54results about How to "Shorten stroke length" patented technology

A pump jack system for reciprocating a pump rod string is made up of a base frame and piston drive cylinders mounted on the base frame with the upper end of the pump rod connected to the cylinder assemblies, the cylinder assemblies being operated in unison by a fluid control circuit communicating with inner and outer concentric fluid passages, and the pump rod string is counterbalanced by a fluid circuit which supplies pressure in an upward direction to each of the pistons on each upstroke and substantially reduces the pressure on each downstroke, the fluid circuit being selected from an inert gas alone or an inert gas pressurizing a hydraulic fluid. The fluid control circuit includes a directional control valve and timer, along with a fluid dampener, which is automatically responsive to dampen pressure surges and acceleration shocks at the beginning of each upstroke and downstroke.

A guide-rail brake (1) of an elevator and method for controlling the brake, which brake comprises a frame part fixed to the elevator car, and a prong part, which contains turning jaws (3,4) that correspond to the guide rail (2) via the braking surfaces when braking, a spring (10) loading the prong part to press the braking surfaces to the guide rail, a controllable mover, which is an electromagnet (15) , which electromagnet (15) contains two pulling core pieces (17,18) , the force effect of which electromagnet (15) on the prong part is opposed to the spring. In the guide-rail brake an air gap(ag) is structurally arranged between the center parts (19,20) of the pulling core pieces (17, 18) of the electromagnet of the guide-rail brake when the brake is fully energized, and a damping circuit is arranged in the coil (16) of the electromagnet (15) of the guide-rail brake to speed up operation of the guide-rail brake.

A Stirling engine (1) includes a reciprocating piston which drives an alternator to provide an electrical output (7). The current signal (7) is measured by a current monitor (60) and a fast Fourier Transform value is produced. The FFT of the current signal (7) has been found to be directly related to the stability of operation of the Stirling engine. As harmonic peaks in the FFT increase, this indicates that the stroke length of the piston is approaching or exceeding a safe maximum. Correction action, such as a reduction in heat to the Stirling engine, can be taken in consequence. A variety of stroke length detectors (110) are also disclosed, for use in combination with, or separately from, the FFT analysis of the current signal (7). Optical and mechanical switches and analogue sensors are disclosed, along with an accelerometer mounted upon the casing of the Stirling engine.

The device is a counterbalance system and method to reduce the work of conventionally balanced, reciprocating cantilevered beam pumping units, and comprises a pair of transversely oriented support mounts attached to the cantilevered beam or walking beam of a pre-existing reciprocating pumping unit, attaching on either side of the pivoting-fulcrum, mounting point of the cantilevered walking beam. These transverse mounting points terminate individually on either side of said walking beam in channel-like saddles that support independent, parallel beams, which in turn cantilever themselves in tandem with said walking beam of the pumping unit; moreover, the position of the parallel beams by virtue of the transverse mounts creates a new center of gravity corresponding to the center of the pivoting mounting point of the walking beam, eliminating counter-productive torque forces on the walking beam as it tilts from horizontal.

A pump jack system for reciprocating a pump rod string is made up of a base frame and piston drive cylinders mounted on the base frame with the upper end of the pump rod connected to the cylinder assemblies, the cylinder assemblies being operated in unison by a fluid control circuit communicating with inner and outer concentric fluid passages, and the pump rod string is counterbalanced by a fluid circuit which supplies pressure in an upward direction to each of the pistons on each upstroke and substantially reduces the pressure on each downstroke, the fluid circuit being selected from an inert gas alone or an inert gas pressurizing a hydraulic fluid.

A hoist, for example, capable of use for raising and lowering a truck bed to and from a truck frame. In certain embodiments, a scissor-type hoist having a hydraulic cylinder pivot located to improve hoist lift efficiency (e.g., thereby exhibiting improved hoist lift capabilities).

The present invention relates to a way to adapt a wave transducer to the actual amplitude of incident waves, so as to improve the efficiency of energy conversion. The adaptation includes a variable-energy piston assembly and a tapered float.

The invention relates to a bearing dismounting device, in particular to a differential type bearing dismounting device. The differential type bearing dismounting device comprises a power shaft, a pre-tightening sleeve, an upper differential sleeve, a movable joint, a lower differential sleeve, a connecting plate, an arc-shaped clamping plate and pins, wherein the power shaft is in threaded connection with the pre-tightening sleeve, the upper differential sleeve and the lower differential sleeve respectively in threaded connection with the pre-tightening sleeve, the upper end of the connecting plate is connected with the upper differential sleeve through the pin, the middle is connected with the movable joint through the pin, and the lower end of the connecting plate is connected with the arc-shaped clamping plate through the pin. The differential type bearing dismounting device has the advantages that the device is simple in structure and convenient to use, the upper differential sleeve and the lower differential sleeve form differential, the stroke length of the device on the pre-tightening sleeve is decreased, and the size of a bearing dismounting tool is decreased; a thread is machined on the inner arc surface of the arc-shaped clamping plate, the friction force between the inner arc surface and the cylindrical surface of a bearing is increased, and the device facilitates dismounting; the defects of large size, complicated structure and inconvenient carrying of a common bearing dismounting tool are overcome, and the device has a certain practical value.

The invention refers to a pull cord arrangement for a roller blind or a venetian blind, comprising a winding element (4) arranged to be connected to a blind (6) such that the blind (6) is released or wound in response to a rotational movement of the winding element (4) about a rotational axis; a connecting element (28) coupled to the winding element (4) to rotate together with the winding element (4); and a pull cord (50) engaging the connecting element (28) so as to control the rotation of the connecting element (28) and thus the winding element (4) as the pull cord (50) is operated.