US2212680A

US2212680A - Load transfer device

Info

Publication number: US2212680A
Application number: US232201A
Authority: US
Inventors: Alan E Brickman; George A Gleason
Original assignee: American Steel and Wire Company of New Jersey
Current assignee: American Steel and Wire Company of New Jersey
Priority date: 1938-09-28
Filing date: 1938-09-28
Publication date: 1940-08-27
Anticipated expiration: 1957-08-27

Description

f A8- 27, l940- A. E. BRICKMAN ET AL I LOAD TRANSFER DEVICE 4 Original Filed Aug. 50, 1937 4, me-,46cm

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-d mi Patented Aug. .27," 1940 UNITED STATES PATENT `OFFICE v Y y 2,212,680 l l vf Y roAD TRANSFER DEVICE Alan E. Brickman, Rostravor Township, Westmoreland County, Pa., and George A. Gleason, ,Worcestelg Mass., assignors to The American continuation/f application serial No. 161,685,

August 30, 1937.

This application September 28, 1938, Serial No. 232,201

, 1:8l claims. (o1. sli- 18) The present invention relates to a load transfer device for transverse joints in concrete roadways, walks and the like.

An object of` this' invention is to provide a load transfer device across a joint in a concrete road- Figure 4, to the main body portion to form resilient wings Ill for properly aligning the dowel devicein relation to the filler and, if necessary, to provide a yieldable'condition to obtain a more rigid assembly. One of the wings i) of each way or pavement havingicomplementary units, of Cover plate or housing is bent laterally to form a s identical construction, 'for movement relative to Hnge I2 extending backwardly in a plane parallel each other upon `the expansion and contraction to the main body DOrtion of said cover plates or of the, roadway er, pavement, housings, and thus alfords a means for disengag-V other objects and advantages will become apins the pawl and rack to make initial adiust' 10 parent as the description proceeds, and reference ments, il' desired. Opened end dowel receiving is made to the accompanying drawing, in which: DOCkets I4 of a depth not less than the length of Figure l is a side elevation of the presentinvensaid dowel portion 4' and within which the dowel -tion in position at a joint in a concrete roadway portions 4' of said dowel plates 4 are adapted to or pavement; slide relative to each other are formed by the l5 Figure 2 is a section on the line II-II of dowel plates 4, housings E and half-oval plates Figure 1; 2 and 3. The horizontal edges of the dowel Figure 3 is a section on the line III- III of portion 4' of each dowel plate 4 are in slidable Figure l; and contact with, the horizontal edges I4' of said dowel Fig. 4 is a view similar to Fig. 2 showing the receiving pockets I4 andthereby provide means 2'0 free ends of each housing bent outwardly towform for transferring the loads from one concrete slab resilient wings. to the adjacent slab so thatthe surface upon Referring more particularly to the drawing, which vehicles travel is maintained in substantial the load transfer device of the present invention alignment across the transverse joint and will includes two complementary units, designated permit expansion and contraction of the concrete 25 generally at A and B, said unitsbeing identical slabs. The dowel plates are Secured, in any conin construction. ventional manner, to one wall of said housings in Each unit forming one-half of the transload such a manner that, upon projection into the device comprises two nubbed halfoval plates 2 pocket-of the adjacent unit, there is provided and 3maintained in spaced relation to each other a space within which is placed an elastic filler 30 by dowel plates 4 with the fiat races of said plates l5 to complete ,the unit load transfer assembly. 2 and 3 facing each other, said dowel plates A COnventiOIial' type J'Oint filler material I3 iS being resistance welded (or otherwise secured in provided with slots ofv correct dimension at suitany conventionallmanner) to the nubs 'l on said ably spaced intervals in order to receive the load half-ovals 2 and 3. The half-ovals have their transfer unit assembly when DOSitOned t0 re- 35 ends 6 bent laterally from the normal horizontal ceive the concrete.. The dowel plate of one unit plane of said ovals so as to ferm, with the nubs. is inserted through the desired slot in the filler, l, a good bond in the concrete sections. while the dowel plate of the complementary unit The dowel plates 4 are each provided with a. is inserted from the opposite side of the filler 40 dowel portion 4' provided with a rack 5 which is through the same slot. The dowel plates of each` 40 cut or stamped therein. Cover plates or housings unit A and B mate with the pockets formed by said 8, of spring-like metal are welded, in any conhousings. Pressure is applied so that the winged ventional manner' to said dowel plates and are ends of said housings are in firm contact with the provided with a pawl 9 adapted to engage said filler material I3. The pawl andrack of each` racks Sand cooperate therewith to provide means unit engage each other to form a catch and 45 for initially holding the complementary units, provide means forinitially holding the units in forming the joint assembly in -proper position proper position. The units comprising the transupon the roadbed until the poured concrete has fer device are usually positioned about midwayl set. After the load transfer device has become of the Width of the filler and -at suitably spaced embedded in the concrete, the cooperative action intervals. lThe load transfer device is usually 50 ofthe pawl and rack may become inoperative by supported, during installation, by a bulkhead `shear through subsequent relative movement of plate (not shown) and pinned to the subgrade the concrete. vto withstand the flow of wet concrete used in f" 2 The free ends of ,each cover plate or housing 8 forming the roadway or pavement, after which are bent outwardly on an angle, as shown in the bulkhead plate and pins are removed and the 55 assembly appears as shown in Figure 1. Under lthe construction hereinabove described, there is lforms load transfer bearings for the vertical dowels while the latter, being vertical and loperating transversely, provides the greatest strength for the amount of material used and permits two like units to be used in the assembly.

