| Patent Number |
Title Of Patent |
Date Issued |
| 4408195 |
Boundary plane warning system |
October 4, 1983 |
| A laser transmitter emits a beam which scans about a scanning axis to effect a curtain of light which defines a boundary of a working space. Photosensors mounted on the outboard portion of a crane or other construction equipment generate warning signals to the construction equipment |
| 4117738 |
Chain for engagement with double sprocket |
October 3, 1978 |
| A chain for engagement with a double sprocket has alternate pin links and center, or bushing, links. The bushing links comprise a single center bar with two laterally extending bushings tightly received therein. The pin links have side bars parallel to the center bars, and the side bars |
| 4036072 |
Welded steel roller chain |
July 19, 1977 |
| A roller chain that includes a series of alternately arranged roller links and pin links is manufactured by welding side bars to separately formed bushings and pins. Each roller link has a pair of laterally spaced side bars extending in a direction longitudinally of the chain. A pair of |
| 4020712 |
Bushing link chain |
May 3, 1977 |
| A blank, having a pair of parallel bushing forming strips that are intermediately connected by a web, is formed from stock. The blank is bent and curled in a progressive die to form a bushing link that includes a pair of cylindrical bushings integral with the web. Rollers can be slipped |
| 3931706 |
Method of making a bushing link chain |
January 13, 1976 |
| A blank, having a pair of parallel bushing forming strips that are intermediately connected by a web, is formed from stock. The blank is bent and curled in a progressive die to form a bushing link that includes a pair of cylindrical bushings integral with the web. Rollers can be slipped |
