GB2228555A

GB2228555A - Paint delivery device

Info

Publication number: GB2228555A
Application number: GB9001840A
Authority: GB
Inventors: Giuseppe Sindoni
Original assignee: Italtinto Srl
Current assignee: Italtinto Srl
Priority date: 1989-01-26
Filing date: 1990-01-26
Publication date: 1990-08-29
Anticipated expiration: 2010-01-26
Also published as: NL9000173A; FR2641990A3; IT215555Z2; IT8920484V0; GB2228555B; GB9001840D0; BE1003090A3; FR2641990B3; DE9000777U1

Abstract

Paint flows from a storage container (3), into an inlet duct (2), through a chamber (5) and out of an outlet duct (6). A pneumatic piston (9) moves a rod (8) so that a pair of tips (10, 12) can regulate the flow of paint through the chamber (5). A scraper blade (15) moves with the rod (8) to close off the outlet of the outlet duct (8) when the tips (10, 12) have been moved to stop paint flow. In this way, the paint remaining in the outlet duct (6) is prevented from drying up. The components that come into contact with the paint are housed in a removable head (4) to permit easy cleaning. <IMAGE>

Description

PAINT DELIVERY DEVICE The present invention relates to a paint delivery device. The device is particularly suitable for use in metering apparatuses such as, for example, the one disclosed in Italian Patent No. 1,101,064.

Dispensing systems are well known. In paint dispensing machines there is a duct for delivering the paint and the duct is connected to metering apparatus and sealed by means of a packing fixed to the stem of a pneumatic piston or other similar component.

These dispensers have, however, some disadvantages mainly due to the fact that the sealing means of the dispenser is placed in the discharge duct, this involving a certain lack of precision in the amount of material delivered, part of which remains in the duct where, in the long run, it dries up, thus blocking the duct.

This necessitates frequent maintenance operations of cleaning the dispenser, these operations being complicated by the fact that in the presently known dispensers it is not possible to disassemble only their end portion for cleaning, so that rather costly operations are required.

According to a first aspect of the present invention, there is provided a device for delivering paint, comprising a piston, means for controlling the movement of the piston and a rod movable by the piston and provided with a closure tip for regulating the delivery of paint.

According to a second aspect of the present invention, there is provided a device for delivering paint, comprising a chamber having an outlet communicating with a paint discharge duct and an inlet connectable to a container of paint, means for regulating flow through the chamber and means for sealing the outlet of the discharge duct in response to said regulating means stopping the flow through the chamber.

According to a third aspect of the present invention, there is provided a device for delivering paint, comprising: a delivery head inside which there is provided a chamber having an inlet connectable to paint supply means and an outlet communicating with a discharge duct; a piston; a rod movable by the piston and having a tip located in the chamber for regulating flow through the chamber; and a blade connected to the rod and movable therewith to seal the outlet of the discharge duct.

In one embodiment, a dispenser is provided with means suitable for hermetically sealing the outlet of the discharge duct and wherein the end portion of the dispenser, where this duct is placed, can be easily disassembled to make the cleaning easy, thus making the device substantially more practical. In particular, the dispenser includes a pneumatic piston the movements of which are controlled by means of a microprocessor, said piston moving a rod on which there is mounted a packing for hermetically sealing the duct connecting the chamber to the paint delivery means. Moreover a blade is provided, connected to the rod, for sealing the paint delivery opening so that, when the system is in its closed position, the paint left in the discharge duct is prevented from drying up.The system is provided with a removable head in which the discharge duct is located, so that all the parts that are in contact with the paint can be easily and directly reached for efficient and effective cleaning, simply by disassembling the head of the dispenser. There are provided means, moved by springs, for assuring the hermetic sealing of the system even when the pneumatic force acting on the piston fails for some reason.

The present invention will now be described by way of non-limiting example with reference to the accompanying figure, which illustrates, schematically, a section through a dispenser in accordance with the invention.

The dispenser includes a body 1 inside which there are adapting devices and which has, in a front portion of a head, a duct 2 connected to an uppermost paint container 3.

The paint passes from the container 3 into the duct 2.

