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Патент USA US3089171

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May 14, 1963
E. P. SUNDHOLM
3,089,161
METHOD OF FORMING AN INTERNALLY THREADED, GASKET-RETAINING CAP
Filed Feb. 11, 1960
2 Sheets-Sheet 1
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ATTORNEYS.
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May 14, 1963
E. P. SUNDHOLM
3,089,161
METHOD OF FORMING AN INTERNALLY THREADED, GASKET-RETAINING CAP
Filed Feb. 11, 1960
2 Sheets-Sheet 2
ATTORNEYS.
United States Patent 0 "ice
3,089,161‘
Patented May 14, 1963
1
2
3,889,161
is also indicated in dotted lines. This view also illustrates
the relationship of the piece 10 and the mandrel 11 to
the rollers 12 which are disposed around the projecting
METHOD OF FORMING AN INTERNALLY
TI-HIEADED, GASKET-RETAINING CAP 1
Edwin P. Sundhoim, Albert City, Iowa
Filed Feb. 11, 1960, Ser. No. 8,038
3 Claims. (Cl. 10-152)
or free end of mandrel 11. It will be understood that the
apparatus of FIG. 1 is merely being shown as an illustra
tion of one type of apparatus which can be used in con
nection with the method of this invention.
The cylindrical metal piece 10 is shown in greater
This invention relates to a method of forming an in
detail in FIGS. 2 and 3. The piece has smooth side walls
ternally threaded, gasket-retaining cap. The method is
particularly advantageous for the manufacturing of dis 10 13 and one closed end 14 since the cap to be formed from
piece 10 is intended for use as part of the dispensing
'head of a grease gun, the piece is provided with a point
projection 15 and a ring projection 16 for use in attach
ing the cap to the high pressure cylinder as described in
;described a grease gun which is adapted for use with both
cartridge-packaged greases and bulk-?lled greases. Here 15 greater detail in my Patent 2,436,701. There is also pro
vided a raised portion 17 for use in mounting a grease
tofore the caps for the dispensing heads of this type of
gun ?ller ?tting.
grease gun have been provided with internal threads by
In the ?rst step of the method, as shown more clearly
means of a conventional thread cutting tool, which cuts
in FIG. 3, the metal piece 10 is positioned on the outer
the threads by removing the metal in the usual way. To
free end of the [cylindrical mandrel 11. The projecting
assure a seal between the forward end of the grease gun
end portion of mandrel 11 is provided with a threaded
barrel and the inside of the cap, it has been the prac
band 18. As will be noted, band 18 is adjacent the free
tice to utilize a gasket or washer which is received with
end of mandrel 11. Preferably band 18 is spaced inward
in the cap and held in place by the inwardly crimped
ly from the free end. In the illustration given, a smooth
‘forward end of the grease gun barrel. When cartridge
packaged greases are employed, however, the inward 25 surfaced annular portion 19 is provided between threaded
band 18 and the end of mandrel 11, the portion 19 hav
crimping of the grease gun ‘barrel is not particularly de
ing an external diameter not greater than the deepest cut
sirable since it tends to hold the outer walls of the car
portion of band 18, that is, the diameter measured across
tridge away from the inner Walls of the grease gun bar
the mandrel between the roots of the threads.
rel. But if the crimp is eliminated, dii?culties are en
The correct initial positioning of the cap 19 in relation
countered because the gasket tends to become unseated 30
to the mandrel 11 is shown in FIG. 3. As shown there,
and to work itself into the ‘forward end portion of the
the positioning should be such that the closed end 14 of
grease gun, especially when the gun is being used alter
the piece 10 abuts the free end of the mandrel with the
nately with bulk-?lled greases and cartridge-packaged
threaded band 18 being opposite the innermost portion of
greases. What is needed is some means of positively re
taining the gasket within the cap, but it is not feasible to 35 the side walls 13. To accomplish this positioning, it will
be apparent that the projecting end portion of mandrel 11
machine a groove within the cap either prior to or sub
including threaded band 18 must have a slightly smaller
sequent to the threading operation.
