NZ711395B - Grease gun - Google Patents
Grease gunInfo
- Publication number
- NZ711395B NZ711395B NZ711395A NZ71139515A NZ711395B NZ 711395 B NZ711395 B NZ 711395B NZ 711395 A NZ711395 A NZ 711395A NZ 71139515 A NZ71139515 A NZ 71139515A NZ 711395 B NZ711395 B NZ 711395B
- Authority
- NZ
- New Zealand
- Prior art keywords
- cartridge
- grease gun
- press head
- piston
- barrel
- Prior art date
Links
- 239000004519 grease Substances 0.000 title claims abstract description 62
- 238000007789 sealing Methods 0.000 claims description 9
- 230000001154 acute Effects 0.000 claims description 3
- 230000002093 peripheral Effects 0.000 description 7
- 230000000875 corresponding Effects 0.000 description 3
- 210000001138 Tears Anatomy 0.000 description 1
- 230000001070 adhesive Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001010 compromised Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003313 weakening Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N3/00—Devices for supplying lubricant by manual action
- F16N3/10—Devices for supplying lubricant by manual action delivering grease
- F16N3/12—Grease guns
Abstract
grease gun having a press head (12), a barrel (14) detachably coupled to the press head, a connector (26) formed at the press head for connecting a cartridge (18) that is accommodated in the barrel (14), and a support (28) for supporting the cartridge (14), the support being formed at the barrel in a rear end portion facing away from the press head (12), wherein a spring (30) which biases the cartridge against the press head (12) is provided between the support (28) and the rear end of the cartridge (18). (Fig. 7) n a rear end portion facing away from the press head (12), wherein a spring (30) which biases the cartridge against the press head (12) is provided between the support (28) and the rear end of the cartridge (18). (Fig. 7)
Description
GREASE GUN
This application claims priority from European application number 14 184 528.9 filed on
12 September 2014 and from German application number 20 2015 102 298.0 filed on
5 May 2015, the contents of which are to be taken as incorporated herein by this reference.
TECHNICAL FIELD
The invention relates to a grease gun having a press head, a barrel detachably coupled to the
press head, a connector formed at the press head for connecting a cartridge that is
accommodated in the barrel, and a support for supporting the cartridge, the support being
formed at the barrel in a rear end portion facing away from the press head.
BACKGROUND
A handlebar-type grease gun of this type is known to the Applicant. The press head of the
handlebar-type grease gun includes a self-priming high pressure piston pump the piston of
which is connected to the handlebar such that grease is squeezed out through a discharge
opening under high pressure when the handlebar is pivoted against the barrel. During a return
stroke of the piston, when the handlebar is pivoted away from the barrel, new grease is
sucked-in from the cartridge. The cartridge has a tubular casing that is open at its rear end and
in which there is guided a follow-up piston which encloses the grease in the cartridge and
slides towards the press head due to the suction pressure created by the press head as the
cartridge is increasingly being emptied. At its rear portion, the barrel forms a support in the
form of a crimp which is abutted directly by the cartridge. The position of the support has been
selected such that it holds the cartridge in a position in which it sealingly engages the press
head.
A grease gun in which the cartridge has a neck portion that faces the connector and is
surrounded by a shoulder of the cartridge is also known to the Applicant, whereby an output
opening of the cartridge is defined by the neck portion which is sealingly received in the
connector of the press head.
It would be desirable to provide a more versatile grease gun.
SPEC-NZ19734-15
SUMMARY OF THE INVENTION
According to the present invention there is provided a grease gun having a self-priming press
head, a barrel detachably coupled to the press head, a cartridge that is accommodated in the
barrel, a connector formed at the press head for connecting the cartridge, a support for
supporting the cartridge, the support being formed at the barrel in a rear end portion facing
away from the press head, a follow-up piston that is slidable in the cartridge, and a spring
which biases the cartridge against the press head is provided between the support and a rear
end of the cartridge, and wherein the press head has an annular sealing surface at which an
open front end of the cartridge is held in abutment by the spring.
This has the advantage that it is possible to use cartridges of different lengths, while it is still
assured that the cartridge engages the press head.
In an advantageous embodiment, the grease gun has a piston rod and an integrated follow-up
piston, so that the grease gun may also be used without cartridge. In one embodiment, the
piston rod is detachable, so that it does not interfere with the cartridge when a cartridge is
being used. In another embodiment, the piston rod has an acute tip, so that the piston rod may
pierce the follow-up piston of the cartridge. In this case, the follow-up piston of the cartridge
may be pierced and may then be slid along the piston rod even when the follow-up piston of
the cartridge does not have a pre-perforated brake point.
