Patents Assigned to Davco Manufacturing Corporation
  • Patent number: 5372116
    Abstract: A fuel pressure pulsation dampener valve is disclosed as having a housing with an internal chamber into which inlet and outlet tubes communicate to transfer fuel under pressure to the fuel injectors of an internal combustion engine. The outlet tube of the valve includes a plurality of ports which are positioned in the valve below the normal operating fuel level of the engine while the opening from the inlet tube through which fuel is supplied to the interior of the valve is positioned above such fuel level. A bleed orifice above the inlet tube opening communicates the interior of the valve to the return line of the fuel system.
    Type: Grant
    Filed: September 15, 1993
    Date of Patent: December 13, 1994
    Assignee: Davco Manufacturing Corporation
    Inventor: Leland L. Davis
  • Patent number: 5307770
    Abstract: A priming pump valve for use in conjunction with a fuel system, such as a diesel engine, that does not result in a lag in the fuel flow during normal system operation. The priming pump valve has a control valve movable between a first position for normal operation and a second position for priming that allows for efficient priming of the fuel system when in the priming mode and unrestricted flow of fuel during normal operation of the engine.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: May 3, 1994
    Assignees: Davco Manufacturing Corporation, Dapco Industries
    Inventors: Stephen D. Davis, Willis E. Tupper
  • Patent number: 5307782
    Abstract: A fuel pressure pulsation dampener valve is disclosed as having a housing with an internal chamber into which inlet and outlet tubes communicate to transfer fuel under pressure to the fuel injectors of an internal combustion engine. The outlet tube of the valve includes a plurality of ports which are positioned in the valve below the normal operating fuel level of the engine while the opening from the inlet tube through which fuel is supplied to the interior of the valve is positioned above such fuel level. A bleed orifice above the inlet tube opening communicates the interior of the valve to the return line of the fuel system.
    Type: Grant
    Filed: March 16, 1992
    Date of Patent: May 3, 1994
    Assignee: Davco Manufacturing Corporation
    Inventor: Leland L. Davis
  • Patent number: 4883943
    Abstract: A coupling for connecting a fuel delivery conduit to the discharge opening of a diesel fuel tank includes a hollow fitting body defining a flow passage in which is located an electric heating rod for heating the fuel as it flow through the passage from the tank to the conduit to prevent waxing of the fuel at low temperatures. A passive heat transfer member, which may be a solid metal rod or an elongated cylindrical heat pipe, is thermally and mechanically coupled at one end to the heating rod and is of sufficient length and is so arranged that its other end extends into the tank through the discharge opening for directing a portion of the heat to the fuel near the discharge opening.
    Type: Grant
    Filed: December 16, 1987
    Date of Patent: November 28, 1989
    Assignee: Davco Manufacturing Corporation
    Inventor: Leland L. Davis
  • Patent number: 4706636
    Abstract: A fuel delivery system particularly useful for supplying petroleum distillate fuels to a fuel combustion device is described. When such device is operated in cold ambient conditions, fuel clogging can occur in the fuel supply lines. In the past, attempts to overcome such problems have been directed toward applying heat to the portions of the conduits subject to restrictions or by introducing solvents into the fuel. These steps are, however, unsatisfactory. In accordance with this invention, the fuel supply conduits are drained of fuel upon shut-down of the associated engine or other fuel fired device. Upon an engine start-up command, a small quantity of fuel is warmed, preferably using an electric immersion type heater. Once a sufficient fuel temperature is reached, the fuel conduits are reprimed with fuel. Since the fuel does not cold soak in these conduits, fuel clogging problems are eliminated. Various methods for venting the fuel supply conduit enabling such purging and priming is described.
    Type: Grant
    Filed: December 6, 1984
    Date of Patent: November 17, 1987
    Assignee: Davco Manufacturing Corporation
    Inventor: Leland L. Davis
  • Patent number: 4680110
    Abstract: A fuel processor device is described which is particularly adapted for replacing existing fuel filters of diesel powered machines and fuel consuming devices. The fuel processor designs described have inlet and outlet passages within their upper surface and include a lower plate assembly which provides a mounting location for various elements such as water sensors, drain valves, temperature sensors and heaters which are provided in accordance with the user's needs. The lower plate assembly may be mounted directly to a housing by a through bolt or matching threads or may be made integral with the fuel processor housing. The fuel processor device may include an integral throwaway filter element or the element may be integrated with the fuel processor housing. Various control means may be employed in connection with the fuel processor disclosed wherein the automatic drain water or other accumulated impurities from the lower portion of the fuel processor housing.
