Abstract: There is disclosed herein a liquid spray gun which includes an improved heat dissipation system and an improved leakage flow recirculating system.The improved heat dissipation system results from an improved and stronger air flow through the gun housing and around the electromagnetic coils. The improved air flow is created by a venturi or aspiration effect at the spray tip created by the action of the piston pump in spraying liquid at high velocity reducing the air pressure adjacent the tip. The internal portion of the housing communicates with the low pressure area so air in the housing is drawn from the housing to the low pressure area. Vents are provided in the housing adjacent the electromagnetic coils for outside air to be drawn into said housing over said coils and to the low pressure area, thus improving air flow and heat dissipation.

Abstract: The paint throughput quantity of a motor-driven throughput control valve of a paint spraygun is set such that first, a sequence of assignments between throughput quantity values and electric valve motor actuation signals is produced and input into a microcomputer as an approximation table. By selecting the desired value of throughput quantity, the microcomputer is then initialized to supply the tabularly-appertaining actuation signal to the valve motor as a control signal and to therefore approximately set the throughput control valve to the desired reference value. Finally, the throughput quantity is continuously measured during paint flow through the throughput valve and the measured values are supplied to the microcomputer as actual values, the microcomputer then supplying regulating signals to the valve motor on the basis of a comparision between the reference values and the actual values and therefore continuously readjusting the throughput control valve to the reference value.

Abstract: An airless spray gun includes a pump piston and a drive arrangement formed of a coil and a swinging armature for connection to an alternating current network. A suppression circuit is provided for periodically suppressing an arbitrarily selectable whole number of successive half-waves of the alternating current. A plurality of phase control circuits corresponding in number to the number of suppression stages is also provided, each of the phase control circuits effecting a phase-angle of fixed size and being permanently connected to one of the suppression stages to supply a phase-delayed signal of selected frequency to the drive arrangement.

Abstract: A pressure vessel for storing and delivering liquid under pressure which includes a housing, a removable cover on the housing, and a seal between the housing and the cover providing a liquid-tight and air-tight seal. Locking elements cooperate between the cover and the housing to provide a bayonet type lock therebetween. The vessel is provided with a manually unlockable excess pressure valve in the cover, the valve having a seating face arranged to be seated against a valve seat and the cover and a spring which urges the valve seating face into such seated relation. The structure is also provided for locking the valve seating face in unseated relation against the action of the spring means.

Abstract: A compact portable, easily operated, paint applying apparatus has a frame adapted to rest on the ground, a lifting handle on the frame for ease in carrying to use locations, a paint reservoir removably supported in upright position on the frame, an electric motor driven paint pump mounted on the frame above the reservoir, an intake tube depending from said pump into the reservoir, a discharge tube extending from the pump, and a paint applicator supplied by the discharge tube. The frame is preferably L-shaped with a bottom horizontal leg provided a sturdy base and an upright vertical leg. The horizontal leg has a well receiving the paint reservoir, the vertical leg has a recess receiving the rear end of a housing in which a reciprocal electric motor is mounted. The front end of the motor housing mounts a pump housing with a depending intake coupling directly over the paint reservoir on the horizontal base and an outlet coupling on the front end thereof.

Abstract: A reciprocating armature motor for electrically driving equipment such as a piston pump for a paint spray gun or a diaphragm compressor characterized by a stator having a solenoid, an armature pivotally mounted at one end to the stator and having a second end acting upon a member of the equipment to be actuated to move the member back and forth along a path when the armature moves relative to the stator with a reciprocating motion and an arrangement for controlling the reciprocating motor of the armature including a coupling link forming a positive link between the armature and a stationary element which coupling link moves depending on the reciprocating motion of the armature. In one embodiment, the coupling link is composed of a pair of pivotally connected arms forming an articulated link which interconnect the armature to the stationary element and coact with a stop to limit the movement of the armature toward the stator.

Abstract: An electrical feed and control circuit for a drive arrangement of the pump piston of a spray gun which comprises a coil and an oscillating armature, employs an input for connection to an alternating current network, an output leading to the oscillating armature coil, a half-wave suppression circuit optionally connectible by way of a transfer switch, a phase-angle control circuit connectible and disconnectible by the transfer switch in common with the half-wave suppression circuit, the phase-angle circuit including a timing element comprising a fixed resistor and a capacitor, and a second phase-angle circuit -having a timing element containing a variable resistor.

Abstract: An electrically-operated manual device, such as a nail driver, has an electric motor for actuating an axially-movable impact body. The motor is a vibrating armature AC motor having a single-sided movably arranged vibrating armature which, in dependence of the power supply frequency, acts with a high impact frequency on a low-mass impact body. The impact body is located in a stationary cylinder connected to a housing of the device and has a detachable adapter sleeve which receives a plunger activated via the impact body on a part to be driven. The configuration of the device makes it possible to construct a nail driver or the like with an extremely compact structure since the cylinder equipped with the impact body can be arranged immediately adjacent the vibrating armature AC motor. The power losses are negligible because the vibrating armature, swinging about an axis, acts directly on the low-mass impact body.

Abstract: A method and device for regulating diaphragm pumps during standby which reduces power input demands during non-delivery standby conditions while assuring a maintenance of working pressure upon a sudden change to a delivery condition which utilizes pressure of the drive fluid as a regulating variable by retaining a portion thereof outside of the drive chamber and using the pressure of the retained portion to control one or both of an intake aperture to the drive chamber or a pressure limiting outlet valve from the drive chamber.

Abstract: A hand held household or hobby type spray gun is provided with a pistol grip housing having a transverse bore receiving a removable piston pump and nozzle assembly, suspending a removable container for the medium to be sprayed, and covered by a removable cap enclosing an electric motor for driving the piston of the pump. The pump and nozzle assembly is locked in the bore by a quarter turn rotation which seats a detent in a recess of the bore. The electric motor is energized from an external power source through a cord carried by the cap or from batteries which may be mounted in a chamber provided by the grip or handle portion of the housing. The housing may be a one-piece injection mold plastics material member, and the removable container for the media to be sprayed as well as the closure gap for the motor may also be injection mold plastic material members. The grip or handle portion of the housing span the rear side of the spray gun and has a front recess embracing the container.

Abstract: A pressure peak compensator for compensating the pressures of a pulsating stream of liquid in a liquid pressure line comprises first and second opposed accumulator portions each having a pressure chamber which is connectable to the liquid line. Each accumulator includes a diaphragm extending across the pressure chamber which has a first side away from the pressure chamber which is disposed in a respective gas chamber and an opposite second side exposed to the liquid pressure in the pressure chamber. The diaphragms are movable between two end positions and in each end position the housing includes backing plates for backing the diaphragm along its contour in its end position. The respective gas chambers may be made of the same or different volumes and one or more of these chambers and diaphragms may be provided in each of the accumulator portions.