Patent ID: 7905629

Claim:
A focusable lamp comprising: a lamp assembly, said lamp assembly comprising a handle, a cylindrical mounting neck, and a light source located at the distal end of said cylindrical mounting neck, said cylindrical mounting neck comprising one or more resilient protruding tabs located about the circumference of said neck, and helical focusing threads extending circumferentially about said neck; and a reflector assembly comprising a parabolic reflector held within said reflector assembly, a resilient cylindrical collar protruding rearwardly from said reflector assembly at the apex of said parabolic reflector, said collar having an internal surface comprising corresponding helical mating threads that extend circumferentially around the inside of said collar and mate with said focusing threads, said internal surface further comprising a plurality of alternating ridges and valleys extending circumferentially around the interior of said collar adjacent to the mating threads and resiliently contacting said one or more protruding tabs; wherein when sufficient rotational force is applied to said reflector assembly, said resilient one or more of said ridges slide over one or more of said resilient protrusions and when said rotational force is removed, said resilient one or more protrusions lodge between two ridges within one or more of said valleys to resist further rotation and cause said distance between said light source and said parabolic reflector to remain constant.