Title of Invention	"A SHUT-OFF DEVICE"
Abstract	A shut off mechanism manufactured of polymeric materials for a tap, cock or faucet comprising an axially rotatable spindle 11 supported within a casing 20 that screws onto the tap, cock or faucet body. The spindle is in threaded engagement with a carriage 30 that supports a sealing member 40 so that rotation of the spindle causes linear displacement of the carriage and sealing member to shut off the flow of fluid. The sealing member 40 is replaceable and is a press fit onto the end of the carriage 30. A cap member 37 engages and locates an O-ring 36 between the spindle 11 and casing 20.

Title of Invention

"A SHUT-OFF DEVICE"

Abstract

A shut off mechanism manufactured of polymeric materials for a tap, cock or faucet comprising an axially rotatable spindle 11 supported within a casing 20 that screws onto the tap, cock or faucet body. The spindle is in threaded engagement with a carriage 30 that supports a sealing member 40 so that rotation of the spindle causes linear displacement of the carriage and sealing member to shut off the flow of fluid. The sealing member 40 is replaceable and is a press fit onto the end of the carriage 30. A cap member 37 engages and locates an O-ring 36 between the spindle 11 and casing 20.

Full Text	This invention relates to a shut-off device for a tap, cock or faucet. Discussion of the Prior Art There are a number of types of cocks, taps and faucets that include a valve member and associated seal to control flow of fluids that may be liquid or gases. The complexity of such valve mechanisms vary enormously but there is always a need for a simple hard wearing shut-off mechanism with replaceable sealing components. It is these considerations that have brought about the present invention. Summary of the Invention According to the present invention there is provided a shut-off mechanism for a tap, cock or faucet comprising an axially rotatable spindle supported within a casing adapted to be attached to a body of the tap cock or faucet, a sealing member displaceable on rotation of the spindle to engage an associated seat in the tap cock or faucet body, an O-ring being positioned between the spindle and the casing. The sealing member being furnished on one end of a carriage that is in threadetd engagement with the spindle whereby rotation of the spindle imparts linear displacement to the carriage, characterised in that the sealing member is replaceable and is a press fit onto the end of the carriage, and the cap member engages and locates the O-ring between the spindle and casing. . Therefore, the present invention provides for a shut-off device for a tap, cock or faucet, comprising an axially rotatable spindle (11) supported within a casing (20) attached to a body of the tap, cock or faucet, a sealing member (40) displaceable on rotation of the spindle to engage an associated seat in the tap, cock or faucet body, an O-ring (36) positioned between a shoulder (14) on the spindle (11) and the casing (20), the sealing member being replaceable and a press fit onto one end of the carriage (30) that is in threaded engagement with the spindle (11) whereby rotation of the spindle (11) imparts linear displacement to the carriage (30) , characterized in that a replaceable end bonnet member (37) is located on a step (16) of the spindle (11) wholly within the casing (20) to locate the O-ring (36) between the spindle (11) and casing (20). BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING An embodiment of the present invention will now be described by way of example only with reference to the accompanying drawing which is a cross-sectional view of a shut-off mechanism for a valve assembly. Description of the Preferred Embodiment The accompanying drawing is a cross-sectional view of a shut-off mechanism 10 for a valve assembly. The mechanism is adapted to be attached to a variety of types of cocks or faucets such as a bib cock, a stop cock or a pillar cock more usually known as a basin tap. The shut-off mechanism can also be used with other types of taps such as mixer taps. The shut-off mechanism 10 cuts off and controls flow of fluids usually liquids. The mechanism includes a displaceable valve member that is adapted to seat against a valve seat not shown to cut off flow of fluid. As shown in the drawing, the mechanism 10 essentially comprises an axially rotatable spindle 11 that is coupled to a handle 12, the spindle being rotatable within a casing 20 which is adapted to be threadedly secured to the body of the tap or cock not shown. The spindle 11 threadedly engages a carriage 30 that in turn carries a sealing member 40. The arrangement is such as that rotation of a handle 12 causes rotation of the spindle 11 to displace the carriage 30 longitudinally of the spindle 11 to force the sealing member 31 against a seat not shown to effect the shut-off mechanism. Reverse rotation of the handle draws the sealing member 40 back to the position shown in the drawing and clear of the seat to open the valve assembly and allow flow of fluid. The components of the shut-off mechanism 10 are preferably constructed in polymeric materials and particularly high grade engineering polymers that have proven characteristics of durability and reliability. The casing or bonnet 20 is a cylindrical body with