US 8,038,038 B2 · Spring engine driven fluid dispensing system

Abstract

A fluid dispensing system provides a sprayer. The system has a container with liquid fluid, such as used in lawn and garden weed control and fertilization. The sprayer has a handle containing a spring engine and a pump for liquid from the container. The spring engine has a flat spring having a spring band extending from two coils wound on two shafts. One of the coils is manually wound by a crank connected to a shaft on which the coil is connected. The other shaft is connected to the pump by a rotary cam driver. Liquid is sucked by the pump into a pump chamber during part of a cycle of rotation of the other shaft when the coils are unwound and the liquid is pumped out of the chamber during the other part of the cycle of rotation to a sprayer head on the sprayer handle.

Claims17

Dependent claims

A fluid dispensing system comprising a spring engine having a spring winding cycle and a spring unwinding cycle, a pump in communication with a source of fluid to be dispensed larger in capacity than said pump, and a transmission providing a plurality of actuations of said pump for each cycle of said engine thereby dispensing a substantially continual stream of fluid from said source, and further comprising means for manually winding a flat band into a first coil during said winding cycle, a spool receiving a second coil of said band when said first coil unwinds during said unwinding cycle, said transmission being coupled to said second coil.

A sprayer for spraying liquid from a tank which comprises:

a spring engine having a manually windable flat or band spring;
and
a pump for drawing liquid from said tank and ejecting a substantially continual stream of liquid to provide a spray, said pump being driven by said engine, and
wherein said spring engine comprises:
a band spring wound in two coils;
a crank for winding said spring into at least one of said coils;
and
a mechanism for translating motion when said coil unwinds into motion of said pump, wherein said coils of said spring are disposed on and windable and unwindable between a storage spool and an output spool, and a winding spool, a spring winding filamentary element windable on and between one of said storage and output spools to wind said spring coil on said one of said storage and output spools while winding said element on said winding spool.

5 more elements

Dependencies are inferred from the claim text.

Spring engine driven fluid dispensing system

Life of this patent

Spring engine driven fluid dispensing system

Life of this patent

Abstract

Claims17