    Type: Grant
    Filed: June 25, 1984
    Date of Patent: July 14, 1987
    Assignee: Davco Manufacturing Corporation
    Inventor: Leland L. Davis
  • Patent number: 4612897
    Abstract: A heated fuel delivery system joint and method is disclosed which is most advantageously employed in connection with a fuel oil delivery system for a diesel engine powered motor vehicle. In such fuel delivery systems, fuel processor devices are often employed to prevent fuel clouding and waxing and ice accumulation from restricting fuel flow to the engine. Even when such fuel processors are used, excessively low temperatures of fuel can cause fuel supply problems in fittings and conduits which connect the fuel tank to the fuel processor. In accordance with this invention, these fittings and conduits are warmed by removing a portion of the heated fuel exiting from the fuel processor and introducing it into a fitting at the fuel tank discharge port. By mixing the warmed fuel with cold fuel withdrawn from the fuel tank, the combined temperature of the fuel is increased, thereby minimizing problems associated with excessively cold fuel.
    Type: Grant
    Filed: September 24, 1984
    Date of Patent: September 23, 1986
    Assignee: Davco Manufacturing Corporation
    Inventor: Leland L. Davis
  • Patent number: 4579653
    Abstract: A fuel processor device particularly useful for separating water and other impurities from diesel fuel. The fuel processor according to the invention features a vertically elongated housing where fuel is initially transmitted wherein water and heavy particulates are removed therefrom. The housing includes a manually or automatically actuated drain valve, a fuel inlet fitting, and an optional heating device. After passing through the housing, the fuel is conducted to a particulate filter, preferably of the spin-on variety, which is mounted to a head which communicates with a fuel processing housing. The filter is positioned in side-by-side relation with the fuel processor housing. A first embodiment according to this invention describes the use of a horizontal elongated head which communicates the upper portion of the housing with a filter mounting pad.
    Type: Grant
    Filed: August 17, 1984
    Date of Patent: April 1, 1986
    Assignee: Davco Manufacturing Corporation
    Inventor: Leland L. Davis
  • Patent number: 4539109
    Abstract: A drain system adapted for use in fuel processing devices, as well as in other fluid equipment applications, includes sensing means for detecting the presence of a predetermined quantity of water or other impurities separated from the fuel, or the presence of other fluids, in an enclosure or container. Drain means are also included for discharging at least a substantial portion of the predetermined quantity in response to said detection of the presence thereof. The drain means is preferably actuated and deactuation by automatic control means in order to maintain said water or other impurities, or said other fluids, at or below the predetermined quantity. The fuel processing device herein further includes means for heating fuel in order to prevent fuel waxing and clouding.
    Type: Grant
    Filed: January 23, 1984
    Date of Patent: September 3, 1985
    Assignee: Davco Manufacturing Corporation
    Inventor: Leland L. Davis
  • Patent number: 4519653
    Abstract: An anti-theft device, having application for preventing unauthorized operation of a vehicle, includes a moveable lock member biased toward the actuating member for the vehicle's parking brakes. An electric solenoid is energized along with the ignition system to retract the lock member and allow the parking brakes to be released. The preferred device also includes a timer apparatus that requires the parking brakes to be released according to a predetermined timing sequence in order to substantially prevent theft of the vehicle.
    Type: Grant
    Filed: September 23, 1982
    Date of Patent: May 28, 1985
    Assignee: Davco Manufacturing Corporation
    Inventor: Paul B. Smith
  • Patent number: RE34166
    Abstract: A new fuel processor apparatus for diesel engines, particularly diesel engine powered vehicles, with the apparatus having no moving parts and no internal gaskets or connections to leak or deteriorate, and said apparatus being capable of removing water from the diesel fuel while promoting filterability and combustion efficiency of the fuel.The questions raised in reexamination request No. 90/001,642, filed Nov. 22, 1988, have been considered and the results thereof are reflected in this reissue patent which constitutes the reexamination certificate required by 35 U.S.C. 307 as provided in 37 CFR 1.570(e).
    Type: Grant
    Filed: October 9, 1990
    Date of Patent: January 26, 1993
    Assignee: Davco Manufacturing Corporation
    Inventor: Leland L. Davis
  • Patent number: RE34178
    Abstract: A new fuel processor apparatus for diesel engines, particularly diesel engine powered vehicles, with the apparatus having no moving parts and no internal gaskets or connections to leak or deteriorate, and said apparatus being capable of removing water from the diesel fuel while promoting filterability and combustion efficiency of the fuel.The questions raised in reexamination request No. 90/001,643, filed Nov. 22, 1988, have been considered and the results thereof are reflected in this reissue patent which constitutes the reexamination certificate required by 35 U.S.C. 307 as provided in 37 CFR 1.570(3).
    Type: Grant
    Filed: October 9, 1990
    Date of Patent: February 16, 1993
    Assignee: Davco Manufacturing Corporation
    Inventor: Leland L. Davis