Abstract: A shutter blade device having two arms, plural shutter blades and caulking pins for rotatably mounting the shutter blades to the arms is designed to secure the strength of the shutter blades, thereby enabling high-speed running motion. For this purpose, the shutter blades are formed planar, and the caulking pins are so caulked that the caulked portions protrude to the rear side of the shutter blades. Between the adjacent shutter blades, blades are so formed that the protruding portions of caulking always overlap with the adjacent shutter blade, regardless whether the blades are in the light-shielding position, in the exposure position or in the course of running therebetween.

Abstract: A violin, viola or the like shoulder rest has a firm elongated base (21,81) provided at each end thereof with an upwardly projecting support of a clamping assembly (38-41; 88-90; 96-98) for securement of the shoulder rest to a violin or viola. The supports are firmly held by the base but are foldable such that the clamps (38-41; 88-90; 96-98) are pivoted toward each other and on top of the base (21, 81) into a generally flush arrangement with the top surface (22) of the base to facilitate storage of the shoulder rest when not in use. Two preferred embodiments are dislosed.

Abstract: A musical instrument pick including a metal bar extending along the top of a conventionally shaped pick body. At one end of the metal bar, there is a rounded bevelled end which is used by holding the pick upside down at an angle of 45.degree.. The bevelled end is used to perform arpeggio sweeps. At the opposite end of the metal bar, a tapered surface terminating in a point is provided for fast picking. On lateral surfaces of the metal bar are provided grooves for receiving the thumb and forefinger, respectively, of the user. The top edge of the metal bar is rounded useful to perform "slide" and "finger tapping" techniques.

Abstract: This disclosure is of a novel drum, specifically a snare drum which is capable of producing a definite pitch or note. The prior art drums did not produce a definite or definitive pitch. This disclosure is of a drum and the process of assembling it with a seamless shell, the skin being held tautly over the machined bearing surfaces of said shell. The drum may be tuned to other definite pitches by a tuning mechanism between the lugs on the hoop holding the skin firmly against the bearing surface of the shell and tuning lugs attached to the shell. The lugs in the shell holding the tuning means are also made of metal to enhance the tonal response of the seamless shell. The snare bed is enlarged both in width and depth and is a part of a machined bearing surface to also enhance the tonal response of the snare.

Abstract: A ligature for a mouthpiece of a wind instrument includes a body of an elastically deformable material which is complimentary in shape to a form of the mouthpiece so as to encircle the mouthpiece and a reed disposed between the mouthpiece and the ligature. The body has two opposing portions and the ligature further includes a manually operated fastening arrangement for connecting the two opposing portions to each other and for moving the two opposing portions substantially perpendicular to a longitudinal axis of the mouthpiece to tighten and loosen the ligature about the mouthpiece.

Abstract: A music box comprising a blower unit and a flute unit. Each flute in the flute unit includes a mouth and a wind inlet hole for feeding air to the mouth and the wind inlet holes for feeding air to the flute are selectively opened/closed to produce a desired melody. Further, an air outflow hole is provided in a wind trunk of the blower unit and a disk having holes for cyclically opening/closing the hole is rotatably provided. Thus the pressure of wind fed to each flute changes at a predetermined interval of time. As a member for recording a melody, the following two methods are available. One method is a disk having protrusions for pressing the key members of the flute unit and another method is a film member which opens/closes the air inlet hole of the flute unit.

Abstract: The present invention relates to a pneumatic tool having superior sound muffling performance. The pneumatic tool has an exhaust port, wherein a sound muffling structure comprising a nonwoven web of fibers coated with a binder resin, is fitted in said exhaust port to seal said exhaust port, wherein said fibers have diameters of about 30 to about 100 microns and wherein the web has a compression resistance energy of about 0.09 to about 0.14 Joules.

Abstract: A new and improved method and apparatus for an acoustical partition are presented. The acoustical partition comprises a wall section defining an enclosed space, a frame structure contained within the wall section, and an insulation layer contained within the frame structure such that an air cavity is created at the centermost area within the wall section. The acoustical partition may also include a sound absorption layer placed on a front side of the wall section, and a fabric layer positioned over the sound absorption layer in such a way as to provide an airspace between the sound absorption layer and the fabric layer.

Abstract: A camera has a deployable cartridge receiving chamber that is supported for opening movement unidirectionally about one pivot and bidirectionally about another pivot point.

Abstract: When an exposure counter in a single-use camera indicates that the maximum number of exposures on a roll of film in the camera have been exposed, a function of the camera such as an electronic flash capability is disabled to prevent unauthorized recycling of the camera. A reset code must be inputted to the camera to initialize the exposure counter and to enable the electronic flash capability, to permit authorized reuse of the camera with another roll of film.

Abstract: An acoustical door including a multiple ply core with individual plies separated from one another by intervening spacer networks. The networks provide generally uniform sound damping spaces between the core plies and are glued in position between the plies to bond the core together.

