LADDER SAFETY HANDRAIL

Abstract

A set of detachable base ladder safety handrails comprising: a pair of tubular cross-section handrails, wherein said handrails are made of metal, preferably aluminum, wherein one handrail is situated approximately one to a few inches away from the distal edge of one of the two ladder side rails, wherein a second handrail is situated approximately one to a few inches away from the distal edge of the second ladder side rail, wherein said pair of handrails are on or substantially on the same plane which ladder side rails and rungs connecting said ladder side rails lie, wherein said pair of handrails are parallel to each other and said ladder side rails, wherein a plurality of removable clamps is attached to each of said ladder side rails, wherein each of the said handrails is coupled to said plurality of removable clamps by a plurality of clamp-to-handrail links, wherein each clamp-to-handrail link is securely bonded, welded, or fastened to said clamp on one end and nearest handrail on said link's opposite end, wherein said clamp-to-handrail links are made of a solid circular, tubular, or thin shell cross-section and are preferably made from aluminum, wherein at least two clamps are attached to each ladder side rail and at least one clamp is attached near each of the two ends of said ladder side rail, wherein the surface of said handrails have a durable and high grip topology, preferably knurled.

Description

FIELD OF THE DISCLOSURE

The field of the disclosure is a handrail for a ladder.

BACKGROUND OF THE DISCLOSURE

Handrails serve to stabilize the balance of people standing or walking on a staircase, bathtub, shower, escalator, and ladder. Lachance [U.S. Pat. No. 4,425,984] discloses a removable handrail for a ladder. However, this and all identified ladder safety handrails in the marketplace do not have the combination of handrails substantially along the same plane with at least one ladder member to minimize the chances of ladder tip-over, along with a surface topology feature which maximizes handgrip, while having the possibility of being removable, and the possibility to extend or telescope for an extendable-style of ladder.

SUMMARY OF THE DISCLOSURE

The present disclosure attempts to remedy all the previously mentioned issues with a novel, new safety handrail. This disclosure contains two main embodiments. One embodiment is for ladders with a single pair of side rails (hereinafter termed “EMB-L1P”). An alternative embodiment is for an extendable ladder comprising of two or more pairs of side rails (hereinafter termed “EMB-L2+P”).

For EMB-L1P, each safety handrail is placed parallel and close to a ladder side rail on substantially the same plane where said ladder side rails and rungs connecting said ladder side rails lie. Each safety handrail is constrained to its closest ladder side rail by a plurality of removable clamps and clamp-to-handrail links. The ladder that EMB-L2+P is designed for comprises of two or more ladders, each section comprising of a pair of ladder side rails and rungs connecting the side rails of each ladder. The overall length of this extendable ladder is stretched when one ladder, hereinafter called the fly ladder, is linearly displaced relative to the next lower section of the ladder so that the bottom of the fly ladder is raised toward the top of the next lower ladder. Likewise, the extendable safety handrails are attached alongside and can telescope longer with the fly ladder as the overall length of the extendable ladder is increased and vice versa when the extendable ladder is shortened in overall length. For both embodiments, the safety handrails can be further extended for some distance above the top of the ladder. The surface of all embodiments of the safety handrails preferably has a knurled surface to maximize handgrip. Said embodiments also cater to ladder embodiments which open like an A-frame or when at least two ladders are in contact with a ground surface, said sections are splayed apart by a finite angle less than 180 degrees, and said two sections intersect at some point above the ground surface.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings are provided to facilitate understanding in the detailed description. It should be noted that the drawing figures may be in simplified form and might not be to precise scale. In reference to the disclosure herein, for purposes of convenience and clarity only, directional terms such as top, bottom, left, right, up, down, over, above, below, beneath, rear, front, distal, and proximal are used with respect to the accompanying drawings. Such directional terms should not be construed to limit the scope of the embodiment in any manner.

FIG. 1 is a three-quarter view of the single ladder member embodiment “EMB-L1P” as well as zoom views of the knurled safety handrail surface.

FIG. 2 is a three-quarter view of the extendable ladder embodiment “EMB-L2+P” as well as zoom views of the junction between the fixed and telescoping portion of the base ladder safety handrail and the fly ladder safety handrail.

