WO2005025452A2

WO2005025452A2 - Low spill farm coupling

Info

Publication number: WO2005025452A2
Application number: PCT/US2004/009660
Authority: WO
Inventors: Dennis Zeiber; Paul J. Wadding
Original assignee: Snap-Title Technologies, Inc.
Priority date: 2003-09-08
Filing date: 2004-03-30
Publication date: 2005-03-24
Also published as: WO2005025452A8; WO2005025452A3; US6830059B1; US6926031B2; EP1664612B8; EP1664612A4; EP1664612B1; EP1664612A2; US20050076961A1

Abstract

A male coupling half includes a male valve and a male body and the female coupling half includes a female valve and an inner body. The inner body is slidingly movable with respect to a housing or manifold. The female coupling half further includes a valve seated against a dump valve body which relieves pressure in the female half of the coupling to enable easy connection of the coupling halves. The male and female valves are locked in their open positions when the coupling halves are fully connected and the female half is pressurized which prevents reverse flow checking in either flow direction. During the disconnection process the male valve is closed before the coupling halves are separated which traps pressure in the male coupling half

Description

LOW SPILL FARM COUPLING

Field of the Invention

The invention is in the field of couplings which may be used on agricultural,

construction or other equipment.

Background of the Invention

There is a need for couplings to communicate hydraulic fluid to and from

tractor mounted hydraulic power sources. There is also a need to communicate

hydraulic fluid to and from agricultural or construction implements. A directional

valve downstream from the power source controls the direction of the fluid in the

hydraulic lines and, hence, the direction of the implement. Interposed between the

directional valve and the load are a manifold and shut off valves. Typically, female

coupling halves are carried in the manifold and male coupling halves are affixed to

hydraulic lines leading to and from the implement. Use of a manifold is optional and

female coupling halves may be mounted directly on the tractor or other device. It is

therefore necessary to provide a coupling having valves which remain open and stable

as the flow direction is reversed and which will not result in the valves closing upon

reversal of flow and unintentionally and undesirably preventing flow (i.e., flow

checking). When an implement is disconnected (uncoupled) from the manifold, it is

desirable to maintain implement position by safely trapping fluid under pressure in the

hydraulic lines between the male half of the coupling and the implement. The trapped

fluid enables safe positioning of the implement until its next use. Sunshine and/or ambient heating further raise the pressure in the hydraulic lines leading to the

implement making it difficult to connect (couple) the male coupling half into the

female coupling half of the manifold for continued operation of the implement. When

an implement is uncoupled from the manifold, fluid is also trapped between the female

half of the coupling and a shut off valve interposed between the manifold and the

directional control valve. Sunshine and/or ambient heating tend to increase the

pressure of hydraulic fluid in the hydraulic lines and in the coupling making it difficult

to couple the halves of the coupling together.

In some applications, shut off valves are used to intentionally trap fluid

between the shut off valve and the load when the load remains connected so as to

maintain the safe positioning of the implement. The shutoff valves or their functional

equivalent may be integral with the directional valve. In this instance too, sunshine

and/or ambient heating tend to increase the pressure of hydraulic fluid in the hydraulic

lines and in the coupling. It is desirable to provide a coupling which makes disconnection of the coupling

halves easier and reduces or eliminates spillage.

It is desirable to provide a coupling which enables the male half of the coupling

to close prior to disconnection of the coupling so as to minimize spillage and so as to

trap pressure in the male coupling half and the hydraulic line leading to the

implement.

It is desirable that the coupling halves be capable of connection under pressure,

that is, with pressure applied to both halves of the coupling. It is further desirable that pressure be reduced or eliminated in the female half of the coupling to facilitate

coupling.

U.S. Patent No. 5,937,899 to Zeiber discloses a female cartridge which is

retained within a manifold. Axial and radial vent valves are disclosed. The '899

patent provides a male half of the coupling which pushes the inner body of the

pressurized female half of the coupling (which includes a pressurized chamber

between a piston and a relief valve positioning member) causing the positioning

member to be displaced in a leftward or rearward direction which causes the venting

of the female member. The male half of the coupling pulls the inner body of the

female half of the coupling rightwardly or forwardly which causes the venting of the

female member. The venting occurs when the male and female halves of the coupling

are connected or disconnected.

U.S. Patent No. 5,709,243 to Wells et al. discloses a low spill female coupling.

A valve having an enlarged head is adapted to receive a male valve from the male half

of the coupling such that the valves remain closed until respective parts thereof are

brought into contact with each other so as to minimize spillage.

U.S. Patent No. 6,095,190 to Wilcox et al. discloses a female coupling half

having internal pressure relief. The female half has three valves: a main valve, a relief

valve and a sliding sleeve valve. The relief valve is a ball and seats against an

elastomeric seal mounted on the back side of the main valve. A push pin having flat

edges operates the relief valve.

U.S. Pat. No. 4,077,433 to Maldavs illustrates a piston valve arrangement with a passageway through the valve to assist in assuring that the male ball valve remains

open in high flow conditions from the male to the female. U.S. Pat. No. 4,881,573 to

Durant illustrates a coupler having two poppet valves. The first poppet engages a ball

check valve formed in the male coupling and the second poppet is actuated by a

manually operated cam. A passageway exists in the piston to allow fluid to be vented

or to pressurize the female valve.

U.S. Pat. No. 4,598,896 to Maldavs illustrates a coupler having a spool and a

port within the spool. An annular seal is fixedly positioned about the port in the spool.

