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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.
Cam-follower dwell mechanisms are used in pairs in sewing machines to operate the four motion feed dogs, with one cam moving the dog up and down, and the other cam moving the dog forwards and backwards. The cams in this application are usually phased 90 degrees apart allowing a pause in the up/down movement of the dog while it is being moved ...
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.
The first roller skate was an inline skate design, effectively an ice skate with a line of wheels replacing the blade. In modern usage, the term typically refers to skates with two pairs of wheels on shared axles like those of skateboards (early versions of which were made using roller skate parts). Skates with this configuration are also known ...
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.
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 ...
Vert skating or vertical skating is a discipline using skates like inline skates or roller skates on a vert ramp, a style of half-pipe. In vert skating, the skater is able to achieve more air-time as compared to other styles of skating, meaning skaters can perform complicated aerial maneuvers and acrobatic tricks, such as spins and flips.
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.
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related to: cam follower vs roller skates for adults in tyler texas images