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US 12,644,336 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.
Claims12
A ladder, comprising:
- a first frame;
- a second frame comprising a crossmember;
- a platform assembly, including:
- a lower platform comprising a stepping surface and pivotably coupled to the first frame;
- an upper platform comprising a stepping surface and pivotably coupled to the first frame;
- a linkage bar coupled between the second frame and the lower platform;
- a tie bar coupled to the lower platform and the upper platform or the first frame,
- wherein the ladder is configured to be movable between a closed position and an open position;
- and
- a fixed step having a stepping surface and being arranged below the platform assembly, the fixed step extending beyond a 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 combining 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.
7 more elements
A ladder, comprising:
- a first frame having a thickness;
- a second frame comprising a crossmember;
- a platform assembly, including:
- a lower platform comprising a stepping surface and pivotably coupled to the first frame;
- an upper platform comprising a stepping surface and pivotably coupled to the first frame;
- a linkage bar coupled between the second frame and the lower platform;
- and
- a tie bar coupled to the upper platform and the lower platform;
- wherein the ladder is configured to be movable between an open position and a closed position and wherein the platform assembly is configured to be positioned within a boundary defined by the thickness of the first frame when the ladder is in the closed position;
- and
- a 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 combining 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.
8 more elements
Dependencies are inferred from the claim text.