Patent GB-1067994-A (GB)
Title: Fluid powered vibrator
IPC: B06B1/18
Filed: 1964-04-17
Abstract: 1,067,994. Vibratory mechanisms. G. L. MALAN. April 17, 1964, No. 13941/64.. Heading F2X. A vaned cylindrically stepped rotor 35, adapted to freely roll inside a housing 21 of a vibrator for consolidating wet concrete, is formed in three parts namely, two end shoulders 39, 40 and a reduced central portion 41 which carries vanes (48, 49, 50) (Fig. 3, not shown). which together with a corresponding annular flange surface 25 of the housing form expansible air chambers. Air admitted and exhausted periodically behind the vanes, and to the expansible vane-chambers, causes the rotor to roll in an anticlockwise direction whilst rotating clockwise (Fig. 4). Each end face 31, 32 of the housing 21 has a central air inlet part 51 and concentric annular port 52 fed from a separate or common supply 54, and a concentric annular exhaust port 53. These housing ports periodically register with vane extending and expansible chamber inlet ports (75, 76, 77) and (60, 61, 62), Fig. 4 (not shown), in the end faces of the rotor, which latter communicate with ports (66, 67, 68) in the sides 42, 43 of the rotor shoulders 39, 40 adjacent the vanes (48, 49, 50) or in the surface 41 of the rotor. The vanes and chambers are exhausted by housing end port 53 periodically registering with rotor end ports (85, 86, 87) and (96, 97, 95) which latter lead to the sides 42, 43 of shoulders 39, 40. As shown in Fig. 4 (not shown), air enters via ports 51 (62, 68) the expansible chamber between vanes (50, 48) and via ports 52 (77) and 52 (75) to tend to extend vanes (50) and (48); vane (49) being exhausted via ports (86) and 53. Chamber inlet port (60) is about to register with port 51 and thus supply air to the chamber between vanes (48) and (49). After 60 degrees of rotation of rotor 35 the chamber between vanes 48 and 50 is still pressurized and that to the left of vane (48) is pressurized by air from ports 57 (60, 66), and to the left of the rotor and housing contact is exhausted by ports (102, 96) and 53. Vanes (48) and (50) are still extending whilst vane (49) is still exhausted. The rotor and housing surfaces 41 and 25 may be formed of an outer metal ring bonded on rubber. In a modification, Fig. 6 (not shown), a rotor (140) has three axially spaced vanes (164, 165, 166) engaging cylindrical metal rings (120, 121, 122) bonded to perforated rubber rings (123, 124, 125) on housing (111), the annular rotor shoulders (147, 148, 149) and (150) rolling on the inner housing wall. Air is continuously supplied through two axially extending rotor ducts (172, 174) from housing inlets (170, 171) to the rear of the vanes which have one-sided grooves (168, 169) extending to adjacent their outer tips (see Fig. 8, not shown) so that air pressure is supplied to one side of the vanes in the expansible chambers between surfaces (117, 118, 119) and (151, 152 and 153) on the housing and rotor. The opposite sides of the vanes are exhausted continuously through rotor ports (178, 179, 180) to the inner surfaces of the housing wall and out of the housing end (142). An end thrust equalizing pad (173) is provided. Vanes (164, 166) are in line with vane (165) angularly displaced by 195 degrees to prevent stalling of the rotor in a central position.