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Патент USA US3040438

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June 26, 1962
E. P. SUNl-DHOLM
3,040,428
METHOD OF FORMING AND MOUNTING A HANDLE
Filed May 29, 1959
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$49M Jain,
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Uited States Patent 0 " ice
3,040,428
Patented June 26, 1962
1
2
open-ended tube, as indicated in FIG. 3 by the number
13. It will be noted that the opposite edges 12a and 12b
of the sheet, as indicated in FIG. 2, have been brought
. 3,040,428
METHOD OF FORMING AND MOUNTING A
HANDLE
together to'provide a longitudinal joint 14 in the tube
‘Edwin P. Sundholm, Albert City, Iowa
Filed May 29, 1959, Ser. No. 816,793
2 Claims. (Cl. 29-475)
of FIG. 3. Along joint 14 the edges of the sheet are in
abutting relationship but are unconnected to each other.
It will also be noted that tube 13 as shown in FIG. 3
This invention relates to a method of forming and
provides a circular opening 15 which is located inter
mounting a handle. More particularly, the method re
mediate the end thereof and is intersected by the joint 14.
lates to a method‘ for providing a transverse handle or 10 This opening can be formed in any suitable manner, such
handgrip on the projecting end of a rod, for example, ,
as by drilling after the tube 13‘ has been formed. How
ever, it is preferred to follow the procedure illustrated
where it is desired to provide for the manual actuation
in FIG. 2 wherein the edges 12a and 121) are provided
of the rod. The method of this invention has particular
utility in connection with the manufacture of handles for
with complementary semi-circular indentations. or re
grease gun operating rods, such as the one illustrated in 15 cesses before the sheet is rolled to the tubular shape of
FIG. 3. When this is done, the opening i15 is auto
my prior Patent 2,43 6,701, issued February 24, 1948.
' matically formed when the edges 12a and 12b are brought
In the manufacture of grease guns it is necessary to
attach a handle or handgrip to the projecting end of the '
into abutting relationship.
I
Before the tube 113 is attached to the rod 10 to form
operating rod. ‘In the usual design of grease guns, the
operating rod extends through the rear cap into the barrel 20 the handle 11, it is preferred to go through the operation
of the gun, and means is provided for releasably inter
illustrated in FIG. 4. In this step, the extreme end por
tions of the tube 13 are turned inwardly under pressure
connecting the inner end of the rod with a plunger as
sembly within the barrel. ‘ In the‘operation of such grease
guns, it may be desirable to retract, advance, or rotate
to form an inwardly directed ?ange on each end thereof.
volve the application of considerable force to the rod, ‘1
and 17.
One simple procedure for accomplishing these results is
the plunger assembly by manually manipulating the pro 25 that illustrated in FIG. 4 wherein the tube 13 is com-,
pressed longitudinally between concave forming dies 16
jecting end portion of the operating rod,-and this may in
such as when a heavy spring must be compressed in with
drawing the plunger.
‘
‘
‘
The primary object of the present invention is to pro
FIG. 4 illustrates the appearance of the tube
after the completion of the die forming operation wherein
the extreme end portions of the tube are turned inwardly.
30. Due to the pressure applied in this forming operation
there is a cold ?ow of metal adjacent the outer ends of
the joint 14 which results in overlapping of metal at the
projecting end of a rod which is adapted for use in the
end portions of the unconnected edges along the in
manufacture of grease guns, and which provides the ad
vantage of substantially reduced manufacturing costs as
wardly directed ?anges.
compared with prior methods while at the same time 35 Following the step illustrated in FIG. 4, or directly
vide a method of forming andv mounting a handle‘ on the p I
providing a rugged and durable handle. Further objects '
following the step illustrated in FIG. 3 if desired, the
and advantages will appear as the speci?cation proceeds.
The present invention is illustrated in the accompany
metal rod to which the handle is to be attached, such
as rod 10, is extended through the opening 15 into con
tact with a portion of the inner wall of the tube opposite
the opening, as illustrated in FIG. 5. The rod 10 should
be formed of, a metal which is fusible with the metal
of the tube 13. Also, it is desirable to have the rod
ing drawing, in which-—
'
~
FIGURE 1 is a perspective view of a handle which
has been formed and mounted in accordance with the
present invention;
‘
FIG. 2, a plan view of a ?at metal sheet from which
of only very slightly smaller diameter than the minimum
the handle of FIG. 1 can be formed;
FIG. 3, a perspective view of the handle after the sheet
diameter of the opening 15 so that the rod will be snugly
received within the opening. According to the method
of FIG. 2 has been rolled into a tubular shape;
FIG. 4, a side sectional view showing the tube of FIG.
