LAWN VACUUM CLEANER FOR CUTTING AND OTHER DIRT FROM THE FLOOR.

Abstract

The present invention relates to a lawn vacuum cleaner mainly characterized by the fact that the turbine cage has a cylindrical section or at most a spiral section with 2 centers and by the fact that the grass receiving box has an external air intake that can be connected to the exhaust pipe of the carrier tractor.

Description

The present invention relates to a lawn and leaf vacuum cleaner. It is attached to the patent application filed on 08 / 22 / 1986 under number 8612263 in the name of Charpenet Louis Joseph, under the title: "Vacuum cleaner for cut grass and other dirt from the soZ". Such a machine is essentially composed of a hood equipped with an emptying hatch and fed by a centrifugal vacuum cleaner, also called a turbine, which sucks up the grass at the very exit of the mower, via a reception box. located at the mower's discharge point and connected to the vacuum cleaner by a suitable duct. Unfortunately, Ze operation of this type of device is often unpleasantly stopped by untimely jams both at the level of the vacuum cleaner itself, and at the level of the reception box at the exit of the mower. The object of the present invention is to add to the improvements already described in the main patent to which it relates. In the devices produced to date, the vacuum cleaner cage has a conventional spiral section with at least three centers. This results in a gradual increase in the distance from the internal wall of the spiral to the volume occupied by the cylinder of revolution of the rotor. This displacement creates a truncated crescent-shaped Zibre volume not swept by the rotor blades and where the turf will frequently clump, especially when it is Zong and wet. In the present invention, Ze pluseur Ze rôZe of the fan is significantly improved by using a cage of cylindrical section. The four walls of the outlet duct are on the one hand naturally for two faces, in the lateral planes of the fan, on the other hand for the third in a plane tangent to the cylinder, the fourth face being in a secant plane, parallel to the pZan tangent used. If this device slightly reduces the efficiency of the device in terms of volume of air sucked in, iZ practically completely eliminates the risk of formation of bread by the agglomeration of grass between the spiral of the fan and its rotor, this space being reduced to its minimum. When the device is coupled to a mower with a large cutting capacity, therefore with intense production of cut grass, it may be necessary to have a fan outlet duct with a section greater than that permitted by the use of the a cylindrical cage vacuum cleaner. In this case, a spiral cage vacuum cleaner will be used with two centers and no longer with three or four centers as is usually practiced. These two centers, near Z'un de Z'autre, are then located in the plane parallel to the tangent plane and to the secant plane of the walls of the ejection duct. Thus the blades of the rotor will only begin to move away from the spiral of the cage 900 before the birth of the outlet duct. The volume not swept by the blades is then reduced to a minimum and Ze risk of formation of bread inside the fan is very weak. Another frdquent place of agglomeration of the lawn is located at the very exit of the mower in Ze reception box. This one in the known technique, for the apparatuses of a certain power, is manufactured in black tôZe. This product has Z' disadvantage of a relatively high coefficient of adhesion and which increases with Ze time because iZ oxidizes and this all the more quickly that Ze grass is a particularly corrosive material. In the present invention, this reception box is made of stainless steel, a material with a better coefficient of friction and whose polish will not deteriorate over time. During mowing, the cut grass is thrown with force by the propellers of the mower against the opposite wall of the receiving box. In the known technique, no device is provided to reduce the impact of the grass against this wall. And in wet grass, sticking is frequent. The present invention considerably reduces this risk by providing one or more side air intakes oriented at the birth of this wall. This or these air intakes are external to the outlet section of the mower and the air sucked in through there is therefore uncharged air. rapid air current free of all solid particles the Zong of the wall, thus effectively protecting it from Z'impact of the lawn. The orientation of the flow can - be obtained either by the addition of a deflecting wall inside the box, or by a system of shutters, or by any other similar system. Naturally the communication itself of tele orifices with the outside can be done through any wall of the reception box, either from the front, on the mower side, or from above, or even through the very wall to be protected. in all cases, this device must lead to a flow of air or gas oriented along this wall. The risks of adhesion are thus greatly reduced. When the grass is Zong, abundant and