Abstract: A filter system includes a designated filter element including a geometric projection thereon and a filter element housing including an opening keyed to the geometric projection. The opening comprises a recess, a channel or a slot and the recess, the channel, or the slot includes a rib. The geometric projection engages the opening when the designated filter element is installed in the filter element housing, and the filter element housing includes a filter housing body and a filter housing cover.

Abstract: A filter system including a designated filter element including a geometric projection thereon and a filter element housing including an opening keyed to the geometric projection. The geometric projection engages the opening when the designated filter element is installed in the filter element housing. The opening, which may comprise a channel or slot, and the geometric projection may possess a variety of different shapes.

Abstract: The disclosed embodiments relate to simulation of multiple PLCs which are to be physically implemented in a networked or otherwise coordinated manner, such as to control various industrial machines and/or implement multiple steps used in performing an industrial process. Each simulated PLC 114 is throttled relative to each of the other simulated PLCs 114 by use of a common simulated clock 116. The physical characteristics of the particular PLC being simulated are used to ensure that each PLC's behavior is consistent with the physical characteristics of the other PLCs being simulated, e.g. relative to the time elapsed by the common simulated clock 116. Accordingly, simulation of a PLC having physical characteristics different from one or more of the other PLCs will reflect the differences and provide a more accurate representation of the expected actual operation thereof.

Abstract: A wheelbarrow incorporates an electric motor and mechanical drive coupling such that motorized assistance is provided to the wheelbarrow when required. Typically a sustained switch is provided such that drive to a wheel only occurs when required.

Abstract: Ground injection, eg, aeration, apparatus adapted to be mounted on or drawn by a tractor and comprising one or more tines (12) reciprocated vertically by a crank (13) and crank shaft (13a) driven from a motor (14). Each tine (12) defines an internal passage (27) with outlet apertures (26). A compressor (24) connected to the passage (27) by a duct (23) having a poppet valve (21) actuated by a cam disc (19) on the crank shaft (13a) delivers a pulse of air to be injected into the ground through outlet apertures (26) at the position of maximum penetration of the ground by each tine (12). Instead of air, a liquid, a powder, or other gaseous substance may be injected into the ground where it is penetrated by each tine. The apparatus may include two or more rows of such tines and associated injection means.

Abstract: A spray device is provided in which a spray stem section is secured within a passage of a spray device body. The stem section is readily removable to allow easy cleaning and also is normally made of materials which allow disposal after use of the stem section. In order to allow such use of plastics materials, in particular the stem section is associated with the passage such that seal elements isolate feed ports over a relatively broad communication band to gutter channels in the stem section. Normally a nozzle combination is secured within a jet such that this combination is also separately disposable. The nozzle combination is held within the spray stem section using a spray hood.

Abstract: A reel (10), particularly for an electric cable (12), has a rotatable drum (14) supported at (16) and optionally swivel-mounted on a plinth (30) or other member. A removable motor module (60) can be attached to convert the drum to a motorized reel controlled by a switch (82), which allows the user to rewind the cable (12) onto the drum (14), when required.

Abstract: Ground injection, e.g. aeration, apparatus adapted to be mounted on or drawn by a tractor and comprising one or more tines (12) reciprocated vertically by a crank (13) and crank shaft (13a) driven from a motor (14). Each tine (12) defines an internal passage (27) with outlet apertures (28). A piston rod (19) connected to each tine and to a cylinder (21) has a piston (20) which forces air into a reservoir (23) and via a line (25) into the passage (27). The mechanism is timed such that a pulse of air is injected into the ground through outlet apertures (28) at the position of maximum penetration of the ground by each tine (12). Instead of air, a liquid or other gaseous substance may be injected into the ground where it is penetrated by each tine. The apparatus may include two or more rows of such tines and associated injection means.

Abstract: A reel (10) for cable (21) has a drum (24) onto which the cable (21) may be wound. An electric motor (41) can turn the drum (24) to pull cable (21) in but the drum (24) can also pivot at (65) when the cable (21) is pulled or released. This rocking motion is sensed to switch the motor (41) on or off, thereby allowing slack cable (21) always to be taken up, but preventing the motor (41) resisting cable (21) paying out when required.

Abstract: A device (10) allows forward (clockwise) rotation of a shaft (12) but prevents reverse rotation unless disengaged. A loop (20) is attached at one end to a slide show (16), passes round a drum (14) on the shaft (12), around a first pin (24) and a second pin (26), to an arm (28). The arm (28) can move clockwise to slacken the loop (20) to disengage the device (10) and allow rotation of the shaft (12) in either sense. A mechanism for controlling the arm (12) and for self-tightening the loop (20) is described.

Abstract: The invention relates to an anti-roll back device of particular applicability to motor vehicles but which can be applied to any rotating member where in ordinary useage the rotatable member is required to be rotated in one direction and prevented from rotating in the opposite direction but which has the further capability of being activated to permit the rotation in the opposite direction as and when it is required.

Abstract: An anti-roll back device for vehicles is of the general type where a loop or noose is caused to tighten on a drive shaft or a brakedrum on the drive shaft when the drive shaft attempts to make unwanted reverse rotation. To improve on this construction, we propose a construction where the loop or noose extends around a cranked member pivotally mounted in closely spaced relationship to the drive shaft or brake drum, and an arrangement to pivot the cranked member between a first position where the loop or noose can engage the drive shaft or brake drum and prevent the opposite rotation, and a second position to render the loop or noose inoperative during any period where the drive shaft or brake drum is positively required to be rotated in the reverse direction and there being further structure to hold the crank in its second position until the drive shaft or brake drum has ceased rotating in the reverse direction.