# US 11,738,704 B2 · Underride guard assembly for trailers

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- Number: US 11,738,704 B2
- Document ID: US11738704B2
- Status: Granted
- Kind: B2
- Application number: 17/216,002
- Filed: 2021-03-29
- Published: 2021-10-07
- Granted: 2023-08-29
- Earliest claimed: 2020-04-02
- Assignees: Great Dane LLC
- Applicants: Great Dane LLC
- Inventors: Christian S. Lee; Younghag Choi; SoonDong Jung
- Web page: https://patentgrep.com/patent/US11738704B2

## CPC

- B60R 19/565: {on vehicle sides}
- B60R 19/023: {Details}
- B62D 21/20: trailer type, i.e. a frame specifically constructed for use in a non-powered vehicle
- B62D 53/06: Semi-trailers
- B62D 33/04: Enclosed load compartments {; Frameworks for movable panels, tarpaulins or side curtains (side curtains per se B60J5/065; tarpaulins per se B60J7/00, B60P7/04)}
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- 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)

## Abstract

A semi-trailer is provided, including a wheeled chassis having at least one wheeled axle at a rearward end and a retractable support at a forward end, a body comprising a cargo deck and an underride guard assembly that is movable in response to an upward force applied thereto.

## Claims

### Claim 1

A semi-trailer, comprising:
a wheeled chassis having a forward end, a rearward end, a first side extending between the forward end and the rearward end, a second side extending between the forward end and the rearward end opposite the first side, at least one wheeled axle at the rearward end, and a retractable support at the forward end, wherein the wheeled chassis is elongated in a longitudinal dimension from the forward end to the rearward end;
a cargo deck supported by the wheeled chassis;
an underride guard assembly attached to the wheeled chassis and comprising at least one first rail disposed below the first side within a first space located forward of wheels of the at least one wheeled axle and rearward of the retractable support,
wherein the at least one first rail extends over at least half of the distance between the wheels and the retractable support in the longitudinal dimension, and
wherein the at least one first rail is pivotably attached to the wheeled chassis so that the at least one first rail is pivotable, from a first position with respect to the wheeled chassis and away from a center of the wheeled chassis between the first side and the second side, upon application of an upward force to the at least one first rail and is pivotable back to the first position in absence of the upward force to the at least one first rail; and
a stop disposed operatively between the at least one first rail and the wheeled chassis so that the stop blocks the at least one first rail from pivoting inward from the first position toward the center in response to application of a force to the at least one first rail that is transverse to the longitudinal dimension and toward the center.

### Claim 2 (depends on 1)

The semi-trailer as in claim 1, wherein the underride guard assembly comprises at least one second rail disposed below the second side within a second space located forward of the wheels and rearward of the retractable support, wherein the at least one second rail extends over at least half of the distance between the wheels and the retractable support in the longitudinal dimension, and wherein the at least one second rail is pivotably attached to the wheeled chassis so that the at least one second rail is pivotable, from a second position with respect to the wheeled chassis and away from the center of the wheeled chassis, upon application of an upward force to the second rail and is pivotable back to the second position in absence of the upward force to the second rail.

### Claim 3

A semi-trailer, comprising:
a wheeled chassis having a forward end, a rearward end, a first side extending between the forward end and the rearward end, a second side extending between the forward end and the rearward end opposite the first side, at least one wheeled axle at the rearward end, and a retractable support at the forward end, wherein the wheeled chassis is elongated in a longitudinal dimension from the forward end to the rearward end;
a cargo deck supported by the wheeled chassis; and
an underride guard assembly attached to the wheeled chassis and comprising
an elongated first brace member and an elongated second brace member, each having a first end pivotably attached to the wheeled chassis and a second end opposite the first end, wherein each of the first brace member and the second brace member extends from the first end thereof to the second end thereof downwardly from the wheeled chassis and outwardly away from a center of the wheeled chassis between the first side and the second side,
a rail extending between the second ends of the first brace member and the second brace member,
wherein each of the first brace member and the second brace member is pivotable upwardly about an axis passing through the first end of the first brace member and the first end of the second brace member,
a first stop disposed operatively between the first brace member and the wheeled chassis so that the first stop blocks the first brace member from pivoting downward about the axis and toward the center in response to a force to the first brace member that is transverse to the longitudinal dimension and toward the center, and
a second stop disposed operatively between the second brace member and the wheeled chassis so that the second stop blocks the second brace member from pivoting downward about the axis and toward the center in response to a force to the second brace member that is transverse to the longitudinal dimension and toward the center.

