Flexible duct joint having a low leakage, pressure-balanced bellows seal
Patent 5697651 Issued on December 16, 1997. Estimated Expiration Date: 
March 2, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 2, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3357723 3799586 3869151 Flexible joint for conduit Flexible piping joint Multiple convolution sealing ring Flexible ball joint Automatic lock slider for slide fasteners Flexible joint for conduit Gimbal joint for piping systems InventorAssigneeApplicationNo. 398211 filed on 03/02/1995US Classes:285/94, WITH LUBRICATION285/263, Radially spaced spherical surfaces285/900, BALANCED PRESSURE285/917METALLIC SEALSExaminersPrimary: Arola, Dave W.Attorney, Agent or FirmForeign Patent References
International ClassF16L 007/00AbstractDisclosed is a flexible joint for sealing two conduits. One half of the joint includes an annular seal gland with an outer surface defining a static seal face. The other half of the joint includes an inner race member having inner and outer bearing surfaces, the inner surface spaced apart from and generally opposing the outer surface of the seal gland and having a region defining a dynamic seal face. An annular bellows constructed of a plurality of convolutions having varying convolution heights is disposed between the first and second seal faces to form a low leakage seal. The heights of the convolutions decrease in the direction of the first to the second seal faces. | |
