Prestart oil-pressurizing device

Claim 2

A prestart pressurizing device for an internal combustion engine having an ignition means and a lubricating system pressurized when the engine is running and depressurized when the engine is not running and during its starting period, said device comprising: a. a lubricant reservoir; b. a lubricant line connected with said lubricating system for flow of lubricant to and from said systems; c. a forward flow passage from said lubricant line to said reservoir for delivery of lubricant under pressure to said reservoir; d. a backward flow passage from said reservoir to said lubricant line for delivery of lubricant from said reservoir to said system when said system is depressurized; e. a valve means communicating between said passages and having a first position closing said forward flow passage in response to pressure favoring said backward flow passage and a second position closing said backward flow passage in response to pressure favoring said forward flow passage; f. and momentary operating means for bleeding pressure from said forward flow passage when said lubricant system is depressurized to move said valve means to said first position, thereby to permit backward flow of lubricant from said reservoir.

Claim 3

A device, as defined in claim 1, wherein: a. said momentary operating means includes a solenoid; b. and a pressure sensitive switch in series with said solenoid is located in said backward flow passage, said switch being closed when the lubricating system is depressurized and opened when the lubricating system is pressurized.

Claim 4

A device, as defined in claim 1, wherein: a. said valve means includes a valve bore having ends intersecting said passages, and a slide valve member movable between the ends.

Claim 5

A prestart pressurizing device for an internal combustion engine having an ignition means and a lubricating system pressurized when the engine is running and depressurized when the engine is not running and during its starting period, said device comprising: a. a lubricant reservoir; b. means for pressurizing said reservoir with lubricant from said lubricating system; c. a main valve means for retaining lubricant in said reservoir when said lubricating system is depressurized; d. a pilot valve means operably connected with said ignition means for opening said main valve means to effect rapid return of lubricant to said system during the starting period of said engine; e. and pressure sensitive means exposed to pressure in said lubricating system to prevent operation of said pilot valve when said lubrication system is pressurized.

Claim 6

A prestart pressurizing device for an internal combustion engine having an ignition means and a lubricating system pressurized when the engine is running and depressurized when the engine is not running and during its starting period, said device comprising: a. a lubricant reservoir; b. means for pressurizing said reservoir with lubricant from said lubricating system; c. a main valve means for retaining lubricant in said reservoir when said lubricating system is depressurized; d. a pilot valve means operably connected with said ignition means for opening said main valve means to effect rapid return of lubricant to said system during the starting period of said engine; e. and pressure sensitive means exposed to pressure in said lubricating system to prevent operation of said pilot valve when said lubrication system is pressurized.

Claim 7

A prestart pressurizing device for an internal combustion engine having an ignition means and a lubricating system pressurized when the engine is running and depressurized when the engine is not running and during its starting period, said device comprising: a. a lubricant reservoir; b. a lubricant line connected with said lubricating system for flow of lubricant to and from said system; c. a valve body interposed between said reservoir and said lubricant line, said valve body including a backward flow passage between said reservoir and said lubricant line having a first check valve therein, a forward flow passage between said lubricant line and said reservoir having a second and a third check valve therein; d. said valve body also including a cross bore intersecting said backward flow line between said reservoir and first check valve, and intersecting said forward flow line between said second and third check valves; e. a slide valve movable in said bore in response to pressure favoring said rearward flow passage to a first position closing said forward flow passage and movable in response to pressure favoring said forward flow passage to a second position closing said backward flow passage; f. and solenoid operated means operable to open said third check valve thereby to bleed pressure from said forward flow passage and cause said slide valve to move to its first position and permit backward flow of lubricant to said lubricating system.

Claim 8

A prestart pressurizing device for an internal combustion engine having an ignition means and a lubricating system pressurized when the engine is running and depressurized when the engine is not running and during its starting period, said device comprising: a. a lubricant reservoir; b. a lubricant line connected with said lubricating system for flow of lubricant to and from said system; c. a valve body interposed between said reservoir and said lubricant line, said valve body including a backward flow passage between said reservoir and said lubricant line having a first check valve therein, a forward flow passage between said lubricant line and said reservoir having a second and a third check valve therein; d. said valve body also including a cross bore intersecting said backward flow line between said reservoir and first check valve, and intersecting said forward flow line between said second and third check valves; e. a slide valve movable in said bore in response to pressure favoring said rearward flow passage to a first position closing said forward flow passage and movable in response to pressure favoring said forward flow passage to a second position closing said backward flow passage; f. and solenoid operated means operable to open said third check valve thereby to bleed pressure from said forward flow passage and cause said slide valve to move to its first position and permit backward flow of lubricant to said lubricating system.

Claim 9

A device, as defined in claim 5, wherein: a. a pressure sensitive switch is exposed to pressure in said lubricant line for rendering said solenoid operated means ineffective when said lubricating system is pressurized.