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Патент USA US2136420

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NOV. 15,
c. |__ EDWARDS
QOLLAPSIBLE TRESTLE
‘2,136,420
Original. Filed Nov. 27, 1936
i.
.5”.,“w,
Attorney.
Patented Nov. 15, 1938
.
' 2,136,420 3
UNITED v'STMI'E,5'? PATENT OFFICE?
Application November- 27, 1936, Serial No. 112,908
.
Renewed April 7; ‘1938 .
‘
~
4 Claims. ’ (c1. ‘so4_5)
This invention relatesto certain new. and use
ful improvements in collapsible trestles, the :pe
culiarities of which will be hereinafter fully de
wise.
The brackets are thus'rigidly secured to
their respectivelegs. Their matching transverse
arms 2-2’ are pivotally connected by a remov
able bolt 8'. Spaced holes in said transverse arms
:More speci?cally my improvements relate allow of varying the transverse distance between .5
.mainly to connecting corner brackets on sup- 7 the longitudinal arms 3—.—3"of the brackets so as
scribedand claimed. ‘
porting'legs,’ each pair of. said brackets having
transverse arms pivoted together and longitudinal
arms engaging the side edges of a longitudinal
,10 plank connecting opposite pairs of corner brackets .
on. their supporting, legs.
to receive planks of different width.» A wide plank
may thus be used as’ a bench by. a carpenter or
plumber.
I‘
-
~
,,
This cornerbracketiis preferably made from _
rolled plate 1 metal '(Fig. 5). that can be cut to
of ahorizontal connecting plank with the adjacent
the desired shape and the holes punched by
stampingdies; then'bent at right angles to the
dotted line Fig. 4, to right orleft, to form the
15 pair of supporting legs; and second, for a trestle
that is vstrong, adapted for use by masons, car
-In its ?at. shape shown in; Figs. 4 and 5, the
The main objects of my invention areto pro- _
- vide means ?rst, for securely engaging each end
right or left bracket shown in Fig, 3.
ll,
penters and others, is practically indestructible in , two arms ,Z-Vand 3, point in opposite directions in
ordinarycircumstances, and can be readily, taken ,the same plane but unaligned with each other,
apart, occupies small space in transportation, and and are connected by an integral lateral extension
from the inner ends of saidarms, which exten
In' the accompanying ‘drawing in’ whichlike' sion is common to both the arms. The portions
reference numerals indicate corresponding parts: oisaid extension on opposite sides of a medial
'20 can be quickly set up for, use.
vFig. 1 represents a side elevation ofa trestle
embodying my invention;
25
,
’
'
‘
Fig; la, an enlarged detail‘ on the section line
Ia,—la, Fig. l.
i
e
Fig. 2, an end ‘view of Fig. 1;
'
Fig. 3, an enlarged detail in isometric projec
tion of a .pair of supporting legs and their con
30 necting corner brackets;
Fig. 4, a face view of a corner bracket as stamped
from metal plate in its ?at condition before bend
ing at right angles on the dotted lines; and
Fig. 5, a vertical edge view of the same in
35 said ?at condition.
'
Referring to the drawing, the numerals I—l’
designate a pair of supporting legs of angle iron
or other suitable shape, disposed substantially ver
tical in a transverse plane and slightly inclined
40 in longitudinal planes as desired. On the top
end of these legs is securely mounted by rivets or
otherwise, corner brackets consisting of ?at plate
arms 2 and 3, at right angles to each other in
transverse and longitudinal position respectively,
from the meeting corner 4. The longitudinal
arm is preferably at a higher level than the trans
verse arm to allow the longitudinal connecting
plank 5 to project as shown in Fig. 1, as is usual
in such trestles; but they may be otherwise dis
posed. Although in different horizontal planes,
both these arms have de?nite downward exten
sions 8—-1 in planes meeting at right angles on
said corner 4 to forma downward angle exten
sion of said arms that corresponds to the angle
leg that is secured thereto by rivets or other-‘
dotted line, form ?anges 6 and 'I of a right,
angle'extension when the ?at shape, is bent
on this line. so as to adapt‘ the bracket for fasten
ingto the respective supporting leg angles l—l'
as shown in Fig. ‘2. .The arms 2. and 3 respectively
integral with the ?anges 6 and ‘I, are thus dis
posed in planes at right angles to each other,
the arm 2 being adapted for pivotal connection
with the corresponding transverse arm 2' oi.’ the
opposite bracket as previously described, and the
arm ,3 being disposed longitudinal to the trestle
andadapted for ‘supporting the plank interposed
between arms 3——~3’.
'
w
35
The bracket may be otherwise made, but in
vestigation indicates the stated method as being
cheaper and preferable forproduction in quality.