An extrusion head 4 is removably fastened to the body 1. Inside the head 4 there is a substantially cylindrical chamber 5, communicating with the duct 2 on one side and with a discharge duct 6 on the other side.

In its front part, the chamber 5 has tapered walls 7. Inside the body 1, a rod 8 of a pneumatic piston 9 is slidably mounted. On the rod 8 a tip 10 is mounted which can slide along rod 8 and which is biassed towards the front portion of the dispenser (towards the right in the figure) by biassing means such as a helicoidal spring 11.

The movement of the rod 8 caused by the piston 9 moves the tip 10 from a position such as the one illustrated in the figure, where the tip abuts against the wall of the dispenser, thus blocking communication between the chamber 5 and the duct 2, to a second position, illustrated in the detail of the same figure, where it allows free passage of the paint from the duct 2 to the chamber 5. At the front end of the rod 8 there is a further sealing member 12 which, when the device is in the closed position, abuts against the tapered walls 7, thus preventing any communication between the discharge duct 6 and the chamber 5. The rod 8 is also subjected to the action of a helicoidal spring 13 designed to push it to the right, into the closed position of the device.To the rod 8 is fastened a support 14 of a blade 15, e.g. made of steel, which moves together with the rod 8 and opens and closes the external opening of the discharge duct 6.

To allow delivery of paint from the container 3, the pneumatic piston 9 is moved so as to move the rod 8 to the left. The head member 12 is retracted from the tapered walls 7 and the tip 10 also retracts, allowing the paint to flow along the duct 2, into the chamber 5 and into the discharge duct 6.

At the same time as the rod 8 is moved, the support 14 and with it the blade 15 also move allowing the paint to be discharged.

At the end of the discharge operation, the piston is moved again, returning the system to its starting position, at which the tip 10 seals the chamber 5, head member 12 abuts against the wall 7 and the blade 15 seals the duct 6.

In the event of failure or imprecise functioning of the pneumatic piston, the spring 13 keeps the rod 8 in its closed position. The present invention provides an extremely precise delivery system for paints in terms of measuring the amount of paint delivered. It is also extremely practical and clean because the action of the blade 15 ensures that leakage of the paint and drying up of the paint in the delivery duct after delivery is prevented.

In case there is need to clean the dispenser or to carry out maintenance operations, it is enough merely to remove the head 4 in order to be able to carry out such operations comfortably and in the most convenient conditions.

The sizes as well as the materials used can vary according to the usage requirements.

Claims

1. A device for delivering paint, comprising a piston, means for controlling the movement of the piston and a rod movable by the piston and provided with a closure tip for regulating the delivery of paint.

2. A device according to claim 1, further comprising a blade connected to the rod and movable therewith to seal the outlet of a discharge duct.

3. A device according to claim 2, wherein the paint discharge duct is detachable from the rest of the device.

4. A device according to any one of the preceding claims, further comprising biassing means for biassing the rod to close off the flow of paint.

5. A device for delivering paint, comprising a chamber having an outlet communicating with a paint discharge duct and an inlet connectable to a container of paint, means for regulating flow through the chamber and means for sealing the outlet of the discharge duct in response to said regulating means stopping the flow through the chamber.

6. A device according to claim 5, wherein the chamber has, adjacent to the discharge duct, a tapered wall and the regulating means comprises a rod having a tip movable into and out of engagement with the wall to regulate the flow through the chamber.

7. A device for delivering paint, comprising: a delivery head inside which there is provided a chamber having an inlet connectable to paint supply means and an outlet communicating with a discharge duct; a piston; a rod movable by the piston and having a tip located in the chamber for regulating flow through the chamber; and a blade connected to the rod and movable therewith to seal the outlet of the discharge duct.

8. A device according to claim 7, wherein the tip is slidably mounted on the rod and biassing means are provided for biassing the tip to stop the flow through the chamber.

9. A device according to claim 7 or claim 8, further comprising biassing means for biassing the rod to close off the flow of paint in the event of failure of the piston.

10. A device for delivering paint, substantially as herein described with reference to the accompanying drawings.

11. All novel features and combinations thereof.