DETAILED DESCRIPTION OF THE DISCLOSURE

SAFETY HANDRAIL FOR SINGLE MEMBER LADDER (FIG. 1): FIG. 1 shows a three-quarter view of the “EMB-L1P” embodiment (1) meant for ladders with a single pair of side rails (2a). This ladder (10) comprises of two slender, long, laterally distal elements, called “side rails” (2a). As illustrated, each of the side rails (2a) has attached to it, an assembly of at least two “clamps” (3a, 3b), at least two “clamp-to-handrail links” (4a, 4b), one “base ladder safety handrail” (5) with a “knurled surface” (6), one “extendable top safety handrail” (7) with the same knurled surface (6) topology as in the base ladder safety handrail (5), and one “extendable top safety handrail tip” (8). The illustration shows only an assembly on one side of the ladder, but in practice, an identical assembly is attached to the side rail (2a) on the opposite side as a symmetric installation.

One clamp (3a) is placed at the bottom and another clamp (3b) is attached to the top of the side rail (2a). Each clamp (3a, 3b) is attached to a clamp-to-handrail link (4a, 4b respectively), that in turn is attached to the base ladder safety handrail (5). The endpoints of the base ladder safety handrail (5) are roughly near the endpoints of the side rail (2a) such that a substantial length of the side rail (2a) runs alongside the base ladder safety handrail (5) and is therefore substantially along the same plane as the single member ladder (10). Arranging as such reduces the chance of tip-over of said ladder (10) by keeping the operator's body close to the plane of said ladder (10). In another embodiment, intermediate clamps and “clamp-to-handrail links” (not shown) can be attached in between the two endpoint clamps (3a, 3b) if required for additional structural rigidity of the base ladder safety handrail (5).

An extendable top safety handrail (7) of slightly smaller diameter than the base ladder safety handrail (5) can extend further like a telescoping radio antenna to provide additional length beyond the top of the side rail (2a). This extendable top safety handrail (7) is situated at the opposite end of the feet of said ladder (10) that touches the ground surface. A tip (8) attached to the open end of the extendable top safety handrail (7) has a somewhat larger diameter than the extendable top safety handrail (7) to facilitate the operator gripping and telescoping the extendable top safety handrail (7). Optionally, the difference between the inner diameter of the base ladder safety handrail (5) and outer diameter of the extendable top safety handrail (7), where the former is slightly larger, is small enough to allow an interference fit and provide some resistance during extension and retracting. Once fully extended, an embodiment incorporating a locking mechanism can prevent inadvertent retracting of the extendable top safety handrail (7).

SAFETY HANDRAIL FOR EXTENDABLE LADDER (FIG. 2): FIG. 2 shows a three-quarter view of the “EMB-L2+P” embodiment (9) as applied to an “extendable ladder” (10, 11). The extendable ladder (10, 11) comprises of a “base ladder” (10) and at least one “fly ladder” (11) which can slide relative to the base ladder (10). Both the base ladder (10) and fly ladder (11) each comprise of a side rail (2a and 2b, respectively) at each of the distal lateral extents. As illustrated, the safety handrail assembly for the extendable ladder (10, 11) has the following attached for each side rail: at least three “clamps” (3a, 3b, 3c), at least three “clamp-to-handrail links” (4a, 4b, 4c), one “base ladder safety handrail” (5) with a “knurled surface” (6), one “fly ladder safety handrail” (12), one “extendable top safety handrail” (7) with the same knurled surface (6) topology as in the base ladder safety handrail (5), and one “extendable top safety handrail tip (8).

On each side of the base ladder (10), at least two clamps (3a, 3b), at least two clamp-to-handrail links (4a, 4b), and a base ladder safety handrail (5) are implemented like the single member ladder embodiment (1) discussed in FIG. 1. Therefore, the base ladder safety handrail (5) is substantially along the same plane as the base ladder (10). Arranging as such reduces the chances of the extendable ladder (10, 11) tipping over by keeping the operator's body close to the plane of the base ladder (10). In another embodiment, additional intermediate clamps and clamp-to-handrail links (not shown) can be attached in between the two endpoint clamps (3a, 3b) if required for additional structural rigidity of the base ladder safety handrail (5).

