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2. 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.

3. Torsion spring - Wikipedia

   en.wikipedia.org/wiki/Torsion_spring

   Garage Door Sectional 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.

4. 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 ...

5. Torsion bar suspension - Wikipedia

   en.wikipedia.org/wiki/Torsion_bar_suspension

   Torsion bar suspension inside Leopard 2 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 ...

6. Still need to buy a Christmas tree? Here's the good news. - AOL

   www.aol.com/news/still-buy-christmas-tree-heres...

   Extreme weather and a smaller supply of tree has pushed up prices, but this year consumers are getting break.

7. National Guard will be pulled from NYC migrant shelters ... - AOL

   www.aol.com/national-guard-pulled-nyc-migrant...

   National Guard soldiers’ mission to help New York City’s overburdened migrant shelters will be “completed” next week, The Post has learned. The deployment of New York Army National Guard ...