3 being compressed between forming dies in one of they
of this invention, it is not necessary to have the end of
rod 10‘ rounded to conform to the internal curvature of
tube ‘13. Good results are obtained even though the
manufacturing steps;
end of the rod is squared off, and is thereby prevented
FIG. 5, a side’ sectional view showing the tube of 50 from‘ forming a' full surface to surface contact with the
inner wall of tube :13. One satisfactory relationship of
FIG. 3 applied to the end of an actuating rod as it would
appear during another of the manufacturing steps;
these parts before fusing is shown in FIG. 5
FIG. 6, a view similar to FIG. 5 illustrating a further
In the next step of" the method, the end of the rod
manufacturing step and also the way in which the han
10 is fused to the inner wall portion of the tube 13 to
dle is interconnected to the rod in the ?nal product; and
form a secure bond therebetween. These members are
preferably united by heating the end of the rod and the
FIG. 7, a View identical to FIG. 5 except the end of
wall portion to a fusing temperature while applying
the handle has a modi?ed shape.
pressureto force the rod and wall portion into engage
As already indicated, this invention is concerned with
ment. Such an" operation is illustrated diagrammatically
the method of forming and mounting a handle on the end
of a rod, the external appearance of the ?nal product 60. in FIG. 6. An electrode 18 having a concave face is
being shown in FIG. 1 where the rod is designated by
applied to theoutside of tube 13 over the wall portion
the number 10 and the transverse handle by the number
of the tube which is to be fused to the end of rod 10.
11. The procedure for making this handle will now be
While heat is being applied by means of the electrode,
described in detail.
7
I
pressure is applied to rod 10, as indicated by the arrow
In accordance withthe present invention, the starting 65 in FIG. 6, to force the rod into engagement with the
material for forming the handles is metal sheet stock.
wall of the tube. The appearance of the parts after the
I The method is applicable to any malleable metals, such
completion of this pressure fusion operation is shown in
as low carbon steels, aluminum, etc.
FIG. 6.
,
.
In FIG. 2 there is shown a rectilinear piece of metal
Following
the
completion
of
the
steps
just
described,
70
sheet stock which has been cut to the size for forming
the handle is ready for use. As previously indicated,
a single handle, the ?at sheet being designated by the
FIG. 1 illustrates the external appearance of the ?nal
number v12. The sheet 12 is rolled into the shape of an
3,040,428
41
product, the handle 11 being provided by the tube 13
which has been formed by the procedure previously de
said inner wall portion to form a secure bond there
between.
2. In a method of forming and mounting a handle,
scribed and united to the end of rod 10.
FIGURE 7 illustrates a modi?cation of the attach~
ment method which can be used if desired. As there
shown, the rod 10' is scarfed or ground at 10’a and 10’B
to provide the end with a taper which is is to be attached
the steps comprising providing a ?at rectangular sheet
of malleable metal with corresponding opposed semi
circular recesses in the longitudinal edges of said sheet,
to tube 13', thereby permitting a larger surface to initially
tube with longitudinal, unconnected, abutting edges,
engage the inside of tube 13'.
said opposed recesses and said longitudinal 'edges de
This will facilitate the
rolling said ?at sheet into the shape of an open-ended
welding operation and avoid burning of the rod.
10 ?ning a circular opening intermediate the ends of said
While the method of this invention has been described
tube, turning the extreme end portions of said tube in
in relation to a preferred embodiment ‘thereof for pur
wardly under pressure to form an inwardly directed ?ange
on each end thereof, said pressure causing cold ?ow
poses of illustration, it will be apparent to those skilled
in the art that the method is susceptible to other embodi
and overlapping of metal at the end portions of said
ments than the one set forth herein and that certain of 15 unconnected edges, extending the end portion of a metal
rod through said circular opening to bring the end of
the details hereinbefore set forth can be omitted or
varied without departing from the basic principles of the
said rod into contact with a portion of the inner wall
of said tube opposite said opening, said rod having ap
invention.
proximately the same diameter as said opening so as to
I claim:
be snugly received therein, and uniting the said end of
1. In a method of forming and mounting a handle,
said rod to said tube wall portion by applying heat and
the steps comprising providing a ?at rectangular sheet
pressure thereto.
of malleable metal with corresponding opposed semi
circular recesses in the longitudinal edges of said sheet,
References Cited in the ?le of this patent
rolling said flat sheet into the shape of an open-ended
tube with longitudinal, unconnected, abutting edges, said 25
UNITED STATES PATENTS
opposed recesses and said longitudinal edges de?ning a
1,405,04a
Kraft _______________ __ Jan. 31, 1922
circular opening intermediate the ends of said tube, turn
2,109,470
Dake ________________ .._ Mar. 1, 1938
ing the extreme end portions of said tube inwardly un
der pressure to form an inwardly directed ?ange on each
end thereof, said pressure causing cold flow and over
lapping of metal at the end portions of said unconnected
' edges, extending the end portion of a metal rod through
said circular opening to bring the end of said rod into
2,120,150
2,126,473
2,162,088
2,179,089
2,883,738
1938
1938
1939
1939
1959
FOREIGN PATENTS
contact with a portion of the inner wall of said tube op
posite said opening, and fusing the end of said rod to 35
Marshall _____________ .._ June 7,
Keller _______________ __ Aug. 9,
Jonas _______________ __ June 13,
Hauf ________________ __ Nov. 7,
Morrow _____________ __ Apr. 28,
11,696
Great Britain _______________ __ 1904
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