Abstract: A salt water chlorinator (30) for a swimming pool includes an electrolysis cell having two anodes (98) and a cathode (94). Two scrapers (102), each of which is of titanium and includes scraping portions in the form of ribs (106) in contact with the opposite surfaces of the cathode, are reciprocated relative to the cathode (94) to remove scale deposits from the cathode (94). The scrapers (102) are mounted in a frame (110) and their scraping ribs (106) are curved such that the ribs (106) are self-biased against the cathode surfaces. A mechanism for reciprocating the scrapers (102) includes two solenoid coils (116) which act on cores (114) in a stem (112) of the frame (110). A control circuit for the electrolysis cell is contained in a housing (86) which is attached to a housing (82) for the electrolysis cell. The control circuit includes a flow sensor for sensing salt-water flow through the electrolysis cell.

Abstract: A salt water chlorinator (30) for a swimming pool includes an electrolysis cell having two anodes (98) and a cathode (94). Two scrapers (102), each of which is of titanium and includes scraping portions in the form of ribs (106) in contact with the opposite surfaces of the cathode, are reciprocated relative to the cathode (94) to remove scale deposits from the cathode (94). The scrapers (102) are mounted in a frame (110) and their scraping ribs (106) are curved such that the ribs (106) are self-biased against the cathode surfaces. A mechanism for reciprocating the scrapers (102) includes two solenoid coils (116) which act on cores (114) in a stem (112) of the frame (110). A control circuit for the electrolysis cell is contained in a housing (86) which is attached to a housing (82) for the electrolysis cell. The control circuit includes a flow sensor for sensing salt-water flow through the electrolysis cell.

Abstract: A multi-impeller arrangement and to a pump having the impeller arrangement. The impeller arrangement or impeller cluster includes at least two impellers, each impeller having an annular back plate and an annular front plate. The impellers are releasably secured together in an axially in-line series having the front plate of a first impeller at one end and the back plate of a second impeller at the other end. The second impeller includes an axial projection which extends from its back plate, through and beyond its front plate to the first impeller. The first impeller is engaged with the projection of the second impeller such that all impellers are rotatable as an assembly.

Abstract: The present invention relates to an improved multi-impeller arrangement and to a pump having the impeller arrangement. The impeller arrangement or impeller cluster includes at least two impellers, each impeller having an annular back plate and an annular front plate. The impellers are releasably secured together in an axially in-line series having the front plate of a first impeller at one end and the back plate of a second impeller at the other end. The second impeller includes an axial projection which extends from its back plate, through and beyond its front plate to the first impeller. The first impeller is engaged with the projection of the second impeller such that all impellers are rotatable as an assembly.

Abstract: A fluid pump of the type in which a housing assembly has a first sub-housing having an electric motor therein which is in line with a second sub-housing having the impeller therein, with the motor having a rotor shaft which extends through a seal of the first sub-housing into the second sub-housing and with the impeller mounted on the rotor shaft so as to be rotatable by the motor, and the second sub-housing having inlet and outlet ports through which fluid, such as water, is able to be pumped through the second sub-housing.

Abstract: An impeller assembly includes an impeller which has a pair of plate means adapted for individual connection to a drive shaft for rotation by the drive shaft about an axis, and vane means disposed intermediate the pair of plate means and adapted for rotation with the pair of plate means. The impeller assembly further includes means for applying force parallel to the axis of the impeller to the impeller so as to clamp the pair of plate means and intermediate vane means together.

Abstract: A fluid pump (10) with a first sub-housing (12) having an electric motor (14) therein which is in line with a second sub-housing (16) having an impeller (18) therein, with the motor (14) having a rotor shaft (20) which extends through a seal (74) of the first sub-housing (12) into the second sub-housing (16), with the impeller (18) mounted on the rotor shaft (20) so as to be rotatable by the motor (14), and the second sub-housing (16) having inlet and outlet ports (81, 83). Impeller (18) has first and second annular plates (62, 64) which are axially spaced, an angularly spaced, from the inner periphery of the first annular plate (62) and by which the impeller (18) is mountable on the shaft (20) for rotation therewith. The impeller (18) further includes a plurality of circumferentially spaced connectors (70) which extend between the first annular plate (62) and an outer peripheral surface of the hub (68) and which secure the hub (68) in relation to the first plate (62).

Abstract: A moulded plastics clamp (14) for attaching strap (16) of a lumbar support to an upright of a seat for a vehicle comprises two portions (20, 22) reinforced by ribs (52-53) and integrally joined by flexible portion (24). To engage clamp (14), portion (24) is flexed so that ridged concave sections (26, 28) enclose and contactthe upright, projection (60) being received in a hole therein. During engagement, surfaces (34, 36) on extension sections (30, 32) are guided into proximity, if not contact, by engagement of complementary tapering webs (42) and recesses (44) so that apertures (38, 40) align to receive a bolt to tighten clamp (14). Extension section (30) includes flanges (50) between which section (32) locates to prevent relative lateral movement between sections (30, 32).

