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Патент USA US3059829

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Oct- 23, 1962
Filed Jan. 8, 1959
kW“! 32
2 Sheets-Sheet 1
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; Bram‘; £4411, £4444 m’ifw
Oct- 23, 1962
Filed Jan. 8, 1959
2 Sheets-Sheet 2
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United States Patent Office
Patented Get. 23, 1952
FIGURE 1 is a side sectional view of a grease gun em
bodying the present invention;
Edwin P. Sundhohn, Albert City, Iowa
Filed Jan. 8, 1959, der. No. 785,689
3 Claims. (ill. 222-326)
This invention relates to an optional loading grease
gun, that is, a grease gun which is adapted for use selec
tively with both cartridge-packaged greases and bulk-?lled
greases, including both the pressure and suction ?lling of
bulk greases.
The use of cartridge-packaged greases in connection
with grease guns has increased rapidly in recent years, and
guns have been provided for utilizing the grease in the
FIGURE 2 is an enlarged fragmentary side sectional
view showing the rear end portion of the grease gun cyl
inder or barrel of FIGURE 1;
FIGURE 3, an enlarged detail fragmentary side eleva
tional view illustrating the relationship of the plunger to
the grease gun barrel or cylinder when the gun is being
used with bulk-?lled greases;
FIGURE 4, a sectional plan view taken on line 4-4
of FIGURE 3 and showing the rear side of the plunger;
FIGURE 5, an enlarged sectional view of the plunger
taken on line 5——5 of FIGURE 4;
FIGURE 6 an enlarged fragmentary side sectional view
cartridge-packaged form. Such grease guns, however, 15 of the grease gun of FIGURE 1 showing the rearward
have suffered from the disadvantage that they could not
portion of the grease gun with the plunger fully with
also be used with bulk greases. An effort has therefore
drawn and locked in the withdrawn position;
been made to provide an optional loading grease gun
FIGURE 7, a transverse sectional view showing the
which is adapted for use with both cartridge-packaged
rear end of the closure cap and taken on line 7—7 of
greases and bulk-?lled greases. Heretofore, this effort 20 FIGURE 6;
has only been partially successful, and the problems pre
FIGURE 8 another transverse sectional view taken on
sented have not been completely solved.
line 8—8 of FIGURE 6 showing the relationship of the
The problem discussed above is rendered particularly
parts when the plunger is fully withdrawn;
di?icult because of the fact that bulk greases are com
monly introduced into grease guns in a variety of ways.
The grease may be loaded by pumping it into the barrel
of the grease gun, or the grease may be sucked into the
FIGURE 9 a view showing the forward face of the
plunger taken on line 9-9 of FIGURE 6; and
FIGURE 10 a fragmentary enlarged side sectional view
of the grease gun of FIGURE 1 showing the forward end
portion of the grease gun, the section being taken on a
barrel. In One procedure in common use, the dispensing
head is removed from the grease gun and the forward end
plane turned 90 degrees with respect to the plane of the
of the barrel is inserted in an open pail of grease. The 30 section of FIGURE 1.
plunger is then slowly withdrawn within the barrel to suck
Referring now more speci?cally to the embodiment
the grease into the gun. In another procedure, the grease
shown in the drawings, it can be seen that the grease gun
is sucked into the barrel through an opening in the dis
includes a cylindrical grease container 10, a closure cap
pensing head from a special container which is con
11 threadedly connected to the rear of the container, and
structed so that a tight connection can be made between 35
a grease dispensing head 12 removably mounted on the
the interior of the grease gun and the interior of the con
front end of the container. Within container 10 is a
tainer. In connection with the pressure ?lling method, it
slidable plunger assembly 13 which is designed, as will
is common to use gun-?lling pumps which deliver the
be explained in greater detail, to create suc
grease under pressure, the grease being introduced through
a valve-controlled opening in the dispensing head.
