Robust consumer lifting device- three stage jack stand

A three stage jack stand for use with a power unit, comprising

• a rectangular base plate;
• a first stage tubular housing having a forward side, a rearward side, a left and right side, an upper end and a lower end, with the lower end attached to said base plate and said housing extending vertically therefrom;
• a second stage “U” shaped ratchet shaft having a back side, left side, right side, an upper end and a lower end, with ratchet teeth on the forward edges of the sides, telescopically inserted within said housing and extendable and retractable therein;
• said ratchet shaft further including a pair of reinforcing ratchet plates secured to the front edges of the left and right sides thereof,
• an upper base attached to the upper end of said ratchet shaft and including a front half and a back half, each having a lower portion extendable and retractable within the upper end of said housing, and having a flanged upper portion extending outwardly from said housing, and with the front and back halves spaced apart providing a vertical opening in each side, said upper base having a front side, a left side, a right side, and having a vertical cylindrical opening therein;
• a third stage tubular shaft having an upper end, a lower end, a front side, a left side and a right side, and having ratchet teeth in the left and right sides thereof;
• and telescopically positioned within the opening in said upper base and extendable and retractable therein;
• said tubular shaft further including a longitudinal channel in the front side thereof;
• and said upper base further including a protrusion extending into the channel for stabilizing and orienting said tubular shaft within said upper base,
• said housing further including a vertical slot in at least one side thereof;
• and said ratchet shaft including a guide lug mounted on at least one side near the lower end of said ratchet shaft and adapted to extend into and slide within the slot in said housing, for retaining and stabilizing said ratchet shaft in said housing,
• a lift collar mounted on the upper end of said third stage shaft having a threaded vertical aperture through the center thereof for receiving a screw-out extension;
• a pair of lower pawls interconnected by a lateral pin, pivotally attached to the forward side at the upper end of said housing;
• with each lower pawl adapted to be engagable with a respective tooth on the forward edges of said second stage shaft;
• a pair of upper dogs, each pivotally mounded on opposed sides of said upper base, having an upper end and a lower end, with the upper ends adapted to be engagable with a respective tooth of said tubular shaft,
• an elastic spring having an up end attached to the upper base end and a down end attached to the upper dogs for biasing the upper ends into engagement with said tubular shaft, and with the lower ends having inclined outer sides for slidable engagement within the upper end of said tubular housing for rotating the upper ends of said dogs into disengagement with the ratchet teeth of said third stage shaft when said upper end of said second stage shaft is positioned within said tubular housing;
• said left upper dog further “S” shaped and said right upper dog further “reverse S” shaped, with each having an aperture near the center thereof for pivotally mounting said upper dog on a pivot pin within said upper base, and each having a lower axle located parallel with and outboard of the aperture for retaining the down end of said elastic spring;
• an actuator spring having an upper end secured to said lateral pin forming a handle for rotating said lower pawls into engagement with the teeth of said second stage shaft, and further for rotating said lower pawls into disengagement from the teeth of said shaft, and having an upper end attached to the lateral pin, and having a generally vertical handle portion, and having a generally horizontal lower portion including a first position indention and a second position indention;
• said housing further including a slotted opening adapted to receive the lower portion of said actuator spring whereby the first position indention is engagable with the slotted opening to position the pawls into engagement with the teeth of said ratchet shaft, and the second position indention is engagable with the slotted opening to position the pawls into disengagement from the teeth of said ratchet shaft,
• said upper base further including an aperture near each side extending horizontally from front to back and interconnected by a pivot pin for retaining each said upper dog, and with the upper flanges further interconnected by an upper axle that is parallel with and outboard from the pivot pins for retaining the up end of said elastic spring.