close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3081017

код для вставки
March 12, 1963
H. A. LIGHTBURN
3,081,007
HYDRAULIC JACK
Filed 001;; 25, 1960
2 Sheets-Sheet 1
March 12, 1963
H. A. LIGHTBURN
3,081,007
HYDRAULIC JACK
Filed Oct. 25, 1960
2 Sheets-Sheet 2
United States Patent Office
3,081,007
Patented Mar. 12, 1963
1
2
3,081,007
Harold Anderton Lightburn, Adelaide, South Australia,
Australia, assignor t0 Lightburn & Co. Limited,
Camden, South Australia, Australia
.
HYDRAULIC JACK
Filed Oct. 25, 1960, Ser. No. 64,824
Claims priority, application Australia Oct. 27, 1959
-
4 Claims. (Cl. 222--318)
This invention relates to an
improved hydraulic jackv
and more particularly it relate-s to an improved hydraulic
jack of the type which may be used on motor vehicles or
the like.
‘
j
-
-Hydraulic jacks ‘of many types have been proposed here
tofore, but most of the hydraulic jacks in the lower price
range have'been completely'sealed so that it becomes
dii?cult or impossible to service them.
'
The ball valve 24 serves as an inlet valve and engages
its seat 28 when the pump piston 22 is moved downwardly
on the pumping stroke, any hydraulic fluid in the passage
29 being then forced to push the outlet valve 25 from its
seat 30. The outlet valve is free to move in an enlarged
portion of the bore 23, but is urged against its seat 30
by a spring 31 which is retained by a screw threaded
member 32 screwed into the end of the bore 23. A duct
33 opens downwardly from adjacent the outlet valve 24
to provide communication for the hydraulic fluid from
the pump 21-22 to a channel 34 in the valve block which
communicates with the channel 17'.
The screw threaded member 32, which has a screw
driver slot in its outer end, serves to con?ne the two ball
valves 24 and 25 in the bore 23 and to provide a seat 35
for the relief ball valve 26. The relief ball valve 26 is
held against its seat 35 by means of a pair of springs 38
and 39 acting on a rel?e lever 40‘, the release lever carry
draulic jack which, though of relatively inexpensive con
ing a screw threaded adjusting member 41 which is hol
struction, can nevertheless be dismantled for service pur 20 low and engages one end of the spring 38, the other end
poses.
of which engages an adjustment plug 42 in a service plug
The main object of this invention is to provide a hy
According to this invention the improved hydraulic
' 43 which is screwed into a box 44 welded into the lower
jack comprises a pump and ram carried in a housing and
end of the housing 2.
provided vwith means to allow actuation of the pump to
The release lever 40 has its lower end engaged in a slot
raise the ram and actuation of a release mechanism to 25 45 in the base 1 of the jack, so that it may rock through
lower the ram, the invention being characterised in that a
a limited angle due to clearance in the width of the slot
valve block in the housing carries valves, and by a service
45 over the thickness of the metal comprising the lever 40.
plug in the housing which aligns with the valve block and
> The lifting capacity of the jack may be varied by chang
valves to allow the valves to be removed from the valve
ing either or both the springs 38 and 39‘. The ?nal ad~
block and housing for servicing.
" A further feature of the invention is the arrangement of
the release mechanism in such a manner that the pump
and release mechanism can be withdrawn through a gland
in the housing‘ which is, the gland for the pump. ' Simi
l'arly the rarnjcan be withdrawn through the. ram gland.
To enable the invention to be more fully understood an
embodiment thereof will now be described with reference
to the accompanying drawings in whichi
FIG. 1 is a perspecitve view of a hydraulic jack'with
portion of the housing broken ‘away to show the internal
mechanism,
I
i
'
1"
'
>
Y
‘Y
'
'
' FIG. 2 is a longitudinal section? of the'hydraulic jack,
and
.
.
.
,_
'
.
I FIG. 3 is a fragmentary plan vview with the housing and
pump plunger sectioned on line 3-—3 of FIG. 2.
According to the embodiment illustrated, the hydraulic
jack comprises a base 1 to which is welded a housing 2.
' A ram cylinder 4 is also welded to the base 1 and is in
alignment with an opening 5 ' in the housing, the ram
justment is made by, means of the adjustment plug 42
which is locked in its ?nal adjustment by means of the
soft metal plug 64. Plug 64 is expanded into place by
means of applied pressure such as a squeeze or hammer
blow. The plug 64 is also the ?nal oil sealing medium
betweenservice plug 43 and the adjustment plug 42.
