Abstract: A spirally wound tube for wrapping textiles or other materials thereon. The tube has an identification feature. The tube is made by spirally winding a number of plies together. The outermost ply defines a groove that substantially extends spirally along the length of the tube. The groove is for containing an identification marking for identifying the textile or other material wrapped onto the tube. In particular, the tube may include an identification stripe that extends along the groove. The identification stripe contains a marking system or identification markings to indicate the type or nature of the textile material wrapped on the tube. The marking system may include the color or colors of the stripe, or patterns, codes, readable indicia, or any combination of markings on the stripe.

Abstract: A spirally wound tube for wrapping textiles or other materials thereon. The tube has an identification feature. The tube is made by spirally winding a number of plies together. The outermost ply defines a groove that substantially extends spirally along the length of the tube. The groove is for containing an identification marking for identifying the textile or other material wrapped onto the tube. In particular, the tube may include an identification stripe that extends along the groove. The identification stripe contains a marking system or identification markings to indicate the type or nature of the textile material wrapped on the tube. The marking system may include the color or colors of the stripe, or patterns, codes, readable indicia, or any combination of markings on the stripe.

Abstract: A mass excited acoustic device (1100) includes a soundboard (1102), a pedestal (1104) and a transducer (300). The soundboard (1102) has a predetermined resonance frequency and couples motional energy to a device user. The pedestal (1104) includes a platform (1106) formed for mounting a transducer (300), and a foot (1108). The platform (1106) and foot have an axis extending centrally therethrough. The foot (1108) is contiguous to the platform (1106) and to the soundboard (1102), and is substantially smaller in size than the platform (1106) and separates the platform (1106) from the soundboard (1102). The transducer (300) is coupled to the platform (1106) about the axis and converts an electrical input signal into motional energy generated in a direction parallel to the axis. The motional energy is delivered to the soundboard (1102) through the foot (1108) without substantially modifying the resonance frequency of the soundboard (1102).

Abstract: A taut armature reciprocating impulse transducer (100) includes an electromagnetic driver (24, 26) which effects an alternating electromagnetic field in response to an input signal. An armature (12) includes an upper planar suspension member (14) formed by a first pair of non-linear spring members arranged along a first radial axis (50), and a lower planar suspension member (16) formed by a second pair of non-linear spring members arranged along a second radial axis (52) which is substantially perpendicular to the first radial axis (50). The upper and lower planar suspensions members are coupled to the electromagnetic driver (24, 26) and suspend a magnetic motional mass (18) therebetween. The alternating electromagnetic field alternately moves the magnetic motional mass (18), the movement being transformed through the upper and lower planar suspension members (14, 16) and the electromagnetic driver (24, 26) into motional energy.

Abstract: A taut armature resonant impulse transducer (100) includes an armature (12), an electromagnetic driver (24, 26) and a magnetic motional mass (18). The armature includes upper (14, 15) and lower (16, 17) cross-coupled non-linear resonant suspension members, each including first and second non-linear springs (62, 72) connected to a stepped central region and to opposite contiguous planar perimeter regions of an eIectromagnetic driver (24, 26) which effects an alternating electromagnetic field. A first end of the second non-linear spring is positioned within a periphery defining a shape of the first non-linear spring.

Abstract: A selective call receiver includes a vibrator (206) for generating alerts. The vibrator (206) includes a housing (402), a flexible member (2) within the housing (402) and coupled thereto, and a moving member (404) coupled to the flexible member (2) for movement about an equilibrium position, the moving member (404) including a permanent magnet (410). An actuator includes an electromagnet (412) for causing the permanent magnet (410) and the moving member (404) to move at a first frequency for generating an audible alert and at a second frequency for generating a sub-audible or tactile alert. The movement at the second frequency is substantially transferred to the housing (402) for generating the sub-audible or tactile alert.

Abstract: A ceramic filter including a plurality of ceramic plates contacted by metal plates and enclosed within a housing includes a Teflon membrane having a plurality of bubbles or dimples therein. A curved spring plate is positioned between a wall of the housing and one of the metal plates. The shock absorbing membrane is positioned between the spring plate and the wall of the housing, and the bubbles thereof extend through openings in the spring plate. When the filter is subjected to a force substantially perpendicular to the ceramic plates, the bubbles in the shock absorber cause the edges of the metal plate to deflect upwards and thus support the adjacent ceramic plate so as to avoid shattering or cracking.

Abstract: A battery contact (1) for connecting a battery (9) to an electric circuit (4) is comprised a first portion (2) for coupling to the electric circuit and a second portion (3) for coupling to the battery. The contact is made in one piece of electrically conductive sheet metal and is cut and bent so as to form the second portion into a tapered helical spring. The first portion (2) is formed with two retaining prongs (6,7) which facilitate locating and fixing the contact to the electric circuit (4) and a tab 8 which is used for soldering the contact to the electric circuit. In order to allow the contact to be easily picked-up in an automatic manufacturing line, a flat handling portion (11) is provided between the first and second portions.