viously, therefore it is a difficult problem to provide a
grease gun which is adapted for use with cartridge-pack
aged greases and which can also be loaded by any of the
tion within container 10 when withdrawn or to urge grease
towards dispensing head 12 when used with either bulk
?lled greases or cartridge-packaged greases. As shown in
FIG. 1, a grease cartridge 14 is positioned within cylinder
10, the cartridge being partially ?lled with grease 15. Be
hind plunger assembly 13 is provided a compound spring
16, the construction of which will also be further dis
cussed in detail. A plunger rod 17 is provided for the
manual actuation of plunger assembly 13, the rod being
releasably engageable with the plunger assembly for re
designed so as to create su?icient suction on the back
tractin g, and rotating the assembly.
stroke for drawing grease into the gun, it tends to 0p 50
In accordance with the present invention, the plunger
erate less effectively in the dispensing operation. If the
assembly 13 provides an annular portion 18‘ which is
piston is backed with a spring for urging the piston to
adapted for sealing selectively with the inner wall of a
wards the dispensing head, as is usually desirable, this
grease cartridge 14 positioned within container 10 or
may tend to cause the suction-type plunger to move in
wardly without keeping all of the grease ahead of it. A 55 with the inner wall of the container 10‘. It will be noted
that the plunger portion 18 provides a pair of annular
similar problem is encountered when it is attempted to
blades 18a and 18b‘ one of which extends outwardly and
?ll such grease guns by pumping grease into them. The
rearwardly and the other of which extends outwardly and
grease which is introduced under pressure tends to force
forwardly, as shown more clearly in FIGURE 5. The
its way past the piston, particularly if the piston is backed
with a string, and the presence of grease in the portions 60 plunger portion 18, which provides the blades 18a and 1812,
pressure-?lling or suction-?lling procedures just described.
Even if the gun was to be designed only for the use of
bulk-?lled greases, the problem is a difficult one where it
is desired to be able to load the gun by both pressure and
suction methods. When the plunger of the grease gun is
should be formed of a resilient, ?exible material such as
a synthetic rubber. It Will be understood that the ma
terial should be resistant to deterioration on prolonged
of the gun behind the piston can create unpleasant di?i
culties for the operators of the guns.
It is therefore an object of the present invention to pro
vide a grease gun which substantially overcomes the prob
lems discussed above. A more speci?c object is to pro
vide a grease gun which not only can be ?lled by any of
contact with grease. In the illustration given, plunger
portion 18 is integrally connected to a transversely-ex
tending base portion 19 which provides a central rear
the suction or pressure methods in common use, but which
wardly-extending hub portion 20 that is slidably received
is also adapted for use with cartridge-packaged greases.
Further objects and advantages will appear as the speci?
on plunger rod 17, while maintaining a sealing engage
ment therewith. With the construction shown, the an
cation proceeds.
An illustrative embodiment of the present invention is
shown in the accompanying drawings, in which—
70 nular portion 18 and the integral base portion 19 can be
conveniently formed by a molding operation. In the il
lustration given, the base portion 19 is locked between
clamping washers 21 and 22. The washers 21 and 22
provide a plurality of complementary depressions 21a
is provided a shoulder or abutment 3741’. This con?gura
tion can be achieved by a rolling operation wherein a cor
respondingly shaped mandrel is inserted in the container
and 22a which extend through openings in the transverse
and rollers are applied to the outside of the container to
base portion 19 and bear against each other. These
projections may be united by spot welding as indicated in CH form the wall portion 37 against the mandrel.