In one embodiment, the connector comprises an annular collar which surrounds a neck portion
of the cartridge but is radially spaced therefrom and sealingly engages a shoulder of the
cartridge. In this embodiment, the cartridge may be coupled gas-tightly to the press head, so
that a suction pressure for sucking-in the grease may be created, even when the neck portion of
the cartridge does not form a smooth sealing surface.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiment examples will now be described in conjunction with the drawings, wherein:
Fig. 1 is a view of a grease gun according to the invention;
Fig. 2 is a view of the grease gun of Fig. 1 in a modified configuration;
<filename>
Fig. 3 is an enlarged axial sectional view of a press head of the grease gun in the
configuration shown in Fig. 1;
Fig. 4 is a sectional view analogous to Fig. 3, but for the configuration according to
Fig. 2;
Fig. 5 is a view of a grease gun according to a modified embodiment;
Fig. 6 is an enlarged axial sectional view of the press head of the grease gun shown in
Fig. 5;
Fig. 7 is a view of a grease gun according to another embodiment of the invention,
with a cartridge received therein;
Fig. 8 is an enlarged axial sectional view of the press head of the grease gun shown in
Fig. 6; and
Fig. 9 is a sectional view analogous to Fig. 7, illustrating the use of the grease gun
with a cartridge having a different design.
DETAILED DESCRIPTION
The grease gun 10 shown in Fig. 1 has a press head 12 to which a detachable barrel 14 has
been coupled, e.g. by means of a screw-thread 16. The barrel 14 accommodates a cartridge 18
that contains a certain supply of grease.
As is generally known in the art, the press head 12 includes a self-priming high pressure piston
pump 20 (Fig. 3) which is operated by means of a handlebar 22. When the handlebar 22 is
pivoted from the position shown in Fig. 1 in the direction away from the barrel 14, grease is
sucked-in from the cartridge 18, and when the handlebar is then pivoted again in the direction
approaching the barrel, the grease that has been sucked-in is squeezed out under high pressure
through an outlet opening 24 of the grease gun.
SPEC-NZ19734-15
The cartridge 18 has a tubular plastic casing that is open at both its front and rear ends and
sealingly engages, with its front end, a plane sealing surface of a connector 26 formed at the
press head 12.
The barrel 14 has, in the vicinity of its rear end, a peripheral crimp that forms a support 28 for
a spring 30, in this example a helical compression spring that has been machined to have
plane-parallel end faces. The spring 30 abuts the support 28 and engages the internal
peripheral surface of the barrel 14 almost without play. Its front end presses upon the open rear
end of the cartridge 18 so that the front end of the cartridge is biased with a certain force
against the sealing surface of the connector 26 and thereby sealingly engages this surface so as
to establish a tight connection between the interior of the cartridge and the piston pump 20.
When the cartridge 18 is to be replaced, the barrel 14 is screwed off from the press head 12.
The cartridge 18 may then simply be withdrawn and be replaced by a new cartridge filled with
grease. When the barrel 18 is then thrust over the cartridge and is tightened, a tight connection
between the cartridge and the piston pump 20 is automatically re-established, even when the
length of the new cartridge is different from the length of the previous cartridge. In this way,
the grease gun according to the invention may be utilized with cartridges of different brands.
In the example shown, the cartridge 18 has a follow-up piston 32 that is formed by a plastic
disk and is guided for sliding movement in the tubular part of the cartridge 18. A known type
of cartridges is closed by a detachable lid at the front end and has at the rear end a multi-
purpose lid which is secured at the casing with a peripheral pull-off fastening tape. When the
fastening tape has been pulled off, the multi-purpose lid may be utilized as follow-up piston
When the front lid has been removed, the supply of grease in the cartridge fills essentially the
entire space between the connector 26 and the follow-up piston 32. When grease is sucked out
of the cartridge 18 by the action of the self-priming piston pump,
SPEC-NZ19734-15
the atmospheric pressure acting upon the outward side of the follow-up piston 32 causes the
same to move towards the press head.
Fig. 1 further illustrates an integrated follow-up piston which permits a different way of
utilizing the grease gun 10, as will now be explained in conjunction with Fig. 2.
In Fig. 2, the grease gun is used without cartridge 18. The integrated follow-up piston 34 is
detachably mounted to an end of a piston rod 36 which passes coaxially through the interior of
the barrel 14 and is slideably guided in an end cap 38 at the rear end of the barrel. A
detachable handle 40 has been screwed onto the end of the piston rod 36 outside of the barrel
In order to fill the grease gun with grease in the configuration shown in Fig. 2, the barrel 14 is
screwed off from the press head 12, the follow-up piston 34 is withdrawn into the rear end
position by means of the handle 40, and grease is filled into the barrel 14, for example in a tear
open package. Subsequently, the press head 12 is screwed-on again, so that the grease may be
sucked-in by the piston pump 20. A helical spring (not shown) which slightly biases the
follow-up piston 34 towards the press head 12 may be provided in the space between the end
cap 38 and the follow-up piston 34, so that the follow-up movement of the piston is assisted
when the grease gun is being emptied.
