Abstract: Provided is an insertion guide that performs accurate rotation correction between a shaft and a hole and phase correction between the shaft and hole. The shaft includes: a first guide portion at a distal end of the shaft having a diameter smaller than a diameter of the hole; a second guide portion, provided on a base end side of a first narrow cylindrical portion, and having a diameter smaller than the diameter of the hole and larger than a diameter of the first narrow cylindrical portion; and a third guide portion, provided at the distal end of the shaft, and is a recessed portion to be engaged with a protruding portion formed in the hole. The shaft being inclined with respect to the hole, is brought into contact with the hole at two points or less before the third guide portion is brought into contact with the protruding portion.

Abstract: A parallel link device whose height can be reduced particularly when a movable-side member is brought closer to a fixed-side member, and in which an amount of stroke of the movable-side member can be increased. Specifically, the parallel link device includes a fixed-side member, a movable-side member, six links, and slide mechanisms. Each of the six links has one end connected to the movable-side member with at least two rotational degrees of freedom, and the other end connected to the fixed-side member with at least two rotational degrees of freedom. A connection point of the other end and the fixed-side member is movable with respect to the fixed-side member. Each of the six links has five rotational degrees of freedom and a predetermined length. Each of the slide mechanisms is provided on the fixed-side member and holds the other end of the link movable within a predetermined range.

Abstract: A mirror replacement device includes a gripping mechanism to grip a segment mirror, a fine drive mechanism to change a position and a posture of the gripping mechanism, a lift mechanism for the segment mirror, a first detector to detect a relative position and a relative posture between a comparison object and a target object, a second detector to detect a bend of the fine drive mechanism, and a mirror replacement controller to replace the segment mirror based on detection signals output from the above-mentioned detectors. The controller determines whether the first detector can successfully perform a measurement. When it is determined that the measurement can be successfully performed, the control is performed based on the detection signal output from the first detector. When it is determined that the measurement cannot be successfully performed, the control is performed based on the detection signal output from the second detector.

Abstract: A base isolation unit includes a vibration-source connector to be connected with a structure subjected to seismic vibration, an isolated-object connector to be connected with an object to be isolated from vibration, and located at a predetermined distance from the vibration-source connector in a predetermined base isolation direction, and a movement regulator. The movement regulator is located between the vibration-source connector and the isolated-object connector and includes an elastic body applied with a preload and subjected to a pressure caused by an external force in the base isolation direction. The movement regulator keeps the distance unchanged when the external force is equal to or less the preload, and changes the distance by making the vibration-source connector movable when the external force exceeds the preload.

Abstract: An antenna device includes a main-reflector including a main-reflector hole, an additional main-reflector, a sub-reflector, and an additional sub-reflector. The main-reflector surrounds an outer edge of the additional main-reflector, and has a reflective surface on the same side as the additional main-reflector. The sub-reflector faces the main-reflector hole on the reflective surface side of the additional main-reflector, and has a reflective surface facing the reflective surface of the additional main-reflector. The additional sub-reflector surrounds an outer edge of the sub-reflector, and has a reflective surface on the same side as the sub-reflector.

Abstract: An antenna device includes a main-reflector including a main-reflector hole, an additional main-reflector, a sub-reflector, and an additional sub-reflector. The main-reflector surrounds an outer edge of the additional main-reflector, and has a reflective surface on the same side as the additional main-reflector. The sub-reflector faces the main-reflector hole on the reflective surface side of the additional main-reflector, and has a reflective surface facing the reflective surface of the additional main-reflector. The additional sub-reflector surrounds an outer edge of the sub-reflector, and has a reflective surface on the same side as the sub-reflector.

Abstract: An antenna apparatus is provided which has a centroid close to a vibration isolation structure and which is hard to vibrate like a pendulum motion when vibration is applied. The antenna apparatus includes a first base plate, an antenna unit disposed at a side of the first base plate and supported by the first base plate, and a counter weight unit disposed at another side of the first base plate opposite to the antenna unit and supported by the first base plate. The antenna apparatus further includes a vibration isolation structure having one end fixed to the first base plate to suppress a vibration of the first base plate, and a second base plate to which other end of the vibration isolation structure is fixed and which is fixed to a moving object or a structural object.

Abstract: An air-cooled engine for a working machine includes a fan cover, a muffler protector, and an insulator. The fan cover has a guide opening for guiding a cooling air toward an exhaust muffler. The muffler protector has air discharge holes for discharging the cooling air, which has been introduced through the guide opening into a guide passage, in a direction away from the working machine. The insulator has a deflector section bent toward a carburetor so that the cooling air having passed through another guide passage between the insulator and cylinder barrel is guided by the deflector section in a direction away from the working machine.

Abstract: The primary mirror support structure comprises an EL rotation structure including two arc-shaped members, a truss structure frame, and a primary mirror support structure. The arc-shaped members face each other via the EL axis and supporting the primary mirror, each of which rotates about the EL axis along an outer surface so as to rotate the primary mirror about the EL axis. The truss structure frame is connected to either one of the arc-shaped members at the ends. The primary mirror support structure includes multiple support members connecting multiple points on the circumference of the primary mirror provided above the truss structure frame to the truss structure frame. At least the support members nearest to the arc-shaped members are connected to the truss structure frame at parts different from the ends at which the truss structure frame is connected to the arc-shaped members.

