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A cam follower, also known as a track follower, [1] is a specialized type of roller or needle bearing designed to follow cam lobe profiles. Cam followers come in a vast array of different configurations, however the most defining characteristic is how the cam follower mounts to its mating part; stud style cam followers use a stud while the yoke style has a hole through the middle.
A pair of Heelys. Heelys (formerly known as Heeling Sports Limited) is an American brand of roller shoe (marketed by Heelys, Inc.) that have one or more removable wheels embedded in each sole, similar to inline skates, allowing the wearer to walk, run, or, by shifting their weight to their heels, roll.
A roller skate has two main parts: the boot and the plate, which is the part that holds the wheels and provides the ability to steer. There are two main categories of roller skate boots: a high-top boot with a raised heel similar to an ice figure skating boot, and a flat-soled boot cut at or below the ankle.
Cams can be characterized by their displacement diagrams, which reflect the changing position a follower would make as the surface of the cam moves in contact with the follower. In the example shown, the cam rotates about an axis. These diagrams relate angular position, usually in degrees, to the radial displacement experienced at that position.
Unidentified woman roller skater, c. 1860–1870 Roller skates in the United States around 1905. The earliest roller skates known are from 18th-century Europe. These skates were used in theater and musical performances, possibly to simulate ice skating onstage. Early roller skating was done in a straight line because turning or curving was very ...
Having a roller skating birthday party became something of a rite of passage for American children in the 1950s, 1960s, 1970s, and 1980s. Roller rinks in the United States underwent significant changes in the 1970s. New plastics led to improved skate wheels—ones providing a smoother, quieter ride—and easier-to-maintain skate floors.
Artistic roller skaters skate on quad skates or inline skates (for the inline free skating discipline). Skates consist of four essential parts: boots, plates, wheels, and bearings. Skaters may sometimes use jump bars on their plates for added stability. Free skaters (both quad and inline) have a toe stop on their plates.
Recreational Road 255 (RE 255) is a 56.596 miles (91.082 km) Recreational Road located in Tyler, Jasper, and Newton counties, in southeastern Texas, United States. The highway travels through mainly rural areas in the northern portion of the three counties.
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