Piston for dispensing a flowable component from a cartridge

Patent metadata

Field	Value
Publication number	US-2016288159-A1
Application number	US-201415036842-A
Country	US
Kind code	A1
Filing date	Oct 8, 2014
Priority date	Nov 18, 2013
Publication date	Oct 6, 2016
Grant date	—

Abstract

A piston for dispensing a flowable component from a cartridge includes a piston having a base body and a venting element. The base body has a passage connecting a component side and an actuation side and has a passage opening. The venting element has an internal connection element and a pin which is partly arranged in the passage opening of the base body. The internal connection element and the pin are connected by a spring element. The pin of the venting element can adopt a sealing position and an aerating position. To enable a secure sealing, the spring element is configured such that it includes an angle of a maximum of 80° with the axial direction in the sealing position of the pin at a connection line to the internal connection element in the direction of an actuation side.

First claim

1 . A piston for dispensing a flowable component from a cartridge, the piston comprising
a base body; and a venting element, the base body having a component side, an actuation side and a passage connecting the component side and the actuation side and having a passage opening; the venting element having
an internal connection element by which the venting element is connected to the base body, a pin arranged at least partly in the passage of the base body, and
a spring element connecting the internal connection element and the pin, and which is connected to the internal connection element along a connection line,
the pin of the venting element
configured to adopt
a sealing position in which the pin is aligned along an axial direction and the passage opening is closed in an airtight manner, and
an aerating position in which an exchange of air is capable between the component side and the actuation side via the passage,
the venting element being arranged and configured such that the spring element is configured to urge the pin into the sealing position, and the spring element being configured to include an angle of a maximum of 80° with the axial direction in the sealing position of the pin at the connection line to the internal connection element in the direction of the actuation side.

2 . The piston in accordance with claim 1 ,
wherein the angle is between 65° and 75°.

3 . The piston in accordance with claim 2 ,
wherein the angle is between 69° and 71°.

4 . The piston in accordance with claim 1 ,
wherein the spring element has a frustoconical contour in a region of the connection line to the internal connection element.

5 . The piston in accordance with claim 1 ,
wherein the internal connection element has a predominantly cylindrical base shape and is connected to the base body via an internal latch connection.

6 . The piston in accordance with claim 5 ,
wherein the internal latch connection has a first recess and a second recess and corresponding first and second dimples, with the first and second recesses being arranged spaced apart in the axial direction.

7 . The piston in accordance with claim 1 ,
further comprising an external connection element by which the venting element is connected to the base body, with the internal connection element being arranged between the external connection element and the pin.

8 . The piston in accordance with claim 1 ,
wherein the base body and the venting element are manufactured by an injection molding process.

9 . The piston in accordance with claim 8 ,
wherein the base body and the venting element comprise different materials.

10 . The piston in accordance with claim 2 , wherein
the spring element has a frustoconical contour in a region of the connection line to the internal connection element.

11 . The piston in accordance with claim 3 , wherein
the spring element has a frustoconical contour in a region of the connection line to the internal connection element.

12 . The piston in accordance with claim 2 , wherein
the internal connection element has a predominantly cylindrical base shape and is connected to the base body via an internal latch connection.

13 . The piston in accordance with claim 3 , wherein
the internal connection element has a predominantly cylindrical base shape and is connected to the base body via an internal latch connection.

14 . The piston in accordance with claim 4 , wherein
the internal connection element has a predominantly cylindrical base shape and is connected to the base body via an internal latch connection.

15 . The piston in accordance with claim 2 , further comprising
an external connection element by which the venting element is connected to the base body, with the internal connection element being arranged between the external connection element and the pin.

16 . The piston in accordance with claim 3 , further comprising
an external connection element by which the venting element is connected to the base body, with the internal connection element being arranged between the external connection element and the pin.

17 . The piston in accordance with claim 4 , further comprising
an external connection element by which the venting element is connected to the base body, with the internal connection element being arranged between the external connection element and the pin.

18 . The piston in accordance with claim 5 , further comprising
an external connection element by which the venting element is connected to the base body, with the internal connection element being arranged between the external connection element and the pin.

19 . The piston in accordance with claim 6 , further comprising
an external connection element by which the venting element is connected to the base body, with the internal connection element being arranged between the external connection element and the pin.

Assignees

• Sulzer Mixpac Ag

Inventors

• Seifer Ralf

Classifications

• B05C17/00559

  the different components being stored in coaxial chambers · CPC title

• B05C17/00579 Primary

  comprising means for allowing entrapped air to escape to the atmosphere · CPC title

• B05C17/00553

  with means allowing the stock of material to consist of at least two different components · CPC title

• B65D2205/04

  for venting during the initial insertion of a piston · CPC title

• B05C17/01

  with {manually} mechanically or electrically actuated piston or the like {(B05C17/00533 takes precedence)} · CPC title