Abstract An overhead travelling crane comprises a hoist suspended from a girder which travels on two parallel I-rails which are perpendicular to the girder. The girder is suspended from each rail by a carriage which consists of a pair of parallel bars, parallel to, below, and on opposite sides of the rails. These bars are connected at their centers by a shaft and at each end by links pivotally connected to each bar so as to permit limited relative motion between the bars. Each bar supports at each end a roller which rides on the lower flange of the rail. The bars form part of triangular frames which caN swing slightly in a horizontal plane relative to the girder. The object of the arrangement is to permit the suspension system for the girder to accommodate itself to unevennesses of the rails.
A carriage for supporting a travelling girder from a guide rail having two oppositely projecting flanges, said carriage comprising: a pair of bars parallel to, and on opposite sides of said rail, longitudinally spaced means on each bar carrying rollers positioned to ride on said flanges, shaft means pivotally connecting the central portions of said bars, link meaNs positioned near each end of said bars and pivotally connected to each of said bars to permit at least one of said bars to swing relative to the other in a vertical plane about said shaft while preventing horizontal separation of said bars, and a spindle extending through said shaft means parallel to said bars and by means of which said girder is pivotally supported from the central portions of said bars.
Claim 2
Dependent Claim
130 words
A carriage for supporting a travelling girder from a guide rail having two oppositely projecting flanges, said carriage comprising: a pair of bars parallel to, and on opposite sides of said rail, longitudinally spaced means on each bar carrying rollers positioned to ride on said flanges, shaft means pivotally connecting the central portions of said bars, link meaNs positioned near each end of said bars and pivotally connected to each of said bars to permit at least one of said bars to swing relative to the other in a vertical plane about said shaft while preventing horizontal separation of said bars, and a spindle extending through said shaft means parallel to said bars and by means of which said girder is pivotally supported from the central portions of said bars.
Claim 3
Dependent Claim
33 words
A carriage as claimed in claim 1 in which said spindle is mounted in said shaft and on said girder to permit relative movement between said shaft and girder laterally of said spindle.
Claim 4
Dependent Claim
34 words
A carriage as claimed in claim 1 which each bar forms one side of a generally horizontal triangular frame, the corner of which frame remote from said bar is loosely connected to said girder.
Claim 5
Dependent Claim
16 words
A travelling crane comprising a girder supported by two spaced carriages as claimed in claim 1.
Claim 6
Dependent Claim
30 words
A travelling crane as claimed in claim 4 comprising a motor carried by said girder and transmission means through which said motor drives at least one roller in each carriage.