35results about How to "Small contact surface" patented technology

A vibration damper (2) that is effective in the direction of rotation of a drive shaft and has a small radial extension. For this purpose, a first shaft part (6) is provided as a sleeve (8) and a second shaft part (7) is provided as an inner part extending axially into the sleeve (8). The two shaft parts (6, 7) engage via rotary drivers in complementary negative profiles (15, 16) of an interposed elastic damper part (10) in the direction of rotation. In addition to the negative profiles, the damper part may be provided with recesses (40) which modify its damping characteristics.

A built-in antenna having a center feed structure for wireless terminal. The antenna includes: a feeding means for providing an electromagnetic signal; and a radiating means for radiating the electromagnetic signal, wherein the feeding means is located on a point ranging from a midpoint of the antenna. The antenna radiates a nondirectional signal and can be embedded in a wireless terminal.

A starter for an internal combustion engine includes a power transmission mechanism. The power transmission mechanism has an outer race plate fastened to a crankshaft, and a ring gear coupled to a rotational shaft of an electric motor for starting the engine. The power transmission mechanism further has a one-way clutch for permitting torque transmission only from the ring gear to the outer race plate, and two sealing members. Lubricant is supplied from the cylinder block to the interior of the power transmission mechanism for lubricating the power transmission mechanism. The outer race plate has a groove on its contact surface of a contact portion between the crankshaft and the outer race plate. The groove extends in the entire circumferential direction of the crankshaft. This maintains the coupling strength between the outer race plate and the crankshaft, while enhancing the sealing performance of the power transmission mechanism.

The invention relates to a progressive slow piling steaming box which is suitable for the steaming and the rinsing or the dying after the cold pad-batch pretreatment and the piling and the steaming before the printing of pure cotton and cotton-polyester blended fabrics. The steaming box comprises a box body (1), a progressive slow piling device (4) and a cloth supporting basket (5), wherein the progressive slow piling device (4) and the cloth supporting basket (5) are arranged in the box body (1); the progressive slow piling device (4) comprises a gear box motor (4.15), three transmission shafts (4.14), four rocker arm mechanisms and a cloth moving basket (4.16); a plurality of cloth supporting strips I (4.16.1) and a plurality of cloth supporting strips II (5.1) are convexly arranged on the cloth moving basket (4.16) and the cloth supporting basket (5) and distributed along the length direction of the box body; and the cloth supporting strips I (4.16.1) on the cloth moving basket (4.16) and the cloth supporting strips II (5.1) on the cloth supporting basket (5) are mutually spaced. The steaming box can ensure that the surfaces of fabrics cannot be scratched to have grinding defects and can not be scalded and has uniform and thorough steaming effect.

The invention discloses a preparation method of ferric chloride hexahydrate. The method is characterized by comprising the following steps: firstly, determining that a reaction system for preparing ferric chloride hexahydrate contains H2O and FeCl3; secondly, setting the dosing coefficient theta (theta=M_H2O/M_FeCl3) of the reaction system for preparing ferric chloride hexahydrate, wherein M_H2O represents the mass number of H2O in the reaction system and the M_FeCl3 represents the mass number of FeCl3 in the reaction system; finally, adjusting the mass numbers of H2O and FeCl3 in the reaction system according to the dosing coefficient theta (theta=2/3), uniformly stirring at 20 DEG C, standing for 8 hours, pouring into a mould when stirring until solids are separated out, and curing for forming to obtain blocky ferric chloride hexahydrate; or, adjusting the mass numbers of H2O and FeCl3 in the reaction system according to the dosing coefficient theta (theta=0.89-1.2), and stirring for cooling to obtain sand-shaped ferric chloride hexahydrate.

A drill (1) for producing a drilled hole in workpieces comprising fibre-reinforced plastic is proposed, with at least one main cutting edge (3) on the end face, with at least one secondary cutting edge (11), provided in the region of a circumferential surface (9) of the drill (1), and with circularly ground lands (21), circumferentially adjoining the at least one secondary cutting edge (11, 11'). The drill is distinguished by the fact that the preferably continuous circularly ground lands (21) have, starting from a front region of the drill (1), a first longitudinal portion (22) with a first width (B1) and, adjoining thereto, a second longitudinal portion (24) with a second width (B2), wherein the width (B1) of the first longitudinal portion (22) is less, preferably less by a multiple, than the width (B2) of the second longitudinal portion (24).

The invention discloses a power head movement friction pair for a down-hole drilling machine. The power head movement friction pair for the down-hole drilling machine comprises guide rails, wherein a power head mounting seat is mounted on the guide rails in a sliding manner and is provided with a connecting plate which is mounted at the tops of the guide rails in the sliding manner; a power head is fixedly mounted at the top of the connecting plate; a plurality of pairs of guide plates are mounted on the left side and the right side of the bottom of the connecting plate; a hook plate which extends to the guide rails is arranged at the bottom of each guide plate; the hook plates buckle the guide rails and are mounted with the guide rails in a matching manner; the power head movement friction pair for the down-hole drilling machine is characterized in that a plurality of pairs of roller mounting holes are formed in the positions, right above the two guide rails, of the connecting plate; a rotatable roller is mounted in each roller mounting hole; the bottom of each roller is lower than the bottom of the connecting plate and is in rolling connection with the guide rails. According to the power head movement friction pair for the down-hole drilling machine, the surface-surface sliding contact between the connecting plate and each guide rail is changed into the rolling contact between each roller and the guide rails, so that the contact area is small; the running resistance of the power head is reduced; the guide rails are not easily worn; the service life of the power head movement friction pair is longer.

A length-adjustable column for chairs or the like comprises an upright tube with a longitudinal axis and a piston-and-cylinder unit radially supported and displaceably guided in the direction of the longitudinal axis. A lengthwise end of the piston-and-cylinder unit is locked by means of an axial bearing on a base plate of the upright tube in the axial direction. For this purpose, the axial bearing is axially fixed to the lengthwise end of the piston-and-cylinder unit. The axial bearing has at least two locking arms which lock it to the base plate of the upright tube, and a securing bolt which is pushed by the piston-and-cylinder unit between the locking arms to secure the locking.