초록 ▼

The invention relates to a pyrotechnic fuse element having a closed housing consisting of an electrically conductive material, in which an explosive is provided, the housing containing two terminal zones for electric contacting, which are electrically connected by means of the electrically conductiv

The invention relates to a pyrotechnic fuse element having a closed housing consisting of an electrically conductive material, in which an explosive is provided, the housing containing two terminal zones for electric contacting, which are electrically connected by means of the electrically conductive material of the housing, the electric connection of the terminal zones being separable by activating the explosive, and the explosive material being embodied as a deflagrating pyrotechnic substance which is provided in such an amount and is configured such that the electric connection of the terminal zones of the housing is separated in a predetermined time after the deflagrating pyrotechnic substance has been activated.

대표청구항 ▼

1. A pyrotechnic fuse element including:(a) a closed housing consisting of an electrically conductive material; (b) two terminal zones contained in the closed housing being electrically connected by means of the electrically conductive material of the closed housing; (c) an explosive material provid

1. A pyrotechnic fuse element including:(a) a closed housing consisting of an electrically conductive material; (b) two terminal zones contained in the closed housing being electrically connected by means of the electrically conductive material of the closed housing; (c) an explosive material provided in the closed housing, the electric connection of the two terminal zones being separable by activating the explosive material, and the explosive material being made of a deflagrating pyrotechnic substance provided in such an amount and configured such that the electric connection of the two terminal zones of the closed housing is separated in a predetermined time in response to the deflagrating pyrotechnic substance being activated; (d) a circumferential weakening portion extending over the entire periphery of an outer wall of the closed housing and formed in the thickness of the outer wall, the circumferential weakening portion having a predetermined axial extension between two cross sectional steps, and the circumferential weakening portion being configured to break out entirely at least in a partial area of the circumferential weakening portion between two defined peripheral lines in response to the deflagrating pyrotechnic substance being activated; and (e) a protective housing surrounds the closed housing and at least one part of the closed housing being axially movably held in the protective housing on one side of the circumferential weakening portion, the at least one part of the closed housing preferably including stop means at the outer periphery thereof which limit the axial movement of the closed housing after the circumferential weakening portion has broken out, and holding means being preferably provided which fix the at least one part after the at least one part has moved axially. 2. A pyrotechnic fuse element including:(a) a closed housing consisting of an electrically conductive material; (b) two terminal zones contained in the closed housing being electrically connected by means of the electrically conductive material of the closed housing; (c) an explosive material provided in the closed housing, the electric connection of the two terminal zones being separable by activating the explosive material, and the explosive material being made of a deflagrating pyrotechnic substance provided in such an amount and configured such that the electric connection of the two terminal zones of the closed housing is separated in a predetermined time in response to the deflagrating pyrotechnic substance being activated; (d) a circumferential weakening portion extending over the entire periphery of an outer wall of the closed housing and formed in the thickness of the outer wall, the circumferential weakening portion having a predetermined axial extension between two cross sectional steps, and the circumferential weakening portion being configured to break out entirely at least in a partial area of the circumferential weakening portion between two defined peripheral lines in response to the deflagrating pyrotechnic substance being activated; and (e) an electric conductor to penetrate the deflagrating pyrotechnic substance provided in the closed housing, the electric conductor being connected at both its ends, respectively, with one of the terminal zones, the conductor being configured such that its heating at a predetermined nominal current will activate the pyrotechnic substance. 3. A pyrotechnic fuse element including:(a) a closed housing consisting of an electrically conductive material; (b) two terminal zones contained in the closed housing being electrically connected by means of the electrically conductive material of the closed housing; (c) an explosive material provided in the closed housing, the electric connection of the two terminal zones being separable by activating the explosive material, and the explosive material being made of a deflagrating pyrotechnic substance provided in such an amount and configured such that the electric connection of the two terminal zones of the closed housing is separated in a predetermined time in response to the deflagrating pyrotechnic substance being activated; (d) a circumferential weakening portion extending over the entire periphery of an outer wall of the closed housing and formed in the thickness of the outer wall, the circumferential weakening portion having a predetermined axial extension between two cross sectional steps, and the circumferential weakening portion being configured to break out entirely at least in a partial area of the circumferential weakening portion between two defined peripheral lines in response to the deflagrating pyrotechnic substance being activated; and (e) a protective housing which is configured such that the ambience of the fuse element is protected when the outer wall of the closed housing breaks out during activation of the deflagrating pyrotechnic substance. 4. The pyrotechnic fuse element of claim 3 wherein the closed housing includes a substantially hollow cylindrical part with at least one opening that is closed by means of a substantially plug-like closure element.5. The pyrotechnic fuse element of claim 3 further including at least in partial areas of the inner wall of the closed housing which contact said deflagrating pyrotechnic substance, structures are provided which increase the surface effectively contacting said pyrotechnic substance and are configured such that in predetermined areas, locally higher temperatures or notch stresses are produced which facilitate the destruction of the circumferential weakening portion and cause smaller fragments.6. The pyrotechnic fuse element of claim 3 further including a controllable activating device for the deflagrating pyrotechnic substance.7. The pyrotechnic fuse element of claim 3 wherein the deflagrating pyrotechnic substance includes a first component which has a higher activating temperature than a second component.8. The pyrotechnic fuse element of claim 7 wherein at least the first component has an ageing stability which is sufficient for the period of time in which it is to be operable, and the ageing stability is provided in such an amount and configured such that, when the first component is activated, the first component alone is sufficient to interrupt the electric connection between the terminal zones.9. The pyrotechnic fuse element of claim 7 wherein the activating temperature of the first component is higher than the temperature which can be produced at least by partial areas of the closed housing at a nominal current intensity and the activating temperature of the second component is lower than the temperature which can be produced at least by partial areas of the closed housing at a nominal current intensity.10. The pyrotechnic fuse element of claim 3 wherein the predetermined axial extension of the circumferential weakening portion includes a wall thickness that is larger than zero and preferably larger than 1 mm and smaller than 5 mm.11. The pyrotechnic fuse element of claim 10 wherein the wall thickness in the area of the weakening portion is smaller than half the wall thickness of the portions adjacent the weakening portion and is preferably constant.12. The pyrotechnic fuse element of claim 3 wherein the circumferential weakening portion of the outer wall is configured such that, at a predetermined nominal current, a predetermined activating temperature for the deflagrating pyrotechnic substance can be produced in predetermined areas by the flow of current through the housing.13. The pyrotechnic fuse element of claim 3 wherein the deflagrating pyrotechnic substance and the closed housing are configured such that, at a predetermined nominal current intensity, a secure activation of the pyrotechnic substance by the heating of the closed housing, preferably in predetermined areas, is guaranteed.