GB2461139A

GB2461139A - A pull-out spray head for a kitchen sink faucet

Info

Publication number: GB2461139A
Application number: GB0905639A
Authority: GB
Inventors: Josesph Li
Original assignee: Globe Union Industrial Corp
Current assignee: Globe Union Industrial Corp
Priority date: 2009-04-01
Filing date: 2009-04-01
Publication date: 2009-12-30
Anticipated expiration: 2029-04-01
Also published as: GB2461139B; GB0905639D0

Abstract

A pull-out spray head comprises an inlet 22c, a hose connected to the inlet and at least one flute 22e through which water can enter the spray head, the spray head further having a manually operated switch 50 to operate the flow through it, the switch operating a valve in the form of an rotationally-fixed but slidable inner pipe 30 having a seal 314 which engages an inner portion 22f of the shower head, wherein in the off position (figure 4) the inner pipe 30 sits at a position to prevent water flow through the circumferential flute, and in the on position (figure 5) water flows through the hose, then through the circumferential flute, through the inner pipe and out of the spray head outlet 24. Preferably the internal pipe is spring 40 biased. Ideally the spray head can be pulled out / detached from a faucet of a kitchen sink.

Description

PULLOUT SPRAY HEAD

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a faucet, and more particularly to a pullout spray head which can be connected to a hose and pulled out of the faucet when in use.

Description of the Prior Art

The kitchen faucet, especially the faucet disposed above the sink has been developed into a pullout type faucet in order to supply water to anyplace of the sink for easy cleaning and to prevent spilling of water. By connecting with a hose disposed in a housing of the faucet, the spray head is received in the housing of the faucet in normal condition, and when necessary, it can also be pulled out of the faucet for easy cleanup. The aforementioned pullout faucet has been disclosed in many patents, it is to be noted that the existing single outlet pullout faucet has been widely used. As shown in Fig. 1, the spray head 10 includes a threaded end 11 for threaded connection with a hose (not shown), and in this threaded end 11 is further disposed an anti-siphon device 12 in the form of a check valve. When the faucet is turned on, water flows through the hose to the spray head 10, meanwhile, the water pressure pushes the valve plug 121 to move and compresses the return spring 122 of the anti-siphon device 12 to form an opening (not shown), so that water can flow out of the faucet through the opening of the anti-siphon device 12, the inner passage 13 and a filter 14.

Such pullout spray head 10 has the following disadvantages: first, the pullout spray head 10 doesn't have its own outlet control valve and totally depends on the outlet valve of the faucet. For example, when the spray head 10 is switched on but not pulled out, at this moment, pulling out the spray head 10 without turning it off will cause water to splash out. In addition, when a user holds the spray head 10, he/she can't turn off the valve of the faucet with the hand which holds the spray head, but has to turn off it with the other hand. Or, the user has to push the spray head 10 back into the faucet then turn off the faucet valve. Neither way is convenient. Second, the anti-siphon device 12 of the spray head 10 can only live up to a low anti-siphon standard because to make sure that the anti-siphon device 12 can still be opened at a low water pressure, the elastic force of the return spring 122 should be limited, which is likely to result in a siphon effect when the spray head 10 is placed in the water of the sink and when a relatively large pressure is produced in the supply end of the water resource, so that dirty water will be sucked into the spray head 10, causing water pollution. Hence, how to solve the problem of the existing pullout spray head 10 and improve its anti-siphon function, there is still much room to improve.

The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide a pullout spray head with an improved anti-siphon effect.

Another objective of the present invention is to provide a pullout spray head which is simply structured and easy to use.

Yet another objective of the present invention is to provide a pullout spray head which is convenient to operate while having an improved anti-siphon function.

