Abstract: A method and apparatus capable of suppressing fluctuation in shrinkage of a silica glass pipe such that an optical fiber preform uniform in the longitudinal direction can be produced are provided. In the step of depositing a glass layer in the silica glass pipe, at least the amount of the exhaust gas or buffering gas is feedback-controlled, and at least other one of them is pattern-controlled according to a flow rate pattern corresponding to heating positions on the silica glass pipe. The apparatus includes two or more in total of an exhaust portion and a buffering gas inlet portion, a heat source, a position detecting means for detecting a heating position, a first control means for controlling at least the amount of the exhaust gas or buffering gas according a flow rate pattern corresponding to heating positions, and second control means for feedback-controlling at least other one of them.

Abstract: A method of manufacturing mineral fibers includes rotating an orificed spinner and supplying molten mineral material to the spinner to centrifuge steams of molten mineral material. A downward annular flow of attenuating gases is directed to attenuate the streams of molten mineral material into mineral fibers. A mixture of combustion air and combustion gas is supplied to an annular burner positioned around the spinner. Heat from the annular burner is directed toward the spinner and the streams of molten mineral material to heat the spinner and assist in attenuating the streams of molten mineral material into mineral fibers. A pressure sensor senses the pressure of the combustion air prior to the introduction of the combustion air to the burner. The pressure of the combustion air is controlled in response to the sensed pressure to maintain the pressure of the combustion air at a specific pressure.

Abstract: A system component (1), such as, for example a knitting machine needle (2), intended for a loop-forming machine has in its foot (8) at least one cutout (14) that is set up to accommodate a section of a holder (17). This holder can be clipped into the cutout in order to hold several such system components in a pre-specified sequence and at a lateral distance and in alignment with respect to each other. The systems components, which are thus temporarily connected to each other, can be handled as a unit and, in this manner, can be removed from the bed (5), can be treated, for example be cleaned, and can be replaced in the same sequence and alignment in the bed (5).

Abstract: A tub of a washing machine that prevents vibration and noise and a method of manufacturing the tub are provided. The tub includes a rear tub portion, a front tub portion located in front of the rear tub portion, and one or more linear reinforcing portions formed on at least one of the rear and front tub portions and extending in a direction parallel to a central axis of the front and rear tub portions.

Abstract: An improved trailer theft-thwarting coupling dock to prevent unauthorized coupling and hauling of the trailer coupling dock includes a coupling dock body, a upper mechanism, a lower mechanism and a lock assembly. The upper mechanism has a upper handle fastening to the lock assembly. Through locking and unlocking of the lock assembly, unauthorized opening of the upper mechanism can be prevented. Thereby the trailer coupling dock cannot be coupled and hauled unless authorized, and an improved theft-thwarting effect can be achieved for the trailer.

Abstract: A double lock includes a first lock body including a key lock mechanism, a second lock body movably mounted on the first lock body and including a number lock mechanism, and an indicator movably mounted on the second lock body. The second lock body is lockable and unlockable by either one of the key lock mechanism and the number lock mechanism. When the number lock mechanism misses a correct code, the indicator is driven by the second lock body to an indication position, and when the number lock mechanism reaches the correct code, the indicator is driven by the second lock body to return to an original position. Thus, the double lock has an indication function without having to provide a shackle that is used in the conventional padlock.

Abstract: A burglarproof lock is a lock with a connecting section and is used on electronic devices. It is used to connect and lock with the connecting port of the electronic device. The burglarproof lock includes a housing, a lock apparatus, and at least one handling device. The housing has a connecting section, and it defines a cavity where the lock apparatus is mounted inside. The lock apparatus has an axially movable shaft. The handling device is movably disposed on one side of the housing and in contact with the shaft. The handling device is movable along with a block section. One end of the block section is extended to form a clasp on one side of the connecting section. When the lock apparatus is locked, the lock apparatus will control the shaft to be unmovable. On the other hand, when the lock apparatus is unlocked, the lock apparatus release the shaft to be axially movable.

Abstract: A latch has a displaceable latching element in a housing for engagement with a separate striker arm to be latched behind an engagement shoulder of the latching element. The housing mounts a cylinder lock to receive a key from the front: A rotor is mounted on the rear of cylinder lock and rotation of the key rotation the rotor to drive a locking element to engage and lock the latching element. The rotor may also be axial displaceable against spring biasing responsive to a rear unit pushing element whereby unlocking from a rear cylinder lock may rotate the rotor to unlock and pushing causes the latching element to be displaced against its biasing to release the striker arm.

