Yes there are. There are sliding gears inside power drills.
that safety
Clocks and watches have internal gears. Bicycles and can openers have external gears.
go inside and pull the rope at the top
Some axles have adjusters on the inside that need loosened, others require a spreader to spread the axle assembly enough for removal.
The transmission input shaft has gears on it that mesh with the different drive gears. It is spun by force from the engine, as you select different gears with the shifter, there are different sets of gears being meshed together inside transmission. The synchronizers ensure that the gears being meshed together are turning at the same speed, thus resulting in a smooth shift and no damage to the gears.
You go inside the clock tower, make your way to the top, use the oil can, and grease the gears that directly connect the two large gears.
That depends on what kind of gears, wires, and functions are inside the box.
It's inside the transmission (between the engine and the gears).
On a 1995 Ford Bronco : The rear gears are INSIDE the rear differential ( pumpkin ) located in the middle between the 2 rear wheels
Throw a grenade inside of one, and it'll collapse in on itself.
Run through it by holding A and running through the teeth.