To achieve the above objectives, a pullout spray head of the preset invention comprises: a water supply device including an inlet space, an outlet space defined at an upper and a lower ends thereof, respectively, and an inner chamber defined between the inlet space and the outlet space, the inlet space being upward connected to a hose and downward connected to an upper portion of an inner surface of the inner chamber via at least one circumferential flute, the outlet space being connected to a lower portion of the inner chamber, a first sealing portion disposed between an upper end of the inner surface of the inner chamber and the lower end of the circumferential flute, a slot being axially defined in the inner surface of the inner chamber of water supply device; an inner pipe non-rotatably disposed in the inner chamber of the water supply device and including an upper end, a lower end and an inner passage defined therebetween, on an upper end of the inner pipe being defined at least one water inlet gap, on an outer surface of the inner pipe below the water inlet gap being disposed a second sealing portion, a first and a second sealing structures being slidably and sealingly disposed between the outer surface of the inner pipe and the inner surface of the inner chamber, the first sealing structure being located between the slot and the circumferential flute, the second sealing structure being located between the slot and the lower end of the inner pipe, wherein the inner pipe, in normal condition, is pushed toward the upper end of the inner chamber by an elastic force, making the first and the second sealing portions press against each other to create a sealing effect, so that water that comes from the inlet space of the water supply device and flows into the inner chamber via the circumferential flute is stopped between the first sealing structure and the first and second sealing portions, thus creating an anti-siphon effect, when the inner pipe is pushed toward a lower end of the inner chamber, the first and the second sealing portions will disengage from each other to turn into an open state, so that the water that comes from the inlet space of the water supply device and flows into the inner chamber via the circumferential flute is able to flow to the water inlet gap via the first and the second sealing portions and finally flow to the outlet space via the inner passage of the inner pipe, and thus the water flows out of the spray head; and a manually operated switch assembled on the water supply device and connected to the inner pipe via the slot, wherein the manually operated switch can be pushed to move downward so as to move the inner pipe toward the lower end of the inner chamber, thus allowing the water to flow or turning off the anti-siphon effect, when a pushing force acted on the manually operated switch is released, the manually operated switch will be pushed by the elastic force to move back to its original position along the inner pipe.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a side view of a conventional spray head; Fig. 2 is an assembly view of a spray head in accordance with the present invention and an outlet of a faucet; Fig. 3 is an exploded view of the spray head in accordance with the present invention; Fig. 4 is a cross sectional view of the spray head in accordance with the present invention without showing a ferrule; Fig. 5 is a cross sectional view showing the spray head in accordance with the present invention disposed at the outlet of the faucet; Fig. 6 is a cross sectional view of a water supply device in accordance with the present invention; Fig. 7 is a perspective view of a housing of the water supply device in accordance with the present invention; Fig. 8 is an axial perspective view of a water inlet member in accordance with the present invention; Fig. 9 is a radial perspective view of the water inlet member in accordance with the present invention; Fig. 10 is an axial perspective view of a water outlet member in accordance with the present invention; Fig. 11 is a cross sectional view of an inner pipe in accordance with the present invention; Fig. 12 is a perspective view of a manually operated switch in accordance with the present invention; Fig. 13 shows that the spray head in accordance with the present invention is disposed at the outlet of the faucet and is turned on; and Fig. 14 shows that the spray head is pulled out of the faucet and is turned on by pushing down the manually operated switch.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention will be clearer from the following description when viewed together with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment in accordance with the present invention.

Referring to Fig. 2, a pullout spray head 1 in accordance with a preferred embodiment of the present invention is approximately installed in conventional way, that is, on a faucet (not shown) above a sink and can be screwed with a hose inside the faucet. A user can hold the spray head 1 and pull it out of the outlet 2 of the faucet together with the hose to any desired position in the sink.

Referring then to Figs. 2-5, the pullout spray head 1 in accordance with the present invention essentially comprises a water supply device 20, an inner pipe 30, a return pring 40, a manually operated switch 50, a linkage 60, a ferrule 70 and a filter 80.

The water supply device 20, as shown in Fig. 6, is defined with an inner chamber 201 and comprises: a housing 21, a water inlet member 22, a middle member 23 and a water outlet member 24.

The housing 21, as shown in Fig. 7, is approximately cylindrical-shaped and includes an inner space 21a, a top opening 21b and a lower opening 21c. Around the periphery of the upper opening 21 b is defined a flange 211 on which are defined a pair of symmetrically arranged locking notches 212 and a gap 213. In the middle of the outer surface of the housing 21 is defined a longitudinal hole 214, and an annular protrusion 215 is arranged on the outer surface of the housing 21 around the longitudinal hole 214 to define a restriction groove 216. On the lower inner surface of the inner space 21a of the housing 21 is defined an inner thread 217.

The water inlet member 22, as shown in Figs. 8 and 9, includes a peripheral wall 22a and a choke portion 22b located in and connected to the periphery wall 22a.

