7265 results about "Heavy load" patented technology

The ability of an ultrasonic system to sweep and lock onto a resonance frequency of a blade subjected to a heavy load at startup is improved by applying a high drive voltage or a high drive current while systematically increasing the level of the applied signal. Increasing the drive signal to the hand piece results in an improved and more pronounced “impedance spectrum.” That is, under load, the increased drive signal causes the maximum phase margin to become higher and the minimum/maximum impedance magnitude to become more pronounced. Increasing the excitation drive signal to the hand piece/blade at startup significantly alleviates the limiting factors associated with ultrasonic generators, which results in an increase of the maximum load capability at startup.

A support structure for supporting a processing target object includes a support main body that supports a weight of the processing target object and recess-shaped supporting body accommodating portions formed on a top surface of the support main body. The support structure further includes supporting bodies accommodated in the respective supporting body accommodating portions to be protruded above the top surface of the support main body. The supporting bodies are rollable in the respective supporting body accommodating portions while supporting the processing target object of which bottom surface is in contact with upper peak portions of the supporting bodies.

The MULTIBODY AIRCRANE performs relative positioning, predictive control, and ballast control to achieve very heavy-lifting tasks on land or sea. Such tasks allow station keeping and precise transfer of very heavy payloads between ships underway. This scalable multibody system features three subcomponents: AIRSHIP, SKYCRANE and LOADFRAME. This semi-autonomous system combines aerodynamic (kinetic) and aerostatic (buoyancy force) lift with efficient power and propulsion. During low-speed flight, the Airship and Skycrane are decoupled but linked via a reelable Tether Control Line. Beneath the Skycrane, centered on its hull, a patented NIST (National Institute of Standards and Technology) RoboCrane (featuring a computer controlled six degrees of freedom (DoF) cabling system,) is attached, to precisely suspend and control a Loadframe, with or without payload. During subsonic forward flight, these Airship and Skycrane are coupled as a single airframe (fuselage and delta wing.)

The throttle of an engine in an engine driven generator system operating under an intermittently heavy load, as in supplying current to a welder, is controlled such that successive control signals sent to a throttle actuator for adjusting the engine throttle position are inhibited until at least a predetermined time has elapsed since the last preceding adjustment to the throttle. This procedure ensures that, as to each incremental adjustment to the throttle, the engine has sufficient time to respond, thereby preventing over-speeding or stalling the engine. The throttle actuator may be a stepper motor which is stepped by throttle position change signals from a processor which monitors engine speed and generator load to determine whether the throttle should be adjusted and, if so, in which direct. Alternatively, the throttle actuator may be a solenoid pulling against a spring in accordance with the average current through the solenoid coil. In this embodiment, the processor causes pulse width modulated signals to be applied across the solenoid coil with throttle position changes being reflected in changes to the width of the pulses, such changes in the pulse width being delayed for at least the predetermined time since the last preceding adjustment to the throttle.

The present invention discloses a forward-flyback converter with active-clamp circuit. The secondary side of the proposed converter is of center-tapped configuration to integrate a forward circuit and a flyback circuit. The flyback sub-circuit operating continuous conduction mode is employed to directly transfer the reset energy of the transformer to the output load. The forward sub-circuit operating discontinuous conduction mode can correspondingly adjust the duty ratio with the output load change. Under the heavy load condition, the mechanism of active-clamp flyback sub-circuit can provide sufficient resonant current to facilitate the parasitic capacitance of the switches to be discharged to zero. Under the light load condition, the time interval in which the resonant current turns from negative into positive is prolonged to ensure zero voltage switching function. Meanwhile, the flyback sub-circuit wherein the rectifier diode is reverse biased is inactive in order to further reduce the power losses.

A flow responsive dump valve mechanism for a straddle packer tool and has a valve controlled flow passage from which underflushed fluid, typically well treatment slurry, in a conveyance and fluid supplying tubing string can be dumped into a well casing. The dump valve mechanism incorporates a ratcheting power piston, an indexing mechanism and high and low load energy storage systems to accomplish open, closed and intermediate dump valve positions. The intermediate position increases the functionality of the tool by preventing accidental closure either due to the free fall of fluid through the coiled tubing or during flushing of the tool and permits the flow rate to be increased for thorough cleaning of the straddle tool and coiled tubing. For energy storage, a light compression spring provides power to cycle the indexing mechanism. Heavier load disc springs (Bellville Washers) are used to provide power for the ratcheting power piston to open the valve.

