Abstract: A measuring head has a base and extending spaced apart vertical sidewalls that form a slot into which a tube through which a fluid flows is placed and at least one sensor element mounted in at least one of the sidewalls to detect a characteristic of the flowing fluid. At least one through passage is formed in each of the sidewalls that are aligned opposing each other to form a pair of passages through which a strap is passed above the tube in the head slot and a fastener holds the strap bound to the sidewalls to retain the tube in the slot. One embodiment has a pair of the sidewall slots on each side of a sensor element mounted in a sidewall. A passage also can be provided in the head base through which a strap can pass and then be passed through a pair of the sidewall passages.

Abstract: A jig for cutting plugs for pocket holes from a workpiece has a base leg, from which transversely extend guide and clamp legs. One or more guide channels extend through the guide leg at an angle to an interior face of the guide leg to guide the sleeve of a rotating cutter bit that has a cutting edge at its end and a removed section forming a cutting blade. A clamp extends from the clamp leg to engage one face of a workpiece whose end is mounted on a raised ledge on the base leg and holds the workpiece opposing face against the guide leg interior surface as the sleeve end cutting edge and blade advances into and cuts entirely through the workpiece to cut the plug. A collar on the cutting bit shaft engages the guide leg to prevent the sleeve end cutting edge from contacting the base leg. The jig also can be used for making pocket holes by using the appropriate drill bit.

Abstract: An ultrasonic sensor for measuring the level of liquid in a vessel has an elongated tubular probe, a tube within the probe, and a transducer that converts electrical energy to ultrasonic energy mounted at or near one end of the tube so as to transmit ultrasonic energy horizontally across the probe. An element having a surface that reflects ultrasonic energy is at an angle, preferably of about 45°, to the probe longitudinal axis opposite to an ultrasonic energy emitting part of the transducer to reflect ultrasonic energy received from the transducer upwardly in the probe to an air-liquid interface from which it is downwardly reflected to the angled reflector element that directs the energy reflected from the interface back to the transducer for conversion to an electrical signal that is used by an electronic module to measure the liquid level in the probe which is the liquid level in the vessel.

Abstract: A combination mortise and tenon jig has a body including a platform having an open section with first and second clamp legs on opposite sides for holding a workpiece therebetween with the workpiece part in which a mortise or tenon is to be cut facing toward the open section. A plurality of adjustable members extend from the first clamp leg to engage a workpiece face and the second clamp leg is movable relative to the open section with the extending members and the second clamp leg holding the workpiece at a selected position in the open section. A pair of guide arms pivotally mounted below the platform swing across the platform open section to engage the workpiece part and make it parallel to the platform and a template having a cutout pattern of one of a mortise or tenon overlies the platform open section to guide a router bit to cut the mortise or tenon in the workpiece end.

Abstract: A method and apparatus for measuring the sound velocity of a flowing fluid includes a cartridge having a hollow interior through which the fluid flows formed by first and second chambers of different diameters that define first and second walls extending toward the cartridge longitudinal axis from which energy transmitted by a single sensor mounted in the cartridge is reflected back to the sensor. An electronic circuit includes a microprocessor that is programmed with the distance between the first and second walls and that measures the round-trip transit time of the signal energy transmitted to and reflected from each of the first and second walls and calculates the sound velocity of flowing fluid using the two measured round trip transit times and the programmed value of the fixed distance between the walls.

Abstract: A system and method for measuring the flow rate of a liquid in a tube non-invasively has a heating element that generates energy that is applied to the liquid to produce a heat marker that is detected by a temperature sensor located at a known distance from the heating element and the flow rate is calculated from measuring the travel time of the heat marker from the heating element to the sensor. A second temperature sensor measures the ambient temperature of the liquid before the heat marker is produced and detection of the heat marker is made on the basis of the difference between the ambient temperatures and the temperature of the heat marker.

Abstract: A jig to make the pin and tail parts of a dovetail joint in first and second workpieces has a frame with front, bottom, and top walls. A plurality of spaced rails form first guide slots in a first section of the frame front and top walls and a plurality of posts form second guide slots in a second section of the front wall. Fasteners on the frame bottom wall clamp the jig to one face of the first workpiece with an end facing the plurality of first guide slots and clamp the jig to one face of the second workpiece with the second plurality of guide slots facing the plurality of second guide slots. The guide slots guide a router cutter bit when in each of the first and second slots to cut into respective first and second workpieces ends to make the joint pin and tail parts.

