Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
209 words
A dispensing cartridge comprising: a reservoir cylinder having an inner wall and an outlet nozzle; a delivery piston having an annular sealing means, said piston slidably engaging said inner wall of said cylinder by action of said annular sealing means; said delivery piston adapted to being responsive to variable thrust providable by intermittent actuation of a dispensing plunger so as to cause said delivery piston to be advanced in a step-wise manner for allowing apportioned dispensing of contents of the cartridge through said outlet nozzle; said delivery piston including a rigid piston head, a substantially cylindrical piston wall and an annular groove therebetween defined by a first groove wall portion in said piston head and a second groove wall portion in said piston wall, said annular sealing means disposed in said annular groove; and said first and second groove wall portions being elastically deformable so that the groove in cross-section will be changed in response to the variable thrust applied to said dispensing plunger so as to squeeze said sealing means within the groove during piston advance and to release said sealing means when thrust is removed from the dispensing plunger to permit the delivery piston to recede in a direction opposite to the direction of the applied thrust.
Claim 2
Dependent Claim
209 words
A dispensing cartridge comprising: a reservoir cylinder having an inner wall and an outlet nozzle; a delivery piston having an annular sealing means, said piston slidably engaging said inner wall of said cylinder by action of said annular sealing means; said delivery piston adapted to being responsive to variable thrust providable by intermittent actuation of a dispensing plunger so as to cause said delivery piston to be advanced in a step-wise manner for allowing apportioned dispensing of contents of the cartridge through said outlet nozzle; said delivery piston including a rigid piston head, a substantially cylindrical piston wall and an annular groove therebetween defined by a first groove wall portion in said piston head and a second groove wall portion in said piston wall, said annular sealing means disposed in said annular groove; and said first and second groove wall portions being elastically deformable so that the groove in cross-section will be changed in response to the variable thrust applied to said dispensing plunger so as to squeeze said sealing means within the groove during piston advance and to release said sealing means when thrust is removed from the dispensing plunger to permit the delivery piston to recede in a direction opposite to the direction of the applied thrust.
Claim 3
Dependent Claim
20 words
A dispensing cartridge as stated in claim 1, wherein the piston wall is axially displaceable relative to the piston head.
Claim 4
Dependent Claim
34 words
A dispensing cartridge as stated in claim 2, wherein the piston wall is connected with the piston head by way of a diaphragm which is separated from the piston head by a radial fissure.
Claim 5
Dependent Claim
28 words
A dispensing cartridge as stated in claim 2, wherein the annular groove has a base portion which is flexible and connects the piston wall with the piston head.
Claim 6
Dependent Claim
26 words
A dispensing cartridge as stated in claim 1, wherein the annular groove has a base portion which is deformable in a radial direction of said cylinder.
Claim 7
Dependent Claim
26 words
A dispensing cartridge as stated in claim 1, wherein the piston head forms a support area for the plunger limiting deformation of said groove wall portions.
Claim 8
Dependent Claim
31 words
A dispensing cartridge as stated in claim 1, wherein a support cylinder extending from the piston head forms a support area for the plunger limiting deformation of said groove wall portions.