Prop head bearing

Details Prop head bearing Prop head bearing

2007-04-10

2007-04-10

Lagman, Frederick L. (Department: 3673)

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

C405S290000, C405S291000, C405S288000, C299S033000, C248S288510

Reexamination Certificate

active

11192906

ABSTRACT:
A prop head bearing between the roof bar and the prop (4) of a shield-type support frame, comprising a ball-joint socket (3) on the roof bar and open towards the prop for receiving a ball-joint head (2) on the prop (4), with at least one movable securing element (6, 7) which, when in a secured position, engages in a recess (12, 13) in the joint head (2) to prevent accidental lifting of the joint head (2) out of the socket (3), and with a bolt which locks the securing element (6, 7) in the secured position, in which that the securing element is in the form of a securing pin (6, 7) movable along its longitudinal axis between the secured position and an assembly position, wherein the securing pin (6, 7) is lockable by the bolt (14, 19) in the assembly position, in which it does not engage in the recess (12, 13) in the joint head (2).

REFERENCES:
patent: 2474464 (1949-06-01), Cable
patent: 3425656 (1969-02-01), Bore
patent: 4004771 (1977-01-01), Plevak et al.
patent: 4457212 (1984-07-01), Unger et al.
patent: 36 40 008 (1988-05-01), None
patent: 42 14 690 (1993-11-01), None
patent: 20 2004 015 149 (2004-12-01), None
patent: 1104428 (1965-03-01), None
Search Report dated Sep. 1, 2005 from the British Patent Office.

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