GB2229791A - A piston for discharging liquid from a liquid applicator - Google Patents

A piston for discharging liquid from a liquid applicator Download PDF

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Publication number
GB2229791A
GB2229791A GB9004325A GB9004325A GB2229791A GB 2229791 A GB2229791 A GB 2229791A GB 9004325 A GB9004325 A GB 9004325A GB 9004325 A GB9004325 A GB 9004325A GB 2229791 A GB2229791 A GB 2229791A
Authority
GB
United Kingdom
Prior art keywords
piston
reservoir
liquid
wall
applicator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB9004325A
Other versions
GB9004325D0 (en
GB2229791B (en
Inventor
Toru Nagai
Nobuyuki Nakajima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Pencil Co Ltd
Original Assignee
Mitsubishi Pencil Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Pencil Co Ltd filed Critical Mitsubishi Pencil Co Ltd
Publication of GB9004325D0 publication Critical patent/GB9004325D0/en
Publication of GB2229791A publication Critical patent/GB2229791A/en
Application granted granted Critical
Publication of GB2229791B publication Critical patent/GB2229791B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/01—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes with manually mechanically or electrically actuated piston or the like
    • B05C17/0116—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes with manually mechanically or electrically actuated piston or the like characterised by the piston driving means
    • B05C17/0133—Nut and bolt advancing mechanism, e.g. threaded piston rods
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D40/00—Casings or accessories specially adapted for storing or handling solid or pasty toiletry or cosmetic substances, e.g. shaving soaps or lipsticks
    • A45D40/02—Casings wherein movement of the lipstick or like solid is a sliding movement
    • A45D40/04—Casings wherein movement of the lipstick or like solid is a sliding movement effected by a screw
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D40/00—Casings or accessories specially adapted for storing or handling solid or pasty toiletry or cosmetic substances, e.g. shaving soaps or lipsticks
    • A45D40/26—Appliances specially adapted for applying pasty paint, e.g. using roller, using a ball
    • A45D40/262—Appliances specially adapted for applying pasty paint, e.g. using roller, using a ball using a brush or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/002—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces with feed system for supplying material from an external source; Supply controls therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K5/00—Pens with ink reservoirs in holders, e.g. fountain-pens
    • B43K5/02—Ink reservoirs
    • B43K5/06—Ink reservoirs with movable pistons for withdrawing ink from an ink-receptacle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/001—One-piece pistons
    • F16J1/003—One-piece pistons with integral sealing lips
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D2200/00—Details not otherwise provided for in A45D
    • A45D2200/05—Details of containers
    • A45D2200/054—Means for supplying liquid to the outlet of the container
    • A45D2200/055—Piston or plunger for supplying the liquid to the applicator

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Coating Apparatus (AREA)
  • Pens And Brushes (AREA)

Abstract

A piston for pushing liquid out of a reservoir of a liquid applicator such as a writing instrument has two circular walls (3,3a) which seal against the inner surface of the reservoir (1). One of the walls (3) is shaped to permit the piston (4) to be advanced. The other wall (3a) forms an angle of from 90 DEG to 135 DEG between its axially inner face and the inner surface of the reservoir (1). This ensures that, if an attempt is made to retract the piston (4), the wall (3a) frictionally binds with the inner surface of the reservoir (1) to prevent retraction. Thus, there is no need for a metal disc, as in the prior art, to prevent retraction (see Fig. 3). Also, the piston (4) may be made of plastics material which will not scratch the reservoir (1), thus permitting refilling and reuse of the reservoir (1). <IMAGE>

