Abstract: A rotatable locking device composed of a flexible plastic material is disposed adjacent the end portions of each pair of legs for barricade structure for streets and highways. The locking device can be rotated into an operating position where it bears against the tips of the end portions of the legs when extended and so locks them into place to thereby keep the legs extended during harsh weather conditions and when the barricade is subjected to repeated gusts of winds from passing trucks. When the barricade is suddenly impacted, however, the end portions of the leg members will spring free from the locking devices owing to elastic deformation or "forgiveness" of the flexible plastic material that comprises both locks and legs to thereby allow the leg members of the barricade to fold or collapse to a safe position.

Abstract: A thumbnut for use with a convex surface is provided with a plastic sheath in which the bottom face thereof has a series of projections arranged in a circumferential manner like the numerals on a clock face. Once the thumbnut is threadedly engaged with a bolt extending from the convex surface, these projections react in a ratchet-like manner with that surface. As the thumb nut is tightened the projections cause it to move alternatively from unstable "override" positions to stable "straddle" positions which effectively lock the thumbnut with respect to the convex surface, regardless of the amount of torque applied to the thumbnut.

Abstract: What is provided is a utility cart of a one-piece rectilinear design supported by two coaxial wheels, the cart having a lipped or beveled portion at the top of its sidewalls and a U-shaped handle pivoted through respective lipped portions at one end of the cart so that the handle may be easily swung down from an operable position to a folded position within the confines of the overall dimension of the cart. When the handle is in its operable position, the free ends thereof are easily secured under the respective lipped portions to thereby give the entire structure the strength and leverage required for proper load-bearing use.

Abstract: A lightweight vertical panel barricade for use on streets and highways in which a first vertical panel is supported and rigidly locked into place by the clamping effect of respective ends of leg support members acting against a wall support of a housing structure disposed at each end of the panel member. The leg support members are rectangular in cross-section and are virtually gripped on three side faces thereof by the housing structures in which they are pivoted, both in their extended, panel support position and their closed, storage position. A second panel member depending from and coplanar with the first panel member is surrounded by the leg members and provides a doubling of the reflective surface of the barricade.

Abstract: Our invention relates to a wheeled fertilizer or other granular material spreader which is pushed over the area or surface to be treated. The granular material is dropped through feed openings onto the surface to be treated, the metering of the granular material being accomplished by placing the metering blade in a desired position or positions depending upon what particular granular material is being discharged from the hopper.

Abstract: A powder dispersing device having an open ended container adapted to contain a powder, a diaphragm movable toward and away from the open end of the container whereby the powder is agitated and air is caused to flow into an annular outlet passage, there being venturi openings between the interior of the container and the outlet passage whereby the powder is sucked into the outlet passage and caused to flow outwardly therefrom in the form of a powder-in-air dispersion.

Abstract: Our invention relates to a wheeled fertilizer spreader which is pushed over the area which is to be fertilized or chemically treated and in which the fertilizer, chemical or other granular material is broadcast by being dropped onto a horizontal impeller which rotates on a vertical axis and throws the material outward horizontally in a frontal direction.