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Патент USA US2119419

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May 31, 1938.
' E. c. s. CLENCH /
I
'LOCKINGMEANS FORIFLUID'MQTORS ,
Original. Filed Aug, 29, __19s5
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12,119,419 I
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2,119,419
'atented May 3.1, 1938
UNITED STATES PATENT OFFICE
2,119,419
LOCKING MEANS FOR FLUID MOTORS
Edward Claude Shakespeare Clench, Leamington
Spa, England, assignor to Automotive Products
Company Limited, London, England
Original application August 29, 1935, Serial No.
38,460. Divided and this application May'19,
1936, Serial No. 80,643. In Great Britain Sep-'
tember 5, 1934
7 Claims. (Cl. 121-40)
locking means in the motor cylinder unit, said
This invention relates to remote control appa
means being released;
Referring ?rstly to Figure. 1 it will be seen
that the motor cylinder unit indicated at 50 is fed
from a pair of single acting master cylinders l2 01
and- [3 by means of banjo connections 41 and
pipe lines 48 and 49, the master cylinders I2 and .
l3 being ?tted with a common piston element
4 l4, the position of which is governed by an arm
l6 connected with an operating member indi- l0
ratus of the kind in which liquid pressure in one
)1‘ more pipe lines serves as the medium for trans
mitting movement from a master cylinder to a
slave cylinder unit.
It is the object of the present invention to
provide an improved system and constructional
form of motor cylinder unit in which means are
incorporated for preventing the slave cylinder
setting from being altered by forces applied ‘ cated at 25 and carried by a spindle 22. Thus
thereto other than the pressure liquid received when the member 25 is moved to the right the
as a result of the master cylinder being actuated. piston element I4 passes to the left expelling liq
The present invention providesa liquid pres
uid under pressure from the master cylinder l2
sure remote control system having a device for through, the pipe line 48 to the remotely placed 15
mechanically locking the setting of the member motor cylinder 50. At the same time the pipe
actuated by the motor cylinder unit, said system line 49 serves to transmit liquid expelled from the being characterized by the fact that said locking right hand side of the motor cylinder back to the
device is automatically released concurrently other master cylinder i3, within which, of course,
with the passage of pressure liquid from the mas
the piston element I4 is receding.
1
20
ter cylinder into the motor cylinder, said release
The construction of motor cylinder unit illus
being effected in the motor cylinder itself or in
an auxiliary cylinder supplied in common there
with from the master cylinder. The invention
further provides an improved system which is
characterized in that the locking device is effec
tual at any setting of the slave cylinder unit, and
is automatically released by pressure liquid forced
into the slave cylinder unit by the master cylin
trated as an example of the. present invention
comprises a substantially tubular cylinder 5|
having extending coaxially therethrough a rod 52
serving as the operated element and provided 25
with a piston 53 ?tted with rubber cups 54 and 55,
said piston being held ?rmly upon the rod 52
by means of a pin 56. It is important that locking
means should be provided for the rod 52 so that
der.
As a further feature the invention provides a
forces applied thereto, other than operating 30
forces, will not be able to alter the setting of said
double-acting motor cylinder unit for a two pipe
line remote control system, the cylinder of said
rod 52, and for'this purpose a locking means is
provided at each end of the motor cylinder unit
unit being divided by a piston into two. compart- ‘
50.
ments, each of which latter is bounded by a pres
sure-responsive member serving, when liquid is
forced into either of the working compartments,
to release automatically a one-way locking device
and thus permit relative movement of the cylin
der and piston under the in?uence of said liquid.
The motor cylinder unit may be provided with
The left hand locking means is shown in sec
tion in Figure 1, but it will be understood that 35
the right hand locking means is exactly similar in
construction, although it is, of course, adapted to i
work in the opposite direction. The working
space 58 is bounded by an auxiliary cup washer or
piston 59 which bears against a sleeve BD'haVing a 40
circumferential series of perforations for the
guidance of a corresponding number of balls 6|.
These balls are‘normally urged by a spring 65
a locking device which acts as a one-way clutch,
and in a particular example as applied to a
double-acting slave cylinder, a pair of one-way
into contact with the interior frusto-conical sur
face of a wedge ring 62, which is held in position 45
by means of a gland nut 63 and which serves to
work in opposition, thus in effect locking the set
ting of the motor cylinder unit against unwanted , support a stop washer 64 cooperating with a cir--~
cumferential ?ange formed upon the sleeve 60.
movement in both directions.
