A polished rod sealing device for an oil pumping machine includes a built-in stuffing box. The built-in stuffing box is arranged inside oil pipe enlargement press cap and can seal the polished rod of the oil pumping machine. The sealing device maintains dynamic coaxiality between the polished rod and the stuffing box, and reduces eccentric wear of the sealing packing resulted from the polished rod. The sealing device also provides lubrication between the polished rod and the sealing packing.

Aspects of the disclosure are directed to a shaft of an engine of an aircraft, an oil scoop coupled to the shaft, a first portion of a sensor integrated with the oil scoop, and a second portion of the sensor coupled to a structure of the engine. In some embodiments, the first portion of the sensor comprises at least one tooth.

An assembly including a channel track for engagement with the surface of a desk, having a generally flat bottom surface, a hollow interior portion and a slot extending the entire length of the channel track; at least two hubs, having a coupling with a bushing for receiving an office accessory; at least two plate nuts disposed in the hollow interior portion of the channel track, and wherein each hub is secured to a corresponding plate nut by a bolt which extends through the hub, through the slot in the channel track and into engagement with the corresponding plate nut; wherein when the plate nuts and hubs are loosely connected, the plate nuts and hubs are free to slide in the slot in the direction of the length of the channel track and when the plate nuts and hubs are tightly connected, the plate nuts and hubs are retained in their position in the slot without any sliding movement; and either a bolt or clamp member for securing the channel track to the desk.

A lubricator for a plunger lift system includes a tubular body, a shift rod housing, a first spring, and a second spring. The shift rod housing disposed in the tubular body and has a chamber. The shift rod has a first portion slidably disposed in the chamber and a second portion projecting from a first end of the shift rod housing. A distal end of the second portion of the shift rod is engageable with a shift valve of a bypass plunger. The first spring disposed in the chamber to absorb an impact force applied to the shift rod by the shift valve. The second spring disposed in the tubular body between a portion of the shift rod housing and a portion of the tubular body to absorb an impact force applied to the shift rod housing by a plunger body of the bypass plunger.

A lubricant pump (14) and a method thereof are disclosed. The lubricant pump (14) includes a pump base (32) and a reservoir housing (30). The pump base (32) and the reservoir housing (30) define a lubricant reservoir for storing lubricant. One or more pump elements (34) extend at least partially into the lubricant reservoir. Heaters (36) are disposed on the pump base (32) proximate the pump elements (34). The heaters (36) are configured to heat the local area surrounding the pump elements (34), to thereby reduce the viscosity of the lubricant at the pump elements (34). The heaters (36) are electrically connected to a thermal switch (38) to control activation and deactivation of the heaters (36). With the lubricant pump (14) and the method thereof, the thermal switch (38) can control the heater (36) based on air temperature rather than the temperature of the lubricant, so the viscosity of lubricant is well controlled.

An accumulator includes a tank body having a communication port that communicates the lubricant accommodating space capable of accommodating lubricant with the outside, the tank body extending around an axis, a piston that moves in the axial direction in the tank body to vary the size of the lubricant accommodating space, a spiral spring mechanism having a spiral spring, and a rotational force transmission member that converts a linear movement of the piston into a rotational force around the axis to transmit the converted rotational force. The rotational force transmission member converts a rotational movement due to a restoring force of the spiral spring into a force in the axial direction to move the piston in the axial direction.

A self-lubricating connector with a housing having a contact receiving cavity with a contact provided therein. A lubricating device is positioned in the housing proximate the contact. The lubricating device extends into the contact receiving cavity and has lubricant provided therein. The lubricant from the lubricating device is deposited or on the outside surface of the contact as the contact is moved between the first position and the second position, reducing wear on the contacts as the contacts are moved between the first position and the second position.

A self-lubricating connector with a housing having a contact receiving cavity with a contact provided therein. A lubricating device is positioned in the housing proximate the contact. The lubricating device extends into the contact receiving cavity and has lubricant provided therein. The lubricant from the lubricating device is deposited or on the outside surface of the contact as the contact is moved between the first position and the second position, reducing wear on the contacts as the contacts are moved between the first position and the second position.

A lubricator for a plunger lift system includes a tubular body, a shift rod housing, a first spring, and a second spring. The tubular body has a sidewall and a closed end. The shift rod housing is disposed in the tubular body and has a chamber, a first end, and a second end. The shift rod has a first portion which is slidably disposed in the chamber of the shift rod housing and a second portion projecting from the first end of the shift rod housing. A distal end of the second portion of the shift rod is engageable with a shift valve of a bypass plunger. The first spring is disposed in the chamber of the shift rod housing in a way to absorb an impact force applied to the shift rod by the shift valve of the bypass plunger. The second spring is disposed in the tubular body between a portion of the shift rod housing and a portion of the tubular body in a way to absorb an impact force applied to the shift rod housing by a plunger body of the bypass plunger.

A polished rod sealing device for an oil pumping machine includes a built-in stuffing box. The built-in stuffing box is arranged inside oil pipe enlargement press cap and can seal the polished rod of the oil pumping machine. The sealing device maintains dynamic coaxiality between the polished rod and the stuffing box, and reduces eccentric wear of the sealing packing resulted from the polished rod. The sealing device also provides lubrication between the polished rod and the sealing packing.