An inverted visor fixed to lower back rim of a motorcycle helmet to extend upwardly and backwardly therefrom and around a lower back portion thereof and adjustable for varying speeds of travel by a forward and backward tilt of wearer's head to maximum neck muscles relaxation for each speed.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
The invention relates generally to safety helmets for motorcycle riders, 
and more particularly to an aerodynamically stabilized motorcyclist 
helment adjustable by wearer to varying motorcycle speeds. 
2. Description of the Prior Art 
A search of the prior art disclosed only an ornamental design for a 
fireman's helmet, see Neff U.S. Pat. No. Des. 263,431 having a short 
forwarding descending front visor and a longer rearwarding descending back 
visor. 
SUMMARY OF THE INVENTION 
It is an object of the invention to provide an aerodynamically stabilized 
safety helmet for motor cyclists in which a flat plate wind pressure, 
resulting from and in direct proportional to the speed of the cycle and 
against the front part of the helmet is substantially counteracted by an 
induced wind pressure against the back part. 
Another object to the invention is to provide an easy means for varying the 
counteracting wind pressure against the back of an aerodynamically 
stabilized helmet in accordance with the speed of the motorcycle and 
resulting wind pressure against the front part of the helmet. 
Yet another object of the invention is to provide means for riding on a 
motorcycle at varying speeds and extended periods comfortably with relaxed 
neck muscles.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
Referring to FIGS. 1 and 2, the invention comprises a safety helmet 12 with 
a depending face shield 14 fixed to the lower front rim 16 of said helmet, 
and an inverted backvisor 18 fixed to the lower back rim 20 to extend 
upwardly and rearwardly therefrom. 
In use the helmet is held on the head of a wearer cyclist by a chin strap 
22 fixed to the sides of helmet 12 intermediate said front and back rims. 
Wind pressure against the face shield 14 and front of the helmet tends to 
force the helmet and head of the wearer cyclist back and downwardly in 
counterclockwise movement. Wind pressure against the inverted upwardly and 
backwardly extending visor tends to push the head of the wearer down and 
forwardly in clockwise movement. The two movements counteract each other, 
dependent upon speed of cycle and tilt of head, to releave neck muscles of 
all front and rear stresses. 
As speeds are increased, wind pressure is increased on the front of the 
helmet which is met by tilting the head and helmet forwardly thereby 
increasing wind pressures thereon the inverted visor and lessening it on 
the back of helmet. Tilting and head and helmet up reverses the wind 
pressures. The amounts of tilt in each case is determined by the 
motorcyclist for minimum neck muscle stress for the motorcycle speed by 
the counter-acting front and back wind pressures aerodynamically 
stabilizing the helmet.