E - Fixed Constructions – 21 – C
Patent
E - Fixed Constructions
21
C
262/69
E21C 25/00 (2006.01) B28D 1/04 (2006.01) B28D 7/00 (2006.01) E02D 17/13 (2006.01) E02F 3/20 (2006.01) E02F 3/24 (2006.01) E02F 3/36 (2006.01) E02F 3/96 (2006.01) E21C 25/16 (2006.01) E02F 3/18 (2006.01) E02F 5/02 (2006.01)
Patent
CA 1235151
-25- ABSTRACT OF THE DISCLOSURE A rotary trench cutting or rock milling saw unit is supported on a head for movement about two mutually perpendicular axes. The head is adapted for pivotal mounting on a backhoe boom or similar positioning structure. Rotary rock cutting wheels are driven by a hydraulic motor and a support vehicle for the saw unit includes a hydrostatic drive system with a variable displacement hydraulic pump driving variable displacement track drive motors which may be set in a slow speed operating mode for trench cutting operations or a high speed mode for tramming between work sites. A constant rate of power input to the saw unit is maintained by sensing saw drive motor supply pressure and adjusting tract drive motor supply pump displace- ment to maintain a constant feed or rock cutting rate. The apparatus includes hydraulically operated actuators for rotating the saw unit and its support boom about a vertical axis with respect to the apparatus undercarriage, elevating the boom with respect to the undercarriage, and moving the saw unit about three mutually perpen- dicular axes with respect to the support boom. Each of the actuators includes a control valve which may be selectively positioned to operate the actuators in reverse directions, lock the actuators in a predetermined position, or permit the actuators to oscillate or rotate the saw unit with respect to the various positioning axes of rotation when the saw unit is confined in a trench.
482347
H.b. Zachry Company
Kirby Eades Gale Baker
LandOfFree
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