Encyclopedia of Anchoring (CA06114E)

LOCKING-DOG ASSEMBLY The CHANCE Locking-Dog Assembly is another mechanical-anchor installing device that needs periodic inspection. When the Locking-Dog Assembly is correctly positioned and in good working order, it performs smoothly and freely ensuring complete and positive capture of the anchor-installing wrench drive tube and anchor rod. If locking dogs do not rotate smoothly or engage easily into the “in” and “out” positions, wrench and rod capture may not be correct. Under such circumstances, if dogs are worn or damaged, order new ones from CHANCE. When inspecting the Locking-Dog Assembly, check to see (above) the set screws holding the two-dog assemblies are in position. There are two. One below each “dog.” The innermost set screw is ½” x ⅝”. The outermost screw is ½” x 3⁄8”. Another portion of the Locking-Dog Assembly needing careful inspection is the square socket where the wrench drive tube is inserted (see photograph below). The socket can become worn from long term use and/or poor wrench drive-tube alignment. Under such circumstances, the drive-tool end can become damaged. By monitoring the 11⁄8” holes located at the top of the wrench-drive tube for wear, you can detect square socket wear that is beginning to damage the wrench. Drive tube wear at the 11⁄8” holes shows the Locking-Dog Assembly is picking up torsional load on the wrench-drive wall inside the holes. Such wear indicates you need a new Locking-Dog Assembly.

KELLY BAR

COIL LOCK

KELLY BAR ADAPTER

FLANGE FLANGE BOLT HOLES

LOCKING DOG ASSEMBLY

Locking Dog Housing

SET SCREWS

SQUARE SOCKET

B

1¼” WRENCH DRIVE-TUBE HOLES

Dog

½” x ⅝” Set Screw

½” x ⅜” Set Screw

Notice square socket wear on the Locking-Dog Assembly in the photograph below.

Kelly Bar Adapter

Torque Indicator

WORN

NEW

Locking Dog Assembly

Figure 3

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