Abstract: An auxiliary vehicle body support and leveler device of the type commonly known as a load leveling shock absorber includes a non-magnetic cover fixed to the vehicle body, a pair of magnetic strips vertically aligned and separated on the outer surface of the cover and a pair of magnetic reed switches, one associated with each magnetic strip, the reed switches being horizontally disposed with one reed adjacent the respective magnetic strip so that the reed switch closes in respond to the presence of a magnetic pole anywhere along the strip. The device also includes a main body fixed to the vehicle running gear and defining a variable volume chamber with the cover, the main body having mounted thereon, within the cover, a permanent magnet disposed with one pole adjacent the magnetic strips and adapted to move vertically between the strips as the main body and cover move relative to one another.

Abstract: A fluid reservoir is made of non magnetic material and comprises two chambers communicating with a common well. A float is disposed in the well and bears a permanent magnet, and a switch is disposed outside the reservoir. The switch is actuated by the magnetic field of the magnet when the float is at a predetermined level in the reservoir.

Abstract: A water system for a mobile vehicle has an intermittent external source of water and uses water from an internal storage tank to provide a continuous supply of water. A water storage refill system automatically refills the internal storage tank whenever there is an external source of water. An inlet conduit is detachably connectable to an external water supply and in communication with the internal storage tank and the remainder of a plumbing system. An electrically actuated valve in the inlet conduit controls the flow of water from the external source of water to the internal storage tank in response to sensing devices indicating the need for water in the storage tank and the availability of water from the external water source.

Abstract: A liquid level alarm apparatus for a tank of a vehicle comprising a float having a permanent magnet, a pair of electrical contacts opened or closed in response to the proximity of said magnet, and a stopper for limiting the upward movement of the float, said contacts being connected by leads to an electric circuit comprising an alarm device. The contacts are maintained in a closed condition when the liquid in the tank is above a predetermined level and the contacts are separated, which operates the alarm of the alarm device, when the liquid in the tank is below the predetermined level.

Abstract: A device for transferring water from a standard five gallon water bottle to a dispenser spout, without the need for lifting the bottle and inverting it atop the dispenser, comprises a bottle pressurizing agent, ducting to carry water from the bottle to the dispenser and various control sensor and indicator means to control pressurant and water flow so that potable water from the dispenser is available on demand.

Abstract: A liquid level signaling electrical switch operated by a float protected within a container in the tank being monitored for level so that only slow changes in level are allowed to influence the float position thereby substantially eliminating flickering of the signal lamp upon sudden changes in tank level at the float due to bump vibration, hill angulation, turns, and sudden starts and stops shifting the liquid in the tank off true gravational level. The float closes the switch at substantially true refill level by locating a magnet closer to an armature when the switch closes so that the magnet exerts strong magnetic force holding the switch closed thus also preventing flickering of the signal lamp. The float container and switch are integrated in a removable assembly together with a liquid supply tube, filter foot, and base connector so that complete assembly of parts is feasible outside the tank obviating separately installing parts in the tank.

Abstract: A fluid level alarm device which is capable of warning a person of a shortage in level of an operating fluid stored in a fluid tank and in which the critical fluid level at which an alarm signal is produced is determined with a maximized accuracy by positioning a magnetically operable reed switch, electrically connected to an alarm, within the tank at a predetermined vertical location in a manner so that, when the fluid stored in the tank is lowered below a specified level, said reed switch is magnetically closed to operate the alarm.

Abstract: The control for electric sump pumps is operated by a pair of weights operatively attached to the control which has a sealed non-magnetic material housing having a downwardly open recess extending thereinto from its lower surface. A normally open microswitch having a spring control arm extending therefrom and movable downwardly to close the switch, while a permanent magnet is positioned on the arm directly above the recess, and a magnetic metal means is slidably positioned in the recess and operatively connects to the weights. The magnetic metal means attracts the permanent magnet when the metal means is at the upper portion of the recess and this closes the switch arm with the position of the metal means in the housing in relation to the magnet being controlled dependent upon the water level in the sump.

