Abstract: A spring system that includes an adjustable spring system that is operated by a motor.

Abstract: A spring system that includes an adjustable spring system that is operated by a motor.

Abstract: A spring system that includes an adjustable spring system that is operated by a motor.

Abstract: A spring system that includes an adjustable spring system that is operated by a motor.

Abstract: A spring system that includes an adjustable spring system that is operated by a motor.

Abstract: A spring system that has first and second housings and a first mechanical spring connected to the first and second housings. The first and second housings each have a front portion having a front end and rear portion having a rear end and an internal chamber. The front end of the second housing is telescopically inserted into the internal chamber of the first housing. The first mechanical spring is at least partially positioned in the internal chamber of the first and second housings. The first end of the first mechanical spring is connected to a first connection arrangement in the first housing. The second end of the first mechanical spring is connected to a second connection arrangement in the second housing. The first and/or second connection arrangement threadedly engages the first mechanical spring.

Abstract: A spring system that has first and second housings and a first mechanical spring connected to the first and second housings. The first and second housings each have a front portion having a front end and rear portion having a rear end and an internal chamber. The front end of the second housing is telescopically inserted into the internal chamber of the first housing. The first mechanical spring is at least partially positioned in the internal chamber of the first and second housings. The first end of the first mechanical spring is connected to a first connection arrangement in the first housing. The second end of the first mechanical spring is connected to a second connection arrangement in the second housing. The first and/or second connection arrangement threadedly engages the first mechanical spring.

Abstract: A spring system for relatively displacing elements attached to end mounts of the rod assembly comprises a housing having a rod member movable between extended and retracted positions relative thereto, and a first compression spring in the housing surrounded by a second compression spring for biasing the rod member to one of an extended or retracted position relative to the housing. The two springs are oppositely wound whereby, from a compressed condition, the spring rod exerts an expansion force which increases at a linear rate. The spring system includes a valve arrangement to control the rate at which the spring rod moves from a retracted position to an extended position.

Abstract: A lift spring assembly has a compression spring rod with a housing having a longitudinal axis and axially opposite ends, and having a rod member coaxial with the axis and having an inner end in the housing and an outer end axially outwardly of one of the opposite ends. A guide member is provided on the inner end of the rod member for supporting the rod member during movement of the rod member. A first stage spring assembly extends between one of the opposite ends of the housing and the guide member. A second stage spring assembly extends between the other of the opposite ends of the housing and the guide member. A mounting member extending from one of the opposite ends of the housing for mounting the spring rod assembly to a hood assembly. A locking member is pivotally connected to the mounting member and pivots into locking engagement with one of the ends of the housing.

Abstract: A force control strut including a housing having first and second ends and an internal chamber, a rod member having an inner end reciprocally movable inside the housing and along the internal chamber, a guide member allowing reciprocation of the rod member in the housing, a bottom portion fixed in the internal chamber, a guide piston secured to an inner end of the rod and slidable along an inner surface of the internal chamber, a first coil spring positioned between the guide piston and one end of the housing to bias the rod member in a given direction in the housing, a first external connector fixed to the rod member, a second connector fixed to the bottom portion, and a damper that includes a plunger reciprocally mounted in a force controlling passageway inside the rod member and movable in a passageway of the rod member.

Abstract: A force control strut including a housing having first and second ends and an internal chamber, a rod member having an inner end reciprocally movable inside the housing and along the internal chamber, a guide member forming a bushing allowing reciprocation of the rod member in the housing, a bottom plug fixed in the internal chamber, a guide piston secured to an inner end of the rod and slidable along an inner surface of the internal chamber, a first coil spring positioned between the guide piston and one end of the housing to bias the rod member in a given direction in the housing, a first external connector fixed to the rod member, a second connector fixed to the bottom plug, and a damper that includes a plunger reciprocally mounted in a force controlling passageway inside the rod member and movable in a passageway of the rod member.

