Patent ID: 8231509

Claim:
A weight lifting machine for use by a weight lifter, which comprises: (a) a floor frame assembly for placing on a floor and carrying a pair of generally parallel, spaced-apart lower slide bars; (b) a pair of locking moving carriage assemblies, each carriage assembly having a top end and being carried only by said frame assembly lower slide bars, said carriage assemblies being movable front to rear only by said frame assembly lower slide bars during lifting by a weight lifter while said floor frame assembly remains stationary, said carriage assemblies comprising: (i) a pair of spaced-apart vertical slide bars which remain vertical as the carriage assembly moves front to rear, (ii) a weight bar spanning between each vertical slide bar, (iii) a pair of weight bar mount assemblies, each slidably mounted to said frame assembly lower side bars, said weight bar mount assemblies affixed to said weight bar for vertical movement of said weight bar along said carriage assembly slide members, (iv) a pair of vertical weight rack bars carried by said movable carriage and located in spaced-apart adjacency from said weight bar and from said vertical slide bars, (v) an engagement mechanism carried by said weight bar and engagable with said weight rack bar by a weight lifter, and (vi) a rigid overhead frame connector assembly spanning between and connecting said carriage assemblies; said weight bar movable vertically and front to back, and said weight bar and weight rack bars movable together front to back.