Ace Wire Spring

Drawbar Springs

DrawbarDrawbar springs are assemblies in which the spring will compress as the drawbar arms extend under an applied load. They are often capable of withstanding loads far in excess of the compression spring closing force and should be considered in applications where a positive stop or overload protection is required.

Compression springs can be used as an extension spring when it is fitted with a drawbar. This is often done when a regular extension spring might be deflected excessively and results in failure.

The compression spring should be designed with a safe stress at the solid height so that it will not take a permanent set. The drawbar can be made from any grade of hard-drawn wire, as they are quite strong if made with the same diameter of wire as used in the spring.

The drawbar ends should be closed, but not ground. Many sizes of springs have been made in this manner. One of the features is that such springs have a fixed stop when the spring goes solid, thereby eliminating overstretching. Another good feature of the drawbar is the elimination of buckling. The drawbar should be lubricated during operation to reduce friction.

Ace Wire Spring & Form is a manufacturer of drawbar springs an invites your quote requests below.

Design Formula & Specs

In Ordering Give The Following Springs Specs As Completely As Possible:

Assembly Length, Maximum, Minimum. Spring Length, Maximum, Minimum

Controlling Diameter, Outside Diameter Maximum. Inside Diameter Minimum. Pitch Diameter. Works Inside (Dia. Hole). Works Over (Dia. Shaft).

Number of Coils.

Wire Size. Decimal size if possible. Material, Kind and Grade.

Loads at deflected positions.

Style of Ends, (see illustrations). Standard, Strap, Eye, Enlarged

Finish. Plain unless otherwise specified.

Maximum Solid Length.

Frequency of Compression.

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Drawbar Gif


How to Determine Rate For Drawbar Springs

Rate which is the change in load per unit deflection, may be determined by the following procedure:

  1. Deflect spring to approximately 20 percent of available deflection and measure load (P1) and spring length (L1).

  2. Deflect spring to approximately 80 percent of available deflection and measure load (P2) and spring length (L2). Be certain that no coils (other than closed ends) are touching L2.

  3. Calculate rate (R) lb./in. (N/mm)
    R = (P2 - P1) / (L1 - L2)

Drawbar Spring Image

Design & Specifications

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The "ACE" Advantage

ACE specializes in custom precision springs and wire forms and offers a distinct advantage by utilizing the most advanced spring design software. ACE validates each existing and/or new design. If exceptions are taken on the design, we will notify the customer with our recommendations.

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