# US 5,346,240 A · Fifth wheel mounting > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,346,240 A - Document ID: US5346240A - Status: Granted - Kind: A - Application number: 08/115,815 - Filed: 1993-09-03 - Granted: 1994-09-13 - Earliest claimed: 1993-09-03 - Inventors: Charles A. Pettit - Web page: https://patentgrep.com/patent/US5346240A ## CPC - B60D 1/54: collapsible or retractable when not in use, e.g. hide-away hitches - B62D 53/0828: {Removable or fold-away traction couplings for non-specialised tractor vehicles} - Y10S 280/901: Adaptation of nonspecialized vehicles to semitrailer tractors - B60D: VEHICLE CONNECTIONS - B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M) - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract A trunk extends down through an opening in the truck's flat bed. A mounting frame is pivoted in the trunk and swings to an open position where the fifth wheel mounted thereon is exposed. Locks releaseably retain the frame in the open and in the closed positions. ## Claims ### Claim 1 A fifth wheel mounting comprising: a trunk having at least first and second side walls secured together for mounting in a truck bed having an opening therein, said trunk having a top opening therein; a mounting frame positioned within said trunk; and a pivot shaft attached to both said first and second side walls of said trunk and extending across said trunk, said mounting frame being pivoted on said pivot shaft, said mounting frame having a floor plate on one side thereof and having fifth wheel mounting means on the other side thereof, said mounting frame being rotatable about said pivot shaft from a first position wherein said floor plate is substantially in line with the top of said first and second side walls to a second position wherein said fifth wheel mounting means is exposed so that said fifth wheel mounting can be placed in an opening in a truck bed to selectively expose said fifth wheel mounting means, said mounting frame being rotatable about said pivot shaft from said second position back to said first position; and a manual stop interengaged between said mounting frame and said trunk to stop said mounting frame in its motion between said second position toward said first position to prevent complete closure of said mounting frame to said first position until a latch is manually released whereupon said mounting frame can move to said first position. ### Claim 2 (depends on 1) The fifth wheel mounting of claim 1 wherein a stop in said trunk limits rotation of said mounting frame about said pivot shaft to support said floor plate in its first position. ### Claim 3 (depends on 2) The fifth wheel mounting of claim 2 wherein said latch is mounted to releaseably latch said mounting frame in said first position. ### Claim 4 (depends on 2) The fifth wheel mounting of claim 2 wherein a second latch is mounted to selectively latch said mounting frame in its second position. ### Claim 5 (depends on 1) The fifth wheel mounting of claim 1 wherein said mounting frame covers a portion of said top opening of said trunk when said mounting frame is in its first position and further including a cover plate pivotally mounted on said first and second side walls to substantially cover the remainder of said top opening in said trunk when said mounting frame is in its first position. ### Claim 6 A fifth wheel mounting comprising: a trunk having at least first and second side walls secured together for mounting in a truck bed having an opening therein, said trunk having a top opening therein; a mounting frame position within said trunk; and a pivot shaft attached to both said first and second side walls of said trunk and extending across said trunk, said mounting frame being pivoted on said pivot shaft, said mounting frame having a floor plate on one side thereof and having fifth wheel mounting means on the other side thereof, said mounting frame being rotatable about said pivot shaft from a first position wherein said floor plate is substantially in line with the top of said first and second side walls to a second position wherein said fifth wheel mounting means is exposed so that said fifth wheel mounting can be placed in an opening in a truck bed to selectively expose said fifth wheel mounting means; and a spring engaged between said mounting frame and said trunk to urge said mounting frame toward its second position. ### Claim 7 A fifth wheel mounting comprising: a trunk having at least first and second side walls secured together for mounting in a truck bed having an opening therein, said trunk having a top opening therein; a mounting frame positioned within said trunk; and a pivot shaft attached to both said first and second side walls of said trunk and extending across said trunk, said mounting frame being pivoted on said pivot shaft, said mounting frame having a floor plate on one side thereof and having fifth wheel mounting means on the other side