Abstract: Liquid level detectors known in the art are, for the most part, designed so that they are mounted in a vertical direction to the liquid level. However, with the recent trend toward using liquid containers of more complicated shapes, there has existed a need for a liquid level detector of a type that can be mounted in a horizontal direction with respect to the liquid level. Moreover, there has existed a need for a liquid level detector of a type which requires as small a mounting opening as possible. In accordance with the present invention, there is provided a liquid level detector in which a permanent magnet is fixedly mounted on the central portion of a float having a long and slender shape, e.g., elliptic or rectangular shape and being enabled to slide along a case containing a reed switch therein and to positively bring the reed switch into operation to detect the liquid level, and which thus meets the above-mentioned requirements.

Abstract: The invention contemplates position-indicating means particularly applicable to producing an electrical indication of liquid level and employing one or more magnetic-reed switches at a selected one or more fixed positions or levels to be monitored. The switches may be in longitudinally spaced array within a single elongate housing, for proximity response to the field of a magnetized actuator element as it assumes various longitudinal positions external to and along the housing. At each switch station, a magnetic-latch element, which is the means of magnetically actuating the switch contacts, has limited freedom of longitudinal displacement into and out of its region of switch actuation.

Abstract: A liquid-level detecting device comprises a float for moving in accordance with the liquid level, a permanent magnet mounted in said float and a reed switch which is fixed to a stationary member and arranged for opening and closing in accordance with the movement of said permanent magnet and a thermoferrite member which is provided near said permanent magnet. The thermoferrite member has a Curie point at a critical temperature where it loses its magnetism thereby cutting an affection of said permanent magnet to said reed switch.

Abstract: A switching magnet is moveable along a row of magnetically operated switches and closes at least one switch opposite the magnet, which switches on a tap of a series circuit of resistors. The value of resistance is converted in an uninterrupted manner into an output of measured values dependent upon the position of the switching magnet.

Abstract: In order to sense the level of oil in a tank coupled through a line to an engine, and to give a warning when the level is low, a detector is provided which includes a pipe section interposed in the line and passing through a chamber. Openings in the pipe section cause the oil to leak into the chamber to form a pool therein. Resting on the pool and rising and falling therewith is a float having a magnet therein. When the oil level is low, the magnet is brought into the proximity of a reed switch at the bottom of the chamber, the switch then being actuated to close an alarm circuit.

Abstract: A liquid level reduction alarm device for a braking liquid reservoir vessel in communication with a brake master cylinder wherein the reservoir is closed at its upper open end by an elastic cover member and an elongated hollow case member is suspended from the cover member into the interior space of the reservoir a magnetically operated reed switch is mounted within the interior of the case member and connected with an alarm circuit including an alarm lamp.

Abstract: The invention is directed to a liquid-level sensor utilizing a ferromagnetic fluid. The magnetic characteristics of the fluid are utilized in a magnetic circuit which generates the output signal and are also useful in the mechanical operation of the sensor. The magnetic characteristics of the ferromagnetic fluid, therefore, serve a twofold purpose in the inventive sensor.

Abstract: The invention is concerned with a float-operated electrical switch assembly comprising a vertical tubular housing, at least the lower end of which is arranged to be open to a liquid the level of which is to be monitored. A float is restrained to move vertically in the housing with changes in the liquid level and a magnet mounted on the float cooperates with a magnetically responsive switch actuator which is contained in a tubular casing of non-magnetic material extending into the housing from the side of the housing. The switch assembly is primarily intended for a low level alarm.

Abstract: An alarm system operative in conjunction with a venocylsis set which includes a drop chamber coupled to the output of a fluid bottle. The alarm system is provided with a float disposed in the drop chamber and responsive to the level of fluid pool therein. A proximity switch sensitive to the float position is removably attached to the exterior of the drop chamber to produce a switching action when the fluid level falls below a predetermined value. An alarm circuit is coupled to the proximity switch to generate a warning signal when the switching action occurs.

Abstract: A liquid level sensing switch has an open ended chamber in an electrically conductive body, has an insulating bushing disposed in the open end of the body chamber and has a contact member extending through the bushing to dispose one end of the contact member in spaced relation to the body at the closed end of the body chamber. An electrically conductive magnetizable ball is disposed in the chamber for movement between a closed circuit position engaging both the body and the contact member and an open circuit position spaced from one of these components. A float is mounted on the body exteriorily of the chamber and carries a magnet so that movement of the float between two positions outside the body in response to change in liquid level is effective to move the ball between open and closed circuit positions within the body chamber.