Patent ID: 11925948
Assignee: THE PROCTER & GAMBLE COMPANY
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B

Claim 17:
18. A manually operated pump comprising:
an inlet one-way valve;
a pump chamber downstream of and in fluid communication with said inlet one-way valve;
a piston interior to said pump chamber and slideably engaged with said pump chamber;
an actuator engaged with said piston or said pump chamber; and
a block thermoplastic elastomeric spring engaged with said actuator to move said actuator as said block thermoplastic elastomeric spring relaxes;
wherein said block thermoplastic elastomeric spring has an actuator facing surface oriented towards said actuator, wherein only a portion of said actuator facing surface is engaged with said actuator through one or more stress concentrators;
wherein said stress concentrators contact from about 2% to about 20% of said actuator facing surface.