The spool is slidable with respect to the seal which enables pressure to be relieved in

the female during coupling and uncoupling with the male. U.S. Pat. No. 4,303,098 to

Shindelar discloses a coupler having a female half which includes a female valve

having an elongated stem for engaging the male half. The female half of the coupling

is vented by a pivotable cam which moves the inner member of the female half to

release its locking means and then opens a poppet valve to open the outlet port. U.S. Pat. No. 4,249,572 to Shindelar et al. discloses a female half which is self-

relieving. The female half includes dual poppet valves which are linked together. One

of the poppet valves vents the female half of the coupling when the male and female

valves are disengaged and uncoupled.

U.S. Pat. No. 5,730,185 to Wilkins et al. discloses a coupling wherein certain

positions of the adaptor allow the venting of the dispenser half and the receptacle half.

Venting is prohibited by the movement of seals relative to ports and passageways. U.S. Pat. No. 3,730,221 to Vik provides an exterior vent valve. U.S. Pat. No. 4,745,948 to Wilcox et al. discloses a coupling device which

utilizes locking detents which lock a stem against the male valve which prevents

reverse flow checking.

Summary of the Invention A female coupling half for use with a male coupling half is disclosed. The

male coupling half includes a male valve and a male body. The female coupling half

includes an outer body, a housing, an inner body and a female valve. The inner body

is slidingly movable with respect to the housing between a first position and a second

relief position. The housing resides partially within the outer body forming an annular

passageway therebetween.

Another embodiment of the invention employs a female coupling half which

includes a cartridge retained within a manifold. In this embodiment, flow through the

female coupler half is radially directed to a port in the manifold.

In both embodiments, an inner body adaptor is affixed to the inner body. A

dump valve body and lock piston slidingly engage the inner body adaptor. A dump

valve (relief valve) is seated against the dump valve body. A valve lock shaft is

slidingly engageable within the lock piston. During connection of the coupling halves

under pressure, the female valve is affixed to the valve lock shaft and movable

therewith between a first position and a relief position. The male body engages the

inner body member and the male valve engages the female valve urging them from

their first positions to other positions upon insertion of the male coupling half into the

female coupling half. During connection of the coupling halves under pressure, the dump valve

moves with the inner body member actuating the dump valve relieving pressure within

the female coupler half. Before coupling and during venting, the valve lock shaft and

the lock piston are releaseably secured to one another. As coupling begins and venting

occurs the male body urges the inner body of the female coupling half leftwardly and

carries the valve dump body, the valve lock piston, the sliding sleeve, the retainer and

the valve lock shaft with it. Detents carried by the inner body engage the male body

and the inner body member is urged leftwardly. At this time the male valve remains

closed and has not yet engaged the female valve. Further, at this time the male body

has not yet engaged the retainer of the female coupling half.

Coupling continues further by urging the male half of the coupling further into

the female half of the coupling such that the body of the male first engages the retainer

followed by the male valve engaging the female valve. Since the body of the male

engages the retainer slightly in time before the male valve engages the female valve

the retainer and seal carried by the retainer separate slightly from the lip of the female

valve. This enables subsequent repressurization of the female coupler to open the

male valve and to further open the female valve. As the coupling progresses, the

female valve and valve lock shaft are driven rearwardly causing detents carried in the

lock piston to exit a circumferential recess in the valve lock shaft. A lock sleeve is

positioned against a snap ring secured in the sliding sleeve by a spring operable

between a shoulder on the sliding sleeve and the lock sleeve. As the retainer is

engaged by the male body member, the sliding sleeve of the female coupler half is urged leftwardly which, in turn, urges the lock sleeve leftwardly through the spring

operable between the lock sleeve and the sliding sleeve. When the coupling is

disconnected, the lock sleeve is spaced apart from the detents carried in the lock

piston. This allows for the detents to be displaced from the recess in the valve lock

shaft before the lock sleeve drives the detents and the lock piston leftwardly.

Therefore, as the male body engages the retainer followed by the the male valve

engaging the female valve, the sliding sleeve, the valve lock shaft and the lock sleeve

all begin to move leftwardly while the coupling is vented. The movement of the lock

piston is delayed, however, until the lock sleeve drives it leftwardly. Next, the force on the male coupling half (i.e., the force exerted by a human

hand) is removed and the coupling is fully connected but the male valve remains

closed until pressure is applied to the female coupling half. At this time the female

valve is slightly open. As pressurization of the female coupling half begins pressure

equalization of the male and female halves occurs. The male and female valves shift

rightwardly until the valve lock shaft moves sufficiently rightwardly that the detents

carried by the lock piston are urged radially inwardly to engage a circumferential

recess in the valve lock shaft. The lock sleeve secures the detents in the recess while

the coupling is engaged ensuring that the male and female valves in the coupling

remain open during use of the coupling. This prevents unwanted reverse flow

checking.

