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Патент USA US2134533

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Oct. 25, ‘1938.
F. D. REILAND
CHAIR FOR SUPPORTING CONCRETE REINFORCING RODS
Filed Nov. 18, 1957
2,134,533
2,134,533
Patented Oct. 25, 1938
UNITED STATES *
PATENT OFFICE
2,134,533
CHAOIRVFOR SUPPORTING CONCRETE
REINFORCING RODS
Frank D. Reiland, Chicago, 111. ' '
‘ Application November ‘18, 1937, Serial No. 175,278
3 Claims.
(Cl. 72-—122)
This invention relates to a new and improved
chair for supporting reinforcing rods in concrete
beam construction.
‘
Concrete structures are usually reinforced by
steel bars or rods which are imbedded therein
at desired‘locations. In order that these rods
shall be properly positioned within the concrete
7 it is necessary that they be temporarily support
ed at the desired height within the wooden forms
before the concrete is poured. In the case of the
larger reinforcing rods, individual chairs are
often provided at intervals on which chairs the
rod rests, .and‘ the present invention relates
to an'improved chair of this type.
in Cir
20
The present improved chair consists of three
simple lengths of wire welded'togetherso as to
of the supporting member 4, usually adjacent
opposite ends of this .member. The members
2 and 3 extend outwardly and downwardly at
respectively opposite sides of the vertical plane
in which legs 5 and 6 are located, the angles of
i)
inclination ofthese members 2 and S‘preferably
being substantially equalas indicated at b‘ and b’
in Fig. 1. The lengths of these members 2 and
3 beneath the supporting member 4 are sufficient
to rest on’ the same ‘supporting surface as the
main legs 5 and 6, thus forming a pair of aux
iliaryrlegs l and 8.
>
It will also, be noted that each leg 1 and 8'
inclines downwardly and inwardly relative to the
form a four-legged supporting device having a
adjacent main leg 5 or 5,‘.and with respect toan '
wide-spread substantial base and an upwardly
projecting yoke to hold the reinforcing rod‘in
intermediate vertical plane at right angles to
supporting member Q, as ‘indicatedv at c in Fig. 2.
This brings the feet 1' 'and'8f at the bottoms of 20
place.
_ f
a
The principal object of this invention‘ is to
provide an improved chair of the type herein
above'brie?y described and disclosed more in
detail in the speci?cations‘ which follow.
Another object is to provide an improved chair
25
formed of connected ‘wires.
,
Another object is‘to provide a chair of this
type which is simple and economical in construc—
tion, while possessing adequate strength and a
30 stable and rigid form.
Other objects and advantages of this inven
tion will be more apparent from the following'
detailed description of one approved form of the
device constructed and operating according to
the principles of this invention.
In the accompanying drawing: ‘
'
Fig. 1 is a side elevation of a section of a rein
forcing rod supported by two of the improved
chairs, each chair being shown in end ‘elevation.
4.0
The two auxiliary members 2 and 3 ‘are weld
ed or otherwise suitably secured to opposite sides
Fig. 2 is a side elevation of one of the chairs;
Fig. 3 is a perspective view of one of the chairs.
The improved chair, in the form here shown,
consists of three lengths i, 2 and 3 of rather
heavy wire, or metal rods of rather small diame
ter.
The‘ main and longest member l>is bent
into a bow-shape consisting of an intermediate
substantially horizontal supporting member 4,
and two similar downwardly‘extending legs 5 and
6. The legs 5 and 6 preferably diverge down
50 wardly from one another so as to form suitable
angles (see a Fig. 2) with the vertical. This
gives a wider spread and increased stability to
the chair. The legs 5 and 6 are both positioned
in the same plane, preferably a vertical plane as
55 best shown in Fig. 1.
auxiliary legs ‘I ‘and 8‘ substantially in trans
verse alignment with ‘one another so that the
foot 1’ will be substantially equally spaced from
the main feet 5’ and B’ at the lower ends of legs
5 and 5.
In the same manner foot 8' is sub
'stantially equally spaced from the feet 5’ and 6’,
and preferably about thesame spacing exists
between the two feet 1' and 8’. In this manner
a widespread four point suspension is provid
ed so that the chair is quite stable and rigid and 30
cannot readily be tipped over in any direction.
It may also be noted that the wire or rod from
which the members is formed is cut off rather '
sharply and since the legs are all inclined to the
vertical, the feet at the lower ends of these legs
will tend to dig into the wooden surface on which
they rest and thus prevent displacement of the
chair when once positioned.
