We carry a full line of Doorking gate operators. If you don’t see the operator you are looking for, call us or email us we can get it for the lowest price in the market.

DoorKing manufactures and distributes telephone entry systems, telephone intercom systems, card access systems, digital access systems, electromagnetic locks, high security RF access controls, automatic vehicle ID systems, vehicular gate operators, parking control products, and a variety of accessories to complete your access control requirements. DoorKing provides outstanding warranties and excellent technical assistance

DoorKing vehicular gate operators meet and exceed the safety requirements as defined in Underwriters Laboratories Standard for Safety - UL and UL 991. DoorKing engineers designed their line of vehicular slide and swing gate operators with the following safety concerns in mind:

Safer Gate Operators - How Do We Do It?

Most vehicular gate operator accidents happen when people attempt to "reach through" the gate to activate a key switch, push-button, or some other device that can open the gate, and they end up trapped in the gate and fence when the gate operator starts to open the gate. Another form of accident is for a person to be entrapped between the gate and fence. DoorKing was the first company to recognize these hazard areas, that most gate accidents happened during the OPENING cycle, and designed their gate operators to specifically address this issue. In fact, up until the UL 325 Safety Standard was revised, many vehicular gate operators offered absolutely no protection during the open gate cycle.

1. TWO MEANS of ENTRAPMENT PROTECTION - ELECTRONIC and MECHANICAL

DoorKing gate operators are designed with both a mechanical slip clutch and a magnetic sensing system that monitors the gate operator output shaft rotation speed. If the gate meets an obstruction in either the opening or closing cycle, the clutch will slip which in turn will cause the operator to reverse direction. If the clutch fails to slip (mechanical failure? adjusted too tight?), the magnetic system will detect the slowdown in the shaft rotation speed and will stop and then reverse the direction of gate travel. In addition to this double sensing system, the microprocessor on our circuit boards checks the magnetic sensing system once each gate cycle. If the microprocessor detects any anomalies, the motor will not start. This assures that the obstruction sensing system is operational when the operator starts its cycle.

2. FAIL-SAFE ENTRAPMENT PROTECTION

According to the U.L. 325 Safety Standard, once a second sequential obstruction is detected by the entrapment sensing system (prior to the operator reaching an open or close limit device), the operator must a) stop, b) require a renewed intended input (via an integral control or a wired remote in the line of sight of the gate) prior to enabling any automatic actuation devices, and c) activate the entrapment alarm. (ref UL 325 - 30A.1.2b)

This sequence of events described in the paragraph above is what we call a "HARD SHUTDOWN" meaning that the operator will not run until the manual reset switch is activated. There are some things that you need to be aware of regarding hard shutdowns. Underwriters Laboratories has determined that a second obstruction event (prior to the gate reaching a limit) is a good indication that an entrapment may have occurred. The requirement to stop the operator, require an intended input in the line of sight of the gate to reset the operator and sounding the alarm are all designed to require human intervention to return the gate operator to normal operation. The school of thought is that a human would see an entrapment in the gate and can take appropriate action before returning the operator (reset switch) to normal operation. You must also be aware that during a hard shutdown, the gate operator is just that - SHUT DOWN. Most operators under these conditions will remain locked (as when the gate is closed) and will prevent a person from freeing themselves, or hinder rescuers from freeing them, from the entrapment.

DoorKing believes that this FAIL-ENTRAPMENT type of operation does not provide the safest operating environmnt possible and can prove to be dangerous to a person who is entrapped in the gate. Furthermore, if the operator does not have a FAIL-SAFE release mechanism, then precious time can be wasted as cranks, keys, or other release devices are attempted to be located. To overcome these deficiencies, DoorKing gate operators use FAIL-SAFE ENTRAPMENT LOGIC that prevents a person from being trapped in the gate and allows them to free themselves.

If an entrapment were to happen on a DoorKing slide gate operator, the following occurs:

The gate immediately stops (meets the UL 325 requirement). Sounds the entrapment alarm for a minimum of five (5) minutes (meets the UL 325 requirement).
Requires the reset switch located on the operator to be activated before the operator can resume normal operation (meets the UL 325 requirement).
Releases pressure on the gate (EXCEEDS THE UL 325 REQUIREMENT).
Assumes a FAIL-SAFE condition allowing the gate to be manually moved without the need of any cranks, keys or other mechanical release devices (EXCEEDS THE UL 325 REQUIREMENT).

3. FAIL-SAFE RELEASE LOGIC

The UL 325 Safety Standard states that a vehicular gate operator shall have a means for manual operation and that the means for manual operation shall be supplied as an integral part of the operator (ref UL 325 - 30A.1.20). DoorKing gate operators (except Class IV products) are designed to assume a Fail-Safe condition when a power outage occurs. Simply stated, the operator "fails" in a "safe" condition allowing it to be manually operated without the need of any cranks, keys or other release devices. The Fail-Safe release in DoorKing operators meets and exceeds the UL requirement. Other operators assume a fail-secure condition which locks the gate when power is lost. This requires the use of cranks, keys or other release devices which typically are not available at the gate when needed, and in most cases must be operated from inside the gate making them useless for persons or emergency vehicles on the outside of the gate.