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Pin retention system
| Details |
Inventors: Peterson, Louis G.;
Assignee: G.E.T. Australia Pty Ltd. (Queensland, AU)
Primary Examiner: Knight; Anthony
Assistant Examiner:
Attorney, Agent or Firm: Lowe, Price, LeBlanc & Becker
A releasable connecting pin for a shackle or the like comprises a pin (45) having a cylindrical body (46) with a head (47) at one end and a boss (48) at the other end. The boss comprises a cylindrical neck (49) and spaced radially extending projections (50a, 50b, 50c) in the form of a male coupling element. A female coupling element comprises apertured flange plates (51, 52) having apertures (53) of a shape complementary to the cross sectional shape of the boss (48) through the projections (50a, 50b, 50c) to permit the flange plates (51, 52) to slide over the boss (48). One flange plate (51) is rotatable about the neck (49) to misalign the boss projections (50a, 50b, 50c) with corresponding notches in the aperture (53) to engage the flange plate (51) behind the boss (48). Set screws 58 extend through aligned apertures (54, 55) in the flange plates (51, 52) to prevent relative rotation and disengagement from the boss (48). |
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DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS In FIG.
1, the coupling pin comprises a generally cylindrical body portion 1, an enlarged head portion 2, a necked portion 3 and a shaped end portion 4 comprising three radially extending projections 5a, 5b, 5c as shown in FIG.
2.
Each of projections 5a, 5b, 5c is of a different size.
As seen in FIGS.
2, projections 5a, 5b and 5c are circumferentially equally spaced.
FIG.
3 shows a top plan view of the coupling pin of FIG.
1 wherein the head portion 2 is of a rectangular configuration.
FIG.
4 shows a retention means in the form of an apertured plate 6 comprising a generally circular central portion 7 having radially extending regions 8a, 8b and 8c corresponding in size and shape to projections 5a, 5b and 5c respectively.
When apertures 8a, 8b and 8c respectively are aligned with projections 5a, 5b and 5c, plate 6 is a neat sliding fit over shaped boss 4 of the pin.
FIGS.
5 and 6 show a pair of plates 6 engaged over the boss 4 of pin 1 with the regions 8a, 8b, 8c of lower plate 6 aligned with corresponding projections 5a, 5b and 5c of the pin.
The upper plate 6 is rotated through 45.
degree.
relative to lower plate 6 to misalign the respective regions 8a, 8b and 8c relative to projections 5a, 5b and 5c.
It will be readily apparent that when either or both of upper and lower plates 6 is rotated or otherwise moved such that respective aperture regions 8a, 8b and 8c are misaligned with projections 5a, 5b and 5c, the coupling pin may be securely retained in the coupling cheeks or clevises of say, a dragline bucket, crane boom couplings or pivot points etc.
Moreover as in most cases, the coupling pins are utilized in a horizontal position, the necked region 3 of the pin allows the retaining plates 6 to be displaced laterally relative to their axially aligned engagement/disengagement position.
With a rectangular pin head 2, the pin can, in use, be constrained against rotation to minimise the risk of disengagement between retaining plates 5 and the projections on the boss 4 of the pin
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MEMS 
