Abstract: This invention relates to an insert freely displaceable in a coil spring that at opposite ends abut against spring support formed in a motor compressor unit capsule and a spring support formed by a stator plate. The spring supports project into the opposite ends of the spring to extend toward one another. The opposite ends of the insert are recessed to be of shapes generally corresponding to the adjacent parts of the supports. The insert serves as a transport abutment and permits lateral movement without excessively deforming of the spring.

Abstract: An arrangement for mounting a motor blower assembly in a canister vacuum cleaner uses a pair of resilient rubber rings, one each on the front and rear of the assembly, to isolate the motor from the vacuum cleaner housing. The front ring goes over the front of the fan casing and is trapped within the housing, while the rear of the motor has attached thereto an adaptor which fits within the complementarily shaped rear rubber ring. This rear rubber ring in turn fits within a complementarily shaped motor support, which is attached to a support abutment within the housing. In order to accommodate different size motors within the same housing and utilize the same mounting components, the support abutment is pre-drilled at various locations to accommodate the different size motors. Thus, the only fixed attachment to the housing is the rear support, which is isolated from the motor blower assembly by the rear rubber ring.

Abstract: A fuel feed device having a first pump assembled with an electric motor in a sheet-metal shell to form a self-contained unit. The drive shaft of the motor projects from the unit and is drivingly connected to an impeller of a second pump whose housing surrounds the impeller. The housing of the second pump surrounds part of the self-contained unit and a sleeve is pushed over the self-contained unit with clearance therebetween and is connected at its lower end to the second pump housing and forms a seal with the self-contained unit by a holding ring and an elastic membrane. The device is easily adapted to casings of the first pump of any form and shape and to requirements, such as changes in filter size, mounting in the fuel tank, and for different types of second pumps.

Abstract: A vibration isolator particularly suited to isolating a closed cycle refrigerator in a cryopump includes two bellows covered with vibration damping material and separated by an intermediate mass. The damping material fills the spaces between corrugations of the bellows and is bonded to the bellows. A dynamic absorber operates to attenuate vibrations of a partucular frequency from being transmitted into the refrigerator from a drive unit of the cryopump.

Abstract: A pulsation preventive member for use with a pump constructed in the form of a hose disposed in a pump fluid passage. The hose is located in a fuel tank in such a manner that one end of the hose is connected with the pump and the other end of the hose is connected with a injector or the like. The hose is constructed so as to substantially inhibit pulsation by elastically deforming. The hose may have a substantially circular cross-sectional shape and a mesh-shaped thread layer incorporated therein. The mesh angle of the thread layer is preferably less than 50 degrees. Alternatively, the hose may have non-circular cross-sectional shape such as rectangular or elliptical cross-sectional shape. Further, the hose may be constructed so as to have a double-walled structure comprising an inner layer and an outer layer in the form of a hose with a plurality of connecting members interposed therebetween.

Abstract: A vibration isolator particularly suited to isolating a closed cycle refrigerator in a cryopump includes two bellows covered with vibration damping material and separated by an intermediate mass. The damping material fills the spaces between corrugations of the bellows and is bonded to the bellows.

Abstract: A portable floating apparatus for providing pressurized air to a submerged diver. The apparatus is comprised of the combination of a gasoline engine and an air compressor, said combination being housed in a buoyant container similar to a suitcase. The gasoline engine is preferably a two-stroke engine which drives the air compressor. The top of the container has large outlets for the intake of fresh air for compression, engine cooling and the exit of exhaust gases. These outlets have cowlings extending therefrom to reduce flooding by water from spraying or waves in rough seas. A small outlet on the side of the container with a coupling allows a flexible hose to supply air to a submerged diver. An optional fan may be inserted in the duct of one cowling to provide additional ventilation and cooling. The air supply hose, cowlings and other exterior components can be stored in the container when not in use.

