US 11,707,103 B2
Safety helmet with telescopically adjustable head size
Jan Musow, Lübeck (DE); Mohamed Houssem Harbi, Lübeck (DE); Steffen Pracht, Lübeck (DE); and Jasser Rahmatyan, Lübeck (DE)
Assigned to Dräger Safety AG & Co. KGaA, Lübeck (DE)
Filed by Dräger Safety AG & Co. KGaA, Lübeck (DE)
Filed on Apr. 28, 2021, as Appl. No. 17/242,702.
Claims priority of application No. 10 2020 002 610.9 (DE), filed on Apr. 30, 2020; and application No. 102020002617.6 (DE), filed on Apr. 30, 2020.
Prior Publication US 2021/0337910 A1, Nov. 4, 2021
Int. Cl. A42B 3/14 (2006.01)
CPC A42B 3/145 (2013.01) [A42B 3/14 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A safety helmet comprising:
an arched helmet shell;
a bearing ring attached on an inside to the helmet shell and configured to fully or at least partially encompass a head of a user of the safety helmet and to determine a head size of the safety helmet;
an actuating element accessible from an outside of the helmet shell and rotatably attached to the helmet shell; and
a transmission unit configured to transmit a rotation of the actuating element to the bearing ring such that the head size provided by the bearing ring is changed, wherein the transmission unit comprises:
a helmet shell-side transmission piece non-rotatably connected to the actuating element so as to rotate in unison with the actuating element; and
a bearing ring-side transmission piece, wherein:
the helmet shell-side transmission piece and the bearing ring-side transmission piece together at least partially bridge a distance between the actuating element and the bearing ring and extend along a common longitudinal axis;
the helmet shell-side transmission piece is configured to move, linearly in parallel to the common longitudinal axis, relative to the actuating element in two opposite directions;
the bearing ring-side transmission piece is non-rotatably connected to the helmet shell-side transmission piece so as to be rotatable in unison therewith and is mechanically connected to the bearing ring;
the bearing ring-side transmission piece is configured to move, linearly in parallel to the common longitudinal axis, relative to the helmet shell-side transmission piece in two opposite directions; and
the distance between the actuating element and the bearing ring is changeable both by a linear movement of the helmet shell-side transmission piece relative to the actuating element and by a linear movement of the bearing ring-side transmission piece relative to the helmet shell-side transmission piece.