maximum external diameter than the internal diameter
It is therefore a principal object of this invention to
of the cylindrical walls 13. In other words, as shown in
provide a method of forming grease gun caps which are
adapted for use with guns using cartridge-packaged 40 FIG. 3, the piece 10 will be loosely received on mandrel
11. As previously indicated, the extreme outer end por
greases. More specifically, it is an object of the present
tion 19 of the mandrel is preferably unthreaded, and will
invention to provide a method of forming internally
be spaced inwardly from the adjacent surfaces of walls 13.
threaded, gasket-retaining caps which can be employed
The next step in the method is shown in FIG. 4. In
for such grease guns or ‘for other purposes. Further ob
jects and advantages will be indicated in the following de 4.5 this step rollers, such as rollers 12, are applied to the out
side of the innermost portion of side walls 13‘ to force
tailed speci?cation.
this portion of the side wall against the threaded band
The invention is shown in an illustrative embodiment in
18. In practicing the method of this invention, it is es
the accompanying drawings, in which—
sential that the application of the rollers begins at an
FIGURE 1 is a side elevational view of an apparatus
50 inwardly spaced distance from the free end of mandrel
which can be employed in practicing the method;
11, as indicated in FIG. 1 and shown more clearly in
FIGURE 2 is a front view of a cylindrical metal piece
(FIG. 4. ‘In the illustration given, the rollers 12 are
from which the cap can be formed, the view showing the
provided centrally with an annular recess 20, and an
closed end of the piece;
outwardly projecting end portion 21. In carrying out
FIGURE 3 is a side sectional view of a metal piece like
pensing head caps for cartridge-loading grease guns.
In my copending application, Serial No. 785,689, ?led
January 8, 1959, now U.S. Patent No. 3,059,819, there is
the one of FIGURE 2 and showing a portion of a mandrel
the method, the projecting roller portion 21 is aligned
with the threaded band 18 of the mandrel, while the un
inserted within the open end of the piece, the piece and
threaded end portion of mandrel 11 is positioned op
mandrel being shown as they would appear when the
posite roller recess 20.
'
mandrel is ?rst inserted;
FIGURE 4 is an enlarged side elevational view showing
When the rollers 12 are applied in the manner just
certain components of the apparatus of FIGURE 1 in 60 described, the application of the rollers begins at an in
section, and illustrating the way in which the cylindrical
wardly spaced distance from the free end of the mandrel‘.
metal piece of FIGURES 2 and 3 is formed into an inter
In this way, the portion of side walls 13‘ adjacent the
nally threaded, gasket-retaining cap;
free end of mandrel 11 remain spaced from the mandrel,
FIGURE 5 is va view similar to FIGURE 3 showing the
as indicated in FIG. 4 at 22.
cap as it is removed from the mandrel, both the mandrel 65
In order to completely form the threads on the inside
and cap being shown in section;
7
of side wall 13, in accordance with known procedures,
FIGURE 6 is a front view of the completed cap; and,
the mandrel 11 and the rollers 12 will be rotated relative
FIGURE 7 is a side sectional view of the cap of FIG
to each other about the axis of the mandrel.
For ex
URE 6, showing the gasket in place within the cap.
ample, in the illustration given, mandrel 11 remains sta
Looking ?rst at FIG. 1, the ‘cylindrical metal piece 70 tionary while head 23, upon which the rollers 12 are
from which the cap is to be formed is indicated in dotted
lines ‘and by the reference number 10. The mandrel 11
mounted, revolves about a central axis coinciding with
the axis of mandrel 11.
The rollers 12. are also free to
3,089,161
%
3
Through a
details have been set forth in the foregoing speci?cation,
hydraulic-mechanical mechanism (not shown) rollers 12
it will be apparent to those skilled in the art that the
method is not limited to the speci?c embodiment set fort
herein.
