Founding system
View Patent ↗A founding chair for a founding ladder system is of a lightweight fabricated design and includes a pivotally secured top leveling plate. A ladder system for the founding chair includes a slide in engagement rack for securing of the founding chair and allowing incremental adjustment.
1. A founding chair for a founding ladder system, said founding chair including two opposed side members with each side member including a front edge, a top edge, and a diagonal edge; said diagonal edge including a series of open notches for adjustably securing said founding chair to a founding ladder; said founding chair including a fixed top member extending between said opposed side members and generally parallel to and positioned below said top edge;
a bracing arrangement extending between said opposed side members and below said fixed top member; and a variable scaffold support plate positioned above and in engagement with said fixed top member; said variable scaffold support plate including a planar top surface; said variable scaffold support plate pivoting on said fixed top member about a pivot axis extending across said fixed top member whereby an angular position of said planar top surface relative to said front edge is adjustable, wherein said fixed top member and said variable support plate cooperate to define a central support surface therebetween that includes said pivot axis, said variable scaffold support plate including a releasable locking arrangement for securing said variable scaffold support plate at different angular positions on said fixed top member; wherein
said fixed top surface includes a raised central portion extending between said opposed side members and said variable support plate pivots on said raised central portion.
2. A founding chair as claimed in claim 1 wherein said variable support plate includes two upwardly extending flanges extending between said opposed side members and positioned on either side of and extending above said planar top surface.
3. A founding chair as claimed in claim 2 wherein said upwardly extending flanges form part of said locking arrangement.
4. A founding chair as claimed in claim 3 wherein said locking arrangement includes locking bolts received in ends of said flanges and received in slots of said opposed side members; said bolts when tightened locking said flanges in a fixed position relative to said opposed side members.
5. A founding chair as claimed in claim 3 wherein said founding chair is made of an aluminum alloy.
6. A founding chair as claimed in claim 5 wherein said bracing arrangement includes at least two plate members extending between said opposed side members and supporting said fixed top member.
7. A founding chair as claimed in claim 6 wherein said at least two plate members include a ported plate positioned parallel to and adjacent the front edges of said opposed side members.
8. A founding chair as claimed in claim 7 wherein each side member between said at least two plate members include elongate ports sized to reduce the weight of said side members by at least 25%.
9. A founding chair as claimed in claim 8 wherein said series of open notches of each side member include at least 4 notches spaced along said diagonal edge.
10. A founding chair as claimed in claim 1 wherein said founding chair is fabricated and of an aluminum alloy material.
11. A founding chair as claimed in claim 1 wherein said variable scaffold support plate is an extruded member and includes two upwardly extending flanges positioned on opposite sides of the support plate and extending between said opposed side members.
12. A founding chair as claimed in claim 11 wherein each upwardly extending flange includes at opposite ends thereof a bolt receiving recess aligned with a bolt receiving slots of said side members, and forms part of said releasable locking arrangement.
13. A founding ladder system comprising
an elongate base beam spanning between converging lower boiler walls;
a pair of ladder supports secured to opposite ends of said elongate base beam and extending upwardly and outwardly and supported by the lower boiler walls;
each ladder support releasably supporting at least one founding chair according to claim 1 , said chair having an adjustable and lockable top surface allowing leveling and locking of said top surface with changes in angle of said ladder support.
14. A founding ladder system as claimed in claim 13 wherein each founding chair is fabricated from plate and extruded components of an aluminum alloy material.
15. A founding ladder as claimed in claim 14 wherein each founding chair is of a weight less than 35 pounds.
16. A founding ladder system as claimed in claim 13 wherein each ladder support includes two opposed side rails with a series of rungs extending between said side rails;
each side rail including a pair of spaced elongate supports and an upwardly opening central slot extending in a length thereof, and a series of founding chair support positions defined within each upwardly opening central slot.
17. A founding ladder system as claimed in claim 16 wherein each founding chair comprises opposed side members with each side member including a front edge, a top edge, and an angled diagonal edge; said diagonal edge including a series of open notches for adjustably securing said founding chair to one of said ladder supports; each founding chair including a fixed top member extending between said opposed side members and generally parallel to and positioned below said top edge; a bracing arrangement extending between said opposed side members and below said fixed top member; and
a variable scaffold support plate positioned above and in engagement with said fixed top member; said variable scaffold support plate including a planar top surface; said variable scaffold support plate pivoting on said fixed top member about an axis extending across said fixed top member whereby an angular position of said planar top surface relative to said front edge is adjustable; said variable scaffold support plate including a releasable locking arrangement for securing said variable scaffold support plate at different angular positions on said fixed top member.
18. A founding ladder system as claimed in claim 17 wherein said fixed top surface of each founding chair includes a raised central portion extending between said opposed side members and said variable support plate pivots on said raised central portion.