Abstract: This invention relates to apparatus for cleaning sewers or the like and more particularly to apparatus which is fast, thorough and otherwise effective in cleaning sewers and which is very inexpensive in construction and operation, requiring no supply of electrical, mechanical or fluid power thereto and requiring minimal effort and manpower for operation. The apparatus is readily controlled to obtain optimum performance under varying conditions, is highly reliable and is relatively light in weight and readily transported from one place to another.

Abstract: A keyboard system comprises a circuit board having a matrix of contact switches. A module comprises a matrix of keys in actuating correspondence with the contact switches. The keys are of a resilient elongated form having at the terminus an upwardly projecting contact button and a pair of downwardly projecting pegs. One peg contacts a contact switch for actuation thereof. The other peg is receivable in a recess in the circuit board for maintaining alignment of the key. The module also forms a support for an overlying membrane wherein manual depressing of selective locations of the membrane actuates a corresponding contact switch.

Abstract: A circuit breaker connector (100) for joining the ends of a pair of cables (10, 20) and passing an electrical signal therethrough, including a contact arrangement comprising an input contact (38) and an output contact (44) electrically connected to an internal switch contact (70) with the contacts cooperating to define a first electrical circuit path, and make-before-break switch means (72, 60) allowing insertion of an external circuit element (90) without interrupting the first circuit path for completing a second electrical circuit path including the circuit element (90) before breaking the first electrical circuit path.

Abstract: A microswitch comprises an insulating base, fixed contacts secured on the insulating base (1), a movable contact (4) adapted for selectively engaging the fixed contacts (2, 3) an actuating member (5), and means for shifting the movable contact (14) by the use of the actuating member (5). The means for shifting the movable contact (4) includes an actuating lever (6), an intermediate lever (7) a flat spring (8), and a contact lever (9) all connected in series with one another, the actuating and the contact levers (6and 9) being pivotally connected to the insulating base (1), the ends of the intermediate lever (7) and of the flat spring (8) being connected with one another a bearing up against a limit stop (17), and the contact lever (9) having a free end (12) whereon the movable contact (4) is located.

Abstract: A limit switch assembly which comprises a head having an actuator, a switch having a push button protruding outwards from a first area thereof and movable between projected and depressed positions, and also having at least two terminal members protruding outwards from a second area thereof for the electrical connection with external wiring elements, a rubber hood configured to substantially tightly receive the switch therein except for the second area of the switch, and having a circumferential flange formed integrally therewith so as to extend outwards therefrom in a plane generally parallel to the first area of the switch, and a switch box having an opening defined therein at a location confronting the head, and accommodating therein the switch together with the rubber hood. The circumferential flange is, when the switch is so accommodated in the switch box, positioned exteriorly of the switch box and surrounding the opening in the switch box.

Abstract: A printed circuit keyboard of the type comprising a face plate (10) having apertures through which keys (11) project, a resilient silicone rubber pad (12) having convex dimples (15) which engage the bases (14) of the keys, and a printed circuit board (13) having key pad contacts (16) which are bridged by the electrically conductive concave inner surface of a corresponding dimple when a key is depressed is improved by joining two or more keys together with a common base. When one key is depressed the others act as a hinge. This improves key pad contact since the hinge action causes the key to always come down the same way. This also improves the key "feel" since the hinge action will not allow the key to wobble on its descent. Embodiments of two, three and four keys joined with a common base are disclosed.

Abstract: A keyboard switch which is used in combination with a membrane switch array includes a housing adapted to be positioned on the membrane switch array. There is an upright opening in the housing and a plunger is reciprocal in the housing opening. There is a spring urging said plunger outwardly in said opening and there is an actuator lever pivotally mounted on said housing and positioned for engagement by said plunger. Inward movement of said plunger through a given distance causes the application of a switch closing force by said lever on the underlying switch array. The geometry of the actuator lever-plunger interface can be arranged for linear application of the switch closing force or sudden application of said force. Sudden application of the switch closing force provides a tactile feedback.

Abstract: The specification discloses an improved pressure cleaning system (10) which is adapted to facilitate complete purging of air and thus priming of the system in minimal time, and which incorporates all mechanical or electrical components constructed and arranged so as to be suitable for use in hazardous areas. The cleaning system (10) includes a float entry tank (20) connected via a U-shaped conduit (38) to a pump (42) located at substantially the same level as the tank. An electrical heater tank (88) is connected to the pump (42) and is located beneath the pump. A flow sensor (28) on the inlet to the float water tank (20) and temperature sensor (132) on the heater tank (88) are provided for sensing conditions which could lead to overheating and thus premature burnout of the heating elements in the heater tank. The controls are responsive to the flow sensor (28) and temperature sensor (132).

Abstract: A cleaning device to be used during dental surgery and dental treatments for cleaning, disinfecting and drying instruments, in particular turbine drills, comprising a box-container, including a vertical cylindrical chamber delimited by a tubular body, provided with an opening in the top wall of said container, body which is formed by three coaxial elements assembled to each other and which can be disassembled. The chamber is barred at the bottom by a removable grate which is designed to support the instrument during the cleaning operations, which are performed by means of jets of pressurized water and air fed through nozzles, while lower nozzles deliver pressurized air containing a nebulized disinfectant. The discharge of dirty water used for washing is carried on through the waste-pipe and is promoted by at least one jet of pressurized air, which creates a suction effect towards the bottom of the chamber and at the same time prevents drops from coming out through the opening.

Abstract: An electric switch having a pair of light bulbs located in tandem with one light bulb serving to light the outer peripheral edge of a control knob for indicating location of the switch in the dark and the other light bulb serving to light the control knob center for providing a system status.

