A quick and safe method of raising a motor vehicle tire off the ground for changing a flat or rotating the tires, comprising the steps of:
- providing a pneumatic jacklift system mounted to a lower frame of said motor vehicle, said pneumatic jacklift system further comprising:
- two or more pneumatic jack devices mounted to the lower frame of said motor vehicle, each of said jack devices further comprising:
- an upper cylindrical high-pressure pneumatic chamber, said chamber having a high pressure air inlet for attaching an external air hose, said pneumatic chamber further having an electrically operated solenoid valve means for operating said jack device, said pneumatic chamber still further having a quick release air outlet fitting for attaching an auxiliary air hose;
- an outer cylindrical high-pressure housing extending downward from the bottom end of said pneumatic chamber, said outer housing having aligned through-holes on each side near the bottom of said housing for accepting a quick release safety-locking pin;
- a solid cylindrical lift rod slidably mounted inside said outer cylindrical housing, an interface between said outer cylindrical housing and said solid cylindrical lift rod being comprised of a high-pressure sealing means, said solid cylindrical lift rod having a series of equally spaced through-holes for accepting said quick release safety-locking pin;
- a momentary electrical switch for applying and releasing air pressure to said solenoid valve for raising said jack devices;
- a solid support plate mounted to the bottom of said solid cylindrical lift rod for contacting the ground, said support plate further having a horizontal storage securing tab with a through-hole extending from one side for accepting a quick release position-locking pin;
- a C-shaped chassis mounting bracket mounted to the top end of said upper cylindrical pneumatic chamber by rotative attachment means, said bracket allowing said pneumatic jack device to be rotated at least 90-degrees to a near horizontal position for storage, said bracket having a through-hole for accepting a position-locking pin, said bracket further having at least four mounting holes in the top surface for mounting each of said jack devices to a motor vehicle frame;
- a horizontal stowaway bracket for storing said jack device in an out of the way horizontal position, said stowaway bracket having a through-hole for accepting said position-locking pin, said stowaway bracket further having mounting holes in the top surface for mounting to said motor vehicle frame;
- said position-locking pin inserted through said through-hole in said C-shaped chassis mounting bracket to secure each of said jack devices in a downward operational position for lifting said motor vehicle, said position-locking pin further being inserted through said through-hole in said horizontal stowaway bracket and said storage securing tab on said solid support plate for storing each of said jack devices in a horizontal position, said position-locking pin further being attached to said stowaway bracket by means of a retaining chain to prevent losing said pin;
- and
- said quick release safety-locking pin inserted through said through-holes in said outer cylindrical housing and a desired hole in said solid cylindrical lift rod for securing each of said jack devices for use or storage;
- an air compressor mounted in the engine compartment of said motor vehicle, said compressor driven by belt means off of said motor vehicle's engine;
- an air tank for storing compressed air, said tank being connected to the output of said air compressor by high-pressure hose means;
- each of said jack devices being connected to the output of said air tank by individual high-pressure hoses;
- said electrical switch on each of said jack devices being wired to said motor vehicle's battery;
- and
- a system activation switch wired from said motor vehicle's battery to each of said jack devices switch, said system activation switch mounted internal to said motor vehicle;
- activating said system using said system activation switch mounted internal to said motor vehicle to turn ON said air compressor;
- removing said quick release position-locking pin from said stowaway bracket of one or more said pneumatic jacklift devices, allowing each of said jacklift devices to swing downward in a vertical operational position above the ground;
- reinserting said quick release position-locking pin into said through-holes in said C-shaped chassis mounting bracket, thereby securing each of said jacklift devices in an operational position;
- removing said quick release safety-locking pin from said through-hole in said outer cylindrical housing, thereby releasing said solid cylindrical lift rod;
- holding said electrical switch on each of said jacklift devices in the extend position until the tire is lifted off the ground by a desired height;
- continuing lifting said tire until said through-hole in said outer cylindrical housing aligns with the next through-hole in said solid cylindrical lift rod;
- inserting said quick release safety locking-pin into said through-holes in said outer cylindrical housing and said through-hole in said solid cylindrical lift rod, thereby preventing the possibility of said motor vehicle falling in the event of air pressure loss;
- holding said electrical switch on each of said jacklift devices in the retract position momentarily to slightly lower said jacklift on-to said quick release safety-locking pin, thereby securing said motor vehicle;
- changing said tire;
- holding said electrical switch on each of said jacklift devices in the extend position momentarily to slightly raise said jacklift up off said quick release safety-locking pin;
- removing said quick release safety-locking pin;
- holding said electrical switch on each of said jacklift devices in the retract position, thereby releasing said compressed air allowing said motor vehicle to lower to the ground;
- pushing said solid cylindrical lift rod up into said cylindrical outer housing;
- inserting said quick release safety-locking pin through said through-holes in said outer cylindrical housing and the bottom through-hole in said solid cylindrical lift rod;
- removing said quick release position-locking pin from said C-shaped chassis mounting bracket;
- swinging each of said jacklift devices upward into a horizontal position;
- inserting said quick release position-pin through said stowaway bracket and said storage securing tab on said ground support plate, thereby securing said jacklift device in an out of the way position;
- and
- turning OFF said jacklift system switch, thereby dumping any remaining compressed air from said air tank.