Prop head bearing
US7201541B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 29, 2005 |
| Grant date | Apr 10, 2007 |
| Priority date | — |
| Expiry date | Nov 16, 2025 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D23/049
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.