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US 10,648,234 B2Granted
Step ladder
AssigneeTricam Industries, Inc.
InventorsJeff Skubic, Dennis D. Simpson, Ben Williams, Yongxue Lu
Life of this patent
Estimating the term…
Abstract
A ladder including a first frame, a second frame and a platform assembly. The first frame includes one or more fixed steps. The platform assembly includes a first platform pivotably coupled to the first frame, a second platform pivotably coupled to the first frame, a first linkage coupled between the second frame and one of the first platform and the second platform, and a second linkage coupled to the first platform and the second platform. The ladder is movable between a closed position and an open position.
Claims28
A ladder configured to be movable between a closed position and an open position, comprising:
- a first frame having a thickness;
- a second frame including a crossmember, the first frame and second frame pivotal at a hinge;
- a platform assembly, including:
- an upper platform pivotably coupled to the first frame and having a stepping surface;
- a lower platform pivotably coupled to the first frame, the lower platform having a stepping surface and a side extending from a perimeter of the stepping surface, wherein the upper platform is pivotably coupled to the first frame at a location closer to the hinge than a location where the lower platform is pivotably coupled to the first frame;
- a linkage bar coupled directly between the second frame and the side of the lower platform;
- and a tie bar coupled directly to the lower platform;
- and a fixed step non-pivotably coupled to the first frame, the fixed step having a stepping surface and being arranged below the platform assembly, the fixed step extending beyond the thickness of the first frame in a direction toward the second frame and the fixed step not extending beyond the thickness of the first frame in the opposite direction, wherein the fixed step is configured to be positioned wholly within a boundary defined by the thickness of the first frame and a thickness of the second frame when the ladder is in the closed position, wherein the linkage bar is movable with respect to both the lower platform and one of the first frame or second frame when the ladder is moved between the closed position and the open position, wherein the stepping surfaces of the upper platform, lower platform and fixed step are generally parallel to one another when the ladder is in the open position, and wherein the upper platform rests on the crossmember and the tie bar does not extend above the upper platform or below the lower platform when the ladder is in the open position.
5 more elements
A ladder configured to be movable between a closed position and an open position, comprising:
- a first frame having a first thickness;
- a second frame having a second thickness, the first frame and second frame pivotal at a hinge;
- a platform assembly, including:
- an upper platform pivotably coupled to the first frame and having a stepping surface;
- a lower platform pivotably coupled to the first frame, the lower platform having a stepping surface and a side extending from a perimeter of the stepping surface, wherein the upper platform is pivotably coupled to the first frame at a location closer to the hinge than a location where the lower platform is pivotably coupled to the first frame;
- a linkage bar coupled directly between the second frame and one of the upper platform and the side of the lower platform;
- and a tie bar coupled directly to the lower platform;
- and a fixed step non-pivotably coupled to the first frame, the fixed step having a stepping surface and being arranged below the platform assembly, the fixed step extending beyond the first thickness of the first frame in a direction toward the second frame and the fixed step not extending beyond the first thickness of the first frame in an opposite direction, wherein the side of the lower platform extends downward from the perimeter of the stepping surface and the tie bar does not extend above the upper platform or below the lower platform when the ladder is in the open position, wherein the stepping surfaces of the upper platform, lower platform and fixed step are generally parallel to one another when the ladder is in the open position, and wherein the fixed step is configured to be positioned wholly within a boundary defined by the first and second thicknesses when the ladder is in the closed position.
5 more elements
Dependencies are inferred from the claim text.