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United States Patent [i9] [ii] Patent Number: 5,447,258
Suzuki  Date of Patent: Sep. 5,1995
U.S. Patent Sep. 5,1995 sheet 1 of 2 5,447,258
 SPOUT FOR LIQUID PUMP
 Inventor: Kazuo Suzuki, Koto, Japan
 Assignee: Yoshino Kogyosho Co., Ltd., Tokyo, Japan
 Appl. No.: 193,040
 PCT Filed: Dec. 28,1992
 PCT No.: PCT/JP92/01735
§ 371 Date: Apr. 4,1994
§ 102(e) Date: Apr. 4,1994  PCT Pub. No.: W093/25319
PCT Pub. Date: Dec. 23,1993
 Foreign Application Priority Data
Jun. 17, 1992 [JP] Japan 4-158309
 Int. Cl.« B65D 5/72
 U.S. CI 222/494; 222/341;
222/507; 222/527; 239/533.13; 239/DIG. 12
 Field of Search 222/321, 341, 491, 494,
222/507, 527; 239/533.13, 602, DIG. 12
 References Cited
U.S. PATENT DOCUMENTS
5,033,647 7/1991 Smith et al 222/494 X
5,163,588 11/1992 Cater 222/341 X
5,192,006 3/1993 van Brocklin et al 222/341 X
A spout for a liquid pump includes a first valve body mounted onto an outlet of a liquid pump. The first valve body includes a bottom part that has a flowing hole, and a cylindrical body and a shaft extend from the bottom part. The cylinder body and the shaft define an annular space in which the flowing hole is disposed. A second valve body includes an engaging part engaged with a distal end of the cylinder body of the first valve body, and a cylindrical body extends from the engaging part. The cylindrical body is partially disposed within the annular space and has a smaller diameter at an end so as to form an end opening part of the cylindrical body that is resiliently fittable on the shaft.
4 Claims, 2 Drawing Sheets
U.S. Patent Sep. 5,1995 sheet 2 of 2 5,447,258
SPOUT FOR LIQUID PUMP
BACKGROUND OF THE INVENTION
The present invention relates to a spout for a liquid 5 pump. More particularly, this invention relates to a spout in which an outlet is closed to prevent contents from getting dry when the spout is not in use.
One spout, which is mounted onto an outlet of a liquid pump and closed to prevent its contents from 10 getting dry when the spout is not in use, is described in Japanese Utility Model Publication No. 21367/1976.
As shown in FIG. 2, such a conventional spout is formed with a pipe 132 extending from a base 131 that provides a passage 130 inside and an end of the pipe 132 15 that is closed by a tap 133. A hole 134 is provided on a side surface near the end of the pipe 132, which enables the passage 130 to communicate with the outside. A cap 135 is provided on the end of the pipe 132 so as to close the hole 134. Further, a spout 136 is provided in an end 20 of the cap 135. When the contents are supplied through the passage 130 by a pump not shown, the inside of the cap 135 is pressurized through the hole 134 and is expanded. Thereby, the content of the pipe are sent through the hole 134 between the pipe 132 and the cap 25 135 and ejected outwardly from the spout 136. When it is not in use, because the cap 135 and the pipe 132 are closely fitted, the contents are isolated from the open air.
FIG. 3 shows a fixed ring 137 provided circumferen- 30 tially on a cap 135 so as to strengthen the fixation of the cap 135 to the pipe 132, and FIG. 4 shows its motion (i.e., during dispensing).
FIG. 5 shows a passage 230 within a pipe 232 forming a trigonal pyramid at an end, accordingly, a hole 234 is 35 aslant.
In the conventional spout described above, however, because a cap 135 and a pipe (132 and 232) are closely fitted when the pump is not in use, the contents tend to work as glue, which prevents easy operation of the 40 spout.
In the conventional spout shown in FIGS. 3 and 5, in addition to the foregoing problems, the spout tends to be complicated and troublesome to manufacture because a fixed ring 137 and 237 must be provided. 45
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a spout for a liquid pump, of which assembly is easy and the closing motion is smooth and accurate. 50
To achieve the object described above, the present invention provides a spout for a liquid pump, comprising: a first valve constitutive body mounted onto an outlet of a liquid pump, providing a bottom part which has a flowing hole with a cylinder body, and being 55 formed with a shaft extended from the bottom; an engaging part being formed to be engaged to the cylinder body of the first valve constitutive body; and a second valve constitutive body, which is extended from the engaging part, providing a cylindrical body having a 60 smaller diameter at an end so as to form an end opening part of the cylindrical body to fit onto the shaft.
In the above spout, the second valve constitutive body may be formed out of flexible synthetic resin to provide resiliency to the cylindrical body. In the above 65 spout, it is easy to assemble the spout closed constantly because it can be constituted by fitting the second valve constitutive body into the first valve constitutive body.
In addition, in the inventive spout, the end opening part of the cylindrical body may be fitted outwardly to the shaft when it is not in use, that is, the inside of the liquid pump is airtight when not in use. On the other hand, pressing an outlet of the liquid pump makes the end opening part of the cylindrical body slightly open, which discharge the contents. In the above spout, at this time, a contact area of the shaft and the end opening part of the cylindrical body is limited to nearly a circular line, which prevents the jamming of the content and makes the opening and closing motion easy and accurate in comparison with conventional spouts which have problems because the shaft and the opening of the end of the cylindrical body are closely fitted with a large area.
Other features and advantages of the present invention will become apparent from the following description taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sectional view showing an embodiment of a spout for a pump according to the present invention.
FIG. 2 is a sectional view showing a conventional spout for a pump.
FIG. 3 is a sectional view showing a conventional spout for a pump.
FIG. 4 is a sectional view showing the conventional spout for a pump of FIG. 3 in order to explain its motion.
FIG. 5 is a sectional view showing a conventional spout for a pump.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Now, an embodiment of a spout for a liquid spray according to the present invention will be described with reference to FIG. 1.
In FIG. 1, a liquid pump 1 shows a general pushdown pump. This pump will be described briefly in the following description. A cylinder 35 is inserted into a container main body 31 through a cylindrical opening part 33 of the container main body 31. A ring plate 37 has an outer diameter greater than that of the opening diameter of the cylindrical opening part 33 to be fitted to the upper part of the cylinder 35. The ring plate 37 and the upper part of the cylinder 35 are covered with a cap 39 that screws onto the cylindrical opening part 33 so as to be fixed to the opening part 33.
A suction pipe 41 is connected to the bottom opening of the cylinder 35. A ball valve 43 is provided on the inside of the lower part of the cylinder 35. There is also provided a spring 45 inside the upper part of the same. A piston pipe 47, which is urged upwards by the spring 45, is fitted in the cylinder 35 in an up-and-down freely movable manner. A piston 49 is provided on the circumference of the piston pipe 47 and contacts closely with an inner surface of the cylinder 35. While a bottom of the piston pipe 47 is closed, a communicating hole 51 is provided at a portion slightly upwards from the bottom. The piston 49 freely moves up and down relative to the piston pipe 47, which constitutes a check valve 52, to open and close the communicating hole 51 between the piston 49 and piston pipe 47 by the up-and-down motion.
A pipe 2 is connected to the piston pipe 47 of the liquid pump 1, which allows the contents that are pres