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:
Jul. 16, 1985
Filed:
Apr. 28, 1982
John E Wieschel, Hartland, WI (US);
Harnischfeger Corporation, Milwaukee, WI (US);
Abstract
In a mast crane wherein a tension member controls the position of a carriage along an upright guide rail, the tension member is connected with a load transmitting element against which an abutment on the carriage bears down under carriage weight. A brake shoe carrier that has a link connection with the carriage carries two brake shoes, and by swinging about said link connection it clampwise engages them against opposite carriage-guiding surfaces on the rail. A linkage connecting the load transmitting element with the brake shoe carrier causes brake-engaging swinging of the carrier when the load transmitting element drops away from the abutment upon failure of the tension member. A spring biases the brake shoe carrier for such swinging, but its force is normally overcome by weight of the carriage. The link connection of the brake shoe carrier with the carriage is arranged for brake self-energizing once the brake shoes engage the rail.