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Патент USA US2130399

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Sept. 20, 1938.
Filed NOV. 24, 1936
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. vPatents-4:1 Sept. 20, 1938
Albcrth Rypinski, Laurclton, N. Y., assignor to
Metropolitan Device Corporation, a corpora
tion of New York
Application November 24, 1936, vSerial No. 112,497
2 wishes. (@i. 220-55)
The invention herein disclosed relates to an
article made from sheet metal and in particular
to the construction of a tapped socket for receiv
Fig. 6 is an elevation of a tap used in threading
the machine screw socket.v
In Figs. 1 to.3 there is illustrated a sheet metal
box 6 with the side walls and bottom stamped
Heretofore, in the construction of sheet metal from a single piece of sheet metal, the sides being 5
' articles, it has been the practice wherever it was
welded together. A cover 2 having lateral de
necessary to secure two angularly disposed mem- _
here or sections together by a machine screw, to pending ?anges 2a which overhang the sides of
the box is provided for the box. The cover 2 is
provide an angular-1y disposed lug or an angle se
cured to one of the members. "ll'his lug or angle secured on the box by means of machine screws 3,
of which is illustrated enlarged in Figs. 2
is drilled and tapped to receive the‘ machine one
and 3. 3
screw. For example, in the construction oi‘ sheet
Threaded sockets are provided in the side walls
metal cabinets, and particularly electrical conduit of the box to receive the machine screws 3. Each
boxes and switch cabinets, it is the common prac-_ of these threaded sockets is formed out of the ma
tice to secure several lugs to the side walls, or pro
vide the equivalent thereof by cutting a tongue in terial of the side wall in the manner illustrated 15
in Figs. 2 and 3. The socket shown in these ?g
the metal which is bent at right angles to the side ures
of the drawing is formed by drawing a por
wall. .These lugs are drilled and tapped to re
of the metal'of the side wall, adjacent the.
ceive machine screws that pass. through openings tion
920 in the cover or an intermediate partition, as the edge, to form an inwardly extending offset por
tion or bulge d. This onset portion is lanced to a
case may be, that is to be secured to the side wall. form
a strap 5 united to the odset portion at each
By this invention, the necessity for these lugs is " end but disconnected along its side edge. The
eliminated. In accordance with the invention
there is provided a screw-receiving socket that is metal of the strap 5 is drawn to form a section 51;
25 formed out of the sheet metal. The sheet metal of substantially semi-‘cylindrical con?guration ex
is lanced and the‘ strap formed by lancing the - tending into the box, the axis of the semi-cylin- 25
drical section 5a being parallel to the plane of the
metal is- drawn and shaped to forms. semi
perpendicular to the plane of the
cylindrlcal strap. In addition the sheet metal on cover.wallA and
semi-cylindrical depression ii, coaxial
L either side of the strap is pressed to form a semi
80 cylindrical groove which with the semi-cylindrical with the semi-cylindrical section 5a of the strap,
is formed in the o?set portion 6 of the side wall.
section of the strap forms a socket, the ems of ‘These two semi-cylindrical sections form in effect
which is parallel to the plane of the sheet metal a cylindrical socket.
piece, or it may be inclined thereto. When the
In threading this socket to receive a. machine
socket is tapped it provides a satisfactory socket screw,
a tap ‘I such as illustrated in Fig. 6 is used.
35 for a machine screw with suiliclent threads of
has along section la between its end 35
su?icient depth to retain a machine under all and the beginning
of the e?‘ective threads. The
ordinary forces exerted by tightening a machine section
To is of sumcient length to pass through
ing a machine screw.
Two cabinets having such threaded sockets are
40 illustrated in the accompanying drawing in
Fig. -l is a. section through a sheet metal box or
cabinet for an electrical conduit system, the cover
45 being secured on the box by machine screws;
Fig. 2 is an enlarged, fragmentary section taken
on the line 2-2 of Fig. 1;
'Fig. 3 is an enlarged, transverse, fragmentary
section taken on the line 3-8 of Fig. 2;
Fig. 4 is a fragmentary, side elevation of a.
corner of another box, one in which one side wall
is secured to the adjacent side wall by a machine
' ’
Fig. 5 is a fragmentary. plan view of the some,
55 looking into the open end of the box; and
. the strap 5 and engage the inner end of the oil’
set portion 4 of the side well before the eii'ectlve
- cutting threads of the tap bite into the metal of
the strap. If an ordinary tap is used, it has a
tendency to pass through the slot formed by
lancing the o?set portion 4 as it is opposed by the
strap 5 on one side and has no resistance on the
other. _ when however the end of the tap extends
below the strap i it is held by the offset portion 4
coaxially wlththe axis of the section to of the
strap and the depression 8 in the offset por- .
tion I.
