This invention relates to power and free accumulation conveyors in which an element of the power conveyor when it overtakes an unrestrained halted element of the free conveyor automatically connects for movement with said free element and also releases said free element when said free element contacts a stop placed in its path or another free element which has been stopped in its path, for example, in an accumulation area. The driving dog, which is mounted on the power element, is pivotable abou...

A cart structure is provided for dragline systems of the sort now commonly employed for material handling in freight terminals and industrial warehouses. The cart structure features an improved arrangement for related mounting of the dragline engaging drop pin and the switch actuating probe or probes, by which the latter may be lowered and latched in position for switch actuation whenever the drop pin has been lowered for dragline engagement, but are released to an upward retracted position and ...

The system has over and under propelling member and trolley tracks of constant spacing. The propelling member has a depending driving arm for engaging the trolleys and a normally retracted pivoted, ramp actuated, pusher arm for effecting final discharge of the trolleys where the tracks pass through a switch point. The same ramping system may be used to effect a positive propelling member to trolley lock of one or both arms where the system incorporates a vertical incline. The ramps may be retrac...

A duplex chain conveyor system for conveying articles along a conveyance path is provided. The duplex chain conveyor system includes a trolley device which is detachably engageable with a driven engagement member attached to a driving chain which moves within a power rail. When the trolley device is coupled with the driven engagement member, the trolley device is pulled forward on the free rail disposed along a predetermined conveyance path. An article carrier, such as a truck or hanger, is conn...

An improved truck for tow line use is provided with a brake system designed to stop the truck in response to engagement of a front bumper against an obstacle, while minimizing the force applied by the truck and bumper to the obstacle. The truck includes a brake member having a bottom floor-engageable surface and an upper wheel-engageable surface. A longitudinally movable brake support member on the truck supports the brake member in front of at least one wheel for relative movement between a ret...

A power and free conveyor system has trolleys which are mounted on a free track for driving when engaged by pushers on a continuously running power chain. On each trolley, a pusher pawl, lost motion link, and bellcrank lever are interconnected to hold the pusher pawl erect for engagement by a pusher when the lever is in a normal position. When the lever is pivoted by engagement with a preceding trolley, the pusher pawl can collapse. The lost motion link also permits collapse of the pusher pawl o...

A releasing device and dog member for a power and free type of conveyor is described. The releasing device includes a rod (105, 205) which is linearly moveable upon engaging a stop or a truck (17) with a buttress plate (105a, 205a) on the rod to disengage a retaining plate (100a, 200a) on a pivotal dog (100, 200), thereby allowing the dog to pivot away from a pusher member (12). An extending device, such as spring (108) or camming member (209), urges the rod to an extended position when the stop...

A conveyor system comprising a conveyor track, a conveyor movable along said track, a free track and a plurality of carriers movable along the free track. The conveyor has longitudinally spaced pusher and holdback dogs mounted thereon. Each carrier comprises spaced trolleys, and tie bar means interconnecting the trolleys. A trailing trolley has a pusher movably mounted thereon for movement into and out of the path of the pusher and holdback dogs. A bumper is mounted on the carrier at the front e...

A conveyor system comprising a conveyor track, a conveyor movable along said track, a free track and a plurality of carriers movable along the free track. The conveyor has longitudinally spaced pusher and holdback dogs mounted thereon. Each carrier comprises spaced trolleys and a tie bar interconnecting the trolleys. A trailing trolley has a pusher movably mounted thereon for movement into and out of the path of the pusher and holdback dogs. A bumper is mounted on the carrier at the front end th...

A power and free conveyor includes a number of upwardly and downwardly pivotable pushers attached at a specified spacing to a drive chain on a power line, dogs mounted on a number of carriers on a free line and engageable with the pushers, and pusher raising cams mounted on the carriers and each provided at its rear end with a recess for accommodating the dog. When a preceding carrier is brought to a halt, the pusher propelling a following carrier in engagement with the dog of the carrier is rai...