### Claim 4 (depends on 3)

The semi-trailer as in claim 3, wherein the wheeled chassis has a plurality of elongated support members that extend across the wheeled chassis transverse to the longitudinal dimension and that support the cargo deck, and wherein each of the first brace member and the second brace member is pivotably attached to a corresponding said support member.

### Claim 5 (depends on 3)

The semi-trailer as in claim 3, comprising a body disposed on the wheeled chassis, wherein the body encloses a cargo area above the cargo deck.

### Claim 6 (depends on 3)

The semi-trailer as in claim 3, wherein the wheeled chassis and the cargo deck comprise a platform trailer.

### Claim 7 (depends on 3)

The semi-trailer as in claim 3, wherein the first brace member and the second brace member are tubular.

### Claim 8 (depends on 3)

The semi-trailer as in claim 3, wherein the first brace member and the second brace member each has a substantially-rectangular cross-section.

### Claim 9 (depends on 4)

The semi-trailer as in claim 4, wherein each of the first brace member and the second brace member forms an interior angle with the corresponding support members of the wheeled chassis in a range between about 30° to about 60°.

### Claim 10

A semi-trailer, comprising:
a wheeled chassis having a forward end, a rearward end, a first side extending between the forward end and the rearward end, a second side extending between the forward end and the rearward end opposite the first side, at least one wheeled axle at the rearward end, and a retractable support at the forward end, wherein the wheeled chassis is elongated in a longitudinal dimension from the forward end to the rearward end;
a cargo deck supported by the wheeled chassis; and
an underride guard assembly attached to the wheeled chassis and comprising
an elongated first brace member and an elongated second brace member, each having a first end pivotably attached to the wheeled chassis and a second end opposite the first end, wherein each of the first brace member and the second brace member extends from the first end thereof to the second end thereof downwardly from the wheeled chassis and outwardly away from a center of the wheeled chassis between the first side and the second side, and
a rail extending between the second ends of the first brace member and the second brace member,
wherein each of the first brace member and the second brace member is pivotable upwardly about an axis passing through the first end of the first brace member and the first end of the second brace member, and
wherein the rail is a cable.

### Claim 11 (depends on 10)

The semi-trailer as in claim 10, wherein the cable is disposed in a loop having a lower portion extending between the second ends of the first brace member and the second brace member, an upper portion extending between ends of the support members to which the first brace member and the second brace member are attached, and side portions extending between the upper portion and the lower portion.

### Claim 12 (depends on 11)

The semi-trailer as in claim 11, wherein the cable passes through apertures defined in the second end of the first brace member, the second end of the second brace member, and the ends of the support members to which the first brace member and the second brace member are attached.

### Claim 13 (depends on 11)

The semi-trailer as in claim 11, the underride guard assembly further comprising at least one horizontally elongated first web connected to, and extending between, the second end of the first brace member and the second end of the second brace member.

### Claim 14 (depends on 13)

The semi-trailer as in claim 13, the underride guard assembly further comprising at least one vertically elongated second web connected to, and extending between, the upper portion and the lower portion of the loop, the at least one first web and the at least one second web being affixed to each other.

### Claim 15

A semi-trailer, comprising:
a wheeled chassis having a forward end, a rearward end, a first side extending between the forward end and the rearward end, a second side extending between the forward end and the rearward end opposite the first side, at least one wheeled axle at the rearward end, and a retractable support at the forward end;
a cargo deck supported by the wheeled chassis, wherein the wheeled chassis has a plurality of elongated support members that extend across the wheeled chassis transverse to the longitudinal dimension and that support the cargo deck; and
an underride guard assembly attached to the wheeled chassis and comprising
an elongated first brace member and an elongated second brace member, each having a first end pivotably attached to a corresponding said support member and a second end opposite the first end, wherein each of the first brace member and the second brace member extends from the first end thereof to the second end thereof downwardly from the wheeled chassis and outwardly away from a center of the wheeled chassis between the first side and the second side,
a rail extending between the second ends of the first brace member and the second brace member,
wherein each of the first brace member and the second brace member is pivotable upwardly about an axis passing through the first end of the first brace member and the first end of the second brace member
a first, and
a second strap,
wherein each of the first strap and the second strap has a first end secured to a corresponding one of the first brace member and the second brace member and a second end secured to a corresponding one of the support members to which the first brace member and the second brace member are attached.

### Claim 16

A semi-trailer, comprising:
a wheeled chassis having a forward end, a rearward end, a first side extending between the forward end and the rearward end, a second side extending between the forward end and the rearward end opposite the first side, at least one wheeled axle at the rearward end, and a retractable support at the forward end, wherein the wheeled chassis is elongated in a longitudinal dimension from the forward end to the rearward end;
a cargo deck supported by the wheeled chassis; and
an underride guard assembly comprising
an elongated first brace member and an elongated second brace member, each having a first end pivotably attached to the wheeled chassis and a second end opposite the first end, wherein each of the first brace member and the second brace member extends from the first end thereof to the second end thereof downwardly from the wheeled chassis and outwardly away from a center of the wheeled chassis between the first side and the second side, and
at least one horizontally elongated web connected to and extending between the second ends of the first brace member and the second brace member,
wherein each of the first brace member and the second brace member is pivotable upwardly about an axis passing through the first end of the first brace member and the first end of the second brace member,
a first stop disposed operatively between the first brace member and the wheeled chassis so that the first stop blocks the first brace member from pivoting downward about the axis and toward the center in response to a force to the first brace member that is transverse to the longitudinal dimension and toward the center, and
a second stop disposed operatively between the second brace member and the wheeled chassis so that the second stop blocks the second brace member from pivoting downward about the axis and toward the center in response to a force to the second brace member that is transverse to the longitudinal dimension and toward the center.

### Claim 17 (depends on 16)

The semi-trailer as in claim 16, wherein the at least one horizontally elongated web comprises a plurality of horizontally elongated webs.

### Claim 18 (depends on 16)

The semi-trailer as in claim 16, wherein the wheeled chassis has a plurality of elongated support members that extend across the wheeled chassis transverse to the longitudinal dimension and that support the cargo deck, and wherein each of the first brace member and the second brace member is pivotably attached to a corresponding said support member.

### Claim 19 (depends on 16)

The semi-trailer as in claim 16, comprising a body dispersed on the wheeled chassis, wherein the body encloses a cargo area above the cargo deck.

### Claim 20 (depends on 16)

The semi-trailer as in claim 16, wherein the wheeled chassis and the cargo deck comprise a platform trailer.

### Claim 21

A semi-trailer, comprising:
a wheeled chassis having a forward end, a rearward end, a first side extending between the forward end and the rearward end, a second side extending between the forward end and the rearward end opposite the first side, at least one wheeled axle at the rearward end, and a retractable support at the forward end, wherein the wheeled chassis is elongated in a longitudinal dimension from the forward end to the rearward end;
a cargo deck supported by the wheeled chassis; and
an underride guard assembly comprising
an elongated first brace member and an elongated second brace member, each having a first end pivotably attached to the wheeled chassis and a second end opposite the first end, wherein each of the first brace member and the second brace member extends from the first end thereof to the second end thereof downwardly from the wheeled chassis and outwardly away from a center of the wheeled chassis between the first side and the second side,
at least one horizontally elongated web connected to and extending between the second ends of the first brace member and the second brace member, and
at least one vertically elongated web connected to, and extending between, one of the first side and the second side and the at least one horizontally elongated web,
wherein each of the first brace member and the second brace member is pivotable upwardly about an axis passing through the first end of the first brace member and the first end of the second brace member.

### Claim 22 (depends on 21)

The semi-trailer as in claim 21, wherein the at least one vertically elongated web comprises a plurality of vertically elongated webs.

### Claim 23

A semi-trailer, comprising:
a wheeled chassis having a forward end, a rearward end, a first side extending between the forward end and the rearward end, a second side extending between the forward end and the rearward end opposite the first side, at least one wheeled axle at the rearward end, and a retractable support at the forward end, wherein the wheeled chassis is elongated in a longitudinal dimension from the forward end to the rearward end;
a cargo deck supported by the wheeled chassis, wherein the wheeled chassis has a plurality of elongated support members that extend across the wheeled chassis transverse to the longitudinal dimension and that support the cargo deck; and
an underride guard assembly comprising
an elongated first brace member and an elongated second brace member, each having a first end pivotably attached to a corresponding said support member and a second end opposite the first end, wherein each of the first brace member and the second brace member extends from the first end thereof to the second end thereof downwardly from the wheeled chassis and outwardly away from a center of the wheeled chassis between the first side and the second side,
at least one horizontally elongated web connected to and extending between the second ends of the first brace member and the second brace member, and
a cable disposed in a loop having a lower portion extending between the second ends of the first brace member and the second brace member, an upper portion extending between ends of the support members to which the first brace member and the second brace member are attached, and side portions extending between the upper portion and the lower portion,
wherein each of the first brace member and the second brace member is pivotable upwardly about an axis passing through the first end of the first brace member and the first end of the second brace member.

### Claim 24 (depends on 23)

The semi-trailer as in claim 23, wherein the cable passes through apertures defined in the second end of the first brace member, the second end of the second brace member, and the ends of the support members to which the first brace member and the second brace member are attached.