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Lewicki Lester R: Air cooled helmet. Bell Helmets, White and Haefliger, December 16, 1975: US3925821 (83 worldwide citation)

A helmet adapted especially for bicyclist wear comprising an outer shell or lamination adhered to an insulative or shock absorptive liner spaced, as worn, from the head of the wearer, the helmet having distributed air intake openings extending through the liner and from which entering air streams ar ...


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Lester R Lewicki, James D Santacroce: Helmet retention system. Bell Helmets, White and Haefliger, August 30, 1977: US04044400 (80 worldwide citation)

A helmet retention system including a forwardly facing helmet comprises,


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Lester V Broersma: Ventilated helmet. Bell Helmets, William W Haefliger, December 3, 1985: US04555816 (57 worldwide citation)

A cyclist's helmet incorporates a dome shaped top wall structure, opposite side wall structures, a front opening for forward viewing, a lower front wall structure which extends forwardly and a rear wall structure. It also includes:


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Lester V Broersma: Helmet with adjustable ventilation. Bell Helmets, William W Haefliger, September 23, 1986: US04612675 (57 worldwide citation)

A motorcyclist's or bicyclist's helmet has dome shaped top wall structure, side wall structures, a front opening for forward viewing, a lower front wall structure which juts forwardly, and rear wall structure; and it also includes:


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Lester V Broersma: Helmet retention system with adjustable buckle. Bell Helmets, William W Haefliger, February 20, 1990: US04901373 (57 worldwide citation)

A helmet retention system includes a junction plate which, when tilted relative to the wearer's cheek, loosens its grip, on a chin strap. The plate is attached to a strap or straps which are in turn attached to the helmet. The plate has a triangular cross section cross piece with narrow lands having ...


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Lester V Broersma: Aerodynamic bicyclists helmet construction. Bell Helmets, William W Haefliger, March 31, 1987: US04653123 (52 worldwide citation)

A bicyclist's helmet has an outer shell; an inner liner; forward air inlet structure and rearward air discharge structure, as well as air channeling in between the inlet and discharge to provide ram effect cooling; resiliently collapsible bellows padding on the liner to engage the wearer's head; ret ...


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Lester V Broersma: Helmet retention system with adjustable buckle. Bell Helmets, William W Haefliger, June 23, 1992: US05123121 (50 worldwide citation)

A helmet retention system includes a junction plate which, when tilted relative to the wearer's cheek, loosens its grip, on a chin strap. The plate has a triangular cross section cross piece with narrow lands having edges normally gripping the chin strap. Also, the helmet has a lower outer side whic ...


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Lester V Broersma: Multiple density helmet body compositions to strengthen helmet. Bell Helmets, William W Haefliger, May 10, 1994: US05309576 (43 worldwide citation)

A protective helmet having a dome-shaped body and air vent structure in the body comprising a body consisting of molded, synthetic resin sections, a first the section having relatively higher density and a second the section having relatively lower density; the first section extending in strengtheni ...


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James G Sundahl: Suction ventilated helmet. Bell Helmets, William W Haefliger, November 18, 1986: US04622700 (40 worldwide citation)

A forwardly longitudinally extending cyclist's protective helmet includes a dome shaped outer shell having a forward portion, a rearward portion, and a medial portion over which air flows substantially smoothly as the cyclist moves forwardly. That medial portion includes an upper crown and laterally ...