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Патент USA US2405794

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Aug“ 13, 1946.
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' 2,405,794}
PORTABLE DERRICK
Filed July 11, ‘1945
2 Sheets-Sheet l
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Inventor‘
GLENN.Z2L 0 OM l5 v
Aug- 13, 1948.
G. LQ'LOOMIS
'
.
2,405,794
PORTABLE DERRICK
.Filed July 11, 1945
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2 Sheeté-Sheet 2
Patented Aug. 13, 1946
2,405,794
.1
UNITED STATES PATENT OFFICE
2,405,794
PORTABLE DERRICK
Glenn L. Loomis, McAllen, Tex.
Application July 11, 1945, Serial No. 604,365
2 Claims. (01. 189-15)
The present invention relates to a new and
useful improvement in derricks for drilling and
servicing wells, and more particularly to a port
able derrick together with means for easily,
bedded in the base 5 adjacent its opposite end
quickly and safely raising and lowering the der
like l5.
rick as a completed unitary structure.
An important object of the present invention
is to simplify the usual procedure of building a
derrick piece by piece from the ground up and to
avoid the hazards of such procedure as well as
A pair of blocks l2 are similarly secured or em—
and to which a pair of the legs l3 of a derrick
M are pivotally attached by means of pins or the
‘
The derrick l4 may be of any conventional
construction, the present embodiment illustrat
ing a derrick of substantially U-shaped horizontal
cross-section as indicated in Figure 2 of the
drawings and also including a pair of rear legs
to eliminate a great deal of highly specialized
labor -_with its attendant high cost. The inven
tion contemplates the construction of the derrick
by bracing members |'|.
in a horizontal position on the ground and then
the legs l3 and I5 and on which a pulley |9 is .
IS, the legs being suitably connected to each other
-
A frame I8 is secured at the upper ends of
raising the derrick to a vertical position at the 15 lournaled‘. The lower ends of the legs I6 are
place where it is to be used.
adapted to enter sockets 20 embedded or other
It is accordingly an object of the present in
wise secured in the surface of the base 5.
vention to provide simple and practical means
A head-ache post 2| of conventional construc
for carrying out the aforementioned objects of
tion is also supported in an upright position on
invention.
20 the base 5 between the auxiliary mast 1 and the
Other objects and advantages reside in the
derrick | 4 and on the upper end of which a pulley
details of construction and operation as more
22 is journaled.
fully hereinafter described and claimed, reference
A hoisting drum 23 is also journaled in brack
being had to the accompanying drawings form
ets 24 secured to the base, the drum being oper
ing part hereof, wherein like numerals refer to 25 ated in any suitable manner for winding a drill
like parts throughout, and in which:
ing or‘hoisting cable 25 thereon.
Figure 1 is a perspective view showing the der
In the operation of the apparatus the rig foun- .
rick in raised position.
~
dation or base 5 is placed in a desired position
Figure 2 is a sectional View taken substantially
and the derrick I4 is assembled along the ground
on a line 2—2 of Figure 1.
Figure 3 is a fragmentary side elevational view
of the earth anchor for the auxiliary mast.
Figure 4 is a side elevational view showing the
auxiliary mast in position for raising the der
and its front legs l3 hinged to the foundation by
the blocks l2.
The auxiliary mast 1 is also assembled on the
ground and its legs 8 hinged to the blocks 6, the
derrick and mast extending horizontally from
rick, and
35 opposite ends of the foundation as shown in
Figure 5 is a similar view showing the aux
Figure 5 of the drawings.
iliary mast and derrick in a horizontal position
The drilling or hoisting cable 25 is unwound
prior to raising thereof.
,
from the drum 23 and passed over the pulley 22
Referring now to the drawings in detail where
of the head-ache post 2| and under and around
in for the purpose of illustration I have disclosed 40 the pully II on the outer end of the mast '| and
a preferred embodiment of invention, the nu
then back across the pulley 22 and ‘around the
meral 5 designates a base or foundation which
pulley I9 of the derrick and then back to the
may be laid at the place where the derrick is to
free end of the mast 1 and tied or otherwise
be erected.
suitably secured thereto.
A pair of blocks 6 are suitably secured to the
When the cable is reeled on the hoisting drum
base adjacent one end thereof, or embedded
23 the auxiliary mast 1 will swing upwardly and
therein, and to which the lower ends of an aux
assume a' vertical position as shown in Figure 4
iliary mast 1 are pivotally attached by means of
of the drawings until its arc of travel is arrested
pins or the like.
by a guy-wire 26 attached to the upper end of
The mast 1 is preferably in the form of a pair 50 the mast and anchored in the ground by earth
of spaced apart legs 8 connected together by
anchors 21, or by means of rigid braces in lieu
braces 9 of conventional construction and also
of the guy-wire where the character of the earth
having trusses |0 connected thereto for strength
so requires.
ening the legs. A pulley II is journaled at the
At this time all of the cables have left the pul
upper end of the mast.
65 ley 22 of the head-ache post 2|. A continuation
2,405,794
3
or the winding of the cable on the drum will then
pull the derrick [4 to a vertical position so that
the lower ends of the legs It will seat in the
sockets 20 and may be secured therein in any
suitable manner.
4
at one end to the foundation for movement from
a horizontal to a vertical position, said derrick
and said mast having pulleys at the upper ends
thereof, a post rising from the foundation be
tween the derrick and the mast, a pulley jour
naled on the upper end of the post, a hoisting
As soon as the derrick is in its raised position
drum rotatably mounted on the foundation, a
the auxiliary mast ‘I is lowered to its original
cable connected to the drum for winding thereon,
horizontal position, thereby being out of the way
said cable extending over the pulley carried by
until it is required to lower the derrick by re
10 the post, around the pulleys carried by the mast
versing the process above explained.
and the derrick, and returned to the upper end
It is to be understood that the derrick may be
of the mast for attaching thereto, said cable and
constructed of welded tube sections, or it may be
constructed of structural shapes or a combina- ' ' drum being adapted to successively raise the
mast and the derrick.
tion of both. The derrick may also be construct
2. Means for erecting a derrick as a unitary
ed of any suitable size within limitations suitable 15
structure and comprising a foundation, means
for handling .
for pivotally attaching the lower end of the der
In view or the foregoing description taken in
rick to the foundation while the derrick is in a
conjunction with the accompanying drawings it
horizontal position, an auxiliary mast pivoted at
is believed that a clear understanding of the con
struction, operation and advantages of the ap 20 one end to the foundation for movement from a
horizontal to a vertical position, said derrick and
paratus will be quite apparent to those skilled
said mast having pulleys at the vupper ends
in the art.
thereof, a post rising from the foundation be
A more detailed description thereof is accord
tween the derrick and the mast, a pulley jour
ingly deemed unnecessary.
‘
It is to be understood, however, that even 25 naled on the upper end of the post, a hoisting
drum rotatably mounted on the'foundation, a
though I have herein shown and described a pre
cable connected to the drum for winding there
ferred embodiment of’ my invention that the
on, said cable extending over the pulley carried
same is susceptible to‘ certain changes tully com
by the post, around the pulleys carried by the
prehended by the spirit of invention as herein
described, and the scope of the appended claims. 30 mast and the derrick, and returned to the upper
end of the mast for attaching thereto, said ca
Having thus described the invention what I
ble and drum being adapted to initially raise the
claim is:
'
mast, a guy wire attached to the upper end of the
1. Means for erecting a derrick as a unitary
mast to maintain the mast in its vertical posi
structure and comprising a foundation, means
for pivotally attaching the lower end of the deré 85 tion, and said cable and drum being adapted to
subsequently raise the derrick.
rick to the‘ foundation while the derrick is in a
GLENN L. LOOMIS.
horizontal position, an auxiliary mast pivoted
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