wet, the present invention further improves the system by connecting at least one of these orifices to the muffler of the carrier tractor. This causes an acceleration of the gas flow propagating at high speed along the Zong of the wall where the grass is protected. Due to the high temperature of the exhaust gases, it also and above all causes partial drying and instantaneous ZocaZ of the lawn: two actions which add up to practically eliminate any risk of clogging. Naturally, this last and effective additive will only be used on very damp grass. In the following, the invention is described in more detail in its characteristics and in its advantages. The following description and drawings represent non-limiting embodiments of the invention. Figure 1 shows a sectional view of a cylindrical cage type lawn vacuum fan. Figure 2 shows the same ventiZateur but with spiraZe cage has two centers. FIG. 3 represents a cross-sectional view of a turf reception box provided with a side air intake. Figure 4 shows this same box with a side air intake equipped with a flexible metal pipe connected to the exhaust pipe of the tractor. Figure 1 shows a sectional view of a cylindrical cage fan. The cage I of the fan has a cylindrical section with a single center 2. The disc of the rotor 3 provided with the blades 4 baZaie the whole of the internal volume of the fan. The outer wall 5 of the ejection duct is tangent at a to the cylinder of revolution of the cage. We see that this device, if it somewhat limits the volume of air sucked in, leaves no room for the formation of bread. Figure 2 shows a sectional view of a 2-center scroll fan. When the mower has a large cutting capacity and Ze grass is abundant, it is necessary to have a large section ejection duct by limiting the volume Zaissd Ziber as much as possible by the rotor inside the fan. The cage 6 of the rotor will be at spiraZe has 2 centers. Center 7 defines the cage of b a c under radius r, Ze center 8 defines it of c a d, Z'arc c d, measuring 90 , under Ze radius R (R > r). d is Ze tangent point of the wall 9 of the ejection duct. The centers 7 and 8 are in a plane parallel to this wall 9. Thus the section of the ejection duct will be increased while completely sweeping by the rotor 10 the part between b and c of the fan cage and limiting to a minimum a 900 the crescent-shaped unswept portion between c and d. The formation of bread inside the spiral is practically impossible, which is not the case in a classic 3 or 4 center fan. Figure 3 shows a sectional view of the turf recovery box at the exit of the mower. The trunk 11 placed at the outlet 12 of the mower has an air intake 13 before the side outside the mower. This air intake is, in the example, located, on the outside, on the front of the boot on the mower side. It could just as well be provided on top of the safe giving into the chamber defined by the walls 14 and 15, it could also be provided in the wall 15 itself. This air intake thanks to the inner wall 14 directs the unloaded gas flow along the wall 15 thus reducing the impact of the grass on this wall and facilitating its orientation and its evacuation towards the ventiZator. Figure 4 shows this same reception box which has been connected Z'orifice 13 to the exhaust pipe of the tractor by the flexible metal pipe 16. A slide system 17 allows quick installation and removal of this device that Z'on will use only in very wet grass. This results in an acceleration of the gas flow along the wall 15 and instantaneous drying and ZocaZ of the grass in contact with the hot exhaust gases. The risk of jamming then becomes practically non-existent.

Claims

DEMANDS 1) A lawn and leaf vacuum cleaner according to claim 1 of the main patent, equipped with a fan supply duct connected to the mower by a receiving box, characterized in that the receiving box has an external air intake oriented perpendicular to the direction of travel and located at the front of the mower housing and therefore upstream of the grass penetration zone, the air thus collected by the orifice 13 being directed towards the wall 15 by an internal wall 14. 2) Device according to claim 1 of this certificate of addition characterized in that the orifice 13 of the receiving box is connected by conduit 16 to the exhaust pipe of the tractor so that the exhaust gases flowing from the wall 15 prevent any aggiormation of the turf on this wall thanks to the directed and localized hot gas flow which ran through it. 3) Grass and leaf vacuum cleaner according to claims 1 or 2 of this certificate of addition characterized in that, on the receiving box, the orifice 13 outside the outlet section of the mower, whatever its position on the receiving box, is provided with a cross-section significantly smaller than the cross-section of the suction orifice, or orifice of the receiving box through which the product sucked up by the fan flows, so as to cause the wall 15 to produce a rapid current of air, or gas, free from all solid particles, effectively protecting it from the impact of the grass.