In the operation of the device, the forward section 37a
FIGURE 6. The rear washer 21 also provides projec
will depress the blades 18a and 181) as the plunger assem
tions 2112, as shown more clearly in FIGS. 5 and 8, which
bly is withdrawn, permitting the blades to ride through the
interlock with projections on base portion 19. The outer
intermediate section 37b and over the shoulder 370! to
edge portions 210 and 220 of the washers are turned to
19 the position shown in FIGURE 6. With the plunger as
ward each other to provide a further interlock.
sembly locked in this position by means previously de
The lower end of plunger rod 17 is provided with an
scribed, a grease cartridge having an open rear end is
outwardly extending pin 23. In the operation of the de
inserted within the cylinder 19 through the front end there
vice, pin 23 may be drawn into one of the slots 24 be
of, the dispensing head 12 having been previously re
tween tabs 22b by means of the handle 25 on the rear
moved. When the. grease cartridge is fully inserted it will
end of plunger rod 17. The plunger assembly can then
occupy the position shown in FIGURE 1 with the rear
be rotated or retracted as desired.
ward end of the cartridge received within the section 37 b,
The sleeve 26 encircles plunger rod 17, and has its
which due to its concentricity with the body of cylinder
forward end abutting rear washer 21 around hub 28. As
10 assists in holding the grease cartridge, such as grease
indicated more clearly in FIGURE 8, the forward end of
cartridge 14, in centered relation within the cylinder 18.
sleeve 26 is provided with a plurality of outwardly extend
ing attachment tabs 27 which are spot Welded to rear
It will also be observed that the rear edge of the grease
cartridge 14 lies just in front of the shoulder 37d, the
shoulder at least partially overhanging the rear edge of the
cartridge to prevent the forward blade 1812 from catching
to provide complementary bearing surfaces around plunger 25 on the rear edge of the cartridge as the plunger assembly
13 is inserted into the cartridge. The insertion can then
rod 17, thereby assisting in maintaining plunger assembly
be accomplished by simply releasing the plunger assembly
13 at right angles to plunger 17 regardless of the position
13 and allowing the spring 16 to move the plunger as
of the plunger assembly or the plunger rod within the
sembly forwardly. Forwardly converging section 37 0 will
grease gun. The rear end of sleeve 25 provides a pair of
washer 22. The intermediate portion of sleeve 25 is pro
vided with integral inwardly-extending tabs 28 and 29, as
seen more clearly in FIGURES 6 and 8, which cooperate
arcuate cars 30 and 31. The rear wall of end cap 11 pro 30 depress the blade 18]) so that it will ride over shoulder 37d
smoothly and into the open upper end of the grease car
vides a pair of arcuate slots 32 and 33 which are align
tridge, and a similar action will then follow with respect
able with ears 30 and 31 and are arranged to cooperate
to the rearward blade 18a. The position of the plunger as
therewith. The ears are undercut as indicated at 34
sembly 13 within the grease cartridge is illustrated in FIG
(FIGURE 6) for interlocking with raised areas 35 which
lie adjacent the ends of slots 32 and 33. Plunger assem 35 URE l where the cartridge is shown partially ?lled with
grease, as it would appear during the use of the gun when
bly 13 may be drawn rearwardly until the ears 30 and 31
of the grease has been dispensed.
extend respectively through slots 32 and 33, and then the
plunger assembly can be slightly rotated so that the ears
rest on raised areas 35 thereby releasably locking the
plunger assembly in the withdrawn position. The plung
er can be released by forceably rotating the ears 3%] and
31 in the opposite direction to bring them into alignment
with the slots 32 and 33.
In accordance with the present invention, container 18
toward the rear thereof is formed inwardly to provide
means for contracting the blades 18a and 18b of plunger
annular portion 18. Preferably, the inwardly formed
portion of container 10‘ also provides means for holding
The construction and operation of dispensing head 12
is described more particularly in my copending applica
tion Serial No. 669,115, ?led July 1, 1957, now Patent No.