To disconnect the pressurized coupling, the male coupling half is urged

leftwardly into the female coupling half to vent the female half of the coupling. As the male coupling half is urged leftwardly, pressure in the coupling urges the coupling

halves apart and acts upon the interface between the body of the male coupling half

and the inner body member locking the detents carried by the inner body member into

engagement with the land on the locking sleeve. Once pressure is vented from the

coupling, the male body no longer applies force on the detents carried by the inner

body member allowing them to move radially inwardly and out of frictional

engagement with the land on the lock sleeve. A spring is operable between the vent

valve and the valve lock shaft. The spring is compressed as the vent valve engages the

housing or, in another embodiment, the manifold body. As pressure is relieved by the

vent valve from the coupled condition, pressure is first reduced in the piston chamber

formed by the lock piston, the valve dump body and the inner body adaptor. The

piston chamber is separated from the remainder of the female coupling half by a

resistance in the form of an annular passageway about the stem of the vent valve and

the inside diameter of the valve lock shaft. An additional resistance in the form of a

vent passageway is formed in the vent lock shaft. These resistances isolate the

chamber from the fluid pressure external to the valve lock shaft. In particular, a seal

between the lock piston and the inner body adaptor and a seal between the valve lock

shaft and the lock piston experience relatively lower pressure as the chamber is vented

as compared to seals which reside externally to the valve lock shaft. Specifically, a

seal which operates between the valve lock shaft and the lock piston and a seal which

operates between the sliding sleeve and the lock piston experience relatively high

pressure. The differential pressure on the aforementioned seals results in shuttling the valve lock shaft leftwardly enabling the male and female valves to seat prior to

disconnection. At this time the male valve engages the female valve such that no

space is created therebetween so as to minimize fluid spillage on disconnection. The

coupling halves are then pulled apart and separated with pressure trapped within the

male coupling half so as to enable the safe positioning of an implement.

If the male and female coupling halves are not pressurized the male coupling

half is inserted into the female coupling half urging the inner body member leftwardly.

The inner body adaptor, the valve dump body, and the relief valve are all moved

leftwardly under the urging of the male body against the inner body member of the

female valve. The male valve engages the female valve as coupling progresses. The

relief valve engages the bore of the manifold and the spring operable between the

relief valve and the valve lock shaft overcomes the spring operable between the male

valve and the canister in the male valve opening the male valve. The female valve

opens simultaneously with the opening of the male valve. The coupling may be easily separated if it is not under pressure as the coupling

halves are not pressure locked together. Separation in the absence of pressure is

accomplished by pulling the male body member and valve away from the female half

of the coupling. A spring operable between the inner body adapter and the sliding

sleeve urges the sliding sleeve and retainer rightwardly. Similarly a spring operable

between the relief valve and the valve lock shaft urges the valve lock shaft and the

female valve rightwardly to close the female valve. As the male valve is withdrawn

from the female valve, a spring operable between the canister of the male coupling half and the male seal retainer urge the male valve to its closed position.

It is an object of the present invention to provide a coupling which is a low spill

coupling on connection and disconnection.

It is a further object of the present invention to provide a coupling which may

be easily connected with pressure applied within the female coupling half and/or the

male coupling half.

It is a further object of the present invention to provide a coupling having a

female coupling half which is manifold mounted.

It is a further object of the present invention to provide a coupling which locks

the valves of the male and female coupling halves in the open position and which

prevents reverse flow checking of the male and female valves in the event that the

direction of the flow is reversed or changes.

It is a further object of the present invention to provide a coupling which opens

and locks the male and female valves of the coupling halves in the open position by

applying pressure to the female half of the coupling once it is coupled together with

the male.

It is a further object of the present invention to provide a coupling which

enables the male coupling half to trap pressure therein upon disconnection of the

coupling. These and other objects of the invention will be better understood when the

Brief Description of the Drawings, Description of the Invention and Claims set forth

below are read. Brief Description of the Drawings

Fig. 1 is a cross-sectional view of a manifold illustrating a female half of the

coupling inserted therein.

Fig. 1A is a cross-sectional view of a manifold illustrating the male half of the

coupling entering the female half of the coupling which is being vented.

Fig. IB is a cross-sectional view of a manifold illustrating the male half of the

coupling fully inserted into the female half of the coupling which is being vented.

Fig. IC is a cross-sectional view of a manifold illustrating the coupling fully

connected with the male valve of the male half of the coupling closed. Fig. IC also

illustrates the female valve off its seal, slightly open.

Fig. ID is an enlargement of a portion of Fig. IC illustrating the closed male

valve and the slightly open female valve.

Fig. IE is a cross-sectional view of the coupling with the female half

pressurized, partially opening the male valve of the male coupling half. Fig. IF is a cross-sectional view of the coupling with the male and female

valves in the fully open position.

Fig. 1G is a cross-sectional view of the coupling in the process of disconnection

with pressure being relieved from the female half of the coupling and the male and

female halves of the coupling shifting leftwardly toward the closed position. Fig. 1H is an enlargement of a portion of Fig. 1.

Fig. II is a cross-sectional view of the coupling wherein the uncoupling process

has proceeded further with the male and female valves in the closed position. Fig. 2 is a cross-sectional view of the second embodiment of the female half of

the coupling illustrated disconnected from the male half of the coupling.

Fig. 3 is a cross-sectional view of the second embodiment of the female half of

the coupling illustrated connected (coupled) with the male half of the coupling. Fig. 4 is a cross- sectional view of the second embodiment of the female half of

the coupling illustrated with the valves in the closed position and the female coupling

half vented.

Fig. 4A is an enlargement of a portion of Fig. 4.

Fig. 5 is a cross-sectional view of the second embodiment of the female half of

the coupling illustrated with pressure applied to the female half of the coupling to

open the male and female valves.

Fig. 6 is a cross-sectional view of the housing.

Fig. 6A is a left side view of the housing.

Fig. 6B is a right side view of the housing. Fig. 7 is a schematic of one application of the first embodiment of the present

invention.

A better understanding of the drawings and the invention will be had when

reference is made to the Description of the Invention and Claims which follow

hereinbelow.

