The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 21, 1989
Filed:
Aug. 17, 1987
Paul A Biek, Houston, TX (US);
Dresser Industries, Inc., Dallas, TX (US);
Abstract
The invention provides a low pressure shut off device contained within a pneumatic tool that senses the air pressure of an air stream supplied to a pneumatic motor and shuts off the air flow when the pressure falls below a predetermined level set to maintain consistent performance of the tool and to avoid damage to the tool or to the workpiece. The invention includes a throttle valve, a throttle piston that moves to open and close the valve, and a device for sensing the air pressure of the supply stream, holding the throttle valve open when the pressure is sufficient and closing it when the supply pressure is insufficient. The invention may also be used in combination with an air control system within a pneumatic tool such that the sensing device shuts off the flow of air to the air control system as well as the motor when the air control system pressure is insufficient.