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Патент USA US3100580

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Aug. 13, 1963
, 3,100,575‘ ‘
Fiiled Sept. 5, 1962
Stuart A. Coffey '
aisasrs p'
U?imd‘ States Patent 0
Patented Aug. 13, 1963
welded together. The crane boom life guard consists
of a pair of parallel top tubes 11 having one end, the
rear end, which is the left end on the appended draw
ing, secured to an inverted U-shaped member 12 that
Stuart A. Coffey, 1006 Main St, Little Rock, Ark. '
Filed Sept. 5, 1.962., Scr. No. 221,532
1 Claim. (Cl. 212—'-1)
has each lower end terminate in an upturned hook 13 as
best shown in FIGURE 2 of the appended drawing where
itfis to be noted that the aforesaid inverted U-shaped
member 12 has curved rather'than straight sides. Each
lower end of the aforesaid inverted U-shaped member
This invention relates to construction machinery and
more particularly to a safety device in the form of a
cage that acts as a life guard on the upper end of crane
10 12 is connected to a horizontal and parallel steel tube
v ' The owners and operators of cranes having long booms
have for years been" looking for some form‘ of a device
that acts as a life guard against the danger of the upper
1-4 that has‘ its front end terminating and. connecting
with’ the pair of curved end members 15 each of which
is a continuation of the already described top tube ‘11
end of the crane boom from accidentally striking high a
of this novel invention.
voltage electric lines, and thereby seriously burning or
is provided with intermediate inverted U-shaped mem
The aforesaid crane boom 10
causing the death of all who may be in contact with the
crane at the time of the accident.
Although a number of ‘life guard devices have ad
mittedly found their way onto the market, none have
bers 16, 17, and a later to be described member 18 as
clearly shown in FIGURE 1 of the appended drawing
where it is seen that member 16 contains a lateral cross
tube 19 from which is suitably hung a pair of porcelain
rear gantry cable sheave 22 of nonconducting Micarta
is suitably'secured to the bottom of each porcelain in~
proven to be successful, either because they were too ,20 insulators 20 by means of insulating top supports 21.
light in weight or else they did not effectively prevent
the high voltage electric lines from coming into contact
with the crane boom’or its cables.
s-ulator'Zti' as best shown in FIGURES 2 and 4 of the
appended drawing. A second pair of porcelain insula
It is,‘ therefore, an object of this invention to provide
an eifective crane boom life guard that'will automatically: 25 tors 23 are horizontally mounted in parallel spaced rela
tion to each other in the ‘front end of‘ this unique crane
keep all highgvoltage electric lines ‘from ever touching the
crane boom or its ‘cables.
boom life guard 10 as one can readily‘ see on looking '
at FIGURES 1 and 6 of the drawing. A hard rubber
shock absorbing mount 24 is located at each end of each
30 one of the porcelain insulators 23 in order to provide
in comparison towits' size.
still further insulation and safety to anyone who may
Another object of this invention is to provide a crane
be in touch with the crane on which this invention is
boom life guard that can quickly and easily be mounted
secured at the time of an accidental touching of the
on the upper end of a crane boom with a minimum of
crane’s boom to a high powered electric line. Returning
Another object of this invention is to provide a crane 35 to the curved end members 15, it will be ‘seen that the
lower end of each one of thesemernbers terminates in
boom lifeguard that has rear ‘gantry cable sheaves of
Another object of this invention is to. provide a crane
boom life guard that is bothrugged and light in weight
nonconducting Micarta for secondary protection against
an upturned hook .25 that serves the same purpose as
the already mentioned upturned hooks 13. A brace
Another object of this‘ invention is to provide a crane 40 tube .26 connects each lower side portion of the member
18 which is elliptical when viewed from either the front
boom life guard having line hooks that will'prevent
or back and which is best illustrated in FIGURE 3 of i
‘ electric linesfrom skating onto unprotected portions of
the appended drawing. A diagonal brace tube 27 con
nects the lower end of each one of the aforesaid brace
Still another object of this invention is to provide a
‘ crane boom life guard that can be mass produced to ?t 45 tubes 26 with the lowermost side portion of the inter
mediate inverted' U-shaped member 17. A U-shaped
the upper end of any crane boom.
member 28 is centrally located on the lateral portion 29
‘Other and vfurther objects and advantages of this crane
of the inverted U-shaped member 12 in order to prevent
boom life guard will be hereinafter described, and the ‘
{any high voltageelectric wires from touching the crane
novel features thereof de?ned in the appended claim.
