US 12,187,562 B2
Chuck with improved torque transmission and centralization
Markku Ronnila, Lahti (FI); Ismo Kervinen, Kotka (FI); and Andrei Klimenko, Lohja (FI)
Assigned to Sonoco Development, Inc., Hartsville, SC (US)
Filed by Sonoco Development, Inc., Hartsville, SC (US)
Filed on Nov. 6, 2023, as Appl. No. 18/502,900.
Application 18/502,900 is a continuation of application No. 17/110,970, filed on Dec. 3, 2020, granted, now 11,807,477.
Prior Publication US 2024/0067479 A1, Feb. 29, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. B65H 18/10 (2006.01); B65H 16/02 (2006.01); B65H 16/10 (2006.01); B65H 18/02 (2006.01)
CPC B65H 18/10 (2013.01) [B65H 16/02 (2013.01); B65H 16/103 (2013.01); B65H 18/02 (2013.01); B65H 2301/41461 (2013.01); B65H 2403/72 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A chuck for receiving a hollow cylindrical core used for winding and unwinding a sheet of material, the core having a core inner diameter and a core outer diameter, the chuck defining an axis and comprising:
a flange adapted to attach the chuck to a rotating support;
a body extending axially from the flange, the body comprising one or more stepped portions near the flange and a distal portion farther away from the flange, the distal portion having a distal portion diameter that is less than the core inner diameter, the distal portion and the core defining a gap therebetween when the core is mounted onto the chuck, the body defining a plurality of recesses; and
a plurality of expansion elements circumferentially disposed around the body and adapted to grip an inner surface of the core, each expansion element nested within one of the recesses having a core contacting surface; wherein
the one or more stepped portions have a stepped portion diameter that increases from a first stepped portion diameter that is less than the core inner diameter to a second stepped portion diameter that is greater than or equal to the core inner diameter as the stepped portion extends from the distal portion toward the flange;
the one or more stepped portions are configured to contact the core inner surface and center the chuck inside the core when the core is mounted onto the chuck; and
the expansion elements are moveable between an unexpanded position in which each of the expansion elements is disposed within one of the plurality of recesses and an expanded position in which each of the expansion elements is located radially outward of its unexpanded position and in which the core contacting surface contacts the inner surface of the core.