A part of the peripheral wall 22a above the choke portion 22b defines an inlet space 22c inside the water inlet member 22, and a part of the peripheral wall 22a below the choke portion 22b defines an upper inner compartment 22d which constitutes the upper portion of the inner chamber 201. Six through circumferential flutes 22e penetrating from the upper surface to the lower surface of the choke portion 22b are defined on the periphery of the choke portion 22b and in communication with the upper inner compartment 22d. On the inner surface of the choke portion 22b is formed an annular flange 22f which is located between the upper end of the inner compartment 22d and the lower end of the circumferential flutes 22e. Plural guiding slots 22g are axially formed in the inner surface of the choke portion 22b and located above the annular flange 22f, and an annular sealing washer 22h is slideably disposed on the inner surface of the water inlet member 22 below the circumferential flutes 22e. The top portion of the outer surface of the peripheral wall 22a of the water inlet member 22 is provided with an outer thread 22i and below which is disposed an annular sealing washer 22j. On the outer surface of the peripheral wall 22a of the water inlet member 22 below the annular sealing washer 22j are formed two symmetrical upper locking blocks 22k, two symmetrical lower locking blocks 22m, an upper annular rib 22n and a lower annular rib 22p. The water inlet member 22 can be pushed up into the inner space 21a of the housing 21 via the lower opening 21c thereof in such a manner that the upper end of the water inlet member 22 protrudes out of the housing 21 for enabling the outer thread 22i to be used to screw with hose, and the lower locking blocks 22m are engaged in the locking notches 212 of the flange 211 of the housing 21 so as to prevent the water inlet member 22 from rotation. Meanwhile, the annular ribs 22n and 22p abut against the inner surface of the housing 21, so as to axially restrict the water inlet member 22 in the inner space 21 a of the housing 21 and prevent it from wobbling. Each of the upper and lower annular ribs 22n, 22p is (correspondingly in position) defined with a gap 22q, and around the lower edge of the peripheral wall 22a of the water inlet member 22 are symmetrically defined four locking notches 22r.

The middle member 23 is approximately cylindrical-shaped and has a peripheral wall 231 which defines a middle inner compartment 232 which constitutes a middle portion of the inner chamber 201. At the upper and lower ends of the outer surface of the peripheral wall are formed an upper flange 233 and a lower flange 234, respectively. Around the periphery of the upper flange 233 are symmetrically defined four locking blocks 235 which are to be engaged in the locking notches 22r of the water inlet member 22, so that the upper end of the peripheral wall 231 can clamp the annular sealing washer 22h to position it. The peripheral wall 231 is defined with a slot 236 extending upward from the lower flange 234.

The water outlet member 24, as shown in Fig. 10, includes a peripheral wall 241 and a dividing portion 242 jointed to the peripheral wall 241. The part of the peripheral wall 241 above the dividing portion 242 defines a lower inner compartment 243 which constitutes a lower part of the inner chamber 201, and the part of the peripheral wall 241 above the dividing portion 242 defines an outlet space 244. The dividing portion 242 is axially defined with plural holes 245. On the outer surface of the peripheral wall 241 are formed plural ribs 246, and the upper ends of the ribs 246 define an annular positioning groove 247 for receiving and positioning the lower flange 234 of the middle member 23. On the lower portion of the outer surface of the peripheral wall 241 is defined an outer thread 248 to be screwed with the inner thread 217 in the inner space 21 a of the housing 21.

The inner pipe 30, as shown in Fig. 11, is non-rotatably disposed in the inner chamber 201 of the water supply device 20 and includes a peripheral wall 31 and an inner passage 311 defined by the peripheral wall 31. Four symmetrical guiding portions 312 extend upward from the upper end of the peripheral wall 31 and are to be movably restricted in the guiding slots 22g of the upper inner compartment 22d of the water inlet member 22 of the water supply device 20. Each two neighboring guiding portions 312 define a water inlet gap 313 therebetween, which is in communication with the inner passage 311. An annular sealing washer 314 is disposed on the outer surface of the peripheral wall 31 under the guiding portions 312 and serves to appropriately press against the annular flange 22f around the inner surface of the upper inner compartment 22d of the water inlet member 22 to create a sealing effect, so that the water that comes from the inlet space 22c of the water inlet member 22 and flows into the upper inner compartment 22d of the water inlet member 22 via the circumferential flutes 22e will be prevented from flowing into the water inlet gaps 313 of the inner pipe 30. The annular sealing washer 314 can also move downward a little into an open state by disengaging from the annular flange 22f and abut against the annular sealing washer 22h under the annular flange 22f, so that the water that comes from the inlet space 22c of the water inlet member 22 and flows into the upper inner compartment 22d of the water inlet member 22 via the circumferential flutes 22e can flow through the water inlet gaps 313 and the inner passage 311 of the inner pipe 30 and finally flow out of the outlet space 244 of the water outlet member 24. The annular sealing washer 22h is slideably in sealing contact with the peripheral wall 31 of the inner pipe, fonning a first sealing structure.

Close to the lower end of the outer surface of the peripheral wall 31 of the inner pipe is disposed an annular sealing washer 315 which is slidably in sealing contact with the inner surface of the lower inner compartment 243 of the water outlet member 24, forming a second sealing structure which cooperates with the first sealing structure to eliminate leakage by preventing water from flowing into the inner chamber 201.

