Abstract: A walk-behind sweeper has at least one sweeping roller and an air-cooled drive motor having a drive shaft and driving in rotation the at least one sweeping roller. At least one fan wheel conveys cooling air to the drive motor wherein the at least one fan wheel is driven by the drive shaft. A dirt collecting chamber is provided into which swept-up material that is swept up by the at least one sweeping roller is conveyed. The at least one fan wheel has an intake side connected by a flow connection to a working area of the sweeper so that at least a portion of the cooling air stream for the drive motor is taken in from the working area of the sweeper.

Abstract: A device for supplying water to a cutting wheel of a hand-held cut-off machine has a water-conducting line and a valve arrangement arranged in the line. The valve arrangement has a shut-off valve for controlling the water flow flowing through the line. The shut-off valve is actuated as a function of an operating signal of the cut-off machine such that in operation of the cut-off machine the water flow through the line is released by the shut-off valve. The shut-off valve interrupts the water flow through the line when the operating signal is absent.

Abstract: A manually guided apparatus for collecting objects, especially fruits and nuts, including a pick-up drum rotatably mounted in the drum chamber of a housing. The drum is disposed approximately transverse to the direction of operation, and is rotationally driven by a drive unit. The housing has a wall section extending over the width of the drum approximately at the level of the outer diameter thereof. A ground support is disposed in the region of ends of the drum. A collection channel provides communication for picked-up objects between the drum chamber and a collection receptacle for receiving the objects. The wall section of the housing and the drum cooperate with one another such that objects are accelerated along the wall section toward the collection channel and are ejected out of the drum chamber along a trajectory into the collection receptacle. A handle is operatively connected to the housing for moving the housing in the direction of operation.

Abstract: A vacuum arrangement has a vacuum pipe having a vacuum opening facing a ground surface and adapted to pick up from the ground surface a material to be collected. The vacuum pipe conveys the material to be collected into a collecting container connected to the vacuum pipe. The vacuum pipe has a working area located within the area of the vacuum opening. At least one blower nozzle having a blower air exit is arranged such that a blower air flow exiting from the blower air exit is directed onto the ground surface into the working area. The blower air exit and the vacuum opening are positioned at a spacing relative to one another.

Abstract: A saw chain for a power chain saw is provided and comprises drive links and side links that connect them, whereby alternatingly disposed on one and the other longitudinal side of drive links, in place of a side link, are a cutter link and a leading safety link. The cutter link has a cutter tooth and a leading depth limiter, whereby the safety link is provided with a projecting nose for support against the base of a cut. The nose extends in the direction toward the depth limiter. The safety link is provided with a side portion disposed in front of the nose. The side portion has an elevated contact surface, which, when the saw chain is curved in the reversing region, is disposed on the path of a top cutting edge of the cutter tooth, and when the saw chain is extended reaches at least nearly to the height of the depth limiter.

Abstract: A saw chain for a motor-driven chain saw (1) is formed from center drive links (10) and lateral connecting links (11). A first radius (18) is the maximum distance of the axis (22) of the leading rivet opening (12) to the region (19) facing toward the forward running surface and lying in the running direction. A second radius (20) defines the maximum distance from the axis (23) of the trailing rivet opening (13) of the connecting link (11), which is next adjacent in the running direction (8), to the region (21) of the connecting link (11). The region (21) lies facing toward the rearward running surface (17) opposite to the running direction (8). The second radius (20) is greater than the first radius (18) and the sum of first radius (18) and second radius (20) corresponds approximately to the distance (b) of the axes (26, 27) of the rivet openings (24, 25) of a drive link (10) arranged between the connecting links (11).

Abstract: The invention is directed to a guide bar for a motor-driven chain saw (1) and includes a longitudinally extending flat base body (2) having a peripherally extending guide groove (3) for guiding a saw chain (4). In the region of the direction-changing section (12) of the guide bar (13), the saw chain (4) is partially laterally covered by guide discs (14, 14′), which rotate along with the idler sprocket (16). The guide discs (14, 14′) include radially projecting sections (18) whose number is identical with the number of the teeth (17) of the idler sprocket (16). The tendency to kickback of the motor-driven chain saw is reduced with these constructive measures.

