CA2037263A1

CA2037263A1 - Liquid painting instrument

Info

Publication number: CA2037263A1
Application number: CA002037263A
Authority: CA
Inventors: Nobuyuki Nakazima
Original assignee: Mitsubishi Pencil Co Ltd
Current assignee: Mitsubishi Pencil Co Ltd
Priority date: 1990-03-02
Filing date: 1991-02-27
Publication date: 1991-09-03
Also published as: GB9104331D0; DE4106386A1; ITMI910545A1; JPH03115076U; GB2243071A; IT1252312B; JP2525538Y2; ITMI910545A0; FR2659031A1

Abstract

LIQUID PAINTING INSTRUMENT
Abstract A liquid painting instrument comprising a front shaft, a valve member, a liquid reservoir and a check valve(s), the liquid reservoir being made of a soft material and accommodated in a chamber of the main shaft communicating with the atmosphere said liquid reservoir opening to a chamber of the main shaft wherein the valve member is provided, and the check valve(s) being provided between the painting piece and the liquid reservoir.

Description

LIQUID P~INTING INSTRUMENT
BACKGROUND OF THE INVENTION
Field of the Inven-tion-The present invention relates to a liquid painting instrument of the type having a painting liquid such as a liquid cosmetic, a liquid hair dye, an ink and a pain-t contained in a main shaf-t and a painting piece fitted on the fron-t shaf-t so that the liquid may be impregnated in the painting piece by knocking at rear end of the main shaft or by pushing the front shaft toward the rear end to paint a desired plane with the painting piece.
Prior Art Such a conven-tional liquid painting instrument of this type is illustrated in Figs. 8-10 and will be described below.
Referring now to said figures, an outer shaft 1 is screwed at the front end in a front shaft 3 which holds a brush 2 at the front end. In the brush 2 is inserted a pipe 4 on which in turn is put a liquid guide pipe 5.
Slidably inserted in the outer shaft 1 is an inner shaft 6 which contains a painting liquid, and between the inner shaf-t 6 and the liquid guide pipe 5 is interposed a packing 7 to prevent the painting liquid from leaking through therebetween.
In close vicinity to -the rear end of the above liquid guide pipe 5, provided in the inner shaft 6 is a valve rod 8 which slides in a guide member 6b of the inner shaf-t 6.
The valve rod 8 comprises a valve portion 8a contactîng a value sea-t 6a of the inne.r shaft 6 to constitute a .

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valve, a piston portion 8b for loading a spring 9 later described in the guide portion 6b of the inner shaft 6, and a skirt portion 8c pendent from the piston portion 8b.
The above spring serves to close the valve with the valve portion 8a pressure-contacted to the valve seat 6a. On knocking a-t a knock portion 6c of the rear end of the inner shaft 6 toward -the front shaft, the pressure of the painting liquid in the inner shaft 6 is eleva-ted with the piston portion 8b left unmoved by the action oE -the liquid guide pipe 5 per se abutted against the valve rod 8, and simultaneously the valve is opened between the valve seat 6a and -the valve portion 8a to discharge -the painting liquid into the liquid guide pipe 5 with the skir-t portion 8c pushed open.
The discharged pain-ting liquid enters the llquid guide pipe 5 through the opening 5a thereof and then impregnated into the brush 2 so that a desired plane may be painted with the brush 2.
Though the painting is thus effected using the painting liquid contained in the inner shaf-t 6, when the knocking at the knock portion 6c of the inner shaft 6 is stopped, then the inner shaft 6 is slided in the outer shaft 1 ; ~ ln a direction contrary to the front shaft 3, energiæed by the spring 9.
And, energized by the spring, the valve por-tion 8a of the valve rod 8 contac~ts the valve seat 6a, so that the ~palnting liquid already discharged may be prevented from ; ~ ~ returning back to the inner shaft 6 whose inner pressure consequently becomes negative.

