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Патент USA US2131794

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0a. 4, 19%.
¢_ 5, CUSHWA'
Original Filed Dec. 13, 1953
‘ Patented‘ Oct. 4,1938
' Charles B. Cushwa, Youngstown, ‘Ohio, assignor
to The Commercial Shearing & Stamping Com
pany, Youngstown, Ohio, a corporation of Ohio
Original application December‘13, 1933, Serial No.
7‘02,l88.~ Divided and this application Septem
ber 20, 1935, Serial No. 41,435
1. Claim.
(01. 61—45)
segment ID is shaped by pressing, drawing, or
My invention relates to linings for earth bor
ings and, in particular, to fabricated linings hav- ' otherwise, from a single plate; The side and end
ing greater strength than such structures as edges of the plate are bent downwardly to'form
side flanges H and end ?anges l2. A stiffening
' known heretofore.
This is a division of my copending application‘ rib I3 is formed adjacent the center of the web
Serial‘No. ‘702,188, ?led December 13, 1933, for portion !4 of the segment, i. e., the portion be
Tunnel liners, now Patent No. 2,046,727, granted.
tween the side and end ?anges.
The rib I3 is
formed by slitting the web portion l4 adjacent
Linings for earth borings, for example, tun- . the end ?anges, as shown at 15, and'pressing in
.10 nels, as usually constructed, include ‘a plurality wardly the 'web material between the slits. The 10
of rings disposed side by side and secured to
rib 13,701c course, greatly increases the rigidity
‘July 7,1936.
gether, each ring being formed of an assembly
of. segments. The loads sustained by such lin
of the segment lengthwise, as compared'to a '
segment without the rib.
ings are not uniform as to‘ distribution ‘or di- ,. ‘ Figures 5 through 8 show another form of seg
ment indicated at 20., The segment 20 is pressed 15
lining have great strength in order to withstandv from a single ‘plate like the segment l0 but has
separately formed end walls 2|. Theweb of
the loads which may be’ concentrated -at any par
‘ rection and this fact makes it essential that the
the? segment 20 is bent to form side ?anges 22.
The intermediate portions .of the web are doubled
ticular area. While numerous types of segments
for linings have previously been proposed, prac
20 tically all of them with which I am familiar have
back‘on themselves to‘form ribs or plaits 23 ex
tending longitudinally of the segment. The end
walls 2| are attached to the ends of the segment
has ‘been vthe fact that many of them relay on . by welding. It will be apparent that the length
bent-up ?anges to transmit circumferentially ‘of wise rigidity and strength of the segment of Fig
the lining from one segment to itsneighbors, the ures 5 through 8 are even greater than those of
the segment of Figures 1 through 4. Thenum
radial force which may happen to befconcen
- trated thereon. It is obvious that‘ a bent ?ange ber‘ of ribs 23 may be varied to suit different
has a very low resistance to further bendingand conditions and the longitudinal strength and rié
is, therefore, a highly inefficient means for trans 'g‘idity of the segment will vary correspondingly.
mitting radial hrusts from one segment to ad
A particular advantage of the'construction shown
so ' jacent
‘ segments.
in Figures 5 through 8 is that the ribs 23 abut
I have invented a novel form of pressed steel against the end Walls 2| and therefore provide
segment from which tunnel linings may be ‘ase substantial support against inward bending of v
been characterized .by weak points. One of the
points of greatest weakness in prior structures
the end walls which might otherwise result from
The segment of my invention is char- '
acterized, by great strength circumferentially of
a completed lining ring for transmitting stresses
the circumferential forces set up by stresses ra
dial to the completed tunnel lining.
applied radially of the completed lining. The
It will be apparent from the foregoing de
segments, ‘furthermore, .are very‘ rigid through-_ .scription that my invention provides a number
out their length. An embodiment of the inven- ' of forms of liner segments characterized by.
greater strength than those known heretofore, 40
40 tion is shown in‘the accompanying drawing, to
gether with a modi?cation thereof,,_although the
particularly with reference to the resistance of
the segment to bending of the ?anges thereof
drawing is merely illustrative and does not rep
resent the only forms in which the inventionmay
relative to the body portion.
WhileI have illustrated only a few possible em
be incorporated. In’ the drawing:
Figure l is a plan View of a segment according
to my inventiony
Figure 2 is a side elevation thereof;
Figure 3 is an end view;
' shown and described herein without departing
from the spirit ofv the invention or the scope of
“Figure 4 is a sectional view along the line
50 IV—IV of Figure 1;
Figure 5 is a view similar to Figure 1
a modi?ed form of the invention;
v Figure 6 is a side elevation thereof;
Figure '7 is an end view; and
. the appended claim.
I claim:
A liner segment comprising a ‘plate curved -
along one. dimension, side walls extending in-‘
Wardly of the curved edges of the plate, said plate
having a plait forming a strengthening rib ex
Figure 8 is ‘a sectional view along the line
VIII-VIII of Figure 5.
bodiments of the invention, it will be apparent
that it may be otherwise constructed than as
Referring in detail to the drawing, and for the
present, to‘ Figuresv 1 through 4 particularly, a
tending inwardly of the plate to substanitally
the depth of said side walls and end walls welded
to the ends of the side Walls and of the plait. .
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