Abstract: A sliding bearing supporting a crankshaft journal portion of an internal combustion engine includes a semi-cylindrical bearing half provided with a circumferential oil groove on its inner surface. The circumferential oil groove has an open groove end at least at one of its two circumferential ends, one end being in the rotational direction of the crankshaft. The other cylindrical bearing half has at least one circumferential local groove on its inner circumferential surface with an open groove end at a second circumferential end directed in the opposite direction to the relative rotational direction of the crankshaft. The circumferential oil groove and the local circumferential groove are in fluid communication at a region where groove bottom of the local circumferential groove deviates toward the sliding bearing from another groove bottom of the circumferential groove. An axial groove is formed along a contact interface between the first and second circumferential ends.

Abstract: There is provided a slide bearing for a crankshaft of an internal combustion engine, having a pair of half bearings combined with each other to form the slide bearing, and a crush relief formed in each end portion region in a circumferential direction of an inner peripheral surface of each half bearing by reducing a bearing wall thickness over an entire width in an axial direction of the half bearing, wherein a relief depth RD which is a reduction amount of the bearing wall thickness of the crush relief is maximum at each end portion in the circumferential direction of the half bearing, and gradually decreases toward a center in the circumferential direction, and the relief depth RD is maximum in a center in an axial direction of the half bearing, and gradually decreases toward both end portions in the axial direction.

Abstract: Disclosed is a feature that collects dust particles that arise from a processing operation of an impact tool. The dust collection device collects dust that arises from of a processing operation and is attached to the impact tool that performs a pre-determined processing operation on a processed member by way of a tool bit mounted to the tip region of the tool body being linearly operated at least in the lengthwise direction. The dust collection device has a dust collection unit of which the tip opens as a dust intake port and the contour shape is formed unevenly around the long axis of the tool bit. The position of the dust collection unit is freely selected around the long axis of the tool bit, and it is possible to cause the position to change around the long axis of the bit.

Abstract: A dust collection device, that collects dust particles generated by an impact tool, has a feature that enables the attachment of the device to the impact tool, which is not provided with an attachment section for the device. The dust collection device has a tool body and an auxiliary handle, attached removably to the tool body, and is attached to an electric hammer that, in the lengthwise direction, linearly operates a tool bit mounted to the tip region of the tool body, and collects dust generated by the electric hammer. The dust collection device has: a dust collection unit that has a dust intake port at the tip; a dust collection hose, connected to the dust collection unit, for transferring dust to the downstream side; and a hose-holding unit that holds the dust collection hose. The hose-holding unit can be attached to and removed from the auxiliary handle.

Abstract: A feature that contributes to an improvement in the attachment to an impact tool of a dust collection device that is attached to the impact tool and that collects dust particles that said impact tool generates. The dust collection device collects dust that the impact tool generates and is attached to said impact tool that, in the lengthwise direction, linearly operates a tool bit that is mounted to the tip region of a tool body. The dust collection device has: a dust collection unit that has a dust intake port at the tip; and a dust transfer unit that is connected with the dust collection unit in order to transfer dust sucked in from the dust intake port towards the downstream side. The dust collection unit is held by the shaft section of the tool bit, and the dust transfer unit is held by the tool body.

Abstract: A split-type sliding bearing for a crankshaft in an internal combustion engine fits within a bearing housing having a housing half with a higher thermal expansion coefficient, and a housing half with a lower thermal expansion coefficient. The pair of semi-cylindrical bearings includes first and second semi-cylindrical bearings, the first being supported on the housing half having a higher thermal expansion coefficient, and the second being supported on the housing half having a lower thermal expansion coefficient. The first and second semi-cylindrical bearings have equal outer diameter, and the first has circumferential ends having a thickness smaller than that of the opposite circumferential ends of the second semi-cylindrical bearing.

Abstract: In a housing of a power tool is formed a hook-receiving portion, with openings facing leftward and rightward, through which a substantially U-shaped hook having a left hook leg and a right hook leg is movable among a left protruding position in which the left hook leg protrudes leftward from the hook-receiving portion, a right protruding position in which the right hook leg protrudes rightward from the hook-receiving portion, and an accommodating position in which the left and right hook legs are both accommodated in the hook-receiving portion. Also provided in the housing is a retaining mechanism by which the hook is retainable in one of the positions of the left protruding position, right protruding position, and accommodating position.