The lever is restrained side-ways by wings 46 on the
release lever which ?t on either side of the pump cylinder
21. The lever 40 is bent inwardly towards the pump pis
ton 22', and is retained at its upper end adjacent to the
piston 22 by means of the retaining spring 39 which em
braces the pump cylinder 21 as well as the release lever
40. This spring 39 is arranged at an angle so as to have
a component pulling the release lever 40 down into the
slot 45.
Guide members 47 are welded to the block 20
to further guide the lever 40.
.
The pump piston 22 has an operating stem 48 extend
ing upwardly through a pump gland 49 on the housing 2,
and a cam ‘50 is welded to this stem 48 to be in the path
of the upper end 51 of the lever 40. The stem 48 has
cylinder 4 comprising a‘len'gth of tubing machined at its
50 at its top an eye 52 through which an operating lever may
open or top end to form a mount to receive a ram gland
be placed to engage the socket 53 in the housing 2.
6. The gland 6 carries sealing rings 7 and 8 held in posi
Rotation of the stem 48 of the piston 22 about its axis
tion by a oirclet 9.
'
The ram 10 is internally threaded and carries the
threaded stem 11 which has a cap 12 tolengage the article 55
to be raised and lowered. The lower end of the ram is of
increased diameter ‘to neatly engage theinside- of the ram
cylinder
4.
u
I
.
_
causes ‘the cam 50 to push the lever 40 outward to com
press the spring 38 and extend the spring 39 which retain
it against the relief ball valve 25, thus releasing the relief
ball valve 26 from its vseat_35 and allowing the hydraulic
?uid from the cylinder 4 to discharge back into the hous
ing 2 through the ducts 17, 34 and 33.
> The “lower end of the ram cylinder 4 isin communica
' The clearance between the above mentioned cam 50
tion for ?uid ?ow with a pump bymeans of a channel 17
and release lever 40 in the engaged position can be ad
in a member 18 which joins the ram cylinder 4 to the valve 60 justed by adjusting the screw threaded member 41 at the
block 20, the valve block 20 being welded to the base
lower end of the release lever 40‘, this member Ibeing
1 and also to the member 18 and having the pump cylin
normally locked against rotation by the lock nut 55.
der 21 welded to it so that the pump cylinder 21 is sub
The stem 48 passes through the pump gland 49, this
stantially parallel to the ram cylinder 4.
The pump plunger 22 is slidable within the pump cylin
der 21.
The valve block 20 has a bore 23 through it which
varies in its diameter and accommodates two ball valves
24 and 25 respectively, a gauze strainer 27 being pushed
gland 49 consisting of resilient washers 56 held between
upper and lower circlets 57 and 58. By removing the
upper circlet 57 the washers 56 can be withdrawn from
the tubular gland mount 60 in grooves of which the
circlets 57 and 58 engage, and when the piston 22 is with
drawn, the opening left through the mount 60 is su?ici
into the bore 23 where it communicates with the inside 70 ently large to withdraw the lever 40 upwardly through
of the housing 2.
such opening.
3,081,067
A tool can also be inserted through thegland opening.
to remove or replace the gauze strainer 27.
A ?ller plug 52 allows the hydraulic ?uid to be ?lled
4
‘such that when removed both ‘the inlet ‘and the outlet _
ball valves are withdrawablefrom the said block, said
relief ball valve engaging a seating on the said member.
3. A pressurized liquid supply for a hydraulic jack a-c—
into the housing 2 and serves also as a level indicator
to ensure that the ?uid level is kept at the correct height.
The line 63 indicates the ?uid level.
The service plug 43 is screwed into the boss 44
cording to claim 1 further characterised in that the said
valve block has a stepped bore through it shaped at one
end to take a strainer, seatings formed within the block
by expansion of said bore, ‘ball valves on said seatings
and is co-axial with the bore 23 containing the ball valves
with a smaller ball valve adjacent the strainer serving as
24 and 25 of the valve block 20, the member 41 also
an inlet valve to the pump and a larger ball valve adjacent
being in line with the bore 23 so that the ball valves 24, 10 the smaller ball valve to serve as the outet valve from the
2S and 26 and the springs 31 and 38 are all co-axially
said pump, a member screwed into the end of the bore
arranged.
remote from the strainer to con?ne a spring between it
The service plug 43 diameter is suf?cient to allow the
and the said outlet ball valve to urge the outlet ball
member 41 and its lock nut to be withdrawn through the
valve on to its seat, said member having a diameter
opening when the plug is removed, and similarly the mem 15 such that when removed both the inlet and the outlet ball
ber 32 and the'various ball valves 24, 25 and 26 and
valves are'withdrawable.axially from the said plug, said
springs 31 and 38 can all be withdrawn or replaced
relief ball valve engaging a seating on the said mem
through the same opening.