The present application is a continuation of i an application filed by us August 30, 1937, Serial Number 161,685.

While we have shown and described a specific i,

embodiment of the invention, it will be under-l stood that we do not wishsto be limited exactly thereto since various modications may be made thereto without departing from the scope of the invention, as dened by the following claims.

We claim:

l. A load transfer device for roadway Ijoints comprising vertically positioned complemental units aligned in spaced relation to each other transversely of the roadway joint and provided with dowel receiving pockets, a dowel extending outwardly beyond the end of the pocketl of each unit and arranged in reverse slidable contact with each other and slidably tting into the pockets-of the respective units and means on said units for anchoring said units within the concrete. l

2. A load transfer device for roadway joints comprisingY vertically positiogzd complemental structural units spaced in aligned relation to each"jc'ither at the roadway joint, dowels carried by each unitl and arranged in reverse slidable contact with each other, dowel receiving pocketsV formed on each structural unit for slidably receiving the dowel Vof the complemental uni-t and means carried by each unit for anchoring said. units within the concrete.

3.5`A load transfer device for roadway joints comprising vertically positioned complemental structural units spaced in aligned relation -to each other at the roadway joint, dowels -vcarried by each unit and arranged in reverse slidable contact with each other, dowel receiving pockets .formed on each structural unit for slidably receiving the dowel of the complemental unit and means for initially restraining displacement of the dowel of oneunit from the dowel receiving` pocket of the other unit. f

4. A load transfer device for roadway joints comprising. complemental structural units spaced l in aligned relation to each other at the road-v way joint, vertically positioned dowel plates carried by each unit and arranged in reverse slidable contact with each other, a dowel receiving pocket of a depth substantially corresponding to the verticalv dimension of said dowel formed on each structural unit for slidably receiving the dowel l .i 'of the complemental unit and an elastic illler `member positioned within the space between the aeiaeso each. unit and arranged in reverse slidable contact with each other, a dowel receiving pocket of a depth substantially corresponding to the vertical 4dimension of said dowel formed on each structural unit for slidably receiving the dowel of the complemental unit. l

6. A load transmission joint for concrete roadways and pavements comprising vertically positioned complementary units, said units including spaced-plates, dowel-plates welded to said spaced-plates, cover-plates for said dowel-plates, each of said dowel-plates secured to and extending beyond the free ends of each of said coverplates and slidable in a plane perpendicular to the roadway within a pocket formed in the other complementary unit, and means for initially holding the complementary units together during the pouring of the concrete.

7. In a load transmission joint for concrete roadways and pavements, complementary units positioned vertically between adjacent concrete slabs, said complementary-units including plates dowel extending beyond the end of said cover-- plate and into slidable contact with the dowel receiving pocket of the adjoining complementary unit and means on said cover-plate and dowels for initially holding said complementary units together during the pouring of the concrete and permitting expansion andlcontraction thereof.

8. A load transfer device for the adjacent ends of concrete slabs. comprising vat least two clongated force transmitting members embedded in the slabs and longitudinally disposed inV transverse relation across and substantially at right angles to the joint between the ends of the slabs,l said members being disposed. on edge in vertical planes in the concrete and one having horizontally projecting flanges engaging and embracing the edges of the other to preventrelative vertical movement therebetween and ,between the ends of the slabs, while permittir'grelative longitudinal movements ony horizontal lines.

9. A load transfer device'fc'r the `adjacent ends of concrete slabs, comprising afpairvof similar, mating plates standingfon edge andeach having .a portion embedded'in the concrete adjacent one end of the slab, the embedded portion of each plate comprising horizontal Aanges land spaced vertical walls connected thereto, forming a socket and excluding-.the vconcrete from the lnvterior thereof, eachgplate including 'a longitudinally extending, forwardly projecting end `portion disposed transversely across and bridging Vthe space between the slabs and disposed in the socket vof the other, between and embraced by the horizontal flanges of the latter, to preventrelative transverse movement of the members in a-vertical plane, while permitting relative .longif tudinal movement on horizontal lines.

10. A load' transfer device for the adjacent ends of concrete slabs, comprising a pair of similar,

mating members longitudinally disposed transversely'across the joint between the slabs and each anchored in one slab, each member com-l prising a horizontally extending, elongated plate lying in a vertical plane and having laterally projecting, horizontal flanges along one portion, closely embracing and mating with the side edges of the other end of the other member.

l1. A load transfer device for the adjacent ends of concrete slabs, comprising a pair of similar, mating members longitudinally disposed transversely across the joint between the slabs, each member comprising a .plate lying in a vertical plane, having one 'portion provided with plates standing on edge, each of said plates having a portion embedded in the concrete at one end of a slab and a forwardly projecting portion extending across the joint and into the other slab, said embedded portion of each plate having a pair of horizontal flanges projecting toward the juxtaposed, forward portion of the other plate and closely embracing the top and bottom edges thereof to prevent relative vertical movement between the plates and between the adjacent slab ends.

13. A load transfer device for the adjacent ends of concrete slabs, comprising a pair of longitudinally arranged, juxtaposed, elongated plates standing on edge, each of said plates having a portion embedded in the concrete at one` end of a slab and a forwardly projecting portion extending across the joint and into the other slab, said rear portion having a pair of horizontal fianges projecting toward the juxtaposed, forward portion of the other plate and embracing the edges thereof to prevent relative vertical movement between the plates and between the adjacent slab ends, and a shield plate associated with said flanges and disposed to shield the Iorward portion of the other plate from contact with the concrete.

ALAN E. BRICm/LAN.

GEORGE A. GLEASON.