Abstract: A power tool that includes a driving motor and a power transmitting mechanism. The power transmitting mechanism includes a first clutch cam part, a second clutch cam part, clutch teeth, a clutch detecting mechanism and a controller that can control the driving motor in a first control mode in which the driving motor is controlled to rotate at a first rotation speed until before the first and second clutch cam parts are engaged with each other at the clutch teeth and in a second control mode in which the driving motor is controlled to rotate at a second rotation speed higher than the first rotation speed after the first and second clutch cam parts are engaged with each other at the clutch teeth.

Abstract: The power tool has a power transmitting mechanism. When a tool bit is not pressed against a workpiece, the power transmitting mechanism is held in a power transmission interrupted state, and when the tool bit is pressed against the workpiece, the power transmitting mechanism is held in a power transmission state in which the tool bit moves together with the driven-side member in an axial direction of the tool bit so that the driving-side member receives the torque from the driven-side member and the tool bit is driven. Tapered portions are provided between the driving-side member and the driven-side member and inclined with respect to the axial direction of the tool bit. When the driven-side member moves in the axial direction of the tool bit, frictional force is caused on the tapered portions and the torque of the driving-side member is transmitted to the driven-side member by the frictional force.

Abstract: A sliding bearing has a pair of semi-cylindrical bearings assembled together to form a cylindrical configuration. At least one of the semi-cylindrical bearings is provided with an inner surface circumferentially extending oil groove extending a central portion of the circumferential length of the semi-cylindrical bearing. A bottom surface of the oil groove has an ups and downs form consisting of a plurality of ridges and valleys, which sinusoidally undulate consecutively without a flat portion therebetween. The dimensional relationship between a typical ridge and the adjacent valleys is defined by the formula h<0.15H where H indicates the groove depth and h indicates an elevation difference of the ups and downs of the bottom surface, namely a height of the ridges where h is preferably not less than 10 ?m.

Abstract: A handheld electrical power tool may include a plurality of grasping portions, and at least one manipulating member to actuate and deactuate a drive source of the electrical power tool. The at least one manipulating member is positioned to correspond to all of the grasping portions.

Abstract: There is provided a slide bearing for a crankshaft of an internal combustion engine, having a pair of half bearings combined with each other to form the slide bearing, and a crush relief formed in each end portion region in a circumferential direction of an inner peripheral surface of each half bearing by reducing a bearing wall thickness over an entire width in an axial direction of the half bearing, wherein a relief depth RD which is a reduction amount of the bearing wall thickness of the crush relief is maximum at each end portion in the circumferential direction of the half bearing, and gradually decreases toward a center in the circumferential direction, and the relief depth RD is maximum in a center in an axial direction of the half bearing, and gradually decreases toward both end portions in the axial direction.

Abstract: Disclosed is a sliding bearing for supporting a crankshaft journal portion of an internal combustion engine. One of the semi-cylindrical bearings is provided with a circumferential oil groove on its inner circumferential surface, and has two circumferential ends. The circumferential oil groove has an open groove end at at least one of the two circumferential ends, which one is a first circumferential end being directed to the same direction as a relative rotational direction of a crankshaft. The other semi-cylindrical bearing is provided with at least one circumferential local groove on its inner circumferential surface, and has two circumferential ends. The circumferential local groove has an open groove end at one of the two circumferential ends, which one is a second circumferential end being directed to the opposite direction to the relative rotational direction of the crankshaft. The circumferential oil groove and the local circumferential groove are in fluid communication with each other.

Abstract: A semiconductor switch circuit is provided that enables current consumption to be reduced even in a conduction state. A semiconductor switch circuit 100 has P-type MOS transistors Q101 and Q102 for conduction that share a source and are connected in series between an input/output terminal 101 and input/output terminal 102, a P-type MOS transistor Q103 and N-type MOS transistor Q105 having drains connected to the gate of Q101, a P-type MOS transistor Q104 and N-type MOS transistor Q106 having drains connected to the gate of Q102, and a control terminal 103 connected to the gates of the transistors. Further semiconductor switch circuit 100 is configured with the sources and back gates of Q103 and Q104 connected to the sources of Q101 and Q102. Therefore, it is possible to switch the path between input/output terminal 101 and input/output terminal 102 between a conduction state and non-conduction state by means of voltage control by voltage value Vcont of a control signal applied to control terminal 103.

