US2505929A

US2505929A - Load transfer device

Info

Publication number: US2505929A
Application number: US583500A
Authority: US
Inventors: Yeoman Ray Cyrus
Original assignee: TEXAS FOUNDRIES Inc
Current assignee: TEXAS FOUNDRIES Inc
Priority date: 1945-03-19
Filing date: 1945-03-19
Publication date: 1950-05-02
Anticipated expiration: 1967-05-02

Description

May 2 1950 R. c. Yl-:oMAN

LOAD TRANSFER DEVICE Filed Maron 19, 1945 Patented May 2, 1950 4NITED STATES .PATENT ,QFFICl- Texas Foundries, `tion oi Texas Application March 19, 1%5, Serial No. 583,500

This invention relates to load transfer devices and more particularly to devices for transmitting loads between adjacent slabs of concrete` or the like. p One of the objects of the invention is to provide a load transfer device which will` maintain the slabs in vertical alinement and which will limit relativeseparation of the slabs. j

Another Objectis to provide a load transfer device made up of complementary members to be imbedded in the slabs respectively and which are connected for relative movement through one or more pins.

Still another object is to provide a load transfer device in which yielding material is arranged between the pins and the members to cushion relative movement thereof.

A. further Objectis to provide a load transfer member in the form of a sinuous strip having its rebent portions` so arranged that they will interlock. with complementary portions of adjacent strips.

The above and other objects and advantages will be more readily apparent `from the "following description when read in connection accompanying drawing in which- Figure 1 is a partial vertical section through a pair of adjacent slabs connected by a load transfer device embodying the invention;

Figure 2 is a partial horizontal section on line 2 2 of Figure l;

Figure 3 is a perspective view of a part oi one of the strips; Figure 4 is a view similar to Figure l of an alternative construction; and

Figure 5 is a horizontal section on the line 5-5 of Figure 4.

As shown in Figures l and 2, adjacent slabs Il! and Il of concrete or the like are arranged with a iiller strip I2 between their adjacent faces to close the space therebetween against ingress oi water or the like. The filler strip I2 may be made of any desired type of yielding material such as asphalt saturated felt, compressed wood or metal lic expansion joint structures. ller strip is formed by two separate strips spaced apart in the central portion of the slab to leave a space through which load transfer devices may extend.

The slabs are connected by a load transfer mechanism including identical metallic strips i3. The strips I3 are formed of relatively flat elongated strips of metal sinuously bent to provide rebent portions i4 and IE. The rebent portions I4 along one side of the member are formed with clanes.

with `the the i Preferably the (ci. sii-L) central slots I6 and the portions l5 are reduced in' Width to substantially the same widthas the slots.`"Preferably the portions I-t'a are slightly narrower thanthe'slots so that they will enter the "slots ina complementary member snugly. Vertical movement is thus held to minimum without preventing the limited horizontal movement.

shown, the rebent portion Id of one member projects from one of the slabs while the narrow portion i 5 of the other member projects from the through'the slots I5 to define vertical openings between the members. With this construction, a

vertical load oneitherof the slabsl will be transmitted to the other slab through interengagement of the rebent portions I5 with the sides of the slots I6. In this way the slabs are maintained in the same plane so that they will provide a smooth upper surface.

To limit separation of the slabs, pins Il of smaller diameter `than the openings between the members'aremounted in the openings' and preferably have enlarged heads l to limit movement thereof through the openings. In order to cushion the relative movement between the slabs and members sleeves I9 of yielding material, such as rubber or asphalt compositions, 'are arranged around the pins substantially to iill the openings. HAsbthe'slab faces tend to separate when the slabs contract under low temperatures, the members I3 tend to move apart to reduce the size of the openings dened by the rebent portions lli and l5. This action squeezes the yielding material I9 and if continued to a suflicient extent will squeeze the yielding material to the extent of its compressibility or may actually cause the rebent portions of the members to engage the metal pins i1. At this time, further separation of the slab faces will be prevented so that the slabs cannot move out of contact with the ller strips i2 to break the seal at the joint. It will be understood that the filler strips and load transrer members are so designed that they will ac commodate the maximum expected separation of the slab faces in response to changes of atmospheric conditions.

