Abstract: As an example, a walker includes a first leg pair, a second leg pair and a cross beam connecting the first and second leg pairs in a parallel, spaced apart relationship. Each leg pair includes a U-shaped tube defining a front leg and a rear leg. A front strut is telescopically movable within the front leg and extends outwardly therefrom. A rear strut is telescopically movable within the rear leg and extends outwardly therefrom. A mechanical linear actuator includes a rotating element adapted to rotate relative to at least one of the front leg or the rear leg. The rotating element includes an interface with a track on the respective strut relative to which the rotating element rotates, whereby rotational motion of the rotating element translates to corresponding linear motion of the strut.

Abstract: As an example, a walker includes a first leg pair, a second leg pair and a cross beam connecting the first and second leg pairs in a parallel, spaced apart relationship. Each leg pair includes a U-shaped tube defining a front leg and a rear leg. A front strut is telescopically movable within the front leg and extends outwardly therefrom. A rear strut is telescopically movable within the rear leg and extends outwardly therefrom. A mechanical linear actuator includes a rotating element adapted to rotate relative to at least one of the front leg or the rear leg. The rotating element includes an interface with a track on the respective strut relative to which the rotating element rotates, whereby rotational motion of the rotating element translates to corresponding linear motion of the strut.

Abstract: As an example, a walker includes a first leg pair, a second leg pair and a cross beam connecting the first and second leg pairs in a parallel, spaced apart relationship. Each leg pair includes a U-shaped tube defining a front leg and a rear leg. A front strut is telescopically movable within the front leg and extends outwardly therefrom. A rear strut is telescopically movable within the rear leg and extends outwardly therefrom. A mechanical linear actuator includes a rotating element adapted to rotate relative to at least one of the front leg or the rear leg. The rotating element includes an interface with a track on the respective strut relative to which the rotating element rotates, whereby rotational motion of the rotating element translates to corresponding linear motion of the strut.

Abstract: An air maintenance system for use with a pneumatic tire is described. The air maintenance system includes a pumping mechanism that is preferably mounted on the interior surface of a wheel rim to keep the pneumatic tire from becoming underinflated. The pumping mechanism includes at least one dual chamber pump, preferably at least two dual chamber pumps configured in series. More preferably, the dual chamber pumps are driven by an external mass that moves as the tire rotates. The tire's rotational energy operates the pump to ensure the tire cavity is maintained at the desired pressure level. An optional control valve shuts off airflow to the pumping mechanism when the tire cavity pressure is at the desired level.

Abstract: An aerosol valve movable from a closed position to an open position for retaining a product in, and spraying the product from, a container, comprising: a valve cup positioned on a first end of the container that orients the aerosol valve in the container, wherein the valve cup has a lip that defines a valve cup opening into the container; a valve stem disposed in the valve cup opening so that a first portion of the valve stem is disposed above the lip and a second portion of the valve stem is disposed below the lip within the container, the valve stem having an open first end, a closed second end and defining a longitudinal passageway therebetween with the open first end defining an outlet from the passageway of the valve stem, a side of the valve stem defining at least one inlet into the passageway near the closed second end; a resilient seal disposed in the valve cup opening between the valve stem and the lip, wherein the resilient seal comprises a seal body having a first portion disposed above the lip and

Abstract: An aerosol valve movable from a closed position to an open position for retaining a product in, and spraying the product from, a container, comprising: a valve cup positioned on a first end of the container that orients the aerosol valve in the container, wherein the valve cup has a lip that defines a valve cup opening into the container; a valve stem disposed in the valve cup opening so that a first portion of the valve stem is disposed above the lip and a second portion of the valve stem is disposed below the lip within the container, the valve stem having an open first end, a closed second end and defining a longitudinal passageway therebetween with the open first end defining an outlet from the passageway of the valve stem, a side of the valve stem defining at least one inlet into the passageway near the closed second end; a resilient seal disposed in the valve cup opening between the valve stem and the lip, wherein the resilient seal comprises a seal body having a first portion disposed above the lip and

Abstract: A pumping device is used with a pneumatic tire mounted on a tire rim to keep the pneumatic tire from becoming underinflated. The pumping device includes a housing attached to the tire rim, a dynamic mass mechanically confined to radial movement relative to the housing and the tire rim, an intake port for ambient to enter the housing, and an exhaust port for forcing air into a tire cavity of the pneumatic tire for restoring air loss from an inflation volume within the tire cavity.

Abstract: A pumping device is used with a pneumatic tire mounted on a tire rim to keep the pneumatic tire from becoming underinflated. The pumping device includes a housing attached to the tire rim, a dynamic mass mechanically confined to linear movement relative to the housing and the tire rim, the dynamic mass moving in response to shock loads transferred from the tire rim to the dynamic mass and pumping ambient air into the housing, an intake port for ambient air to enter the housing, and an exhaust port for forcing pressurized air into a tire cavity of the pneumatic tire for restoring air loss from an inflation volume within the tire cavity.

Abstract: A pumping device is used with a pneumatic tire mounted on a tire rim to keep the pneumatic tire from becoming underinflated. The pumping device includes a housing attached to the tire rim, a dynamic mass mechanically confined to rotational movement relative to the housing and the tire rim, the dynamic mass moving in response to a minimum angular velocity of the tire rim and pumping ambient air into the housing, an intake port for ambient air to enter the housing, and an exhaust port for forcing pressurized air into a tire cavity of the pneumatic tire for restoring air loss from an inflation volume within the tire cavity.