75results about How to "Reduce contact noise" patented technology

In a transmission chain having link plates with convex edges for sliding contact with a guide surface, the plates are asymmetric in shape so that the distance from a line connecting the centers of the connecting holes and the convex edge is greatest at a position other than at the midpoint between the connecting holes. A pivoting action of the link plates takes place as they slide over a guide surface, changing the abutment point.

The invention discloses a method for testing low-frequency noise of an amorphous silicon membrane, and specifically relates to a testing technology of low-frequency current noise of the amorphous silicon membrane. A testing system adopted by the testing technology comprises a biasing circuit, an electromagnetic shielding device, a noise amplifying system and a data acquisition and processing system. Firstly, the low-frequency current noise of the amorphous silicon membrane is motivated through the biasing circuit, sample low-frequency noise is amplified through a low-frequency noise current amplifier, amplified noise signals are acquired through a data acquisition card, corresponding current noise signal power spectral density is calculated, finally data are analyzed and processed through a computer, and a power spectral density curve of the low-frequency noise of the amorphous silicon membrane is obtained. The method for testing the low-frequency noise of the amorphous silicon membrane can be used for testing the low-frequency noise of the amorphous silicon membrane repeatedly and accurately, and is fast and convenient.

A power transmitting toothed belt having improved positioning accuracy between the toothed belt and a pulley, increased durability, and reduced contact noise, comprising a rubber back layer, a plurality of core wires and a rubber layer having a plurality of belt teeth, wherein the belt teeth are at oblique angle with respect to the direction of the width of the belt. The belt teeth intersect with straight pulley teeth having a pitch equal to the pitch of the belt teeth.

A final reduction gear device including an orthogonal axis gear and a speed reduction mechanism portion employing a planetary gear is provided. A radial bearing, more specifically a cylindrical roller bearing, having a large radial load capacity is disposed between a bevel ring gear of the orthogonal axis gear and a differential case. A thrust bearing, more specifically a thrust ball bearing or a thrust roller bearing, having a large axial load capacity is disposed between an axial end portion of a sun gear, and an inner race side of the radial bearing and the side of a fitting portion of the differential case, to which the inner race is fitted. A thrust bearing, more specifically a thrust ball bearing or a thrust roller bearing, having a large axial load capacity is disposed between the bevel ring gear and a planetary carrier of the speed reduction mechanism portion.

A pneumatic brake booster with short actuating travel, comprising a skirt and a pneumatic piston that are rigidly connected and slideably mounted in a sealed casing to delimit a low-pressure chamber and a variable-pressure chamber and a three-way valve arrangement that is controlled by a control rod connected at a first end to a brake pedal. The three-way valve arrangement having first and second valve seats and a valve that is applied to at least one of the first and second valve seats by a valve spring. The second valve seat being borne by a first longitudinal end of a plunger distributor while the first valve seat is borne by a first longitudinal end of a bushing slideably mounted in a sealed manner in the pneumatic piston over a defined first travel and beyond the defined travel the bushing is secured axially to the pneumatic piston.

A novel-structure electric piano keyboard comprises parts like black keys, white keys and a chassis. The white keys and the black keys are mounted on the chassis through a front rail, a middle rail and a rear rail, a linkage rod is mounted on a main rail through a linkage shaft frame, a cam is mounted on the main rail through a cam shaft frame, an adjusting button is mounted on the main rail through a crab claw, the main rail is mounted on a support, the upper rail and the lower rail are respectively mounted on the support to limit movement positions of a counterweight hammer handle and a counterweight hammer within a range below the upper rail and above the lower rail, the upper end of an ejector rod is abutted against the cam, a hook and the counterweight hammer handle are fixedly mounted on the cam, the hook contacts with ejector rod skin both before and after the keyboard moves, and the hook breaks away from the ejector rod skin in the movement process of the keyboard; the counterweight hammer handle is fixedly connected with the counterweight hammer, and when the black keys or the white keys are strummed to lower to the bottom, the hook mounted on the cam contacts with the ejector rod skin mounted on the ejector rod to stop return movement of the cam so as to prepare for next stressed movement of keys; when fingers of a player leave the keys, the hook can push the ejector rod back to an original position to enable keyboard structure to quickly restore to an original position.

A wire brush for a slipring includes a contact section, from which a stabilizer arm is extending backwards towards the brush block of the slipring. The stabilizer arm holds a friction section, which is in friction contact with the contact section at a friction contact area. Such contact, in operation, generates internal friction within the brush when the brush is moved and, therefore, suppresses oscillations of the brush.