Abstract: A gate latch is adapted to be installed on a gate post and a complementary striker arm is secured typically to a gate so that, upon closure of the gate, the striker arm engages a displaceable latching element mounted in a housing of the latch to displace the latching element. The latching element is biased towards its open position but when the striker arm engages with the latching element it is displaced, thereby releasing an interference portion of a biased locking element, whereby the locking element is released to move under its biasing into a locking position so that self-locking is provided for the latch. A rotary release mechanism may be actuated to return the locking element so that they latching element can be released to release the striker bar and the gate may be opened.

Abstract: Methods and systems for supporting and securing a wheel hub include a base and a support member. The support member includes a wheel hub cut-out configured to receive a portion of a wheel hub therethrough. The support member also includes a plurality of lug bolt cut-outs radially spaced around the circular wheel-hub cut-out. The lug bolt cut-outs are configured to receive lug bolts associated with the wheel hub. The wheel hub support system is optionally used in conjunction with a locking mechanism to secure the wheel hub support system to a wheel hub, and/or to secure the wheel hub support system to a stationary device. A locking device can include, for example, a locking lug nut. An optional lock protection mechanism protects the locking mechanism from physical force. An optional second support member assists in preventing the first support member from bending or collapsing under the weight of a supported vehicle.

Abstract: The description is directed to a snap fastening for fast mounting of fittings such as socket wrench latches, swivel lever latches, hinge parts in openings in a thin wall, comprising a head part which is to be arranged on one, outer side of the thin wall and which overlaps the outer rim of the opening, and a body part which proceeds from the head part and projects through the opening in the mounted position, and holding elements which project from the body part and are flexible in direction of its outer surface, the free end of these holding elements being provided with a first inclined surface (run-in bevel) such that the holding element is pushed back in a spring-loaded manner by the opening edge and with a second inclined surface (stop bevel) for supporting the body part without play on the rim or edge of the opening of the other, inner side of the thin wall, which second inclined surface is substantially perpendicular to the first inclined surface.

Abstract: A device and method to sort high security lock pins to characterize their length, wedge direction, and slot position comprises a lock pin decoding body containing lock pin cavities that receive high security lock pins and orient them in a uniform way by fitting a tab on the upper end of the lock pins in a notch, thereby revealing whether the lock pins have a slot positioned in the “left”, “center” or “right” positions, which can be read from indicia on the lock pin decoding body, and further revealing if the lock pins have a “fore” or “aft” facing wedge, which can also be read from indicia on the lock pin decoding body.

Abstract: An apparatus and method of producing compost tea with an elongated container having a vortex chamber, filter, and outlet wherein compost is placed inside the vortex chamber, nozzles spray water into the compost chamber under pressure forcing nutrients and micro-organisms from the compost into the water which passes through the filter and out the outlet into a holding tank. The filter retains compost solids in the vortex chamber. The water is re-circulated through the apparatus until desired composition is reached.

Abstract: A method of and a rolling mill stand for cold rolling of a metallic rolling stock (1), in particular rolling strip (1b) with nozzles for gaseous or liquid treatment media, with which the rolling stock (1) is displaced under a processing temperature through a roll gap (40) of a roll pair of upper working roll (2) and lower working roll (3) to undergo plastic deformation, and which permits in addition to a rolling stock surface improvement, the lubrication and surface protection of the rolling stock (1) and the rollers (2, 3) by a reduction in roll separating, with introduction of deep-chilled media, whereby deep chilled inert gas (41), ambient temperature inert gas (41a), lubricant emulsion (42), of admixed base oil, or oil-free, non-residue evaporating hydrocarbons are introduced against the sides (2a; 3a) of the working rollers (2, 3), and/or the rolling gap (40), and/or the rolling stock (1) in groups of jets from individual rows of nozzles (6a to 22b) for lubrication, cooling, and for inerting.

Abstract: An apparatus and method for the forming of corrugations in cylindrical objects or plain sheets, which include but no limited to two or more rotating spline or keyed shafts with internally grooved sliding wheels. Springs or collars with elastic properties are located between sliding wheels to allow them to keep predetermined distance which varies under axial forces.