Abstract: A closed type electric compressor includes a closed container and a compressor body elastically supported within the container. The body has a support frame supporting a compression section and an electric motor for driving the compression section. The support frame is formed with a pair of engaging holes facing the inner side surface of the container. A pair of stoppers are fixed to the inner side surface of the container and perpendicularly extend therefrom. Each stopper is loosely inserted into the corresponding engaging hole so as to engage the engaging hole to prevent excessive elastic deformation of the compressor body when the compressor receives large shock.

Abstract: A joint structure has a fuel supply pump disposed within a fuel tank in a vertical posture, and a fuel outlet pipe projecting from the upper end surface of the fuel supply pump. A cylindrical retaining member is fitted around the fuel outlet pipe and an O ring is also fitted around the fuel outlet pipe in contact with the upper end surface of the cylindrical retaining member. The inner surface of the O ring is in close contact with the outer surface of the outlet pipe. A cylindrical joint member penetrates the upper wall of the fuel tank and an upper opening of the joint member is connected to one end of a fuel supply pipe leading to an engine. The fuel outlet pipe is pressed into a lower opening of the joint member. At this time, the outer peripheral surface of the O ring retained by the cylindrical retaining member in contact therewith, comes in close contact with an inner surface of the joint member.

Abstract: A quick connect, disconnect adapter for a fuel pump outlet and a fuel line inlet in the form of a tubular flexible element with ends to slip over, respectively, a pump outlet nipple and fuel line conduit. A one-way duck-bill valve is molded integrally with the element to retain fuel in the fuel line when the pump is not operating. A coil spring embraces the element to confine the ends. A central portion of the element is expansible to absorb and modulate pump pulses and is confined against abnormal expansion by the coils of the spring. The coil can be slipped axially to release confinement of one end to allow ready removal from the pump outlet.

Abstract: An intake pipe (58) termimates at and is sealed to the outside of the casing of the unit. The outlet of this pipe into the casing is an orifice in the wall (120) of the casing. The intake opening of the motor-compressor is provided with a connector duct in the form of a separator-silencer body (56) which has an inlet aperture (86) facing the outlet orifice (124) of the intake pipe and which carries a suction cup (62) in the form of a cup of material that is resiliently deformable in an axial sense. The bottom of the suction cup (62) communicates with the interior of the intake duct (56) while the edge of the suction cup is pressed into resilient engagement with the inner surface of the wall (120) of the casing around the outlet orifice (124).

Abstract: Brake equipment for a hydraulic vehicle brake system which has an actuating assembly and a feed pump secured elastically thereon. The two communicate with one another via at least one suction and pressure line each. To assure an inexpensive, dependable flexible line connection between component parts that move relative to one another, the suction and pressure lines are embodied as housing bores in the assembly and pump housings and for a liquid-tight connection of two successive housings bores at a time extending in the course of the lines in the assembly housing on the one hand and in the pump housing on the other, at least one connecting tube is disposed in two flush bearing bores in the assembly housing and in the pump housing. The connecting tube rests pivotably and longitudinally displaceably in the bearing bores sealing off the bearing bores.

Abstract: An electric in-tank fuel pump for vehicles which is provided with a noise-reduction jacket of relative soft material spaced from the pump housing by internal projections on the jacket which contact the pump housing. An extended skirt on one embodiment serves to collect vapor which rises in the jacket to maintain a low liquid fuel level around the pump. A quick connect-disconnect from the pump to a fuel line with an integral unidirectional valve is provided to maintain fuel line pressure when the pump is not operating. Also, an inlet unidirectional valve is provided to prevent fuel from siphoning out of the pump.

Abstract: In an electromagnetic pump of the type including concentric outer and inner conduits for defining a passage for molten metal, an exciting coil surrounding the outer conduit, and a magnetic core contained in the inner conduit, a cartridge electric heater is inserted into the inner conduit for preventing temperature drop of the molten metal supplied to a casting machine, for example. The electric heater may be disposed in series with the magnetic core or may be inserted into a cylindrical magnetic core.

