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Title: Tubular pole slip joint construction
Claims: I claim: 1. In a slip joint construction for a tubular pole useful as a utility pole and having a first tapered tubular pole section constructed of a pair of half shells joined at longitudinal seam welds, a second tapered tubular pole section constructed of a pair of half shells joined at longitudinal seam welds, said first pole section having a male portion at one end thereof, said second pole section having a female portion at one end thereof, said male poriton being adapted to fit telescopically within said female portion with a friction tight slip joint connection, the improvement comprising a back-up strip welded to a longitudinal seam weld of said female section on the inside thereof, a longitudinal slot formed in the end of said male portion aligned with a longitudinal seam weld thereof, and a plate welded on the inside of said male portion and extending across and along the longitudinal extent of said slot to cooperate therewith to form a recess for receiving said back-up strip when the slip joint is made. 2. A slip joint construction according to claim 1 wherein there is provided a back-up strip welded to each longitudinal seam weld of said female section on the inside thereof, a longitudinal slot formed in the end of said male portion aligned with each longitudinal seam weld thereof, and a plate welded on the inside of said male portion and extending across and along the longitudinal extent of each of said slots. 3. A slip joint construction according to claim 2 wherein said plates extend a longitudinal distance beyond the inner end of the longitudinal slot, the longitudinal seam welds of said first pole being welded to said plate portion extending beyond said slot. 4. A slip joint construction according to claim 3 wherein said plates are secured to said first pole section by a fillet weld extending along the edges of each of said slots, said fillet weld being joined with said longitudinal seam welds of said first pole section. 5. A slip joint construction according to claim 4 wherein each of said plates is secured to said first pole section by a second fillet weld extending around the periphery of each plate. 6. A slip joint construction according to claim 2 wherein the thickness of said plates on said first pole section is at least equal to the thickness of said pole section plus approximately one-eighth of an inch. 7. A slip joint construction according to claim 5 wherein the thickness of said plates on said first pole section is at least equal to the thickness of said pole section plus approximately one-eighth of an inch. 8. A slip joint construction according to claim 2 wherein the longitudinal extent of said slots is equal to approximately ten per cent greater than the design slip joint length. 9. A slip joint construction according to claim 5 wherein the longitudinal extent of said slots is equal to approximately ten per cent greater than the design slip joint length. 10. A slip joint construction according to claim 6 wherein the longitudinal extent of said slots is equal to approximately ten per cent greater than the design slip joint length. Other info: Inventors: Meisberger, Raymond F. (West Chester, PA, US) Application Number: 550373 Filing Date: 1975-02-18 Publication_date: 1976-02-03 Assignee: Bruce-Lake Company (Coatesville, PA) Primary Class(es): 403/334 52/726.4 Other Classes: US Patent Ref:
Other Refs: Primary Examiner: Kundrat, Andrew V. Assistant Examiner: Attorney: Smith, Harding, Earley & Follmer |
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