Connected along the same directional axis to the base ladder safety handrail (5) for this embodiment is a fly ladder safety handrail (12). The transition portion (13) from said base ladder safety handrail to fly ladder safety handrail is such that the inner diameter of the base ladder safety handrail (5) is slightly larger than the outer diameter of the fly ladder safety handrail (12) where the diameter difference can optionally be small enough to allow a high friction interference fit and provide some resistance during extension and retracting. The top of the fly ladder safety handrail (12) is attached to clamp-to-handrail link (4c), which in turn is connected to a clamp (3c) at the side rail (2b) near the top of the fly ladder (11) as shown in FIG. 2. Hence the fly ladder safety handrail (12) extends and retracts as the fly ladder (11) extends and retracts, respectively. The extendable top safety handrail (7) and extendable top safety handrail tip (8) have the analogous telescoping and relative diameter relationship to the fly ladder safety handrail (12) as the extendable top safety handrail (7) has with the base ladder safety handrail (5) for the “EMB-L1P” embodiment (1). Likewise, an embodiment incorporating a locking mechanism can be used to prevent inadvertent retracting of the extendable top safety handrail (7) once fully extended. As apparent in FIG. 2, the chance of the extendable ladder (10, 11) tipping over is minimized because the fly ladder safety handrail (12) is on or substantially along the same plane as the base ladder (10) as well as being on or slightly below the plane of the fly ladder (11) which allows the operator's body to be close to the plane of the fly ladder (11).

FIG. 2 shows the assembly for the “EMB-L2+P” embodiment (9) for only one side of the extendable ladder (10, 11), but in practice, an identical assembly is attached to the side rails (2a, 2b) on the opposite side as a symmetric installation. Furthermore, while the exemplary extendable ladder (10, 11) has one fly ladder (11), this disclosure can readily teach an embodiment of extendable ladders with two or more fly ladders (11) by repetition of the arrangement shown for the fly ladder safety handrail (12) along with the associated clamp (3c) and clamp-to-handrail link (4c).

CONSTRUCTION AND JOINING: The preferred construction embodiment for the base ladder safety handrail (5), fly ladder safety handrail (12), and extendable top safety handrail (7) is solid circular or tubular cross-section aluminum. The preferred surface topology embodiment of the safety handrails (5, 7, and 12) is knurled (6) to improve grip over a smooth surface. The clamp-to-handrail link (4a, 4b, 4c) embodiment can have a solid circular, tubular, or thin shell cross-section and is preferably made from aluminum. Said clamp-to-handrail links (4a, 4b, 4c) are fixed with the base ladder safety handrail (5) or fly ladder safety handrail (12) by use of a fastener, adhesive, or weld. The base ladder clamp-to-handrail links (4a, 4b) are attached to the corresponding clamps (3a, 3b) by way of fastener, adhesive, or weld.

Many alterations and modifications may be made by those having ordinary skill in the art without departing from the spirit and scope of the embodiment. Therefore, it must be understood that the illustrated embodiment has been set forth only for the purposes of example and that it should not be taken as limiting the embodiment as defined by the following claims. For example, notwithstanding the fact that the elements of a claim are set forth below in a certain combination, it must be expressly understood that the embodiment includes other combinations of fewer, more, or different elements, which are disclosed herein even when not initially claimed in such combinations.

Claims

1. A set of detachable ladder safety handrails comprising: a pair of tubular cross-section handrails;wherein said handrails are made of metal;wherein one handrail is situated approximately one to a few inches away from the distal edge of one of the two ladder side rails;wherein a second handrail is situated approximately one to a few inches away from the distal edge of the second ladder side rail;wherein said pair of handrails are on or substantially on the same plane which ladder side rails and rungs connecting said ladder side rails lie;wherein said pair of handrails are parallel to each other and said ladder side rails;wherein a plurality of removable clamps is attached to each of said ladder side rails;wherein each of the said handrails is coupled to said plurality of removable clamps by a plurality of clamp-to-handrail links;wherein each clamp-to-handrail link is securely bonded, welded, or fastened to said clamp on one end and nearest handrail on said link's opposite end;wherein said clamp-to-handrail links are made of a solid circular, tubular, or thin shell cross-section;wherein at least two clamps are attached to each ladder side rail and at least one clamp is attached near each of the two ends of said ladder side rail;wherein the surface of said handrails have a durable and high grip surface, said high grip surface having a knurled surface topology.