The peripheral wall 31 of the inner pipe 30 is formed on its outer surface between the first and the second sealing structures with a protrusion 316 which protrudes outward from the slot 236 of the middle member 23 and is located opposite the longitudinal hole 214 of the housing 21. The protrusion 316 can be pushed to move the inner pipe 30 toward the lower end of the inner chamber 201 of the water supply device 20, further, the protrusion 316 can also be moved up and down within the slot 236.

The return spring 40 is biased between the lower end of the inner pipe 30 and the top surface of the dividing portion 242 of the water outlet member 24 to keep pushing the inner pipe 30 toward the upper end of the inner chamber 201 of the water supply device 20 so as to make the annular sealing washer 314 of the inner pipe press against the annular flange 22f of the water inlet member 22 to create a sealing effect. The returning spring 40 can also be compressed by downward displacement of the inner pipe 30, and when the force causing the downward displacement of the inner pipe 30 disappears, the returning spring 40 will be restored and will push the inner pipe 30 back to its original position.

The manually operated switch 50, as shown in Fig. 12, comprises a press portion 51 and a connecting portion 52 extending inward from the press portion 51.

The press portion 51 can be positioned in the restriction groove 216 of the housing 21. The connecting portion 52 inserts inward from the longitudinal slot 214 of the housing 21, and the inward end of the connecting portion 52 is defined with an inserting hole 521 at both sides of which being arranged two opposite elastic retaining pieces 522 which are to be engaged with the protrusion 316 of the inner pipe 30 when the inner pipe 30 is inserted in the inserting hole 521.

The linkage 60 is an elongated arc-shaped piece with a fixed end 61 and a movable end 62. The fixed end 61 of this embodiment is defined with a through hole 611 to be engaged with the connecting portion 52 of the manually operated switch 50, so as to make the linkage 60 to move together with the manually operated switch 50. The movable end 62 can protruded upwards out of the gap 213 of the housing 21 and can be pressed properly to move downward, or move back into the gap 213 of the housing 21 when the manually operated switch 50 is pressed downwards.

The ferrule 70 can be fixed at the outlet 2 of the faucet and is provided at its lower end with an annular flange 71. Before the spray head 1 is pulled out of the faucet, the movable end 62 of the linkage 60 is pressed into the housing by the annular flange 71 of the ferrule 70, as shown in Fig. 5, causing the downward movement of the manually operated switch 50 and the inner pipe 30, so that the annular sealing washer 314 at the upper portion of the inner pipe can move downward into an open state by disengaging from the annular flange 22f and abut against the annular sealing washer 22h under the annular flange 22f. The ferrule 70 is axially further provided with two guiding slots 72 extending upward from the annular flange 71, and two locking slots 73 formed in radial direction of the ferrule and in communication with the upper end of the respective guiding slots 72, so that after being guided in the guiding slots 72, the upper locking blocks 22k of the water inlet member 22 can be engaged in the locking slots 73 by rotating the water inlet member 22. In this way, the water supply device 20 is restricted from axial displacement and stably fixed at the outlet 2 of the faucet. Meanwhile, the linkage 60, in normal condition, is pressed by the annular flange 71 of the ferrule 70 into a retracted position.

The filter 80 is screwed in the outlet space 244 of the water outlet member 24 for filtering the water passing therethrough.

Referring then to Figs. 3 and 4, in normal condition, the spray head 1 can be assembled at the outlet 2 of the faucet. In assembly, the user only needs to align the upper locking blocks 22k of the water inlet member 22 with the guiding slots 72 of the ferrule 70, and then push the upper locking blocks 22k to the upper end of the guiding slots 72, finally rotate the water inlet member 22 to make the upper locking blocks 22k engage in the locking slots 73, in this way, the spray head is fixed, as shown in Figs. 2 and 5. At this moment, the movable end 62 of the linkage 60 on the spray head 1 is pressed by the annular flange 71 of the ferrule 70 into a retracted position, so that the inner pipe 30 can be moved to the lower end of the inner chamber 201 of the water supply device 20, and the annular sealing washer 314 can move downward into an open state by disengaging from the annular flange 22f and abut against the annular sealing washer 22h under the annular flange 22f. As a result, the water coming from the hose can flow through the inlet space 22c and the circumferential flutes 22e of the water inlet member 22 into the inner chamber 201, then through the water inlet gaps 313 and the inner passage 311 of the inner pipe 30 and finally flow out of the holes 245 and the outlet space 244 of the water outlet member 24, as shown in Fig. 13. The present invention is easy to use since it can be operated in the same way as a conventional faucet.