Abstract: A support of an intank pump at a pump support, which includes webs of elastic material that extend from the pump to the pump support in a direction deviating at an angle .alpha. from the radial which is determined by the longitudinal axis of the fuel pump. During swelling of the webs by the fuel, a rotary movement is thereby imparted to the pump without influencing the suction height. The webs may thereby have a relatively large volume as a result of which a good damping is achieved.

Abstract: The invention is directed to a ratchet or hold-down mechanism for a motor which is pivotally connected to a base of a compressor attached to an air receiving tank. The compressor is provided with a base having a pair of legs at one end which terminate at resilient pads resting on the tank. The motor is attached to the compressor base adjacent the legs for limited pivotal movement toward and away from the compressor. A ratchet or hold-down mechanism is provided between the motor and the compressor base to restrict pivotal movement of the motor toward the compressor while allowing the motor to pivot away from the compressor to increase the tension on a belt connected therebetween. The ratchet mechanism maintains tension on the belt in the event that the portable air compressor is picked up by the motor or is accidently tipped on its side. In addition, the ratchet mechanism maintains a minimum tension on the belt during operation of the motor.

Abstract: A vibration isolated cryogenic apparatus mounted as a mass in a series of mass/elastomer/mass springed system.

Abstract: A linear peristaltic device for pumping medical solutions to a patient comprises a hinged pivot or hinged attachment between the peristaltic drive mechanism and its associated platen. An IV tube, through which the medical solutions are to be pumped is received and held between the peristaltic drive mechanism and the platen during operation of the device. The device also includes a compliant means which normally urges the peristaltic mechanism toward the platen but which yields, as necessary, to limit the force the peristaltic mechanism can exert against the tube.

Abstract: A linear peristaltic device for pumping medical solutions to a patient comprises a hinged attachment between the peristaltic drive mechanism and its associated platen. An IV tube, through which the medical solutions are to be pumped is received and held between the peristaltic drive mechanism and the platen during operation of the device. The device also includes a compliant means which normally urges the peristaltic mechanism toward the platen but which yields, as necessary, to limit the force the peristaltic mechanism can exert against the tube.

Abstract: A combustion air blower assembly for a furnace includes a casing, a blower in said casing and a motor for driving said blower secured to said casing. This invention provides unique mounting means for securing the motor in close proximity to the casing, while allowing motor flexure in a direction radial to the axis of the motor to dissipate torsional vibration energy and maintaining the structural integrity of the motor in the axis thereof. The mounting means comprise a plurality of generally J-shaped isolation springs having a loop at each end. One loop of each isolation spring is secured to the casing and the other loop is secured to a bracket on the motor. Each isolation spring is generally flat and extends generally perpendicular from the wall of the casing to which the motor is secured.

Abstract: A compact, balanced and lightweight air compressor unit for a railroad vehicle which includes a motor-driven compressor, a suction strainer and suction silencer. The compressor and motor are interconnected by an intermediate hollow flanged mounting member which has a cross-sectional dimension that is smaller than the cross-sectional dimension of the motor and compressor. The suction strainer is located in a space between the motor and compressor and is attached to one side of the intermediate hollow mounting member while the suction silencer is located in a space between the motor and compressor and is attached to the other side of the intermediate hollow mounting member to form a substantially balanced structure which is suspended to the underside of the floor of the railroad vehicle by a plurality of resilient bumper connectors.

Abstract: A fuel sender unit is provided for delivering fuel from a conventional fuel tank that may have a resilient bottom wall of the type that deflects under a fuel load. The fuel sender unit includes a support fixture mounted on the fuel tank, a sending unit within the fuel tank for pumping fuel in the fuel tank toward a point of use outside the fuel tank, and an extension apparatus for coupling the sending means to the support fixture for relative movement therebetween. The extension apparatus includes a plurality of fluid-conducting telescoping guide tube assemblies. The sending unit includes a pump and a reservoir cup for accumulating an auxiliary supply of fuel within the fuel tank to maintain a substantially uninterrupted supply of fuel to the pump. The sending unit is lowerable to a variety of depths within the fuel tank to reach and pump fuel accumulating in various regions along the bottom fuel tank wall notwithstanding sagging deformation of said bottom wall.