The machine screw I extends through an open-. 50
log in the cover that is aligned with the socket
formed in the side wall. The threads of the
screw engage the threads cut in the strap 5 and
the threads cut in the wall of the depression
6 in the onset‘ portion 4. While the walls of
construction-s. The-socket is readily
the socket are not continuous, nevertheless there v _ and. inexpensively formed and does not in the .
are suiiiclent threads engaging the threads of manner of ailu'g extend from the side wall to
the‘ screw 3 so that the force exerted by tighten
ing the screw 3 in the ordinary manner, that is, form an obstruction, has'beenvI
II I‘;
While the invention
' with a hand screw-driver, is resisted and the con
socket for a machine screw it will be a
tact of the threads is su?lcient toprevent ‘a
stripping oi’ the threads. -
. ‘
The oii'setting of the portion .4 servestwo'pure -
poses. It‘ relieves thetap from ‘cutting except
t that
it is equally useful with other fasteners such for
example --as_x_.a .stud, bolt. -It is .~.also. obvious that
various changes may be made byj'those' skilled in
the art in the details oi the speci?c embodiments
where it is desirable to cut threads and it moves ,; illustrated in the-.drawing and described in detail
the edge of the coven,~
the screw head in from
va'bove within the principle and scope of the in
vention as expressed in the appended claims.
In the; box illustrated, countersunk ‘?nishing
washers 8 surrounding the, screw 3 are used,- but
these form no part of the invention.
' In Figs. 4 and 5 a corner of a _box 9 is
illus- ‘
trated. This box has the bottom‘and'side walls
'a ‘single piece of sheet
formed from
1. In ‘a sheet metal cabinet construction having
walls oi?sheet metaL-the feature of novelty con
sisting of a wall of‘ the "cabinet having a portion
to" form an arcuate depression, spaced."
“ the upper ends of_ adjacent-side walls of the box I ' pressed
traversing the ‘arcuate depression ,
are securedjo'gether by machine screws. All of ' and the space between the slits struck out forming
20 "the sidewalls
are similarly secured together in the
'n'iariner'ofrthesside walls iii and _II forming the
.- illustrated corner of the box. In the side wall
I H ,1 there‘ is formed a threaded socket denoted gen
( >
the numeral II. This socket is in all
similar to the socket formed in the box
26 respects
I illustrated in-Figs. 1_ to 3, except that the
axis of the socket I2 is perpendicularto the plane
of the side wall iii. A machine screw it extends
'er‘ally by
an arcuate strap extending from" the mace To!
the wall-and forming with the 'arcuate depression‘:
a substantially cylindrical‘ socket, the inner'sur- _
face of the strap and thearcuate depression on
each side'ot the strap being threaded to receive
a machine screw.
2.‘In a sheet metal
cabinet construction hav-~
ing walls of sheet metal, the ieature of novelty‘
consisting of a wall of the cabinet having a por-‘
in, the side wall .iil that is. tioh pressed 'to vform an arcuate depression spaced
coaxial with the socket i2 and engages the threads from-the plane of the wall, spaced, parallel slits.
ofthe socket l2. The wall III is shown slightly‘ traversing the arcuate depression and the space
~' through an opening
, spaced from ‘the edge of the wall II for the pur
pose of illustration. but when the screw II, is
tightened the wall ii! is ?rmly clamped against
_, " It will beapparent to those skilled in the" art
" that by the construction illustrated in the draw-»
F ing anddescribed above, there is provided a con
' venient “and effective machine screw socket for
between the slits struck out forming an arcuate
strap which with the arcuate depression forms a.
substantially cylindrical socket. the inner sur
face- of the strap and a portion of thearcuate
depression on each ' side of the strap being
threaded to receive a machine screw.
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