Description

A A PISTON FOR DISCHARGING LIQUID FROM A LIQUID APPLICATOR The present
invention relates to a piston for discharging liquid from a liquid applicator such as a painting or writing instrument and more particularly it relates to a piston for fitting within a reservoir of a liquid applicator containing a liquid such as a writing or correction ink, a liquid cosmetic, paint, adhesive or liquid medicament. The piston is used to push the liquid out of the reservoir and incorporates a reverse motion prevention feature.
conventional piston of this type is illustrated in Fig. 3.
plastic piston 4 has flared sealing ends 3 which form a shallow angle with the inner surface of a cylindrical chamber 2 of a reservoir 1 The piston 4 by itself can be slid along the chamber 2 in both directions.
A metal plate 5 is attached to the back of the piston 4 and has a surface which acts on the inner surface of the cylindrical chamber 2 so as to prevent the piston 4 from being moved in a reverse direction. The piston 4 is only able to move in a forward direction, indicated by the arrow in Figure 3.
The conventional piston using a metal plate 5 has proved disadvantageous in terms of high production costs resulting from increased assembly complexity and parts and components. What is more disadvantageous, the metal plate 5 causes the inner surface of the cylindrical chamber 2 of the reservoir 1 to be scratched and prevents the reservoir 1 from being reused.
According to the present invention, there is provided a piston for discharging liquid from a liquid applicator, the piston having a central body and two annular walls projecting from opposite ends thereof, each wall being flared in the direction away from the body, the free ends of the walls defining an axis of the piston along which, in use, the piston moves along a reservoir of the liquid applicator and one of the walls having, when viewed in a cross-section along said axis, an included angle between its axially inner face and said axis that is in the range from 450 to 9011. This equates to the axially inner face of the one wall f:)rming, in use, an angle in the range from 1350 to 900 with the inner surface of the reservoir of the liquid applicator. The angle of the axially inner face ensures that the one wall binds against the inner surface of the reservoir if it is attempted to move the piston with the one wall ahead of the other wall. In practice, this equates to trying to retract the piston.
The other wall may therefore have, when viewed in cross-section along the same axis, an included angle between its axially inner face and the said axis which is small enough, as in the prior art, to permit the piston to be advanced down the reservoir. In other words, the piston itself permits itself to be advanced but not retracted. This leads to a saving of cost and reduction in complexity compared with the prior art (Fig. 3). The included angle will be greater than 1351, e.g. greater than 1450, 1550, 16501 1750 or even 1850.
A suitable resilient material for the piston to prevent scratching of the inner surface of the reservoir is plastics material.
Usually, each wall will be circular.
The invention will now be described by way of non-limiting example with reference to the accompanying drawings, in which:- Fig. 1 shows a longitudinal section of a manicuring device utilizing a piston in accordance with the present invention; Fig. 2 shows a longitudinal section of the part of the device of Fig. 1 incorporating the piston; and Fig. 3 is similar to Fig. 2 but shows a conventional piston.
Referring now to Figures 1 and 2, a piston 6 is fitted within a reservoir 1 containing a manicure fluid 7 so as to slide freely towards the tip of the instrument in order to push out the f luid 7 onto a brush 8 attached to the said tip of the instrument.
A screw-threaded rod 9 is attached perpendicularly to the back of the piston 6 and is not rotatable. The rod 9 passes through an aperture 11 in a stopper 10. The rod 9 is screw-threadedly engaged with a tubular member 12 so as to be movable forwards (to the left in Fig. 1) by rotating a knob 13.
A polyethylene piston 6 molded as a whole has, as illustrated in Fig. 2, circular walls 3 and 3a projecting from opposite faces of a central body. The walls 3, 3a are flared so that their free ends engage the inner -i surface of a cylindrical chamber 2 of the reservoir 1. The axially inner face of the wall 3a forms an angle of 1201 with the inner surface of the cylindrical chamber 2 of the reservoir 1. The angle can range from 900 to 1350.
If the piston is retracted (moved to the right in Figs. 1 and 2), the wall 3a is forced to extend laterally by the friction generated. This prevents the retraction from occurring. However, if the piston is moved forwards (to the left in Figs. 1 and 2: in the direction of the arrow) the wall 3 forms two shallow an angle with the inner surface of the reservoir 1 to prevent the forward motion. If the angle of the wall 3a falls outside the range of 900 to 1350, the binding force between the tip of the wall and the inner surface of the reservoir 1 is too small to prevent retraction of the piston.
1

Claims (5)

1. A piston for discharging liquid from a liquid applicator, the piston having a central body and two annular walls projecting from opposite ends thereof, each wall being flared in the direction away from the body, the free ends of the walls defining an axis of the piston along which, in use, the piston moves along a reservoir of the liquid applicator and one of the walls having, when viewed in a cross-section along said axis, an included angle between its axially inner face and said axis that is in the range from 4511 to 900.
2. A piston according to claim 1, wherein the body is made of plastics material.
3. A piston according to claim 1 or claim 2, wherein each wall is circular.
4. A piston for discharging liquid from an applicator, substantially as herein decribed with reference to Figures 1 and 2 of the accompanying drawings.
5. All novel features and combinations thereof.
Published 1990atThe Patent Oftice. State House-6671 High Holborn, LondonWC1R4TP-Flj--ther copies maybe obtained Com The Patent =ice Was Branch, St Mary Cray. Orpington, Kent BR5 3RD. Printed by Multiplex techniques ltd. St Mary Cray. Kent. Con 1187
GB9004325A 1989-02-27 1990-02-27 A piston for discharging liquid from a liquid applicator Expired - Fee Related GB2229791B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1989021768U JPH02112380U (en) 1989-02-27 1989-02-27

