Abstract: A plug-in connector includes a connector main body having contacts connected to a cable, and a housing accommodating the connector main body. Latch springs are respectively attached to first and second surfaces of the housing, and respectively have first engagement portions which engage, in a locked state, second engagement portions of a jack connector to be connected with the plug-in connector. An operating member, which cooperates with the latch springs, includes latch releasing portions respectively engaging with the latch springs and disengaging the latch springs from the second engagement portions when the plug-in connector is pulled whereby the plug-in connector is released from the locked state.

Abstract: An apparatus for recording information on concentric circular recording tracks on a rotatable magnetic recording medium and/or reproducing the information from the recording tracks comprises a magnetic head provided in opposed relationship with the recording medium, a rotatable member, a driving device for intermittently rotating the rotatable member by a predetermined angle, a lever having a pivot shaft and intermittently pivoting in a predetermined direction about the pivot shaft by a unit pivot angle corresponding to the predetermined angle in response to the rotatable member, and a mechanism for intermittently moving the magnetic head in one direction on a straight line passing through the center of rotation of the recording medium in response to the pivoting lever, the head moving mechanism converting the pivotal displacement of the pivoting lever into rectilinear displacement.

Abstract: A core mold for bent pipes including a main body formed of a plurality of hollow cylindrical members connected to each other, the angle between adjacent hollow cylindrical members being fixable at any desired value. The main body may be mounted to a shaft through support members each of which consists of a main body fixed to the main body of the core mold and a shaft support member secured rotatably to the main body of the support member, the shaft support member being slidable along the shaft.

Abstract: In a camera having a camera housing, an objective optical system disposed on a front face of the camera housing, and a protective cover slidable along the front face of the camera housing between a position for covering the optical system and a position for exposing the optical system, the front face of the camera housing has on the left and right sides of the objective optical system a pair of gripping portions by which the camera may be held during photography and the protective cover is slidable vertically between the pair of gripping portions.

Abstract: Apparatus and method for molding a reinforced plastic tubular body having a socket, and a mold for carrying out the method. The steps of the method areassembling a main mold body having a tubular section and a socket-molding member slidable axially along the periphery of the tubular section of the main body and fixable at a predetermined position to the tubular section of the main body to form a mold by fixing the socket-molding member at the predetermined position to the tubular section of the main body,forming a layer of a reinforced plastic molding material around the resulting mold and curing it, andpulling the main mold body and the socket-molding member axially from the cured plastic layer.

Abstract: In a film feeding device of a camera including a preparatory wind-up device for winding up on a supply spool, before exposure, a roll film in a film magazine loaded into the camera, and a second wind-up device for rewinding into the magazine the unexposed film wound on the supply spool, there is provided means for detecting the completion of the wind-up, by the preparatory wind-up device, of all of the film which is drawn out of the film magazine and can be wound up on the supply spool, and change-over means for blocking and releasing the operation of the second wind-up device.

Abstract: In a film feeding device of a camera including a take-up spool adapted to be rotated by a wind-up operating device to thereby take up on the outer periphery thereof a roll film loaded into a supply chamber, the film having an image recording portion and a leader portion of a smaller width than the recording portion, the image recording portion being taken up in subsequence to the take-up of the leader portion onto the take-up spool, the take-up spool having an outer peripheral surface which is not covered with the leader portion but can be covered only with the image recording portion, there is provided means cooperable with the outer peripheral surface of the take-up spool to detect the take-up of the film, the detecting means including signal means provided on said outer peripheral surface and signal detecting means engageable with the signal means and removed from said outer peripheral surface by the intervention of the image recording portion of the film with respect to said outer peripheral surface, and

Abstract: A prime mover control apparatus for controlling a primer mover including a pump turbine or a water turbine driving a generator to be synchronously connected to a power system, is disclosed. In this control apparatus, immediately after the synchronous connection of the generator to the power system, the opening of the guide vanes of the turbine is increased to exceed a predetermined value at which the turbine is not placed in the motoring mode, and then, the speed governor is controlled to drive the turbine at the speed corresponding to the standard frequency of the voltage in the power system.

Abstract: A battery case has a main switch device in a lid which is capable of being coupled to a battery chamber body. The main switch device is operable, when coupled to said body, so as to interrupt the connection between the two electrodes of a battery. The lid includes a frame member engageable with the battery chamber body and having an inner wall and an outer wall, a pair of electrode contacts extending through the inner wall, and switch operating means having a switch member and an operating member. The main switch device may be reliably closed and opened. With the main switch device, the dust-proof and moisture-proof properties of the battery case are not impaired.