Concrete slab load transfer apparatus and method of manufacturing same

Patent metadata

Field	Value
Publication number	US-10837144-B2
Application number	US-201916279368-A
Country	US
Kind code	B2
Filing date	Feb 19, 2019
Priority date	Mar 9, 2018
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

Various embodiments of the present disclosure provide a cast-in-place concrete slab load transfer apparatus and method of manufacturing same. In various embodiments, the concrete slab load transfer apparatus includes a plurality of load transfer dowels each having a top surface and a bottom surface, a basket supporting the load transfer dowels, and a plurality of welds including a plurality of breakable welds connecting the bottom surfaces of the load transfer dowels to the basket.

First claim

The invention is claimed as follows:

1. A concrete slab load transfer apparatus comprising:
a plurality of load transfer dowels each having a top surface and a bottom surface;
a basket supporting the load transfer dowels, the basket including a first leg and a second leg; and
a plurality of welds including a plurality of breakable welds connecting the bottom surfaces of the load transfer dowels to the first leg and the second leg of the basket, wherein for each of the plurality of load transfer dowels, the welds include a line weld and one of the breakable welds in the form of a spot weld.

2. The concrete slab load transfer apparatus of claim 1 , wherein each of the plurality of dowels are only attached to the first leg and the second leg by the weld.

3. The concrete slab load transfer apparatus of claim 2 , wherein the first leg includes an elongated lower member, an elongated upper member, and a plurality of spaced apart member connectors connecting the elongated lower member and the elongated upper members.

4. The concrete slab load transfer apparatus of claim 3 , wherein the second leg includes an elongated lower member, an elongated upper member, and a plurality of spaced apart member connectors connecting the elongated lower member and the elongated upper members.

5. The concrete slab load transfer apparatus of claim 4 , wherein the plurality of welds including the plurality of breakable welds connect the bottom surfaces of the load transfer dowels to the elongated upper member of the first leg and the elongated upper member of the second leg.

6. The concrete slab load transfer apparatus of claim 5 , wherein each of the breakable welds attaching one of the dowels to the basket enable separation of that dowel from the basket after installation.

7. The concrete slab load transfer apparatus of claim 1 , wherein each of the breakable welds attaching one of the dowels to the basket enable separation of that dowel from the basket after installation.

8. The concrete slab load transfer apparatus of claim 7 , wherein for a first one of the load transfer dowels, one of the welds attaching the first load transfer dowel to the first leg is the spot weld and one of the welds attaching the first load transfer dowel to the second leg is the line weld.

9. The concrete slab load transfer apparatus of claim 8 , wherein for a second one of the load transfer dowels, one of the welds attaching the second load transfer dowel to the first leg is the line weld and one of the welds attaching the second load transfer dowel to the second leg is the spot weld.

10. A concrete slab load transfer apparatus comprising:
a plurality of load transfer dowels each having a top surface and a bottom surface, the plurality of load transfer dowels including a first dowel, a second dowel, a third dowel, and a fourth dowel;
a basket supporting the load transfer dowels, the basket including a first leg and a second leg, the first leg having an upper member and a lower member, and the second leg having an upper member and a lower member; and
a plurality of connections connecting the bottom surfaces of the load transfer dowels to the basket, said plurality of connections including a plurality of breakable connections, wherein the first dowel is connected to the first leg by one of the plurality of connections and connected to the second leg by one of the plurality of the breakable connections,
wherein the second dowel is connected to the second leg by one of the plurality of connections and connected to the first leg by one of the plurality of breakable connections,
wherein the third dowel is connected to the first leg by one of the plurality of connections and connected to the second leg by one of the plurality of breakable connections, and
wherein the fourth dowel is connected to the second leg by one of the plurality of connections and connected to the first leg by one of the plurality of breakable connections.

11. A method of manufacturing a concrete slab load transfer apparatus, said method comprising:
(a) positioning a plurality of load transfer dowels on a surface, the plurality of load transfer dowels each having a first end and a second end, wherein the first end is wider than the second end;
(b) positioning a basket and specifically first and second legs of the basket above and adjacent to the plurality of load transfer dowels; and
(c) attaching the first and second legs to the plurality of load transfer dowels by a plurality of welds including a plurality of breakable welds, wherein for each of the plurality of load transfer dowels, the welds include a line weld and one of the breakable welds in the form of a spot weld.

12. The method of claim 11 , which includes positioning the first and second legs adjacent to bottom surfaces of the load transfer dowels before forming the welds.

13. The method of claim 11 , wherein each of the breakable welds attaching one of the dowels to the basket enable separation of the dowel from the basket after installation.

14. The method of claim 11 , wherein for a first one of the load transfer dowels, one of the welds attaching the first load transfer dowel to the first leg is the spot weld and one of the welds attaching the first load transfer dowel to the second leg is the line weld.

15. The method of claim 14 , wherein for a second one of the load transfer dowels, one of the welds attaching the load transfer dowel to the first leg is the line weld and one of the welds attaching the load transfer dowel to the second leg is the spot weld.

Assignees

• Illinois Tool Works

Inventors

• Rodden Robert Alan
• Ali Zafar Imtiaz
• St Louis Matthew Douglas
• Riffle Randall Derek
• Kao Eddie
• Hall Jimmy Lee

Classifications

• E04B2103/02

  of ceramics, concrete or other stone-like material · CPC title

• E04B5/32

  Floor structures wholly cast in situ with or without form units or reinforcements · CPC title

• E01C11/06

  Methods of making joints · CPC title

• E04C5/163

  the reinforcements running in one single direction · CPC title

• E04C5/0604

  Prismatic or cylindrical reinforcement cages composed of longitudinal bars and open or closed stirrup rods (E04C5/0631 takes precedence) · CPC title