Abstract: A sheet metal bending brake having a frame with a sheet metal support surface. A clamping jaw is movable relative to 'the frame support surface to clamp the sheet metal between the clamping jaw and the frame. The clamping jaw has a linear front edge. An elongated bending arm is pivotally mounted to the frame by an elongated flexible strap having spaced apart edges. One edge of the strap is secured to the bending arm while the other edge of the strap is secured to the frame such that the bending arm extends parallel to and closely adjacent the clamping jaw front edge.

Abstract: A method of producing a metal container from a low carbon steel strip or sheet coated on at least one of its surfaces with a coherent laminated coating of a thermoplastic polymer material includes one or more redrawing stages which reduce the thickness of the side walls by a drawing/stretching operation, and a partial reverse redrawing stage to produce an initial internal chamber whose depth is produced by a reduction of its height. The initial internal chamber is then redrawn to produce two chambers of differing diameter and depth, the diameter of the initial chamber being decreased by the redraw operation and inserting by base reforming the final chamber with a new internal diameter and depth produced by a reduction in the container height.

Abstract: A pressure relief device for venting an internally pressurized container such as an aerosol can has three sections, a concave annular outer area, a circular central area and an annular intermediate area connecting the concave annular area to the circular area. The three sections all have the same thickness. The central area has a center point and an arc shaped score line extending through 132° to 138°, preferably 135°, about an arc center. The arc center is offset from the center point of the circular area by a distance of from about 0.290 inches. The score line has a depth of from 0.010 to 0.012 inches and is trapezoidal in transverse cross section. The intermediate area meets the circular area at an angle greater than 90° and the intermediate area meets the concave annular outer area at an angle greater than 90°.

Abstract: A method for repairing metal pipe with dents includes steps of a) holding the pipe with first and second ends in position; b) dragging the mandrel through the pipe; and c) pushing out the dents from inside to an original level of the surface of the pipe. The cross-section of the mandrel has a substantially same cross-section of the hollow space of a undamaged pipe, and the outer surface of the major portion of the mandrel fits tightly to the inside of the undamaged pipe. The step of holding the pipe includes steps of a) guiding the pipe into a locking position; b) stopping the pipe along the direction of the axis of the pipe; and c) stopping the pipe along the perpendicular direction of the axis of the pipe.

Abstract: The invention relates to a method for producing hollow profiles provided with different cross sections along the length thereof. Said profiles are shaped in a die from one piece of cut metal sheet (5, 6, 7). According to said invention, a convex or concave rounding produced on the edges of a longitudinal section (8a, 8b, 9a, 9b) results in material excess or material shortage in the transition regions (8, 9), thereby preventing the material thinning or thickening in said transition regions (8, 9) during forming.

Abstract: Disclosed is a method for producing hollow elements (200), such as nut elements, which are to be mounted on parts generally made of sheet metal, particularly for producing hollow elements having an at least substantially square or rectangular outer contour (202). According to said method, individual elements are cut to size from a profiled member that is provided in the form of a profiled bar or a reel after punching holes into said profiled member, optionally followed by embodying a threaded cylinder (206) using a follow-on composite tool (10) with several workstations (A, B, C, D). The inventive method is characterized in that a penetrating process, a punching process, and a flattening process are carried out in the workstations (A, B, C, D). Also disclosed are hollow elements (200), assembly pieces, and a follow-on composite tool (10).

Abstract: An automobile body repair machine incorporating a quill and shaft load shouldering assembly whose quill includes lateral, medial, and oppositely lateral sections; slide stopping set screws extending through the quill sections for impingement upon the quill and shaft combination's shaft; weld seam grasping left and right anchor clamps fixedly attached to the lateral and oppositely lateral quill sections; a pull force transferring cantilevered stem; a selectively lockable and unlockable pivot joint interconnecting the stem and the medial quill section; a pivoting cantilevered foot attached to a distal end of the stem; and a foot extending hydraulic cylinder triangulating between the stem and the foot; the automobile body repairing machine further incorporating a body damage pulling tie attached to a distal end of the cantilevered foot.

Abstract: A punching machine is provided with a tool holder for a punching tool and a die having a cutting edge which can be passed by the punching tool in a machining stroke direction and a return stroke direction. The machine includes at least one work support, supported by at least one spring element. The work support is arranged in the region of the die, and the spring force of the spring element is adjustable.

Abstract: An electronics insert arrangement for a measuring device includes an electronics insert and an electronics module. The electronics insert includes a first attachment device and a first interface. The electronics module includes a second attachment device and a second interface. For coupling the electronics module to the electronics insert, the first attachment device and the second attachment device can be brought to engage each other such that a space between the first interface and the second interface remains essentially constant when the electronics insert moves. The electronics insert is equipped to carry out processes of a first functionality, and the electronics module is equipped to carry out processes of a second functionality.