Abstract: A non-invasive dry coupled disposable/reusable ultrasonic sensor has a housing and a piezoelectric element at one end of the housing to which connected signal leads are connected that extend out from the housing. A piece of double-sided adhesive tape has one adhesive side secured directly to the face at the one end of the housing with the other adhesive side to be secured directly to the outer surface of a pipe or vessel. The tape can cover the entire face of the one end of the housing or only that part that the piezoelectric element faces.

Abstract: Apparatus for measuring the level of liquid in a container has a substrate on which a plurality of piezoelectric elements are mounted that are to transmit ultrasonic energy upwardly through the bottom of a container placed on and supported by the substrate into the container and to receive ultrasonic energy reflected back from the liquid/air interface within the container from which the round trip time can be measured and the liquid level calculated. The plurality of piezoelectric elements are of predetermined shapes and mounted spaced apart on the substrate in an array to accommodate containers with different shape bottoms.

Abstract: An integrated multi-function sensor system has a head having a slot to accept a tube of a deformable material and a plurality of sensor elements mounted in the walls of the head slot to confront a tube in the slot, each sensor element being for affecting sensing of a condition relating to a liquid in the tube. An integrated electronic circuit including a microprocessor operates to determine the various conditions of a liquid flowing in the tube sensed by the sensor elements, which conditions include detection of air bubbles and/or particles by ultrasonic sensing elements, detection of an occlusion in the liquid flow by sensing the deformation of the tube wall by a force sensing element, determining the temperature of the liquid by an infrared temperature sensing element, and determining the color of the liquid by optical elements.

Abstract: A system using ultrasonic energy for detecting and quantifying air bubbles and/or particles in a liquid flowing in a tube by a non-invasive and non-destructive technique has an ultrasonic sensor having piezoelectric transmitter and receiver elements placed opposing on the outside of the tube wall and energy in the ultrasonic frequency range is transmitted from the transmitter element to the receiver element. The received ultrasonic energy is amplified and detected and preferably split into a steady state (DC) component and a varying or transient (AC) component respectively indicative of the absence and the presence of an air bubble or a particle in the liquid. The two components of the signal are applied to an A/D converter whose output is supplied to a microprocessor which uses the digital data that corresponds to the presence of the varying transient component to indicate the presence of an air bubble and/or a particle and to measure its characteristics.

Abstract: A system for determining pressure change in a liquid flowing in a tube of an elastic material has a sensor head having a slot and a pair of piezoelectric elements mounted in opposing walls of said slot between which the tube is placed in contact with the opposing elements. An electronic circuit generates periodic bursts of electro-mechanical energy from one of the elements that is transmitted through the tube to be received by the other element to be converted to an electrical signal from which is measured the travel time value of the energy through the tube and liquid therein and the amplitude value of the received signal which values are compared to at least one of base line travel time and amplitude values to determine a change of pressure of the liquid flowing in the tube.

Abstract: A fixture for drilling a pocket hole in a working face of workpieces of different thicknesses is a U-shaped member having a guide leg and a clamp leg parallel to each other and joined together at a bottom end of each by a transverse base leg. An angled guide channel is in the guide leg that has an entrance for a drill bit on an exterior part of the guide leg and an exit on an interior face which opposes the workpiece working face. A plurality of horizontal elongated ribs are spaced vertically apart on the guide leg interior below the guide channel exit and there is a shelf having a face on which a second face of the workpiece that is transverse to the working face is to rest and that has an edge with a plurality of horizontal vertically spaced ribs to inter-engage with the ribs on said guide leg. A screw extends outwardly from the shelf to extend through a slot in the guide leg and a nut fastens the screw against the guide leg to hold opposing ribs of the guide leg and shelf inter-engaged.

Abstract: A fixture for lamps used for portable and temporary applications has an elongated rail with a central channel, preferably with holes spaced along the channel bottom wall. Adapter bases are fit and fixed to the rail to support various types of light sources. In the case of a fluorescent lamp, each adapter base has one or more spring clamps into which a fluorescent lamp tube can be snapped and for other types of light sources the appropriate types of sockets and/or clamps, brackets or supports are provided. A wiring harness can be attached to the rail and secured by clips, clamps or holders attached to adapter bases along the rail. The rail with its attached light source or sources preferably has a flat back so that it can be mounted either permanently or temporarily to a flat surface by suitable fasteners or suspended from a ceiling or other elevated structure by a suitable tether.

