| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 201 | Liquid level sensor | US183012 | 1994-01-18 | US5426271A | 1995-06-20 | Richard A. Clark; Brad L. Cummins; Timothy K. Erickson; Brian D. Mc Bride; Gary R. O'Brien |
| A liquid level sensor is provided with a single piece pivotable device which is used to move a permanent magnet into and out of the detection zone of a magnetically sensitive component, such as a Hall effect element. The pivotable device comprises a buoyant portion, a magnet holding portion and a pivot portion with arms connecting the pivot portion to the buoyant portion and the magnet holding portion. The pivot portion of the pivotable device is shaped to be received over a fixed post attached to a container. The injection gate of the mold used to form the pivotable device is advantageously located so that the pressures throughout the mold cavity are positive to the action of the foaming agent to result in the buoyant portion of the pivotable device having a significantly lower density than the other portions of the pivotable device. This variable density in a single piece device permits a smaller overall size to be used without sacrificing the sensitivity needed to detect changes in a liquid level. | ||||||
| 202 | Fluid drop detecting reservoir tank | US875806 | 1992-04-30 | US5304852A | 1994-04-19 | Reiji Hiraga; Yoshihiro Nakamura |
| A fluid drop detecting reservoir tank has a float with a magnet which moves down in accordance with a drop in the level of fluid in a reservoir tank. The magnet closes a magnetically operated switch when the fluid reaches a predetermined level so that a predetermined drop in the level of the fluid is detected. The fluid drop detecting reservoir tank is provided with a mount casing for receiving therein a switch casing in which the switch is encased. The reservoir tank is provided with a retainer mechanism arranged between the mount casing and the switch casing for holding the switch casing in the mount casing so as to locate the switch below the magnet and preventing the switch casing from being withdrawn from the mount casing. | ||||||
| 203 | Reservoir tank including float with reed switch unit | US873199 | 1992-04-24 | US5254815A | 1993-10-19 | Toshihiro Nakano; Shinji Sakata |
| A reservoir tank according to the present invention is comprised of a tank body storing an amount of operating fluid, connected to a specific device for supplying thereinto the operating fluid and having a bottom with a hole isolated from the operating fluid; a float movable in the vertical direction according to the variation of the liquid level of the operating fluid; a magnet secured to a lower end of the float; and a reed switch unit assembly having a reed switch with a pair of terminals, a pair of conducting elements connected to the pair of terminals of the reed switch, a connector casing, and a pair of connectors each of which is secured to one end of the connector casing in such a manner that each connector is electrically connected to the respective conducting element. | ||||||
| 204 | Pool pump fail safe switch | US715473 | 1991-06-14 | US5172089A | 1992-12-15 | Jane F. Wright; Robert G. Wright |
| A fluid detection device designed to detect the presence of fluids in a flowing or non-flowing state and having the ability to energize or de-energize large current devices such as a swimming pool pump motor. It is equipped with a fluid detector tube designed to be mounted to a vertical fluid carrying conduit such as an intake to a pump. The fluid detector tube has an internal float with permanent magnet and a normally open magnetic reed switch mounted to its exterior. The float with permanent magnet at its highest vertical position closes the magnetic reed switch's contacts and activates a phase shift network. The current through the reed switch is less than fifteen millamps. The phase shift network forward biases a diac which in turn forward biases a traic. The traic completes the connection from a power source to a large current device. The de-energize state of the traic is stabilized by a snubber network. The energize state of the traic is stabilized by the phase shift network and diac. Which permits the voltage drop across the traic main terminals to be less than 1.5 vac when operating a large current device at 15 amperes and 120 vac. | ||||||
| 205 | Remote indicator attachment kit | US767495 | 1991-09-30 | US5154079A | 1992-10-13 | Peter A. Lupoli |
| A remote indicator attachment kit for use with the mechanical level gauge of an oil tank located in the basement area of a dwelling, to indicate at a remote point the drop in oil level, comprises a magnet attachable to the movable member of the existing mechanical gauge, and a reed switch and mounting that is attachable to the see-through housing of the mechanical gauge, to be influenced by the magnet on the movable member. Circuitry connected to the reed switch and to the remote indicator is energized to provide an indication at the remote point. | ||||||
| 206 | Reservoir for a hydraulic brake system | US173977 | 1988-03-28 | US4843193A | 1989-06-27 | Ludwig Budecker; Gerd Klostermann |
| To improve the denseness of a reservoir telltale sounding device of a reservoir for a hydraulic brake system, while reducing the costs of manufacture and assembly, the plug portion comprises a first face and a second face which are respectively connected, in liquid-tight manner, to the housing of the reservoir telltale sounding device and the cover. | ||||||
