초록 ▼

A swivel fitting is provided for use on a riser line associated with the underground storage tank of gasoline service stations. The swivel fitting includes an adapter sleeve that attaches to the riser line and a swivel sleeve with a quick release fitting for use in removably attaching a product tran

A swivel fitting is provided for use on a riser line associated with the underground storage tank of gasoline service stations. The swivel fitting includes an adapter sleeve that attaches to the riser line and a swivel sleeve with a quick release fitting for use in removably attaching a product transfer hose as is typically used to transfer product to the underground storage tank from a tanker truck. The adapter and swivel sleeves are rotatably coupled by a plurality of ball bearings to permit smooth rotation of the quick release fitting with respect to the riser line.

대표청구항 ▼

[ What is claimed is:] [1.]1. A swivel fitting for engaging a pipe, comprising:an adapter sleeve having an external surface of revolution that is concentrically disposed about a first axis, having an external annular groove;a swivel sleeve that is rotationally movable with respect to the adapter sle

[ What is claimed is:] [1.]1. A swivel fitting for engaging a pipe, comprising:an adapter sleeve having an external surface of revolution that is concentrically disposed about a first axis, having an external annular groove;a swivel sleeve that is rotationally movable with respect to the adapter sleeve during use, the swivel sleeve having an internal surface of revolution that is concentrically disposed about a second axis that is coincident with said first axis, the internal surface of revolution having a diameter that is slightly greater than the diameter of the external surface of revolution, the external surface being at least partially fitted within the internal surface, and having an internal annular groove that is in axial alignment with the external annular groove to form a channel, the swivel sleeve defining a first tangential opening in communication with the channel;a plurality of ball bearings located in the channel formed by the alignment of the internal and external annular grooves to permit free rotation between the adapter sleeve and the swivel sleeve, wherein the first tangential opening is of a diameter slightly larger than the ball bearings to permit the insertion and removal of the ball bearings to and from the channel;a second opening in the swivel sleeve proximate to the first tangential opening;wherein the first tangential opening and the second opening bound a majority portion and a minority portion of the channel, further comprising a key occupying the minority portion of the channel such that bearings may not enter or occupy the minority portion of the channel;wherein the second opening is of insufficient size to allow passage of a ball bearing; anda removable plug for closing the first tangential opening without extending into the bearing channel to prevent the ball bearings from exiting the bearing channel.