Abstract: A guide bar (1) is provided for a portable handheld work apparatus, such as a motor-driven chain saw or overhead branch cutter, and includes an elongated, flat base body (4) having a peripherally extending guide groove for guiding a saw chain (6). In the region of the direction-changing section (14) at the free tip (13) of the guide bar (1), the saw chain (6) is laterally partially covered by guide discs (17, 18) which rotate with the idler sprocket (19). The guide discs (17, 18) include radially projecting sections (20, 20′). Corresponding radially projecting sections (20) of one guide disc (17) are arranged offset relative to the radially projecting sections (20′) of the other guide disc (18). With this constructive measure, the manipulation of the portable handheld work apparatus is improved.

Abstract: A saw chain for a power chain saw is provided and comprises drive links and side links that connect them, whereby alternatingly disposed on one and the other longitudinal side of drive links, in place of a side link, are a cutter link and a leading safety link. The cutter link has a cutter tooth and a leading depth limiter, whereby the safety link is provided with a projecting nose for support against the base of a cut. The nose extends in the direction toward the depth limiter. The safety link is provided with a side portion disposed in front of the nose. The side portion has an elevated contact surface, which, when the saw chain is curved in the reversing region, is disposed on the path of a top cutting edge of the cutter tooth, and when the saw chain is extended reaches at least nearly to the height of the depth limiter.

Abstract: A saw chain for a motor-driven chain saw (1), including for a harvester for the lumber industry, is formed from center drive links (10) and lateral connecting links (11). The drive links (10) and the connecting links (11) are pivotally connected to each other via rivets (9). The connecting links (11) are configured, in part, as cutting links (14). These cutting links include a cutting tooth (15) and a forward running surface (16) and a rearward running surface (17). The forward running surface (16) is approximately at the elevation of the leading rivet opening (12) and the rearward running surface (17) is approximately at the elevation of the trailing rivet opening (13). The rearward running surface (17) is configured extended in a direction opposite to the running direction (8) of the saw chain (5). A first radius (18) is the maximum distance of the axis (22) of the leading rivet opening (12) to the region (19) facing toward the forward running surface and lying in the running direction.

Abstract: A guide bar (1) is provided for a portable handheld work apparatus, such as a motor-driven chain saw or overhead branch cutter, and includes an elongated, flat base body (4) having a peripherally extending guide groove for guiding a saw chain (6). In the region of the direction-changing section (14) at the free tip (13) of the guide bar (1), the saw chain (6) is laterally partially covered by guide discs (17, 18) which rotate with the idler sprocket (19). The guide discs (17, 18) include radially projecting sections (20, 20′). Corresponding radially projecting sections (20) of one guide disc (17) are arranged offset relative to the radially projecting sections (20′) of the other guide disc (18). With this constructive measure, the manipulation of the portable handheld work apparatus is improved.

Abstract: The invention is directed to a guide bar for a motor-driven chain saw (1) and includes a longitudinally extending flat base body (2) having a peripherally extending guide groove (3) for guiding a saw chain (4). In the region of the direction-changing section (12) of the guide bar (13), the saw chain (4) is partially laterally covered by guide discs (14, 14′), which rotate along with the idler sprocket (16). The guide discs (14, 14′) include radially projecting sections (18) whose number is identical with the number of the teeth (17) of the idler sprocket (16). The tendency to kickback of the motor-driven chain saw is reduced with these constructive measures.

Abstract: The invention relates to a double-barrelled tube with a respiratory (11) and an inhaling (12) passage for the mechanically controllable respiration of a patient in which the inhaling passage connected to a respiratory gas source is fitted at the distal outlet with a nozzle directed towards the distal outlet aperture of the respiratory passage. The respiratory passage is connected at the proximal outlet with an exhalation valve (60) which can be opened and closed by means of an electrical control device. The electrical control device is connected to an electrocardiograph or a blood pressure measuring instrument so that respiration may be effected synchronously with the pulse rate using the respiratory gas fed to the inhalation passage with a retrograde flow of respiratory gas. Inhalation may take place in either the systole or the diastole.