External fuel metering valve with shuttle mechanism
AssigneeBlack & Decker Inc.
InventorsWilliam Rigdon, Gary Hill, Daniel J. White, Matthew J. Velderman, Derek Marchanti
Life of this patent
Estimating the term…
Abstract
A handheld combustion powered fastening tool may include a driving system that drives fasteners into workpieces in response to combustion of fuel by the driving system. A fuel delivery system may supply fuel to the driving system. The fuel delivery system may include a fuel canister storing liquid fuel, such as liquid hydrocarbons such as propane, and a fuel metering valve supplying a previously set amount, or volume, of fuel from the fuel canister to the driving system for combustion.
Claims20
An external fuel metering valve, comprising:
- a main valve body;
- a valve cap coupled to the main valve body;
- a chamber, including:
- a first portion defined in the main valve body;
- and
- a second portion defined in the valve cap, axially aligned with the first portion;
- a control space connected to the chamber;
- and
- a shuttle movably positioned in the chamber, between
- a first position, in which a discharge flow path from the control space through the shuttle and an outlet of the valve cap is open;
- and
- a second position, in which a filling flow path from an inlet of the main valve body through the shuttle and into the control space is open.
A fuel delivery system for a combustion-powered tool, comprising:
- a fuel canister;
- and
- an external fuel metering valve externally coupled to the fuel canister, the external fuel metering valve including:
- a main valve body;
- a valve cap coupled to the main valve body;
- a chamber defined within the main valve body and the valve cap;
- a control space defined in at least one of the main valve body or the valve cap, the control space being in fluid communication with the chamber;
- and
- a shuttle movably installed in the chamber, wherein
- in a first position of the shuttle in the chamber, a discharge flow path from the control space through the shuttle and an outlet of the valve cap is opened in response to an external force;
- and
- in a second position of the shuttle in the chamber, a filling flow path is opened to the control space.
Dependencies are inferred from the claim text.