Description of the Invention

Fig. 1 is a cross-sectional view 100 of manifold 101 with a female half of the

coupling inserted therein. Figs. 1-11 illustrate a first embodiment of the invention which includes a manifold mounted female coupling half. Figs. 2-6B illustrate a

second embodiment of the invention.

Fig. 1 illustrates a cartridge of female coupling elements carried in a manifold

101. In Fig. 1, the female coupling half is illustrated. Conduit 102 leads to a

hydraulic energy source. Vent conduit 103 communicates with bore 104 in the

manifold 101. Spring 105 is operable between manifold body 101 and inner body

110. As the male body engages the inner body 110 it is urged leftwardly against the

force of spring 105. See Fig. 1A. Once inner body 110 is moved far enough

leftwardly, relief valve 121 engages indentation 166 in bore 104. Relief valve 121

includes pin 164 having end 165 which engages indentation 166 in the bore 104.

Instead of indentation 165, a flat surface terminating the bore 104 may be used.

Valve 121, a relief valve, operates against seat 160 on valve dump body 119.

Valve lock shaft 122 is hollow and stem 112 of valve 121 slides within valve lock

shaft 122. There is a very small clearance 132 between stem 112 and the inside

diameter of valve lock shaft 122. Spring 135 is operable between valve lock shaft 122

and valve 121 urging valve 121 to engage seat 160 of valve dump body 119. See Fig.

1A.

Valve dump body 119 is slidingly engageable within inner body adaptor 118

which is, in turn, affixed to inner body 110. Lock piston 120 is also slidingly

engageable within inner body adaptor 118. Spring 133 urges the dump valve body

119 and lock piston 120 apart. Lock piston 120 is restrained in its rightward

movement by a shoulder on the inner body adaptor 118 and dump valve body 119 is restrained in its leftward movement by snap ring 134 in a groove in the inner body

adaptor 118. Inner body adaptor 118 is threaded 123 to the inner body 110.

Still referring to Fig. 1, female valve 124 is threaded 125 to valve lock shaft

122 and is movable therewith. Sliding sleeve 117 resides generally between the inner

body member 110 and inner body member adaptor 118 and the valve lock shaft 122.

Retainer 116 is threaded to the sliding sleeve 117 and retains seal 151 which abuts and

seals lip 154 of valve 124 as illustrated in Fig. 1. Seal 151 is preferably a polymeric

nitrile seal. Figs. 1 A and IB illustrate male body 301 engaging retainer 116 separating

seal 151 away from lip 154 which enables the repositioning of valves 124, 302 to their

open position upon pressurization of the female half of the coupling.

Spring 143 is operable between inner body adaptor 118 and a shoulder on

sliding sleeve 117. Sleeve 117 is restrained in its movement in the rightward direction

when viewing Fig. 1 by the inner body 110. Lock sleeve 168 resides generally

between sleeve 117 and lock piston 120. Spring 167 is operable between a shoulder

on sliding sleeve 117 and lock sleeve 168. Leftward movement (viewing Fig. 1) of

lock sleeve 168 is prevented by snap ring 144.

Lock piston 120 includes a plurality of apertures 139A in which reside detents

139. As viewed in Fig. 1, some of the detents 139 are illustrated sitting in recess 155

and some of the detents 139 are shown out of the recess 155 due to gravity. Valve

lock shaft 122, under certain conditions discussed below, is free to move axially

rearwardly (leftwardly) upon the urging of the male half of the coupling which is not

shown in Fig. 1. Valve lock shaft 122 includes hollow sections or passageways 131, 126. Vent passageway 127 communicates with apertures 128 in the sliding sleeve 117

which in turn communicate with circumferentially spaced apertures 130 in the inner

body 110. Passageway 129 communicates with conduit 102 to supply or return fluid

depending on the position of the directional valve. Seals 141, 148 seal the inner body

110 with respect to the manifold 101 and the seal retainer 109, respectively. Seal 147

prevents leakage between the seal retainer 109 and the manifold 101.

Adaptor 107 is threaded 106 into manifold 101. Locking sleeve 108 is biased

by spring 114 to a forward position as illustrated in Fig. 1. Locking detents 113

carried in apertures 159 of inner body 110 are secured in position by land 111 on

locking sleeve 108.

Still referring to Fig. 1, entrance seal 150 prevents leakage between the male

body and inner body 110 upon entrance of the male body into the female coupling

half. Seal 149 prevents leakage between the interface between retainer 116 and inner

body 110. Seal 142 prevents leakage between the inner body adaptor 118 and inner

body 110. Seal 140 prevents leakage between the sliding sleeve 117 and the inner

body adaptor 118. Seals 138, 146 prevent leakage between the valve lock shaft 122

and the lock piston 120. Seal 136 prevents leakage valve dump body 119 and inner

body adaptor 118. Seal 137 prevents leakage between lock piston 120 and inner body

adaptor 118. Seal 145 prevents leakage between the sliding sleeve 117 and lock piston

120.

Valve 124 includes an opening 152 having a cylindrical bore 153 for reception

of the male valve. Lip 154 engages nitrile seal 151 as illustrated in Fig.l. Atmospheric vent 175 resides between sliding sleeve 117 and inner body

adaptor 118. As sliding sleeve 117 is moved toward the inner body adaptor against

the bias of spring 143, air is evacuated to vent 103. Air escapes along passageway

175 A as illustrated in Fig. 1 A and along the interface between the inner body 110 and

the adaptor 118.

