Abstract: There are disclosed several embodiments of a disc brake caliper assembly in which adjustment is made for wear on the pads by a non-rotating linearly expandable and retractable linkage arranged between a brake actuator and the pads. The linkage includes inner and outer members coaxially reciprocal without rotation with respect to one another, one member having surfaces which extend at acute angle with respect to the axis and opposite surfaces on the other member which extend parallel to the axis. Circumferentially spaced wedges are disposed in the space between the angled and parallel surfaces, and springs between the first member and wedges yieldably urge the wedges in the first longitudinal direction toward the angled surfaces, the second member being movable during the braking cycle in a second longitudinal direction and thus relatively to the first member, whereby the linkage is caused to expand in order to adjust for wear.

Abstract: A lock mechanism for use with a screen having a generally square or rectangular configuration and elongated hooks or flanges along two opposed side edges thereof, and rails which extend along and engage the hooks. The lock mechanism comprises at least one arm and a crank. The arm has an outer end coupled to a rail and an inner end pivotably connected to the crank. The crank is rotatable about an axis and it is pivotably connected to the arm on an axis which is spaced from the axis of rotation. Rotation of the crank in one direction causes the arm to be extended outwardly and stretch the screen; rotation of the crank in the other direction retracts the arm and relaxes the screen. A lock is provided between the arm and the crank to hold the arm extended, and a spring is preferably provided between the arm and the associated rail. Preferably a second arm, connected similarly to the first mentioned arm, connects the crank with the other rail.