US 12,330,176 B2
Modular, adjustable force, all-polymer helical biasing member and pump dispenser incorporating same
Simon Christopher Knight, Bridgend (GB)
Assigned to RIEKE PACKAGING SYSTEMS LIMITED, Leicestershire (GB)
Appl. No. 18/022,031
Filed by RIEKE PACKAGING SYSTEMS LIMITED, Leicestershire (GB)
PCT Filed Aug. 18, 2021, PCT No. PCT/EP2021/072961
§ 371(c)(1), (2) Date Feb. 17, 2023,
PCT Pub. No. WO2022/038194, PCT Pub. Date Feb. 24, 2022.
Claims priority of provisional application 63/067,057, filed on Aug. 18, 2020.
Prior Publication US 2023/0347368 A1, Nov. 2, 2023
Int. Cl. B05B 11/10 (2023.01)
CPC B05B 11/1077 (2023.01) [B05B 11/1074 (2023.01)] 13 Claims
OG exemplary drawing
 
1. An all-polymer, reciprocating dispenser pump comprising:
an actuator having a stem;
a pump body configured to receive the stem; and
a biasing member interposed between the actuator and the pump body to urge the actuator away from the pump body, the biasing member comprising a plurality of modular units arranged in a stack and each having a central aperture sized to coaxially receive the stem; wherein each modular unit includes an upper radial flange, a lower radial flange, a wall section, a central aperture, and an outer helix trace radially offset from an inner helix trace, with both the outer helix trace and the inner helix trace spiraling round a central axis of the biasing member from a bottom edge to a top edge so as to impart a corrugated surface to the wall section; and wherein the upper radial flange of each modular unit is configured to be received in the lower radial flange, or to be abutted with the upper radial flange, of an adjacent modular unit in the stack.