A furniture hinge mounted between a furniture wall and a furniture door so as to be used as an opening and closing mechanism of the furniture door, in which, by using the movement part provided on the body part of the furniture hinge and the adjustment part provided at the movement path of the movement part, the entire length of the furniture hinge is changed by advancing and returning the movement part in the opening and closing process of the furniture door such that, since the furniture wall and the furniture door do not come into contact with each other even though the furniture door is completely opened, the peeling damage to the exterior of the furniture is prevented and contact noise is eliminated, thereby improving the satisfaction of consumers.

The invention provides a cutting device for cattle corrected grain sofa leather, belonging to the field of mechanical technology. The problem of low stability of the prior art is solved. The cutting device for cattle corrected grain sofa leather comprises a rack, a drive member, a fixed knife and a movable knife, wherein the fixed knife is connected with the rack; the drive member is fixedly connected with the rack and connected with the movable knife; when the drive member drives the movable knife to move up and down, the movable knife can contact with the fixed knife, and a cutting position for cutting leather is formed; an oblique cutting face is arranged at the end part of the movable knife; an elastic buffer structure is arranged between the fixed knife and the rack; and under the effect of the elastic buffer structure, the fixed knife tends to go below the cutting face. The device has high stability.

The various embodiments of the present invention disclose a stand-alone, scalable cardiac health monitoring device for 1-6-12 lead ECG data acquisition and a method of working thereof. The method of monitoring cardiac health condition of a patient comprises of receiving, by a cardiac monitoring device, an electrocardiograph (ECG) input data signals from at least two electrodes attached to the patient, performing, a quality check on acquiring the ECG input data signals, processing the acquired ECG input data signals, encrypting the processed ECG input data signals and transmitting the encrypted ECG signals to one or more external user devices over a wireless communication interface. The acquiring the ECG input data signals comprises of integrating a closed loop Right Leg Drive (RLD) as a shield drive and a cable/electrode shield to reduce noise coupling to the ECG input data signals.

The invention discloses a proportional electromagnetic gas valve. One end of a thread connector (5) is fixedly connected with a valve sleeve (7); a valve nozzle (6) is connected to one end of the valve sleeve (7); both the threaded connector (5) and the valve nozzle (6) are located at the same end of the valve sleeve (7); the valve nozzle (6) is provided with a radial through hole (8) and an axial through hole (9) communicated with the valve sleeve (7), and the radial through hole (8) is communicated with the axial through hole (9); an armature (3) is slidably fitted in the valve sleeve (7); one end of the armature (3) may be abutted to an inner end of the axial through hole (9) for sealing, and an elastic return device is disposed between the other end of the armature (3) and an electromagnetic iron stop (2); the electromagnetic iron stop (2) is connected to the other end of the valve sleeve (7); a shell (4) sleeves the valve sleeve (7) and is fixedly connected with the valve sleeve (7); an electromagnetic coil (1) is disposed between the valve sleeve (7) and the shell (4). The proportional electromagnetic gas valve is good in sealing performance.

An organism surface electrical signal detecting electrode array comprises an electrode carrier of a flexible printed circuit board, wherein the electrode carrier adopts double-sided printed circuit wiring; electrode points in array arrangement are arranged on the electrode carrier; the electrode point array of the electrode carrier is averagely partitioned into two zones left and right, and the two zones use 2-3 mm printed circuit PCB wires as ground wires respectively to form full closure; miniature heating resistors are also arranged on the electrode points; each miniature heating resistor is provided with two pins; one pin is connected to a common interface end through PCB wiring on the side opposite to a welding pad; the other pin is connected to a 5V power supply through the PCB wiring on the side opposite to the welding pad; the miniature heating resistor is connected with the welding pad and welding tin in an insulated way; the miniature heating resistor body is embedded into the welding tin. The organism surface electrical signal detecting electrode array can keep the temperature of each electrode point controllable, so that the temperature error is reduced.

This invention relates to ball switch, it includes a shell, at least a ball and a buffer component, and an outer cover. The shell is made by conducting material to form one conducting terminal, the shell has certain basal wall and circle wall from the basal wall to outer side, a room and an open mouth are formed by their cooperation. The ball is made from conducting material, and set in the room as active type. The buffer component is set inner of the room; the cover is made from conducting material to form the other conducting terminal of the ball switch. The terminal is indirectly connected to the shell and set on the mouth to make the ball sealed in the room. The ball switch can effectively reduce vibration noise and improve using quality.