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Accordingly, when knockings are repeated several -times, the negative pressure increases to result in such possibility that -the amount of the painting liquid impregnated into the brush 2 by a single knocking reduces or becomes nil at least.
Further, -there exists sometimes such possibility that, when the valve is opened by the knocking or closed belatedly, sorne air flows back into the inner shaft 6 to form bubbles in the painting liquid and the bubbles thus formed decrease the amount of the painting liquid o-therwise to be impregnated into the brush 2.
For the purpose of prevention of the decrease in the amount of the painting liquid to be discharged, such a liquid painting instrumen-t has been proposed as shown in Fig. 11.
On this liquid painting instrument, a slidable piston 10 is inserted at the rearward in the inner shaft 6 of the liquid painting instrument illustrated in Figs. 8-10.
~ ccordingly, it is contemplated in this liquid painting instrumen-t that, when -the painting liquid in the inner shaft 6 becomes to a state of nega-tive pressure, the piston 10 is forced to slide in the inner shaft 6 to keep the pressure of the painting liquid equal to the atmospheric pressure so that the amount discharged by one knocking at the knock portion 6c of the inner shaft 6 may be regularized.
However, even with the painting instrument illustrated in Yig. 11, the plston 10 sometimes becomes unslidable with the painting liquid penetrated between -the inner shaft 6 and the .
piston 10 becoming dry or solidified.

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As a result, like with -the liquid painting .instrument of Fig. 8 there s-till exists such drawback that results in the very same problem as i~ the former that the painting liquid in the inner shaft 6 becomes -to the state of negative pressure with the knock portion 6 being knocked at.
The present invention is aimed at the provision of such a liquid painting instrument tha-t is free from the above-described problems with the conventional liquid painting instruments, that is capable of impregnatingthe pain-ting liquid into the painting piece by either of the knocking at the rear end of the main shaft or the pushing of the painting piece holding front shaft rearward, and -that is capable of keeping -the amount of contained painting liquid constant to be discharged without the pressure of the painting liquid becoming to the state of negative pressure even when the painting liquid has solidified or dried as a result of being unat-tended for a long period of time or when the knockings has-been repeated.
SUMMARY OF THF INVENTION
The present invention is concerned with a liquid painting instrumen-t capable of achieving the above aim and comprises accommoda-ting a sof-t liquid reservoir con-taining the painting liquid airtightly in a main shaft that is per se communicating with the atmosphere, slidably inserting the main shaft in a front shaft whose front end holds a painting piece, inserting in the main shaft a liquid gulde pipe which opens to the painting pipe and is fixed to -the front shaft, arranging at the rear end of the liquid gulde pipe a valve member which opens with the main shaf-t sliding towzrd the front shaft, and ' providing a check valve between -the painting piece and the liquld reservoir.
BRIEF DESCRIPTION OF THE INVENTION
Fig. 1 is a sectional view of an embodiment according to the present inventin;
Fig. 2 is a sectional view of a check valve thereof;
Fig. 3 is a perspective view showing other form of the check valve;
Figs. 4-7 are sec-tional views respectively showing other embodiments;
Fig. 8 is a sectional view of a prior art liquid pain-ting instrument;
Fig. 9 is a sectional view at the environs of the valve -thereof;
Fig. 10 is a perspective view of a valve rod;
Fig. 11 is a sectional view of another prior art liquid painting instrument.
DETAILED DESCRIPTION AND THE PREFERRED EMBODIMENTS
With reference to Figs. 1 and 2, an embodiment of the present invention will be described.
Hollow comb teeth ll each having a discharge port lla formed at the front end are fitted in a front shaft 12 by being sandwiched between the front shaft 12 and a handhold shaft 13 with a pipe llb of the base portion thereof communicating with ~; th~e~dlscharge ports lla.
The above pipe 11 is inserted in a liquid guide pipe 14 for a painting liquid introduced through side holes 14a into the liquid guide pipe 14 to be guided to the discharge ports :