a stepped internal bore 21 terminating in a neck portion 22 at one end and being externally threaded at the other lower end 23. The external threading is suitable to allow the casing 20 to be screwed into the body of a valve or tap not shown. The casing 20 has a hexagonal outer ring 24 to facilitate location by means of a spanner. A cylindrical spindle 11 is located coaxially within the casing 20 to be axially rotatable within the casing. The spindle is a substantially hollow member having an externally threaded forward end 13 which merges into a shoulder 14 and stepped shank 15. The step 16 on the shank 15 is of greater diameter than the aperture in the neck 22 of the casing 20 to prevent displacement of the spindle 11 out of the casing 20. The upper end of the spindle 11 is arranged to be a sealed rotational fit within the bore of the carriage by the provision of an O-ring 36 that sits against the shoulder 14 on the spindle and is located in position by a cap member 37 that locates on the step 16 with a downwardly projecting annular flange 38 that is a force fit onto the shank of the spindle 11. The cap member 37 locates the CD-ring 36 in position and acts as a thrust and wear plate for the mechanism. Since the components of the shut-off mechanism are moulded in polymeric materials, it is important that there is no parting line adjacent the O-ring 36 to reduce the quality of that seal. The use of the cap member 37 ensures that the spindle can be moulded in plastics with the parting line terminating at the shoulder 14. The shoulder 14 and cap 37 act as the means of locating the O-ring 36 which engages the smooth wall of the spindle above the shoulder 14. The upper end of the shank 15 is internally threaded 17 to take a small screw 18 which is countersunk into an end boss 19 of the tap handle 12. A removable cap 9 seals the cavity that houses the screw 8. The underside of the handle 12 is adjacent the top of the casing 20 thus ensuring that the spindle is free to rotate axially but constrained against longitudinal displacement relative to the casing. The externally threaded lower end 13 of the spindle 11 threadedly engages an internally threaded bore 31 on the carriage 30. The carriage is arranged to be a sliding fit within the bore of the casing 20. The internally threaded bore 31 terminates in a closed end 32 that has a forwardly projecting head 33 of mushroom configuration. The head 33 of mushroom configuration is arranged to be a snap fit within a suitably profiled recess 41 in the sealing member 40 which has a diameter that corresponds to the diameter of the carriage 30. The sealing member 40 is also provided with a forwardly projecting closed end 42. The sealing member 40 and its engagement with the mushroom head 33 of the carriage 30 ensures positive and effective location with the additional feature of simple replaceability. Clockwise motion of the handle 12 causes the spindle 11 to rotate which in turn through its threaded engagement with the carriage 30 forces the carriage downwards so that the sealing member 40 closes off the valve. Conse It is understood that there are a variety of polymers or plastics that can be used to produce the shut-off mechanism described above. It is however envisaged that the casing 20, spindle 11 and carriage 30 would be made of acetal whilst the cap member 37 is more likely to be constructed of nylon. The sealing member 40 would be a polyester elastomer. The handle 12 is likely to be made of a non-corrosive metal such as brass. The assembly described above is simple in its operation and designed for a long and trouble-free life. Should the seals perished or break down, it is a simple matter to remove the casing 20, peel off and replace the sealing member 40 and replace O-ring seal 36 on the spindle 11. WE CLAIM: 1. A shut-off device for a tap, cock or faucet, comprising an axially rotatable spindle (11) supported within a casing (20) attached to a body of the tap, cock or faucet, a sealing member (40) displaceable on rotation of the spindle to engage an associated seat in the tap, cock or faucet body, an O-ring (36) positioned between a shoulder (14) on the spindle (11) and the casing (20), the sealing member being replaceable and a press fit onto one end of the carriage (30) that is in threaded engagement with the spindle (11) whereby rotation of the spindle (11) imparts linear displacement to the carriage (30), characterized in that a replaceable end bonnet member (37) is located on a step (16) of the spindle (11) wholly within the casing (20) to locate the O-ring (36) between the spindle (11) and casing (20). 2. A shut-off device as claimed in claim 1, wherein the end of the said carriage (30) has a bulbous projection (31) to be a force fit within a corresponding recess (41) formed in the sealing member (40). 3. A shut-off device as claimed in claim 1 or 2, wherein the said carriage (30) is non-rotationally supported within the said casing (20) to be axially displaceable therein. 4. A shut-off device as claimed in any one of the preceding claims, wherein the said spindle (11) has an externally threaded end (13) that threadedly engages an internally threaded bore (31) of the carriage (30). 5. A shut-off device substantially as herein described with reference to and as illustrated in the accompanying drawings.

