Dispenser for cartridges

Claim 2

In a dispenser for cartridges provided with delivery plungers, the dispenser having a ram guided longitudinally on the dispenser body for acting on the deliver plungers as well as forward drive means for the ram, the improvement comprising at least one retrieval element for the ram, which is interactively connected with a stationary dispenser part and the ram, said retrieval element being frictionally yet slidingly guided along one of the mentioned parts up to an abutting engagement against the other of these parts, and, by way of at least one retrieval spring loadable by the forward drive means, said retrieval element being movable longitudinally over a retrieval path (s) relative to the said other part, which is a supporting part for said spring, whereby, at an end of each forward thrust of said ram, as driven by said forward drive means, said ram will immediately, positively and automatically retract under the influence of said retrieval spring and frictional engagement to thereby avoid continued dispensing of any material.

Claim 3

The dispenser as in claim 1, which is formed to hold double cartridges and the ram is a twin ram.

Claim 4

The dispenser as in claim 1, wherein the length of the retrieval path (s) is limited by stops provided on said supporting part.

Claim 5

The dispenser as in claim 1 or 3, wherein, as a retrieval spring, at least one pressure spring is provided.

Claim 6

The dispenser as in claim 1 or 3, wherein the forward drive means are formed by a compressed air-driven cylinder/piston unit, the cylinder of which is connected with the dispenser body and the piston of which is connected with the ram, said retrieval element being frictionally guided at the cylinder and supported by way of springs on the piston.

Claim 7

The dispenser as in claim 1, wherein the retrieval element is frictionally guided on the ram and at the dispenser body by springs.

Claim 8

The dispenser as in claim 6, wherein the forward drive means is formed by a ratchet mechanism acting together with longitudinal sawteeth provided on the ram.

Claim 9

The dispenser as in claim 6, wherein the forward drive means are formed by a compressed air-driven cylinder/piston unit, the cylinder of which is connected with the dispenser body and the piston of which is connected to the ram (34).

Claim 10

In a dispenser for cartridges provided with delivery plungers, the dispenser having a ram guided longitudinally on the dispenser body for acting on the delivery plungers as well as forward drive means for the ram, the improvement comprising at least one retrieval element for the ram, said retrieval element being interactively connected with a stationary dispenser part and the ram and being guided, by friction coupling, along the ram; at least one retrieval spring being disposed between said stationary dispenser part and said retrieval element, said frictional coupling having an associated frictional force greater than a force stored in said retrieval spring when said spring is loaded; wherein said retrieval element, upon action of said forward drive means, being adapted to moving forward with said ram as a result of said friction coupling; forward movement of said ram over a distance (s) along a retrieval path acting to load said retrieval spring; further forward movement of said ram causing the frictional coupling between ram and retrieval element to be overcome so as to allow continued forward movement of the ram while the retrieval element is prevented from forward movement by the stationary dispenser part acting through said loaded spring; upon completion of action of said forward drive means, said loaded retrieval spring acting to cause said ram and retrieval element to immediately, positively and automatically retract to thereby avoid continued dispensing of any material from the cartridge.

Claim 11

In a dispenser for cartridges provided with delivery plungers, the dispenser having a ram guided longitudinally on the dispenser body for acting on the delivery plungers as well as forward drive means for the ram, the improvement comprising at least one retrieval element for the ram, said retrieval element being interactively connected with a stationary dispenser part and the ram and being guided, by friction coupling, along the ram; at least one retrieval spring being disposed between said stationary dispenser part and said retrieval element, said frictional coupling having an associated frictional force greater than a force stored in said retrieval spring when said spring is loaded; wherein said retrieval element, upon action of said forward drive means, being adapted to moving forward with said ram as a result of said friction coupling; forward movement of said ram over a distance (s) along a retrieval path acting to load said retrieval spring; further forward movement of said ram causing the frictional coupling between ram and retrieval element to be overcome so as to allow continued forward movement of the ram while the retrieval element is prevented from forward movement by the stationary dispenser part acting through said loaded spring; upon completion of action of said forward drive means, said loaded retrieval spring acting to cause said ram and retrieval element to immediately, positively and automatically retract to thereby avoid continued dispensing of any material from the cartridge.

