Disclosed is an opening and closing device including a closing member which is turned to an opening position by inserting a fuel-filling nozzle to open a fuel-filling aperture. The closing member includes a pair of flap bodies and a biasing device which positions each of the flap bodies in a closing position by a biasing force. The pair of flap bodies each includes a turning assembly portion as the center of the turning and an abutment portion with respect to the other flap body and is each configured to press its front surface portion against a hole edge portion of a passage hole of the fuel-filling nozzle by the biasing force and presses the abutment portion against the abutment portion of the other flap body.

A drain bolt configured to be forcibly withdrawn from an oil tank. The drain bolt includes a fastening screw section integrally formed on one side of a head and an elastic screw section coupled to the distal end of the fastening screw section. The elastic screw section formed of a soft material has extension threads continuous to threads of the fastening screw section. The color of the elastic screw section is distinguishable from the color of the fastening screw section. The elastic screw section can be separated from a female thread portion of the oil tank due to force applied by a user or a mechanic. Even when the fastening screw section is separated from the female thread portion of the oil tank, the sealing ability between the drain bolt and the female thread portion is maintained due to the elastic screw section remaining in the meshed position.

Disclosed is a structure for attachment of a drain nut to a synthetic resin cover. The cover has a nut engagement portion formed in an outer surface of the cover, a cylindrical engagement portion formed with a plurality of piece parts on an inner surface of the cover, and a stepped portion formed between the nut and cylindrical engagement portions. The drain nut has a nut portion engaged in the nut engagement portion, a female thread portion formed in the nut portion for screw-in of a drain plug, a cylindrical portion formed concentrically with the nut portion and engaged in the cylindrical engagement portion, a large-diameter portion formed between the nut and cylindrical portions and engaged in the stepped portion, with an O-ring held between the large-diameter portion and stepped portion, and a collar portion formed around the cylindrical portion and retained by front ends of the piece parts.

A magnetic drain plug includes a plug body that has a head section and a screw section protruding from the head section. The screw section is includes external threads for threading into a drain hole of a device containing lubricating fluid. The plug body has an axial bore for receiving a removable magnet through the head section. The axial bore has an axial depth such that a bottom of the axial bore extends into the screw section.

A diesel engine generator set comprising an electric generator, an internal combustion engine having an internal sump for collecting oil, and an oil reservoir external of the engine. The engine includes an oil inlet port opening into the internal sump, and connected to an outlet of the oil reservoir, and an oil outlet port connected to an inlet of the oil reservoir, such that a flow circuit is defined between the internal sump and the oil reservoir. The flow circuit comprises flow control means for selective control of oil flow between the internal sump and oil reservoir, such as one or more valve and/or pump. A controller may control flow between the internal sump and the external oil reservoir.

A drain plug includes a main body which has an entirely threaded region and a partially threaded region. An outer circumferential surface of the main body has an external thread, and at least one cutout. Thus, the entirely threaded region is formed on a base end side of the main body. The cutout includes a first part extending from the leading end of the main body in the axial direction of the main body, and a second part extending from the first part in a direction toward the base end of the main body. The second part has an inclined surface, and the inclined surface is connected to the entirely threaded region.

An assembly for draining fluid from a sump having a receiver. A plug is adapted for threaded engagement with the receiver, has a transverse outlet arranged for communication with the sump, and is rotatable between: sealed, where flow is inhibited across the outlet; and drain, where fluid from the sump flows across the outlet. A head is rotatably attached to the plug. A limiter between the head and plug operates in: lock, where the head and plug rotate concurrently in a first direction to move the plug from sealed to drain; slip, where the head rotates in a second direction independent of the plug in response to torque acting on the head exceeding a threshold; and limit, where the head and plug rotate concurrently in the second direction in response to torque acting on the head being less than the threshold to move the plug towards sealed.

A drain valve that includes a body having an upper opening. The drain valve further includes a valve located in the body having a valve opening that is alignable with the upper opening when the valve is in an open state. The valve is configured to release oil that enters the valve through the upper opening when the valve is in an open state. The valve is rotatable about the body in a first rotational direction to move the valve from the open state to a closed state. The valve is rotatable about the body in a second rotational direction opposite from the first rotational direction to move the valve from the closed state to the open state. A method of draining fluid from a system.

The invention relates to a plug (10) of the type used in threaded openings (AB) of oil pans (CT) of various vehicles. The plug (10) is made in a single piece (20), preferably of iron or other suitable material, the plug (10) having a six-sided head (21). An NPT threaded portion (23) in the shape of a truncated cone extends from the flat face (22) of the six-headed head (21) and has a base (23A) with an increased diameter (d1), the threaded portion extending along the axis (E1) with a slight taper such that the end portion (23B) has a reduced diameter (d2). The slight angle (#) formed by the threaded portion (23) provides gradual sealing points (PV) for punctually sealing damaged threaded openings (AB) of various oil pans (CT), thus preventing leakage of lubricant oil.

A drain bolt configured to be forcibly withdrawn from an oil tank. The drain bolt includes a fastening screw section integrally formed on one side of a head and an elastic screw section coupled to the distal end of the fastening screw section. The elastic screw section formed of a soft material has extension threads continuous to threads of the fastening screw section. The color of the elastic screw section is distinguishable from the color of the fastening screw section. The elastic screw section can be separated from a female thread portion of the oil tank due to force applied by a user or a mechanic. Even when the fastening screw section is separated from the female thread portion of the oil tank, the sealing ability between the drain bolt and the female thread portion is maintained due to the elastic screw section remaining in the meshed position.