The horizontal arm 3 is ?at like the pivoted
arm 2, and angle extensions 9—'9’ are riveted or
otherwise secured to the respective arms 3-3’
which are disposed parallel and opposite each
other, so that their horizontal ?anges support
said interposed plank 5, while the vertical ?anges,
slightly inclined inward (Figs. 2 and 3) grip the 45
side edges of the plank. Such gripping engage
ment is supplemented by pointed rivets l0 (Fig.
3) having shoulders ?tting against the ,inner
face of said ‘vertical ?anges and the reduced
shank extending through the ?ange and adjacent 50
arm and headed on the outside in the usual
manner. Thus two or more pointed rivets in
each of the arms 3—3' secure the extensions
9—9’ rigidly to the arms and also provide posi
tive engaging means for the plank.
65
2
2,136,420
Swinging the legs |—-l' on the pivot bolt 8
toward each other, will widen the space between
the angle extensions 9—9' for placing the plank
between them. Then, spreading said legs will
force the points I 0 into positive engagement with
the plank. The legs are thus braced outward by
a spreader bar I I, pivoted to one leg and having
notch-es near the other end, one of which engages
a stud pin l2 in the opposite leg, as shown in
10 Fig. 2.
A‘ similar notched bar II’ near the re
mote ends of the extensions 9-9’ also serves as
a connector to hold the adjacent points Ill en
gaged with the plank after they have been forced
into it by hammer blows or otherwise.
15
Fig. 1a shows this bar H’ engaged with the
stud pin 12’ in the horizontal ?ange ‘of the adja
cent angle extension.
_ '
Fig. 3 shows the preferred construction having
the upper faces of the horizontal ?ange of the
20 angle extensions 9—-9', and the adjacent top of
the lower .plate arms 2—.-2’, disposed substan
tially in the same plane so as to- be even with
each other and thus contact with the bottom of
the inserted plank .so that both. assist in sup
porting’ it.
.
.
The legs may be lengthened vas indicated in
Fig. 1, by bolting an angle or other piece to said
legs. In using such a trestle on a sloping roof
for instance, one of the legs of each .pair is
30 lengthenedgas much as required by the. slope.
‘A diagonal brace 13 from the end of an angle
extension downltor the adjacent leg (Fig. 1) may
be used when the legs are of such length that
stiifening them, or the middle of the ‘plank, is
" desirable.
When collapsing the trestle, the spreader bar
H‘ and connectorbarjll’ are disengaged from
their stud pins, and the 'pivot bolt 8 removed
in-each pair, so that the dismantled members take
40 up comparatively'little room in transportation or
storage'
"
'
Having thus ‘fully vdescribed my invention what
45
corner bracket consisting of a ?at rolled plate
having arms bent at right angles to each other,
one arm being above the other arm and riveted
to the vertical ?ange of said angle support so
that the horizontal ?ange of said support is even Cl
with the lower arm of the said bracket, and said
lower arm having spaced holes for variably piv~
oting to a matching arm of an opposite bracket,
and a downward angle extension from said arms
riveted to said angle leg whereby said leg and 10
horizontal angle support are rigidly connected
substantially as described.
2. A collapsible trestle having in combination,
horizontalparallel opposing angle supports for an
inserted. plank, means for pivotally adjusting the
‘space between said supports to grip the inserted
plank, and a notched bar pivoted under the end
of one support and having notches near its other
end variably engaging a stud pin projecting below
the opposite support to tie the ends of said sup- >
ports in gripping position, substantially as de
scribed.
3; In a collapsible trestle the herein described
pair of corner brackets having arms respectively
pivoted together disposed transversely to the -
trestle, and each. bracket characterized-by an arm
at right angles to and, higher up than, its trans
versearm and adapted to support an interposed
plank,.and both arms .of respective brackets hav
ing downward extensions forming ?anges in
adapted to be secured to respective supporting
legs, substantially as described.
'4. In 1a collapsible trestle the ‘herein described
pair of corner brackets having ?at metal plate "’
arms with spaced holes for adjustably pivoting
together transversely to the trestle and each
bracket characterized by a-plank-supporting arm
at right angles to and higher up than its trans
verse arm, and both arms of respective brackets
having integral downward extensions forming
?anges at right angles to each other in planes
I ‘claim as new and desire to secure by Letters
meeting on a corner‘and adapted to be secured
Patent, :is:
to respective supporting legs, substantially‘as de
scribed.
'
1. A collapsible trestle having in combination,
a vertically disposed angle'iron leg, a horizontal
angle" iron support for a plank, and a connecting
so ‘
planes meeting at right-angles on a corner and
CHARLES L. EDWARDS.
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