Full Text

This invention relates to a shut-off device for a tap, cock or faucet.
Discussion of the Prior Art
There are a number of types of cocks, taps and faucets that include a valve member and associated seal to control flow of fluids that may be liquid or gases. The complexity of such valve mechanisms vary enormously but there is always a need for a simple hard wearing shut-off mechanism with replaceable sealing components. It is these considerations that have brought about the present invention. Summary of the Invention
According to the present invention there is provided a shut-off mechanism for a tap, cock or faucet comprising an axially rotatable spindle supported within a casing adapted to be attached to a body of the tap cock or faucet, a sealing member displaceable on rotation of the spindle to engage an associated seat in the tap cock or faucet body, an O-ring being positioned between the spindle and the casing. The sealing member being furnished on one end of a carriage that is in threadetd engagement with the spindle whereby rotation of the spindle imparts linear displacement to the carriage, characterised in that the sealing member is replaceable and is a press fit onto the end of the carriage, and the cap member engages and locates the O-ring between the spindle and casing. .
Therefore, the present invention provides for a shut-off device for a tap, cock or faucet, comprising an axially rotatable spindle (11) supported within a casing (20) attached to a body of the tap, cock or faucet, a sealing member (40) displaceable on rotation of the spindle to engage an associated seat in the tap, cock or faucet body, an O-ring
(36) positioned between a shoulder (14) on the spindle (11)
and the casing (20), the sealing member being replaceable and
a press fit onto one end of the carriage (30) that is in
threaded engagement with the spindle (11) whereby rotation of
the spindle (11) imparts linear displacement to the carriage
(30) , characterized in that a replaceable end bonnet member
(37) is located on a step (16) of the spindle (11) wholly
within the casing (20) to locate the O-ring (36) between the
spindle (11) and casing (20).
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
An embodiment of the present invention will now be described by way of example only with reference to the accompanying drawing which is a cross-sectional view of a shut-off mechanism for a valve assembly.
Description of the Preferred Embodiment
The accompanying drawing is a cross-sectional view of a shut-off mechanism 10 for a valve assembly. The mechanism is adapted to be attached to a variety of types of cocks or faucets such as a bib cock, a stop cock or a pillar cock more usually known as a basin tap. The shut-off mechanism can also be used with other types of taps such as mixer taps. The shut-off mechanism 10 cuts off and controls flow of fluids usually liquids. The mechanism includes a displaceable valve member that is adapted to seat against a valve seat not shown to cut off flow of fluid.
As shown in the drawing, the mechanism 10 essentially comprises an axially rotatable spindle 11 that is coupled to a handle 12, the spindle being rotatable within a casing 20 which is adapted to be threadedly secured to the body of the tap or cock not shown. The spindle 11 threadedly engages a carriage 30 that in turn carries a sealing member 40. The arrangement is such as that rotation of a handle 12 causes rotation of the spindle 11 to displace the carriage 30 longitudinally of the spindle 11 to force the sealing member 31 against a seat not shown to effect the shut-off mechanism. Reverse rotation of the handle draws the sealing member 40 back to the position shown in the drawing and clear of the seat to open the valve assembly and allow flow of fluid.
The components of the shut-off mechanism 10 are preferably constructed in polymeric materials and particularly high grade engineering polymers that have proven characteristics of durability and reliability. The casing or bonnet 20 is a cylindrical body with a stepped internal bore 21 terminating in a neck portion 22 at one end and being externally threaded at the other lower end 23. The external threading is suitable to allow the casing 20 to be screwed into the body of a valve or tap not shown. The casing 20 has a hexagonal outer ring 24 to facilitate
location by means of a spanner. A cylindrical spindle 11 is located coaxially within the casing 20 to be axially rotatable within the casing. The spindle is a substantially hollow member having an externally threaded forward end 13 which merges into a shoulder 14 and stepped shank 15. The step 16 on the shank 15 is of greater diameter than the aperture in the neck 22 of the casing 20 to prevent displacement of the spindle 11 out of the casing 20.
The upper end of the spindle 11 is arranged to be a sealed rotational fit within the bore of the carriage by the provision of an O-ring 36 that sits against the shoulder 14 on the spindle and is located in position by a cap member 37 that locates on the step 16 with a downwardly projecting annular flange 38 that is a force fit onto the shank of the spindle 11. The cap member 37 locates the CD-ring 36 in position and acts as a thrust and wear plate for the mechanism. Since the components of the shut-off mechanism are moulded in polymeric materials, it is important that there is no parting line adjacent the O-ring 36 to reduce the quality of that seal. The use of the cap member 37 ensures that the spindle can be moulded in plastics with the parting line terminating at the shoulder 14. The shoulder 14 and cap 37 act as the means of locating the O-ring 36 which engages the smooth wall of the spindle above the shoulder 14.
The upper end of the shank 15 is internally threaded 17 to take a small screw 18 which is countersunk into an end boss 19 of the tap handle 12. A removable cap 9 seals the cavity that houses the screw 8. The underside of the handle 12 is adjacent the top of the casing 20 thus ensuring that the spindle is free to rotate axially but constrained against longitudinal displacement relative to the casing.
The externally threaded lower end 13 of the spindle 11 threadedly engages an internally threaded bore
31 on the carriage 30. The carriage is arranged to be a sliding fit within the bore of the casing 20. The internally threaded bore 31 terminates in a closed end 32 that has a forwardly projecting head 33 of mushroom configuration. The head 33 of mushroom configuration is arranged to be a snap fit within a suitably profiled recess 41 in the sealing member 40 which has a diameter that corresponds to the diameter of the carriage 30. The sealing member 40 is also provided with a forwardly projecting closed end 42. The sealing member 40 and its engagement with the mushroom head 33 of the carriage 30 ensures positive and effective location with the additional feature of simple replaceability. Clockwise motion of the handle 12 causes the spindle 11 to rotate which in turn through its threaded engagement with the carriage 30 forces the carriage downwards so that the sealing member 40 closes off the valve. Conse It is understood that there are a variety of polymers or plastics that can be used to produce the shut-off mechanism described above. It is however envisaged that the casing 20, spindle 11 and carriage 30 would be made of acetal whilst the cap member 37 is more likely to be constructed of nylon. The sealing member 40 would be a polyester elastomer. The handle 12 is likely to be made of a non-corrosive metal such as brass.
The assembly described above is simple in its operation and designed for a long and trouble-free life. Should the seals perished or break down, it is a simple
matter to remove the casing 20, peel off and replace the sealing member 40 and replace O-ring seal 36 on the spindle 11.

