Abstract: A combination door lock and alarm has an upper end clip engageable with the door handle, a shaft extending in an adjustable length tube and terminating in a non-skid rubber end adapted to engage the floor or carpet. The clip at the upper end of the shaft is angularly mounted and has its lower end lying in a plane substantially aligned with the longitudinal axis of the shaft. An alarm device is also mounted on the shaft and includes an actuator for it with a switch contact normally abutting or close to abutment with the surface of the door at a point below the door handle. Responsive to inward movement and pressure on the door the alarm will be actuated. At the same time, the locking action of the shaft and clip will divert the opening inward forces into forces directed against the floor so that the door cannot be opened.

Abstract: A musical instrument combination including a rocket engine type combustion chamber and a system for firing it either by single drum beat control or by variable frequency control pulses. The effect achieved by the rocket engine output sound is similar to that of a pipe organ and resonator and further is of a pitch controllable by the barrel length and diameter of the rocket engine chamber exhaust structure.

Abstract: A heater usable for indoor and outdoor use including a body having an upper and a lower portion. The two portions are separated by a grate adapted to support a solid fuel within the upper portion. The lower portion is operable to receive a receptacle for a lighted semi-solid fuel. The heater can be used in two modes, in a high heat output mode in which the solid fuel is first lit by the semi-solid fuel that is then removed or in a lower heat output mode in which the upper solid fuel is dispensed with and the heat is given off by the lower portion semi-solid fuel receptacle only. The upper portion of the heater is selectively closed or opened by a lid to allow heating operation or to provide damping operation when the lid is in its lowered position.

Abstract: The golf putter head includes a planar bottom and a vertical slot alignable with a lower angled painted surface to insure proper positioning of the eyes and head when setting up and executing a putt. The vertical slot and the line which one sees through it from the brightly painted surface is perpendicular to the face of the putter in the approximate center of the striking face. This line when set up with the line of the putt squares the face of the putter with the line of the putt. Thus, by grounding the club on its essentially flat bottomed surface, positioning one's head to see the line on the fluorescent surface, aligning the viewed line to the line of the putt, positioning one's body parallel to both lines, and swinging the club down the putt line, it is possible to strike almost all putts with the striking face square to the line of the putt. An alternate embodiment in place of the slot provides a single or a series of vertical holes on a line perpendicular to the putter striking face.

Abstract: A platform is used to climb a tree to an elevated position. A means is connected to the platform to latch it in a secure position so that a hunter may sit or stand on the platform in a hunting position. In a second use of the device, a forward v-shaped tree gripping portion of the platform is flipped over and carries a pair of wheels at one end thus to provide a wheeled platform and cart arrangement for removing game from the forest.

Abstract: A sawhorse including a pair of V-cut-out or shaped side portions joined together by a vertical hinged portion. The sawhorse is openable for use and when folded side by side together can easily be carried.

Abstract: The servo circuit is operable to monitor gap conditions on any number of working leads up to four at the same time. It further has the capability of responding to high voltage operating conditions and then reducing the gap voltage being sensed to an appropriate level. An analog stage is then employed to pick out the most valuable information being provided from the several gap leads. An amplifier of the FET type is used to provide high input impedance to the circuit. An absolute value circuit is further included which in either polarity will rectify the gap signal back to the positive level.

Abstract: Included in the circuit are a pair of counter timer circuits, a pair of inverters and a D-type flip flop. The inputs of the counters are tied to a programmable computer buss. A number is loaded into the first counter representative of machining power pulse on-time and a second number is loaded into the second counter representative of machining power pulse off-time.As the first counter counts to 0, the pulse output from the first counter is passed through an inverter to the second counter to enable it. After the second counter counts to 0 there will be provided an output through the second inverter to initiate the operation of the first counter. The pulses which are produced at the termination of each count provide operation of a following flip-flop stage which is toggled to provide on-off time for the machining power pulses to the following power module of the electrical discharge machining apparatus.

Abstract: A programmable system for controlling maximum machining current. A current limit is entered into the system together with the on time and off time desired. The system operates to use the entered on-time and current values, but the off time will be modified depending on the maximum current limit possible. This will protect the apparatus when an impossible combination has been entered by the operator. The duty cycle is checked against a maximum level such as 87% or a like upper limit.

Abstract: Included in the power supply is an output module connected to the gap which module uses a power FET. This module has its current output and the current to the gap controlled as a linear function of the control voltage applied to the gate of the FET. A suitable input means for the control voltage, includes manually controlled potentiometers, microprocessors, keyboards and the like.

Abstract: A protection system circuit which senses and responds to abnormal gap voltage condition. The circuit is operable in either positive or negative polarity of the gap. The circuit includes two branches, one relating to positive gap polarity and the other to negative polarity. The appropriate one of the two branches is selected by enabling one of two comparators in the respective branches.

Abstract: The system includes a standard servo feed arrangement in which responsive to gap voltage, servo feed is controlled for the electrode tool or alternately the workpiece.A further part of the system includes a gap voltage sensing lead and an analog to digital converter. At a predetermined point, a programmable computer is activated to provide an output signal through a digital to analog converter to influence the servo feed being controlled by the standard type servo feed system.The output from the programmable computer is weighted with respect to the output amplifier to provide a predetermined ratio of magnitude of control. A further embodiment of our invention is a system similar to the servo system described above, but in which the additional control over the servo feed system is exercised responsive to power level sensed in the EDM gap.

Abstract: A digitally controlled and free-running multivibrator for the power supply is used to supply machining power pulses of predetermined ON and OFF time duration. The pulse output from the digital multivibrator is passed through at least one intermediate drive stage to trigger an electronic output switch, which is operatively connected both to a main DC power source and the gap, to actually provide the machining power pulses thereto. Responsive to a predetermined drop in gap voltage, a digitally predetermined extended OFF time is added.

Abstract: A system for transmitting torque to a driven member from a drive shaft extending axially throughout the driven member which is itself of a tubular shape. The drive shaft is of a circular cylindrical configuration and at least one resilient spherical drive element is used to transmit torque between the drive shaft and the driven tubular member. The diameter of the resilient member is somewhat greater than the distance between the opposed surfaces of the drive shaft and the driven tubular member. A means is included on either or both the drive shaft and tubular member to retain the resilient member in a substantially fixed orbiting path and to retain it against longitudinal movement along the surfaces of the drive shaft and the driven tubular member.

Abstract: Gap current is sensed and a voltage signal representative of gap current is integrated to provide a relatively stable DC voltage that is proportional to average current at the gap. A reference setting is made to which the average gap current is compared and, responsive to rise in current above that level, cutoff of the power supply will be initiated.

Abstract: An improved high voltage module for use in conjunction with a standard power module. The high voltage module includes a floating power supply in parallel with the standard power module and without ground connection included in the high voltage module are a plurality of stages of Darlington amplifiers. The two modules are opticoupled in the circuit with provision for fast turn-on and turn-off networks for the opticoupling network.

Abstract: A hanger for pipes particularly those of relatively large diameter and made of plastics or the like that cannot be hung directly on wires. The hanger includes a curved wire portion with a pair of upward pointed ends to be driven into a wood or other structural member. A strap portion is mounted on the wire portion to distribute the weight of the pipe.

Abstract: A process for determining lecithin concentration in biological fluids such as blood and amniotic fluids including the steps of separating the lecithin from the fluid and isolating the separated lecithin from similar phospholipids by column chromatography. The separated lecithin is then hydrolyzed and formed into chromogens. The evaluation of the concentration of the lecithin is done by spectrophotometric measurement.