Fast-acting tubular shutter

Claim 2

A photographic shutter, comprising: a generally cylindrical opaque shuttering means mounted for rotation about its longitudinal axis, said means having diametrically opposed openings therein for passing a substantially unattenuated beam of light directed transverse to said longitudinal axis; torsion spring means connnected to said shuttering means for driving said shuttering means, said torsion spring means comprising a resilient solid cylindrical rod disposed coaxially with said shuttering means and adapted to be torsionally loaded; variable loading means for adjusting the initial load on said springs means; and triggering means including catch means for retentively engaging said shuttering means in a light blocking position and tripping means for disengaging said catch means upon actuation thereof.

Claim 3

The shutter defined by claim 1 including indicating means cooperating with said variable loading means for providing an indication of the magnitude of said initial load on said spring means established by said variable loading means.

Claim 4

A photographic shutter, comprising: a generally cylindrical opaque shuttering means mounted for rotation about its longitudinal axis, said means having diametrically opposed openings therein for passing substantially unattenuated a beam of light directed transverse to said longitudinal axis; torsion spring means connected to said shuttering means for driving said shuttering means; variable loading means for adjusting the initial load on said spring means; triggering means including catch means for retentively engaging said shuttering means in a light blocking position and tripping means for disengaging said catch means upon actuation thereof; and adjustable trigger mounting means mounted for rotation about said longitudinal axis of said shuttering means including securing means for locking said catch means in a selected angular position determinative of the magnitude of the delay between tripping of said catch means and opening of said shuttering means.

Claim 5

A photographic shutter, comprising: a generally cylindrical opaque shuttering means mounted for rotation about its longitudinal axis, said means having diametrically opposed openings therein for passing substantially unattenuated a beam of light directed transverse to said longitudinal axis; torsion spring means connected to said shuttering means for driving said shuttering means; variable loading means for adjusting the initial load on said spring means; triggering means including catch means for retentively engaging said shuttering means in a light blocking position and tripping means for disengaging said catch means upon actuation thereof; and adjustable trigger mounting means mounted for rotation about said longitudinal axis of said shuttering means including securing means for locking said catch means in a selected angular position determinative of the magnitude of the delay between tripping of said catch means and opening of said shuttering means.

Claim 6

The shutter defined by claim 3 including delay indicating means cooperating with said trigger mounting means for providing an indication of the magnitude of said delay.

Claim 7

The shutter defined by claim 3 including indicating means cooperating with said variable loading means for providing an indication of the magnitude of said initial load on said spring means established by said variable loading means.

Claim 8

The shutter defined by claim 5 wherein said torsion spring means comprises a resilient solid cylindrical rod disposed coaxially with said shuttering means and adapted to be torsionally loaded.

Claim 9

The shutter defined by claim 6 including delay indicating means cooperating with said trigger mounting means for providing an indication of the magnitude of said delay.

Claim 10

The shutter defined by claim 7 wherein said cylindrical shuttering means has a radial arm engageable by said catch means and wherein said shutter includes energy dissipating means positioned to receive said trigger arm after release thereof, said energy dissipating means comprising a pair of spring members joined at one end with free ends biased together to provide a normally closed friction-generating channel for receiving said trigger arm.

Claim 11

A photographic shutter comprising: a generally cylindrical opaque shuttering means mounted for rotation about its longitudinal axis, said means having diametrically opposed openings therein for passing substantially unattenuated a beam of light directed transverse to said longitudinal axis; torsion spring means connected to said shuttering means for driving said shuttering means, said torsion spring means comprising a resilient solid cylindrical rod disposed coaxially with said shuttering means and adapted to be torsionally loaded; first triggering means including first catch means for retentIvely engaging said shuttering means in a light blocking position and first tripping means for disengaging said first catch means upon actuation thereof; and second triggering means including second catch means for engaging and stopping said shuttering means in a light unblocking position wherein said diametrically opposed openings are aligned with the light paths, said second triggering means including second tripping means for disengaging said second catch means upon actuation thereof.

Claim 12

A photographic shutter comprising: a generally cylindrical opaque shuttering means mounted for rotation about its longitudinal axis, said means having diametrically opposed openings therein for passing substantially unattenuated a beam of light directed transverse to said longitudinal axis; torsion spring means connected to said shuttering means for driving said shuttering means, said torsion spring means comprising a resilient solid cylindrical rod disposed coaxially with said shuttering means and adapted to be torsionally loaded; first triggering means including first catch means for retentIvely engaging said shuttering means in a light blocking position and first tripping means for disengaging said first catch means upon actuation thereof; and second triggering means including second catch means for engaging and stopping said shuttering means in a light unblocking position wherein said diametrically opposed openings are aligned with the light paths, said second triggering means including second tripping means for disengaging said second catch means upon actuation thereof.