초록 ▼

A pivotal hitch assembly (14) includes a housing (22) that is pivotally coupled to mounting plates (57) and (58) that are rigidly attached to a draw bar (60) of a trailer. The housing includes a pair of connector tubes (56) that receive pins (63), (64) that couple the housing (22) to the mounting pl

A pivotal hitch assembly (14) includes a housing (22) that is pivotally coupled to mounting plates (57) and (58) that are rigidly attached to a draw bar (60) of a trailer. The housing includes a pair of connector tubes (56) that receive pins (63), (64) that couple the housing (22) to the mounting plates (57), (58). The housing (22) is manufactured from a single blank of material. The connector tubes (56) are formed by bending or rolling a portion of the blank into a generally tubular shape. Bending or folding of the blank forms the housing such that the housing is generally U-shaped.

대표청구항 ▼

A pivotal hitch assembly (14) includes a housing (22) that is pivotally coupled to mounting plates (57) and (58) that are rigidly attached to a draw bar (60) of a trailer. The housing includes a pair of connector tubes (56) that receive pins (63), (64) that couple the housing (22) to the mounting pl

A pivotal hitch assembly (14) includes a housing (22) that is pivotally coupled to mounting plates (57) and (58) that are rigidly attached to a draw bar (60) of a trailer. The housing includes a pair of connector tubes (56) that receive pins (63), (64) that couple the housing (22) to the mounting plates (57), (58). The housing (22) is manufactured from a single blank of material. The connector tubes (56) are formed by bending or rolling a portion of the blank into a generally tubular shape. Bending or folding of the blank forms the housing such that the housing is generally U-shaped. ing of Oil Shale In the Piceance Creek Basin of Northwestern Colorado; Dougan et al Quarterly of the Colorado Scholl of Mines, pp. 57-72. Retoring Oil Shale Underground-Problems & Possibilities; B.F. Grant, Qtly of Colorado School of Mines, pp 39-46. Molecular Mechanism of Oil Shale Pyrolysis in Nitrogen and Hydrogen Atmospheres, Hershkowitz et al.; Geochemistry and Chemistry of Oil Shales, American Chemical Society, May 1983 pp. 301-316. The Characteristics of a Low Temperature in Situ Shale Oil; George Richard Hill & Paul Dougan, Quarterly of the Colorado School of Mines, 1967; pp. 75-90. Direct Production Of A Low Pour Point High Gravity Shale Oil; Hill et al., I & EC Product Research and Development, 6(1), Mar. 1967; pp. 52-59. Refining Of Swedish Shale Oil, L. Lundquist, pp. 621-627. The Benefits of In Situ Upgrading Reactions to the Integrated Operations of the Orinoco Heavy-oil Fields a