A breakaway hinge assembly includes a first bracket coupled to a boom section, a second bracket coupled to a breakaway boom section, and a damper system. The damper system includes a first damper assembly coupled to a stop bracket of the first bracket and a second damper assembly coupled to an upper bracket arm of the first bracket. Each damper assembly includes a housing, at least one rubber element disposed within the housing, a plunger having a first end in contact with the at least one rubber element, and a stop coupled to a second end of the plunger. The first and second brackets are pivotably coupled to each other so that the breakaway boom section pivots between a first position and a second position. The damper system is configured to prevent over-pivoting and reduce impact load of the breakaway boom section when pivoting to the first and second positions.

A method and apparatus for reducing a force. An apparatus comprises a multi-directional joint assembly and a damper associated with the multi-directional joint assembly. The multi-directional joint assembly has a first end and a second end. The first end and the second end move relative to each other. The damper is comprised of a number of elastomeric layers and a number of rigid layers interspersed with each other reducing at least one of a force and a moment.

A damping bearing (20) including an inner ball portion (34) attached to an end of a support shaft (32), and an outer collar portion (30) attached to a housing (22) for rotation of the housing relative to the support shaft about a center point. A chamber (28) for a damping fluid such as grease is defined by clearance between the end of the shaft and the housing. The fluid chamber has opposed bounding surfaces (29, 37) that are non-spherical about the center of rotation so that the chamber changes shape upon rotation of the bearing, thus shifting damping fluid across the chamber. The chamber may be a flat cylindrical void normal to a centerline (33) of the shaft. It may provide only enough clearance for less than ±10 of relative rotation between the housing and shaft. A set-screw (26) may pressurize the fluid in the chamber.

The present disclosure discloses a variable torsion spring damping rotating shaft. The shaft includes a movable unit, a fixed unit, a first connection mechanism, a second connection mechanism, and a torsion spring; the fixed unit is detachable in inserting connection with the movable unit; the first connection mechanism is arranged inside the fixed unit, and the first connection mechanism is connected to an end of the fixed unit; the torsion spring is sleeved on the first connection mechanism, an end of the torsion spring is in inserting connection with the fixed unit, and another end of the torsion is in inserting connection with the movable unit; the second connection mechanism is arranged in the movable unit and is in cooperation with the first connection mechanism; and the second connection mechanism is configured to rotate on the first connection mechanism, to drive the movable unit to move towards the fixed unit.

A chair backrest swing structure includes a chassis connecting seat, a backframe connecting seat and an elastic buffer and reset member. The chassis connecting seat is configured to be cooperatively mounted with a chassis. The backframe connecting seat is configured to be cooperatively mounted with a backframe. The backframe connecting seat is rotatably cooperated with the chassis connecting seat. The elastic buffer and reset member is configured to enable that the backframe connecting seat may implement buffer and reset when swung left and right on the chassis connecting seat.

A service door for a cowl for an outboard marine propulsion device that includes a door panel that is positionable in an open position and in a closed position. A first hinge rotatably couples the door panel to the cowl. A biasing device operates in conjunction with the first hinge and biases the door panel towards the open position. A second hinge rotatably couples the door panel to the cowl and at least one of the first hinge and the second hinge provides only one shear of rotation between the door panel and the cowl. A damper operates in conjunction with the second hinge and resists rotation of the door panel towards the open position. The inside of the cowl is accessible when the door panel is in the open position and inaccessible when the door panel is in the closed position.

A breakaway hinge assembly includes a first bracket coupled to a boom section, a second bracket coupled to a breakaway boom section, and a damper system. The damper system includes a first damper assembly coupled to a stop bracket of the first bracket and a second damper assembly coupled to an upper bracket arm of the first bracket. Each damper assembly includes a housing, at least one rubber element disposed within the housing, a plunger having a first end in contact with the at least one rubber element, and a stop coupled to a second end of the plunger. The first and second brackets are pivotably coupled to each other so that the breakaway boom section pivots between a first position and a second position. The damper system is configured to prevent over-pivoting and reduce impact load of the breakaway boom section when pivoting to the first and second positions.

The present disclosure discloses a variable torsion spring damping rotating shaft. The shaft includes a movable unit, a fixed unit, a first connection mechanism, a second connection mechanism, and a torsion spring; the fixed unit is detachable in inserting connection with the movable unit; the first connection mechanism is arranged inside the fixed unit, and the first connection mechanism is connected to an end of the fixed unit; the torsion spring is sleeved on the first connection mechanism, an end of the torsion spring is in inserting connection with the fixed unit, and another end of the torsion is in inserting connection with the movable unit; the second connection mechanism is arranged in the movable unit and is in cooperation with the first connection mechanism; and the second connection mechanism is configured to rotate on the first connection mechanism, to drive the movable unit to move towards the fixed unit.

A service door for a cowl for a marine propulsion device. A door panel is positionable in open and closed positions. A first hinge rotatably couples the door panel to the cowl. A coil spring biases the door panel towards the open position and a damper resists rotation of the door panel towards the open position. The first hinge rotates about a first axis and has a first hinge base, a first hinge axle, and a first hinge axle opening that receives the first hinge axle. The first hinge axle has base and distal ends. The base end is coupled to the first hinge base and the distal end has a spring slot. The coil spring has fixed and rotating ends. The rotating end imparts a spring force on the door panel with the fixed end in the spring slot.

A method and apparatus for reducing a force. An apparatus comprises a multi-directional joint assembly and a damper associated with the multi-directional joint assembly. The multi-directional joint assembly has a first end and a second end. The first end and the second end move relative to each other. The damper is comprised of a number of elastomeric layers and a number of rigid layers interspersed with each other reducing at least one of a force and a moment.