Abstract: A control shaft extends through and is rotatable in a housing parallel to a stub shaft therein which has one end extending through one wall thereof. Within the housing are four bevel gears, one being keyed or fixed to the control shaft, a second rotatable on and relative to the control shaft, and the remaining two meshing with the first and second ones and carried on a block that is rotatable on and relative to the control shaft. The second bevel gear is keyed to the larger of a pair of meshing spur gears, such larger gear being rotatable relative to the control shaft and the smaller spur gear being fixed to the stub shaft. Respective discs are fixed on the adjacent ends of the two shafts, and articulated holding devices are operable to alternately hold and release the discs.

Abstract: A partition is disclosed wherein one strip has a tab formed at the inner end of an elongated slot, such tab having score lines to facilitate inward collapsing thereof when engaged by the inner end of an elongated slot in the other strip. In the strip with the tab, the outline punched therein for the tab has pronounced shoulders spaced apart less than the width of the tab proper, so that the body of the tab locks against such shoulders when the tab is collapsed. Thus collapsed, the body of the tab extends along the surface of the other strip and prevents relative rotation of the strips towards collapsed condition.