thereof, said mounting frame being rotatable about said pivot shaft from a first position wherein said floor plate is substantially in line with the top of said first and second side walls to a second position wherein said fifth wheel mounting means is exposed so that said fifth wheel mounting can be placed in an opening in a truck bed to selectively expose said fifth wheel mounting means; said trunk being formed of front and back walls as well as left and right side walls and there is a latch mounted on said mounting frame for releaseably retaining said mounting frame in its second position wherein said fifth wheel mounting means is exposed, said latch comprising first and second latch pins which are mounted on said mounting frame and releaseably engage in openings in said side walls of said trunk. ### Claim 8 (depends on 7) The fifth wheel mounting of claim 7 wherein said latch pins are connected to a manual handle so that manipulation of said handle can withdraw said latch pins and further including at least one spring urging said latch pins into side wall engaging position. ### Claim 9 A fifth wheel mounting comprising: walls, including at least left and right side walls secured together to form an upright trunk having a generally open interior, said trunk being for securement in an opening in a truck bed so that the top of said trunk is generally in line with the top of the truck bed; a mounting frame within the interior of said trunk, a pivot shaft attached to said side walls of said trunk, said mounting frame being mounted on said pivot shaft for swinging about the axis of said pivot shaft from a first, inactive position to a second, active position, a floor plate on said mounting frame, said floor plate being generally in line with the top of said trunk when said mounting frame is in its first position; a spring engaging both said mounting frame and said trunk, said spring being connected to resiliently urge said mounting means from said first position toward said second position; fifth wheel mounting means on said mounting frame, said fifth wheel mounting means being exposed at the top of said trunk when said mounting frame is in its second position so that said mounting frame rotates about the axis of said pivot shaft from said first position wherein said mounting means is inaccessible from above said deck to a second position wherein said mounting means is accessible from above said deck. ### Claim 10 (depends on 9) The fifth wheel mounting of claim 9 wherein a latch releaseably retains said mounting means in said first position. ### Claim 11 (depends on 9) The fifth wheel mounting of claim 9 wherein a latch releaseably retains said mounting means in said second position. ### Claim 12 A fifth wheel mounting comprising: walls, including at least left and right side walls secured together to form an upright trunk having a generally open interior, said trunk being for securement in an opening in a truck bed so that the top of said trunk is generally in line with the top of the truck bed; a mounting frame within the interior of said trunk, a pivot shaft attached to said side walls of said trunk, said mounting frame being mounted on said pivot shaft for swinging about the axis of said pivot shaft from a first, inactive position to a second, active position, a floor plate on said mounting frame, said floor plate being generally in line with the top of said trunk when said mounting frame is in its first position; first and second latch pins movably mounted on said mounting frame and engagement means on said trunk for releasable engagement by said latch pins together with means for manually releasing said latch pins from said engagement means; and fifth wheel mounting means on said mounting frame, said fifth wheel mounting means being exposed at the top of said trunk when said mounting frame is in its second position so that said mounting frame rotates about the axis of said pivot shaft from said first position wherein said mounting means is inaccessible from above said deck to a second position wherein said mounting means is accessible from above said deck. ### Claim 13 (depends on 12) The fifth wheel mounting of claim 12 wherein said engagement means comprises openings in said side walls of said trunk and said latch pins engage in said openings when said mounting frame is latched in its second position. ### Claim 14 (depends on 13) The fifth wheel mounting of claim 13 wherein said manual means for controlling said latch pins comprises a handle connected to both said latch pins and a spring to urge said latch pins toward the engaged position. ### Claim 15 (depends on 14) The fifth wheel mounting of claim 14 further including a releasable latch for releaseably latching said mounting frame in its first position. ### Claim 16 (depends on 15) The fifth wheel mounting of claim 15 further including a stop in said trunk to stop said mounting frame in its first position.