To provide for movement of the slab faces toward each other when the slabs expand, yielding plastic material 2D such as rubber, asphalt composition or the like is placed between the projecting portions of the strips and the opposite slab faces. This material may be placed in any desired manner but is advantageously secured to the strips to be held properly in place during installation. When the concrete is in plastic form the material 20 holds it out of direct contact with the metal of the strips and will yield when the slabs expand to permit their adjacent faces to move closer together.

Another construction embodying the invention is illustrated in Figures 4 and 5 for connecting adjacent slabs of concrete 2| and 22 which have an expansible iiller strip 23 between their adjacent faces, In this Construction, identical plate members 24 are imbedded in the slabs in a vertical position and may if desired be formed with openings 25 therethrough to assist in anchoring them in the slabs. The openings may be formed by partially punching out portions of the plates to leave anchoring ns as shown. The edge portions of the plates project beyond the respective slab faces and interfit as shown in Figure 4 so that they will transmit vertical loads between the slabs to maintain the upper surfaces thereof in the same piane.

In order to limit separation of the sla-b face the serrations on the projecting edges of the slabs are rolled around as shown at 26 to form registering openings through the serrations. A

pin 2l of smaller diameter than the openings extends through the openings and is preferably surrounded by a sleeve 28 of yielding material which substantially nlls the openings. Move ment of the slab faces together is provided for as in Figures 1 and 2 by yielding plastic material 29 overlying the outer ends of the serrations.

In use this construction operates in substantially the same manner as that of Figures 1 to 3. As the slab faces tend to separate the yielding material 29 will be squeezed until it has been compressed to its maximum extent or until the serrations Ee engage the pin 2l after which no further separation of the slab faces is possible.

While two embodiments of the invention have been shown and described in detail herein, it will be understood that these are illustrative only and are not intended as definition of the scope of the invention, reference being had for this purpose to the appended claims.

What is claimed is:

1. In combination with adjacent slabs of concrete or the like a load transfer device comprising a pair of sinuous strips imbedded in the slabs respectively with angularly rebent portions thereof projecting beyond the faces of the slabs, part of the projecting portions being formed with central slots therethrough and the other rebent portions being of a width to extend through the slots to define openings between the strips, and pins of smaller diameter than the openings tting through the openings.

2. In combination with adjacent slabs of concrete or the like a load transfer device comprising a pair of sinuous strips imbedded in the slabs respectively with angularly rebent portions thereof projecting beyond the faces of the slabs, part of the projecting portions being formed with central slots therethrough and the other rebent portions being of a width to extend through the slots to define openings'between the strips, pins of smaller diameter than the openings tting through the openings, and sleeves of yielding material around the pins substantially lling the openings.

3. In combination with adjacent slabs of concrete or the like a load. transfer device comprising a pair of sinuous strips imbedded in the slabs respectively with angularly rebent portions thereof projecting beyond the faces oi the slabs, part of the projecting portions being formed with central slots therethrough and the other rebent portions being of a width to extend through the slots to dei-lne openings between the strips, and

pins oi" smaller diameter than the openings iitv ting through the openings, the outer surfaces of the rebent portions being covered with yielding plastic material.

RAY CYRUS YEOMAN.

REFERENCES CITED The ioilowing references are of record in the lile of this patent:

UNITED STATES PATENTS Number Name Date 951,911 Lambert Mar. 1, 1910 1,393,699 Purcell Oct. ll,` 1921 1,859,664 Fulda May 24, 1932 1,975,281 Lumb Oct. 2, 1934 2,103,894 Bussrnann Dec. 28, i937 2,125,857 Fischer Aug. 2, 1938 2,166,220 Older July 18, 1939 2,280,455 Seuberling Apr. 21, 1942 2,319,049 Fischer' May 11, 1943 FOREIGN PATENTS Number Country Date 778,683 France 1935