Lot #45: Screwjack A - Vintage

Vintage mechanical screw jack, also known as a jackscrew or bottle-type screw jack. This specific design is a manual, non-hydraulic tool often used for lifting heavy loads like vintage automobiles, farm machinery, or even structures. Key Features and Operation Mechanism: It operates by converting rotational motion into linear motion through a central threaded lead screw. Tommy Bar: The long horizontal rod inserted through the top of the jack is a tommy bar (or jack handle). It acts as a lever to provide the mechanical advantage needed to turn the screw and lift heavy weights. Self-Locking: Unlike hydraulic jacks, screw jacks are generally self-locking due to the friction of the threads, meaning they will hold a load in place even without continuous force on the handle. Portability: The side handle is designed for easy transport of the heavy cast iron unit. Category: Tools, Hydraulic Jack, Vintage Tools Fabulous Auction in the The Kingsway with Finds & Treasures. * Please bring help and appropriate vehicle for larger items. * All items will be easily accessed on a ground floor or outside for heavier items to allow for easier pick up. * Subway is close by * Thank you for looking! & bidding! Pickup category timeslot {B}