Stud mounted hoist ring

• US 5,586,801 A
• Filed: 10/27/1994
• Issued: 12/24/1996
• Est. Priority Date: 10/27/1994
• Status: Expired due to Term

• Current Assignee: Northrop Grumman Shipbuilding Incorporated (Huntington Ingalls Industries Incorporated)
• Original Assignee: Newport News Shipbuilding And Dry Dock Company
• Inventors: Wheeler, Douglas M., Sawyer, David R.
• Primary Examiner(s): KRAMER, DEAN J
• Application Number:
  US08/329,929
• Time in Patent Office: 789 Days
• Field of Search: 294/1.1, 294/82.1, 294/8.9, 411/171, 411/400, 403/78, 403/164, 410/101, 410/112-114
• US Class Current: 294/215
• CPC Class Codes: B23K 9/207 Features related to studs welding studs per se B23K35/0288
• CPC Class Codes: B66C 1/66 for engaging holes, recesses, or abutments on articles specially provided for facilitating handling thereof
• CPC Class Codes: Y10T 403/32213 Articulate joint is a swivel
• CPC Class Codes: Y10T 403/32975 Rotatable

Abstract

A stud mounted hoist assembly for lifting, moving, suspending, or loading material and equipment during construction comprises a ring assembly, a welding stud anchor, and a bushing having a chamfered inner cylindrical surface to accommodate weld flash when mounting the assembly to a load or overhead structure. The bushing and ring assembly provide pivot and swivel capability to the mount. One operator can quickly and securely install a temporary lifting point where and when needed without the assistance of support personnel.

Claims

1. A hoist ring assembly for attachment to a load lifting point comprising:

a welding stud having a free end, a threaded shank, and a second end for welding to a load lifting point;

a bushing concentric with said welding stud;

a ring assembly in rotating and swivel engagement with said bushing;

a locking nut threadably engaged on said stud for holding said bushing against said lifting point;

a flat washer disposed on said welding stud between said bushing and said locking nut;

said bushing further comprising a bearing flange at one end for bearing engagement with the load lifting point and a sleeve at the other end, said bearing flange having an outer cylindrical surface and a plurality of inner cylindrical surfaces, said inner cylindrical surfaces being in stepped relationship with each other, said steps being formed by the diameter of one of said inner cylindrical surfaces being larger at an end of said flange in bearing engagement with said load lifting point and the diameter of the other of said inner cylindrical surfaces being smaller at an end of said flange adjacent said sleeve end, and at least said smaller diameter inner cylindrical surface having a chamfer.

2. A hoist ring assembly for attachment to a load lifting point comprising:

a welding stud having a threaded free end and a second end fixably attached to the load lifting point;

a bushing having a longitudinal bore for receiving said welding stud, said bushing having a bearing flange at one end for bearing engagement with the load lifting point and a sleeve at the other end, said bearing flange having an outer cylindrical surface and a plurality of inner cylindrical surfaces, said inner cylindrical surfaces in stepped relationship with each other, said steps being formed by the diameter of one of said inner cylindrical surfaces being larger at an end of said flange in bearing engagement with said load lifting point and the diameter of the other of said inner cylindrical surfaces being smaller at an end of said flange adjacent said sleeve end, at least said smaller diameter inner cylindrical surface having a chamfer;

a ring assembly including a U-shaped ring, an annular collar and pivot pins, said pins extending through bores at the ends of the legs of said U-shaped ring and through bores in said annular collar and being retained therein to render said U-shaped ring pivotable about said pivot pins in an arc of substantially 180 degrees;

a locking nut threadably engaged on said threaded free end of said welding stud;

a flat washer disposed on said welding stud between said bushing and said locking nut to retain said bushing fixed with respect to said load lifting point and said stud;

said ring assembly being pivotable for 360 degrees about said bushing.

3. A hoist ring assembly for attachment to a load lifting point comprising:

a welding stud anchoring means;

a bushing having a longitudinal bore for receiving said welding stud anchoring means;

a ring assembly in rotating and swivel engagement with said bushing;

said welding stud anchoring means comprising a welding stud having a free end, a threaded shank, and a second end for welding to said load lifting point, a locking nut threadably engaged on said stud for holding said bushing against said lifting point, and a flat washer disposed on said welding stud, said washer being held adjacent said bushing by said locking nut;

said bushing further comprising a bearing flange at one end for bearing engagement with the load lifting point and a sleeve at the other end, said bearing flange having an outer cylindrical surface and a plurality of inner cylindrical surfaces, said inner cylindrical surfaces being in stepped relationship with each other, said steps formed by diameters of said inner cylindrical surfaces being larger at an end of said flange in bearing engagement with said load and smaller at an end of said flange adjacent said sleeve end, and at least said smaller diameter inner cylindrical surface having a chamfer.

4. A hoist ring assembly for attachment to a load lifting point comprising:

a welding stud having a threaded free end and a second end fixably attached to the load lifting point;

a bushing having a longitudinal bore for receiving said welding stud, said bushing having a bearing flange at one end for bearing engagement with the load lifting point and a sleeve at the other end, said bearing flange having an outer cylindrical surface and a plurality of inner cylindrical surfaces, said inner cylindrical surfaces in stepped relationship with each other, said steps formed by diameters of said inner cylindrical surfaces being larger at an end of said flange in bearing engagement with said load lifting point and smaller at an end of said flange adjacent said sleeve end, at least said smaller diameter inner cylindrical surface having a chamfer;

a ring assembly having an annular collar with inner and outer side walls, said inner side wall being in rotatable engagement with said sleeve end of said bushing, said side walls having through bores for receiving pivot pin elements;

pivot pin elements in axial alignment, integrally disposed in said side walls of said annular collar;

a substantially arcuate loop having legs at an open end, said legs having through bores at the ends of said legs, said pivot pin elements disposed in said bores of said legs and holding said legs in pivotal engagement with said outer facing side wall of said annular collar;

a locking nut threadably engaged on said threaded free end of said welding stud; and

a flat washer disposed on said welding stud, said washer being held adjacent said sleeve end of said bushing by said locking nut.

5. A hoist ring assembly for attachment to a load lifting point comprising:

a welding stud having a threaded free end and a welding end, said welding end having a smaller diameter than said free end;

a bushing concentric with said welding stud, said bushing comprising a bearing flange at one end for bearing engagement with the load lifting point and a sleeve at the other end, said bearing flange having an outer cylindrical surface, an inner cylindrical surface, and a chamfered inner cylindrical surface at a junction between said sleeve end and said bearing flange of said bushing;

a ring assembly in rotating and swivel engagement with said bushing;

a locking nut threadably engaged on said stud for holding said bushing against said lifting point;

a flat washer disposed on said welding stud between said bushing and said locking nut; and

said welding end of said stud having a length extending from said load lifting point beyond said chamfered inner surface of said bushing when said stud is welded to said load lifting point.

6. A hoist ring assembly for attachment to a load lifting point as in claim 5, wherein, said smaller diameter of said welding end being constant over the full length of said welding end.