Abstract: A compression spring rod for relatively displacing elements attached to end mounts of the rod assembly comprises a housing having a rod member moveable between extended and retracted positions relative thereto, and a first compression spring in the housing surrounded by a second compression spring for biasing the rod member to one of an extended or retracted position relative to the housing. The two springs are oppositely wound, of different length, of different outside diameter, and of different wire diameter whereby, from a compressed condition, the spring rod exerts an expansion force which increases at a linear rate. Two sets of the springs can be arranged for biasing the rod member to a central position relative to the housing.

Abstract: A positive lock mechanism having a compression spring rod with a housing, a rod member having an inner end in said housing and an outer end axially outwardly of a housing end. One or more compression springs extend between a guide member and an end of the housing. A positive locking mechanism is provided to prevent movement of the rod member in a longitudinal direction. The lock mechanism is controlled by a wire and cable assembly operated by a lever.

Abstract: A strut assembly having first and second mounting members extending from opposite ends of the housing for mounting the strut assembly to a hood assembly. A locking member is connected to the housing and slides into locking engagement with the rod member. Restraining members are secured to the mounting members to prevent unwanted travel of the hood assembly beyond a fully opened position.

Abstract: A spring system for relatively displacing elements attached to end mounts of the spring system. The spring system includes a housing having an axis, an internal chamber, and axially opposite bottom and top ends, a spring rod coaxial with the axis and positioned within the internal chamber and having an inner end in the housing and an outer end axially outwardly of the top end. A guide member is provided on the inner end of the rod member to support the rod member for reciprocation axially of the housing between retracted and extended positions relative thereto. A locking arrangement is provided to engage the spring rod and inhibit axial movement of the spring rod.

Abstract: A lift spring assembly has a compression spring rod with a housing having a longitudinal axis and axially opposite ends, and having a rod member coaxial with the axis and having an inner end in the housing and an outer end axially outwardly of one of the opposite ends. A guide member is provided on the inner end of the rod member for supporting the rod member during movement of the rod member. A first stage spring assembly extends between one of the opposite ends of the housing and the guide member. A second stage spring assembly extends between the other of the opposite ends of the housing and the guide member. A mounting member extending from one of the opposite ends of the housing for mounting the spring rod assembly to a hood assembly. A locking member is pivotally connected to the mounting member and pivots into locking engagement with one of the ends of the housing.

Abstract: A positive lock mechanism having a compression spring rod with a housing, a rod member having an inner end in said housing and an outer end axially outwardly of a housing end. One or more compression springs extend between a guide member and an end of the housing. A positive locking mechanism is provided to prevent movement of the rod member in a longitudinal direction. The lock mechanism is controlled by a wire and cable assembly operated by a lever.

Abstract: A self-centering mechanical strut has first and second housing members. The second housing member telescopically receives the first housing member. Spring assemblies are mounted within each of the housing members. The spring assembly in the first tube is compressed when the first housing is pushed into the second housing. The spring assembly in the second tube is compressed when the first housing is pulled out of the second housing. Each housing is spring-biased to return to its respective neutral position.

Abstract: A spring system for relatively displacing elements attached to end mounts of the rod assembly comprises a housing having a rod member movable between extended and retracted positions relative thereto, and a first compression spring in the housing surrounded by a second compression spring for biasing the rod member to one of an extended or retracted position relative to the housing. The two springs are oppositely wound whereby, from a compressed condition, the spring rod exerts an expansion force which increases at a linear rate. The spring system includes a valve arrangement to control the rate at which the spring rod moves from a retracted position to an extended position.

Abstract: A shock absorber for use between the reciprocating member of an oil well pumping mechanism and a polish rod connected to the rod spring and movable along a vertical pumping axis. The shock absorber comprises an upper and lower end plate having a peripheral surface around the plumping axis and defining a polish rod clearance opening. A coil spring is located between the plates and is concentric with and surrounding the pumping axis. A friction reducing centering head secured to at least one of the plates (preferably the lower plates) centers polish rod in the clearance opening and holds the polish rod away from the peripheral wall of the plate.