Shutter device

Claim 2

A shutter device incorporating a shutter and a mechanism for raising and lowering the shutter, the improvement comprising feeler means sensitive to the external thermal- and light radiation, the feeler means being operatively coupled with the raising and lowering mechanism in order to trigger the raising and lowering mechanism, upon exceeding a predetermined radiation intensity, for the purpose of lowering the shutter, said mechanism including a blockable manual draw device for raising the shutter against its own weight, the feeler means comprising a transducer element containing an expansible material and arranged at the outside of the shutter, said transducer element incorporating an actuation element movable in direct response to the thermal expansion of the expansible material, said actuation element cooperating directly with said blockable manual draw device so that upon movement of said actuation element in response to the thermal expansion of the expansible material there can be directly released the blocking of the manual draw device due to the direct coaction of said actuation element therewith.

Claim 3

The device as defined in claim 1, wherein the transducer element comprises a bellows anchored at one end, the internal space of the bellows being hermetically sealed against the outside and the other end of the bellows being connected with the actuation element.

Claim 4

The device as defined in claim 1, wherein the shutter is a Venetian blind having slats, said feeler means being coupled with means in order to change the inclination of the slats of the shutter after actuation of the mechanism for raising and lowering the shutter.

Claim 5

The device in claim 1, wherein the shutter is a Venetian blind having slats, the feeler means being coupled with means in order to change the inclination of the slats of the shutter after actuation of the mechanism for raising and lowering the shutter, the actuation element being displaceably mounted between a rest position and a terminal positon and during the course of its displacement stroke from the rest position said actuation element successively releases the blocking of the manual draw device and thereafter actuates the means for changing the inclination of the shutter slats.

Claim 6

The device as defined in claim 1, further including a switch element, the actuation element upon assuming a rest position maintaining the switch element in its closed position and which switch element switches-on a shutter drive motor, which can be switched-off upon the shutter being raised, and said drive motor being coupled with the manual draw device via a freewheeling coupling.

Claim 7

A shutter device incorporating a shutter and a mechanism for raising and lowering the shutter, the improvement comprising feeler means sensitive to the external thermal- and light radiation, the feeler means being operatively coupled with the raising and lowering mechanism in order to trigger the raising and lowering mechanism, upon exceeding a predetermined radiation intensity, for the purpose of lowering the shutter, said mechanism includes a blockable manual draw device for raising the shutter against its own weight, the feeler means comprising a transducer element containing an expansible material and arranged at the outside of the shutter, said transducer element incorporating an actuation element movable in response to the thermal expansion of the expansible material and by means of which there can be released the blocking of the manual draw device, the transducer element comprising a piston-cylinder unit having a cylinder compartment which is hermetically sealed against the outside and filled with a fluid medium constituting said expansible material, the thermal coefficient of expansion of which is different from that of the material of the piston-cylinder unit.

Claim 8

A shutter device incorporating a shutter and a mechanism for raising and lowering the shutter, the improvement comprising feeler means sensitive to the external thermal- and light radiation, the feeler means being operatively coupled with the raising and lowering mechanism in order to trigger the raising and lowering mechanism, upon exceeding a predetermined radiation intensity, for the purpose of lowering the shutter, said mechanism includes a blockable manual draw device for raising the shutter against its own weight, the feeler means comprising a transducer element containing an expansible material and arranged at the outside of the shutter, said transducer element incorporating an actuation element movable in response to the thermal expansion of the expansible material and by means of which there can be released the blocking of the manual draw device, the transducer element comprising a piston-cylinder unit having a cylinder compartment which is hermetically sealed against the outside and filled with a fluid medium constituting said expansible material, the thermal coefficient of expansion of which is different from that of the material of the piston-cylinder unit.

Claim 9

The device as defined in claim 6, wherein the piston-cylinder unit is filled with a gas and constructed as a gas cartridge.

Claim 10

The device as defined in claim 6, wherein the piston-cylinder unit is filled with a liquid.

Claim 11

The device as defined in claim 8, wherein the liquid is a liquid hydrocarbon.

Claim 12

The device as defined in claim 8, wherein the liquid is carbon tetrachloride.

Claim 13

The device as defined in claim 6, wherein the piston-cylinder unit contains a substance which by radiation can be transformed into the vapor phase.

Claim 14

The device as defined in claim 11, wherein the substance is a liquid.

Claim 15

The device as defined in claim 11, wherein the substance is a wax-like propellant.