A helmet for protecting a wearer's head. The helmet comprises an outer shell comprising a first shell member and a second shell member movable relative to one another in a longitudinal direction of the helmet to adjust a fit of the helmet on the wearer's head. The helmet comprises an adjustment mechanism configured to control movement of the first shell member and the second shell member relative to one another. The adjustment mechanism comprises an actuator movable between a first position in which the first shell member and the second shell member are allowed to move relative to one another and a second position in which the first shell member and the second shell member are precluded from moving relative to one another. The actuator is configured to lock the first shell member and the second shell member relative to one another without extending through a given one of the first shell member and the second shell member.

A helmet can include a protective shell and a layer of energy management material coupled to an inner surface of the protective shell to form a cavity for receiving a head of a user. An earpad can be coupled to the inner surface of the protective shell that comprises an inner surface that further defines a space for an ear of a user. The earpad can further include a leading edge at a front of the helmet, the leading edge extending between the outer surface of the protective shell and the inner surface of the earpad. An air intake opening can be formed at the leading edge of the earpad. An air exhaust opening can be formed at a trailing edge of the earpad. An airflow channel can extend through the earpad between the air intake opening and the air exhaust opening.

A bicycle helmet that fits over a surface of a head of a user generally includes at least one segment of flexible cell structures that form a radial honeycomb matrix movable between a folded condition where each side of the at least one segment is disposed generally parallel and an expanded condition where the radial honeycomb matrix of the at least one segment is configured to be expanded at least partially over the head of the user and arranged radially relative to the surface of the head of the user.

The adjustable helmet assembly disclosed within in comprises a front shell, a back shell and a locking mechanism. The locking mechanism allows sliding movement of the front shell relative to the back shell for adjustment to a desired length for a specific wearer. The locking mechanism is movable from an unlocked position allowing the front shell to move relative to the back shell, and a locked position prohibiting the front shell to move relative to the back shell. The locking mechanism may be a clamp or lever function, and/or a cam function. Accordingly, the adjustable helmet may further comprise crumple zones to further reduce and/or dissipate impact forces.

Helmet retention systems including a dial adjustment mechanism for adjusting the effective length of a head band are described. The dial adjustment mechanisms include a separator to separate portions of the head band during adjustment.

A lift, a head support, and methods for use thereof for use with a surgical frame are provided. The lift and the head support can be used with the surgical frame that is capable of reconfiguration before, during, or after surgery. The surgical frame can include a main beam that can be rotated, raised/lowered, and tilted upwardly/downwardly to afford positioning and repositioning of a patient supported thereon, and the lift and the head support can be used in lifting the patient from a table/gurney and positioning the patient with respect to the main beam.

A lift, a head support, and methods for use thereof for use with a surgical frame are provided. The lift and the head support can be used with the surgical frame that is capable of reconfiguration before, during, or after surgery. The surgical frame can include a main beam that can be rotated, raised/lowered, and tilted upwardly/downwardly to afford positioning and repositioning of a patient supported thereon, and the lift and the head support can be used in lifting the patient from a table/gurney and positioning the patient with respect to the main beam.

A protective sports helmet that includes a chin strap system that allows for rapid, one-handed adjustment of a chin strap assembly by the player while he/she is wearing the helmet is provided. The chin strap assembly includes a protective chin cup and a pair of straps extending from opposed sides of the chin cup and having a plurality of securing elements. The assembly also includes a pair of adjustable connectors affixed to the helmet and that include a central opening that receives an extent of the strap and a lever that engages a portion of the securing elements. The adjustable connector allows movement of the strap in a first direction, and prevents movement of the strap in a second direction when the lever is engaged with at least one of the securing elements. The adjustable connector allows movement of the strap in both the first and second directions when the lever is not engaged with the securing elements.

A collapsible helmet for use in various athletic activities, and which includes a structure that facilitates collapsing the helmet into a compact position for storage and/or transport of same. The helmet includes an outer shell having an inner cavity, and one or more flexible sheets, each of which includes a center portion and a plurality of segments. The sheets are positioned in the inner cavity such that they are movable and slideable relative to the outer shell and each other so as to allow the helmet to be collapsed from an open position to a collapsed position.

A bicycle helmet that fits over a surface of a head of a user generally includes at least one segment of flexible cell structures that form a radial honeycomb matrix movable between a folded condition where each side of the at least one segment is disposed generally parallel and an expanded condition where the radial honeycomb matrix of the at least one segment is configured to be expanded at least partially over the head of the user and arranged radially relative to the surface of the head of the user.