Container for feeding stick type cosmetic material

Details Container for feeding stick type cosmetic material Container for feeding stick type cosmetic material

2000-07-14

2001-12-18

Huson, Gregory L. (Department: 3751)

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including means to advance material

C401S087000

Reexamination Certificate

active

06331084

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a container for feeding a stick type cosmetic material, such as lipstick, eyeliner, or the like. Particularly, it relates to a container for feeding a stick type cosmetic material which can reduce the number of parts employed therein and can easily be assembled. Further, it relates to a container for feeding a stick type cosmetic material which is also suitable for direct filling of cosmetic materials.
BACKGROUND ART
One of the conventional containers for feeding a stick type cosmetic material is disclosed in Japanese Utility Model Laid-Open Publication No. Sho 59-130612. As shown in
FIG. 13
, a feeding mechanism of the container for feeding a stick type cosmetic material excluding a container body cylinder is composed of a push rod
943
with a cosmetic material supporting bowl
941
, a front cylinder sleeve
949
, and an internal thread cylinder
957
. The push rod
943
is connected to a lower part of the cosmetic material supporting bowl
941
as one body, and a stopper
945
is projecting at a tail section of the push rod
943
. The cosmetic material supporting bowl
941
slides on an inside surface of the front cylinder sleeve
949
. An external thread installed on an outside surface of the push rod
943
is spirally engaged with an internal thread
955
installed on an inside surface of an upper part of the internal thread cylinder
957
.
The stopper
945
installed at the push rod
943
of the container for feeding a stick type cosmetic material is shaped like a downward wedge. That is to say, a lower side surface of the stopper
945
is a taper
946
, and an upper side surface is a contact surface
944
which extends sideward. A flange
951
which extends to an inside surface of the front cylinder sleeve
949
is engaged with the stopper
945
.
More specifically, a flange hole
953
provided inside the flange
951
has a shape which definitely corresponds to a section of the stopper
945
installed at a tail end of the push rod
943
. However, a distance of two parallel walls of the flange hole
953
which are provided in parallel with each other is slightly narrower than a width of the stopper
945
of the push rod
943
. Incidentally, a similar stopper is also installed on a backside of the push rod
943
.
Therefore, when the push rod
943
is built into the front cylinder sleeve
949
at the time of assembly, the supporting bowl
941
is pushed downward so that the stopper
945
of the push rod
943
passes through (press fit) the flange hole
953
of the front cylinder sleeve
949
. The taper
946
provided under the stopper
945
is used for facilitating the press fit. After the stopper
945
passes through the flange hole
953
, the contact surface
944
provided on an top surface of the stopper
945
comes into contact with an under surface of the flange
951
, whereby the push rod
943
does not get out of the front cylinder sleeve
949
. Thus, a feeding end of the push rod
943
is defined.
Such a conventional container for feeding a stick type cosmetic material is aimed for reduction of the parts to be employed therein and facilitation of assembly. However, it is necessary to align the push rod
943
and the front cylinder flange hole
953
at around the axial at the time of assembly, whereby it is not easy to assemble.
On the other hand, in the case of a container in which direct filling of a cosmetic material is carried out after assembly, in order to prevent damage, such as fracture of the cosmetic material, coming off a chuck (cosmetic material retaining section), or the like, it is important to reduce slide resistance of the cosmetic material and the front cylinder hole and to feed or retract the cosmetic material straight to the front cylinder without weaving of the chuck.
DISCLOSURE OF THE INVENTION
The present invention is made in order to cope with such problems. An object of the present invention is to provide a container for feeding a stick type cosmetic material which can reduce the number of parts employed therein and can easily be assembled.
Further, another object of the present invention is to provide a container for feeding a stick type cosmetic material which is also suitable for direct filling of the cosmetic material.
In order to achieve the objects described above, the container for feeding a stick type cosmetic material according to the present invention is characterized in that there are provided a chuck which retains a stick type cosmetic material, a front cylinder having an internal hole which guides the chuck to easily slide in an axial direction, a push rod which is connected with the chuck and has external-thread-shaped projections on its outside surface, and a body cylinder which is rotatably connected with the front cylinder and also has internal threads to be spirally engaged with the external-thread-shaped projections of the push rod, and unevennesses having an almost same section are formed on a periphery surface of the external-thread-shaped projections of the push rod in an axial direction and synchronous engagement unevennesses, which synchronously engage the push rod and the front cylinder by being engaged with the aforementioned unevennesses, are formed on an inside surface of the front cylinder.
In the container for feeding a stick type cosmetic material according to the present invention like conventional containers, when the front cylinder and the body cylinder are relatively rotated, the external-thread-shaped projections of the push rod which rotates synchronously with the front cylinder advance in the internal threads of the body cylinder and the push rod is fed or retracted. Here, since unevenness sections of the push rod and the front cylinder to synchronously engage the both are formed, the synchronous engagement sections are smoothly engaged, whereby the push rod and the chuck can smoothly be fed or retracted.
In the present invention, it is preferable that the synchronous engagement unevennesses are formed on an entire circumference of the inside surface of the front cylinder. Even if the push rod is built into the front cylinder at any rotating position, the unevennesses of the push rod and the synchronous engagement unevennesses of the front cylinder will be engaged. Thus, alignment is not required at the time of assembly of the push rod, thereby remarkably improving efficiency of the assembly work. Further, even though an unevenness of the push rod is provided at one place, similar effect can be achieved, but to provide a plurality of unevennesses surpasses in strength.
Further, it is preferable that the synchronous engagement unevennesses are formed on an inside surface of a flange provided at a lower part of the internal hole for sliding the chuck of the front cylinder. More specifically, by eliminating any synchronous engagement unevenness or rib from the internal hole in which a cosmetic material slides, a periphery of the cosmetic material is not uneven and friction is reduced when the cosmetic material which is fluid after the assembly is directly filled in the internal hole and solidificated, whereby the cosmetic material can smoothly be fed or retracted.
Further, it is preferable to have the following constitution: the push rod is formed in a manner that the push rod is one with the chuck; at a tail section of the push rod, there are provided bend stoppers which have outward projections projecting over a periphery surface of the push rod; a stopper contact section is provided at a lower part of each internal thread of the body cylinder; when the push rod is passed through the body cylinder at the time of assembly, the bend stoppers bend inward so that the bend stoppers can pass inside the internal threads; and after the assembly, the bend stoppers are restored to an original form; and at the feeding end of the push rod, the bend stoppers come into contact with the stopper contact sections, whereby the feeding limit of the push rod is defined.
In the case of the container for feeding a stick type cosmetic material which directly fills up a cosmetic m

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