Referring then to Figs. 2, 3 and 5, the spray head of the present invention can also be pulled out of the outlet 2 of the faucet together with the hose to any desired position in the sink. To do this, the user can hold the spray head 1 and rotate it toward a predetermined direction of the locking slots 73 to the upper end of the guiding slots 72, and then pull the spray head 1 downward to disengage it out of the faucet. At the instant of disengagement, since the pressing force acted on the movable end 62 of the linkage 60 of the spray head 1 has disappeared, the return spring 40 at the lower end of the inner pipe 30 will push the inner pipe upward to the upper end of the inner chamber 201 of the water supply device 20, so as to make the annular sealing washer 314 of the inner pipe press against the annular flange 22f of the water inlet member 22 to create a sealing effect, as shown in Fig. 4. therefore, when the user turns on the faucet, after flowing into the inner chamber 201 through the inlet space 22c and the circumferential flutes 22e of the water inlet member 22, the water coming from the hose will be stopped by the sealing structure created by the annular sealing washer 314 pressing against the annular flange 22f from entering the water inlet gaps 313 of the inner pipe 30. By such arrangements, water cannot run out of the faucet when the faucet is turned on and the spray head 1 is pulled out, thus preventing water spilling everywhere. Furthermore, when the faucet is turned off, the sealing structure formed by the annular sealing washer 314 and the annular flange 22f can also create an anti-siphon function to prevent dirty water from being sucked into the spray head and causing water pollution, even if the spray head 1 falls into the sink filled with washing water.

Or, when the spray head 1 is pulled out to the desired position while the faucet is opened, the user can push the manually operated switch 50 downward with the finger of his hand holding the spray head 1, as shown in Fig. 14, so that the linkage 60 is caused to retract and the inner pipe 30 is caused to move toward the lower end of the inner chamber 201, as a result, the annular sealing washer 314 of the inner pipe moves downward away from the annular flange 22f into an open state to allow the water to run out of the faucet. When the user finished with the faucet, he/she can release the manually operated switch 50, the return spring 40 will push the inner pipe upward and back to its original position, thus stopping the water from running and creating an anti-siphon effect, as shown in Fig. 4. at this moment, dirty water can also be prevented from being sucked into the spray head and causing water pollution if the spray head 1 falls into the sink filled with washing water by accident.

The pullout spray head 1 in accordance with the present invention has the following advantages: first, inside the spray head 1, the return spring 40 pushes the annular sealing washer 314 at the upper portion of the inner pipe 30 to press against the annular flange 22f of the inner chamber 201 of the water supply device 20, creating a sealing and anti-siphon structure. Since the anti-siphon structure can be opened manually by pushing the manually operated switch 50, it can be closed by the return spring 40 with a relatively large restoring force, the anti-siphon capability of the spray head 1 is improved substantially. Second, the movable inner 30 of the present invention can be used as an inner passage 311, besides that, the relatively large lower end of the inner pipe 30 can also be used to position the return spring with a relatively elastic force between the water supply device 20 and the inner pipe 30, satisfying the requirement of an anti-siphon structure. Third, the cooperation of the anti-siphon structure formed between the inner chamber 201 of the water supply device 20 and the inner pipe 30 and the design that the circumferential flutes 22e around the periphery of the inner chamber 201 are in communication with the inlet space 22c, and the water flowing into the inner chamber 201 should be subject to an anti-siphon structure before entering the water inlet gaps 313 at the upper end of the inner pipe 30 can prevent the anti-siphon from being opened by the water flow impact or water pressure, especially when the water pressure is greater than the elastic force of the return spring, creating a very good water stop effect and without the worry of leakage. Fourth, the connection design between the manually operated switch 50 and the linkage 60 keeps the anti-siphon structure in the opened state in normal condition before the spray head 1 is pulled out, allowing the faucet to be used in the same way as a conventional faucet, and the water will flow out simply by turning on the faucet. When the spray head I is pulled out of the faucet, the inner pipe 30 will be pushed upward by the return spring 40 to close the anti-siphon structure automatically, forming a water stop or anti-siphon effect, hence, it prevents dirty water from being sucked into the spray head and causing water pollution. At this moment, the anti-siphon structure can be easily opened to let the water flow out again simply by pushing the manually operated switch 50 downward to move the inner pipe 30, thus simplifying the water flow stop and start operation. Fifth, the structure of the present invention which is axially movable between the inner pipe 30 and the water supply device 20 and is capable of restricting radial rotation ensures the smooth movement of the inner pipe 30.

While we have shown and described various embodiments in accordance with the present invention, it is clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.

