31results about How to "Reliable friction" patented technology

A bolt-hole cap for sealing the bolt hole of a rail includes a top face and a bottom face from which multiple protrusions extend. Each protrusion extends radially from inner portion toward outer portion of the bolt-hole cap. Each protrusion has two side faces and an end face connected between the two side faces. The end face has a first width. When the bolt-hole cap is inserted into a bolt hole and the top face of the bolt-hole cap is in flush with the top face of the rail, the end face of each of the protrusions contacts the bolt in the bolt hole. The protrusions are plastically deformed toward the side faces and the end face has a second width which is wider than the first width, so that the bolt-hole cap has sufficient strength to keep the top thereof flushing the top of the rail.

A bolt-hole cap for sealing the bolt hole of a rail includes a top face and a bottom face from which multiple protrusions extend. Each protrusion extends radially from inner portion toward outer portion of the bolt-hole cap. Each protrusion has two side faces and an end face connected between the two side faces. The end face has a first width. When the bolt-hole cap is inserted into a bolt hole and the top face of the bolt-hole cap is in flush with the top face of the rail, the end face of each of the protrusions contacts the bolt in the bolt hole. The protrusions are plastically deformed toward the side faces and the end face has a second width which is wider than the first width, so that the bolt-hole cap has sufficient strength to keep the top thereof flushing the top of the rail.

A friction device for rolling up curtains and the like includes a tubular roller (1), on which a curtain (1a) is wound. The roller (1) is rotatably carried by a support (10) and a threaded stem (2) is situated axially inside the roller (1) and carries, mounted thereon by a screw coupling, an operative body (3), likewise situated inside the roller (1). The operative body (3) translates axially with respect to the threaded stem (2) during motion of the curtain (1a) from a rolled up configuration (A) to a unrolled configuration (B). Elastic blocks (41, 51) push on the operating body (3) to produce a friction effect on the operating body and transmitted to roller (1) during curtain (1a) transition between the unrolled and rolled up configurations, thus allowing operation of the curtain in a substantially balanced way during rolling up and / or unrolling. Stop nuts (40, 50) are fastened to the threaded stem (2) for compressing the elastic blocks against surfaces of the operating body (3).

The invention discloses a friction sliding block for a high-rise escape device. The friction sliding block comprises an arc guide rail block and a sliding friction pair. The sliding friction pair is mounted at the upper end of the arc guide rail block, and is closely attached to an arc-shaped guide rail. The front end of the arc-shaped guide rail block is fixedly connected with a connecting plate,and the middle of the front side of the connecting plate is fixedly connected with a rotary pair. The rotary shaft is connected to a track trolley through a bearing. According to the friction slidingblock, the arc-shaped guide rail and the friction pair are adopted, and bearing and friction slowing down can be achieved conveniently in the falling process. The track trolley can be kept in the vertical direction all the time through the rotary shaft, the palm is prevented from being scratched, and use safety is improved.

A borate ester represented by the following formula:where R1 is a hydrocarbon chain, R2 and R3 are independently either a hydrogen atom or a hydrocarbon chain, and m and n are independently from 1 to 5.

An anti-symmetric arrangement-type single piezoelectric stack-driven bidirectional rotary inertial actuator, and a method. The actuator is composed of an upper end cover, a bearing, an output shaft, a rotating disc and an actuating mechanism. The actuating mechanism is machined in one piece, and is anti-symmetrically arranged around the center of a rhombic ring comprised therein. The inside of the rhombic ring is axially interference-fitted with a piezoelectric stack. Planes on both sides of the rhombic ring in an axial direction are rigidly connected with an L-shaped lever amplifying mechanism, respectively. One end of an axial rod of the L-shaped lever amplifying mechanism is connected to a mounting base via a flexible hinge, and the other end is fixedly connected with a transverse rod member, and a friction foot is machined to protrude above the transverse rod member. The rotating disc is horizontally placed above the friction foot of the actuating mechanism, and an output shaft is arranged at the center of upper surface of the rotating disc. The output shaft is connected to the spindle-shaped upper end cover by means of a bearing, and both ends of the upper end cover are provided with a mounting through hole, through which the output shaft is closely connected to the actuating mechanism at the bottom end by bolts. The invention has the advantages of small size and novel structure, and can realize high-precision bidirectional rotary motion smoothly only by driving a single piezoelectric stack.