It will be seen that any tendency to move the rod
The invention is illustrated in the accompany
,' locking devices are provided and are adapted to
,‘ing drawing in which:—-
i
_
,
Figure 1 is a part sectional plan showing va
52 to the right will be counteracted by the wedg- 50
ing of the balls of theleft hand locking means.
motor cylinder" unit connected with a master ' while a similar‘tendency vactingtowards the left
will be prevented from moving the rod 52 by
cylinder arrangement as described in our co
pending application Serial No. 38,460; and
Figure 2 is a fragmentary sectional plan of the I
means of the locking balls at the right hand end
of the motor cylinder 50. When, however, the
2
2,119,419
rod 52 is to be moved hydraulically by the oper
ating lever 25, pressure ?uid entering say the left
hand working space .58 ?rst presses up slightly
the auxiliary cup washer 59 thus moving the
sleeve 60 to the position shown in Figure 2 and
disengaging the balls 6| from the ring 62.
The hydraulic pressure thereafter acts upon the‘
piston 53, thus moving the rod 52 to the right.
'When the requisite movement has been made the
10 spring 65 once more locks the balls 6| against
the ring 62.
'.
a piston rod extending coaxially through the cyI
inder and attached to the main piston, an aux
iliary piston ?tted at each end of the cylinde
and formed with a circumferential series of hole:
balls located in the holes and engaging the pis
ton rod at their inner parts, a tapering wall upo:
the cylinder which wall is engaged by the oute
parts of the'balls, and a spring urging the am:
iliary piston so that the balls tend to jam be
tween the tapering wall and the piston rod.
'
5. For a liquid pressure remote control systerr
It should also be understood that the look ' a motor unit comprising a cylinder, a main pis
ing device shown in Figures 1 and 2 can equally ton dividing the cylinder into two working space:
well be incorporated with a closed liquid pressure a piston rod carrying the piston, and lockim
15 system, that is, one in which the pipe lines are
means disposed within the cylinder, said ‘look
not relieved of pressure between operations.
ing means consisting of two separate one-wa:
This application is a division of application frictional wedge devices in which the resistanc1
?led August 29, 1935, Serial No. 38,460.
to .movement increases as the external force
What I claim is: ‘
tending to overcome the locking increases, S8.i(
20
1. For a liquid pressure remote control sys
tem, a motor unit comprising a cylinder, a main
wedge devices being arranged in opposition anc
acting between the cylinder and the piston roc
at any setting of said piston rod, each of saiC
wedge devices being released by the entry 01
liquid under pressure into that side of the cylin
der causing movement of the piston rod in the
piston dividing said cylinder into two working
spaces, an auxiliary piston within said cylin
der,-locking means associated with the auxiliary
25 piston and adapted to lock the piston rod rela
tively to the cylinder in any position, said aux
iliary piston ?rst being moved by liquid forced
into the cylinder, thus releasing the locking means
direction normally prevented by said wedge de
vice.
6. For a liquid pressure remote control sys
tem, a motor unit comprising a cylinder, a main
and enabling the main piston to move under the
30 in?uence of the liquid.
piston within said cylinder, an, auxiliary piston
bounding the working space within said cylinder
and locking means for preventing movement of
the main piston, said locking means being‘ of the
form in which ‘the locking effect, which takes
place automatically at any position of the main
piston, increases as the external force tending
to overcome said locking effect increases, and the
locking means being connected with the auxiliary
piston so that movement of said auxiliary pis
ton under the action of liquid pressure withi
2. For a liquid pressure remote control system,
a motor unit comprising a cylinder, a main pis
ton dividing'said cylinder into two working spaces,
an auxiliary piston in each of said spaces, and
a pair of opposing one-way locking devices each
adapted to be rendered inoperative by one of
the auxiliary pistons when liquid under pressure
enters the corresponding working space, thus
venabling the main piston to be moved by said
40
liquid.
'
3. For a liquid pressure remote control system,
a motor unit comprising a cylinder, a-main pis
ton dividing said cylinder into two working
spaces, 'an auxiliary piston bounding each of said
spaces, and a one-way wedge device associated
with each of the auxiliary pistons, each of said
. wedge devices comprising a locking element en
gaged within a chamber bounded by axially con
verging walls carried by the cylinder and piston
rod respectively, ‘anda spring which urges the
locking element towards a jamming position vwhile
- the auxiliary piston is arranged to press the lock
ing element in the reverse direction, so as to
release the wedge device when liquid is forced
55 under pressure into- thatworking space bounded
by the respective auxiliary piston.
‘
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4. For aliquid pressure remote control system
a motor unit comprising a cylinder, a main pis
ton dividing said cylinder into two working spaces,
0
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the cylinder releases the locking means.
‘
'7. For a liquid pressure remote control sys
tem, a motor unit comprising a cylinder, a main
piston within said cylinder, an auxiliary piston
bounding the working space within said cylin
der, and locking means for preventing movement
of the main piston, said locking means com
prising a one-way wedge device in which the
locking effect, which takes place automatically
at any position of themain piston, increases as
the external force tending to overcome said lock
ing e?ect increases, and said locking means be
ing connected with the auxiliary piston" so that
movement of said auxiliary piston under the ac
tion of liquid pressure within the cylinder re
leases the locking means.
' EDWARD CLAUDE
,
'
SHAKESPEARE» CLENCH. _
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