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In the handhold shaft 13 is slidably inserted a slide shaf-t 15 in which a main shaft 16 is screwed and between the slide shaft 15 and the main shaft 16 are sandwiched a packing 17, a valve seat 18 and a valve guide 19.
The packing 17 is put on the liquid guide pipe 14 inserted in -the valve seat 18 to prevent the painting liquid from leaking through the outer peripheral face of the li~uid guide pipe 14.
The valve seat 18 constitutes a valve toge-ther with a valve portion 20a of a valve rod 20 which is slidably inserted in the valve guide 19, and between a pis-ton 20b of the valve rod 20 and the valve guide l9 is loaded a spring 21 which pushes the valve portion 20a against the valve seat-18 to close the valve.
; On an outer periphery of the main shaft 16 is formed such a stepped portion 16a that abuts against a stepped portion 13a of the handhold shaft 13, when the main shaft 16 is pushed toward the front shaft 12, lest -the main shaft 16 should be pushed further.
Meanwhile, the main shaf-t 16 is provided ln the inside thereof with a partition wall 16d which separates a valve guide chamber 16b which accommodate the valve guide 19 from an accommodation chamber 16c in the main shaft 16. The accommodation chamber 16c receives therein a liquid reservoir 22; which is made of a sof-t material such as a plastics or a metal foil so that it may deformed.
This liquid reservoir 22 contains the painting liquid 6 - ~

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ancl is screwed through a check valve 20 in the partition wall 16d.
Further, the accommodation chamber 16c is ventilably closed by a tail plug 24 which is provided with a ventilation hole 24a.
The above check valve 23 is arranged to open or clsoe a communicatio~ hole 23 by means o~ a hinged valve 23a, and, when a negative pressure takes place on the side of the hinged valve 23a, the latter is opened by the negative pressure, thereby allowiny the liquid to flow through the communication hole 23b into the side of the hinged valve 23a.
While, when the side of the communication hole 23b becomes negative pressured, the hinged valve 23a is pushed to close the communication hole 23b thereby preventing the liquid from flowing -through the hole 23b.
Now, operation of this liquid painting instrument will be described below.
~ hen the main shaft 16 is knocked at the tail plug 24 toward the front sha~t 12 or when -the handhold shaft 13 is pushed toward the tail plug 24, then the main shaft 16 moves toward -the comb teeth 11 and the valve rod 20 abuts against the ~tip of the liquid~guide pipe 14.
Thus, the valve rod 20 is pushed resisting against the~
spring~21 an~d the valve is enforced to open between the valve , portion 20a of~the valve rod 20 and the valve seat 18.

At the~same time, the painting liquid in the~valve guide chamber 16b of the main shaft 16 is pressured by the plston portion ZOb of the valve rod 20 to close the hinged 7 ~

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valve 23a of the check valve 23, and the painting liquid in the valve guide chamber 16b flows throughbetween -the valve portion 20a and -the valve seat 18 and through the side holes 14a into the liquid guide pipe 14 and is discharged from the discharge port lla of the comb teeth 11 through -the pipe portion llb.
Thus, hair coloring can be performed by combing the hair while discharging the painting liquid, or the liquid hair dye, from the discharge port lla.
When the knocking at the taiil plug 24 or the pushing of the handhold shaft 13 is released, the main shaft 16 is pushed back in -the direc-tion away from the front shaft 12, with the valve guide 19 pushed by -the energizing force of the spring 21 aggainst the piston 20b of the valve rod 20.
And, when the valve portion 20a contacts the valve seat 19 to close the valve, the piston 20b moves at the sametime to make the pressure in the valve guide chamber 16b negative and thus the check valve 23 is opened.
Since the accommodation chamber 16c is maintained at atmospheric pressure through the ventilation hole 24a of the tail plug 24 and the painting liquid in the liquid reservoir 22 is under a negative pressure influenced by the neagtive pressure in the valve guide chamber 16b, the liquid reservoir 22 is depressed by the atmospheric pressure to shift the painting liquid therein into the valve guide chamber 16b and thus supplement of the discharyed painting liquid can be effected.
Thus, arranged such that the inside of tne valve gulde ~chamber 16b does~not become negative pressured and air flowing - 8 - ~

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backward through the comb teeth 11 is prevented from entering the valve guide chamber 16 -to produce buddles in the painting liquid or no negative pressured s-tate is kept, there is contemplated for the painting liquid to be discharged everytime at a constant a~ount.
In this embodiment, the check valve 23 may be of such form as illustrated in Fig. 3 that has a bowl-like bulge portion 23c formed on one side face thereof and provided with a plurality of radial cu-ts 23d.
This check valve 23 allows the liquid to flow into the bulged side with the cuts 23d opened to that side when the bulged side of the bulge por-tion 23c becomes negative pressured.
However, when the din-t side becomes negative pressured, the cuts 23d closely contact with each other to prevent the liquid from flowing into the negative pressured side.
Another embodiment of the prevent invention is illustrated in Fig;. 4.
In th1s embodiment, the check valve 23 is arranged between -the liquid guide pipe 14 an~ the comb tee-th 11.
; This check valve Z3 allows the painting liquid to be discharged into the comb t0e-th 11 with the hinged valve 23a opened when the tail plug 24 is knocked at or the handhold shaft 13 is pushed toward the tail plug 24.
However, in case where the valve guide chamber 16b becomes negative pressured~when the main shaft 16 re~turns with the knocking or pushing released, the check valve 23~is closed g ~