| 207 | Device for indicating the filling level in a fluid reservoir | US189857 | 1988-05-03 | US4841107A | 1989-06-20 | Peter Tandler; Rudolf Cezanne |
| Disclosed is a device for indicating the filling level in a fluid reservoir of a hydraulic brake system, wherein a magnet is arranged in a radial recess of the float with the side walls of the recess being provided with retaining means for securing the magnet in its installed position. | ||||||
| 208 | Magnetic fuel tank safety switch | US866886 | 1986-05-23 | US4663540A | 1987-05-05 | Felix Ferrante |
| An electric control element, and more particularly a control that is responsive to a liquid level indicator and is operative to prevent a fuel tank from inadvertently running dry. | ||||||
| 209 | Liquid level sensing switch | US732206 | 1985-05-08 | US4609796A | 1986-09-02 | Rudolph Bergsma |
| A float operated liquid level sensing switch for horizontal mounting in the sidewall of a container is disclosed. The switch can be inserted into an aperture in the sidewall regardless of its circumferential orientation with full assurance that its float is properly oriented to perform the level sensing function. The float is tubular and contains a weighting means which orients the float to a unique circumferential orientation. This positions a magnet on the float to a unique operating range. A reed switch is contained horizontally within a body portion of the switch and is surrounded by the float. The magnet is disposed to operate in a vertical plane relative to the reed switch and when the level drops to a certain level, the float similarly drops causing the magnet to activate the reed switch. In order to attain overlying relationship of the magnet to the reed switch, a pendulum weight is also included on the float diametrically opposite the magnet. The switch and electrical circuitry are isolated from the liquid whose level is being sensed. | ||||||
| 210 | Flexible means for measuring liquid level | US523031 | 1983-08-15 | US4536660A | 1985-08-20 | Roland G. Tetro |
| The invention contemplates a unitary magnetically sensitive circuit element or network and a flexibly articulatable elongate assembly of a plurality of such elements or networks, with electrical interconnection of the same, such assembly being inherently suited to precision operation as a function of length, whatever the length selected for a particular application or use. In one application to liquid-depth indication within a tank, the longate assembly is merely inserted into the tube along which a float-borne permanent magnet is guided, and the magnetically sensitive element of each successive unit is actuated as the float tracks liquid level and is displaced from actuating relation with one and then to the nextadjacent one of the circuit-element units. The connection of circuit-element units is such that electrical-resistance observation from one end of the assembly provides a direct indication of the liquid level at which the float magnet is currently operative. Various forms and a method of manufacture are described. | ||||||
| 211 | Magnetic float controlled electric switch | US395063 | 1982-06-22 | US4499348A | 1985-02-12 | Jan E. Gismervik; Gunnar Sveinsbo |
| Float-controlled electrical switch (11) includes a reed contact (22) which is opened and closed by the field of force of a permanent magnet (32). The permanent magnet is embedded in a float which can be moved by rising and falling liquid levels towards and away from the reed contact for closing and opening of the reed contact. The reed contact (22) cooperates with a relay (25) which provides for engaging and disengaging of a working contact (18) for engagement and disengagement of a bilge pump (10) or another power device in connection with inspection of two separate liquid levels. Provision is made for a large distance between the liquid levels together with markedly distinct positions for engagement and disengagement of the reed contact by allowing the electromagnetic field of force of the coil (24) of the relay (25) to cooperate with the field of force of the permanent magnet. Provision is made in this connection that the field of force of the coil be less than the field of force of the permanent magnet and that the field of force of the coil alone is too weak to maintain the reed contact engaged. Simple components are employed made of rectangular pipe of plastic for constructing the housing part (30) of the switch, the float (31) together with the insert part (35) for installation and possible withdrawal of float from housing part. | ||||||
| 212 | Float assembly for a sensor | US373850 | 1982-05-03 | US4442405A | 1984-04-10 | Raymond J. Andrejasich; Ralph A. Perry |
| A float assembly for a sensor provides a float member having a channel passing therethrough, a mounting for the sensor on the float, a guide passing through the channel for guiding the movement of the float member, a stop including a magnet located on the guide for limiting the movement of the float, and a magnetically activated switch included in the float member for activating when in proximity to the stop magnet for indicating that the float member is in proximity to the stop. | ||||||
| 213 | Explosion-proof device for measuring liquid levels | US303391 | 1981-09-18 | US4384184A | 1983-05-17 | Fernando D. Q. Alvarez |
| A liquid level registering device in a tank of liquid includes a non-magnetic tube surrounded by a movable magnetic float. The tube contains a dielectric oil and reed switches which are fixed at different levels. When the level of liquid carries the magnetic float to the same vertical level as a particular switch, that switch changes its state. | ||||||
