HFC19 Toggle Joint Apparatus

HFC19 Toggle Joint Apparatus

This apparatus is designed to evaluate forces within a toggle mechanism. Load is applied to the two pairs of links by a hanger suspended from their connecting pivot. One end of the links is pivoted to a base, and the other end is able to move sideways on low friction ball bearing wheels. The moving links are restrained by a horizontal spring balance, which measures the horizontal reaction directly. The angle of the toggle can be varied.

Adjustment is provided for returning the geometry of the loaded toggle to its original unloaded state before taking measurements. The supporting blocks are not supplied.

There are many ways in which the forces can be determined theoretically. The instruction sheet provided with the apparatus takes the opportunity to introduce the use of velocity diagrams to solve essentially static problems by considering virtual motion. However, other techniques can be used if desired.

This equipment is part of a range designed to both demonstrate and experimentally confirm basic engineering principles. Great care has been given to each item so as to provide wide experimental scope without unduly complicating or compromising the design. Each piece of apparatus is self-contained and compact. Setting up time is minimal, and all measurements are made with the simplest possible instrumentation, so that the student involvement is purely with the engineering principles being taught. A complete instruction manual is provided describing the apparatus, its application, experimental procedure and typical test results.

HFC19 Toggle Joint Apparatus
  • Determines the horizontal reaction due to loading a toggle joint mechanism; assesses the effect of the toggle angle.
  • The apparatus consists of two pair of links mounted on a base with one end of the links fixed, a central pivoted joint, and the other end restrained by a spring balance to read the resulting horizontal force.
  • Loading applied at the apex pivot by a weight hanger.
  • Variable toggle angles available, and facility to re-adjust to original state.
  • An instruction manual for student and lecturer provided.
  • Set of weights.
  • 1m ruler supplied
  • 2 year warranty
  • To determine the experimental horizontal reaction due to loading
  • To compare with theoretical predictions, such as the velocity diagram technique
  • To assess the effect of the toggle angle