By providing a plurality of cooperating, foldable panel members in combination with a plurality of foldable wheel assemblies, a unique wagon or cart construction is attained which is capable of being folded into a small, compact area, whenever desired, and then quickly and easily deployed into a fully erected and operational position, which enables virtually any desired object to be easily transported. In addition, in the preferred construction of this invention, an automatically deployed structural supporting member is incorporated into the wagon/cart for providing inherent strength and rigidity to the wagon/cart when fully erected. In this way, heavy objects previously incapable of being transported are capable of being accommodated with ease.

A server is capable of receiving large numbers of concurrent download requests, establishing TCP sessions with each client. A copy of the socket of each session, together with descriptor information of the file requested are transferred to a download manager, and the original connection immediately closed. The connection to the client remains open via the copy of the socket, which is then converted to a non-blocking socket by the download manager converts to copy of the socket to a non-blocking socket, and downloads the requested information to the client using the non-blocking socket and its own connection to the server. The arrangement is capable of dealing with loads that would ordinarily overwhelm the server's capability of establishing and maintaining individual TCP sessions with its clients. Heavy loads, including bursty peak loads, are handled gracefully, without causing the server to stall, or to refuse connections.

A dual-mode pulse frequency modulation boost converter operates in a hysteretic mode during light load currents to regulate an output voltage using a substantially fixed peak switching current and operates in a continuous mode during heavy load currents to regulate the output voltage using a variable peak switching current. The boost converter senses load power to automatically switch between the hysteretic mode and the continuous mode.

The present invention relates to the preparation of rubber compositions for tire tread and tire sidewall component applications. A tire is provided having tread of such composition designed for relatively heavy loads such as, for example, truck tires. A tire having a sidewall of such composition is also provided. Such tire component rubber compositions are of rubber compositions reinforced with precipitated silica and selected carbon black in specified amounts and prepared with a prescribed order of addition to the rubber composition and composed of elastomers as a specific combination of natural or synthetic cis 1,4-polyisoprene rubber together with cis 1,4-polybutadiene rubber or with a combination of cis 1,4-polybutadiene rubber and trans 1,4-polybutadiene rubber.

The invention discloses a method for handling an address resolution protocol (ARP) packet, and access equipment and a communication system thereof. The method comprises the following steps: access equipment receives an ARP packet through a lower interface, which carries an active Internet protocol (IP) address, a source media access control (MAC) address, a destination IP address and a destination MAC address; the access equipment judges whether the source IP address is the same as the IP address of gateway equipment configured on the lower interface, and the upper interface of the access equipment is connected with the gateway equipment; if the source IP address is the same as the IP address of gateway equipment, the access equipment discards the ARP packet; and if the source IP address is different from the IP address of gateway equipment, the access equipment forwards the ARP packet according to the destination IP address in the ARP packet. The embodiment of the invention can prevent the ARP packet which is deceived by an illegal host and passes through the gateway equipment of not performing ARP spoofing with respect to the gateway equipment, without imposing heavier load upon the gateway equipment.

The present invention provides a high speed and low power consumption LSI operable in a wide temperature range in which a MOS transistor having back gates is used specifically according to operating characteristics of a circuit. In the LSI, an FD-SOI structure having an embedded oxide film layer is used and a lower semiconductor region of the embedded oxide film layer is used as a back gate. A voltage for back gates in the logic circuits having a small load in the logic circuit block is controlled in response to activation of the block from outside of the block. Transistors, in which the gate and the back gate are connected to each other, are used for the circuit generating the back gate driving signal, and logic circuits having a heavy load such as circuit block output section, and the back gates are directly controlled according to the gate input signal.

The invention discloses a multi-degree-of-freedom controllable mechanism type stacking robot, which comprises a pedestal, a rotary rack, an arm lifting mechanism, an end effector translation retaining mechanism and a flange, wherein the rotary rack is connected to the pedestal through a rotary pair; the arm lifting mechanism comprises a large arm, a small arm, a first driving rod, a first connecting rod, a second driving rod and a second connecting rod; all the rods are connected through hinges; the end effector translation retaining mechanism comprises a parallelogram mechanism consisting of the large arm, a first auxiliary connecting rod, a triangular auxiliary rack and the rotary rack and a parallelogram mechanism consisting of the small arm, a second auxiliary connecting rod, a triangular auxiliary rack and an end effector translation retainer; all the rods are connected through hinges; the flange is connected to the end effector translation retainer through the rotary pair; and different end effectors can be arranged according to actual requirements. The multi-degree-of-freedom controllable mechanism type stacking robot has the advantages of simple structure, high bearing capacity, large working space, flexibility in operation, capabilities of driving through a servo motor for control, realizing intelligence and digital control and meeting handling and stacking requirements of high speed, heavy load, precision and the like and extremely broad application prospect.

