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2. Garage door - Wikipedia

   en.wikipedia.org/wiki/Garage_door

   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 reduce the human or ...

3. Torsion spring - Wikipedia

   en.wikipedia.org/wiki/Torsion_spring

   A mousetrap powered by a helical torsion spring. Video of a model torsion pendulum oscillating. A torsion spring is a spring that works by twisting its end along its axis; that is, a flexible elastic object that stores mechanical energy when it is twisted. When it is twisted, it exerts a torque in the opposite direction, proportional to the ...

4. Garage door opener - Wikipedia

   en.wikipedia.org/wiki/Garage_door_opener

   A residential garage door opener. The motor is in the box on the upper-right. A garage door opener is a motorized device that opens and closes a garage door controlled by switches on the garage wall. Most also include a handheld radio remote control carried by the owner, which can be used to open and close the door from a short distance.

5. Torsion bar suspension - Wikipedia

   en.wikipedia.org/wiki/Torsion_bar_suspension

   Torsion bar suspension. Schematic of a front axle highlighted to show torsion bar. A torsion bar suspension, also known as a torsion spring suspension, is any vehicle suspension that uses a torsion bar as its main weight-bearing spring. One end of a long metal bar is attached firmly to the vehicle chassis; the opposite end terminates in a lever ...

6. The Life and Death of an Amazon Warehouse Temp

   highline.huffingtonpost.com/articles/en/life-and...

   On Jan. 18, 2013, as the sun went down, Jeff Lockhart Jr. got ready for work. He slipped a T-shirt over his burly frame and hung his white work badge over his broad chest. His wife, Di-Key, was in the bathroom fixing her hair in micro-braids and preparing for another evening alone with her three sons.

7. Spring (device) - Wikipedia

   en.wikipedia.org/wiki/Spring_(device)

   A torsion spring is a spring that works by twisting; when it is twisted about its axis by an angle, it produces a torque proportional to the angle. A torsion spring's rate is in units of torque divided by angle, such as N·m/rad or ft·lbf/degree. The inverse of spring rate is compliance, that is: if a spring has a rate of 10 N/mm, it has a ...