Abstract: A temperature sensor includes a heat conducting metallic contact pad having a contact surface. A sensor probe is embedded in the contact pad. Conductive wires extend through the contact pad and are connected to the sensor probe.

Abstract: A gas sensor is disclosed including a sensor element, an element holder, an atmosphere-side insulator, an atmosphere-side cover, and a pressing member interposed between a shoulder portion of the atmosphere-side cover and a base end face of the atmosphere-side insulator. A heat-transfer restricting support member is associated with at least one of the shoulder portion of the atmosphere-side cover, the base end face of the atmosphere-side insulator and the pressing member to allow the pressing member to be held in contact with the shoulder portion of the atmosphere-side cover and the base end face of the atmosphere-side insulator in a minimum contact surface fore thereby restricting a heat transfer from a distal end of the gas sensor to a base end thereof.

Abstract: In a knock sensor signal processing apparatus, a first apparatus which receives an engine knock sensor signal performs A/D conversions of the signal with a predetermined period and transmits successive pluralities of A/D values in parallel, by serial data communication, to a second apparatus in response to respective commands received from the second apparatus. The number of communication lines provided for transmitting the A/D values is made greater than those for transmitting commands from the second apparatus to the first apparatus, so that a high A/D conversion frequency together with low data rate of transmitting the A/D values can be achieved, thereby reducing communication-generated noise.

Abstract: A method and apparatus for detecting contaminants in hydrocarbon fuel are disclosed, wherein a fuel analyzer includes a flow sensor to facilitate an automatic start up and shut down of a fuel analysis, and a calibration standard to facilitate an inline calibration of the fuel analyzer.

Abstract: A thermally insulated apparatus provides a substantially adiabatic environment for elevated temperature liquid chromatography applications. The thermally insulated apparatus minimizes or eliminates temperature gradients between columns and mobile phases, and maintains a temperature at or near the set point of an operably coupled heating means. The apparatus is also effective when used in conjunction with a liquid mobile phase heater such as those provided by an HPLC column compartment or a metal capillary of sufficient length to heat the liquid mobile phase.

Abstract: A device and method for measuring the consumption of fuel in an internal combustion engine system having fuel injectors, the device comprising a main body having two flow-measuring chambers with each chamber including a flow meter wherein one flow meter is located upstream the injectors and another flow meter is located downstream the injectors for calculating the difference between the flow upstream the injectors and downstream the injectors, and whereby the difference is fed to a data processing unit to calculate the real fuel consumption.

Abstract: In an apparatus for controlling an engine, an abnormality determining unit determines whether the crank signal is abnormal based on a state of a input signal for an interval measuring unit. The interval measuring unit measures a time interval from when a predetermined-directed level change appears in the input signal and a temporally next predetermined-directed level change appears therein. An input unit switches the input signal for the interval measuring unit from a crank signal to a cam signal when it is determined that the crank signal is abnormal. The crank signal has a level that repetitively changes in a predetermined direction each time the crankshaft rotates by a first angle. The cam signal has a level that repetitively changes in time in a predetermined direction each time the camshaft rotates at least by a second angle different from the first angle.

Abstract: An apparatus and method for determining at least one downhole formation property is disclosed. The apparatus includes a probe and a pretest piston positionable in fluid communication with the formation, and a series of flowlines pressure gauges, and valves configured to selectively draw into the apparatus for measurement of one of formation fluid and mud. The method includes performing a first pretest to determine an estimated formation parameter; using the first pretest to design a second pretest and generate refined formation parameters whereby formation properties may be estimated.

Abstract: A watertight fuel-gauge housing comprises a housing at least partially positioned in the interior of a fuel tank; a gauge mechanism within said housing for providing an indication of the level of fuel within said tank according to the position of a floating device connected to a shaft that penetrates the housing; and a sealing assembly for sealing the opening through which said shaft penetrates the housing, the sealing assembly comprising a rotatably movable sealing washer and a mounting packing tightly positioned within a seat formed around the opening of the housing through which said shaft projects.