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, so that the alr from the comb teeth 11 may be prevented from entering the valve guide chamber 16b.
Further, in th'is embodiment, a lever 13b is projectingly provided on one side of the handhold sha~-t 13, and by putting a finger thereon, the pushing of -the front shaft 12 -toward the tail plug 24 can be facilitated.
In a fur-ther embodiment illustrated in Fig. 5, the check valve 23 of the embodiment in Fig. 1 is incorporated in the embodiment of Fig. 4, and the action of this check valve 23 is entirely the same as described with respect to the embodiment of Fig. 1 and so a further description thereon is omi-tted.
Other embodiment shown in Fig. 6 is one of the embodiment of Fig. 1 wherein the lever 13b shown in the embodiment of Fig. 4 is added, and since the action and effect of the lever 13b are the same as in the descrip-tion of the embodiment of Fig. 4, description thereon is omitted.
A still ~ur-ther embodiment illustrated in Fig. 7 is one of the embodiment of Fig. 1 wherein the comb tee-th 11 is replaced with a penpoint 25 such as a brush.
In this embodiment, the base end collar portion 25a of the penpoint 25 is fastened to the front shaft 12 and the handhold shaft 13 with a holding piece 26 and the base end collar portion 14a of the liquid guide pipe 14 sandwiching when the handhold shaft 13 is screwed in the Eront shaft 12.
And, a pipe 27 inserted in the penpoint 25 extends in the liquid guide pipe so that the painting li~uid may be guided through the li~uid guide pipe 14 to the penpoint 25.

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' ' ' 1 d The lever 13b is also provided on one side of the handhold shaft 13 as in the embodiment of Figs. ~-6, and since other construction is the same as that of the embodiment of Figs. 1, 6 except that the penpoint 25 is used for painting purpose, a further description -thereon is omitted.
According to the present invention thus constructed, it is possible for the painting liquid to be discharged to the painting piece not only by knocking at the rear end of the main shaft bu-t also by pushing the front shaft rearward.
As a result, it is convenient in use since the discharging o-E the painting liquid is possible even while holding -the front shaft.
Further, since the supplement of -the painting liquid discharged Erom the main shaft is performed with the soft liquid reservoir deformed under the atmosphic pressure, the painting liquid in the main shaft or the liquid reservoir does not become negative pressured and accordingly the amount oE the painting liquid to be subsequently discharged is not decreased.
Furthermore, the check valve preven-ts the painting liquid in the main shaft from becoming negative pressured or any air through the painting piece from flowing back into the painting liquid to result in generating of buddles therein, so that there exists no decrease in the amount of the discharged painting liquid which otherwise ta]ces place with -the volume of the air decreased when the painting liquid is presurized.
Moreover, there i5 employed the soft liquid reservoir made oE a soft material such as a plastics and a metal foil in place of the prior art piston which moves according -to the :

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decrease o~ the painting liquid so that the liquid reservoir may be depressed under the atmosphic pressure, the present invertion provides such advantage that the problems derived when the painting liquid becomes dried or solidified can be completely eliminated.

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Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

liquid painting instrument comprising a front shaft (12) provided on the front end with a painting piece, a main shaft (16) slidably inserted in the front shaft (12) and receiving therein a liquid guide pipe (14) which is open to the painting piece, a valve member arranged in the main shaft to be released when the main shaft slides toward the front shaft, a liquid reservoir (22) for containing a painting liquid, made of a soft material and accommodated in a chamber of the main shaft communicating with the atmosphere said liquid reservoir opening to a chamber of the main shaft wherein the valve member is provided, and a check valve(s) (23) provided between the painting piece and the liquid reservoir.