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2. Electric gate - Wikipedia

   en.wikipedia.org/wiki/Electric_gate

   A sliding electric gate with electric motor and backup battery in case of mains failure. Note also the Infrared obstacle sensor located on the wall to prevent the gate from closing while a vehicle or other obstacle is in the way. Driveway gate openers can be the rollback (sliding) type that retracks a gate along the fence or wall on wheels or ...

3. Chamberlain Group - Wikipedia

   en.wikipedia.org/wiki/Chamberlain_Group

   Chamberlain Group (CGI), the corporate parent company to LiftMaster, Chamberlain, Merlin, and Grifco, designs and engineers residential garage door openers, commercial door operators, security cameras, and gate entry systems. CGI is also the parent company to Controlled Products Systems Group, the largest wholesale distributor of perimeter ...

4. Garage door - Wikipedia

   en.wikipedia.org/wiki/Garage_door

   Garage Door Hardware. A garage door is a large door to allow egress for a garage that opens either manually or by an electric motor (a garage door opener). Garage doors are frequently large enough to accommodate automobiles and other vehicles. The operating mechanism is usually spring-loaded or counterbalanced to offset the door's weight and ...

5. Automatic door - Wikipedia

   en.wikipedia.org/wiki/Automatic_door

   The automatic door used a mat actuator. In 1960, they co-founded Horton Automatics Inc and placed the first commercial automatic sliding door on the market. [5] With the invention of the Gunn diode, microwave motion detectors became common in automatic doors in the 1970s. [6] [7] In 1980, the first automatic door using an infrared sensor was ...

6. Garage door opener - Wikipedia

   en.wikipedia.org/wiki/Garage_door_opener

   The electric overhead garage door opener was invented by C.G. Johnson in 1926 in Hartford City, Indiana. [1] Electric Garage Door openers did not become popular until Era Meter Company of Chicago offered one after World War II where the overhead garage door could be opened via a key pad located on a post at the end of the driveway or a switch inside the garage.

7. Swing-door operator - Wikipedia

   en.wikipedia.org/wiki/Swing-door_operator

   Types. There are 3 basic types of swing door operators: Full Energy – It opens and closes the door at full speed. Low Energy – It opens and closes the door at reduced speed to limit the kinetic energy of the moving door to levels deemed safe for disabled users. Power Assist – This is a version of the low-energy operator.