TECHNICAL AREA The present invention refers to a dispenser for dispensing plastic material from at least one cylindrical container unit, said dispenser comprising a carrier with at least one manoeuvrable piston rod, which is connected to means for displacing the rod when dispensing said material, and a holder for mounting the container unit in a fixed position for use, which position is coaxial with the longitudinal axis of the piston rod, which holder is provided with valve means for opening or closing a feed out opening for said material.

BACKGROUND OF THE INVENTION

Dispensers for plastic material can for example be used for dispensing two-component putty, which for instance can be used in car garages when repairing collision damages, before lacquering.

Said putty is available in different qualities, from coarse to fine putty. The putty is supplied in a cylindrical container, whose bottom is displaceable in the longitudinal direction of the cylinder, so that the putty compound can be pressed out through an opening at the opposite end of the cylinder. A dispenser for dispensing such putty is provided with a screw attachment for the container, and means for displacing a piston rod which drives the bottom of the container ahead. The putty is often of a two-component type, whereby an amount of hardener, which is directly propor¬ tional to the amount of putty, is dispensed simultaneously with the help of a second piston rod arranged in parallel with the first rod.

These dispensers must be designed rather strong in order to resist the forces required to press out the viscous putty.

Putty dispensers are consequently usually units that are fixed to the wall, of which two or more normally are needed in a workshop, in order to provide both coarse and fine putty.

A dispenser fixed to the wall is difficult to clean from dispensed putty, which remains at the feed out opening. A common problem is therefore, that remaining remnants of old, slowly drying putty are to be found in the feed out opening area. If such old putty is mixed into a batch of fresh putty, the result of the puttying will be poor. If the batch of putty is rejected as unfit for use, this will lead to economical consequences since the price per kilogram of putty is relatively high. Alternatively, if a batch of putty is used which contains hard lumps of old putty, this will lead to an increase of the job time, required to attain a perfect puttying result.

Problems also arise when the old putty emigrates and comes into contact with hardener paste, which can result in that the dispenser becomes unfit for use, at least temporary.

It is consequently necessary to clean each putty dispenser regularly in order to avoid problems with old putty. As the construction is fixed to the wall, it will be difficult to dismount the dispenser, and the cleaning therefore takes place in situ, which usually causes spreading of volatile solvents within the workshop.

THE TECHNICAL PROBLEM

The purpose of the present invention is therefore to provide a putty dispenser, being more comfortable and easier to keep clean, and also to obtain an environmentally better working situation.

THE SOLUTION

For this purpose the holder forms a unit with the valve device, said unit being detachable from the carrier. According to this solution one and the same dispenser can be used for different types of putty.

Further variants of the invention will be clear from the subsequent claims.

DESCRIPTION OF THE DRAWINGS

The invention will now be described with references to an embodiment shown in the enclosed drawings, in which Fig. 1 is a planar view showing a dispenser accor¬ ding to the invention seen from the front, Fig. 2 shows the dispenser in Fig. 1 in a side- elevation, with an extra replaceable holder, and Fig. 3 shows the replaceable holder seen from below.

DESCRIPTION OF AN EMBODIMENT

The dispenser according to the invention is useful for different types of plastic material. The dispenser shown in the drawings is specially designed to provide putty of two- component type.

The putty is supplied in a cylindrical cartridge container 10, provided with a neck portion 11 at its feed out end, having an outer screw thread. The opposite end of the cartridge container 10 is provided with a bottom which is displaceable in the longitudinal direction of the cylinder, so that the putty compound can be pressed out through the neck opening 11 at the opposite end of the cylinder. The hardener is supplied in a tube-shaped container 12.

The dispenser includes a carrier 13 and a detachably arranged holder 14. The carrier includes a L-shaped plate

15, 16 with a short shank section 15 and a long shank section 16. The dispenser is oriented hanging vertically on a wall, so that the long shank 16 rests against the wall. The short shank 15 then extends perpendicularly from the wall and forms a hold for a per se known pistol mechanism 17. This mechanism is provided with a fixed handle 18 and a hinged handle 19, with whose help a piston rod 20 can be pumped in the longitudinal direction of the rod. The lower end of the rod is provided with a pressure plate 21, which acts against the bottom of the cartridge container 10.

A connection element 22 transfers the motion of the rod 20 to a second, in parallel working piston rod 23, which extends into the hardener container 12 with its lower end, and acts to dispense hardener fluid via a downwards bent spout 24. From the above is evident that the diameters of the containers 10 and 12 determine the quantity of dispense compound, so the correct proportions of putty and hardener are obtained. The connection piece 22 is provided with a locking nut 25, with whose help the piston rod 23 can be disconnected and dislocated in relation to rod 20.

The carrier 13 is provided with two perpendicularly projecting bars 26 at the lower end of the shank section 16, which bars are connected via vertical rods 27 to the shank section 15. The bars 26 are U-shaped with the openings turned against each other.

The holder 14 includes a rectangular plate 28 formed by a strong sheet metal, resting in the slots of the U-shaped bars 26, in a position defined by bosses 26a.

The upper side of the plate 28 is provided with an internal screw attachment 29 for the container 10 and a pipe joint 30 for the container 12. The underside of the plate 28 is provided with a valve in the form of a disc 31, which is pivoted at a bolt axle 32 and manoeuvrable by means of a

handle 33. The disc is provided with an opening 34 located between the axle 32 and the periphery edge of the disc, which opening is placed in front of a corresponding opening in the plate 28, in one turning position of the plate. This turning position is defined by a downwards directed pro¬ jecting boss 35 at the underside of the plate 28. A second end position for the handle 33 is defined by a stopping surface 36 at a downwards folded border of the plate.

The disc 31 is provided with a first sealing strip 37 along its periphery edge and a second sealing strip 38 round the opening 34. By means of these both strips, an efficient sealing is obtained in the valve area. The distance between the dispense opening of the container and the opening 34 of the disc is very short and contains an insignificant amount of putty. Besides, a distinct cut of the putty string takes place when the handle is manoeuvred from the open position to the closed position. Due to the long distance between the opening 34 of the disc and the spout 24 for the hardener, the risk of contact between hardener and putty at the under¬ side of the holder is nonexistent.

The detachable holder 14 can be lifted out from the carrier 13 after that the piston rod 20 has been disconnected from its displacing mechanism 17-19, and has been displaced upwardly to its upper end position together with the piston rod 23. The holder can now be removed to a place suitable for cleaning the valve opening, e.g. in a fume cupboard. The holder can then either be remounted in the carrier 13, or be replaced by another holder with putty of another quality.

The invention is not limited to the embodiment described above, instead several variants are conceivable within the scoop of the following claims. For instance, the carrier can be provided with other means for displacing the piston rod 20.