Patent GB-190525843-A (GB)
Title: Improvements in or relating to Apparatus for use in Hoisting and Distributing Building and other Material.
Inventor: ABEL NIELS ANDERS HANSEN
Filed: 1905-12-12
Granted: 1907-01-12
Abstract: 25,843. Abel, N. A. H. July 3, [date applied for under Patents Act, 1901]. Cranes.-In a crane or transporter for hoisting and distributing building and other materials of the kind described in Specification No. 25,141, A.D. 1905, means for turning the bridge, shifting the elongation bridge and hoisting and traversing the load carriage along g the bridge and elongation bridge are employed in combination with means for automatically balancing the jib. The crane post is composed of two portions. The lower part consists of curved plates riveted together along the outwardly bent horizontal and vertical flanges. The upper part 2 has internal flanges and rests in and upon the lower part 1 by an external flange 3. The jib or distribution bridge is suspended from a swivelling eye 44 by guys 5, and encircles the post. It is slued by horizontal worms 17 engaging a worm-wheel 22 slidably mounted on the central column and held in position by catches. Revolubly mounted between angle-iron rings 8, 9 is a plate 6 carrying downwardly-depending guides 15 curved in a circle with its centre in the swivelling eye. These guides sit in angle brackets 16 on the jib. The bridge is therefore constrained to partake of the circular motion of the worm-wheel 22, but is permitted a slight swinging movement when the balance is disturbed. When the lower part 1 is being lengthened, the worm-wheel 22 is raised out of gear with the worms 17 and the jib is locked to the upper part 2. The worms then engage worm-wheels 31 integral with vertical screws 30. The screws 30 sit in sleeves or nuts 33 connected towards the lower extremity by a chain 36 and resting by the arms 35 on the external flanges of the lower part 1. On the screws being rotated, the upper part 2 is raised by the projecting arms 32 so that an extra row of plates can be secured to the top of the lower part. The upper part 2 can then be lowered to rest again upon the flange 3. The jib is constituted by two double guides 37, between which slide the guides 40 of the jib extension. The jib extension is supported by guys 42, 43 passing to drums 45. The jib extension is projected by two pairs of ropes 46 secured to its inner end passing, one pair directly, and the other by sheaves 48 at the outer end of the jib, also to the drums 45. The drums 45 are constructed so that on projecting the jib extension the guys 42, 43 are payed out just the requisite amount. The hoisting rope 59 is fixed at one end to the stationary guides 37, aud passes to and from the load sheave on the travelling carriage by sheaves at each end of the jib extension, and thence by other sheaves 64, 65 to a winding-drum 66. One traversing-rope 67 is secured to the carriage and passes round an arrangement of guide-sheaves upon the jib and also round other sheaves, and sheave 75 to the drum 76. The other traversing-rope 77 passes from the other end of the carriage round guidesheaves and sheave 75 also to the drum 76. The arrangement of the ropes is such that no vertical motion of the load takes place during movement of the jib extension or of the carriage. The movable portion of the jib and the load are counterweighted by a trolly 81 running on rails 82 and carrying a segment of a double sheave 84, The chain 85 working the trolly is attached at one end to the sheave 84 and passes by sheaves 86, 87 at each extremity of the hind portion of the bridge back again to this sheave. The axle of the sheave 84 carries four arms 88, two on each side, provided with notches wherein are inserted. bars 89 connected to the weighted levers 91 of brakes acting upon pulleys on the track axles. The arrangement is such that the brakes are automatically released when the chain 85 is put under tension. The moving of the trolly 81 is produced and kept up automatically by a rope passing over sheaves 97, 99. A frame 104 rotating about the axis 100 of the pulley 99 is flexibly connected by a rod 113 with the plate 6. The frame 104 carries a spur-wheel 103 in gear with a spur-wheel 120 integral with the sheave 99 and also a friction wheel 105. Any alteration of the position of the load or of the jib extension on the jib causes relative movement between the plate 6 and the jib, and the frame 104 carries its wheel 105 into contact with one of two friction wheels 106, 107 driven simultaneously in opposite directions from the motor shaft 109, and the motion is communicated in the required direction by the sheave 99 to the movable counterbalance. The motor shaft 109 also carries a conical pulley 117, Fig. 11, connected by a belt to another similar pulley on a shaft 119 carrying four friction sheaves 121 and also a spur-wheel 122 gearing with a spur-wheel 123, carrying on its shaft four other friction sheaves 124. The shaft 79 carrying the drums 66, 76 has mounted upon it four small frames 126 ... 129 carrying friction sheaves 130, each adapted to be brought into gear with one of the corresponding oppositely-rotating friction sheaves 121, 124, according to the direction of motion desired. The first three sheaves actuate the drums 45, 66, 76, while the sheave carried by the frame 129 actuates the screws 17 through chain and bevel gearing carried by links so as to be independent of the position of the bridge. The frames 126 ... 129 are rocked by levers 148 through links 147, connected by two cranks on a shaft 145 to links 143 directly connected to the swinging frames. The sheave 130 of the hoisting-drum is normally braked by a weighted lever 151 which is raised and the brake removed by a two-armed lever 153 when the corresponding lever 148 is moved from its mid or 'off' position.