摘要:
A protective housing for a jump-starting battery pack includes a flexible sheet of multi-layered, electrically insulating fabric material including inner and outer nylon layers and a foam padding layer sandwiched therebetween adapted to be folded around the case of a battery pack positioned in the middle of the sheet and held closed by Velcro-type closures. Retaining straps secure the battery pack in place, one of the straps having stacks of secured-together folds positioned on opposite sides of the case to provide supports on which the connector clamps of the battery pack jumper cables can be clamped, with the cables projecting from the open top of the housing to serve as handles.
摘要:
A torque-angle wrench is provided with a handle for applying torque, such as to a fastener or bolt, through a tightening angle, at a rotational angular velocity. A piezoelectric gyroscopic sensor device including circuitry for vibrating an oscillating body is coupled to the wrench. As the wrench is rotated through the tightening angle, its rotational angular velocity causes the vibrating body to alter its direction of vibration. The new vibrating pattern is sensed and converted, by appropriate sensing circuitry, into an electrical signal proportional in intensity to the rotational angular velocity of the wrench. The electrical signal can be electronically processed by appropriate conversion and display circuitry to provide a visual indication of the tightening angle. Such conversion and display circuitry can be integral with the wrench or as part of an adaptably coupled meter non-integrally connected to the sensor device.
摘要:
A portable battery jump start unit includes a portable, plastic, clamshell-type housing including a box-like open-top base and a box-like, open-bottom cover hingedly connected together for movement between open and closed conditions. A lead-acid battery is disposed in the housing, along with a state-of-charge monitoring circuit connected to the battery terminals and including a visible indicator viewable through an aperture in the housing. Cables are connected to the battery terminals and respectively extend through openings formed by cooperating notches in the mating edges of the base and cover, the cables respectively having clamp connectors at their distal ends which can be clamped onto posts projecting laterally outwardly from the sides of the base. A charger jack in the base is connected to the battery terminals for receiving a charger connector.
摘要:
A charging circuit for a lead-acid battery pack includes a sacrificial battery with a voltage less than that required to charge the lead-acid battery and connected across the input terminals of a power converter, which boosts the sacrificial battery voltage to an output voltage sufficient to charge the battery pack. A processor operating under stored program control is connected across the lead-acid battery and monitors its voltage and produces an output signal when the voltage drops below a predetermined level, for triggering the power converter to apply its boosted voltage to the lead-acid battery for charging. The processor program ignores normal battery voltage conditions which occur during normal operation of an associated device powered by the lead-acid battery and will activate the power converter only when the lead-acid battery voltage has reached a significantly low level or has reached a low level for a sufficiently long period of time, to be consistent with a deep discharge condition of the lead-acid battery.
摘要:
A keeper battery pack includes a housing incorporating an array of series-connected alkaline battery cells coupled to a cable extending outside the housing and terminating in a quick-connect connector plug adapted to plug into the charger port of a portable lead-acid battery power pack ofthe type used for jump-starting automotive vehicles. The keeper pack is portable and can maintain the charge on the battery power pack during extended periods of non-use, such as during storage, transportation and the like.
摘要:
In one form, tester for an electrical system, such as for a vehicle, develops repetitively applied, short duration, control current pulses for reducing load current pulses through the electrical system. An operator connects a pair of input contacts across a fuse holder. A circuit between the input contacts is closed momentarily and repetitively to produce repetitive current pulses from the electricity source through the system. A perceptible alert is produced when the magnitude of the current pulse exceeds that of a prescribed reference current value. In another form, a tester for an electrical system is designed to plug into the fuse terminals in a fuse box. The tester can include a plurality of interchangeable circuit breaker modules to allow the tester to be used on circuits having differing current ratings.
摘要:
A usage counter has input terminals connectable to the terminals of a jump-starting battery pack. The counter has an IC comparator which generates an output signal when battery voltage drops below a predetermined reference level. If the output signal persists for a predetermined time period, indicating an attempt to jump-start an engine with the battery pack, an IC timer is triggered to output a count pulse which is inverted and then counted and displayed by an IC counter/display circuit. The usage counter circuit is powered by the battery pack and has a Zener diode which provides to the IC circuits a limited supply voltage which is unaffected by voltage spikes which might appear at the battery pack terminals. A capacitor maintains the reference voltage level despite momentary drops in battery terminal voltage.
摘要:
A battery and charging system tester includes an automatically-operated carbon pile for loading the battery, the pile having a shaft therethrough rotated by a stepper motor, and a compression nut threadedly engaged with the shaft for movement into and out of engagement with the carbon pile in response to rotation of the shaft for varying the compression of the pile and, thereby, the impedance thereof. Probes are provided for sensing battery load current and output voltage, and the output current of an alternator charging unit. A feedback control circuit including a microprocessor operating under stored program control converts the analog probe outputs to digital signals and compares the battery output voltage and load current to selectively variable references for controlling the stepper motor to vary the battery load so as to regulate either the battery load current or the battery output voltage to a predetermined reference value, depending upon the test being performed. A selectively variable timer controls the time period during which the battery is loaded. A display indicates the reference values, the values of the parameters being regulated and the state of the timer.
摘要:
A first signal at a first frequency which is a selected harmonic of the resonant frequency of a bolt in a first loaded condition is determined. Then there is determined a second signal at a second frequency being the same harmonic of the resonant frequency of the bolt in a second loaded condition. Both frequencies are multiplied by a factor M. The up input of a counter receives one of the signals for a predetermined duration, and the down input receives the other signal for the same duration. The number of pulses remaining in the counter is representative of the difference in load between the first and second loaded conditions.