Abstract: An impeller assembly includes an impeller (10), the impeller (10) having a pair of plate means (12, 14) adapted for individual connection to a drive shaft for rotation by the drive shaft about an axis and vane means (15) disposed intermediate the pair of plate means (12, 14) and adapted for rotation with the pair of plate means (12, 14). The impeller assembly further includes means for applying force parallel to the axis of the impeller (10) to the impeller (10) so as to clamp the pair of plate means (12, 14) and intermediate vane means (15) together.

Abstract: An adjustable headrest for a seat backrest having a mounting system includes a frame structure adapted to be secured on the mounting system for up and down movement relative to the seat backrest. The headrest also includes a drive mechanism having a height adjustment drive system for controlling height adjustment of the headrest by moving a height adjuster section, and a fore/aft adjustment drive system for controlling fore/aft adjustment by moving the fore/aft adjuster section. The fore/aft drive system has an adjustment member constrained to up and down movement, and the adjustment member is engaged with the adjuster section so as to permit for/aft movement of the adjuster section relative to the adjuster section and the adjustment member.

Abstract: An actuator for adjustment of a flexible line such as a cable or rope. The actuator includes a screw threaded spindle and a cooperatively engaging adjustment member having a nut with an internal screw thread that is in threaded engagement with an external screw thread of the spindle. The adjustment member is rotatable relative to the spindle to cause axial movement of the spindle. A turning block or pulley is mounted on an end of the spindle for rotation on an axis extending transversely with respect to the axis of the spindle and the flexible line is retained in relation to the spindle. The flexible line is passed around the turning block or pulley for adjustment of the flexible line by axial movement of the spindle.

Abstract: Adjustable headrest (201) for a seat backrest having a mounting system (148, 149) includes frame structure (207) adapted to be secured on the mounting system (148, 149) for up and down movement relative to the seat backrest. Headrest (201) also includes drive means (120, 130) having height adjustment drive system (121-123, 125) for controlling height adjustment of headrest (201) by moving height adjuster section (114), and fore/aft adjustment drive system (131-134) for controlling fore/aft adjustment by moving the fore/aft adjuster section (115). Fore/aft drive system (131-134) has adjustment member or nut (132) constrained to up and down movement, and nut (132) is engaged with adjuster section (115) so as to permit fore/aft movement of adjuster section (115) relative to adjuster section (114) and adjustment nut (132).

Abstract: A lumbar support adjustment device is disclosed comprising a bracket (11) adapted to slidably restrain a lumbar support belt means (13) adapted to extend between first (12) and second (12') side frames of a seat, said bracket being adapted to be secured to the first side frame and having associated cam means (16) operable to slidably move said belt means between a first and a second position to provide lumbar support adjustment in which said cam means cooperates directly with cam follower means formed in or on said belt means.

Abstract: An adjustable lumbar support which includes an elongate flexible band arranged to extend between and be connected to opposite sides of a seat back rest. The connection with the seat back rest and least one end of the band is such that the end of the band is movable in the longitudinal direction of the band relative to the seat back rest so as to vary the degree to which the band curves rearwardly. Control of that movement is effected through a flexible cable connected to the band at one end and connected to an actuator at its opposite end. The cable has a tubular cover and a wire core slidable longitudinally within the cover, and the cable connections are such that the wire core forms a static part of a drive connection between the band and the actuator, and the cable cover forms a dynamic part of that connection. It is preferred that a respective cable is connected to each end of the band, and that each of those cables is connected to a common actuator.

Abstract: An adjustable lumbar support (1) for the back rest (3) of a seat is disclosed which is formed from a band which extends longitudinally across the back rest, and which supports a plurality of convex shaped support elements (10). The band incorporates regions (4, 5) which extend in the longitudinal direction of the band and there are actuators (7) for varying the effective length of at least one of the regions. Adjustment of the support (1) is effected by changing the relationship between the effective lengths of the regions causing the support elements (10) to tilt.

Abstract: An adjustable lumbar support for use in the backrest of a seat, the lumbar support having an elongate flexible band which extends longitudinally between the sides of the seat backrest and which has an effective length capable of variation so as to thereby vary the rearward curvature of the band when the lumbar support is in use. The band includes two parts which overlap in a region intermediate the length of the band and which are interconnected through a drive device including a rotatable cam. The cam interacts with the band parts in such a way that rotation of the cam causes a change in the degree of overlap between those parts and thereby changes the effective length of the band. The cam is contained in a housing and an actuator such as an electric motor can be mounted on that housing to form an integral part of the lumbar support assembly.