# US 4,397,370 A · Surf service vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,397,370 A - Document ID: US4397370A - Status: Granted - Kind: A - Application number: 06/272,930 - Filed: 1981-06-12 - Granted: 1983-08-09 - Earliest claimed: 1981-06-12 - Assignees: Healy Tibbitts Construction Co. - Inventors: Richard H. Smith - Web page: https://patentgrep.com/patent/US4397370A ## CPC - B60F 3/003: {Parts or details of the vehicle structure; vehicle arrangements not otherwise provided for} - B63B 35/00: Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for - B63H 19/08: by direct engagement with water-bed or ground - B60F: VEHICLES FOR USE BOTH ON RAIL AND ON ROAD; VEHICLES CAPABLE OF TRAVELLING IN OR ON DIFFERENT MEDIA, e.g. AMPHIBIOUS VEHICLES (air-cushion vehicles B60V) - B63B: SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING (arrangements of vessel ventilation, heating, cooling, or air-conditioning B63J2/00; floating substructures as supports of dredgers or soil-shifting machines E02F9/06) - B63H: MARINE PROPULSION OR STEERING (propulsion of air-cushion vehicles B60V1/14; specially adapted for submarines, other than nuclear propulsion, B63G; specially adapted for torpedoes F42B19/00) ## Abstract An offshore service vehicle of tricycle configuration employs three vertical legs to support a platform which remains above the water surface as the vehicle travels from a dry land station outwardly to service stations offshore such, for example, as a stationary tower or anchored barge. One of the legs at a forward location is rotatable for steering. Wheels at the bottoms of the legs are individually driven by motors in sealed housings immediately adjacent of the legs. ## Claims ### Claim 1 A service vehicle for varied terrain comprising a substantially horizontal load carrying frame, three legs having upper ends of each in anchored engagement with said frame in a triangular disposition and extending vertically downwardly from the frame, each of said legs having a communicating passageway therein and having a rolling assembly at the lower end adapted to provide for transportation of the frame over said terrain, at least one of said rolling assemblies having a motor with a sealed housing, a drive shaft in driven relationship with the motor and a rotatable traction member on the drive shaft, control means on the frame for said motor including a control connection between said control means and said motor and extending from the control means through the communicating passageway in the respective leg, one of said legs being a steerable leg having an upper end section in fixed position on said frame, a lower end section having a rotatable engagement with said upper end section and steering means in engagement with said lower end section having an operative control accessible from said frame whereby to steer said vehicle during travel. ### Claim 2 A service vehicle as in clam 1 wherein the rolling assembly with the motor is on the leg which is in fore and aft relationship with respect to the other two legs. ### Claim 3 (depends on 2) A service vehicle as in claim 2 wherein there is a rolling assembly equipped with a motor on all three legs. ### Claim 4 (depends on 1) A service vehicle as in claim 1 wherein the motor is a hydraulic motor and said control means is a hydraulic control means located adjacent the forward part of the frame. ### Claim 5 (depends on 1) A service vehicle as in claim 1 wherein there is a transmission and clutch means between the traction member and the motor and a drive shaft in the respective leg between the transmission and clutch means and the motor. ### Claim 6 (depends on 1) A service vehicle as in claim 1 wherein said rolling assembly for the steerable leg comprises a pair of wheels in axial alignment with each other, a separate axle mounting each wheel in position on the leg and a separate motor for each wheel. ### Claim 7 (depends on 6) A service vehicle as in claim 6 wherein said motors are hydraulic motors responsive alternatively to a high pressure low volume hydraulic supply and to a low pressure high volume hydraulic supply. ### Claim 8 (depends on 7) A service vehicle as in claim 7 wherein one of said motors is responsive to the high pressure hydraulic supply and the other motor is responsive to the low pressure hydraulic supply. ### Claim 9 (depends on 1) A service vehicle as in claim 1 wherein said frame comprises horizontal tubular beams extending between the upper ends of said legs and wherein said legs are hollow vertical tubular columns. ### Claim 10 (depends on 9) A service vehicle as in claim 9 wherein said frame includes a plurality of platform sections in horizontal parallel relationship. ### Claim 11 (depends on 10) A service vehicle as in claim 10 wherein there are brackets on said horizontal tubular beams and releasable attachment means between said platform sections and said brackets. ### Claim 12 (depends on 9) A service vehicle as in claim 9 wherein each of said horizontal tubular beams comprises end sections and an intermediate section of the same diameter, said end sections having each an integrally anchored position adjacent the upper ends of the respective legs, said intermediate section having a releasable attachment to the respective end sections adapted to be released for replacement with an intermediate section of the same diameter and of a different length. ### Claim 13 (depends on 9) A service vehicle as in claim 9 wherein the upper end section and lower end section of the respective legs have substantially the same diameter, the upper end section having an integrally anchored position on the frame, said lower end section having a fixed position adjacent the rolling assembly and wherein there is an intermediate section of the same diameter as said end sections, said intermediate section having a releasable attachment to the respective end sections adapted to be released for replacement with an intermediate section of the same diameter and of different length. ### Claim 14 (depends on 1) A service vehicle as in claim 1 wherein said legs are hollow verticular tubular columns and there is a motor within each column adjacent the lower end section, said column comprising the sealed housing for the respective motor. ### Claim 15 (depends on 1) A service vehicle as in claim 1 wherein the rolling assembly on said steerable leg comprises a wheel fork assembly having laterally spaced parallel legs each providing a sealed inner chamber, said traction member comprising a wheel rotatably supported between said legs, said motor being located in the chamber in one of said legs. ### Claim 16 (depends on 15) A service vehicle as in claim 15 wherein there is a separable connection intermediate opposite ends of at least one of said legs whereby to enable removal and replacement of the wheel. ### Claim 17 (depends on 15) A service vehicle as in claim 15 wherein there is a connecting passageway between the passageway in the leg and said chambers and a flexible connection between said wheel fork assembly and the steerable leg whereby to enable tilting of said wheel fork assembly in a direction transverse to the fore and aft axis of said vehicle. ### Claim 18 A service vehicle for varied terrain comprising a substantially horizontal load carrying frame, three legs having upper ends of each in anchored engagement with said frame in a triangular disposition and extending vertically downwardly from the frame, each of said legs having a rolling assembly at the lower end adapted to provide for transportation of the frame over said terrain, at least one of said rolling assemblies comprising a motor having a sealed housing and having a horizontally extending drive shaft with a rotatable traction member on the drive shaft, control means on the frame for said motor including a control connection between said control means and said motor, one of said legs being a steerable leg having an upper end section in fixed position on said frame, a lower end section having a rotatable engagement with said upper end section and steering means in engagement with said lower section having an operative control accessible from said frame whereby to steer said vehicle during travel, the rolling assembly on said steerable leg comprising a wheel fork assembly having laterally spaced parallel legs, said traction member comprising a wheel rotatably supported between said legs, a flexible connection between said wheel fork assembly and the steerable leg whereby to enable tilting of said wheel fork assembly in a direction transverse to the fore and aft axis of said vehicle, said wheel fork assembly having a tubular base forming a junction for said legs and said flexible connection comprising hinge means on said wheel fork assembly, complementary hinge means on said steerable leg, a pivot means for said hinge means forming a restricted joint enabling tilting of said wheel fork assembly in a direction transverse to the fore and aft axis of said vehicle and inhibiting tilting of said wheel fork assembly in said fore and aft direction, and a flexible sleeve between the steerable leg and the base of said wheel fork assembly.