Fig. 1A is a cross-sectional view 100A of a manifold illustrating the male half

of the coupling entering the female half of the coupling. Body 301 of the male

coupling half engages the detents 113 carried in the inner body member 110 and

drives the inner body member 110 leftwardly as illustrated in Fig. 1A. Relief (dump)

valve 121 is carried by the body adaptor 118 affixed to the inner body member 110,

the dump valve body 119 and the lock piston 120. Spring 135 biases relief valve 121

against a seat 160 on the dump valve body 119. As the inner body member 110 is

urged leftwardly, pin 164 of relief valve 121 engages the indentation 166 in bore 104

of the manifold which vents the female half of the coupling. As viewed in Fig. 1A,

venting occurs prior to the male valve 302 engaging the female valve 124 and prior to

the male body 301 engaging the retainer 116.

Still referring to Fig. 1 A, it will be observed that prior to engagement of the

male and female valves that some of the detents 139 carried by apertures 139A in the

lock piston 122 reside loosely in recess 155. Other detents 139 are not in recess 155

because gravity causes them to exit recess 155.

Fig. IB is a cross-sectional view 100B of a manifold illustrating the male half

of the coupling fully inserted into the female half of the coupling. Detents 113 are shown engaging a circumferential recess 305 in male body 301 in Fig. IB. Referring

to Fig. IB, male and female valves 124, 302 are in engagement and valve lock shaft

122 is driven rearwardly such that the detents 139 exit recess 155 and ride on the

exterior of valve lock shaft 122. Lock piston 120 moves leftwardly by engagement of

lock sleeve 168 with detents 139 carried in apertures 139A in lock piston 120. Spring

167 is operable between lock sleeve 168 and sliding sleeve 117. Lock sleeve 168 is

driven by spring 167 which, in turn, is driven by sliding sleeve 117. As sliding sleeve

117 is driven leftwardly, air in volume 175 (Fig. 1) exits through passageway 175A

and past the interface between the inner body member 110 and the body adaptor 118. Still referring to Fig. IB, lip 154 of valve 124 does not engage seal 151. See

also Figs. IC and ID which illustrate a gap 156 between the inner portion 158 of seal

151 and lip 154 of valve 124. In Fig. IB, inner body member 110 is shown fully

leftwardly with springs 128, 133, 135 and 143 compressed. In Fig. IB the female

coupling is vented and male body 301 has forced retainer 116 and seal 151 away from

lip 154 of female valve 124. This positional relationship of the retainer 116 and seal

151 with respect to lip 154 is fixed and maintained by body 301 engaging locking

detents 113 as illustrated in Fig. IC. Even after the force applied by hand to body 301

is released, land 111 in sleeve 108 keeps retainer 116 and seal 151 slightly spaced

apart from lip 154 of valve 124. Fig. IC is a cross-sectional view 100C of a manifold illustrating the coupling

fully connected with the male valve 302 of the male half of the coupling closed.

Female valve 124 is open as viewed in Fig. ID, an enlargement of a portion of Fig. IC. Referring to Fig. ID, female valve 124 is illustrated as spaced apart from seal 151

and slightly open. As illustrated in Figs. IC and ID, the female half of the coupling is

ready for pressurization against a closed and pressurized male valve 302. The opening

of male valve 302 is facilitated by pressurizing of the female half of the coupling and

the volume 156. Volume 156 leads to the interface 184 between valve 302 and male

body 301 exposing seal 183. When the female half is pressurized the entire inner

surface 154A of the lip 154 of the valve 124 is subjected to pressure as is a portion

302 A of the male valve, the interface 184 between valve 302 and male body 301, and

seal 183. See, Fig. ID. Fig. IE is a cross-sectional view 100E of the coupling with the female half

pressurized, partially opening the male valve 302 of the male coupling half and further

opening the female valve 124. Reference numeral 173 represents pressure applied to

the female half enabling the opening of the male half under pressure. It will be

noticed in Figs. IC and IE that the valve lock shaft is not locked with respect to the

lock piston. As pressure is applied to the female half, and, more specifically, as

pressure is applied to surface 179 of valve 124 ( the inner surface), the interior

rightward looking surfaces of the inner body 110, sliding sleeve 117, and lip 154A of

valve 124 urge the valve 124 and the valve lock shaft 122 rightwardly opening the

valves 124, 302 until balls 139 enter recess 155 as illustrated in Fig. IF. Additionally,

as pressure is applied to seals 138 and 146, the area of seal 138 and the rightward

looking area of valve lock shaft 122 is slightly larger than the area of seal 146 and the

leftward looking area of valve lock shaft 122 which contributes to the rightward movement of valve lock shaft 122 and valve 124. Balls 139 are urged into recess 155

by spring 167 and lock sleeve 168. Spring 167 is under compression as pressure is

applied to the female half. Spring 167 secures lock sleeve 168 in engagement with

balls 139 so that they may not be removed from recess 155. Fig. IF is a cross-sectional view 100F of the coupling with the male and female

valves 124, 302 in the fully open position. Reference numeral 172 indicates

bidirectional flow through the fully open coupling.

If the male and female coupling halves are not pressurized, the male coupling

half is inserted into the female coupling half urging the inner body member 110

leftwardly. The inner body adaptor 118, the valve dump body 119, and the relief

valve 121 are all moved leftwardly under the urging of the male body 301 against the

inner body member 110 of the female half. The male valve 302 engages the female

valve 124 as coupling progresses. The relief valve 121 engages the bore of the

manifold and the spring 135 operable between the relief valve 121 and the valve lock

shaft 122 overcomes the spring 180 operable between the male valve 302 and the

canister 181 in the male coupling half opening the male valve 302. The female valve

124 opens simultaneously with the opening of the male valve 302.