Abstract: A wheel balancer for balancing a wheel having a rim and tire. The wheel balancer comprises a chassis and a driven shaft extending away from the chassis for rotating the wheel. An A&D arm, pivotal and axially extendible with respect to the chassis, is also provided. A first laser device is operable to produce a laser spot at a desired weight placement location on an inner surface of the rim. The first laser device is manipulable by an operator to move the laser spot to the desired weight placement location. A second laser device is attached to the A&D arm and movable therewith. The second laser device produces a visible marker on the inner surface of the rim for determining when the A&D arm is in a plane of the desired weight placement location.

Abstract: A detector is made up of a semiconductor integrated circuit in a part, and the semiconductor integrated circuit includes a driving circuit, an AC amplifier, a detection circuit and an amplifier circuit. An input resistor that is connected to input terminals of an operational amplifier includes an internal input resistor made up of a semiconductor integrated circuit element and an external input resistor made up of an external discrete component connected to each other in parallel. Temperature characteristics of an angular velocity sensor is compensated by a temperature coefficient (a3) that is a combination of a temperature coefficient (al) of the internal input resistor and a temperature coefficient (a2) of the external input resistor.

Abstract: An angular velocity sensor device includes a structure having an angular velocity detecting element and a vibration body formed thereon. The structure is mounted on the case and the angular velocity detecting element is isolated from external vibrations without the need for rubber and gel vibration dampening materials. Permanent magnets of the same polarity are mounted opposite one another on the structure and the case. The magnetic repulsion is generated between the structure and the case to cause the structure to be housed within the case in a levitated state.

Abstract: An instrument, method, use and software program to obtain information rapidly about microorganisms that may spread uncontrolled in hospitals, water supply, food or when used in bio terrorism are described. Vibrational spectroscopy provides data to a computer linked to one or more databases. Comparison of the spectral data and information retrieved from the databases is used to identify and classify the microorganisms, applying suitable algorithms, which algorithms are self-generating and self-adapting to new spectroscopic data. The system may alert for the detection of an outbreak or to take disinfection measures. Changes in the traditional taxonomic division of microorganisms have no influence on the instrument. It does not rely on an a priori knowledge about the taxonomic classification of the microbial strain, is straightforward and easily integrated in routine microbial procedures.

Abstract: Methods and apparatus for reducing crosstalk in a structural health monitoring system. A pair of actuator input signals are sent to an actuator, each resulting in the transmission of stress waves to a corresponding sensor. The sensor then converts these stress waves to a pair of output signals, each having a crosstalk portion due to electromagnetic interference from the input signals to the actuator, and a stress wave portion corresponding to the stress waves. Various methods of varying the actuator input signals, the input to the actuator, and the output of the sensor result in two output signals that can be combined so as to reduce the crosstalk portions and isolate the stress wave portions. This allows actuators and sensors to be placed sufficiently close together that the stress wave portions of sensor output signals can overlap their crosstalk, without corrupting or otherwise compromising the data contained therein.

Abstract: Methods and apparatus for detecting particles flowing in a fluid within a conduit involve analysis of acoustic pressure signals detected with an array of at least two pressure sensors. The analysis can include monitoring for attenuation in power of the acoustic disturbances within the fluid and/or a reduction in a speed of sound in the fluid. This attenuation in power or reduction in the speed of sound can be detected to provide an output or otherwise indicate that particles are present in the fluid.

Abstract: It should be possible to balance microphones and hearing apparatus more reliably. To this end, provision is made for a method for checking a measuring situation, wherein at least two measurement points of a frequency response of the hearing apparatus are recorded. A check then establishes whether the at least two measurement points lie in a predetermined tolerance range above a threshold. If this is the case, an OK signal is output. Otherwise, if at least one of the measurement points lies outside the tolerance range, the position of the measurement point outside the tolerance range is ascertained and a fault signal is output depending on the ascertained position. It is therefore possible to establish, for example, whether a measuring chamber lacks proofness, a microphone is blocked or the microphone is completely malfunctioning.

Abstract: An ultrasonic probe for examining an item. The probe includes a body having a contact surface adapted for contacting the item when being examined and an ultrasonic transducer attached to the body and spaced from the contact surface. The probe further includes a spacer positioned in the body between the transducer and the contact surface for spacing the transducer from the item when being examined. The spacer includes a coupling surface facing the item when being examined and a transducer surface facing the transducer. The probe also includes a fluid outlet positioned adjacent the coupling surface of the spacer for delivering coupling fluid to the coupling surface as a film so that the coupling fluid tends to maintain contact with the spacer due to surface tension after the fluid is delivered through the outlet.

