable material.
10. The method according to claim 8, in which the fastening member during the penetration of the threaded rear end is enclosed and confined against outer dimension expansion by a surrounding wall in radial juxta-position to the thread of said threaded rear-end.
References Cited UNITED STATES PATENTS 1,759,917 5/1930 Ross -55 1,984,117 12/1934 Davis. 2,666,252 1/1954 Temple. 2,675,607 4/1954 Catlin. 2,887,925 5/ 1959 Kopf. 2,954,717 10/ 1960 Henning et a1.
FOREIGN PATENTS 184,524 1/1956 Austria. 993,021 5/1965 Great Britain.
CARL W. TOMLIN, Primary Examiner.
EDWARD C. ALLEN, Examiner.
R. S. BRITTS, Assistant Examiner.