The coupling may be easily separated if it is not under pressure as the coupling

accomplished by pulling the male body member 301 and male valve 302 away from

the female half of the coupling. A spring 143 operable between the inner body adapter

118 and the sliding sleeve 117 urges the sliding sleeve 117 and retainer 116 rightwardly. Similarly a spring 135 operable between the relief valve 121 and the

valve lock shaft 122 urges the valve lock shaft 122 and the female valve 124

rightwardly to close the female valve 124. As the male valve 302 is withdrawn from

the female valve 124, a spring 180 operable between a canister 181 and the male seal

retainer 182 urge the male valve 302 to its closed position.

Fig. 1G is a cross-sectional view 100G of the coupling in the process of

disconnection with pressure being relieved from the female half of the coupling and

the male and female valves 124, 302 of the coupling shifting toward the closed

position. Still referring to Fig. 1G as pressure is relieved from the coupling by a

person urging the male body 301 leftwardly, pressure is reduced in chamber 171 first

followed by a reduction in pressure in the volumes defined by reference numerals 131

and 126, followed by a reduction in pressure in volume 170. To disconnect the

pressurized coupling, the male coupling half is urged leftwardly into the female

coupling half to vent the female half of the coupling. As the male coupling half is

urged leftwardly, pressure in the coupling urges the coupling halves apart and acts

upon the interface 185 between the body 301 of the male coupling half and the inner

body 110 of the female coupling half locking the detents 113 carried by the inner body

member into engagement with the land 111 on the locking sleeve 108. Once pressure

is vented from the coupling, the male body removes tension from the detents 113

carried by the inner body member allowing them to move radially inwardly and out of

frictional engagement with the land 111 and apertures in the inner body. Referring to

Fig. 1H, an enlargement of a portion Fig. 1G, reference numeral 132 illustrates a small circumferential gap around stem 112 and between valve lock stem 122. Gap 132 is in

effect an orifice or resistance which retards the flow of hydraulic fluid. Likewise,

small passageway 127 is in effect an orifice or resistance which retards the flow of

hydraulic fluid. Referring still to Figs. 1G and 1H, as valve 121 moves from its seat chamber

171 is vented and pressure on seals 137 and 138 is lowered which results in the

leftward movement of lock piston 120 and valve lock shaft 122. Relatively high

pressure is applied to seals 145 and 146 which also tend to urge the valve lock piston

and the valve lock shaft 122 leftwardly. Movement of the valve lock shaft 122

leftwardly enables closure of male valve 302 trapping pressure behind male valve 302.

This enables the safe positioning of an implement until its next use.

The gaps 132 and the passageway 127 are resistances and the volume 170 of

pressurized fluid is in effect a capacitance. When pressure is released from volume

171, the reduction of pressure in volume 170 is reduced over a period of time and the

decay of pressure in volume 170 is in effect somewhat analogous to the discharge of

voltage across a capacitor. The pressure differential across the valve lock shaft

shuttles the valve lock shaft leftwardly closing valve 302.

Fig. II is a cross-sectional view 1001 of the coupling wherein the uncoupling

process has proceeded further with the male 302 and female valves 124 in the closed

position. In Fig. II there is no pressure on the female portion of the coupling and the

male valve is closed with pressure trapped behind it. The coupling may now be pulled

apart by hand. Instead of being operated by hand the male and female halves of the invention can be adapted to coupling mechanically without the use of a person's hand

to provide the force necessary to vent, couple and decouple the coupling halves.

Figs 2-6B illustrate the second embodiment of the female half of the coupling.

The inner body 110 and the inner body adaptor 118 and components residing therein

are in effect a cartridge inserted within housing 280 or in the embodiment of Fig. 1

they are inserted within the manifold 101 and seal retainer 109. The elements of the

cartridge have the same structure and function as described above in connection with

Figs. 1-11.

In this embodiment, the female coupling half is rigidly mounted to an adaptor

262 by a threaded interconnection 287 between adaptor 262 and outer body 286.

Referring to Fig. 2, a vent passageway 270 is illustrated in housing 280 and leads to

passageway 260 which leads to vent annulus 297 formed by vent gland 293 threaded

294 to housing 280. Vent gland 293 is an elastomeric material. A vent 298 is

threadably connected to vent gland 293. Serrations 299 on the vent enable hose to be

better secured to the vent. Retaining ring 295 secures vent gland 293 to adaptor 262.

Referring to Fig. 2, adaptor 207 is threaded to outer body 286 and retainer

locking sleeve 108 against the force of spring 114.

Still referring to Fig. 2, seals 261 and 292 prevent leakage between housing 280

and adaptor 262. Seal 290 prevents leakage between end portion 291 of adaptor 262

and outer body 286.

Still referring to Fig. 2, annulus 282 is formed between housing 280 and outer

body 286. Annulus 282 communicates with a plurality of ports/apertures 281 in housing 280. Annulus 283 is formed between end portion 291 of adaptor 262 and

housing 280. A plurality of passageways 284 interconnect annulus 283 to bore 263 in

adaptor 262. Reference numeral 277 signifies a relief flow path for air residing in

volume 175 as previously discussed above in connection with the first embodiment. Fig. 2 is a cross-sectional view 200 of the second embodiment of the female

half of the coupling illustrated disconnected from the male half of the coupling. The

connected position (Fig. 3) of the inner body member 110 in relation to the housing

280 and the disconnected position (Fig. 2) of the inner body member 110 in relation to

the housing 280 are the same. Similarly, the connected position (Fig. 3) and the

disconnected (Fig. 2) position of the female valve 124 are the same.