| 214 | Float operated electrical switch assembly | US122046 | 1980-02-19 | US4335285A | 1982-06-15 | Norman West |
| A float operated electrical switch assembly has a housing (10) fitted to an opening in a container wall (14). A float (19) follows the liquid level and is pivoted with a primary magnet (18) about a pivot axis (17). A pivotal secondary magnet (21) acts in repulsion with the primary magnet (18) through a non-magnetic wall (20) of the housing (10). The movement of the secondary magnet (21) causes at least one control rod (48) to reciprocate. A switch contact (32) is normally held under the resilience of its carrier leaf spring (38) in engagement with a fixed switch contact (33). The contacts are opened by movement of the control rod (48) moving the switch contact (32) against the resilience of its carrier. | ||||||
| 215 | Delayed action liquid level sensing apparatus | US149265 | 1980-05-12 | US4329550A | 1982-05-11 | Donald Verley |
| A low liquid level float control apparatus particularly adapted for use in vessels or tanks containing a fluid of the type utilized in liquid vending machines is disclosed. An electronic control unit has a probe section extending downwardly therefrom containing a reed switch, which is activated by the passage of an annular magnet vertically along the probe section. A second magnet is secured about the lower most portion of the probe section and is adjustable along the probe section thereby increasing the switch delay time, thus reducing the possibility of intermittent on-off operation of associated pump elements. | ||||||
| 216 | Brake-fluid level detector | US43850 | 1979-05-30 | US4270033A | 1981-05-26 | Alfred Hoffmann |
| A fluid-level detector comprises a container, here a brake-fluid reservoir for an automotive vehicle, adapted to hold a supply of a fluid and containing a float connected via a link arm to a permanent magnet for displacement of the magnet vertically through a predetermined magnet position on vertical displacement of the float through a predetermined float position corresponding to a fluid level at which a signal is to be given. A pair of contacts outside the container can be engaged by a switch element which is displaceable toggle-fashion by the magnet between a closed position engaging and forming a closed circuit with the contacts and an open position out of engagement with at least one of the contacts. A pair of abutments on the container defines a pair of stable end positions for the switch element which respectively correspond to the open and closed positions thereof and establishes an unstable metastable position between the stable positions which corresponds generally to the predetermined magnet position. Thus as the magnet passes through the predetermined magnet position the switch element moves between the open and closed positions. | ||||||
| 217 | Float-level switch with lifting mechanism | US876314 | 1978-02-09 | US4142079A | 1979-02-27 | Albert J. Bachman |
| The invention contemplates remotely operable lifting mechanism for selectively displacing a liquid-level float in a sealed tank, to permit checking of the operational status of the float throughout its displaceable range, and to permit check-out of magnetically operated electrical means actuated by the float at a predetermined float level within its displaceable range. The lifting force is coupled magnetically to the float without interference with the path of float movement and without interference with the magnetically operated electrical means. | ||||||
| 218 | Fluid bilevel sensor | US722023 | 1976-09-10 | US4103265A | 1978-07-25 | Hemming G. Siiberg |
| A fluid bilevel sensor containing a differential float and a magnetically actuatable switch generating an electrical signal upon the occurrence of one fluid level. A thermal time delay delays the application of the electrical signal to a load for a predetermined time. The magnetically actuatable switch removes the electrical signal upon the occurrence of a second fluid level. The thermal time delay delays the removal of the electrical signal from the load for a predetermined time. | ||||||
| 219 | Electro-mechanical liquid level sensor | US725101 | 1976-09-20 | US4090050A | 1978-05-16 | Hemming G. Siiberg |
| An electro-mechanical liquid level sensor is disclosed. The sensor comprises a magnetically operable switch in response to liquid level to complete a circuit for actuating a warning light or the like. The switch comprises a movable electrical contact operative to be moved by magnetic force which is variable in accordance with liquid level whereby the circuit is completed upon a predetermined change in liquid level. The movable parts of the sensor and the structure associated therewith are self-aligning. | ||||||
| 220 | Fluid level indicator | US659936 | 1976-02-20 | US4057700A | 1977-11-08 | Katsushi Nakashima |
| A fluid level indicator for a reservoir of a brake tandem master cylinder includes a pair of partition walls extending vertically upwardly from the bottom of the reservoir and thereby dividing the reservoir into three chambers. One chamber is in fluid communication with one brake circuit, another chamber is in fluid communication with the other brake circuit, and the third or middle chamber defined between the two partition walls is utilized for sensing and indicating the fluid level of brake oil within the reservoir. | ||||||
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