The integrated follow-up piston 34 has an elastic seal the outer diameter of which is
adjustable, as will be explained later. In this way, the follow-up piston 34 may be adjusted
such that it may optionally fit into the barrel 14 (Fig. 2) or may fit into and be slideable in the
cartridge 18 (Fig. 1).
In Fig. 3, the press head 12 and the adjacent end of the barrel 14 have been shown in an
enlarged axial sectional view. What has been shown here is the configuration according
to Fig. 1 with the cartridge 18 inserted, specifically a condition in which the cartridge
has been emptied completely and, consequently, the follow-up piston 32 of the cartridge
SPEC-NZ19734-15
as well as the integrated follow-up piston 34 of the grease gun are located at the front end of
the cartridge.
As can be seen in Fig. 3, the connector 26 has a cylindrical recess 26' inside of the annular
sealing surface. A bore 42 connects the recess 26' to a cylinder 44 in which a piston 46 of the
high-pressure piston pump 20 is slideable. When the piston 46 moves to the right in Fig. 3,
grease is sucked-in via the bore 42 and the recess 26'. When the piston moves to the left
beyond the position of the bore 42, the grease enclosed in the cylinder 44 is squeezed out
under high pressure via the outlet opening 24 and a check valve 48.
The integrated follow-up piston 34 has a peripheral elastic squeeze seal 50 held between two
disks 52, 54. The disk 54 is slideable in axial direction on a bolt 56 that projects from the disk
52 and, in Fig. 3, the disk 54 engages a collar 58 of this bolt, so that a maximal spacing exists
between the disks 52 and 54 and the squeeze seal 50 is compressed only slightly and has a
correspondingly small outer diameter, so that the follow-up piston 34 can easily be moved
inside the cartridge 18.
In the portion projecting beyond the collar 58, the bolt 56 forms a threaded portion 60 with
smaller diameter which serves for connecting the bolt to the piston rod 36.
Fig. 4 shows the grease gun in the configuration according to Fig. 2, i.e. without the cartridge
18 and without the cartridge follow-up piston 32. Here, the squeeze seal 50 has been squeezed
stronger between the disks 52 and 54 and has therefore a larger outer diameter, so that it
sealingly engages the internal surface of the barrel 14. The spacing between the disks 52 and
54 may be adjusted as desired by rotating the piston rod 36 about its longitudinal axis while an
anti-twist mechanism prevents the disk 52 from being rotated, so that the threaded portion 60
of the bolt 56 is screwed deeper into a corresponding threaded bore in the end of the piston rod
36 or is screwed out therefrom. The anti-twist mechanism activated by pushing the disk into
abutment at the press head 12 and then rotating it until cams 62 formed at the press head 12
(Fig. 4) engage into corresponding notches 64 (Fig. 3) in the disk 52.
SPEC-NZ19734-15
In the same way, the piston rod 36 may also be totally screwed off from the bolt 56 so as to
establish the configuration shown in Figs. 1 and 3. When the grease gun is used with the
cartridge 18 in the configuration according to Figs. 1 and 3 and the integrated follow-up piston
34 is pushed to the rear end of the barrel while the cartridge is inserted, the operation of the
grease gun is not compromised by the piston rod 36 which would otherwise project a long
distance out of the rear end of the grease gun.
The embodiment example that has been described above may be modified in many ways.
For example, the connection between the cartridge and the piston pump 20 does not have to be
formed by a plane sealing surface at the press head, as in Fig. 3. Instead, the press head may
form an annular seal which seals at the peripheral edge of the cartridge when the cartridge is
pressed against the press head by the spring 30. It is also possible to conceive of a threaded
neck of the cartridge that is pressed into an annular groove or into the recess 26' of the press
head.
Figs. 5 and 6 show a grease gun 10' according to another embodiment example. In this
embodiment, it is not necessary to detach the piston rod in the configuration in which the
cartridge 18 is used. Instead, this grease gun has a piston rod 36' with an acute tip 66 which
can pierce the follow-up piston 32 of the cartridge.
An integrated follow-up piston 34' is slidable on the piston rod 36'. The integrated follow-up
piston 34' is in this case formed by an elastic disk having sufficient elasticity for adapting to
the different internal diameters of the cartridge 18 and the barrel 14.
When the cartridge 18 has been inserted into the barrel 14 and the barrel has been
screwed onto the press head 12, a light blow onto the handle 40 causes the tip 66 to
pierce the follow-up piston 32 of the cartridge. In all commercial cartridges, the follow-
up piston is formed by a comparatively thin plastic disk which can be pierced in this
SPEC-NZ19734-15
way without requiring a weakening or a rated break point of the follow-up piston 32. The
piston rod 36' is then inserted completely, until the tip 66 is received in a corresponding recess
68 of the press head, as has been shown in Fig. 6.