Abstract: A wet motor gerotor fuel pump for pumping fuel from a fuel source to an internal combustion engine. The fuel pump includes a pump case having an inlet chamber, a motor chamber, and a pump chamber therebetween. An inlet housing provides appropriate fuel inlet to a gerotor pump in the pump chamber. An outlet housing receives the pressurized fuel and delivers the fuel to the internal combustion engine. An electric motor mounted in the motor chamber is adapted to pass the fuel therethrough such that the fuel is pumped substantially through the gerotor pump along a flow axis through the complete pump assembly to the internal combustion engine.

Abstract: A submersible fuel pump and fuel sender assembly for a vehicular fuel supply system, supported within an opening in a fuel tank and located inside the tank by a plastic bumper seated in a recess in a tank wall.

Abstract: A mounting assembly for an electric motor includes a plurality of mounting arms, each having a first portion extending in a generally radial direction with respect to a central axis of an associated electric motor and a base portion extending longitudinally in a direction parallel to the central axis. One end of the base portion is rigidly attached to the motor, and a tab on a second end of the base portion is inserted into a tab receptacle. The position along the mounting arm base to which the radially extending portion is attached can be varied in order to control the motor location in an axial direction.

Abstract: A vacuum cleaner having improved structure for mounting the motor-fan assembly to a mounting plate and resilient motor mount ring. Bosses are provided on the housing whereby screws utilized for securing the mounting structure to the bosses are readily accessible. Further, the bosses provide air circulation under the motor-fan assembly for improved air-cooled operation thereof.

Abstract: In a rotary hermetic compressor an improved bearing is provided which is attached to the housing of the compressor at three points located circumferentially equidistantly spaced around the bearing. The compressor cylinder is secured to the bearing. The bearing is held in compression against the housing whereby the housing acts as a spring so that variations in the outside diameter of the bearing can be accommodated by the spring action of the housing.

Abstract: An elastomeric, sound and vibration damping fastener element (16) for fan motors and the like, adapted to fit between two spaced, parallel mounting flanges or plates (4,6) and comprising a brace body (18) extending between the flanges and connected thereto by buttons (20) which extend into holes in the flanges, a strip (28) which overlies the peripheral edges of the flanges at a corner, and one or more radial arms (24,26) which connect the brace to the strip.

Abstract: Improved mounting structure for mounting a motor and fan unit to a housing support of a vacuum cleaner for preventing transmission of vibrations and sound from the motor and fan unit to the housing in the operation of the vacuum cleaner. The mounting structure includes a resilient mounting ring arranged to be under compression and bending in supporting the motor-fan unit to the housing support wall. A rigid ring is carried on a resilient ring and, in turn, carries the motor-fan unit so that forces generated by the motor-fan unit must pass through a space between the motor-fan unit and the circumjacent support wall. The resilient ring is clamped to the upper end of the support wall by presser elements engaging lugs on the resilient ring extending upwardly through suitable openings in the overlying rigid wall. The resilient ring further defines a resilient support for a pressure switch.

Abstract: An electric motor driven fuel pump is mounted in a fuel tank with noise isolators to decouple the fuel pump and the fuel lines from the fuel tank and the vehicle body structure. The fuel discharge line is isolated from the pump discharge passage by an elastomeric connector, and both the fuel discharge and fuel return lines are isolated from the fuel tank by resilient elastomeric grommets. A reaction mass is connected to the discharge line and the return line and isolated from the fuel tank. The reaction mass provides a significant change in the mechanical impedance of the system and thereby absorbs a majority of the fuel pump vibratory energy.