2. The set of detachable ladder safety handrails of claim 1, wherein each of said handrails at the end furthest from the feet of said ladder is extendable, wherein extendable portion of each of said handrails has an outer diameter that is slightly smaller than the inner diameter of the clamped non-extendable portion of said base ladder safety handrail, said extendable portion is aligned along the same directional axis as that of said base ladder safety handrail sharing the same side of said ladder, such that said extendable portion can telescope in and out of said non-extendable portion, said extendable portion at the open end can have a relatively larger cross-section attachment.

3. The set of detachable ladder safety handrails according to claim 2, wherein said extendable portion of said base ladder safety handrails has a high friction or grip surface, said high grip surface having a knurled surface topology.

4. The set of detachable ladder safety handrails of claim 1, further comprising: a second pair of tubular cross-section handrails connected to the side rails of a fly ladder to serve as fly ladder safety handrails for an extendable ladder;wherein said fly ladder safety handrails are made of metal;wherein one of said fly ladder safety handrails is situated approximately one to a few inches away from the distal edge of one of the two fly ladder side rails;wherein a second fly ladder safety handrail is situated approximately one to a few inches away from the distal edge of the second fly ladder side rail;wherein said fly ladder safety handrails are on or substantially on the same plane which base ladder side rails and rungs connecting said ladder side rails lie;wherein said fly ladder safety handrails are parallel to each other;wherein a plurality of additional removable clamps including at least one clamp attached near the top of each distal end of each of said fly ladder side rails;wherein said additional clamp-to-handrail links are made of a solid circular, tubular, or thin shell cross-section;wherein the directional axis of each of said fly ladder safety handrails are aligned along the same directional axis as the base ladder safety handrail sharing the same side relative to said extendable ladder;wherein the outer diameter of said fly ladder safety handrails is slightly smaller than the inner diameter of said base ladder safety handrails so as to allow said fly ladder safety handrails to slide inside the base ladder safety handrails in telescoping fashion when said fly ladder is displaced relative to said base ladder;wherein the surface of said fly ladder safety handrails have a durable and high grip, said high grip surface having a knurled surface topology.

5. The set of detachable ladder safety handrails of claim 4, wherein each of said fly ladder safety handrails at the end furthest from the feet of said extendable ladder is further extendable, wherein extendable portion of each of said fly ladder safety handrails has an outer diameter that is slightly smaller than the inner diameter of said fly ladder safety handrail, said extendable portion is aligned along the same directional axis as that of said fly ladder safety handrail sharing the same side of said ladder, such that said extendable portion can telescope in and out of said fly ladder safety handrail, said extendable portion at the open end can have a relatively larger cross-section attachment.

6. The set of detachable ladder safety handrails of claim 5, wherein said extendable portion of said fly ladder safety handrails has a high friction or grip surface, said high grip surface having a knurled surface topology.

7. The set of detachable fly ladder safety handrails of claim 4, optionally comprising a repeated arrangement of extendable and detachable handrails, clamps, clamp-to-handrail links of identical construction and layout for each additional fly ladder, further comprising of hollow handrails of slightly and successively narrowing diameters for every additional extending portion so that of each of said handrails can telescope or retract within said handrails associated with the adjacent lower ladder.

8. The set of detachable ladder safety handrails of claim 7, wherein each of top-most fly ladder safety handrails at the end furthest from the feet of said ladder is extendable, wherein extendable portion of said top-most fly ladder safety handrail has an outer diameter that is slightly smaller than the inner diameter of the top-most fly ladder safety handrail, said extendable portion is aligned along the same directional axis as that of said top-most fly ladder safety handrail sharing the same side of said extendable ladder, such that said extendable portion can telescope in and out of top-most fly ladder handrail, said extendable portion at the open end can have a relatively larger cross-section attachment.

9. The set of detachable ladder safety handrails according to claim 8, wherein said extendable portion of said top-most fly ladder safety handrail has a high friction or grip surface, said high grip surface having a knurled surface topology.