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Bat Signal Prop A Mechanism Description



The bat signal prop (figure 1) is a miniature replica of a signaling device. The bat signal prop evolved from the bat signal, which Batman uses to maintain his privacy while providing Gotham City with a method for alerting him of trouble. The bat signal prop is approximately 10 inches long, 12 inches wide, and 12 inches tall. The bat signal prop consists of several different materials such as plastic, sheet metal, and glass. The bat signal prop consists of five visible parts: lens, body, base, swivel mount, and handle.

Figure 1















Source:, Inc. 1996-2003. Toys & Games: Bat Signal Prop by Diamond Select. 10 July 2003. Internet:




The lens, made of glass, is a 9 inch diameter yellow-tinted disk with the silhouette of a bat painted on the exterior surface. The lens mounts to the open end of the body and creates the bat signal image when lit from behind.


The body, made of sheet metal, is a hollow, black dome with copper trim that is 9 inches in diameter and 6 inches deep. The body attaches to the swivel mount and houses the lens, light bulb, mirror, wiring, and battery box. The body pivots in the swivel mount to project the bat signal at varying angles.



The base, made of hard plastic, is a disk approximately 1 inch thick and 8 inches in diameter with feet protruding at regular intervals. The base connects to the swivel mount and provides the bat signal prop with a stable foundation.


Swivel Mount

The swivel mount consists of a hard plastic U-shape with three connection points. The swivel mount connects to the base at the bottom center of the U-shape with a 360o swivel coupler. The swivel mount connects to the body at the top of each arm of the U-shape with couplers that allow a 90o range of motion. The swivel mount gives the bat signal prop the ability to point in nearly any direction.



The handle, made of hard plastic, is a slender arced tube attached to the top of the body. The handle gives the user a method for transporting, swiveling, or tilting the bat signal prop.



Jay Lienhard

ENG 200, Technical Communication

Summer 2003