Abstract: A system and method for monitoring the vibrations of a machine that includes a reflective patch affixed to the machine and a vibration detection unit including an optics module. The optics module may be positioned remotely from the machine such that the optics module transmits an electromagnetic beam to the reflective patch and reflected from the reflective patch to the optics module. The optics module demodulates the electromagnetic beam to determine the vibration of the machine.

Abstract: A specimen is sequentially sampled by a probe, and at least one of the number of times of cleaning and a cleaning time when cleaning the probe is changed based on at least one of the number of times of sampling of the specimen by the probe and a sampling amount of the specimen.

Abstract: An apparatus and method for mini core in drilling samples accumulated in the cups by sample catcher. It allows the explorations to obtain high resolution formation evaluation on drilling cuttings samples. The Mini Core apparatus consists of narrow tubular with a piston or cap. The thin wall tubular is rotated and/or vibrated and pressed in to the cup with wet sample of drilling cuttings. The piston or cap is placed after the desired depth of sample is reached and the vacuum is reestablished. The core is pulled out from the cup and then analyzed within the tubular or squeezed out on a flat tray for horizontal analysis. The micro layering can be visually separated, before they are mixed as in conventional sample and the information is lost.

Abstract: A shift fork restrictor operably disposed in a transfer case for the purpose of allowing the shift motor to transfer energy to the currently existing double wound spring, where the energy is stored until the shift motor sensor indicates that the motor is in the proper range location. When the motor is in the proper range location, the stored energy in the spring is released by the shift fork restrictor releasing the cam allowing for maximum torque and speed to be provided through the secondary rail, cam, and shift fork to complete the requested range shift. This configuration can be used to, among other things, select a high or low range in the transfer case, as well as couple the input and output shafts together, which have different gear ratios.

Abstract: In a power steering apparatus using a mounting device attaching a steering gear housing to a vehicle body side while holding, the mounting device welds an inner surface of a slit provided in each of a plurality of positions in a peripheral direction of a holding portion of a bracket to the steering gear housing, welds a joint piece of the bracket to an outer periphery of a collar, and allows a bolt inserted to an inner periphery of the collar to be screwed to the vehicle body side.

Abstract: A pinion shaft (7) formed using a non-refined steel as a material comprises a shaft section (71, 72) and a pinion teeth forming section (70) connecting with the shaft section (71, 72). The pinion teeth forming section (70) comprises pinion teeth (7a) and a tooth bottom (7b). The pinion teeth forming section (70) and the shaft section (71, 72) are provided with a hardened layer (80) that has been subjected to induction hardening and tempering. The steel contains 0.45 to 0.55% by mass of C, 0.10 to 0.50% by mass of Si, 0.15 to 0.25% by mass of Mo, and 0.0005 to 0.005% by mass of B. The surface hardnesses of the pinion teeth forming section (70) and the shaft section (71, 72) are 650 to 760 HV in terms of Vickers hardness.

Abstract: The present invention relates to a device and method for pre-stressing the cable system of a vehicle brake actuating system.

Abstract: A bicycle control device is provided that has a base member, an electrical shift control switch and a brake lever. The base member has a handlebar mounting portion configured to be fixedly mounted to a free end of a handlebar and an electrical switch housing portion extending longitudinally from the handlebar mounting portion such that a center axis of the free end of the handlebar extends longitudinally through the electrical switch housing portion when the base member is mounted to the free end of the handlebar. The electrical shift control switch is mounted to the electrical switch housing portion of the base member. The brake lever is pivotally attached to the base member to be selectively moved relative to the base member between a rest position and a braking position.

Abstract: An anti-loosening device for a parking brake is provided to securely park a vehicle comprising: a ratchet wheel (20) having multiple teeth (21) formed on an arc-shaped edge, a pivot hole (22) located at a center of the arc, an operating lever (40) having an upper portion forming a tube-shaped handle, a lower portion forming a flat and narrow cavity, a latching mechanism (60) consisting of a pawl (61), a slot (62), a rotating shaft (31), and an elastic spring (80), a lever operating mechanism consisting of an operating rod (70), a coil spring (71), and a push button (72), wherein the operating lever (40) is mounted on the ratchet wheel (20) for rotation with respect to the pivot shaft (30), one end of the operating rod (70) is mounted on the push button (72) with the coil spring (71) and the other end of the operating rod (70) is connected to the slot (62) of the latching mechanism (60).