Abstract: An aerial device includes a boom support structure, a boom pivotally secured to the support structure, and first and second boom lift hydraulic actuators. The first and second boom lift hydraulic actuators are operated in tandem to raise, lower, and hold the boom in position. The first and second boom lift hydraulic actuators are pivotally connected between the boom support structure and the boom and are disposed with respect to the boom pivot axis so that regardless of boom position, one of the first and second actuators is under tension and the other is under compression. This eliminates the danger of loss of lift of the boom caused by end gland failure of a lift actuator.

Abstract: A dryer for automated washing and drying of mesh or perforated bottom trays such as those used for bakery goods, which includes a source of air under relatively low pressure and has a means to direct air at a relatively high velocity through the mesh or open bottom tray as it is carried on a perforated or open conveyor, and vacuum means connected to the suction side of the same fan to collect and receive moisture laden air and water droplets that pass through the tray and the conveyor. The fan includes a water-air separator on the inlet side so that the inlet air carrying the water is processed to remove water droplets and the like.

Abstract: A vortex flowmeter having a flow obstruction body or vortex forming bar formed in a manner to provide enhanced generation of vortices across a wide range of Reynolds numbers of the fluid being measured. The bar includes projections adjacent the lateral edges thereof which tend to cause formation of vortices at the leading lateral edges with respect to the direction of flow and enhance the formation of such vortices along the surfaces extending generally parallel to the flow. Additionally, the flowmeter disclosed provides a mounting for a sensor which makes the device relatively insensitive to acceleration in the mounting structure or supporting pipe of the flowmeter.

Abstract: A sampling catheter having an outer tube of resilient material with a normally closed distal end and an inner flexible tube which is longer than the outer tube and which is normally held in retracted position with respect to the distal end of the outer tube by means of a loop of the inner tube which is fastened to the outer tube. The assembled catheter is disposed in a sealed package with the inner tube in such retracted position.

Abstract: A dirty filter indicator for use with an air filter for an internal combustion engine, the filter comprising a replacement for an ordinary wingnut used to hold the outer cover of the air cleaner in position. The replacement nut has a bypass passage through it which communicates with the interior of the filter so that if the filter becomes dirty and clogged, a lightweight ball which is located in this passage and is normally biased to one position moves to a second position to indicate that the filter is dirty.

Abstract: An antenna mount for an antenna, such as the antenna of a citizen band (CB) radio, is adapted to be rapidly clamped to an outwardly extending member such as a rear view mirror support bar of a truck. The mount includes first and second metal plates having clamping portions for holding the support bar therebetween. The first and second plates are connected together at one end by a hinge, and the clamping screw is used for clamping the first and second plates together. The antenna and an antenna connection cable are connected together at a receiving portion or aperture of the first plate so that the ground conductor of the cable is in electrical contact with the first plate. An electrically conductive member is connected to one of the plates and engages the support bar when the plates are clamped together.

Abstract: The present invention is a strip feed control which is particularly useful in photographic systems such as film and paper cutters, film notchers, and printers. The photographic strip material is fed by a predetermined feed length during each operating cycle. The operator of the system visually monitors the position of the strip with respect to a reference position or indicator along the feed path and provides adjustment signal through an operator control knob. The strip position is moved in accordance with the desired adjustments, and the predetermined feed length for the next operating cycle is derived from the predetermined feed length of the just completed operating cycle, together with any adjustment in the strip position which was made by the operator.

Abstract: A positive temperature coefficient (PTC) resistance heater assembly is used in combination with an angle of attack vane to provide automatic means for maintaining the temperature of the vane at a level which will de-ice the vane. The heater assembly is embedded in a recess in the vane and is made up of a plurality of individual PTC resistors connected electrically and mechanically in parallel by flexible electrically conductive perforated strips which permit the individual resistors to move relative to each the other under thermal stress and which also permit the encapsulation of the resistors in a suitable thermally conductive, electrically oinsulative material that is sufficiently resilient to permit the individual resistors to expand and contract relative to the vane during use.

Abstract: A solar collector having a housing and a plurality of substantially parallel heat absorbing vanes mounted in the housing immediately beneath a radiation transparent upper wall in such a manner as to form a plurality of relatively narrow channels through which a heat exchange fluid is circulated. The width of the channels is preferably not greater than one-half of the depth of the channels and is preferably substantially less. The width of the channels may be as little as one-sixth of the depth of the channels. Provision is made for changing the angular disposition of the vanes and this may be done by heat sensitive means sensitive to the direction of the solar radiation. One form of the vane is L-shaped in cross section with a short leg of each L constituting the bottom wall of the channel and the long leg constituting a side wall of the channel.

Abstract: A controller for controlling SCR's used for supplying power to loads, which provides digital control of the phase angle of the firing signal for SCR's during rapidly changing frequency of applied power. The digital control is based upon clocking signals which are derived directly from the rotation of a generator to always provide a set number of pulses for each electrical cycle independent of time (frequency).

Abstract: A depth control for grain drills, planters or the like utilizing a press wheel which can be adjusted to control the depth of each individual furrow opener to insure uniform depth of planting across the width of wide machines presently in use.

Abstract: Imprinters or stampers for imprinting or stamping numerals, letters or symbols into the top of pieces of dough prior to baking, which includes means for individually sensing each piece of dough to insure that the imprinting device is properly timed for imprinting the dough pieces.

Abstract: A rear view mirror for vehicles such as automobiles and trucks, which provides a periscope-like rear view utilizing only two mirror surfaces. One of the mirrors is a substantially planar mirror, and the second of the mirrors is a curved part elliptical mirror. At least one of the mirrors is mounted outside the windshield, and the use of the part elliptical mirror surface provides the proper orientation of the image that is seen by a driver without utilizing prisms, lenses, or three mirror systems. The device is thus much more compact, more attractive in use, and still affords a substantially undistorted wide angle view to the rear.