摘要:
A sprag is disclosed. The sprag is configured to operate in a first mode allowing substantially mutual rotation of inner and outer races about an axis and a second mode allowing relative rotation between the inner and outer races. The sprag includes at least one actuator configured to selectively extend and retract and an outer surface configured to selectively lock the inner and outer races together as a function of the at least one actuator selectively extending.
摘要:
The present invention provides a novel one-piece capstan for a tape cartridge which provides good static dissipative properties and wear resistance. The capstan material of the present invention has a charge decay time of no more than 5 seconds as measured according to Mil B-81705C standard. The capstan material also has a flexural modulus of at least 200,000 psi (1379 MPa). The capstan comprises a hard, dimensionally stable polymer and a static dissipating polymer. The capstan also has an improved structure and geometry which enables the part to be easily molded, reduces drive force requirements with a reduction of material from the prior art design, but with no significant loss of performance properties.
摘要:
A braking apparatus includes a brake cylinder having a first opening and a second opening defined therein. The braking apparatus also includes a movable member located within the brake cylinder which has a channel defined therein. The braking apparatus further includes a brake chamber in fluid communication with the brake cylinder. The brake chamber has a brake member located therein. The movable member is moved to a position which allows fluid communication between the first and second opening through the channel thus creating a subsequent pressure drop in the system. The pressure drop causes a hydrostatic transmission in fluid communication with the brake apparatus to be neutralized by a responsive displacement of a pump and motor which reduces the travel speed of a vehicle. Additionally, the movement of the movable member causes a brake member to be forced against a moving object.
摘要:
An active pitch control is provided for counteracting the pitching motion of a mobile machine. The machine has an apparatus for transmitting driving torque from an engine to a pair of pneumatic tires. The pitch control includes a device for detecting a pitching motion of the machine and responsively outputting a control signal. A device receives the control signal and changes the driving torque transmitted to the tires to counteract the pitching motion.
摘要:
A corner belt guide roller for use in a belt driven tape cartridge is disclosed. The roller controls drag on the driving belt to maintain magnetic tape tension and reduce variability in the cartridge operation. The guide roller is mounted on a pivot pin through an inner cylindrical surface. The inner cylindrical surface has an oriented controlled texture including axial splines. This enables the guide roller to have controlled friction with its pivot pin, and provide a predetermined constant amount of drag to the driving belt to improve the consistency of the tape cartridge operation.
摘要:
Quick drop valves are usable in hydraulic circuits in which fluid is expelled from a hydraulic cylinder due to gravity force acting on a load connected to the hydraulic cylinder. The present quick drop valve has a sleeve carried by a valve member for establishing an orifice through which the fluid expelled from the hydraulic cylinder passes. When the flow rate of the expelled fluid exceeds a predetermined flow rate, a differential pressure generated by the orifice causes the valve member to start moving toward a quick drop position. In so doing, the sleeve quickly establishes a more restrictive orifice to immediately generate a higher differential pressure to cause the valve member to quickly move to the quick drop position. The more restrictive orifice also causes a greater amount of the expelled fluid to be returned by the valve member to the expanding ends of the hydraulic cylinders, yet still allows sufficient flow therethrough so that the quick drop action can be stopped if so desired. The sleeve also functions similar to a check valve and moves to a position permitting substantially unrestricted fluid flow through the quick drop valve when the fluid is being directed to the hydraulic cylinder to raise the load. An actuating chamber is defined in the valve member and is subjected to pressurized fluid generated in the circuit to hold the valve member in a blocking position when the blade is forced into the ground.
摘要:
In a tape which is driven by an elastic pretensioned belt, discontinuities such as embossings in the surface of the belt promote the release of air from between the belt and the underlying tape, thus minimizing variations in tape tension and tape speed.
摘要:
An embodiment of a method for detecting an anomaly in at least a portion of a wireline cable, comprises providing at least one wireline cable, providing a wireline surface equipment system comprising an anomaly detection system and disposing the anomaly detection system adjacent the wireline cable, operating the surface equipment to enable the wireline cable to pass by the anomaly detection system, operating the anomaly detection system to detect the presence of an anomaly in at least a portion of the wireline cable, the anomaly detection system generating an output when an anomaly is detected, and sending the output of the anomaly detection system to a control unit.
摘要:
A technique enables extending the useful life of tubing deployed in a wellbore. The technique involves routing a damaged or distorted tubing through a straightening device. The tubing straightening device bends and counter bends the tubing along predetermined axes as it passes through the tubing straightening device. The bending and counter bending are selected so the tubing exits the straightening device with a predetermined form.
摘要:
A sprag is disclosed. The sprag is configured to operate in a first mode allowing substantially mutual rotation of inner and outer races about an axis and a second mode allowing relative rotation between the inner and outer races. The sprag includes at least one actuator configured to selectively extend and retract and an outer surface configured to selectively lock the inner and outer races together as a function of the at least one actuator selectively extending.