A dual-mode pulse frequency modulation boost converter operates in a hysteretic mode during light load currents to regulate an output voltage using a substantially fixed peak switching current and operates in a continuous mode during heavy load currents to regulate the output voltage using a variable peak switching current. The boost converter senses load power to automatically switch between the hysteretic mode and the continuous mode.

A collapsible and portable cart for universal use in a wide variety of residential and commercial environments, transporting different and various items, while shopping, gardening, laundry, transporting boxes or luggage, etc. The cart has base portion with wheels, which enable to move over the ground and a first foldable basket for heavy loads; and the rapper portion, that has a second foldable basket. Base portion is pivotally connected to the upper portion by link arms and secured by locking mechanisms. Both baskets have locking mechanism to keep the foldable screens in an upright position. The portable universal cart includes a receptacle with compartments, having different devices, to make the use of the cart more pleasing, safe and with more comfort for the user. The portable universal cart has different configurations according the user's need.

The invention relates to a control scheme of double-module operation of a direct current switching power supply, which is used for direct current voltage stabilization and improves the efficiency whenthe power supply is in underloading. Under heavier load, a system adopts a pulse width modulation (PWM) mode. When in underloading, the system automatically enters a pulse frequency modulation (PFM)mode, and outputs stable direct current voltage according to detected current and load voltage by corresponding logic. Under the PFM mode, equivalent switching frequency of the power supply is loweredfollowing the reduction of the load, and the switching loss is reduced, thereby improving the efficiency when in underloading. When the load is jumped, the system automatically performs the smooth transition between the PFM mode and the PWM mode and ensures the rapid dynamic response of the output voltage. Under the PWM mode, the system integrates feedforward control of the input voltage and increases the capacity of resisting the jump of the input voltage by the load voltage. The invention is suitable to power supply control of a portable media player, an intelligent mobile phone, a load point power supply and the like.

A resonance converter and a synchronous rectification driving method thereof are provided. The resonance converter includes a switch circuit having at least two first switches, a resonance circuit having a resonance frequency, a transformer, and a full-wave rectification circuit having two second switches each of which has a drain and a source and generates a channel resistance voltage when a current flows through the drain and the source. The synchronous rectification driving method includes steps as follow. When an operating frequency of the resonance converter is less than the resonance frequency and the resonance converter is coupled to a heavy load, the channel resistance voltage is compared with a reference voltage for driving the second switches of the full-wave rectification circuit; and when the operating frequency of the resonance converter is not smaller than the resonance frequency, duplicated signals of signals used to drive the first switches are respectively used to drive the second switches of the full-wave rectification circuit.

The invention provides a control method of a flyback converter. The control method is a control method in a mixed control mode; in other words, the flyback converter works in a non-complementation state under light loads, the clamp switch pipe on time is shortened through down conversion, and light load losses are effectively reduced through down conversion; flyback converter works in a fixed-frequency drive complementation state under heavy loads, and the clamp switch pipe on time is prolonged. Compared with the prior art, the control method has the advantages that the voltage stress of a main switch pipe and a clamp capacitor can be effectively reduced, the main switch pipe off losses can be reduced, the clamp circuit current change slope is decreased, the EMI interference is reduced, the secondary current change slope is decreased, and the longer detection reaction time is provided for synchronous rectification. Meanwhile, the working area of a magnetic core in the third quadrant is enlarged, the maximum flux density is reduced, and the size of the magnetic core is reduced.

A fully enclosed carton for carrying heavy loads with a reinforcement insert for the handle apertures located in the top end flaps of the carton. The paperboard reinforcing insert may be extended as a bridge across the top panel of the carton to prevent tearing of the handle apertures in the top end flaps and also tearing in the top panel of the carton when carrying a heavy load. The carton may have one or more dispensers in the top panel which may extend into an adjoining side panel. Multiple tear lines may be formed for the dispenser flap in the insert that extends across the top panel to permit easy access to the containers, such as bottles, in the carton. The paperboard reinforcing insert may have a larger aperture than the handle aperture in each top end flap to adjust for any imprecision in the alignment of the paperboard insert in forming the carton sleeve from the paperboard blank. When the paperboard insert extends across the top panel and one or more dispensers are formed in the top panel, multiple tear lines may be used to form the flaps in the insert to compensate for any imprecision in the insertion of the insert that extends across the top panel into the carton sleeve when it is being formed.