Claims

WHAT IS CLAIMED IS: 1. A pullout spray head comprising: a water supply device including an inlet space, an outlet space defined at an upper and a lower ends thereof, respectively, and an inner chamber defined between the inlet space and the outlet space, the inlet space being upward connected to a hose and downward connected to an upper portion of an inner surface of the inner chamber via at least one circumferential flute, the outlet space being connected to a lower portion of the inner chamber, a first sealing portion disposed between an upper end of the inner surface of the inner chamber and the lower end of the circumferential flute, a slot being axially defined in the inner surface of the inner chamber of water supply device; an inner pipe non-rotatably disposed in the inner chamber of the water supply device and including an upper end, a lower end and an inner passage defined therebetween, on an upper end of the inner pipe being defined at least one water inlet gap, on an outer surface of the inner pipe below the water inlet gap being disposed a second sealing portion, a first and a second sealing structures being slidably and sealingly disposed between the outer surface of the inner pipe and the inner surface of the inner chamber, the first sealing structure being located between the slot and the circumferential flute, the second sealing structure being located between the slot and the lower end of the inner pipe, wherein the inner pipe, in normal condition, is pushed toward the upper end of the inner chamber by an elastic force, making the first and second sealing portions press against each other to create a sealing effect, so that water that comes from the inlet space of the water supply device and flows into the inner chamber via the circumferential flute is stopped between the first sealing structure and the first and second sealing portions, thus creating an anti-siphon effect, when the inner pipe is pushed toward a lower end of the inner chamber, the first and second sealing portions will disengage from each other to turn into an open state, so that the water that comes from the inlet space of the water supply device and flows into the inner chamber via the circumferential flute is able to flow to the water inlet gap via the first and the second sealing portions and finally flow to the outlet space via the inner passage of the inner pipe, and thus the water flows out of the spray head; and a manually operated switch assembled on the water supply device and connected to the inner pipe via the slot, wherein the manually operated switch can be pushed to move downward so as to move the inner pipe toward the lower end of the inner chamber, thus allowing the water to flow or turning off the anti-siphon effect, when a pushing force acted on the manually operated switch is released, the manually operated switch will be pushed by the elastic force to move back to its original position along the inner pipe.
2. The pullout spray head as claimed in claim 1, wherein the water supply device comprises a housing, a water inlet member which is non-rotatably disposed in the housing and partially protruded out of an upper end of the housing, a middle member connected to a lower end of the water inlet member, and a water outlet member connected between a lower end of the housing and a lower end of the middle member, the water inlet member is provided with the inlet space, the circumferential flute, the first sealing portion and an upper portion of the inner chamber, the middle member is provided with the slot and a middle portion of the inner chamber, the water outlet member is provided with the outlet space and a lower portion of the inner chamber.
3. The pullout spray head as claimed in claim 2, wherein a choke portion is formed between an upper end of the water inlet member and the upper portion of the inner chamber, the circumferential flute is located around the choke portion and in communication with the inlet space and an inner surface of the upper portion of the inner chamber, plural guiding slots are axially formed in the inner surface of the inner chamber and located above the choke portion, plural guiding portions extend from the upper end of the inner pipe and are to be movably restricted in the guiding slots, and the water inlet gap is defined any two neighboring guiding portions.
4. The pullout spray head as claimed in claim 2, wherein the first sealing portion of the water inlet member is an annular flange, and the second sealing portion of the inner pipe is annular sealing washer.
5. The pullout spray head as claimed in claim 1, wherein the first sealing portion of the water supply device is an annular flange, and the second sealing portion of the inner pipe is annular sealing washer.
6. The pullout spray head as claimed in claim 2, wherein an annular sealing washer is disposed at a connecting portion between the water inlet member and the middle member and is slidably in sealing contact with an outer surface of the inner pipe, forming the first sealing structure.
7. The pullout spray head as claimed in claim 2, wherein the water inlet member is provided with a dividing portion connected between its inner surface thereof, the lower portion of the inner chamber is located above the dividing portion, the outlet space is located below the dividing portion, plural holes are defined in the dividing portion and in communication with the lower portion of the inner chamber and the outlet space, close to a lower end of the outer surface of the inner pipe is disposed an annular sealing washer which is slidably in sealing contact with the inner surface of the lower portion of the water outlet member, forming the second sealing structure.
8. The pullout spray head as claimed in claim 2, wherein a filter is disposed at the outlet space of the water outlet member.
9. The pullout spray head as claimed in claim 7, wherein a return spring is biased between the lower end of the inner pipe and a top surface of the dividing portion of the water outlet member to provide a force for pushing the inner pipe toward the upper end of the inner chamber of the water supply device.