Abstract: Breather mechanism includes a breather passage opening into a crankcase, a breather chamber communicating with the crankcase via the breather passage, and a valve provided in the breather chamber and openable to allow blow-by gas to flow from the crankcase into the breather chamber once inner pressure of the crankcase exceeds a predetermined value. When the engine is placed in a laterally laid-down position, entry, into the breather chamber, of lubricating oil is prevented by the breather passage. When the engine is placed in a vertically upright position, an outlet end portion of the breather passage is located above an inlet end portion of the breather passage.

Abstract: An air-cooled engine for a working machine includes a fan cover, a muffler protector, and an insulator. The fan cover has a guide opening for guiding a cooling air toward an exhaust muffler. The muffler protector has air discharge holes for discharging the cooling air, which has been introduced through the guide opening into a guide passage, in a direction away from the working machine. The insulator has a deflector section bent toward a carburetor so that the cooling air having passed through another guide passage between the insulator and cylinder barrel is guided by the deflector section in a direction away from the working machine.

Abstract: An antenna apparatus which has the centroid close to a base and which has a less constraint for placement of a counter weight. The antenna apparatus includes a base fixed to a moving object or a structural object, an antenna unit disposed at a side of the base and supported by the base, and a counter weight unit disposed at a side of the base opposite to the antenna unit and supported by the base.

Abstract: An antenna apparatus is provided which has a centroid close to a vibration isolation structure and which is hard to vibrate like a pendulum motion when vibration is applied. The antenna apparatus includes a first base plate, an antenna unit disposed at a side of the first base plate and supported by the first base plate, and a counter weight unit disposed at another side of the first base plate opposite to the antenna unit and supported by the first base plate. The antenna apparatus further includes a vibration isolation structure having one end fixed to the first base plate to suppress a vibration of the first base plate, and a second base plate to which other end of the vibration isolation structure is fixed and which is fixed to a moving object or a structural object.

Abstract: The primary mirror support structure comprises an EL rotation structure including two arc-shaped members, a truss structure frame, and a primary mirror support structure. The arc-shaped members face each other via the EL axis and supporting the primary mirror, each of which rotates about the EL axis along an outer surface so as to rotate the primary mirror about the EL axis. The truss structure frame is connected to either one of the arc-shaped members at the ends. The primary mirror support structure includes multiple support members connecting multiple points on the circumference of the primary mirror provided above the truss structure frame to the truss structure frame. At least the support members nearest to the arc-shaped members are connected to the truss structure frame at parts different from the ends at which the truss structure frame is connected to the arc-shaped members.

Abstract: A bearing holder (66) having a bearing (67) rotatably supporting a crankshaft (14) is fixed so as to face an opening (11k) of the engine case (11). A gas-liquid separation chamber (83) is formed between a cover member (68) covering the opening (11k) and the bearing holder (66). Therefore, by utilizing the bearing holder (66) as a part of the wall surface of the gas-liquid separation chamber (83), the gas-liquid separation chamber (83) can be partitioned without increasing the number of components and without forming a special wall surface in the engine case (11). Thus, it is possible to reduce the size and weight of the engine case (11), and reduce the cost by simplifying the shape thereof and reducing the number of components. Also, a labyrinth 82 is formed by ribs (66d, 66e, 68a, 68d) projecting from the bearing holder (66) and the cover member (68), and therefore gas-liquid separation can be effectively performed by the labyrinth (82).

Abstract: In an engine valve operating system, a timing transmission chamber (48) is formed on one side of an engine main body; the timing transmission chamber (48) houses a timing transmission system (37) that provides a connection between a crankshaft (12) and a camshaft (36) disposed above intake and exhaust valves (29i, 29e); opposite end parts of the camshaft (36) are supported by one side wall (5a) of a cylinder head (5) and a dividing wall (5b) that is adjacent to the timing transmission chamber (48); and a valve operating chamber (49) housing the camshaft (36) is defined between said one side wall (5a) and the dividing wall (5b). An oil slinger (72) is disposed in a lower part of the timing transmission chamber (48). An oil passage hole (75) is provided in the dividing wall (5b), the oil passage hole (75) guiding scattered oil that has been shaken off in an upper part of the timing transmission system (37) to the valve operating chamber (49).

Abstract: Breather mechanism includes a breather passage opening into a crankcase, a breather chamber communicating with the crankcase via the breather passage, and a valve provided in the breather chamber and openable to allow blow-by gas to flow from the crankcase into the breather chamber once inner pressure of the crankcase exceeds a predetermined value. When the engine is placed in a laterally laid-down position, entry, into the breather chamber, of lubricating oil is prevented by the breather passage. When the engine is placed in a vertically upright position, an outlet end portion of the breather passage is located above an inlet end portion of the breather passage.

Abstract: A bearing holder (66) having a bearing (67) rotatably supporting a crankshaft (14) is fixed so as to face an opening (11k) of the engine case (11). A gas-liquid separation chamber (83) is formed between a cover member (68) covering the opening (11k) and the bearing holder (66). Therefore, by utilizing the bearing holder (66) as a part of the wall surface of the gas-liquid separation chamber (83), the gas-liquid separation chamber (83) can be partitioned without increasing the number of components and without forming a special wall surface in the engine case (11). Thus, it is possible to reduce the size and weight of the engine case (11), and reduce the cost by simplifying the shape thereof and reducing the number of components. Also, a labyrinth 82 is formed by ribs (66d, 66e, 68a, 68d) projecting from the bearing holder (66) and the cover member (68), and therefore gas-liquid separation can be effectively performed by the labyrinth (82).