Abstract: A hermetic refrigeration compressor system comprises a sealed shell containing two motor-compressor units of different capacities and also containing a suction gas accumulator through and from which suction gas is delivered to both units, the interior of the shell being at suction pressure; gas from an outlet of the accumulator being directed into an aligned, spaced inlet in the motor cover of the smaller unit. Both units are spring-mounted on a unitary support within the shell.

Abstract: A fuel tank mount for in-tank electric fuel pumps to reduce noise and vibration which includes a sealed outer shell spaced from the elongate housing of the fuel pump and supported in and isolated from the pump by resilient seals. The fuel pump and surrounding shell are supported on a fuel tank top closure. One modification utilizes a wire support. A second modification utilizes a direct mount to the top closure. A vapor by-pass is disclosed for one embodiment which closes in response to liquid fuel under pressure.

Abstract: A closed type compressor comprises a case, a frame provided within the case, and a compressor and an electric motor, both of which are attached to the frame. The frame is constituted by an elongated sheet material member and a plurality of embossed portions integrally formed at the positions of the sheet material member capable of being seen by the eye both from above and from below and used to mount thereon the compression means and the motor means, respectively. The sheet material member is comprised of a central portion, leg portions formed by bending end portions of the sheet material member substantially perpendicular thereto, and ends formed by bending tip ends of the leg portions substantially perpendicular thereto so as to face the central portion.

Abstract: A casing of a blower of the improved construction easy to assemble and low in noise level, and a ventilating fan utilizing such casing. The casing of the blower includes a frame, and spiral cases arranged in the frame and having suitable elasticity with respect to the frame, the spiral cases having external dimensions slightly larger than the internal dimensions of the frame in natural condition, so that the spiral cases can be securedly held in place in the frame by the elasticity of the spiral cases themselves.

Abstract: A floating portable pump is constructed of a float defining a well for containing water, a centrifugal pump supported on the float with its impeller shaft extending vertically and with its suction inlet submerged in water in the well, and an internal combustion engine arranged to drive the pump impeller. The pump and engine are secured together on the float in an arrangement such that the engine causes rotation of the pump impeller to cause the pump to draw water from the well through its suction inlet and discharge water from the pump discharge.

Abstract: A suspension system for hermetic motor-compressors in which a motor-compressor unit is located in a casing formed by two superimposed cup-shaped bodies connected together in a frontal mating position. The motor-compressor unit has at least three radial support arms, each with an aperture at its free end which is oriented in an axial direction relative to the casing. Tubular support brackets are fixed to the side wall of that cup-shaped body acting as the lower portion of the casing in positions corresponding to the free ends of the said arms, each of the brackets carrying within it a bush of plastics material with a cavity which is aligned axially with the aperture of the overlying support arm. The bushes house resilient suspension elements, each of which is lodged at its upper end in the aperture of one of the support arms.

Abstract: A refrigerant compressor (10) including a compression mechanism (18) resiliently supported within a sealed outer casing (12) is provided with means for maintaining the air gap between the rotor (40) and stator (42) of the electric drive motor (20) for the compression mechanism. The rotor is secured to a drive shaft or crankshaft (26) journaled in the compression mechanism. The stator is bolted to the compression mechanism. The means for maintaining the air gap comprises a plurality of balls made from a relatively hard material, which are indented into the relatively softer material of the stator and of the compressor body during assembly of the stator to the compressor body. The stator is fixed relative to the compressor body and to the rotor journaled in the compressor body, thus maintaining the air gap between the stator and the rotor during shipping and handling.

