Tube-in-tube pull-out faucet

Abstract

The invention provides a tube-in-tube pull-out faucet which comprises a faucet body and an outer tube fixed to the faucet body, and further comprises a tube-in-tube pull-out device located above the faucet body, wherein the tube pull-out device comprises an inner tube joint, an inner tube joint nut, an inner tube, a first spring bracket, a first pull-out tube joint, a pull-out tube and a telescopic spring which are disposed in a cavity of the outer tube, one end of the inner tube joint is sleeved on the faucet body or the outer tube and the other end thereof is screwed to the inner tube joint nut, the inner tube joint is provided with an integrally formed joint portion, and an outer side wall of the joint portion is in sliding fit with an inner side wall of one end of the inner tube. Compared with the prior art, the invention can reduce the interference with many parts or even difficulty in pulling due to the tube-in-tube pull-out device disposed above the faucet body, has the advantages of convenience and smoothness in pull-out and low cost, can be conveniently and quickly replaced after sale, can be rotated by 360 degrees and is convenient to use.

Claims

1. A tube-in-tube pull-out faucet having a faucet body and an outer tube fixed to the faucet body, comprising: a tube-in-tube pull-out device located above the faucet body, wherein the tube-in-tube pull-out device further comprises: an inner tube; a first spring bracket; a stretchable pull-out tube; and a telescopic spring which are disposed in a cavity of the outer tube, wherein the inner tube has a first end passing through a first spring bracket connected to the faucet body; the stretchable pull-out tube has a first end slidably sleeving a portion of the inner tube adjacent the first end of the inner tube in a returned position, and a second end of the pull-out tube is located within the telescopic spring; the telescopic spring has a first end fixed on the first spring bracket, and a second end fixed on the second spring bracket; the pull-out tube is connected to one end of a second pull-out joint via a screwed connection, and another end of the second pull-out joint is connected to a water-discharge head, whereby upon release of the water-discharge head and the pull-out tube from a pulled-out position, the pull-out tube is configured to, via a return force of the telescopic spring, move to the returned position.

2. The tube-in-tube pull-out faucet according to claim 1, further comprising a low-pressure sealing ring and a back-pressure oil seal ring which are sleeved on an outer side wall of the inner tube, wherein the back-pressure oil seal ring is arranged above the low-pressure sealing ring, and the low-pressure sealing ring and the back-pressure oil seal ring are located in the first spring bracket.

3. The tube-in-tube pull-out faucet according to claim 1, further comprising a first sealing ring, a second sealing ring and a third sealing ring, wherein the first sealing ring and the third sealing ring are clamped on an inner wall of the outer tube in a spaced manner, and the second sealing ring is sleeved on the inner tube joint nut and located between the first sealing ring and the third sealing ring.

4. The tube-in-tube pull-out faucet according to claim 1, wherein the inner tube is made of a polyamide (PA) material.

5. The tube-in-tube pull-out faucet according to claim 1, wherein the outer tube, the inner tube and the pull-out tube are U-shaped.

6. The tube-in-tube pull-out faucet according to claim 1, wherein the first spring bracket is connected to the faucet body by using an inner tube joint nut arranged below the first spring bracket, the inner tube joint nut is screwed to one end of an inner tube joint, and another end of the inner tube joint is sleeved by the faucet body.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a front view of a tube-in-tube pull-out faucet;

(2) FIG. 2 is a structural view of a tube-in-tube pull-out faucet taken from another angle and an A-A sectional view at this viewing angle;

(3) FIG. 3 is an enlarged sectional structural view of part B of a tube-in-tube pull-out faucet;

(4) FIG. 4 is an enlarged sectional structural view of part C of a tube-in-tube pull-out faucet;

(5) FIG. 5 is a perspective sectional structural view of a part of a tube-in-tube pull-out faucet; and

(6) FIG. 6 is an enlarged sectional structural view of part D of FIG. 5.

DESCRIPTION OF REFERENCE NUMERALS OF ELEMENTS

(7) TABLE-US-00001 1 Faucet body 2 Outer tube 3 Tube-in-tube pull-out device 31 Inner tube joint 32 Inner tube joint nut 33 Inner tube 34 First spring bracket 35 First pull-out tube joint 36 Pull-out tube 37 Telescopic spring 38 Second pull-out joint 39 Second spring bracket 4 Pull-out water-discharge head 5 Low-pressure sealing ring 6 Back-pressure oil seal ring 7 First sealing ring 8 Second sealing ring 9 Third sealing ring

DETAILED DESCRIPTION OF THE INVENTION

(8) The embodiments of the invention will be described below by specific particular embodiments, and the persons skilled in the art can readily know other advantages and effects of the invention from the disclosures of the present description.

(9) It should be understood that the structures, proportions, sizes and the like illustrated in the drawings of the specification are only used in combination with the disclosures of the present description for the purpose of understanding and reading by the persons skilled in the art, and are not intended to limit the implementability of the invention, and therefore do not have any technical significance. Any structural modification, change in the proportional relation or size adjustment should fall within the scope that can be covered by the technical contents disclosed in the invention without affecting the effects and objects achievable by the invention. Moreover, the terms such as upper, lower, left, right, intermediate and one used in the present description are also merely for the sake of description and clarity and are not intended to limit the implementable scope of the invention, and the change or adjustment in the relative relation should also be considered within the implementable scope of the invention without substantial changes in the technical contents. The specific structures can be described with reference to the drawings of the patent application.