Fig. 7 shows an example of a grease gun 10'' which differs from the grease gun shown in Fig.
1 in the design of the connector 26. The press head 12 and the adjacent end of the barrel 14
have been shown in an enlarged sectional view in Fig. 8. The connector 26 comprises an
annular collar 70 attached to the press head 12 by means of an adhesive or press fit.
The cartridge 18, at the end facing the press head 12, forms a peripheral conical shoulder 72
tapering towards a cylindrical neck portion 74 which defines an outlet opening of the
cartridge. The neck portion 74 has an external screw-thread 76 which, when the cartridge is
used in combination with certain types of grease guns, permits the neck portion to be screwed
into a screw-thread connector of the press head. The length (preferably more than 10 mm) and
the diameter (preferably more than 30 mm) of the collar 70 have been selected such that the
collar can completely accommodate the neck portion 74 and surround it with radial spacing.
Thus, a gas-tight connection between the piston pump 20 and the cartridge 18 is established by
engagement of a rounded rim 77 of the collar 70 at the shoulder 72. The rim 78, which may
also be configured as a knife-edge, is in contact with the shoulder 72 only along a circular line
of contact. This permits to tightly couple the cartridge to the press head even in case of
cartridges wherein the peripheral rim at the end of the neck portion 44 is not smooth but is
interrupted by gaps or notches, for example. The spring 30 assures that the cartridge is pressed
against the collar 70 with sufficient force. Since a radial spacing exists between the external
screw-thread 76 of the neck portion and the collar 70, no frictional resistance will diminish the
force with which the cartridge is pressed against the collar.
The press head 12 shown in Fig. 8 may be used not only with cartridges of the type that has
been shown in Fig. 8, but may also be combined with various other types of cartridge.
SPEC-NZ19734-15
Fig. 9 shows the press head combined with a cartridge 80 having a different design, which,
instead of the neck portion and the shoulder, has an end wall 82 which is slightly recessed
from the rim of the cartridge. The end wall forms an outlet opening with a diameter of 36 or
37.5 mm. The outer diameter of the collar 70 is less than 35 mm, so that the collar may project
through the outlet opening. A sealing effect is achieved in this case by engagement of the outer
rim of the cartridge at a smooth sealing surface 84 formed radially outward of the collar 70.
SPEC-NZ19734-15
Claims (9)
- THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS: 1. 5 1. A grease gun having a self-priming press head, a barrel detachably coupled to the press head, a cartridge that is accommodated in the barrel, a connector formed at the press head for connecting the cartridge, a support for supporting the cartridge, the support being formed at the barrel in a rear end portion facing away from the press head, a follow-up piston that is slidable in the cartridge, and a spring which biases the cartridge against the press head is 10 provided between the support and a rear end of the cartridge, and wherein the press head has an annular sealing surface at which an open front end of the cartridge is held in abutment by the spring.
- 2. The grease gun according to claim 1, having a piston rod arranged coaxially in the 15 barrel and a follow-up piston guided in the barrel.
- 3. The grease gun according to claim 2, wherein the piston rod is detachable from the barrel. 20
- 4. The grease gun according to claim 3, wherein the piston rod is adapted to be uncoupled from the follow-up piston of the grease gun.
- 5. The grease gun according to claim 4, wherein the follow-up piston of the grease gun has a seal with adjustable outer diameter.
- 6. The grease gun according to any one of claims 3 to 5, wherein the piston rod has an acute tip configured to pierce a disk-shaped follow-up piston of the cartridge.
- 7. The grease gun according to any one of the preceding claims, wherein the cartridge has 30 a neck portion surrounded by a shoulder, and the connector has an annular collar which surrounds the neck portion of the cartridge with radial spacing and sealingly engages the shoulder. <filename>
- 8. The grease gun according to claim 7, wherein the collar has an outer diameter of not more than 36 mm.
- 9. The grease gun according to claim 7 or 8, wherein the collar has a rim shaped to 5 contact the shoulder of the cartridge only on a circular line. <filename> 14.MAS.P01.EP2
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14184528.9A EP2995845A1 (en) | 2014-09-12 | 2014-09-12 | Grease gun |
EP14184528.9 | 2014-09-12 | ||
DE202015102298.0U DE202015102298U1 (en) | 2015-05-05 | 2015-05-05 | grease Gun |
GE202015102298.0 | 2015-05-05 |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ711395A NZ711395A (en) | 2016-08-26 |
NZ711395B true NZ711395B (en) | 2016-11-29 |
Family
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