SPRAY MASKS AND LINE MARKERS

摘要

A line-marking apparatus, comprises a pair of primary wheels 58, 60; a pair of stabilizer wheels 106 each attached to and separately moveable with respect to the apparatus between laterally extended and closed positions; a mask 10 comprising an edge 22, 24 for defining the shape of marking fluid when sprayed on a surface; a threaded shaft 64 by which the mask is adjustably mounted in the apparatus; ducting 72 and battery-powered air impellers 74 mounted at a hub region of the primary wheel to provide an air flow at said shape-defining edge, which air-flow is arranged to direct sprayed marking fluid material from the shape- defining edge and within the marking fluid sprayed on the surface; a holder 41 in which an aerosol canister 108 is movably mountable, spring means 123 operative between the aerosol canister and the holder, the spring means being biased to complement the action of the aerosol outlet valve spring; and an outlet valve opening mechanism 120, 124 acting with mechanical advantage on the aerosol canister in opposition to the spring means. The holder 41 may be set at different heights by a button 52 selectively engageable in one of a series of vertically spaced apertures.