(10) In the following embodiments, the directions are defined by the arrow directions in FIG. 1 of the paper, the left side of the paper is the left direction, the right side of the paper is the right direction, the upper side of the paper is the upper direction, the lower side of the paper is the lower direction, the front side perpendicular to the paper is the front direction, the rear side perpendicular to the paper is the rear direction, the cavity of the faucet body is the inside and the outer side wall of the faucet body is the outside.

(11) As shown in FIGS. 1, 2, 3, 4, 5 and 6, a tube-in-tube pull-out faucet comprises a faucet body 1 and an outer tube 2 fixed to the faucet body 1, and further comprises a tube-in-tube pull-out device 3 located above the faucet body 1, wherein the tube pull-out device 3 comprises an inner tube joint 31, an inner tube joint nut 32, an inner tube 33, a first spring bracket 34, a first pull-out tube joint 35, a stretchable pull-out tube 36 and a telescopic spring 37 which are disposed in a cavity of the outer tube 2, one end of the inner tube joint 31 is sleeved on the faucet body 1 or the outer tube 2 and the other end thereof is screwed to the inner tube joint nut 32, the inner tube joint 31 is provided with an integrally formed joint portion, an outer side wall of the joint portion is in sliding fit with an inner side wall of one end of the inner tube 33, the other end of the inner tube 33 is sequentially passed through the first spring bracket 34 and the first pull-out tube joint 35 and arranged in the pull-out tube 36, the first spring bracket 34 is arranged above the inner tube joint nut 32, the first pull-out tube joint 35 is sleeved in the inner tube joint nut 32, one end of the pull-out tube 36 is movably sleeved on the first pull-out tube joint 35, the telescopic spring 37 is wound around an outer side wall of the pull-out tube 36, one end of the telescopic spring 37 is fixed on the first spring bracket 34, the other end of the pull-out tube 36 is screwed with a second pull-out joint 38, one end of the second pull-out joint 38 is communicated with one end of the inner tube 33, the other end of the second pull-out joint 38 is in screwed communication with a pull-out water-discharge head 4 which is movably sleeved in the outer tube 2, a second spring bracket 39 is sleeved on outer side walls of the second pull-out joint 38 and the pull-out water-discharge head 4, and the other end of the telescopic spring 37 is fixed to the second spring bracket 39. By utilizing such structure, compared with the prior art, the invention can reduce the interference with many parts or even difficulty in pulling during pull-out due to no need to pull the inner tube 33 from below the faucet by means of the tube-in-tube pull-out device 3 arranged above the faucet body 1 in combination with the tube-in-tube structure consisting of the outer tube 2, the pull-out tube 36 and the inner tube 33, has the advantages of convenience and smoothness in pull-out, a simple structure and low cost, can be replaced as a whole when needed, can be conveniently and quickly repaired with high efficiency after sale, can be rotated by 360 degrees and is convenient to use and has no pull out tube protruding below the faucet mounting as all the pull out tubes and mechanism are mounted within the spout.

(12) Further, in order to improve the airtightness, as shown in FIG. 3, the tube-in-tube pull-out faucet further comprises a low-pressure sealing ring 5 and a back-pressure oil seal ring 6 which are sleeved on an outer side wall of the inner tube 33, wherein the back-pressure oil seal ring 6 is arranged above the low-pressure sealing ring 5, and the low-pressure sealing ring 5 and the back-pressure oil seal ring 6 are located in the first spring bracket 34. In this way, the airtightness is improved and water leakage can be avoided. In addition, when the pull-out tube 36 is released for backlash, the arrangement of the back-pressure oil seal ring 6 can effectively counteract the impact force and can reduce the wear of the first spring bracket 34, thereby prolonging the service life and reducing the maintenance cost.

(13) Further, as shown in FIG. 4, the tube-in-tube pull-out faucet further comprises a first sealing ring 7, a second sealing ring 8 and a third sealing ring 9, wherein the first sealing ring 7 and the third sealing ring 9 are clamped on an inner wall of the outer tube 2 in a spaced manner, and the second sealing ring 8 is sleeved on the inner tube joint nut 32 and located between the first sealing ring 7 and the third sealing ring 9.

(14) Further, the inner tube 33 is made of a polyamide (PA) material (or similar). However, its materials are not limited thereto, and the inner tube 33 may also be made of other materials, e.g. a rigid inner tube 33.

(15) Further, as shown in FIGS. 1, 3 and 4, the outer tube 2, the inner tube 33 and the pull-out tube 36 are U-shaped. However, their shapes are not limited thereto, and it is also possible to provide the outer tube 2 or the inner tube 33 or the pull-out tube 36 with other shapes or in combination.

(16) As described above, the tube-in-tube pull-out faucet involved in the invention has the following beneficial effects:

(17) By utilizing the above tube-in-tube pull-out faucet, compared with the prior art, the invention can reduce the interference with many parts or even difficulty in pulling during pull-out due to no need to pull the inner tube from below the faucet by means of the tube-in-tube pull-out device arranged above the faucet body in combination with the tube-in-tube structure consisting of the outer tube, the pull-out tube and the inner tube, has the advantages of convenience and smoothness in pull-out, a simple structure and low cost, can be replaced as a whole when needed, can be conveniently and quickly repaired with high efficiency after sale, can be rotated by 360 degrees and is convenient to use.

(18) In summary, the invention effectively overcomes various disadvantages in the prior art and has a high industrial application value.

(19) The above embodiments are only used for illustratively describing the principles and effects of the invention, rather than limiting the invention. Any persons skilled in the art can make modifications or changes to the above embodiments without departing from the spirit and scope of the invention. Accordingly, all equivalent modifications or changes made by the persons having ordinary skill in the art without departing from the spirit and technical thought disclosed in the invention still shall be covered by the claims of the invention.