Abstract: A screw-plastic part unit in which the plastic part can be a guide having a tapered bottom end for fitting into a countersink to center the tip end of the screw in the countersink and also can have at least one cut-out portion at its top end to facilitate fracturing of the guide as the screw is threaded into a base member. In one embodiment the screw has a thread between its head and tip end which extends to near the tip end leaving a clear area between the thread end tip end and the part of plastic material molded around the screw clear area in which there can be a circumferential groove or rib into or over which the plastic part is molded to better hold the part to the screw. In another embodiment fins extend into the part hole to hold the screw by an interference type fit.

Abstract: A fixture for drilling pocket holes in workpieces of different thicknesses is formed of a U-shaped member having parallel guide and clamp legs and joined by a transverse base leg. One or more guide channels are formed in the guide leg at an angle to the guide leg that has an external entrance for a drill bit and an exit on the guide leg interior opposite a first surface of the workpiece in which a hole is to be drilled. There is a floor on which a second surface, the narrow edge, of the workpiece that is transverse to the workpiece first surface is to rest that is vertically adjustable relative to the guide channel exit, and an adjustable screw clamp threaded in the clamp leg to engage a third surface of the workpiece opposite the workpiece first surface to hold the workpiece first surface against the interior surface of said guide leg during the time a drill bit is advanced in the guide channel to the workpiece first surface.

Abstract: An ultrasonic instrument includes generator of ultrasonic energy; a connecting body that receives ultrasonic energy from the generator and having an end from which the energy exits and a coupler at such end exterior of the connecting body having an inlet aspiration flow passage for receiving aspiration flow force from a source. A work tip has its proximal end connected to the coupler to receive the generated ultrasonic energy and a distal end from which the ultrasonic energy is supplied to the operating site to emulsify material. The work tip has an aspiration passage that is in communication with an aspiration passage in the coupler that communicates with the inlet passage and at least one of the work tip is detachable from the coupler and coupler detachable from the connecting body.

Abstract: A clamp to make a straight edge on a working board has a base with a lower surface to slide on a table saw and a main wall that extends upward from the base. A lower support extends outwardly from the main wall in opposite directions, and two upper supports extend outwardly from the main wall in opposite directions to define channels, wherein a reference board is placed in one channel and the working board in the other channel. A shim arm is pivotally mounted to and extends along the base. A shim support pad is mounted at the free end of the arm and its upper surface is in the same plane as the upper surface of the base. The shim arm swings out from the base so that the pad forms a support on which the working board rests to effectively increase the width of the base.

Abstract: A dowel jig for making holes in a member such as a board to accept dowels for projecting toward corresponding holes for receiving the dowels to make butt, end and T type dowel joints for two members. The jig has a base having an internal planar area and at least one hole transversely through the planar area and a transverse leg at each end of the base. A foot is at the outer corner junction of each base end and transverse leg and the lower surfaces of both feet lie in a common plane that is parallel to the base internal planar area so that when the lower surfaces of the feet are placed on the flat upper surface of a member the base hole will be transverse to the flat surface to permit aligned passage of a drill bit to drill a hole in the member transverse to the flat surface. Notches are provided in each of the feet along a line that passes through the hole center to hold a rod in which a hole is drilled.

Abstract: An ultrasonic liquid level sensor instrument that combines a continuous transmitter that transmits though the air for measuring the level of liquid in a vessel on a continuous basis and a point level sensor that sets a high level alarm. The continuous level transmitter/receiver provides a continuous measurement of the liquid level in the vessel and the point level sensor is used for sensing an overflow, or high level condition in the vessel, as well as failure of the continuous transmitter/receiver. The instrument includes a sensor fixture that holds both the continuous air transmitter/receiver transducer and the point level sensor. The fixture is mounted in a single hole in the wall of a tank or a vessel in which the liquid level is being monitored. Each of the continuous level transmitter/receiver and point level sections of the instrument has a self check capability.