Patent ID: 7380770

Claim:
A hoist device comprises: a gear assembly which includes a chain wheel sandwiched between a first plate and a second plate, said second plate having a number of parallel supporting rods around said chain wheel running perpendicularly through said first plate, a number of indentations conforming to shape of a chain are provided around a circumference of said chain wheel thereby pulling said chain surrounding said chain wheel when said chain wheel turns, a first one of said supporting rods running through a shackle sandwiched between said first and second plates for hanging said hoist device, two fan-shaped chain guiding blocks are provided for aligning and driving said chain on two opposing second and third ones of said supporting rods, respectively, together with an elongated chain stopping block provided on a fourth one of said supporting rods, all interfacing with said chain wheel at a circumference, said chain guiding and stopping blocks being located between said first and second plates, said chain wheel having a tubular end that penetrates through said first plate into a center of a main gear located outside said first plate, said main gear being engaged by a pair of passive gears which in turn are engaged by a driving gear at a first end of a main axle, said main axle rotatably running through said main gear and said chain wheel, and extends outside said second plate for a distance; and a ratchet braking assembly located outside of said second plate and including a base disc, a first brake ring, a ratchet wheel, a second brake ring, and a cap disc starting from said second plate outward, two opposing stopping blocks engaging teeth of said ratchet wheel thereby limiting said ratchet wheel to turn in one direction only, said ratchet braking assembly preventing a lifted object from falling or slipping with friction of said brake rings, said stopping blocks being mounted on two sticks extended perpendicularly from outside of said second plate respectively; said main axle penetrating through said ratchet braking assembly and having a second end provided with threads and grooves for interfacing with said cap disc and for fastening to a nut, and a hexagonal cylinder provided on an outside of said cap disc and plugging into a first end of a hexagonal cylindrical sleeve, a second end of said sleeve providing an axial rectangular socket; whereby when a hexagonal wrench or a power tool is used to drive said sleeve to turn said main axle, said chain wheel will be turned as well so as to pull said chain, and said cap disc closes in to press said ratchet wheel and said brake rings against said base disc, and friction therebetween will cause said ratchet wheel to turn as well; when driving to said main axle stops, friction exerted by said brake rings and effect of said stopping blocks will hold lifted object in place; when desired to lower said object, a wrench or power tool is used to turn said main axle in an opposite direction, said cap disc is moved away from said ratchet wheel and said brake rings.