Patent GB-860998-A (GB)
Title: Improvements in or relating to conveyor systems
Inventor: BURROWS ARTHUR THOMAS CHARLES
IPC: B61B10/04
Filed: 1958-03-21
Abstract: 860,998. Floor - truck haulage systems. KING Ltd., G. W. March 19, 1959 [March 21, 1958], No. 9172/58. Class 104 (2). In a system in which two conveyers, comprising load-carrying trolleys 10, 11 towed over a floor by a bolt 15 depending therefrom into engagement with abutments 16 provided on an endless chain 14 travelling in a channel below the floor level, are arranged so that the discharge end of one conveyer 36, 37 or 38, Fig. 4, is disposed adjacent the travel path of the second, 42, a thruster device 45 is provided for transferring load trolleys from towed relationship with the first chains 36, 37 or 38 into towed relationship with second 42 and is disposed adjacent the discharge end of the first chain and operative as a load trolley approaches such end to engage the bolt 15 and positively to push the same into the line of travel of the second chain 42 a ramp 46, Fig. 5, being provided to cause the bolt 15 engaged by the thruster device 45 to ride upwards, during the transfer operation, into a position in which the bolt 15 is lifted clear of and will not foul any passing abutment 16 on the second chain 42, the arrangement being such that when the bolt 15 is correctly disposed relative to the second chain 42 it will drop into a position in which it will be engaged by an abutment 16 on the second chain 42. In the arrangement shown in Fig. 4, in which the driving chains 36, 37, 38 and 42 of conveyers A, B, C and D are arranged below floor level and the bolt 15 on the trolley 10 projects through a slot 43 in the floor into engagement with the driving abutment 16 the thrusters 45 are arranged below floor level but above the level of the abutment 16 so that they can engage the lower portion of the bolt 15 on leaving the driving chains 36, 37 or 38 and push the bolts 15 along the angular portion of the slot 43 into engagement with the slot above the chain 42 whereat the driving abutments 16 will engage the bolts 15 to take up the drive. The thrusters 45 may be electrically, pneumatically, hydraulically or manually operated. In this embodiment endless chain feeder conveyers E, F and G are aligned with the endless conveyer chains 36, 37 and 38 and thrusters 47 are provided at the junction of each pair of endless chains to effect the positive transfer of trolleys from one chain to the next. A spring-loaded finger 48 provided at the end of the ram of each thruster 47 is pushed forward by a bolt 15 of the trolley at its approach to the end of one of the conveyers E, F or G and, once the bolt has passed the finger 48, the finger 48 snaps back to its initial position behind the bolt. The ram of the thruster 47 is now operated to pull the bolt and hence the trolley forward to a position where the bolt will be engaged and the drive taken up by the appropriate chain 36, 37 or 38. Ramps 46 are placed in the channels leading from the chains 36, 37 and 38 to the chain 42 to lift the bolt 17, Fig. 5, as it is moved forwardly by the thruster 45 to prevent the bolt 17 jamming against the sides of the driving dogs on the chain 42. The thrusters 45 may be arranged to operate so as to transfer load trolleys from several feed conveyers to the transverse conveyer or conveyers in a preselected order and/or in preselected numbers or batches. The forward and trailing end faces of the driving dogs 16, Fig. 1, are chamfered so as to enable the bolt 15 to be lifted until it moves into driving engagement between the abutments 16. The front and rear walls of the abutment 16, Fig. 6 (not shown) defining the driving pocket may be curved or " V "-shaped. In the arrangement shown in Figs. 2 and 3 the bolt comprises a lower portion 17 carrying a transverse bar 18 and arranged to be axially slidable in a bracket 19 attached to the front end of a trolley. The portion 17 is fixed to a sleeve 20 slidably supported in a bracket 22 and carrying a pair of laterally-projecting rollers 21. An upper rod portion 23 projects into the sleeve 20 and carries at its lower end a transverse bolt 24 slidably engaged in diametrically-opposed slots 25 in the sleeve 20. The upper end of the rod portion 23 is cranked at 27. In the operative position shown in Fig. 3 the crank portion 27 is engaged beneath a catch 30 and the portion 17 is pressed downwards by a spring 26 into driving engagement with the abutment 16. The spring 26 permits slight upward movement of the portion 17 as the portion 17 passes over the ramp 46 or when a buffer-plate 34 is depressed on meeting an obstruction to move the sleeve 20 upwards, by means of the rollers 21 and arms 35 to lift the portion 17 out of its driving engagement with the abutments 16. Upon withdrawal of the catch 30 the arm 27 is slid upwards along a slot 28 and then turned through 90 degrees and thereafter moved upwards along a slot 31 until it reaches the upper end, whereafter it is turned back through 90 degrees and located in a groove 32 to be held in the inoperative position. The first movement through 90 degrees of the crank arm 27 enables the transverse bar 18 to be aligned with the slot in the floor and then passed upwardly therethrough. The trolley may be held on feed conveyers A, B, or C by movable stops contacting the buffer-plate 34 and subsequent trolleys will also be stopped on engagement with the preceding trolleys by their buffer-plates 34. The buffer-plates 34 may be replaced by pivoted levers provided on the underside of the trolleys and which co-operate with movable stops disposed along the conveyer path. With such an arrangement each trolley may be provided at its rear end with one or a pair of freely-rotatable rollers located at the same level as the stops and which co-operate with the lever on the succeeding trolley to stop such trolleys. The stops may be actuated electrically, pneumatically, hydraulically or manually.