2,923,443. For the purpose of this application it is be
lieved su?icient to note that the dispensing head 12 in
cludes a body 38 having a bore 39 therein for slidably re
ceiving piston plunger 40 that extends outwardly beyond
body 38 and is pivotally connected to an operating handle
41. The forward end of operating arm 41 is pivotally
connected to a pair of links 42 (FIGURE 10), which in
turn are pivotally mounted on body 38, thereby permitting
piston 40 to be reciprocated by the corresponding recip
the upper end of a grease cartridge in centered relation 50 rocation of arm 41. The bore 49 communicates with an
within the container. As shown in FIGURES 1, 2 and 6,
an inwardly-extending annular wall portion 37 is provided
toward the rear of container 10. Annular wall portion 37
is arranged to depress blades 18a and 18b inwardly to re
duce the diameter of the plunger assembly for insertion
into the open end of a grease cartridge. More speci?cally,
plunger assembly 13 can be drawn into and through an
inlet opening 43 ‘which extends through ‘cap 44 and the ad
jacent wall of body 38 to provide for communication be
tween bore 39 and the interior of container 10 when the
piston rod 40 is withdrawn sufficiently to uncover inlet
opening 43. ‘Body 38 also provides an opening 45 com
municating with the end of bore 39 towards which piston
rod 40 advances. A grease discharge ?tting 46 is
nular container portion 37, thereby reducing the diameter
thrcadedly received within an enlarged outer portion of
of the contractable plunger portion by depressing blades
opening 45 and provides a passage 47 therethrough for
18a and 18b inwardly. FIGURE 6 shows the position 60 the out?ow of grease from within bore 39‘. Fitting 47
of the plunger assembly when fully withdrawn and ready
provides a spring biased check valve 48 which is arranged
for insertion into the open end of a grease cartridge.
to permit out?ow only through passage 45. As shown in
The cartridge is not shown in FIGURE 6, but it would
FIGURE 1, the outer end of ?tting 46 is adapted to re
occupy the position indicated in FIGURE 1.
ceive a grease applicator pipe 49. As shown in FIGURE
The particular shape of inwardly extending portion 37
10, the cap 44, which is threadedly connected to the
as shown in the drawings has a number of advantages.
front end of container 10, also provides an inlet opening
However, other shapes can be used while still obtaining
50. In the illustration given, opening 50 is internally
certain of the bene?ts of the present invention. As shown
threaded to receive a ?ller ?tting 51 and thereby mount
more clearly in FIGURES 2 and 6, container portion 37 is
the same on the outside of head 12 to provide a passage
composed of a forward section 37:11 which provides an in 70 52 extending from the outside to ‘the inside of container
10. Preferably, ?tting 51 includes a sp'ringebiased check
wardly converging wall, an intermediate section 37b
valve 53 arranged to permit only in?ow through passage
which provides a wall concentric with the body of con
52. It will be noted that the outer portion of ?tting 51
tainer 10 but spaced inwardly therefrom, and a rearward
which encloses valve 53 is removable from the inner por
section 370 which provides a forwardly converging wall.
At the inner end of the forwardly converging section 370 75 tion, being threadedly connected thereto at 54. With this
construction, grease can be pumped into container 10
wardly, the integral wall of said container toward the
through ?tting 51. When it is desired to suck grease into
rear of said container being formed inwardly from the ex
container 10, this can be done by removing the outer
terior thereof and providing an integral annular wall por
portion of ?tting 51 which includes valve 53, and con
tion of greater inward extent than the wall of said con
necting the remaining portion of ?tting 51 to the con
tainer extending forwardly therefrom, said annular wall
tainer from ‘which the grease is to be obtained. Alterna
portion having at least a forward section and a rearward
tively, dispensing head 12 can be removed, and the for
section, said forward section providing an inwardly con
ward end of container 10 can be applied directly to the
verging surface merging smoothly at its forward end with
grease. In either case, the plunger assembly ‘13 will be
the inside surface of said container wall, means for re
in its forwardmost position within the container 16) at 10 tracting said plunger assembly into the rearward portion
the start of the ?lling operation, and will be slowly drawn
of said container, said plunger assembly being retractable
rearwardly to create the suction within the container for
to a position where both of said annular blades are lo
drawing in the grease. The plunger assembly may also
cated rearwardly of the said forward section of said annu
be in its forwardmost position when grease is being
lar wall portion and adjacent the said rearward section
pumped into the container since the grease will force the
thereof, said blades being depressable inwardly by engage
plunger assembly rearwardly until the container is ?lled
ment with said forward section ‘to reduce the diameter of
with grease.