Abstract: An apparatus for cleansing a stream of drilling fluid fouled drill cuttings having a housing divided into a plurality of compartments each designed to retain cleansing fluid. A spinning force is imparted into the incoming fouled drill cuttings in an inlet chamber wherein cleansing fluid is intimately mixed with the fouled drill cuttings. A decanting chamber removes liberated drilling fluid from the cuttings and disposes of such drilling fluid from the apparatus via a drain trough assembly. The underflow from the decanter is passed through a solids concentrating assembly wherein the coarse solids are deposited in a concentrating assembly bottoms chamber wherein the settled drill cuttings are removed from the apparatus. The overhead stream from the solids concentrating assembly is directed to a second decanter for removal of any remaining drilling fluid and fine drill cuttings entrained therein from the apparatus via the drain trough assembly.

Abstract: An electric switch including fixed and movable contacts, the movable contact being carried by a pivoted arm movable between a first position at which the fixed and movable contacts are in closed contacting relationship and a second position at which the fixed and movable contacts are in open noncontacting relationship, a control lever, a pivot mounting the control lever for movement between first and second positions thereof corresponding to the closed and opened positions respectively of the contacts, a toggle linkage including a plurality of links operatively interconnected between the arm and the control lever, a spring connected between the toggle linkage and the control lever for moving the arm from the first position thereof to the second position thereof and vice versa upon movement of the control lever respectively from the first to the second positions thereof and vice versa absent the contacts being welded together in the closed position thereof, the links being disposed generally in-line in the clo

Abstract: A vacuum contactor with a kick-out spring that does not require readjustment after disassembly of internal portions of the vacuum contactor. Two separate frame members are secured fixedly against each other in register in the operational mode. The bottom portion of a vertically disposed kick-out spring is attached to a horizontal bar which captures a lever. The lever is interconnected with an electromagnet and with the contacts of a vacuum interrupter in an integrated system so that energization of the electromagnet forces the contacts to a closed state and exerts tension against the spring through the horizontal bar. Deenergization of the electromagnet allows the kick-out spring to relax its tension thus opening the aforementioned contacts.

Abstract: An actuating fixture for use with a push-pull switch comprises a push-pull button through which a tightening screw extends axially, and a clamping tongs which can be closed by the screw. In its operational end position, the tongs grips an actuating head of the switch below an annular flange of the head. The push-pull button projects from a collar portion of a protective housing, and the collar portion and a casing of the switch bear external threadings which are both of the same type and diameter. The push-pull button is connected with the end of the protective housing facing toward the switch by means of an encasing hose of water-tight, flexible material. The actuating fixture has an internal threading which can be screwed on to the aforesaid external threading of the switch casing.

Abstract: A safety stop switch assembly (10) for controlling a device such as an outboard motor includes a toggle switch having a switch arm (12). A clip (16) is held in place around the switch arm (12) by a spring arm (21). The clip (16) can be attached to the operator by a lanyard (17). When the operator is sufficiently removed from the device, the lanyard (17) will pull the clip (16) away from the switch arm (12) and turn the switch off. The switch arm (12) can be used to control the outboard motor with or without the use of the clip (16).

Abstract: A device for cleaning an endoscope includes a communication member which is inserted into an air and water supply cylinder of the endoscope after removing a changeover piston from the cylinder. The communication member is movable between first and second positions and has a through-hole. Through the through-hole, the upper side portion of a water supply passage is communicated with the lower side portion of an air supply passage when the communication member is in the first position, and the upper side portion of the air supply passage is communicated with the lower side portion of the air supply passage when the communication member is in the second position.

Abstract: A pair of separate electrical switches are disclosed, each including a fixed contact supported by and electrically connected to a printed circuit board, and a movable contact comprising a deflectable portion of a strip of springy, conducting material. A single such strip is supported by and electrically connected to terminals of the circuit board in a central portion of the strip, the opposite end portions forming the movable switch contacts. A pair of push rods are carried by spaced, flexible, rubber boots which position the push rods and move them axially to urge the respective ends of the strip to a deflected position which moves one strip end away from the associated pin, opening a normally closed switch, and moves the other strip end to contact the pin, closing a normally open switch. The electrical and physical configuration of the switches is particularly suited to use as test and reset switches of a ground fault circuit interrupter device, in which context the invention is disclosed.

Abstract: A rectangular switch body has a plurality of terminals of round flexible wire rods and is provided at its four outer side surfaces with engagement members. Various kinds of cross-sectionally C-shaped brackets of a resilient metal plate provided with engagement members are prepared. An insert mount having a mount frame with at least three side walls engageable with at least three side surfaces of the switch body and engagement members is prepared. By using one of the brackets or the insert mount, the switch body is mounted on a printing wiring board in a desired direction or on a panel.

Abstract: A momentary contact rocker switch utilizes a pair of torsion springs as movable switch contacts, with fixed terminal posts being used as fixed contacts. The terminal posts are grooved in the region of contact with the torsion spring to provide a wiping action. This wiping action, along with the high electrical contact forces provided by the torsion spring, eliminates the need for silver contacts.

Abstract: An apparatus and method for measuring predetermined amounts of liquid additives, such as a detergent, acid, and/or a sanitizer which may then be automatically dispensed during a cleaning cycle of the dairy pipeline cleansing system. The apparatus includes metering chambers for each of the liquid additives which are connected by a supply line to respective bulk containers. A vacuum source is connected to the metering chambers through an intermediate trap chamber. A valve assembly is provided within each of the metering chambers to block off the vacuum source once the chambers are filled to the desired level. Valves are provided in each of the metering chambers for dumping the respective liquid additive into the cleaning system tank at a selected time.