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  2. Riefler escapement - Wikipedia

    en.wikipedia.org/wiki/Riefler_escapement

    In the Riefler escapement, the energy required to keep the pendulum swinging is instead supplied by bending the short straight spring strip which suspends the pendulum. [4] The upper end of the suspension spring is not attached to a fixed support as in most clocks, but instead is attached to a heavy metal bearer, which pivots on two aligned ...

  3. Door knob - Wikipedia

    en.wikipedia.org/?title=Door_knob&redirect=no

    This page was last edited on 30 June 2018, at 12:36 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...

  4. Grasshopper escapement - Wikipedia

    en.wikipedia.org/wiki/Grasshopper_escapement

    Grasshopper escapement, 1820. The grasshopper escapement is a low-friction escapement for pendulum clocks invented by British clockmaker John Harrison around 1722. An escapement, part of every mechanical clock, is the mechanism that gives the clock's pendulum periodic pushes to keep it swinging, and each swing releases the clock's gears to move forward by a fixed amount, thus moving the hands ...

  5. Door handle - Wikipedia

    en.wikipedia.org/wiki/Door_handle

    This is an accepted version of this page This is the latest accepted revision, reviewed on 16 February 2025. Device to open or close door Various examples of door handles throughout history A door handle or doorknob is a handle used to open or close a door. Door handles can be found on all types of doors including: exterior doors of residential and commercial buildings, internal doors ...

  6. Escapement - Wikipedia

    en.wikipedia.org/wiki/Escapement

    Animation of an anchor escapement, widely used in pendulum clocks. An escapement is a mechanical linkage in mechanical watches and clocks that gives impulses to the timekeeping element and periodically releases the gear train to move forward, advancing the clock's hands.

  7. Pendulum clock - Wikipedia

    en.wikipedia.org/wiki/Pendulum_clock

    A pendulum clock is a clock that uses a pendulum, a swinging weight, as its timekeeping element. The advantage of a pendulum for timekeeping is that it is an approximate harmonic oscillator : It swings back and forth in a precise time interval dependent on its length, and resists swinging at other rates.