초록 ▼

A tray holding device for mounting to a D-rung ladder is disclosed. The mounting shaft inserts into an outwardly facing D-shaped aperture of the ladder and slidably engages the inner wall of the rung. In one embodiment, the shaft is D-shaped and fits telescopically within the D-rung opening. Optiona

A tray holding device for mounting to a D-rung ladder is disclosed. The mounting shaft inserts into an outwardly facing D-shaped aperture of the ladder and slidably engages the inner wall of the rung. In one embodiment, the shaft is D-shaped and fits telescopically within the D-rung opening. Optionally, the shaft is molded in a slightly bowed condition and, when in use, is under flexural tension. Alternatively, molded into the thermoplastic tray-holding portion is an extruded metal shaft. The shaft configurations shown engage the interior wall of the rung cavity and preclude rotation. Some shaft configurations engage both the flat side and the curved side of the D-rung cavity and enable the tray holding device to be reversibly insertable into a rung cavity.

대표청구항 ▼

1. A tray holding device for mounting to a D-rung ladder having hollow rungs extending through a pair of spaced apart rails, said hollow rungs having outwardly facing D-shaped openings at the ends of the rung cavity, said tray holding device comprising, in combination:a shaft and tray device, adapte

1. A tray holding device for mounting to a D-rung ladder having hollow rungs extending through a pair of spaced apart rails, said hollow rungs having outwardly facing D-shaped openings at the ends of the rung cavity, said tray holding device comprising, in combination:a shaft and tray device, adapted for mounting on said ladder, being a unitary structure from a material selected from a group consisting of a thermoplastic and a reinforced thermoplastic, said shaft and tray device, in turn, comprising:a shaft portion for, upon mounting to said ladder, slidably engaging the inner wall of said rungs cavity;a tray portion contiguous with and attached to said shaft, and, when installed in said ladder in an operative position, said tray portion extending outwardly and substantially horizontally from one side thereof; anda tray support portion depending from said tray portion and undergirding said tray portion to increase the load capacity thereof;a raised edge portion about and arising from the perimeter of said tray portion and adjacent juncture with said shaft;a hand grip portion in said raised edge portion, upon mounting said holding device into said rung cavity, adapted to rest against said rail of said ladder;said shaft portion is in cross-section configured to be inscribed within the D-shape of said D-shaped openings of said hollow rungs, said shaft slidably engaging both the flat side of said D-shape and the curved side of said D-shape; anda raised edge portion about and arising from the perimeter of said tray portion and adjacent said shaft;a hand grip opening in said raised edge portion, upon mounting said holding device into said rung cavity, said hand grip opening adapted to rest against said rail of said ladder;said shaft portion has a cross-section configured to be inscribed within the D-shape of said D-shaped openings of said hollow rungs, said shaft slidably engaging both the flat side of said D-shape and the curved side of said D-shape. 2. A tray holding device as described in claim 1 wherein said shaft portion in the relaxed state is slightly bowed and, upon insertion into said rung cavity straightens and exerts flexural tension against the inner wall thereof. 3. A tray holding device as described in claim 2 wherein said shaft portion is D-shaped in cross-section and configured to telescopically fit within said D-shaped openings of said hollow rungs. 4. A tray holding device as described in claim 3 wherein said tray support portion is a plurality of ribs undergirding said tray portion. 5. A tray holding device as described in claim 3 wherein said portion support structure is a honeycomb structure underlying said portion. 6. A tray holding device as described in claim 3 wherein said device is adapted for use with said ladder in an operative position, said tray holding device further comprising:a shaft-to-tray connector portion adapted to dispose the upper surface of said tray portion horizontal when said tray holding device is inserted into one of said D-shaped openings of a ladder in said operative position. 7. A tray holding device as described in claim 6 wherein said opening portion is adapted to facilitate one-handed mounting and demounting enabling the operator to hold onto the ladder with the free hand. 8. A tray holding device for mounting to a D-rung ladder having hollow rungs extending through a pair of spaced apart rails, said hollow rungs having outwardly facing D-shaped openings at the ends of the rung cavity, said tray holding device comprising:a shaft and tray device, adapted for mounting on said ladder, being a unitary structure from a material selected from a group consisting of a thermoplastic and a reinforced thermoplastic, said shaft and tray device, in turn, comprising:a shaft portion for, upon mounting to said ladder, slidably engaging the inner wall of said rungs cavity;a tray portion contiguous with and attached to said shaft, and, when installed in said ladder in an operative position, said tr ay portion extending outwardly and substantially horizontally from one side thereof; anda tray support portion depending from said tray portion and undergirding said tray portion to increase the load capacity thereofa raised edge portion arising from the side of said tray portion and adjacent with said shaft;a hand grip opening in said raised edge portion, said hand grip opening, upon mounting said holding device into said rung cavity, adapted to rest against said rail of said ladder; and,said shaft portion is D-shaped in cross-section and configured to telescopically fit within said D-shaped openings of said hollow rungs. 9. A tray holding device as described in claim 8 wherein said shaft portion in the relaxed state is slightly bowed and, upon insertion into said rung cavity straightens and exerts flexural tension against the inner wall thereof. 10. A tray holding device as described in claim 8 wherein said tray support portion is a plurality of ribs undergirding said portion. 11. A tray holding device as described in claim 8 wherein said device is adapted for use with said ladder in an operative position, and wherein tray portion has an upper surface and a lower surface said tray holding device further comprising:a shaft-to-tray connector portion adapted to dispose said upper surface of said tray portion horizontal when said tray holding device is inserted into one of said D-shaped openings of a ladder in said operative position. 12. A tray holding device as described in claim 11 wherein said hand opening portion is adapted to facilitate one-handed mounting and demounting enabling the operator to hold onto the ladder with the free hand.