It is preferred to provide spring means for urging the
plunger assembly toward the forward end of the gun, and
the speci?c spring means illustrated in the drawings has
a number of advantages. The use of a compound spring,
such as spring 16 permits the entire spring to be with
drawn within the rear cap 11 when the plunger assembly
is in its rearwardmost position, as indicated in FIGURE
6, while still providing su?icient spring action during the
last portion of the forward movement of the plunger as
In the illustration given, the spring means 16 includes
two coil spring sections 16a and 1612. Section 1612 is of
smaller diameter than section 16a and is arranged to tele
scope within section 16a. The forward end portion of
section 16a and the rearward end portion of section 16b
are interconnected in overlapping relationship by means
of a sleeve 160 as shown more clearly in FIGURES 6 and
The forward end of section 16b bears against rear
washer 21 of plunger assembly 13, and the rearward end
of section 16a bears against the inside of the rear wall of
cap 11. The projections 21b of rear washer 21 assist in
centering the forward end of spring section 16b.
While in the foregoing speci?cation the various fea~
tures of the present invention have been described with
relation to a speci?c embodiment thereof, as shown in the
grease gun of the accompanying drawing, it will be ap
parent to those skilled in the art that the features of the
present invention are adapted for use in grease guns which
differ in construction from the one shown in the drawing.
I claim:
1. In a grease gun adapted for use selectively with car~
tridge-packaged greases and for both pressure and suction
?lling of bulk greases, said grease gun being of the kind
having a cylindrical grease container with an integral
wall, a closure cap removably mounted on the rear of
said container, a grease dispensing head removably
mounted on the front of said container, and a slidable
plunger assembly within said container, the combination
comprising a pair of annular blades of resilient, ?exible
material provided by said plunger assembly for sealingly
engaging the inner wall of said grease container, one of
said annular blades extending outwardly and rearwardly
and the other of said blades extending outwardly and for 60
said plunger and being held in said depressed condition by
said rearward section, and means for releasably locking
said plunger assembly in said retracted position, whereby
upon withdrawal behind the forward section of said annu
lar wall portion said blades can be inserted in the open
rear end of a grease cartridge.
2. The combination of claim 1 wherein said annular
Wall portion also has an intermediate section providing an
inner surface concentric with the inner surface of the for
wardly extending portion of said container wall but spaced
inwardly therefrom for holding the upper end of a grease
cartridge in centered relation within said container, said
intermediate section being located between said forward
section and said rearward section.
3. The combination of claim 1 wherein said annular
wall portion of said container also has an intermediate
section providing an inner surface concentric with the
inner surface of the forwardly-extending portion of said
container wall but spaced therefrom for holding the upper
end of a grease cartridge in centered relation within said
container, ‘said intermediate section being located be
tween said forward section and said rearward section,
and wherein said annular wall portion also provides an
inwardly-projecting annular abutment located at the rear
ward end of said inner concentric surface in front of said
rearward section for engaging the rear edge of a grease
References Cited in the ?le of this patent
Hanson _____________ __ Dec. 22,
Heinitsh et al. ________ __ Oct. 30,
Sargent ______________ __ Feb. 19,
Kellogg _____________ __ Sept. 24,
De Quincy et al ________ __ Apr. 19,
Krannak ____________ .._ Sept. 26,
Klein ________________ __ Oct. 24,
Campbell et a1 _________ __ Sept. 30,
Bryant ______________ .._ Apr. 21,
Deupree ____________ __ Aug. 21,
Deupree ____________ .._ May 21,
Klein et al. __________ __ May 12,
Sundholm ____________ __ Dec. 1, 1959
Jernander ___________ __ June 21, 1960
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