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Патент USA US2283354

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May 19, 1942;
Filed Aug. 15, 1941
R. D a 12 eill
Patented May .19, 1942
U i
_ 2,283,354
Richard‘ Dalzell, Seattle, Washsassignor of one
' half toAd'olph 0. Stixru'd, Seattle, Wash.
Application‘ August ‘15, .1941, Serial No. 407,079
5 Claims.
(Cl. lid-68) ‘
This invention relates to safety alarms, and
particularly to alarms to warn against overload
ing hoisting apparatus.
In the use of hoisting cables, derricks', cranes,
etc., by which heavy loads‘are raised or moved,
as in metal shops, lumber yards, and vlogging ‘
operations in the woods, accidents and‘ injuries
sometimes occur to‘workmen, occasioned by the
sudden breaking of ‘some of. theparts, whenv at—
tempts are unintentionally made tolift greater .
loads than those for which the parts were de'-, ,
enlarged detail view of the ?ring pin, and latch
for retaining the pin in set position, with a trige
ger- bar for dislodging the ?ring 'pin, taken on
line 6-6 of Figure 7. Figure 71s a cross section
view taken on line 1—'I of Figure 6, showing the
.top of the latch, and a shoulder thereon against
which the lower tapered end of the trigger bar.
operates for withdrawing the latch from the ?r
ing pin, when the bar is vdepressed by’a load on
thehook. Figure 8' is a viewof an alternate
form of a member for attaching a load, provid
ing an eye instead of a hook.
I »
Like numerals on the different figures represent
It is therefore important to provideasignal
like parts. Numera1 l0 represents a hook mem
to be operated, when excessive loads are con
nected to the hoisting cables or lifting parts, and 15 ber for attachment to, loads to be raised, and to
to be operated before the breaking pointlhas ‘
be operated from the cable I l, on which power is
been reached. In 'noisyshops and-places, and
applied. The hook is suspended from a hous
at distances in the woods, it has been found that
an explosive sound is the most effective, no ex
cessive and mental attention need be paid to‘ the
usual work of hoisting, because the sharp report
ing’ l2, which in turn is provided with side
of an explosion as from a revolver blank car
tridge, will be heard over the other noises inlthe
shackles 13, connected by pivots M and i5 for
pivotal operation with the cable. The housing is
preferably divided into a support chamber l6,
‘and a signal chamber IT. A flange 18 in the
base of the chamber l6, sustains a relatively
heavy coil load spring l9. The hook is provided
shops and at long distances in the woods, and
give the necessary notice of danger; which may 25 .with a shank 20 which'is extended up through
the spring and carries a thread 2|v at the top,
be then avoided by lessening the load, or provid
ing stronger apparatus.‘
I ,
. '
upon which a suitable. nut 22 is looked over a
It is therefore among the objects of this inven
ball race comprising bearing balls '23 and or-'
'dinary retaining plates 23' above'and below the
tion to provide, means for exploding a blank car
tridge when an excessive load has been’ attached 30 balls. ‘Beneath the ball race and upon the
‘shank of the hook is disposed a pressure ring or
to hoisting means and beforev the‘breaking'point
washer plate 21Lv The washer carries an integral ,}
'of the apparatus has been reached in‘ lifting.
arm 29 which is extended laterally, for creating
Particular objects are to provide“ a housing to
a sound signal when the load on the hook has
be coupled into a hoisting cable, with a coil
spring mounted in the housing upon which, the .35 depressed the washer and spring to a predeter
stress of the load is borne, by means of a shank
mined point. These parts may be assembled
on a hook or .eye'extended through the spring“,
down through an opening 25 in the housing
7' and said shank to carry an arm extending from
which may be then closed by a dust cap 26.
oneside to be moved downward as the spring is
v A partition 21 between the chambers ispro
compressed with the load, and then to cause the 40 vided with a slot 28 through‘ which the arm-.Tis '
?ring of the cartridge, when the. spring and arm
operated‘. Within the‘ chamber l1 and spaced '
have been depressed by.the load. to _ near the
beneath'the arm, is an adjustable block member
breaking point, and before the breaking‘ takes
3i provided with a barrel 32 in the lower portion '
place. _With these and other objects hereinafter
shown, I have illustratively exempli?ed mjy‘in 45 thereof, of suitable diameter for?receiving va
blank cartridge 33 of, any standard form,‘with
vention by the accompanying drawing, of which:
Figure 1, shows an elevation of the assembled
parts, with a hook member for attaching loads.
cap 33" and rim 34. ‘ A groove 35 around the bar- '
rel, is provided to receive the rim» and support
‘the cartridge in suitable position.‘ A doorway
some other parts insefction. Figure 3 is a cross 50 46 through the wall of thepblock permits the in
sertion and removal of'the cartridges. .A j?ring' .
section view taken on. line 3—3. of Figure‘ 2.
pin‘ 36 is slidably positioned in the upper portion .
Figure 4 is a cross section view taken on line 4:—fi
of the barrel for exploding the cap and cartridge .
of Figure 2. .-Figure 5is an enlarged detail view
for'the signal. A post 30 is extended above the
in section of the chamber for holding a cartridge,
Figure 2, shows the hook, with the housing and
and a ?ring pin above the same. ‘ Figure 6 is an
pin point, provided with a ?ange v36' upon which .
is mounted a propulsion spring 31, the top of
which is extended against the ceiling above.