Referring to the drawing:
The construction of this invention, an important and
FIGURE 1 is a side view of this invention ready for
noteworthy contribution to the art of producing safety
installation on the upper end of acrane boom.
devices, has now been described. The way in which
FIGURE 12 is'a sectional view of the invention taken
.this crane boom life guard is attached to the upper end
substantially along line 2--2 of FIGURE -1 as viewed
electric shock in the event of insulator damage.
of a crane boom may vary with the detailed construction
of each boom, therefore, no explanation of this process I.
FIGURE ‘3 is a front view ‘of this'invention taken sub
stantially as indicated, by the arrow and numeral Sin " 7' of attachment is given in this speci?cation‘ since it will
" be basically understood by anyone having experience with
crane boom assemblyor having any other form of me
FIGURE '4 is an enlarged view of that detail of this
invention indicated by the arrow and numeral 4 in FIG .60? chanical experience.
in'the direction indicated by’ the arrows.
f URE ‘1.
From the foregoing it will now be seen that there is _
herein provided a crane boom ‘life guard which accornr
FIGURE ‘5' is a sectional view of this invention taken
substantially along line '5—5 of FIGURE '1 as viewed in »' plishes all of the objects of this invention, and others,
including many advantages of great practical utility and
the direction indicated by the arrows.
commercial ~ importance.
FIGURE \6 is an enlarged side view of that detail of 65
As many embodiments may be made of this inventive
this invention that is indicated by the arrow and numeral
concept, and as many modi?cations. maybe made in
6 in’ FIGURE 41.
the embodiment herinbefore shown and described, it will '
Similar reference characters refer to similar parts
be understood that all matters herein are to'be interpreted
vthroughout the several views of the drawing.
merely as illustrative, and not in a limiting sense.
1 ' Having reference now to the drawing in‘ detail, there
In accordance with the provisions of the United States
is generally indicated by the character 10 a crane’ boom
life guard constructed from extra heavy steel-v tubing
patent statutes, as stated in the United States Code Title
35, Patents, I have now described the principle of con
struction and operation of my invention of a crane boom
life guard in the form Which I personally consider the
of heavy steel tubing, each one‘ of which extends from
the intersection of the last mentioned hea'vy steel brace‘ ' '
best embodiment thereof, and What I now claim as my
tubes with the lower portion. of downwardly and back;
invention and desire to secure by Letters Patent is:
A crane boom guard of the character described, com
Wardly curved portions of the two said longitudinally’
disposed tubes of heavy steel and the last mentioned
prising a plurality of longitudinally disposed heavy steel
hook shaped ends-of the same'he'avy steel tubes, and a
tubes in parallel spaced relation to each other and a
pair of porcelain insulators having insulating top sup
ports, the said pair of porcelain insulators being hung
plurality of inverted U-shaped members of. heavy-steel
vertically in parallel ‘spaced relation to each other from
tubes at right angle to the ?rst mentioned heavy steel
tubes, the lowermost ends of that inverted U-shaped 10 a laterally disposed cross tube secured within one of the
said inverted U-shaped members of heavy steel tubing,
member that forms the left end member of the said
and a Micarta sheave‘ rotatably mounted to the lower-_.
crane boom guard having their ends terminate in an
'most end of each of the said porcelain insulators and
upturned hook and a third upturned hoo'k ‘centrally lo
a pair of porcelain insulators horizontally mounted in
cated laterally on the uppermost portion of the said left
end member, the said third upturned hook (facing front 15 ‘parallel spaced relation to each other, and in the front _
ward and the front end of the upper two of the said
end of the said crane boom guard each one of the last
longitudinally disposed steel tubes being curved down
ward and backward and having their ends terminate in
a ‘frontwardly facing hook, the lower portion of each
mentioned porcelain insulators having a rubber shock
absorbing mount at each end thereof the said porcelain;
insulators providing means of mounting the said crane
one of the last mentioned steel tubes being braced by a 20 boom guard on the uppermost end of a crane boom.
diagonally disposed heavy steel brace tube that has its
rear ,end secured to the lowermost portion of the front
intermediate member that is elliptical when viewed from
the front and a second pair of diagonal brace members
References Cited in the ?le of this patent
Thomas _____________ __ June 20,1961
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