Abstract: A lock device (10) is used with a flat key (K) having asymmetric opposite edges (3, 4). The lock device (10) includes a key rotor (14) which is configured to have distances from a central axis line (O2) of the key (K) to abutment points of the edges (3, 4) against the tumbler (32a-32c) respectively, and the distances are set so as to equal each other such that the non-reversible key is capable of reversible use in an inserted state of the key (K) into a key insertion hole (23).

Abstract: A lock device (10) is used with a flat key (K) having asymmetric opposite edges (3, 4). The lock device (10) includes a key rotor (14) which is configured to have distances from a central axis line (O2) of the key (K) to abutment points of the edges (3, 4) against the tumbler (32a-32c) respectively, and the distances are set so as to equal each other such that the non-reversible key is capable of reversible use in an inserted state of the key (K) into a key insertion hole (23).

Abstract: Provided is a starter motor control circuit capable of easily preventing the induction of a short-circuit current due to a ground fault in the power source line of a starter motor, in which a high current flows. A key switch (13) is connected with a battery (11), and a starter motor starting signal line (19) of a starter motor (18) is connected through a starter relay (16) with a start (ST) of the key switch (13). A protect relay (22) is disposed in a battery line (21) between the battery (11) and the starter motor (18). A ground fault detecting line (24) for detecting the ground fault of the battery line (21) is disposed between the battery line (21) and a controller (14). The controller (14) has a function to restrict the connecting actions of the starter relay (16) and the protect relay (22) when the ground fault of the battery line 21 is detected by a ground fault line (24), even if the key switch (13) is changed to the start (ST).

Abstract: A shutter type guard apparatus composed of a movable guard member which can be opened and closed for covering the window portion of the cab of a piece of machinery. The guard member is structured so that it can be closed to an intermediately opened position where it is easily operated. An auxiliary closing device includes a cable winding device for winding the first cable, a travelling unit coupled between the first cable and a second cable, an auxiliary guide rail in which the travelling unit and the first and second cables are guided for movement, and a pull handle coupled to the second cable. The auxiliary guide member is at one of a pair of left and right guide rails, for guiding the movable guard member. The pull handle is disposed at an intermediate position, in the vertical direction of the guide rail, and by pulling the pull handle downward, the guard member is forcibly closed to an intermediately opened/closed position where it can be easily reached and further closed by hand by an operator.