10. The pullout spray head as claimed in claim 2, wherein a protrusion 316 is formed on the outer surface of the inner pipe and protrudes outward from the slot of the middle member, the manually operated switch comprises a press portion and a connecting portion extending inward from the press portion, the connecting portion is defined with an inserting hole for the insertion of the inner pipe and engagement with the protrusion of the inner pipe.
11. The pullout spray head as claimed in claim 1 further comprising a linkage received in the water supply device and includes a fixed end and a movable end, the fixed end is connected with a connecting portion where the manually operated switch and the inner pipe are connected, so as to make the linkage to move together with the manually operated switch, the movable end is disposed at the upper end of the water supply device and is allowed to be pressed into a retracted state by a part of the faucet, consequently pushing the inner pipe toward the lower end of the inner chamber, making the first and second sealing portions disengage from each other to turn into an open state, or the inner pipe is caused to move back into a retracted state when the manually operated switch is pressed downwards.
12. The pullout spray head as claimed in claim 1 further comprising a linkage and a ferrule, the linkage received in the water supply device and includes a fixed end and a movable end, the fixed end is connected with a connecting portion where the manually operated switch and the inner pipe are connected, so as to make the linkage to move together with the manually operated switch, the movable end is disposed at the upper end of the water supply device, the ferrule is disposed at an upper end of the faucet and opposite the water supply device, the movable end of the linkage is allowed to be pressed into a retracted state by a lower end of the ferrule, causing a movement of the inner pipe toward the lower end of the inner chamber, so that the first and second sealing portions disengage from each other and turn into an open state, or the inner pipe is caused to move back into a retracted state when the manually operated switch is pressed downwards.
13. The pullout spray head as claimed in claim 12, wherein at least one locking block protrudes outward from an outer surface of the upper portion of the water supply device, the ferrule is axially provided with at least one upward-extending guiding slot, and a locking slot is formed in a radial direction of the ferrule and in communication with an upper end of the guiding slot, so that after entering the guiding slot, the locking block is engaged in the locking slots by rotating the water inlet member, thus fixing the water supply device onto the faucet, and the linkage, in normal condition, is pressed by the ferrule into a retracted position.
14. A pullout spray head substantially as hereinbefore described with reference to and as shown in Figures 2 to 14 of the accompanying drawings.Amendments to the Claims have been filed as follows: WHAT IS CLAIMED IS: 1. A pullout spray head comprising: a water supply device including an inlet space, an outlet space defined at an upper and a lower ends thereof, respectively, and an inner chamber defined between the inlet space and the outlet space, the inlet space being upward connected to a hose and downward connected to an upper portion of an inner surface of the inner chamber via at least one circumferential flute, the outlet space being connected to a lower portion of the inner chamber, a first sealing portion disposed between an upper end of the inner surface of the inner chamber and the lower end of the circumferential flute, a slot being axially defined in the inner surface of the inner chamber of water supply device; an inner pipe non-rotatably disposed in the inner chamber of the water supply device and including an upper end, a lower end and an inner passage defined therebetween, on an upper end of the inner pipe being defined at least one water inlet gap, on an outer surface of the inner pipe below the water inlet gap being disposed a second sealing portion, a first and a second sealing structures being slidably and sealingly disposed between the outer surface of the inner pipe and the inner surface of the inner chamber, the first sealing structure being located between the slot and the circumferential flute, the second sealing structure being located between the slot and the lower end of the inner pipe, wherein the inner pipe, in normal condition, is pushed toward the upper end of the inner chamber by an elastic force, making the first and second sealing portions press against each other to create a sealing effect, so that water that comes from the inlet space of the water supply device and flows into the inner chamber via the circumferential flute is stopped between the first sealing structure and the first and second sealing portions, thus creating an anti-siphon effect, when the inner pipe is pushed toward a lower end of the inner chamber, the first and second sealing portions will disengage from each other to turn into an open state, so that the water that comes from the inlet space of the water supply device and flows into the inner chamber via the circumferential flute is able to flow to the water inlet gap via the first and the second sealing portions and finally flow to the outlet space via the inner passage of the inner pipe, and thus the water flows out of the spray head; and a manually operated switch assembled on the water supply device and connected to the inner pipe via the slot, wherein the manually operated switch can be pushed to move downward so as to move the inner pipe toward the lower end of the inner chamber, thus allowing the water to flow or turning off the anti-siphon effect, when a pushing force acted on the manually operated switch is released, the manually operated switch will be pushed by the elastic force to move back to its original position along the inner pipe.2. The pullout spray head as claimed in claim 1, wherein the water supply device comprises a housing, a