I claim:
1. The method ‘of forming an internally threaded cap
rotate about their own individual axes.
can be moved inwardly and outwardly with respect to
man-drel 11. During the forming operation, as will be
understood, the rollers 12 will be forced inwardly against
the mandrel as they rotate around the mandrel.
It has been found that the method produces best re
sults when the closed end 14 of the piece 10‘ is held in
?xed relation to the free end of mandrel 11 during the
from a cylindrical metal piece having smooth side walls
and one closed end, comprising positioning said metal
piece on a cylindrical mandrel having an outer free end
thread rolling operation. In the illustration given, this 10 portion providing a threaded band thereon, the crest diam
eter of said band being only slightly less than the internal
is accomplished by clamping end 14 against the end of
diameter of said piece, said positioning being such that
the mandrel. As shown more clearly in FIG. 4, a hold
the portion of said side walls adjacent the open end of
ing piece 24 provides a face which is shaped to engage
said piece is opposite ‘said band, holding said closed end
the outer face of the closed end 14 of piece 10. End
wall 14 can be clamped between the end face of holding 15 against movement toward said mandrel, applying continu
piece 24 and the free end of mandrel 11 in any suitable
(way. In the illustration given, the portion of the free
end of the mandrel which opposes the face of holding
piece 24 is provided by an axially-shiftable slide 25.
ous radial pressure by means of smooth faced rollers ‘at
circumferentially spaced locations on the outside of the
said portion of said side walls adjacent said open end,
simultaneously rotating said rollers relative to said side
Through a mechanical cam arrangement (not shown) 20 walls in such a direction as to effect tightening of the
piece on said mandrel and thereby swaging internal
threads in said side walls by forcing the said portion of
said side walls against said ‘band, the application of said
out of clamping engagement with the inner surface of
rollers beginning at an inwardly spaced distance from the
the wall 14 of piece 10. In FIG. 4, slide 25 is shown
in its outer position with the piece 10 clampingly en 25 closed end of said piece and said application reducing the
diameter of said piece around said threaded band while
gaged. In FIG. 5, the slide 25 is shown in its retracted
the portion of the side walls of said piece immediately ad
position. It will be understood that holding piece 24
actuated by a compressed air cylinder (indicated gen~
erally at 26 in FIG. 1) slide 25 can be moved into and
should be mounted within head 23 so that it can remain
stationary while head 23 rotates.
The construction of slide 25, and its method of ac
tuation is more completely described in my copending
application Serial No. 8,039, ?led February 11, 1960,
entitled, “Internal Thread Rolling Mandrel.”
jacent the closed end thereof maintains an internal diam
eter of at least slightly greater than the crest diameter of
said band, the exterior of the said portion of said walls
adjacent the open end of said piece remaining smooth
surfaced, releasing said radial pressure, and removing the
completed piece by rotating said piece on said mandrel in
such a direction as to effect unthreading ‘from said man
In order to maintain the relative positions of the man
drel 11 and the side walls 13 of the piece 10‘ during the 35 drel.
2. The method of forming an internally threaded cap
rolling operation, it is desirable to rotate rollers 12 around
from a cup-shaped metal piece having a cylindrical side
mandrel 11 in a direction causing piece 10‘ to tighten on
wall, a transversely extending end wall, and an open end,
mandrel v11 as the threads are formed. For example, if
comprising positioning said piece upon the free end por
the threads being formed are right-handed threads, rollers
tion of a cylindrical mandrel providing a threading band,
12 would rotate around mandrel 11 in a clockwise direc
said free end portion extending through the open end of
tion as viewed in a direction looking toward the free end
said piece and the portion of said side wall adjacent said
of the mandrel. In other words, during the thread form
open end being opposite said band, the crest diameter of
ing, the piece 10 would not resist the clamping engage
said band being only slightly less than the internal diam
ment whereby it is held against the end of mandrel 11, 45 eter of said side wall, holding the inside surface of said
but instead would tend to force itself even more ?rmly
closed end against movement toward said mandrel, apply
against the free end of the mandrel, much as if an already
ing continuous radial pressure against the outer surface of
threaded cap were being screwed onto the threaded por
the said portion of said piece opposite said threaded band
tion of the mandrel.
