Abstract: An acoustic antenna intended to equip a sonar, the antenna being centred around a first longitudinal axis and includes at least a first assembly of at least two transducers and a second assembly of at least two transducers stacked along the longitudinal axis, each transducer having at least a radial mode having a resonance frequency, referred to as the radial frequency, and a cavity mode having a resonance frequency, referred to as the cavity frequency, wherein the transducers of the first assembly are configured to transmit sound waves in a first continuous frequency band extending at least between the cavity and radial frequencies of the transducers of the first assembly and the transducers of the second assembly are configured to transmit sound waves in a second continuous frequency band extending at least between the cavity and radial frequencies of the transducers of the second assembly, in that the cavity frequency of a transducer of the second assembly is equal to the radial frequency of a transducer o

Abstract: An omnidirectional antenna to equip a sonar, the antenna centered around a longitudinal axis and comprises an assembly of emission rings stacked along the longitudinal axis, each emission ring formed around the longitudinal axis. The emission rings are assembled in groups of ring, the antenna comprises at least two groups of rings and each group of rings comprises at least two rings, the inter-ring spacings between the rings of one and the same group and the inter-group spacings between two successive groups of rings chosen so as to optimize the emission bandwidth and the sound level.

Abstract: A compact omnidirectional antenna for dipping sonar comprises multiple elementary transmission rings formed around a longitudinal axis of the antenna and multiple hydrophones distributed around the longitudinal axis, the antenna intended to be dipped in water, the hydrophones separate from the elementary transmission rings, the hydrophones and the elementary transmission rings fixed in the antenna. The elementary transmission rings and the hydrophones are interlinked along one and the same height (H) measured along the longitudinal axis.

Abstract: An omnidirectional antenna to equip a sonar, the antenna centered around a longitudinal axis and comprises an assembly of emission rings stacked along the longitudinal axis, each emission ring formed around the longitudinal axis. The emission rings are assembled in groups of ring, the antenna comprises at least two groups of rings and each group of rings comprises at least two rings, the inter-ring spacings between the rings of one and the same group and the inter-group spacings between two successive groups of rings chosen so as to optimize the emission bandwidth and the sound level.

Abstract: A compact omnidirectional antenna for dipping sonar comprises multiple elementary transmission rings formed around a longitudinal axis of the antenna and multiple hydrophones distributed around the longitudinal axis, the antenna intended to be dipped in water, the hydrophones separate from the elementary transmission rings, the hydrophones and the elementary transmission rings fixed in the antenna. The elementary transmission rings and the hydrophones are interlinked along one and the same height (H) measured along the longitudinal axis.

Abstract: A sealed compressor comprises a motor pump unit, a hermetic casing and means of electrical connection, the motor pump unit positioned inside the hermetic casing, the connection means allowing the motor pump unit to be powered electrically through the hermetic casing, the connection means comprising an earth rod and at least two power supply terminals. The connection means comprise a mobile housing and a power supply cable, the housing arranged at the end of the cable, connection of the housing to the earth rod and to the power supply terminals achieved in a translational movement in a direction of insertion. Connection of the housing to the earth rod comprises non-return means that prevent the housing from moving in an opposite direction to the direction of insertion.

Abstract: The invention relates to a chairlift seat (3), the width thereof extending in a transverse direction (I-I). The seat (3) is to be moved in a longitudinal direction (II-II) and comprises a bicycle (2) transport device (1) secured thereto. The transport device (1) includes supporting means (6) extending in a first direction (III-III) substantially parallel to the transverse direction (I-I) of the seat (3). At least one receiving and holding device (8), carried by the supporting means (6), is shaped such as to receive and hold at least one first wheel (2a) of a bicycle (2) oriented in a plane (P) substantially perpendicular to the first direction (III-III). The transport device (1) is arranged behind the seat (3).

Abstract: The invention relates to a chairlift seat (3), the width thereof extending in a transverse direction (I-I). The seat (3) is to be moved in a longitudinal direction (II-II) and comprises a bicycle (2) transport device (1) secured thereto. The transport device (1) includes supporting means (6) extending in a first direction (III-III) substantially parallel to the transverse direction (I-I) of the seat (3). At least one receiving and holding device (8), carried by the supporting means (6), is shaped such as to receive and hold at least one first wheel (2a) of a bicycle (2) oriented in a plane (P) substantially perpendicular to the first direction (III-III). The transport device (1) is arranged behind the seat (3).

Abstract: An underwater acoustic transducer configured to emit a low-frequency broadband acoustic signal. The underwater acoustic transducer includes a cap in the form of a cylinder closed on one side and open on the other side. A piezoelectric plate operating in flexion is fixed on the base of the cylinder outside the cylinder. The inside cavity defined by the cylinder is open freely toward the outside medium in which the acoustic waves are to be emitted. For identical dimensions, the underwater acoustic transducer makes it possible to decrease a central frequency of emission and to increase bandwidth.

Abstract: Acoustic transmitting antennas in the form of circular rings. Several circular rings which can be dismantled of a known type are superimposed in a stack. The stack is terminated at each end by two profiled annuli. The threaded tie-rods traverse the stacks of the pre-stressing keys of the rings by the intermediary of holes drilled in these keys. The threaded tie-rods make it possible to ensure the holding of the assembly. Two jackets, inside and outside, made of rubber, cover the inside and outside faces of the stack and are anchored in grooves formed in the profiled annuli. Thereby, annular transmitting antennas can be provided which can be dismantled entirely and whose active mass to inactive mass ratio is particularly large.