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The Arnold Company is the number one Railcar Gate Door Opener manufacturer in the United States. As home of the Door Demon^® Railcar Hopper Gate Door Opener, we specialize in making custom designed Railcar Gate Door Openers to meet the specific needs of your working environment! We also carry a full line of Industrial Vibrators.

We take pride in our product selection, product quality, and personalized customer service! We offer our customers affordable, practical solutions to their Railcar Gate Door Opener needs and stand behind our products!

Electric (AC) Three Wheel "Spider" Hopper Gate Door Opener

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Three Wheel Door Opener (Spider)

NEW FOR 2012: 20% Torque Power Increase. We are now using a new Char-lynn drive motor that provides the extra torque you need!

Having three wheels makes this Door Demon the largest and most stable we have. Since you cannot tip the unit forward to engage the capstan, a hydraulic arm with cylinder will move the tip from 6” to 20” above the working surface. Since most doors operate at the 12”-16” range, this covers the majority. We will change the working range upon request. The wheels are 15” caster either pneumatic or semi-pneumatic. You can lock the front two wheels with a pin when side motion is not needed.

The electric over hydraulic version is our most popular model. We use a Lesson brand motor in both 3ph and 1ph applications. This motor is explosion proof under class II, group F & G. They are both Hi/Lo voltage, 50-60 Hz motors, 1.25 SF with thermo auto reset. Some Canadian applications will require a weg motor with different specifications.

This motor is connected to a SPF Stone pump which operates at 2950 psi @ 2gpm. This SPF Stone pump drives a char-lynn hydraulic motor that turns the power shaft. The standard shaft length is 20”; additional lengths are commonly made per your request. The driving tip is a standard taper 1 ½” down to ¾”.

The pneumatic version will use a Globe VA6C vane air-motor, bi-directional control system with a maximum continuous speed of 3000 rpm; the intermittent duty is 6000rpm. The axial loads are minimum. Airline filtration & lubrication are 64 microns and 6-7 drops per minute. (See operator’s manual) It will require 90 psi @ 70 cfm; you need a ¾” air line. The Globe 4hp air motor drives a Brevini power transmission that has a 315 to 1 ratio. The amount of torque is related to pressure. This Epicycloidal type transmission is fairly bullet proof. The shaft will turn 12 rpm with no load. NOTE: torque increase is not applicable with the pneumatic model of this unit.

Unit's Physical Dimensions:
54" D x 67" W x 39" H
(see PDF Version for full Dimensions)