Undergrate stairway access assembly
First Claim
1. A portable stairway comprising:
- one or more step structures and a guardrail structure;
wherein the portable stairway is adapted for use with an opening in a supporting surface;
wherein the portable stairway is configured to allow a person to safely traverse between different levels through the opening in the supporting surface;
wherein the portable stairway is configured to prevent a person from falling through the opening in the supporting surface;
wherein the guardrail structure comprises a base structure, a first guard, a second guard, a third guard, a fourth guard, a first crossbar, a second crossbar, a first hinge, a second hinge, a third hinge, a fourth hinge, and a plurality of brackets;
wherein the base structure is a flat rectangular structure with a hollow center;
wherein the base structure further comprises a first strip, a second strip, a third strip and a fourth strip;
wherein the first guard is a U shaped structure;
wherein the second guard is a U shaped structure;
wherein the first guard further comprises a first metal tube, a second metal tube, and a third metal tube;
wherein the second guard further comprises a fourth metal tube, a fifth metal tube, and a sixth metal tube;
wherein the first metal tube is further defined with a first end and a second end;
wherein the second metal tube is further defined with a third end and a fourth end;
wherein the third metal tube is further defined with a fifth end and a sixth end;
wherein the fourth metal tube is further defined with a seventh end and an eighth end;
wherein the fifth metal tube is further defined with a ninth end and a tenth end;
wherein the sixth metal tube is further defined with an eleventh end and a twelfth end;
wherein the first end is attached to the second strip using the first hinge;
wherein the third end is attached to the second strip using the second hinge;
wherein the ninth end is attached to the fourth strip using the third hinge;
wherein the seventh end is attached to the fourth strip using the fourth hinge;
wherein the sixth end is joined to the second end;
wherein the fifth end is joined to the fourth end;
wherein the twelfth end is joined to the eighth end;
wherein the eleventh end is joined to the tenth end;
wherein the first hinge and the second hinge are installed such that the first guard will rotate towards the hollow center of the base structure;
wherein the third hinge and the fourth hinge are installed such that the second guard will rotate towards the hollow center of the base structure;
wherein the third guard is a U shaped structure that is formed from a single hollow metal tube;
wherein the fourth guard is a U shaped structure that is formed from a single hollow metal tube;
wherein the third guard is further defined with a thirteenth end and a fourteenth end;
wherein the fourth guard is further defined with a fifteenth end and a sixteenth end;
wherein an outer diameter of the third guard is less than an inner diameter of the first metal tube;
wherein the outer diameter of the third guard is less than the inner diameter of a second metal tube;
wherein an outer diameter of the fourth guard is less than an inner diameter of the fourth metal tube;
wherein the outer diameter of the fourth guard is less than an inner diameter of the fifth metal tube;
wherein each of the one or more step structures comprises a first stringer, a second stringer, a plurality of treads, a first terminus, a second terminus, and a pivot bar.
0 Assignments
0 Petitions
Accused Products
Abstract
The undergrate stairway access assembly is a portable stairway designed to provide safe access to different levels through temporary openings in supporting surfaces such as floors and sidewalks. Specifically, the undergrate stairway access assembly is an assembly comprising an integrated guardrail and step structure that allows a worker to safely traverse between different levels through openings in the supporting surface while preventing workers from inadvertently falling through these openings. The undergrate stairway access assembly is ideal for providing protection for projects that require the removal of grated surface protections such as sidewalk grates, sewage grates or undercarriage bays. The undergrate stairway access assembly comprises one or more step structures and a guardrail structure.
52 Citations
13 Claims
-
1. A portable stairway comprising:
-
one or more step structures and a guardrail structure; wherein the portable stairway is adapted for use with an opening in a supporting surface; wherein the portable stairway is configured to allow a person to safely traverse between different levels through the opening in the supporting surface; wherein the portable stairway is configured to prevent a person from falling through the opening in the supporting surface; wherein the guardrail structure comprises a base structure, a first guard, a second guard, a third guard, a fourth guard, a first crossbar, a second crossbar, a first hinge, a second hinge, a third hinge, a fourth hinge, and a plurality of brackets; wherein the base structure is a flat rectangular structure with a hollow center; wherein the base structure further comprises a first strip, a second strip, a third strip and a fourth strip; wherein the first guard is a U shaped structure; wherein the second guard is a U shaped structure; wherein the first guard further comprises a first metal tube, a second metal tube, and a third metal tube; wherein the second guard further comprises a fourth metal tube, a fifth metal tube, and a sixth metal tube; wherein the first metal tube is further defined with a first end and a second end; wherein the second metal tube is further defined with a third end and a fourth end; wherein the third metal tube is further defined with a fifth end and a sixth end; wherein the fourth metal tube is further defined with a seventh end and an eighth end; wherein the fifth metal tube is further defined with a ninth end and a tenth end; wherein the sixth metal tube is further defined with an eleventh end and a twelfth end; wherein the first end is attached to the second strip using the first hinge; wherein the third end is attached to the second strip using the second hinge; wherein the ninth end is attached to the fourth strip using the third hinge; wherein the seventh end is attached to the fourth strip using the fourth hinge; wherein the sixth end is joined to the second end; wherein the fifth end is joined to the fourth end; wherein the twelfth end is joined to the eighth end; wherein the eleventh end is joined to the tenth end; wherein the first hinge and the second hinge are installed such that the first guard will rotate towards the hollow center of the base structure; wherein the third hinge and the fourth hinge are installed such that the second guard will rotate towards the hollow center of the base structure; wherein the third guard is a U shaped structure that is formed from a single hollow metal tube; wherein the fourth guard is a U shaped structure that is formed from a single hollow metal tube; wherein the third guard is further defined with a thirteenth end and a fourteenth end; wherein the fourth guard is further defined with a fifteenth end and a sixteenth end; wherein an outer diameter of the third guard is less than an inner diameter of the first metal tube; wherein the outer diameter of the third guard is less than the inner diameter of a second metal tube; wherein an outer diameter of the fourth guard is less than an inner diameter of the fourth metal tube; wherein the outer diameter of the fourth guard is less than an inner diameter of the fifth metal tube; wherein each of the one or more step structures comprises a first stringer, a second stringer, a plurality of treads, a first terminus, a second terminus, and a pivot bar. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
Specification