Patent Application
20190111780
Not Applicable
Not Applicable
Not Applicable
This tool pertains to the field of aftermarket automotive customization, an ever growing business in the USA and abroad. This tool removes guesswork in exact length needed from the process of building a custom length drive shaft. This tool was developed from the need for such a tool in my own shop.
The driveshaft measuring tool is beneficial to automotive fabrication shops and auto enthusiast, 4×4 and Hot Rod builders for the following reasons: It eliminates the need to take three separate measurements currently required in order to determine the exact length of the new drive shaft to be built, which required two people to achieve; this tool allows one person to measure for the drive shaft, thus requiring less labor, or in the instance of a one man shop, he can do it by himself. This tool gives the user the exact center of the front universal joint to the exact center of the rear universal joint measurement from 40 to 74 inches, taking all risk of cutting the driveshaft too short or too long out of the equation. Do it once, do it right.
Drawing 1, Dimensional
This drawing shows the dimensions of the individual components used to build the tool. The drawing also includes a view of the 36 inch section of self adhesive tape measure that is used to gauge the length of the drive shaft being measured.
Drawing 2, Components
This drawing shows the components used to build the tool
Item 1: 1 inch stock square tubing
Item 2: 4.5×2×1 inch end
Item 3: ⅛ inch round rod used for spacer
Item 4: 3.75 inch stock square tubing
Item 5: ¼×4.5×2×3.75 inch end
Item 6: Stock hardware 5/16-18×1¼ inch bolt
Not Shown: ½ inch wide self adhesive tape measure section used
Photo 1: Point of reference for exact drive shaft measurement, in this case 49% inches center to center of universal joints
Photo 2: Tool in place at rear universal joint
Photo 3: Tool in place at front universal joint
Photo 4: Tool set up in demonstration of use
The Drive Shaft Measuring Tool is constructed of one part being made from ½ inch square tubing, 36 inches long. There is a “horseshoe” end section made with ¼×¾ inch flat steel welded together with tapped holes on each side for the bolts to screw into to attach to the u-joint. This part is then welded to the shaft. This shaft section has a self adhesive tape measure attached to it giving the variable length measurement for the purpose of the tool.
The second part is made from 1 inch square tubing, also 36 inches long, that the first part slides into, resulting in a telescopic apparatus. The end design with the tapped bolt holes is made from 1 inch material and is then welded to the shaft. This section of the tool provides the measuring reference point.
There is a 3/16 rod utilized to take up the slack between the two sizes of tubing, resulting in a tighter, smoother operation. The rod is spot welded at the ends of the tubing to make it a permanent attachment.
NOTICE: You must have on hand the proper transmission slip yoke and u-joints for your application.
Attach slip yoke for the transmission with u-joint installed to the telescopic shaft with the tape measure on it, and rear u-joint to the other end of the Drive Shaft Measuring Tool. Attach by removing the two opposing grease caps on each u-joint, and screw the bolts on both ends of the tool into the open holes provided for grease.
The bolts will self center and hold the u-joints in the proper location for accuracy of measurement (see photo). Place slip yoke into transmission and seat until it stops travel. Extend Drive Shaft Measuring tool toward rear differential and place the rear u-joint in place at rear differential u-joint mounting flange and secure with proper straps or u-bolts.
Pull front slip yoke back out ¾ inch to 1 inch to allow for end travel. (User's discretion, this can vary) Read the number on the Drive Shaft Measuring Tool at the reference point where the tape measure meets the telescopic tube. This will be your correct driveshaft center to center u-joint measurement to use to build a driveshaft.
