Abstract: A pneumatic conveyor for particulate material of low weight per piece comprises a separator formed by a cellular rotor with a filter wall adapted to separate the particulate material as the carrying air flows to the suction side of a blower. The pressure side of said blower is in communication with a conveyor duct communicating with the separator and having a threshold forcing part of the air upwards into the rotor so as to pass the filter wall in the opposite direction, thereby blowing the filter clean before the air contributes to the further conveyance of material through the duct.

Abstract: An implement for levelling the surface of an agricultural field, a so-called furrow-smoother, comprises a plurality of rings of rotary knives to throw the surface earth laterally away from the higher areas. The rings of knives are journalled in bearings which are suspended from a carrier frame by means of arms that extend below the bearings and substantially tangentially therefrom so as not to catch plant remains (straw, stem, and root material) carried along by the two knife rings sweeping on either side of the bearing arm.

Abstract: In a flexible tine harrow for the preparation of seed beds and comprising a plurality of individual harrow sections, each of these sections has an intermediate frame which is supported by earth crumbling drums in front of and behind the harrow section and is towingly connected with the main frame both through a link connection at the front end of the intermediate frame and through a telescopic stay biased to extension and arranged above the harrow section, the directions of the pull and push forces exerted through the link connection and the stay intersecting at a point approximately in the level of the shares of the harrow tines.

Abstract: In a resilient harrow tine of S-like shape and comprising a resilient hoop portion bent substantially to form a circle and having a cross-section the basic form of which is a rectangle with a ratio between the width and the height of approximately 3, the ratio between the strength and the material consumption has been optimized by designing the cross-section so that the neutral stress line is displaced in the direction towards the outwardly facing long side of the cross-section of the resilient hoop portion in relation to the longitudinal center line of the circumscribed rectangle of the cross-section.

Abstract: In a soil cultivating implement comprising a harrow with tines and a trailing bladed rotor for smoothing the furrowy nature of the field surface left behind the rear row of harrow tines, the blades of said rotor are arranged in groups with intermediate spaces aligned with the harrow tines of the rear row of tines. Each group comprises at least three rings of blades which all work the earth ridges left behind the harrow.

Abstract: In a centrifugal separator, in particular for separating light materials, such as grass seed, from an air flow, a whirl chamber is provided between a circumferential wall of the separator casing and a radially inner filter consisting of a louvred shell imparting a change of direction of about 180.degree. to the air flow on its way from the whirl chamber to the air outlet of the casing, thereby creating within the shell a counter-rotating whirl of air and material passed through the slits together with air.To separate such material from the air, the shell is provided with a vertically extending slot associated with an ejector rail adapted to remove the outer portions of the counter-rotating whirl and feed them back for renewed separation in the whirl chamber of the separator casing. The slits may then be given such a size that they will not be blocked up by the material or give rise to an increased loss of pressure, as the ejector rail provides for regaining the material passed through the slits.

Abstract: In an implement frame, particularly for an agricultural machine, comprising a central section and at least an end section or wing which is foldable between an extended operating position and a transport position substantially perpendicular thereto, the folding mechanism incorporates a first latch member for automatically arresting the end section in its extended position and a second latch member, associated with said first latch member, for automatically arresting the end section in its transport position.

Abstract: In a rotary earth crumbler having a central shaft (1) with mounting discs (2) fast thereon and an annular series of U-shaped resilient stirrups (3), the leg portions of these stirrups are formed with an outwardly convex curved section (12) which extends into a fixing slot (11) in the mounting disc and is then locked therein by deformation of parts of the slot borders below the mid portion of the curved section, thereby narrowing said slot. The locking may easily be released when needed, viz. by bringing the slot borders back to the original shape.