Abstract: A settling basin of a wastewater treatment system includes a collector chain including chain links having a plurality of side bars, stepped connecting pins configured to join the plurality of side bars and including a first end including a head portion having a cross-sectional area larger than portions of the plurality of side bars through which the stepped connecting pin extends, end caps configured to receive second ends of the stepped connecting pins, and apertures defined in the end caps and second ends of the stepped connecting pins configured to receive a retaining element that holds the end caps in position on the second ends of the stepped connecting pins.

Abstract: A settling basin of a wastewater treatment system includes a collector chain including chain links having a plurality of side bars, stepped connecting pins configured to join the plurality of side bars and including a first end including a head portion having a cross-sectional area larger than portions of the plurality of side bars through which the stepped connecting pin extends, end caps configured to receive second ends of the stepped connecting pins, and apertures defined in the end caps and second ends of the stepped connecting pins configured to receive a retaining element that holds the end caps in position on the second ends of the stepped connecting pins.

Abstract: Disclosed herein is an elastomeric coupling for transmitting torque between two shafts approximately aligned on a shaft axis, which coupling comprises a composite member including an elastomeric center element, and a shoe fabricated from a reinforced plastic material and including a first portion bonded to the center element, and a second portion extending axially from the first portion and from the center element, including apertured metallic inserts, and being adapted to be connected to one of the shafts.

Abstract: Disclosed herein is an elastomeric coupling for transmitting torque between two shafts approximately aligned on a shaft axis, the coupling comprising a composite arcuately extending member including a shoe having a first portion and a second portion extending from the first portion and adapted to be connected to one of the shafts, and an elastomeric center element having, in a radial plane extending from and along the shaft axis, an inwardly opening generally U-shaped cross-section defined by two axially spaced radially extending leg portions respectively including an inner part bonded to the first portion of the shoe, and an outer part, and an axially extending bridge portion connected to the outer parts and including a weakened area which is located remotely from the shaft axis and which facilitates tearing of the bridge portion at the area in response to excessive transmission of force as compared to tearing of the bridge portion at other areas.