Abstract: It is an object of the invention to improve usability of a movable handle, in a sander having the movable handle. The sander includes a rotary working surface, a driving mechanism that is disposed above the rotary working surface in a direction of a rotation axis of the rotary working surface and rotationally drives the rotary working surface, a cylindrical housing that houses the driving mechanism, and a movable handle that is mounted on a surface of a cylindrical part of the cylindrical housing. The movable handle can be turned around a central axis of the cylindrical housing and can be fixed at an arbitrary position in a circumferential direction of the cylindrical housing.

Abstract: A semiconductor switch circuit is provided that enables current consumption to be reduced even in a conduction state. A semiconductor switch circuit 100 has P-type MOS transistors Q101 and Q102 for conduction that share a source and are connected in series between an input/output terminal 101 and input/output terminal 102, a P-type MOS transistor Q103 and N-type MOS transistor Q105 having drains connected to the gate of Q101, a P-type MOS transistor Q104 and N-type MOS transistor Q106 having drains connected to the gate of Q102, and a control terminal 103 connected to the gates of the transistors. Further semiconductor switch circuit 100 is configured with the sources and back gates of Q103 and Q104 connected to the sources of Q101 and Q102. Therefore, it is possible to switch the path between input/output terminal 101 and input/output terminal 102 between a conduction state and non-conduction state by means of voltage control by voltage value Vcont of a control signal applied to control terminal 103.

Abstract: The invention provides a split-type sliding bearing for a crankshaft in an internal combustion engine. The split-type bearing housing has a housing half having a higher thermal expansion coefficient, and a housing half having a lower thermal expansion coefficient. The pair of semi-cylindrical bearings includes first and second semi-cylindrical bearings. The first semi-cylindrical bearing is supported on the housing half having a higher thermal expansion coefficient, and a second semi-cylindrical bearing is supported on the housing half having a lower thermal expansion coefficient. The first and second semi-cylindrical bearings have the following dimensional relationship in a preinstalled condition: (a) the first and second semi-cylindrical bearings have an equal outer diameter, and (b) the first semi-cylindrical bearing has circumferential ends having a thickness smaller than that of the opposite circumferential ends of the second semi-cylindrical bearing.

Abstract: A semiconductor switch circuit is provided that enables current consumption to be reduced even in a conduction state. A semiconductor switch circuit 100 has P-type MOS transistors Q101 and Q102 for conduction that share a source and are connected in series between an input/output terminal 101 and input/output terminal 102, a P-type MOS transistor Q103 and N-type MOS transistor Q105 having drains connected to the gate of Q101, a P-type MOS transistor Q104 and N-type MOS transistor Q106 having drains connected to the gate of Q102, and a control terminal 103 connected to the gates of the transistors. Further semiconductor switch circuit 100 is configured with the sources and back gates of Q103 and Q104 connected to the sources of Q101 and Q102. Therefore, it is possible to switch the path between input/output terminal 101 and input/output terminal 102 between a conduction state and non-conduction state by means of voltage control by voltage value Vcont of a control signal applied to control terminal 103.

Abstract: Disclosed is a sliding bearing consisting of a pair of semi-cylindrical bearings assembled with each other so as to form a cylindrical configuration. At least one of the semi-cylindrical bearings is provided with a circumferentially extending oil groove on an inner surface thereof. The oil groove includes a central portion of a circumferential length of the semi-cylindrical bearing. A bottom surface of the oil groove has an ups and downs form consisting of a plurality of ridges and a plurality of roots, which undulate consecutively without a flat portion. The dimensional relationship between an optional ridge out of the plurality of ridges and the roots positioned adjacent to the optional root is defined by the formula h<0.15H where H indicates a groove depth defined by the inner surface of the semi-cylindrical bearing, namely a bearing sliding surface, and a depth of the roots, and h indicates an elevation difference of the ups and downs of the bottom surface, namely a height of the ridges.