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| Number | Title | Issue Date |
| 7516817 | Ladder with knee brace and method A knee brace for a ladder including a first flange and a second flange. The brace includes a web extending from the first flange and the second flange which together form a u-shaped cross-section. The brace includes a first portion that connects to a step. The brace... | 04/14/2009 |
| 6142255 | Ladder, member for connecting a rail to a horizontal element of a ladder, and method A member for connecting a rail to a horizontal element of a ladder. The member comprises a first portion that connects to the horizontal member. The member also comprises a second portion which connects to the rail and extends essentially in parallel with... | 11/07/2000 |
| 5727647 | Appratus and method for providing increased deflection resistance to a plank A brace is provided for providing increased deflection resistance to a primary plank wherein the brace includes a frame member having an upper portion and a lower portion. The upper portion is adapted for supported and maintaining a primary plank in a fix... | 03/17/1998 |
| 5636706 | Ladder, member for connecting a rail to a horizontal element of a ladder, and method A member for connecting a rail to a horizontal element of a ladder. The member comprises a first portion that connects to the horizontal member. The member also comprises a second portion which connects to the rail and extends essentially in parallel with... | 06/10/1997 |
| 4984656 | Brace for scaffolding plank The beam deflection resistance of a scaffolding plank is increased by removably positioning at least one secondary plank along the longitudinal axis of the primary plank and securing the secondary planks in position with the brace of the present invention... | 01/15/1991 |
| 4244760 | Fixing of ends of wood or reinforced plastic rungs into pultruded fibreglass reinforced plastic extension ladder stiles without the use of metal Extension ladders constructed of pultruded fibreglass reinforced plastic for use in an high voltage electrical environment are improved when they do not have any metal components within the field of the induced electrical currents and to achieve the junct... | 01/13/1981 |
| 4079814 | Stepladders Stepladders are made of extruded aluminum metal parts including special bracket members for the rear prop section and the bucket rack that mitigate torsional twist. Cross bracings for the rear prop section and bracings of the front section are structured ... | 03/21/1978 |
| 4049082 | Structural member for a structural frame A structural member for a structural frame comprises a substantially planar wall and two opposing irregular-shaped sidewalls integral with the planar wall. Each irregular-shaped sidewall has a corrugation. The member has two free ends where the portion ad... | 09/20/1977 |
| 3986579 | Stairway construction An inclined pair of stringer beams carries a plurality of transverse steps supported on saddles secured to the stringers. The upper tread surfaces of the steps are planar whereas the lower surfaces are arcuate, with a predetermined radius of curvature mat... | 10/19/1976 |
