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:
Jun. 07, 1977
Filed:
Apr. 17, 1975
Eugene L Garber, McConnellsburg, PA (US);
Fulton Industries, Inc., McConnellsburg, PA (US);
Abstract
A protective circuit for an overload sensor of a lifting boom, such as an aerial platform boom. Excess deflection of the boom under load, due to such factors as weight of the load, boom angle and boom extension, is detected by the actuation of an overload sensor switch engaged by the free end of a beam which extends generally parallel to the boom, the other end of the beam being fixed to the boom. The overload sensor switch is in a protective circuit which causes interruption of current to controls which effect movement of the boom in a manner to increase the boom deflection, and which circuit causes the interrupted circuit to remain interrupted independently of the position of the overload sensor switch. The circuit requires positive resetting once there has been such interruption. The protective circuit includes a drop out relay in series with the overload sensor switch, a latching relay with re-set coil, and control circuit switches controlled by the latching relay.