ber, a screw thread adjusting member on said lever to
The piston 22, lever 40, spring-39 and gauze strainer
contact said relief ball and of a diameter to allow the
20
27 can be withdrawn through‘the opening left atthe'top
complete valve assembly and spring to be withdrawn
of the housing when the gland washers 56 are'removed,
from the-said pump reservoir when thesaid member is
while the ram 10 can be withdrawn from its cylinder 4
removed; said service, plug being removably held in the.
by' removing the gland 6 after taking out the circlet 9.
said pump reservoir co-axially with the said bore in the
It will be appreciated from the above embodiment that
valve
block, and spring means between the said service
by removal of the pump glands. 6 and 49 from their 25 plug and the said member carried by the said lever and of
mounts, and the service plug 43, the operating members
larger diameter than the member on the said lever where
may be removed or replaced or adjusted as required.
What I claim is:
1. A pressurized liquid supply for a hydraulic jack
by withdrawal of the said service plug gives access to the
said valve mechanism for adjustment or replacement.
4. A pressurized liquid supply for a hydraulic jack
comprising a pump reservoir, a pump- cylinder in said 30 comprising a pump reservoir, a pump cylinder in said
pump reservoir, a pump plunger in said cylinder project
said cylinder, a pump glandin said
pump reservoir axially aligned with said pump plunger
pump reservoir, a pump plunger in said cylinder project
ing from the top of said cylinder, a pump gland in said
pump reservoir axially. aligned with said pump plunger
through which said plunger projects, means to engage a
lever with said pump reservoir and said pump plunger,
' ing from the top of
through which said plunger projects, means to engage a.
lever with said pump reservoir and said pump plunger,
a valve block in said pump reservoir beneath said pump‘.
a valve block in said. pump reservoir beneath said pump
cylinder having a duct communicating with said pump
cylinder having a duct communicating with said pump
cylinder, valve seatings axially aligned in said valve block.
and valves including a release valve on said seatings, a
removable service plug in said pump reservoir‘ axially
cylinder, valve seatings axially aligned in said valve block
40 having di?erent diameters, valves on said seatings to con
aligned with said valve seatings, a release lever having. a
lower end removably engaged on said pump reservoir be
trol in?ow and out?ow to said pump cylinder, a spring
urgingthe out?ow valve on to its seat, an apertured
plug screwed into said valve block co-axially with said
tween said service plug and said valve block and engaging
valve seats, a valve seat in said plug, a release valve on
said release valve, said release lever extending adjacent
said seat, a removable service plug in said pump reservoir
45
said pump cylinder and ‘terminating below said pump
axially aligned with said valve seats, a release lever hav
gland, a cam on said pump plunger adjacent the upper
ing one'end removably disposed between said service plug
end of said release lever to actuate said release lever when
and said valve block and engaging said release valve, said
the pump plunger is rotated, and spring means to urge
release lever projecting adjacent said pump cylinder and
said release lever to hold said release valve on to its seat,
terminating below said pump gland, a cam on said pump
said release lever being of such dimensions as to be with 50 plunger adjacent the upper end of said release lever to
drawable through said pump gland and said valves being
actuate said release lever when the pump plunger is ro
of such dimensions as to be withdrawable through said
tated, and spring means to urge said release lever to hold
service plug.
.
said release valve on to its seat, said release lever being
2. A pressurized liquid supply for -a hydraulic jack
of such dimensions as to be withdrawable through said
55
according to claim 1 further characterised in that the said
pump gland and said valves being of such dimensions
valve block has a stepped bore through it shaped at one
as to be withdrawable through said service plug.
end to take a strainer, seatings formed within the block
by expansion of the said bore, ball valves on said seatings
with a smaller ball valve adjacent the strainer serving as
an inlet valve to the pump and a larger ‘ball valve adja 60
cent the smaller ball valve to serve as the outlet valve
from the said pump, a member screwed into the end of
the bore remote from the strainer to con?ne a spring
between it and the said outlet ball valve to urge the outlet 65
ball valve on to its seat, said member having a diameter
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,254,084
2,466,815
2,618,929
Nilson ______________ __ Aug. 26, 1941
Lightburn ____________ __ Apr. 12, 1949
Bidin ______________ __ Nov. 25, 1952
2,627,722
Johnston ____________ __ Feb. 10, 1953
27,662,475
McLellan ____________ __ Dec. 15, 1953
Документ
Категория
Без категории
Просмотров
0
Размер файла
463 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа