An engagement chain has two chain members. Each of the chain members includes link plates, each of which has two pin holes, and coupling pins. The two pin holes are aligned in the advancing/retreating direction and are sized differently from each other. Each of the coupling pins of each chain member is tightly received in the smaller pin hole of the two pin holes of one of any adjacent two of the link plates in the advancing/retreating direction and is loosely received in the larger pin hole of the two pin holes of the other one of the two adjacent link plates. In a state in which the chain members are integrated with each other, any two of the coupling pins that are opposed to each other are in the same received states in the corresponding pin holes.

An engagement chain has two chain members. Each of the chain members includes link plates, each of which has two pin holes, and coupling pins. The two pin holes are aligned in the advancing/retreating direction and are sized differently from each other. Each of the coupling pins of each chain member is tightly received in the smaller pin hole of the two pin holes of one of any adjacent two of the link plates in the advancing/retreating direction and is loosely received in the larger pin hole of the two pin holes of the other one of the two adjacent link plates. In a state in which the chain members are integrated with each other, any two of the coupling pins that are opposed to each other are in the same received states in the corresponding pin holes.

The invention relates to a straightening bench for a vehicle chassis and body, characterised in that it comprises: a vehicle lift with four beams, including two longitudinal beams and two crossbeams interconnected in pairs, each of the two crossbeams being linked to two lifting columns. Also disclosed are means for fastening the vehicle to the longitudinal beams of the straightening bench, these fastening means being capable of attaching a vehicle resting on its wheels to the longitudinal beams.

The invention relates to a straightening bench for a vehicle chassis and body, characterised in that it comprises: a vehicle lift with four beams, including two longitudinal beams and two crossbeams interconnected in pairs, each of the two crossbeams being linked to two lifting columns. Also disclosed are means for fastening the vehicle to the longitudinal beams of the straightening bench, these fastening means being capable of attaching a vehicle resting on its wheels to the longitudinal beams.

A platform twist mitigation apparatus operable to extend jacks into engagement with a surface disposed below a platform carrying the jacks, and to alternately extend and retract the jacks to change platform attitude relative to the surface. Tilt sensors are supported at spaced locations on the platform. An electronic control module is programmed to detect a platform twist condition in response to angle data received from the tilt sensors and to mitigate the platform twist condition by operating or modifying the operation of the jacks.

A jack apparatus is provided for lifting a low rider vehicle, even though the vehicle has very low ground clearance. The jack apparatus includes interfitting upper and lower subframes supported by a scissor lift. The upper subframe includes opposing parallel arms shaped to fit within a generally triangular cavity defined by the vehicle's tire and sheet metal and ground surface, such that the jack apparatus can engage the vehicle's tire and lift the vehicle without violating the generally triangular cavity, thus leading to a safer and better system for lifting the low rider without potentially damaging vehicle's sheet metal components. The jack apparatus includes width-adjustable arms and legs for flexible use, which are removable or collapsible to a very low shape for compact storage. Also, the upper subframe includes a table, allowing it to lift an ATV or motorcycle.

A maintenance vehicle (10) for a storage and retrieval system including storage racks arranged so as to form at least one circulation aisle between two respective storage racks, the storage racks include vertical uprights. The maintenance vehicle (10) includes a chassis (11) able to move on a floor in the at least one circulation aisle, a platform (12) coupled to the chassis (11) and intended to receive an operator, a guardrail (13) mounted on the platform (12), and an ascent and descent system (14) with an engagement member configured to cooperate with the uprights facing the respective circulation aisle so as to drive the ascent and descent of the maintenance vehicle (10) in a vertical direction.

A maintenance vehicle (10) for a storage and retrieval system including storage racks arranged so as to form at least one circulation aisle between two respective storage racks, the storage racks include vertical uprights. The maintenance vehicle (10) includes a chassis (11) able to move on a floor in the at least one circulation aisle, a platform (12) coupled to the chassis (11) and intended to receive an operator, a guardrail (13) mounted on the platform (12), and an ascent and descent system (14) with an engagement member configured to cooperate with the uprights facing the respective circulation aisle so as to drive the ascent and descent of the maintenance vehicle (10) in a vertical direction.

A lift assembly having a base, a platform moveable relative to the base between a raised position and a lowered position, and a scissor mechanism coupled to the base and to the platform to move the platform relative to the base. The scissor mechanism includes a first arm, a second arm, a third arm, and a fourth arm supported by the base and extending toward the platform. The first and second arms, as well as the third and fourth arms, are pivotable relative to one another to define a pair of scissor arms to assist the platform in moving between the raised position and the lowered position. A drive mechanism is disposed between the pairs of scissor arms to move the platform between the raised position and the lowered position. The drive mechanism includes a carriage coupled to the base such that the drive mechanism is moveable relative to the base.

A lift assembly having a base, a platform moveable relative to the base between a raised position and a lowered position, and a scissor mechanism coupled to the base and to the platform to move the platform relative to the base. The scissor mechanism includes a first arm, a second arm, a third arm, and a fourth arm supported by the base and extending toward the platform. The first and second arms, as well as the third and fourth arms, are pivotable relative to one another to define a pair of scissor arms to assist the platform in moving between the raised position and the lowered position. A drive mechanism is disposed between the pairs of scissor arms to move the platform between the raised position and the lowered position. The drive mechanism includes a carriage coupled to the base such that the drive mechanism is moveable relative to the base.