by means of rollers at a plurality of circumferentially
In FIG. 5, the piece 10 is shown being unscrewed from 50 spaced locations to reduce the diameter of said portion
the threaded portion of mandrel 11 after the cap has
opposite said band, said radial pressure being applied
been completely formed. Once the clamping engage
along lines parallel to the outer surface of said cap and
ment between the free end of mandrel 11 and the inside
extending from said open end up to a position spaced
of wall 14 has ben released, the completed ‘cap can read
from said closed end without applying said pressure to
ily be unscrewed.
55 the portion of said side wall immediately adjacent said
The completed cap C is illustrated in FIGS. 6 and 7.
closed end, simultaneously rotating said rollers relative to
As shown more clearly in FIG. 7, the cap is now provided
said piece in such a direction as to effect tightening of the
with internal threads 27 and with an annular groove 28,
piece on said mandrel and thereby swaging internal
which is adapted for receiving a gasket, such as gasket
threads in said side wall, releasing said radial pressure,
29. The annular groove 28 is adjacent the inside of end 60 and removing the completed piece by rotating said piece
wall 11-4, and the internal diameter of the threaded portion
on said mandrel in such a direction as to effect unthread
27 of the cap is substantially smaller than the internal
ing ‘from said mandrel.
diameter of the grooved portion 28. Consequently, the
3. The method of forming an internally threaded gas
gasket '29 once having been snapped into place, as can
ket-retaining cap from a cup-shaped metal piece having a
easily be done by using a resilient rubber gasket, will 65 cylindrical side wall, a transversely-extending end wall,
remain securely in place until it becomes so worn as to
and an open end, comprising positioning said piece upon
require replacing.
the free end portion of a cylindrical mandrel providing
As will be apparent to those skilled in the arts of metal
‘a threading band, said free end portion extending through
the open end of said piece and the portion of said side
forming, the method of this invention is applicable to
wall adjacent said open end being opposite said band,
caps formed of a variety of metals, such as steel, brass,
the crest diameter of said band being only slightly less
copper, ‘aluminum, etc. For forming grease gun caps, a
cold rolled steel is preferred, such as ‘cold rolled strip
than the internal diameter of said side wall, said posi
tioning being such that the portion of said side wall im
steel, aluminum killed, temper 5.
mediately adjacent said end wall extends outwardly be
While the method of this invention has been described
in relation to a speci?c preferred embodiment, and many 75 yond the outer end of said threading bands, holding the
3,089,161
5
6
inside surface of said closed end against movement to—
tightening of the piece on said mandrel and thereby swag
wards said mandrel, applying continuous radial pressure
ing internal threads in said side Wall, releasing said
against the outer surface of the said portion of said piece
radial pressure, and removing the completed piece by ro
tating said piece relative to said mandrel in such a direc
opposite said threading hand ‘by means of rollers at a
plurality of circumferentially spaced locations, said ra 5 tion as to effect unthreading from said mandrel.
dial pressure being applied along lines parallel to the outer
References Cited in the ?le of this patent
surface of said cap and extending from said open end out
to a position spaced from said closed end without apply
UNITED STATES PATENTS
ing said pressure to the portion of said side wall immedi
ately adjacent said closed end, simultaneously rotating said 10
rollers relative to said piece in such a direction as to effect
1,792,812,
2,647,553‘
Cameron _____________ __ Feb. 17, 1931
Shart _______________ __ Aug. 4, 1953
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