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Патент USA US3055709

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Sept. 25, 1962
s.- P. LUNDSKOG
3,055,696
LIFT HOOK WITH SELF-OPERATING SAFETY LATCH
Filed Feb. 24, 1960
2 Sheets-Sheet 1
P
2
INVENTOR.
574W P. ZZ/IVDSA/06;
Sept. 25, 1962
s. P. LUNDSKOG
3,055,696
LIFT HOOK WITH SELF-OPERATING SAFETY LATCH
Filed Feb. 24, 1960
2 Sheets-Sheet 2
My
INVENTOR.
ACZ'ORNEY
3,055,696
Patented Sept. 25, 1962
1
2
the position shown in FIGURE 4. Further lowering re
3,055,696
sults in the hook and latch entering the ‘aperture of the
LIFT HOGK WITH SELF-OPERATING
lift
plate. After the aperture of the lift plate has thus
SAFETY LATCH
been engaged the hook and latch drop by gravity so that
ten I’. Lnndskog, (Ietlar Creek Township, Ind, assignor
to United States Steel Corporation, a corporation of 01 the hook is latched and ready to lift the lift plate, as best
shown in FIGURE 5. The projections 20 and 26 pro
New Hersey
vide the weight needed to insure that the hook and latch
Feb. 24, 1960, Ser. No. 10,589
will assume and remain in closed position when suspended,
3 Claims. (Cl. 294-83)
as shown in FIGURES 3 and 5.
The present invention relates generally to lift hooks
To disengage the hook after the lift plate and carrier
have been lowered to the ?oor, the hook is lowered until
the top edge of the lift plate strikes the throats of the
and more particularly has ‘as its primary object to pro
vide a self-operating lift hook and safety latch assembly.
This and other objects will become more apparent after
hook and latch and then follows the cam surface pro
referring to the following speci?cation ‘and attached draw
vided by the projection 18 to spread the hook and latch
ings, in which:
15 to open position, as shown in FIGURE 6. The hook and
FIGURE 1 is a front elevational View;
latch assembly is then moved along the edge of the lift
FIGURE 2 is a side elevational view partly in section;
plate ‘away from the aperture of the lift plate to the posi
FIGURE 3 is a substantially diagrammatic View show
tion shown by broken lines in FIGURE 7 so that the
assembly can be raised free of the lift plate.
Thus, the hook and latch assembly provides an arrange
ing the lift hook of the invention in position preparatory
to engaging a load in the form of a bail;
FIGURE 4 is ‘a view similar to FIGURE 3 showing
the hook in an advanced position preparatory to engaging
ment whereby the hook is automatically closed when in
lifting position so that a load cannot escape from the
the load;
hook.
Further, the unique structure of the hook and
‘FIGURE 5 is a view similar to FIGURE 3 showing the
latch assembly renders it self-openable so that it is not
hook in lifting engagement with a load;
25 necessary to employ a ?oorman for manipulating the hook
FIGURE 6 is ‘a view similar to FIGURE 3 showing the
to engage or disengage from a load. The hook and latch
hook being released from engagement with the load; and
assembly of the invention can be manipulated to en—
FIGURE 7 is an end view of FIGURE ‘6.
gage and disengage by the crane operator alone.
Referring more particularly to the drawing, reference
While one embodiment of my invention has been shown
numeral 2 designates generally the assembly of my in
and described it will be apparent that other adaptations
vention which includes a lift hook 14» having a shank 6,
‘and modi?cations may be made without departing from
load-supporting or saddle portion 8, and a bill Ill. The
the scope of the following claims.
shank 6 is formed with a shoulder 12 adjacent its lower
‘I claim:
end for seating a collar 14. Collar 14- is provided with
1. A self-operating lift hook and safety latch assembly
trunnions 16 projecting from ‘opposite sides thereof for
a purpose which will become apparent. A projection 1%
extends from the hook it immediately below the shoulder
12 and above the bill 10, as best shown in FIGURE 1.
Projection 18 provides a cam surface which is used in the
unlatching operation as will be explained more fully 40
hereinafter. A projection 20 depends from the bottom
of the saddle portion 8.
A pair of hook-shape plates 22 connected together in
spaced relation at their lower ends by a shaft 24 is pivotal
the pair of pivoted hook-shape plates spread apart in
2. A self-operating lift hook and safety latch assembly
comprising a lift hook having a shank, ‘a load-support por
tion and a bill, a pair of hook-shaped plates pivoted to the
shank of said lift hook in opposed relation to said lift
hook, the ‘bill of said hook being normally received be
ly mounted on the trunnions 16 of the collar 14 in op
latch assembly of the invention is lowered onto the top of
the lift plate, and as the assembly is lowered it is cen
tered on the edge of the lift plate by means of the pro
jections 20 and 26 so that the lift plate edge enters the
V notch 28, as shown in FIGURE 3. As the assembly
is lowered further the lift hook and the latch formed by
opposed cam surfaces on said lift hook and on said pair
of plates defining a V notch therebetween.
tween said hook-shaped plates, and opposed cam surfaces
on the lower portions of said lift hook and said pair of
plates normally de?ning a V notch therebetween.
posed relation to the lift hook straddling the bill 10. A
projection 26 ‘depends from the lower portions of each
of the plates 22 which corresponds with the projection 20
on the bottom of the lift hook. The projection 20 and
the projections 26 provide opposed cam surfaces which
de?ne a V notch 28 therebetween when the assembly is
in normal closed position, as best shown in FIGURE 1.
In operation, to engage a lift plate P of a carrier bail
(not shown) or other lift apparatus that presents an ‘aper
ture or slot in which the hook may engage, the hook and
comprising a lift hook, a pair of hook-shaped plates
pivoted to said lift hook in opposed relation thereto, and
3. A self-operating lift hook and safety latch assembly
as de?ned by claim 2 including a cam surface on said lift
hook ‘adjacent the pivot point of said plates, said last
named cam surface projecting between said plates.
References Cited in the ?le of this patent
UNITED STATES PATENTS
5
0
1,860,121
2,426,099
2,476,734
2,645,834
2,958,557
Trout ________________ __ May 24,
Hershowitz ___________ __ Aug. 19,
Jellison ______________ __ July 19,
Morehouse ___________ __ July 21,
‘Cianchette ____________ __ Nov. 1,
1932
1947
1949
1953
1960
FOREIGN PATENTS
63,768
France _______________ __ Apr. 27, 1955
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