Abstract: A submersible pump system comprises a lowermost electrically driven pump unit (4,55) providing an inlet to the system for liquid to be pumped and one or more like pumps (5,55) positioned above it and connected in series. Electric power is supplied to the units by way of conductors within a central pipe (14) concentric with an outer cofferdam pipe (12), dielectric oil being circulated through the conductor pipe and between it and the cofferdam pipe and thus through the pump unit motors which have hollow drive shafts (21) around the conductor pipe. The pump stack may be located within a well casing (52), by sealing rings (62) expanded by the dielectric oil pressure, or surrounded by an outer load-bearing pipe (10). The liquid pumped flows externally of the pump stack and the system can be constructed in separate lengths which can be readily assembled on installation.

Abstract: A multistage resonant reciprocating compressor having opposed cylinders that are driven by a plunger unit. The plunger unit is suspended between a pair of spaced apart flexure springs and is electrically coupled to a linear motor mounted between the springs. The forces acting on the cylinder piston located on one side of the plunger unit are balanced against the piston forces acting on the other side of the unit and the stiffness of the flexure springs arranged so that the natural frequency of the plunger is at or near the exciting frequency of the motor.

Abstract: A sealed type motor compressor includes a motor section, a compressor section, a sealed enclosure for resiliently supporting therein the motor section and the compressor section, a suction pipe extending through the sealed enclosure, a suction muffler mounted on the compressor section, an insert pipe received at its one end in an inlet port with a slight clearance therebetween, and a closely coiled spring in the form of a cylinder for interposing between the suction pipe and the insert pipe. A communication pipe is adapted to extend through an aperture formed in the muffler and to be forcedly fitted into a suction port formed in a cylinder head, thereby serving to connect the muffler to the cylinder head.

Abstract: In a compressor assembly, the motor compressor unit is vertically supported by lower bearing head which receives the crankshaft of the compressor. The lower bearing head is vertically supported by a positioning plate which is in turn vertically supported by a spring which is received in a recess in the casing. The mounting structure comprising the head, the plate and the spring coact to provide the sole vertical support of the motor compressor unit. This single vertical support is stable because the center of gravity of the compressor is coaxial with the centerline of the spring. The position plate may be rotated to accommodate compressors having different centers of gravity.

Abstract: A hermetic motor compressor including a closed housing which covers motor and compressor means; and a partition wall which separates a lower temperature compartment in which at least part of a motor is held and a recycling coolant is fed through an inlet port formed on said housing; and a higher temperature compartment in which a compressor and a coolant muffler and a loop part of an outlet pipe are held.

Abstract: In a dredge pump having a pump housing and an impeller in the housing, an impeller shaft projects through and beyond the housing in both directions. Two drive motors, one coupled rigidly to one end of the shaft and the other, to the other end, to drive the shaft, hence the impeller, are mounted on supports. The supports are mounted on pads made up of a pair of plates with an elastomeric block sandwiched between and bonded to them, by being connected to one of the plates of each pad. The other of the pad plates is mounted or secured to a fixed structure located with respect to the pads and impeller so that axial forces from the impeller shaft tending to put one set of pads in tension are countered by axial forces tending to put the other set of pads in compression. The pads permit substantial torsional movement, and provide compensation for slight misalignment of the drive motors, permitting the rigid coupling of the drive motors to the two ends of the impeller shaft.

Abstract: A motor-driven compressor particularly for a refrigerator has a cylinder-and-piston unit whose piston is driven from a shaft of a rotor of an electric motor, two sound-damping chambers communicating with a cylinder of the cylinder-and-piston unit, and a bearing element mounted on a stator of the electric motor and having a portion forming a main bearing for the shaft of the rotor, a relatively small bridge-like portion overlapping only a part of a winding of the electric motor, and two legs located diametrically opposite one another and mounted on the stator of the electric motor. The sound-damping chambers may be of one piece with a cover of the cylinder and the latter may be a separate member without the cover.