WE CLAIM:
1. A shut-off device for a tap, cock or faucet, comprising an axially rotatable spindle (11) supported within a casing (20) attached to a body of the tap, cock or faucet, a sealing member (40) displaceable on rotation of the spindle to engage an associated seat in the tap, cock or faucet body, an O-ring (36) positioned between a shoulder (14) on the spindle (11) and the casing (20), the sealing member being replaceable and a press fit onto one end of the carriage (30) that is in threaded engagement with the spindle (11) whereby rotation of the spindle (11) imparts linear displacement to the carriage (30), characterized in that a replaceable end bonnet member (37) is located on a step (16) of the spindle (11) wholly within the casing (20) to locate the O-ring (36) between the spindle (11) and casing (20).
2. A shut-off device as claimed in claim 1, wherein the end of the said carriage (30) has a bulbous projection (31) to be a force fit within a corresponding recess (41) formed in the sealing member (40).
3. A shut-off device as claimed in claim 1 or 2, wherein the said carriage (30) is non-rotationally supported within the said casing (20) to be axially displaceable therein.
4. A shut-off device as claimed in any one of the preceding claims, wherein the said spindle (11) has an externally threaded end (13) that threadedly engages an internally threaded bore (31) of the carriage (30).
5. A shut-off device substantially as herein described with reference to and as illustrated in the accompanying drawings.

Documents:

1026-del-1995-abstract.pdf

1026-del-1995-claims.pdf

1026-DEL-1995-Correspondence Others-(22-03-2011).pdf

1026-del-1995-correspondence-others.pdf

1026-del-1995-correspondence-po.pdf

1026-del-1995-description (complete).pdf

1026-del-1995-drawings.pdf

1026-del-1995-form-1.pdf

1026-del-1995-form-13.pdf

1026-del-1995-form-2.pdf

1026-DEL-1995-Form-27-(22-03-2011).pdf

1026-del-1995-form-3.pdf

1026-del-1995-form-4.pdf

1026-del-1995-form-6.pdf

1026-del-1995-form-9.pdf

1026-del-1995-gpa.pdf

1026-del-1995-petition-others.pdf

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Patent Number

191455

Indian Patent Application Number

1026/DEL/1995

PG Journal Number

49/2003

Publication Date

06-Dec-2003

Grant Date

30-Jul-2004

Date of Filing

05-Jun-1995

Name of Patentee

HAN SIN LOW

Applicant Address

C/O WATERTEC (MALAYSIA)SDN BHD, OF LOT 6, JALAN HALBA 16/16, 40000 SHAH ALAM, SELANGOR DARUL EHSAN, MALAYSIA

Inventors:

#	Inventor's Name	Inventor's Address
1	HAN SIN LOW	C/O WATERTEC (MALAYSIA)SDN BHD, OF LOT 6, JALAN HALBA 16/16, 40000 SHAH ALAM, SELANGOR DARUL EHSAN, MALAYSIA

PCT International Classification Number

F16K 25/00

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	PI 6403472	1994-12-22	Malaysia