Патент USA US3050854код для вставки
Aug. 28, 1962 A. A. WAGNER 3,050,844 METHOD OF‘ MAKING END CAPS FOR PIPE RAILINGS Original Filed Sept. 5, 1957 ——/ INVENTOR. Amp/l H. [Mas/veg BY ATTORNEY! United? grates tiatent ‘ice a gestalt Patented Aug. 28, 1962 2 .1. received within the open end of the pipe 13. The end of 3,050,844 sleeve 19 acts as a shoulder to de?ne the seated position of METHOD 9F MAKING END ‘CAPS FOR PEPE RAILINGS the cap therein. . Both members 14, 15 of the composite end cap are Adolph A. Wagner, Milwaukee, ‘Wis, assigner to R &_B Wagner, inc, Milwaukee, ‘Wis, a corporation of Wise desirably fabricated from annular discs substantially iden cousin tical in size and con?guration. Original application Sept. 5, 1957, Ser. No. 682,215, new l’atent No. 2,917,‘!984, dated Dec. 15, 1959. Divided and this application Sept. 14}, 1959, §er. No. 339,130 3 Gaines. (Cl. 29-520) The inner member 14 is formed about mandrel 23 Whereafter outer member 15 is formed about inner member 14 which still retains the mandrel. The die 24 has a cavity 25, the radius of which is slightly smaller than the radius of preformed member 14 plus the thickness of member 15. This invention relates to improvements in a method of making end caps for pipe railings. Inner member 14 is formed with an annular external This application is a division of my copending applica groove 28, somewhat exaggerated in the drawings. In the course of closing the die 24 as shown in FIG. 3, the tion Serial No. 682,213, ?led September 5, 1957, now Patent No. 2,917,084. 15 pressure of the slightly undersized die 24 rolls or ?ows the metal of outer cap member 15 into the groove 28 in Heretofore it has been conventional in the art to weld end caps to close the otherwise open ends of railing pipes. the form of a rib 31 which engages with the groove 28 to interlock the members together. The device of the present invention eliminates the need The manner in which groove 28 is formed is suggested for welding, the novel fabricated end cap herein disclosed being readily secured to the open end of a railing pipe 20 in FIG. 5. In forming the‘ inner member 14, a die 53 engages the blank 22 to bend it at 34. FIG. 5 indicates a with a press ?t. The absence of a weld improves the appearance of the railing. mid-point in the stroke of the die. Even after the die has completed its stroke to straighten out the blank to its My novel end cap consists of mating concentric hemi spherical portions having tangentially extending coaxial tubular form 18, a residuum of the bend 34 remains as 10 sleeve portions. The inner sleeve portion is longer than 25 groove 23. the outer sleeve portion and is telescopically received as a dowel within the pipe railing to connect the cap to the The outer annular edge of sleeve 18 is chamfered or beveled as shown at '32 to facilitate its enrty into the bore - pipe. The outer sleeve portion has its end oifset from of the pipe ‘13. The external diameter of the sleeve 13 the end of the inner sleeve portion to provide a shoulder may be just a tri?e greater than the internal diameter of which abuts against the end of the pipe and de?nes the 30 the pipe 13, thus requiring a press ?t eitected by hammer ing the end cap into the otherwise open end of pipe 13.’ interconnected position thereof. The cap thus has a dou In seated position the parts are securely fastened and can ble wall in the area where the rail is most exposed to injury. not be Withdrawn except with great difficulty. The composite end cap ?ts very neatly on the end of My method of fabricating the end cap is believed to be novel. Both inner and outer cap portions are desirably 35 the pipe railing and there is no Welding bead or the like to dis?gure the joint. The double wall thickness of the cap formed from substantially identical discs or annular is exceptionally sturdy to better absorb such impact shocks blanks. The ?rst blank is formed over a mandrel and the as may be imposed thereon. second blank is formed over the ?rst blank without re I claim: moving it from the mandrel. 1. A method of forming a double walled cap of the Other objects, features and advantages of the invention 40 will appear from the following disclosure in which: character described and comprising the ?rst step of form ing an annular disc over a mandrel and into the shape of FIG. 1 is a side elevation, partly in section, of a stair an inner member having a hemispherical end section and way and pipe railing to which the claimed end cap is applied. a tangential tubular extension, the second step of forming a second ‘annular disc of substantially identical size and FIG. 2 is an enlarged fragmentary cross section taken through an end cap as applied to an open ended railing 45 con?guration with the ?rst disc over the previously formed pipe. FIG. 3 is a fragmentary axial cross section taken through a die set in the ?nal step of forming the end cap. FIG. 4 is a perspective view of an end cap fabricated according to the present invention. inner member to form an outer member having a hemi spherical end section on a radius which is greater by an amount substantially equal to the thickness of the inner member, the end of the sleeve portion of the outer mem 50 ber being axially spaced from the end portion of the inner member, interlocking said inner and outer members be fore removal thereof from the mandrel and removing the interlocked members from the mandrel. 2. A method of forming a double walled cap of the A conventional pipe railing may consist of uprights 1t} 55 character described and comprising forming an annular and cross pipes 11, 12. Pipe 12 may be extended beyond disc over a mandrel and into the shape of an inner mem upright 10, as shown at 13 and in ordinary course will her having a hemispherical end section and a tangential have an open end. In the device of the present invention, tubular extension, forming an external groove on the the open end is closed by my novel end cap which consists tangential tubular extension of said inner member, form of an inner member 14 and an outer member 15. The ing a second annular disc of substantially identical size respective members 14, 15 comprise concentric hemi and con?guration with the ?rst disc over the previously spherical portions 16, 17 and tangentially extending coaxial FIG. 5 is a cross section taken through a die set at an intermediate stage in the formation of the inner cap mem her. sleeve portions 18, 19. Sleeve 18 has greater axial extent than sleeve 19 and functions as a dowel telescopically formed inner member to form an outer member having a hemispherical end section on a radius which is greater by an amount substantially equal to the thickness of the inner 3,050,844 \ 4 I member, the end of the sleeve portion of the outer mem References Cited in the ?le of this patent ber being axially spaced ,from the end portion of the UNITED STATES PATENTS _ inner member, forming an inner rib near the end of the sleeve portion of the outer member into said groove to interlock said inner and outer members, and removing 5 the interlocked members from/the mandrel. 3. The method of claim 2 in which said discs are formed into said members by closing dies over said man drel and between which said discs intervene, said groove being formed 'by the interaction of a ?rst die with the disc 10 for the'inner member and said rib being formed by the interaction of a second die with the disc for theouter I ~ member. 303,222 955,698 1,141,515 1,278,914 1,294,486 1,519,166 "1,570,320 2,270,185 2,915,908 ' Grom et al _____ __' _____ __ AugLS, 1884 Schatz __________ __-_____ Apr. 19, 1910 V ‘ Alve'y ________________ “June 1, 1915 Gmver, ______________ __ Sept. 17, 1918 Kuen ____________ _'_____ Feb. 18, 1919 I Ranch _________ __'______ Dec. 16, 1924 Serewicz ______________ __ Ian. 19, 1926 Dulmage _____________ __ Jan. 13, 1942 Warnkey ____________ __>__,Dec. 8, 1959 '