The upper end portions of the substantially
straight auxiliary members I and 2 preferably 40
project upwardly beyond the supporting member
4 to form short arms 9 and I0.
These arms 9
and I0 form, together with the intervening por
tion of supporting member 4, a yoke between
which the supported rod is positioned, as indi
cated at H in Fig. 1. It will‘ be understood
that the chairs might be turned at an angle to
the positions indicated in Fig. 1 so that rod ll
would be clamped in place between arms. 9 and
E0, in the event that the rod H is of less diame
ter than the space between arms 9 and I0.
It will be apparent that with a chair of this
type rather large and heavy supporting rods,
either round or rectangular, or hollow pipes can,
be accommodated in the yoke at the top of the 55.
2
2,134,533
chair. In former chairs of this general type it
has been customary to provide a downwardly
extending dip or recess by suitably bending the
Wire cross member in order to accommodate cer
tain square or rectangular rods. This necessie
tates an excessively wide cross-member. In the
present construction this recess is simply pro
vided by the upwardly projecting ends 9 and
I 0 of the auxiliary leg members, and no excessive
width of cross member 4 is necessitated.
It will be apparent that this chair can be very
simply and economically constructed. No bend
ing operations whatever are required for the
straight leg members 2 and 3, and the main mem
of the vertical plane of the ?rst member, the
upper ends of said auxiliary members extending
above the supporting member and forming, with
the intervening portion of the cross member, a
yoke for receiving and supporting a reinforcing
rod.
2. A chair for supporting a reinforcing rod in
concrete construction, said chair comprising a
length of wire bent to form an intermediate upper
supporting member and a pair of legs extending
downwardly and outwardly in a vertical plane
from the ends of said supporting member, and a
ber I only requires two simple and similar bends.
pair of substantially straight auxiliary lengths of
This main intermediate member is of a type that
can also be 'used in many other structural forms,
so that the number of dies required is minimized.
The height of the chair can be varied by simply
increasing or decreasing the lengths of the sev
wire welded near their upper ends to the support
sides of the vertical plane of the ?rst member and g
eral leg members, the bending angles remaining
each auxiliary leg also being inclined opposite to
constant, therefore the same assembly jig can be
used for holding the member during the spot
the adjacent leg of the ?rst-mentioned pair so
that its lower end will be spaced substantially
welding operation.
Since the auxiliary members 2 and 3 are simply
straight lengths of wire, and since chairs of var
ious height are required, there is practically no
waste of material. Even the shortest wire lengths
will be suitable for use in certain of the smaller
chairs. No great accuracy is necessary in cut
ting the lengths of the auxiliary members 2 and
3. These auxiliary members are adjusted in rela
tion to the main leg members 5 and 6 so that all
legs will be of the same length, and then the
welding operation is performed. Any variation in
length can go into the upwardly projecting arms
9 and I0 forming the yoke, where ordinarily such
variation will be unimportant.
40
leg members extending downwardly at substan
tially equal angles at respectively opposite sides
I claim:
1. A chair for supporting a reinforcing rod in
concrete construction, said chair comprising a
length of wire bent to form an intermediate upper
ing member at spaced apart locations and form
ing leg members extending downwardly at sub
stantially equal angles at respectively opposite
equally from the lower ends of the ?rst men
tioned pair of legs.
3. A chair for supporting a reinforcing rod in
concrete construction, said chair comprising a
length of wire bent to form an intermediate upper
supporting member and a pair of legs extending
downwardly and outwardly in a vertical plane 30
from the ends of said supporting member, and a
pair of substantially straight auxiliary lengths of
wire welded near their upper ends to the support
ing member at spaced apart locations and form
ing leg members extending downwardly at sub
stantially equal angles at respectively opposite
sides of the vertical plane of the ?rst member
and each auxiliary leg also being inclined opposite
to the adjacent leg of the ?rst-mentioned pair so
that its lower end will be spaced substantially
equally from the lower ends of the ?rst mentioned
pair of legs, the upper ends of the auxiliary mem
bers extending above the supporting member and
forming, with the intervening portion of the sup
supporting member and a pair of legs extending
downwardly in a vertical plane from the ends of
$1 said member, and a pair of auxiliary lengths of ' porting member, a yoke for receiving and sup
porting a reinforcing rod.
wire secured near their upper ends to the cross
member at spaced apart locations and forming
FRANK D. REILAND.
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