Fig. 3 is a cross-sectional view 300 of the second embodiment of the female

half of the coupling illustrated connected (coupled) with the male half of the coupling.

Fig. 4 is a cross-sectional view 400 of the second embodiment of the female

half of the coupling illustrated with the male valve in the closed position and the

female valve partially open coupling half is being vented. Fig. 4A is an enlargement of

a portion of Fig. 4. Reference numeral 401 represents the vent flow path of the second

embodiment.

Fig. 4 illustrates the position of the valve lock shaft 122 and the position of the

inner body 110 (and inner body adaptor 118) moved rearwardly (leftwardly). Valve

121 is illustrated off seat 160 permitting the relief of pressure. Arrow 401 illustrates a

relief flow path to atmospheric pressure. Passageway 270 in housing 280 is indicated

in phantom. See Figs. 6 and 6A for other views illustrating passageway 270. Fig. 4A is an enlargement 400 A of a portion of Fig. 4 illustrating flow arrow 401 and flow

between dump valve stem 112 and valve lock shaft 122.

Fig. 5 is a cross-sectional view of the second embodiment of the female half of

the coupling illustrated with pressure being applied to the female half of the coupling

as indicated by reference numeral 501 to open valves 124 and 302.

Fig. 6 is a cross-sectional view of the housing 600 illustrating apertures 281,

passages 284 and vent passageway 270 in more detail. Fig. 6A is a left side view

600A of the housing 280 and Fig. 6B is a right side view 600B of the housing 280.

Fig. 7 is a schematic 700 representation of an application of the first

embodiment of the present invention. Power source 701 is typically a hydraulic pump

mounted on a tractor. Hydraulic fluid is pumped through a hydraulic line 711 to a

directional valve 702 where it is directed through shut off valves 703, 704 in one or

the other directions. Bidirectional arrows between the shut off valves and the

manifold 705 indicate that the directional valve may direct fluid to or from a specific

coupling mounted within the manifold 705. Bidirectional lines 706, 707 indicate that

the male coupling halves 708 may be connected and disconnected from the respective

female coupling halves whose cartridges are mounted in the manifold as illusfrated

and described in connection with Figs. 1-11 above. The load 710 may be run in either

direction as dictated by the directional valve 702. As stated previously it is desirable

to safely position the implement/load 710 by disconnecting the male coupling halves

708, 709 from the female coupling halves in the manifold 705 while retaining pressure

on the male coupling halves. Still referring to Fig. 7, lines 714 and 715 are vent lines from the manifold for the relief of pressure to reservoir 713 at atmospheric pressure.

Further, line 716 is a bypass line for directing fluid from the bidirectional valve 702 to

the reservoir. Line 712 is a return line (pump suction) line to the power source.

While the invention has been described herein by way of example and with

particularity, those skilled in the art will readily recognize that changes and

modifications may be made to the invention without departing from the spirit and

scope of the appended claims.

Claims

We claim:

1. A female coupling half for use with a male coupling half, said male

coupling half includes a male valve, said female coupling half comprising: a female

valve; a valve lock shaft affixed to said valve and movable therewith; a lock piston;

said valve lock shaft includes a recess; said lock piston includes a plurality of

apertures; a plurality of detents reside respectively in said plurality of apertures of said

lock piston; and, said detents interengaging said recess securing said male and female

valves in open position.

2. A female coupling half for use with a male coupling half as claimed in claim

1, said female half further comprising: a lock sleeve, and said lock sleeve restraining

said detents from radial movement.

3. A female coupling half for use with a male coupling half as claimed in claim

2, said female half further comprising: a sliding sleeve; and, a spring operable between

said lock sleeve and said sliding sleeve.

4. A female coupling half for use with a male coupling half as claimed in claim

3 wherein said valve lock shaft includes an exterior, a hollow inner core, and a

passageway interconnecting said exterior and said hollow inner core.

5. A female coupling half for use with a male coupling half as claimed in claim

4 wherein said female valve is affixed to said valve lock shaft by a threaded

interconnection.

6. A female coupling half for use with a male coupling half as claimed in claim

4 wherein said female valve includes an end portion and an opening for receiving said male valve member.

7. A female coupling half for use with a male coupling half as claimed in claim

6 wherein said end portion is flared.

8. A female coupling half for use with a male coupling half, said male

coupling half includes a male valve and a male body, said female coupling half

comprising: an outer body, a housing, and an inner body; said inner body slidingly

movable with respect to said housing between a first position and a relief position;

said housing residing partially within said outer body forming an annular passageway

therebetween; an inner body adaptor affixed to said inner body; a dump valve body

slidingly engageable within said inner body adaptor and movable with respect to said

inner body adaptor; a lock piston slidingly engageable within said inner body adaptor

and movable with respect to said inner body adaptor; a dump valve; said dump valve

being seated against said dump valve body; a valve lock shaft slidingly engageable

within said lock piston; a female valve; said female valve affixed to said valve lock

shaft and movable therewith between a first position and a relief position; said male

body engaging said inner body member and said male valve engaging said female

valve urging said inner body member and said female valve from said first positions to

said relief positions upon insertion of said male coupling half into said female

coupling half, and, said dump valve being movable with said inner body member and

said inner body adaptor actuating said dump valve relieving pressure within said

female coupler half.

