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. 29, 1976
Filed:
Sep. 06, 1974
Ferdinand Kofel, Wallisellen, CH;
Koehring GmbH -- Bomag Division, Boppard, Rhine, DT;
Abstract
A tandem road roller having a pair of rolls arranged one behind the other which are capable of both pivoting relative to each other to negotiate curves and being offset relative to each other to vary the width of the roller track. The roller comprises a first frame member carried on the front roll, a second frame member carried on the rear roll, a connecting bar member hinged at opposite ends to the first and second frame members between the rolls, and an actuating mechanism operating on the first and second frame members to control their angular relationship and to control their lateral offset. Preferably the actuating mechanism includes two fluid pressure operated double-acting piston and cylinder assemblies and in this case one of the piston and cylinder assemblies is preferably arranged parallel to but spaced apart from the intermediate frame member and the other piston and cylinder assembly is connected diagonally between the one piston and cylinder assembly and the intermdiate frame member. With this arrangement one piston and cylinder assembly controls the steering of the roller whilst the other controls the rolling width of the roller.