Abstract: A bellows has a first portion that is formed with a hollow protrusion and can be actuated by pressing on it and a second portion formed with an annular wall defining an opening. The hollow protrusion fits within the opening. Actuation of the first portion causes a fluid to flow through the hollow protrusion and opening, and the fluid tends to force the protrusion against the annular wall. In another embodiment, the first and second portions are sealed along planer front and rear walls. A nut us provided having teeth for clamping the device to an air tube. The bellows can be used to control any device, including a pressure switch, valve or gauge, that is controlled by a change in fluid pressure applied thereto.

Abstract: A bellows has a first portion that is formed with a hollow protrusion and can be actuated and a second portion formed with an annular wall defining an opening. The hollow protrusion fits within the opening. Actuation of the first portion causes a fluid to flow through the hollow protrusion and opening, and the fluid tends to force the protrusion against the annular wall. In another embodiment, the first and second portions are sealed along planer front end rear walls. A nut is provided having teeth for clamping the device to an air tube. The device can be used in hot tubs, saunas, on vending machines, and has many medical uses.

Abstract: Apparatus is provided for housing the controls for an electric circuit and a light indicator which is driven by the electric circuit. The electric circuit and light indicator are employed in proximity to a spa, whirlpool bathtub, hot tub or the like, and the apparatus is intended for operation by a human operator in contact with water. A front plate or display plate which is at least partially transparent or translucent is mounted on the tub in proximity to the water and helps to separate the electric circuit and light indicator from the water. The housing is mounted on a side of the plate away from the water and has a front portion which is at least partially transparent or translucent and in opposed relation to the plate, a rear edge portion spaced away from the plate, and an intermediate skirt portion connecting the front and rear portions. The housing is formed in one piece and has an opening defined by the rear edge portion to facilitate insertion of the light indicator into the housing.

Abstract: A fluid controlled actuating device is described which facilitates rapid and controllable actuation of devices adapted for momentary actuation.