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1. (WO1989000249) LOCKABLE, PIN-RETAINING COUPLING
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

CLAIMS;
1. A coupling comprising a pin, a clevis, said
clevis having first and second legs, each of said legs having a bore therethrough, said bores being coaxial 5. and having cylindrical surfaces, said bores being
adapted to slidably receive said pin, said pin having
first and second ends and first and second stops at
said respective ends, said pin having a cylindrical
suface, said second leg having a latch, said latch 10. holding said pin in position within said bores of said first and second legs when said latch is engaged with
said pin, said pin being retractable from said bore of said second leg when said latch is not engaged with
said pin, a brake, said brake restricting movement of 15. said pin within said pin bores, said brake restricting movement of said pin within said pin bores, said stops preventing said pin from being retractable from said
bore of said first leg.
2. The coupling of Claim 1 wherein said latch 20. comprises a latch body having outer and inner surfaces, upper and lower projecting tracks, and an overhang,
said inner surface having a slot therein, said slot
comprising an open, circular first end, an undercut
longitudinal central portion, and an undercut
25. disk-shaped second end, said overhang being defined by the region between said inner surface and the surface
of said undercut portions of said slot, upper and lower transverse channel slots positioned within said second leg, said projecting tracks slidably positioned within 30. said channel slots, said latch body being slidable
within said second leg, said overhang engaging said
second pin end when said latch body is in the latched
position thereby preventing said pin from being retracted from said second end, said overhang
disengaging said second pin end when said latch body is in the unlatched position thereby allowing said pin to be retracted from said second leg.
5. 3. The coupling of Claim 1 wherein said second
stop includes a groove, a ramp, and a head.
4. The coupling of Claim 3 wherein said ramp
comprises a base and an incline, said head and groove
define a shoulder, said shoulder plunges from said

10. cylindrical pin surface to said base of said ramp, said incline angles away from said base and head and crests at said cylindrical surface of said pin, said base
forms a neck about said pin.
5. The coupling of Claim 4 wherein said coupling 15. has a retainer comprising said shoulder, a disk-shaped collar receptacle within said first leg bore; said
collar receptacle having spaced walls and a face
disposed between said walls, a collar within said
receptacle and pin groove, said pin shoulder and facing 20. receptacle wall wedging said collar therebetween when
said pin is retracted to the fully open position
thereby retaining said pin within said first leg.
6. The coupling of Claim 4 wherein said collar
surrounds said base when said pin is in the fully
25. retracted position; and said ramp stretches said collar outwardly to said clyindirσal pin surface when said pin is urged in the direction of the closed position and
said walls restrain said collar from movement relative to said first leg.
30. 7. The coupling of Claim 4 wherein said collar is toroidal in shape, and said collar is diametrically
expansible in tension.
8. The coupling of Claim 7 wherein said collar is a coil.
9. The coupling of Claim 5 wherein the radial
distance from said cylindrical bore surface to said
receptacle face is equal to or greater than the
5. diameter of said axial collar thickness, and the radial distance from said pin surface to said base of said
ramp is from about one-quarter to about three-quarters said axial collar thickness.
10. The coupling of Claim 2 wherein said latch and 10. said second leg has a detent, said detent allowing said latch to travel slidably from said latched position to said unlatched position, said detent holding said latch body within said second leg.
11. The coupling of Claim 2 wherein said latch 15. body has a hole therein, and said pin has a spring
biased rod in said second end of said pin, said spring biased rod occupying said hole of said latch when said latch body is in the latched position, thereby
preventing movement of said latch body to the unlatched 20. position; said spring biased rod being removable from
said hole thereby allowing movement of said latch body
to the unlatched position.
12. The coupling of Claim 2 wherein said latch
body is spring biased into the latched position.
25. 13. The coupling of Claim 1 wherein said first
stop is an enlarged first end, said enlarged first end
being larger than said bore.
14. The coupling of Claim 1 wherein said brake
comprises a collar, a disk-shaped collar receptacle

30. having spaced walls and a cylindrical face extending
between said walls, said cylindrical pin surface, said
collar being retained in said receptacle, whereby
friction restricts sliding movement between said collar and pin and said collar and receptacle walls thereby
restraining movement of said pin through said bore.
15. The coupling of Claim 1, said pin having a
mass, said brake restraining movement of said pin in an

5. amount to overcome the force of gravity acting upon
said pin thereby preventing movement of said pin within said bore.
16. A coupling comprising a clevis having a bore
extending therethrough, a pin slidably engaged within

10. said bore, means for frictionally restraining movement of said pin relative to said bore, and means for
preventing said pin from being removed from said bore.
17. A coupling comprising a clevis having a bore
extending therethrough, a pin slidably engaged within

15. said bore, a brake between said pin and said clevis,
said brake restraining movement of said pin within said bores, said pin having opposite ends, each of said
opposite ends having a stop thereby preventing said pin from being removed from said bore.