B - Operations – Transporting – 05 – B
Patent
B - Operations, Transporting
05
B
32/22.5
B05B 1/06 (2006.01) B05B 1/28 (2006.01)
Patent
CA 1141531
APPARATUS FOR SPRAYING POWDER CIRCUMFERENTIALLY AROUND A PIPE JOINT Abstract of the Disclosure Apparatus for spraying a powder circumferentially around a pipe joint on a pipe comprising a yoke engagable with the pipe, one or more powder dispensers mounted on the yoke and disposed over the pipe joint, means for driving the yoke circumferentially about the pipe, each powder dispenser having an inner housing provided with an opening positioned adjacent the surface of thepipe for supplying a quantity of air-powder suspension to the surface of the pipe over the pipe joint, each powder dispensing device also having an outer housing surrounding the inner housing and being provided with an opening positioned adjacent the pipe and surrounding the opening of the inner housing, the inner and outer housings of each powder dispenser defining a space therebetween. A powder suspension device is provided having a hollow container adapted to contain a quantity of powder therein and a means for introducing air under pressure adjacent the bottom of the container to place the powder in suspension in the container. A blower is also provided having an inlet and a tangential outlet from which a stream of air emerges. A powder return housing is located beneath the blower and above the powder suspension device and in communication with both of these devices. A pair of tangential inlet pipes arranged approximately 180° apart on the return housing are adapted to return excess powder from the powder dispensing devices. A pair of Venturis having their suction inlets connected to the side of the powder suspension device are connected to streams of air for withdrawing quantities of powder suspension from the container and for introducing the powder suspension into the tangential outlet from the blower. A pair of pipes or hoses connect from the tangential outlet of the blower with the inner housings of the two powder dispensers for supplying a stream of air-powder suspension to the powder dispensing devices, and a second pair of hoses or pipes connect from the spaces between the inner and outer housings of the two dispensers with the two tangential inlet pipes on the return housing. The Venturis are connected so thattheir outlets go into the two pipes or hoses leading from the tangential outlet from the blower to the two inner housings on the powder dispensers.
362380
Hart Robert J.
Langley Russell M.
Commercial Resins Company
Gowling Lafleur Henderson Llp
LandOfFree
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