Publications (3)

Publication Number Publication Date
GB9004325D0 GB9004325D0 (en) 1990-04-25
GB2229791A true GB2229791A (en) 1990-10-03
GB2229791B GB2229791B (en) 1992-11-25

Family

ID=12064252

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9004325A Expired - Fee Related GB2229791B (en) 1989-02-27 1990-02-27 A piston for discharging liquid from a liquid applicator

Country Status (7)

Country Link
JP (1) JPH02112380U (en)
KR (1) KR920008449Y1 (en)
CA (1) CA2010892A1 (en)
DE (1) DE4005856A1 (en)
FR (1) FR2643576A1 (en)
GB (1) GB2229791B (en)
IT (1) IT1239348B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5803640A (en) * 1996-06-04 1998-09-08 Mitsubishi Pencil Kabushiki Kaisha Applicator
US5851079A (en) * 1996-10-25 1998-12-22 The Procter & Gamble Company Simplified undirectional twist-up dispensing device with incremental dosing
US11116306B2 (en) 2016-09-26 2021-09-14 Dyson Technology Limited Cleaning appliance

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4596675B2 (en) * 2001-05-08 2010-12-08 株式会社パイロットコーポレーション Valve member of liquid suction mechanism
JP5338157B2 (en) * 2008-06-30 2013-11-13 ぺんてる株式会社 Writing instrument
DE202008015128U1 (en) * 2008-11-14 2010-04-08 H. & M. Gutberlet Gmbh Cosmetic or pen

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB337344A (en) * 1929-04-27 1930-10-27 John Wesley Mcquaid Pistons
GB572055A (en) * 1944-02-08 1945-09-20 Angus George Co Ltd Improvements in cup washers
GB691598A (en) * 1950-02-22 1953-05-20 Thomas Boorn & Company Ltd Improvements in and relating to pump pistons
GB768713A (en) * 1954-07-23 1957-02-20 Hulie Emery Bowerman Improvements in or relating to piston sealing arrangements
GB887936A (en) * 1958-11-11 1962-01-24 Maquinaria Petrolifera S A Pump piston
GB2033537A (en) * 1978-10-31 1980-05-21 Festo Maschf Stoll G Piston for pneumatic actuator
GB1579677A (en) * 1977-06-29 1980-11-19 Wickman Lang Ltd Pistons

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2040999A (en) * 1935-05-27 1936-05-19 Conklin Pen Company Fountain pen
FR916524A (en) * 1945-06-19 1946-12-09 Refill Pump Pen Improvements
DE1101217B (en) * 1957-06-21 1961-03-02 Helmut Bross Dipl Ing Fountain pen with main and reserve ink space
FR2203476A5 (en) * 1972-10-18 1974-05-10 Commissariat Energie Atomique
DE3881772T2 (en) * 1987-07-20 1993-10-07 Intellectual Property Holding Seal for a dispenser tube.

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB337344A (en) * 1929-04-27 1930-10-27 John Wesley Mcquaid Pistons
GB572055A (en) * 1944-02-08 1945-09-20 Angus George Co Ltd Improvements in cup washers
GB691598A (en) * 1950-02-22 1953-05-20 Thomas Boorn & Company Ltd Improvements in and relating to pump pistons
GB768713A (en) * 1954-07-23 1957-02-20 Hulie Emery Bowerman Improvements in or relating to piston sealing arrangements
GB887936A (en) * 1958-11-11 1962-01-24 Maquinaria Petrolifera S A Pump piston
GB1579677A (en) * 1977-06-29 1980-11-19 Wickman Lang Ltd Pistons
GB2033537A (en) * 1978-10-31 1980-05-21 Festo Maschf Stoll G Piston for pneumatic actuator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5803640A (en) * 1996-06-04 1998-09-08 Mitsubishi Pencil Kabushiki Kaisha Applicator
US5851079A (en) * 1996-10-25 1998-12-22 The Procter & Gamble Company Simplified undirectional twist-up dispensing device with incremental dosing
US11116306B2 (en) 2016-09-26 2021-09-14 Dyson Technology Limited Cleaning appliance

Also Published As

Publication number Publication date
JPH02112380U (en) 1990-09-07
GB9004325D0 (en) 1990-04-25
IT1239348B (en) 1993-10-20
IT9019493A0 (en) 1990-02-27
KR920008449Y1 (en) 1992-11-30
DE4005856A1 (en) 1990-08-30
IT9019493A1 (en) 1991-08-27
CA2010892A1 (en) 1990-08-27
GB2229791B (en) 1992-11-25
FR2643576A1 (en) 1990-08-31

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940227