Abstract: There is disclosed herein a suspension system including a shipping stop arrangement for resiliently mounting a refrigeration motor-compressor unit within a hermetically sealed shell. The suspension system comprises a three point supporting arrangement employing a pair of laterally disposed springs, each having a single tapered portion, for providing vertical support to the motor-compressor, in combination with a single top spring for providing lateral stability. Lateral and vertical motion limiting shipping stops are also provided to prevent excessive movement of the motor-compressor, such as may occur during shipment thereof, from damaging the suspension system members. In addition, the system is capable of accommodating different size motor-compressor units in a standardized hermetic shell size by using simple spacers of different sizes.

Abstract: In order to use a common module cryogenic cooler with two different types thermal nights, an adapter plate is required for mounting the cooler to the sights. The plate has its two opposite sides differently machined to fit against the walls of corresponding sights, and has a central opening for a cooler mounting flange. For one sight, one side of the adapter is screwed to the sight wall and the cooler flange is inserted in the central opening. For the other sight, the other side of the adapter is inserted into a recess in the sight wall, and is retained by a retainer plate screwed to the wall. The cooler flange is inserted into the adapter plate central opening through a hole in the retainer plate.

Abstract: A motor-compressor unit comprising a compressor, a shell enclosing the compressor, and a suspension system resiliently suspending the compressor within the shell. According to a first aspect of the invention, the shell includes first and second sections joined together along a seam defining a vertical plane, and the suspension system includes a mounting plate and a resilient member. The mounting plate is supported by the shell; and the resilient member is supported by and spaced from the shell seam by the mounting plate, and extends between the mounting plate and the compressor to support the compressor resiliently within the shell. According to a second aspect of the invention, the shell and compressor define a plenum; and the suspension system includes a resilient member located in this plenum, extending between the shell and the compressor, and applying a resilient force to the compressor along a cylinder axis thereof to dampen movement of the compressor along the cylinder axis.

Abstract: The invention relates to a small, efficient hermetic compressor for refrigeration wherein reduction in size and minimization of parts is emphasized. The motor compressor unit is mounted within a sealed outer housing and comprises a cast crankcase, which is connected to the stator of the electrical motor by means of only three connecting screws that extend through the stator and are threadedly received in sockets in the downwardly depending legs of the crankcase. The crankshaft is pressed into the motor rotor and is journaled within the crankcase for rotation about a vertical axis. The crankcase includes a slot extending into the cylinder so that the connecting rod can be inserted laterally into the cylinder at the same time that it is slipped over the end of the crankshaft, and the wrist pin is then inserted through the same slot, through the piston and connecting rod, and is held in place by a spring clip.

Abstract: The invention relates to a small, efficient hermetic compressor for refrigeration wherein reduction in size and minimization of parts is emphasized. The motor compressor unit is mounted within a sealed outer housing and comprises a cast crankcase, which is connected to the stator of the electrical motor by means of only three connecting screws that extend through the stator and are threadedly received in sockets in the downwardly depending legs of the crankcase. The crankshaft is pressed into the motor rotor and is journaled within the crankcase for rotation about a vertical axis. The crankcase includes a slot extending into the cylinder so that the connecting rod can be inserted laterally into the cylinder at the same time that it is slipped over the end of the crankshaft, and the wrist pin is then inserted through the same slot, through the piston and connecting rod, and is held in place by a spring clip.

Abstract: An electromagnetic fluid pump comprising an electromagnet motor unit for producing a magnetic field of reversing polarity to drive a fluid pump unit to pump fluid such as air. The fluid pump unit comprises a generally cup-shaped pump casing having its open end closed by a flexible diaphragm to define a fluid pumping chamber. A permanent magnet is mounted on the diaphragm, and the pump unit is mounted directly on the electromagnet motor unit with the permanent magnet and the electromagnet motor unit positioned at opposite ends of the fluid pumping chamber. In operation, the reversing magnetic field alternately repels and attracts the permanent magnet to displace the diaphragm to expand and contract the volume of the fluid pumping chamber. Expansion of the fluid pumping chamber draws fluid into the chamber through an inlet port including a one-way valve, and contraction of the fluid pumping chamber expels the fluid from the chamber through an outlet port including a one-way valve.