water inlet member which is non-rotatably disposed in the housing and partially protruded out of an upper end of the housing, a middle member connected to a lower end of the water inlet member, and a water outlet member connected between a lower end of the housing and a lower end of the middle member, the water inlet member is provided with the inlet space, the circumferential flute, the first sealing portion and an upper portion of the inner chamber, the middle member is provided with the slot and a middle portion of the inner chamber, the water outlet member is provided with the outlet space and a lower portion of the inner chamber.3. The pullout spray head as claimed in claim 2, wherein a choke portion is formed between an upper end of the water inlet member and the upper portion of the inner chamber, the circumferential flute is located around the choke portion and in communication with the inlet space and an inner surface of the upper portion of the inner chamber, plural guiding slots are axially formed in the inner surface of the inner chamber and located above the choke portion, plural guiding portions extend from the upper end of the inner pipe and are to be movably restricted in the guiding slots, and the water inlet gap is defined any two neighboring guiding portions.4. The pullout spray head as claimed in claim 2, wherein the first sealing portion of the water inlet member is an annular flange, and the second sealing portion of the inner pipe is annular sealing washer.5. The pullout spray head as claimed in claim 1, wherein the first sealing portion of the water supply device is an annular flange, and the second sealing portion of the inner pipe is annular sealing washer.6. The pullout spray head as claimed in claim 2, wherein an annular sealing washer is disposed at a connecting portion between the water inlet member and the middle member and is slidably in sealing contact with an outer surface of the inner pipe, forming the first sealing structure.7. The pullout spray head as claimed in claim 2, wherein the water inlet member is provided with a dividing portion connected between its inner surface thereof, the lower portion of the inner chamber is located above the dividing portion, the outlet space is located below the dividing portion, plural holes are defined in the dividing portion and in communication with the lower portion of the inner chamber and the outlet space, close to a lower end of the outer surface of the inner pipe is disposed an annular sealing washer which is slidably in sealing contact with the inner surface of the lower portion of the water outlet member, forming the second sealing structure.8. The pullout spray head as claimed in claim 2, wherein a filter is disposed at the outlet space of the water outlet member.9. The pullout spray head as claimed in claim 7, wherein a return spring is **;":*. biased between the lower end of the inner pipe and a top surface of the dividing S. *$ S * S*t,..t,... portion of the water outlet member to provide a force for pushing the inner pipe ** S. toward the upper end of the inner chamber of the water supply device. . .10. The pullout spray head as claimed in claim 2, wherein a protrusion 316 * ,. S. ..%.4 is formed on the outer surface of the inner pipe and protrudes outward from the slot S....of the middle member, the manually operated switch comprises a press portion and a connecting portion extending inward from the press portion, the connecting portion is defined with an inserting hole for the insertion of the inner pipe and engagement with the protrusion of the inner pipe.11. The pullout spray head as claimed in claim 1 further comprising a linkage received in the water supply device and including a fixed end and a movable end, the fixed end is connected with a connecting portion where the manually operated switch and the inner pipe are connected, so as to make the linkage to move o together with the manually operated switch, the movable end is disposed at the upper end of the water supply device and is allowed to be pressed into a retracted state by a part of the faucet, consequently pushing the inner pipe toward the lower end of the inner chamber, making the first and second sealing portions disengage from each other and the inner pipe is caused to move to an open state when the manually operated switch is pressed downwards.12. The pullout spray head as claimed in claim 1 further comprising a linkage and a ferrule, the linkage being received in the water supply device and including a fixed end and a movable end, the fixed end is connected with a connecting portion where the manually operated switch and the inner pipe are a.;s:. connected, so as to make the linkage to move together with the manually operated 1.* .t,, switch, the movable end is disposed at the upper end of the water supply device, the *: ferrule is disposed at an upper end of the faucet and opposite the water supply device, * . the movable end of the linkage is allowed to be pressed into a retracted state by a * ? *.* lower end of the ferrule, causing movement of the inner pipe toward the lower end of * * * *. * * .** the inner chamber, so that the first and second sealing portions disengage from each other and the inner pipe is caused to move back to an open state when the manually operated switch is pressed downwards.13. The pullout spray head as claimed in claim 12, wherein at least one locking block protrudes outward from an outer surface of the upper portion of the water supply device, the ferrule is axially provided with at least one upward-extending guiding slot, and a locking slot is formed in a radial direction of the ferrule and in communication with an upper end of the guiding slot, so that after entering the guiding slot, the locking block is engaged in the locking slots by rotating the water inlet member, thus fixing the water supply device onto the faucet, and the linkage, in normal condition, is pressed by the ferrule into a retracted position.14. A pullout spray head substantially as hereinbefore described with reference to and as shown in Figures 2 to 14 of the accompanying drawings.