Claim 12

The dispenser of claim 9 wherein said retrieval spring includes at least one pressure spring.

Claim 13

The dispenser of claim 9 wherein the forward drive means is formed by a ratchet mechanism acting together with longitudinal sawteeth provided on the ram, said ratchet mechanism allowing for reverse motion of said ram after completion of a forward drive action by said forward drive means.

Claim 14

The dispenser of claim 9 wherein the forward drive means are formed by a compressed air-driven cylinder/piston unit, the cylinder of which is connected with the dispenser body and the piston of which is connected to the ram.

Claim 15

The dispenser of claim 9, wherein said dispenser is formed to hold double cartridges and the ram is a twin ram.

Claim 16

The dispenser of claim 9 including means for limiting the length of the retrieval path (s).

Claim 17

The dispenser of claim 14 wherein said means for limiting the retrieval path length includes at least one stop.

Claim 18

In a dispenser for cartridges provided with delivery plungers, the dispenser having a ram guided longitudinally on the dispenser body for acting on the delivery plungers as well as forward drive means for the ram, the improvement comprising at least one retrieval element for the ram, said retrieval element being interactively connected with a stationary dispenser part and the ram and being guided, by frictional coupling, along said stationary dispenser part; at least one retrieval spring being disposed between said ram and retrieval element, said frictional coupling having an associated frictional force greater than a force stored in said retrieval spring when said spring is loaded; wherein, upon action of said forward drive means, said ram forwardly moves a distance (s) along a retrieval path so as to load said retrieval spring; further forward movement of said ram causing the frictional coupling between retrieval element and stationary dispenser part to be overcome so as to allow continued forward movement of said ram together with said retrieval element; upon completion of action of said forward drive means, said frictional coupling between stationary dispenser and retrieval element operating to prevent movement of said retrieval element, said loaded retrieval spring acting to cause said ram to immediately, positively and automatically retract to thereby avoid continued dispensing of any material from the cartridge.

Claim 19

In a dispenser for cartridges provided with delivery plungers, the dispenser having a ram guided longitudinally on the dispenser body for acting on the delivery plungers as well as forward drive means for the ram, the improvement comprising at least one retrieval element for the ram, said retrieval element being interactively connected with a stationary dispenser part and the ram and being guided, by frictional coupling, along said stationary dispenser part; at least one retrieval spring being disposed between said ram and retrieval element, said frictional coupling having an associated frictional force greater than a force stored in said retrieval spring when said spring is loaded; wherein, upon action of said forward drive means, said ram forwardly moves a distance (s) along a retrieval path so as to load said retrieval spring; further forward movement of said ram causing the frictional coupling between retrieval element and stationary dispenser part to be overcome so as to allow continued forward movement of said ram together with said retrieval element; upon completion of action of said forward drive means, said frictional coupling between stationary dispenser and retrieval element operating to prevent movement of said retrieval element, said loaded retrieval spring acting to cause said ram to immediately, positively and automatically retract to thereby avoid continued dispensing of any material from the cartridge.

Claim 20

The dispenser of claim 16 wherein said retrieval spring includes at least one pressure spring.

Claim 21

The dispenser of claim 16 wherein the forward drive means is formed by a ratchet mechanism acting together with longitudinal sawteeth provided on the ram, said ratchet mechanism allowing for reverse motion of said ram after completion of a forward drive action by said forward drive means.

Claim 22

The dispenser of claim 16 wherein the forward drive means are formed by a compressed air driven cylinder/piston unit, the cylinder of which is connected with the dispenser body and the piston of which is connected with the ram.

Claim 23

The dispenser of claim 16 including means for limiting the length of the retrieval path.

Claim 24

The dispenser of claim 20 wherein said means for limiting the retrieval path length includes at least one stop.