US 12,005,551 B2
Adjustable pivot bolt for a sealed manhole clamp
David E Sisk, Bonne Terre, MO (US); Peter Kemp, St. Louis, MO (US); and Jason Husky, Park Hills, MO (US)
Filed by David E Sisk, Bonne Terre, MO (US); Peter Kemp, St. Louis, MO (US); and Jason Husky, Park Hills, MO (US)
Filed on Mar. 2, 2020, as Appl. No. 16/873,236.
Claims priority of provisional application 62/919,379, filed on Mar. 7, 2019.
Prior Publication US 2020/0282521 A1, Sep. 10, 2020
Int. Cl. B25B 5/04 (2006.01); B25B 5/10 (2006.01); B25B 5/14 (2006.01); B61D 17/16 (2006.01); B65D 90/00 (2006.01)
CPC B25B 5/04 (2013.01) [B25B 5/10 (2013.01); B25B 5/145 (2013.01); B61D 5/08 (2013.01); B61D 17/16 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An adjustable pivot bolt for a sealed manhole clamp for use in a vertically upright orientation for securing a manhole cover to a weld ring upon an upper opening of a tank trailer, dry bulk trailer, or other conveying vehicle, the adjustable pivot bolt comprising:
a cylindrical upper portion having internal threads inside an internally threaded channel and a boss having an aperture;
a lower bolt portion positioned vertically below the cylindrical upper portion and having a length having a threaded portion with the threaded portion positioned inside the internally threaded channel and engaging with the internal threads in the internally threaded channel of the cylindrical upper portion and a bottom having a boss having an aperture; and
the threaded portion of the lower bolt portion is completely contained within the internally threaded channel of the cylindrical upper portion and the threaded portion of the lower bolt portion does not extend outside the internally threaded channel of the cylindrical upper portion.