Telescopic Jack Units

Two stage telescopic jack units (TJR series) consist of upper and lower pistons, a cylinder, and a head bearing and packing gland for each piston. The lower piston is fitted with an additional packing gland at the lower end which rides against the internally honed cylinder. Three stage telescopic jack units (TJ3 series) consist of upper, intermediate, and lower pistons, a cylinder, and a head bearing and packing gland for each piston. The intermediate and lower pistons are fitted with additional packing glands at their lower ends which ride against the internally honed cylinder and lower piston. All telescopic jacks have a synchronous design where all pistons raise and lower at the same speed and at the same time.

Applicable Standards
  • ANSI/ASME A17.1/CSA B44

    Safety Code for Elevators and Escalators

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