A hydraulic system including a pressure and flow compensated pump, a source of pilot fluid under pressure, a plurality of hydraulic circuits each including a work performing device, a plurality of controls, one for each circuit, each including a pilot operated flow valve for connecting the associated work performing device to the pump and an operator positioned valve connected to the pilot source for selectively directing pilot fluid to the corresponding flow valve, the work performing devices a...

A system for apportioning serially supplied data among eight contending memory banks tends to equalize usage among the banks despite their arrangement in a predetermined, sequential priority. Each bank has a data hold register, an OR logic gate to generate a request signal whenever its register contains data, and a negative AND gate for enabling the bank for clearing data from its register. All except the lowest priority bank further include a blocking latch and an enabling NOR gate. Each blocki...

Disclosed herein is a signal priority device responsive to the audio output signal of a citizen band (C.B.) transceiver for switching the response of a common speaker system from the audio output signal of a radio receiver to the audio output signal of the C.B. transceiver. The disclosed signal priority device is connected between the existing audio output jacks of the radio receiver and the C.B. transceiver and a common speaker system, and automatically integrates the operation of the two separ...

An improvement to a priority valve which provides priority flow to a priority function, not only directly from a fluid power source, but also from an accumulator when the priority demand exceeds the output of the fluid power source. This priority flow valve also provides flow to one or more secondary functions when the priority flow requirements are satisfied or when the priority flow path is blocked.

The invention provides a priority selector for external signals having a tri-mode converting circuit with a switching part, wherein a TV signal or external signals are selected by operating a converting switch of the switching integrated circuit in response to fast blanking (F/B) signal, and a priority-giving part, wherein one of the external signals is selected by converting the converting switch of the switching integrated circuit in response to the fast blanking (F/B) signal. Simplifying the ...

A hydraulic priority circuit for a fork lift truck having a primary work system for providing power steering and a secondary work system for raising a fork along a mast and for tilting the mast. A variable speed electric motor drives a variable output pump to supply pressurized fluid which is divided by a flow divider into two streams leading to the primary and secondary work systems, respectively. A priority solenoid valve is controlled by a device which detects preselected conditions of the tr...

A temperature control system controls operation of two heaters, such as the solution heater and dryer heater of a photographic processor. First and second temperature detectors sense temperature and provide first and second detector signals, which are compared with first and second reference ramp signals by first and second comparators. The comparators produce first and second inhibit signals, which prevent power from being supplied to the first and second heaters, respectively. A priority circu...

The present invention provides asynchronous priority select logic for allowinig an individual station on a token ring network to hold a token for asynchronous transmission only for a specified maximum time period. The asynchronous priority select logic comprises a token rotation timer for timing token rotations on the ring from arrival to arrival. A token holding timer limits the amount of ring bandwidth used by the station for asynchronous transmission after the token is captured by the station...

An exposure control apparatus operating with selection of the diaphragm preselection and shutter preselection automatic exposure control modes is provided with first and second signal shapers arranged to cooperate with a lens aperture mechanism through a common intermediate member. Upon setting of a desired diaphragm value in the lens aperture mechanism, the intermediate member is driven along with the first signal shaper in exactly corresponding relation. In the shutter preselection automatic d...

A system for accelerating the granting of prioritized memory requests to a multi port memory system of a data processing system is disclosed. The priority requestor accelerator system detects the fact that one remaining requestor is in the priority memory system. The priority system logic is cleared out before the end of the normal requestor cycle. This allows the acceptance of a new set of requestors to be presented to the priority circuits at that time rather than waiting until presentation of...