9. A female coupling half for use with a male coupling half as claimed in claim 8 wherein said insertion of said male coupling half into said female coupling half is

performed by hand.

10. A female coupling half for use with a male coupling half as claimed in

claim 8 wherein a first spring resides between said dump valve and said lock valve

shaft and wherein a second spring resides between said dump valve body and said lock

piston.

11. A female coupling half for use with a male coupling half as claimed in

claim 8 further comprising a sliding sleeve slidingly engageable with said inner body

and said inner body adaptor and, a lock sleeve slidingly engageable with said sliding

sleeve and said lock piston.

12. A female coupling half for use with a male coupling half as claimed in

claim 8, said female coupling half further comprising an outer adaptor affixed to said

outer housing forming an annular passageway between said outer adaptor and said

housing.

13. A female coupling half for use with a male coupling half as claimed in

claim 12 wherein said housing includes a plurality of passageways therein.

14. A female coupling half for use with a male coupling half as claimed in

claim 8 further comprising a vent passageway in said housing.

15. A female coupling half for use with a male coupling half, said male

valve; a valve lock shaft having a circumferential recess therein; a lock piston; said

lock piston includes a plurality of circumferentially spaced apertures; a plurality of detents residing, respectively, in each of said circumferentially spaced apertures; a

lock sleeve forcibly restraining said detents in said recess of said valve lock shaft

when said male and female coupling halves are coupled together; and, said detents

removably residing in said circumferential recess of said valve lock shaft when said

male and female coupling halves are uncoupled.

16. A female coupling half for use with a male coupling half, said male

coupling half and said female coupling half being connected together and pressurized,

said male coupling half includes a male valve, said female coupling half comprising: a

female valve affixed to a valve lock shaft; said male and female valves being engaged

with each other; a piston chamber; a lock piston slidably movable within said piston

chamber; said valve lock shaft and said lock piston each being slidably movable each

with respect to each other; first and second seals preventing leakage between said

valve lock shaft and said lock piston; said valve lock shaft having an exterior and a

hollow interior, one end of said interior is closed by said female valve and the other

end of said interior is substantially occluded; a relief passageway in said valve lock

shaft interconnecting said hollow interior of said valve lock shaft and said exterior of

said valve lock shaft; said exterior of said valve lock shaft and said piston chamber

pressurized; and, said piston chamber subsequently vented followed by venting of said

hollow interior of said valve lock shaft followed by venting of said exterior of said

valve lock shaft.

17. A female coupling half for use with a male coupling half, said male

coupling half and said female coupling half being connected together and pressurized as claimed in claim 16, wherein said first seal is subjected to pressure in said piston

chamber and said second seal is subjected to pressure on said exterior of said valve

lock shaft, and wherein said venting of said piston chamber creates a differential

pressure across said valve lock shaft causing said valve lock shaft and said female

valve to move toward said piston chamber and said male valve to move to a closed

position while said male and female halves of the coupling are connected.

18. A female coupling half for use with a male coupling half as claimed in

claim 17 wherein said male valve of said male coupling closes with pressure on it.

19. A female coupling half for use with a male coupling half, said male

coupling half includes a male valve and a male body, said female coupling half

comprising: a female valve; a retainer for securing a seal; said female valve includes a

lip and a recess; said lip engages said seal when said coupling halves are disconnected;

and, during engagement of said coupling said male body engages said retainer

followed by said male valve engaging said recess and said lip of said female valve

such that said seal is spaced apart from said lip of said female valve partially opening

said female valve.

20. A female coupling half for use with a male coupling half as claimed in

claim 19 wherein said female coupling half is pressurized opening said male valve and

further opening said female valve.

21. A female coupling comprising a female half for use with a male coupling

half; said male coupling half includes a body and a male valve, said female coupling

half includes an inner body and a retainer; said inner body includes a detent carried in an aperture; said male body includes a circumferential recess therein; a locking sleeve

having a land; said male half and said female half being pressure locked together as

said circumferential recess and said locking sleeve engage said detent when said

coupling is pressurized; and, said male and female coupling halves being separable

and said detent being movable with respect to said recess and said land on said locking

sleeve when said coupling is not pressurized.

22. A coupling as claimed in claim 21 further comprising a plurality of detents

carried by said inner body member in a respective plurality of apertures.

23. A process for coupling a male coupling half and a female coupling half

together, said male coupling half includes a body and a male valve, said female

coupling half includes an inner body and a female valve, comprising the steps of: engaging said male body and said inner body of said female; engaging said male valve and said female valve; applying force to and urging said female valve and said inner body into the

bore of said female coupling half; venting said female coupling half; releasing the force applied to said female valve and said inner body; and, pressurizing said female half of said coupling opening said male and female valves.

24. A process for coupling a male coupling half and a female coupling half

together as claimed in claim 23 further comprising the steps of: locking said male and female valves in open position.

25. A process for uncoupling a male coupling half and a female coupling half,

said male coupling half having a male valve and said female coupling half having a

female valve, said valves in engagement with each other, said female coupling half

having a first chamber intercomiected to a second chamber by a passageway,

comprising the steps of: reducing the pressure in said first chamber; and, shuttling said male valve to its closed position.

26. A process for uncoupling a male coupling half and a female coupling half

as claimed in claim 25, further comprising the step of: pulling said coupling halves apart closing said female valves.