US1752327A - Dowel for concrete structures - Google Patents

Description

April 1930. B. BRIODY 1,752,327

DOWEL FOR CONCRETE STRUCTURES Filed Oct. 11, 1928 I INVENTOR. 9 Bernard Briod A TTORNEY Patented Apr. 1,1930

UNITED STATES.

PATENT OFFICE BERNARD BRIODY, or YOUNGSTOWN, OHIO, AssIGNoRTo TRUSCON STEEL coMrANY,

or YOUNGSTOWN, OHIO, A CORPORATION or MICHIGAN DOWEL FOR CONCRETE STRUCTURES Application filed October 11, 1928. Serial 1T0. 811,872.

In the construction of concrete roads, it has been found desirable in certain cases and under certain conditions to make them in sections, preferably in the form of reenforced 6 slabs. It has furthermore been found that in order to prevent these slabs heavin or becoming elevated at their edges one above the other, it is desirable to dowel them together. As these sections or slabs have a 10 certain amount of contraction and expansion,

the anchoring therein of the dowels has created stresses, causing undesirable fractures. The object of the present invention is to provide a dowel structure that will constitute an efl'ective holding means and at the same time will permit free expansion and contraction, said means moreover being readily utilizable with the joint-forming strips and being positively positioned in place during thepouring of the concrete.

A preferred embodiment of the inventlon is illustrated in the accompanying drawings, wherein:

Figure 1 is a plan view of a road section 26 indicating the dowel structures in place therein.

Figure 2 is a perspective view of a portion of the joint or parting strip and a dowel in place therein.

Figure 3 is a horizontal sectional view through the same.

Figure 4 is a view in elevation of the tubular section of the dowel.

Figure 5 is a cross sectional view on the 36 line 5-5 of Figure 3.

The roadway, as shown, is designated A and is made up of concrete sections or slabs B, forming joints C. These joints are ordinarily formed by a joint or parting strip of sheet metal, a portion of which is shown at 6 in Figure 2. This parting strip as is well known is placed on the sub-base of the roadway in vertical position, and the concrete is 5 poured against the opposite sides of the same.

It is preferably provided with a central 011- set 7 that forms a key which effects an interlock between the adjacent ends or edges of the two slabs or sections B. In the present embodiment this ofiset portion 7 is provided the chair constitute legs 12 that preferably a seat 11 that receives the ro The two parts are electrically welded at their points of intersection. The end portions ofthe rod of terminate in outturned feet 13. This chair, it will be understood, supports the rod section in substantially horizontal position.

On the opposite end portion of said rod section 9, and'therefore on the opposite side of the strip 6 to the chair is slidably mounted a tubular dowel section 14. This is preferably made of relatively light sheet metal, and has its outer portion tapered off to a fiat shape, said portion being bent downwardly to form a supporting leg 15. The tubular portion may have an inturned lug 16 stamped therefrom and constituting a stop against which the end of the rod section 9 is abutted.

In assembling the parts, it will be understood that the strip 6 is positioned on the sub-base and the rod sections 9 are passed through the openings 8 and supported by the chairs 1013. The tubular sections 14 are then telescoped on the free projecting ends of the rod sections and are in like manner supported by theirlegs 15. The dowels are thus firmly supported and will not become displaced by the action of the concrete when poured upon and around them. When the concrete has set, the dowels of course remain embedded therein, but any contraction or expansion can take lace freely without -resistance because the ee end of the dowl section 9 being enclosed in the tubular section 14, these parts can relatively slide on each other. Each, however is not only embedded in its respective rod section or slab, but is anchored therein by the. chair and le 15. Theiractioninpreventingthe-heavingo mo one slab above the other is moreover entirely eflicacious since no relative lateral movement can occur. This is for the' reason that the rod section is actually embedded in the meeting end portions of adjacent slabs, though housed within the tubular section 14.

From the foregoing, it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art, without further description, and it will be understood that various changes in the size, shape, proportion and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

What I claim, is:

1. A dowel structure for concrete roads and the like, comprising telescoping sections, each adapted to be embedded in adjacent con.- crete slab members, and supporting members secured to said sections and constituting permanent anchors therefor in the concrete.

2. A dowel structure for concrete roads and the like, comprising a rod section and a tubular section slidably telescoping the same, each of said sections having a supporting leg permanently connected thereto and permanently embedded in the concrete.

3. A dowel structure for concrete roads and the like, comprising a rod section, a su porting chair located transversely "of an permanently secured to the outer end portion of said rod section and having depending supporting and anchoring le and a tubular section slidably telescope on the free end portion of. the rod section and having a depending supporting and anchoring leg at its outer end permanently connected thereto.

4. A dowel structure for concrete roads and the like, including a rod member and a transversely disposed supporting chair comprising a transversel disposed inverted substantially U-shaped racket, permanently secured at its central ortion to the rod member, with the depen g end portions forming spaced supporting legs.

5. A dowel structure for concrete roads and the like, including a rod member and a transversely disposed supporting chair comprising a transversely did, inverted subra :et

stantiall U-shaped having a downwardly wed cross bar extendin beneath and secured to the end of the r member,

'to one end of the same, a tubular section slidably telescoping the other end of the rod sec tion and located on the opposite side of the parting strip to the chair, and a supporting leg for the outer end of the tubular section.

In testimony whereof, I aflix my si ature.

BERNARD BRI DY.

with the depending end portions forming spaced supporting legs.

6. In combination a partiitg strip provided with an opening and a owel comdpris: in a rod section, a tubular section sli ably eseoping the rod section, one of 'said sections passing through the opening in the parting strip, and means permanently secured to one of the members at one side of the partin strip for supporting the dowel during emfiedment in the concrete, said sup-

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