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Патент USA US3050854

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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
'
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