EP0143183B1 — Dispenser for active materials

Claim 1

Independent Claim 160 words

Active material dispenser with a storage container (2b), which has a container neck (31 b) and a storage space (28b) connected thereto via an end wall (7b), with a drag piston (29b) displaceable in storage space (28b) and with a thrust piston pump (1 b) for the discharge of the active material from storage space (28b) inserted with a cylinder casing (3b) in container neck (31 b), a suction shoulder (34) with a suction opening projecting into the storage space (28b) is associated with the thrust piston pump (1b) and in the drag piston (29b) is provided a cup-shaped depression whose cross-section corresponds to the shape of the suction shoulder, characterized in that the cylinder casing (3b) of the thrust piston pump (1 b) forms the closure of the storage space (28b) and that the suction shoulder (34) is part of the cylinder casing (3b) and as a suction connection projects into a central area of the storage space (28b).

Claim 2

Dependent Claim 160 words

Active material dispenser with a storage container (2b), which has a container neck (31 b) and a storage space (28b) connected thereto via an end wall (7b), with a drag piston (29b) displaceable in storage space (28b) and with a thrust piston pump (1 b) for the discharge of the active material from storage space (28b) inserted with a cylinder casing (3b) in container neck (31 b), a suction shoulder (34) with a suction opening projecting into the storage space (28b) is associated with the thrust piston pump (1b) and in the drag piston (29b) is provided a cup-shaped depression whose cross-section corresponds to the shape of the suction shoulder, characterized in that the cylinder casing (3b) of the thrust piston pump (1 b) forms the closure of the storage space (28b) and that the suction shoulder (34) is part of the cylinder casing (3b) and as a suction connection projects into a central area of the storage space (28b).

Claim 3

Dependent Claim 34 words

Dispenser according to claim 1, characterized in that the cup-shaped depression is formed by a cup-shaped sleeve (45) located within a piston ring of the drag piston (29b) and whereof one end is closed.

Claim 4

Dependent Claim 26 words

Dispenser according to claim 2, characterized in that the sleeve (45) projects over the end of the piston ring remote from the thrust piston pump (1b).

Claim 5

Dependent Claim 74 words

Dispenser according to one of the preceding claims, characterized in that the inner cross- sections of the cup-shaped depression of the drag piston (29b) are substantially precisely adapted to the in particular stepped, tapered outer shape of the casing part of the cylinder casing (3b) of thrust piston pump (1 b) projecting into storage space (28b), in such a way that said casing part fills the depression when the storage space (28b) is empty.

Claim 6

Dependent Claim 38 words

Dispenser according to one of the preceding claims, characterized in that the casing part projecting into the storage space (28b) or the thrust piston pump (1 b) and the drag piston (29b) are substantially equiaxial to one another.

Claim 7

Dependent Claim 25 words

Dispenser according to one of the preceding claims, characterized in that the drag piston (29b) is provided with two piston lips located at both ends.

Claim 8

Dependent Claim 30 words

Dispenser according to claim 6, characterized in that a piston lip is provided at one end of the piston ring and that the cup-shaped sleeve (45) projects over said end.

Claim 9

Dependent Claim 96 words

Dispenser according to one of the preceding claims, characterized in that in the line path between the pump piston (4b) and a discharge opening (18b) is provided an axially preloaded exhaust valve (17b), which is opened mechanically in a forcibly controlled manner at the end of the piston stroke and whose closing part (21 b) is preferably formed by an elastic compression sleeve (35), whose outer end (36) is connected to a piston shaft (8b) and in particular with the inner end adjacent to the circular closing part (21 b) forms the circular pump piston (4b).

Claim 10

Dependent Claim 50 words

Dispenser according to claim 8, characterized in that at the end of the piston stroke, the pump piston (4b) engages against a stop shoulder (26b) and that the piston shaft (8b) can be moved beyond the stop position of pump piston (4b), accompanied by the opening of exhaust valve (17b).

Claim 11

Dependent Claim 69 words

Dispenser according to claims 8 or 9, characterized in that the circular closing part (21 b) of exhaust valve (17b) has a valve closing surface (41) associated with the piston shaft (8b) and located on the inner circumferential face and a stop surface (42) located on the outer circumference, which with the pump piston (4b) returned sealingly engages with pretension on an opposite shoulder (26b) of pump cylinder (3b).

Claim 12

Dependent Claim 57 words

Dispenser according to one of the preceding claims, characterized in that, with the pump piston (4b) returned, the pump cylinder (3b) is hermetically sealed in pressure-tight manner with respect to the storage space (28b) and/or the outside and that the valve closing pressure of exhaust valve (17b) is higher than the maximum pressure in storage space (28b).

Claim 13

Dependent Claim 48 words

Dispenser according to claims 10 or 11, characterized in that between the piston packing (37) and the seal formed by stop face (42) and the opposite shoulder (26b) is formed a completely closed annulus (43) bounded on the outside by the uninterrupted circumferential casing of pump cylinder (3b).

Dispenser for active materials

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag