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Патент USA US2096331

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Oct. 19, 1937. -
Filed July 25, 1936
2 Sheets-Sheet 1
„. .
Oct.V `19, 1937.
Filed July 25, 1936
2 Sheets-Sheet 2
Patented oct. 19, 1937
Daniel Livingstone, Nantasket, Mass.
Application July 25, 1936, Serial No. 92,579
' 1~ Claim.
My invention relates to a coiïerdam structure
for use in excavating >holes for poles, posts and
the like and it has for its object to provide an
lefficient and inexpensiveV portable coiferdam
5 structureA through the use of which the operation
In the accompanying drawings:
serted therein after which the excavating is
continued within the coiferdam and as the earth
is removed the coiferdam follows, or is caused to
follow, the bottom of the hole downwardly, the
more or less pointed lower ends of the sections I0
permitting the latter to be forced downwardly
into quicksand or soft ground as the material at
the lower end of the cofferdam is removed from
the latter. During the progress of the work the
indentures I 5 also give access to the earth along
side of the lower end of the coiïerdam.
When the hole is of the desired depth the pole
I 6 is placed within the coiîerdam as shown in Fig.
4, with a suitable tackle, not shown, attached to
its upper portion. The rope of this tackle is then
threaded through and tied or otherwise fastened
Figure 1 is a side elevation of a coiferdam struc
to one or both of the eyes I3 after which the
ture constructed in accordance with this inven
tackle is operated to pull the cofferdam upwardly
n of planting or erecting poles, posts and the like
is facilitated, particularly in situations wherev
there is quicksand or where the ground is loose
To these ends I have provided a portable coffer
dam unit having the peculiar features of con
struction and'mode of use set forth in the follow
ing description, the several novel features of the
invention being separately pointed out and de
15 fined in the claim at' the close thereof.
Figure 2 lis an elevation of another side of the
„structure shown in Fig. 1.
Figure 3 is a section on line 3-3 of Fig. 1.
Figure 4 illustrates the manner in which my
new cofferdam structure is used.
` The illustrated embodiment of my invention is
an elongate tubular metallic unit which may
measure, for example,»eighteen inches in diam
eter and three feet in length when designed for
use in connection with the erection of poles for
30> supporting electric light and power conductors.
As herein shown this unit consists of two im
perforate semicylindrical metallic sections I0
out of the hole.
When the coiïerdam is above the ground one 1
of the pintles I I is removed thus freeing the two
sections ID so that they can _be swung away from
each other on the remaining pintle as a pivot or
hinge, thus opening the cofferdam so that it can
be removed from the pole for use at another lo 25
Each pintle I I is made at its upper end with a
head IIa in the form of an eye for engagement
with a hook or other tool by means of which it is
conveniently removed as described.
What I claim is:
’ each of which is interiorly and exteriorly smooth
A portable cofferdam structure comprising a
pair of metallic sections each made with an im
and longitudinally level throughout except that
perforate semicylindrical body portion provided
35 a small bead or flange may beprovided upon
the outside and at the top thereof, as shown.
'I'hese sections are separably fastened together at
their opposite sides to form an imperforate tubu
lar cofferdam unit or Vmember by two removable
pintles II which extend loosely through inter
meshed apertured' lugs I2 provided at opposite
sides of the sections.
Each .semicylindrical section l0 is provided at
its rupper end-midway between its opposite
45 sides-_with an aperturedlug I3, while its lower
along its opposite sides with a row of longitudi
nally apertured lugs alternating and intermesh
ing with the lugs of the other section so as t0
provide an elongate and imperforate cylindrical
tubular member whose interior and exterior sur
faces are longitudinally smooth and level from a 40
point closely adjacent to their upper ends to their
lower extremities, said sections being pointedly
tapered at their lower ends and each made at its
upper end with an upstanding apertured lug for ,
engagement with the rope of an overhead hoist 45
end is cut away or rounded as at I4 so that when
ing tackle, and a pair of pintles, one removably
the two sections are secured together by the
pintles II the lower end of the tubular structure
mounted within the intermeshing apertured lugs
y thus formed isprovided with two oppositely dis
50 posed indentures I5 as will be clear from Figs.
at one side of said member and the other remov
ably mounted within the intermeshing apertured
lugs at the opposite side of said member, each 50
Zand 4.
f of said pintles being made at its upper end with
The above described cofferdam structure is for an eye disposed above the upper end of said mem
use in digging holes for poles, posts and the like, ' ber by means of which said pintle is removed to
in locations where the land is boggy, sandy or disconnect said sections.
55 loose,'or where there is quicksand. In making a
hole the latter is started and the cofferdam in
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