Abstract: A magnetic recording-reproducing circuit in a camera includes a magnetic head for reproducing information recorded on a magnetic recording portion, a first amplifying circuit having at least two input ends, the output of the magnetic head being connected to one of the input ends of the first amplifying circuit, a second amplifying circuit having at least two input ends, the output of the magnetic head being connected to one of the input ends of the second amplifying circuit, a first impedance for connecting the other input end of the first amplifying circuit and the other input end of the second amplifying circuit together, a second impedance for connecting the other input end and the output end of the first amplifying circuit together, and a third impedance for connecting the other input end and the output end of the second amplifying circuit together.

Abstract: A photographic film strip has a leader and a trailer, and is to be contained in a cassette having a rotatable spool. A first group of anchoring holes is formed in the trailer along a distal edge thereof, to be anchored on the spool. A second group of anchoring holes is formed at a position which is displaced from the first anchoring hole group toward the leader, and is utilized when the film strip is contained in a preserving cassette after development. In a preferred embodiment, a train of metering perforations are formed along a first lengthwise edge of the photographic film strip of regular intervals so as to be detected by a camera in order to detect positions of original frames. A plurality of take-up holes are formed in the leader, and adapted to being caught by a take-up spool of a camera. The take-up holes are out of alignment with the perforations. The camera has a cassette chamber.

Abstract: A foot-pedal device of a high-hat cymbal comprises a sleeve provided therein with a compression spring capable of forcing the upper cymbal of the high-hat cymbal to join intimately with the lower cymbal at such time when the foot-pedal mechanism of the high-hat cymbal is disengaged so as to permit a musician to strike the high-hat cymbal with a stick for producing a variety of rhythmic accents.

Abstract: A mounting structure and methodology for mounting audio speakers in the package shelf of a motor vehicle. The speakers are mounted in a well formed integrally with the package shelf. The well opens at its upper end in the package shelf and defines an annular ledge at its lower end sized to seat the annular flange of the speaker. Resilient spring fingers on the annular wall of the well flex outwardly in response to insertion of the speaker into the well to allow passage of the speaker flange and thereafter, upon seating of the speaker flange on the ledge, flex inwardly to lockingly clamp the speaker flange between the spring fingers and the ledge. A grille structure includes a grille sized to fill the opening in the package shelf and a plurality of fingers extending downwardly from the grille and sized to fit within the well structure.

Abstract: An image forming apparatus includes a detachably mountable process cartridge, the process cartridge including an image bearing member and a color developing device actable on the image bearing member, the color developing device containing plural developing units having yellow developer, respectively; detachably mountable developing device actable on the image bearing member in the process cartridge, the detachably mountable developing device containing black developer and being detachably mountable independently of the process cartridge; and a device for forming a latent image on the image bearing member; a transfer device for transferring a developed image from the image bearing member to a recording material.

Abstract: For use in mounting a speaker on a wall member, such as a rear corner pillar, of a vehicle, such as a van, minivan, or station wagon, a molded speaker mounting bracket adapted to being speaker mounted on the pillar. The molded bracket includes speaker receiving segment and three legs extending from the receiving segment for being heat welded onto a surface of the corner pillar. The speaker receiving segment is contoured to include a first square portion, a second frustoconical portion, and a third internal flange portion, with an upwardly converging open front terminating in upper corners positioned a predetermined distance apart, adapted to having a speaker snapped past the upper corners by spreading same and thereafter being securely retained by the first, second and third contoured portions.

Abstract: A retracting guitar pick holder. Other patented designs of guitar pick holders are wholly different from mine, in that no designs besides mine hold a guitar pick in a readily available position. My pick holder consists of a wrist band (cloth, leather, or the like), onto which is fastened a tube, which extends to over the hand, and ends a little above the thumb and index finger, slightly in back of the tip of the thumb. The tube is hollow, and inside is an elastic cord which is fastened at the wrist end of the tube. At the fingers end, the cord is attached either to the pick, or to a clasp which is used to hold the pick.

Abstract: A drum comprising a shell, a pair of skins (12) disposed at opposite ends of the shell, and substantially free floating tensioning assembly (30) to stretch the skins over the respective ends of the shell. The tensioning assembly comprises respective engagement means adapted to grip the periphery of each skin, a stabilizing ring (32) extending around the shell intermediate its ends, and a plurality of adjustable peripherally spaced tensioning elements (35) extending intermediate the respective engagement means and the stabilizing ring. The tensioning assembly is disposed to transfer tension directly between the skins substantially independently of the shell, thereby facilitating tuning and permitting substantially undamped vibration of the shell.

Abstract: A silencer arrangement for a combustion engine (1) whose exhaust gases are discharged via an exhaust pipe (3) comprises a microphone (9), a tachometer (11) for the engine speed, a control unit (13) and a loudspeaker enclosure (19). The loudspeaker enclosure accommodates two loudspeakers (15, 17) secured to a partition (21). The partition divides the volume of the loudspeaker enclosure into two subvolumes (23, 25). The subvolumes communicate with one another via a tube (27) in order to reduce the electric power required to obtain the desired acoustic power of the sound emitted by the loudspeaker enclosure. One of the subvolumes (25) is acoustically coupled to a tube (33). One end (35) of the tube is situated near the end (7) of the exhaust pipe (3). The sound issuing from the loudspeaker enclosure via the tube interferes with the exhaust-gas sound. A Helmholtz resonator (41) is acoustically coupled to the tube (33) in order to suppress undesired resonances in the tube (33).