In order to retain the spring 3'! in compressed
condition for propelling the point 36, a latch
when the coil spring has been compressed to a
predetermined safety point, an explosion barrel
adjustably mounted in the housing in spaced re
lation beneath the arm, means for supporting a
spring 39 is connected as by a screw 40 to one
cartridge in the barrel, a latch resiliently pressed
side of the block, which carries at the top a latch
into one side of the barrel, a ?ring pin for ex
or lip, 4|. This lip is normally pressed inward
ploding the cartridge normally supported by the
through a slot 42 and into the barrel and upon
latch, a propulsion spring normally compressed
which the ?ange 36’ and pin are then supported. - by and above the ?ring pin in the upper portion
The lower edge of the lip as at 43 and the upper 10 of the barrel, a trigger bolt slidably mounted
edge of the flange 36’ are preferably beveled to
between the latch and the arm and having a
facilitate the “setting” of the pin and spring 31
tapered lower point adjacent the latch adapted
above the latch in readiness for ?ring the car
tridge. The pin may be so set up, and the spring
31 compressed by the operator using any rod en
pulsion spring for exploding the cartridge, when
to release the latch from the ?ring pin and pro
A portion of the lip is narrowed to form a _
shoulder 44 as seen in Fig. 7, to provide a ful- ‘
the arm is lowered to a predetermined point by
the load on the hook.
2. A housing supported by a hoisting cable, a
member for attaching a load extended from the
crum for Withdrawing the latch from beneath
housing, a spring mounted in the housing and
tered from below, before the cartridge is placed.
the ?ring pin. Adjacent this shoulder is slidably 20 forming the sole supporting means for the at
positioned a tapered lower end 45 of a trigger bar
tachment member, and being adapted to carry
47. The body of the bar is slidably disposed
a predetermined load with safety before becom
upward through a socket 49 to a point slightly
ing compressed by an overload .tending to the
below the actuating arm 29. The tapered point
breaking of the parts, an explosive cartridge ad
is normally sustained above the latch by a light 25 justably disposed in the housing, said attach
spring 48, which is compressed between a collar
ment'member provided with a shank extended
5| on the bar, and the base of the socket. , A‘ cap
to above the spring and having an arm at right
plate 50, attached to block as by screw 52, pre
angles therewith, a ?ring pin resiliently and slid
vents the collar and bar from being lost from the
ably mounted above the cartridge,‘ and means
socket. The lower end of'the bar ‘above the ta 30 operated by the arm for projecting the ?ring‘pin
pered point is slidably disposed through a hole in
upon the cartridge for ?ring the same when the
the block above the latch, and this hole is ex
spring has been compressed to the predetermined
tended beneath as.49', to permit the lower and
limit for safety.
tapered point to be pressed downward by the arm
3. A swinging housing for lifting weights, a
for expelling the latch from beneath the ?ring 35 load spring mounted in the housing, a lifting
hook provided with a shank supported entirely
The several parts are so adjusted, that-when
by the load spring, an arm extended laterally
from the shank for creating an alarm when the
down and compressed the load spring [9 to a
load on the hook has reached a predetermined
point near the danger limit, that the arm will 40 limit, an explosive body mounted in the housing,
have also depressed the trigger bar till the latch
a trigger bolt adjustably disposed beneath the
is removed from the ?ring pin. Thereupon the
arm,'and adapted to be depressed when the arm
spring 31,projects the pin 'down upon the cap,
is depressed by the load, means ,operatively con
and explodes the cartridge. The cartridge being
nected with the .bolt for ?ring the explosive
con?ned in the block barrel except at its lower 45 when the load has depressed the arm to, a pre
a predetermined load on the hook has drawn
end, creates a loud report, which is readily heard
and distinguished from othersounds; After the
discharge, the block may be removed by releas-v
determined danger point.‘ t
4. A suspension eye including ‘a swinging sup
port, a shank portion on the eye withinjthe sup
ing the set screw 52, the empty shellremoved
port, a lifting spring in the support and forming
and a fresh cartridge replaced. The ?ring pin so the sole suspending means for the eye, said
is pressed above the latch, and the block ree
spring adapted; to sustain a predetermined load
- placed, ready for any possibly future overloading
with safety before becoming compressed by an
of the hook; The parts being enclosed by the
overload tending to the breakage of the’p'arts,
housing, permits the apparatus to be freely used
an explosive body mounted in the support to
and transported, without danger of exploding the 55 provide a sound signal when the spring has been
cartridge, until an overload is attached to the
compressed to near the limit of safety of the
‘parts, an arm extended laterally from the shank,
In some cases it is preferable to replace the
and means operated 'by the arm for firing the
hook member by a closed link member or eye as
53 and 54, on a shank 20' with thread 2|’ for the
holding nut 22. By the use of such an eye, the
apparatus maybe mounted' elsewhere, in the
Having described my invention, I claim as
1. A safety apparatus for sounding an alarm
when a predetermined load has'been raised by
a lifting cable, comprising a housing coupled‘ in
the cable,‘ a coil spring mounted ‘in the housing,
explosive, when the spring has been compressed
to the limit of safety by the load.
, '_
5. A suspension hook including a swinging
support for hoisting loads, the hook having a
shank portion within the support, a spring in
the support and forming the sole suspending
means for the hook,said spring being vadapted
to support a predetermined load with safety be
fore becoming compressed to a danger point by
an overload tending to the breakage of the parts,
and an explosive carried by the support and
a hook ‘for connection with theload to be lifted, 70 being automatically responsive toexplode by the
a shank extended from the hook‘ through the
spring and supported thereby, an arm extended
laterally from the vshank for causing an alarm
yielding of the spring for an alarm when an over
load is met.
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