Improvements in or relating to grass-boxes for lawnmowers

Abstract: A lawnmower is provided with a detachable closed grass-box (10) for collecting the mown grass ejected through a grass outlet opening (20). The grass-box (10) comprises runner means (13) slidably engageable with guide means (14) for guiding the grass-box from an inoperative position clear of the opening (20) to an operative position co-operating with the opening.

Description: This invention relates to a grass-box arrangement for a lawnmower, particularly but not exclusively a power-driven rotary blade lawnmower. Rotary blade lawnmowers have been provided with various grass-box arrangements for collecting the mown grass in operation. Such grass-boxes have usually been positioned at the rear of the mower and connected to an outlet from the rotary blade housing. The rotary blade has been arranged so that not only does it cut the grass, but it creates an air flow through its housing and through the opening to carry cut grass into the grass-box. It has been usual to provide a hinged flap which may be moved from a position covering such an opening, when the grass-box is not in position, to a position out of the way when the grass-box is facing communication with the opening. Such a flap also allows the lawnmower to be used without the grass-box, by protecting the user from the flow of cuttings or other objects which would otherwise come out of the opening. Existing arrangements for such grass-boxes have been cumbersome in use and in particular the arrangements for positioning and attaching the grass-box on the mower have been difficult to use. It is an object of the present invention to alleviate these problems and to provide a grass-box arrangement which may be readily attached to and removed from a lawnmower for use. Both US-A-4,151,702 and US-A-4,326,370 disclose an arrangement in which a grass-box is at least partly supported by the handle of a lawnmower, the grass-box being disposed between two upwardly and rearwardly extending parallel members of the handle and being arranged to collect mown grass ejected through a grass outlet opening. According to the present invention such an arrangement is characterised in that the grass-box is a closed box supported on the top of handle at the front and rear by runner means slidably engageable with the parallel members of the handle such that the grass-box is slidable under its own weight from an inoperative position spaced a substantial distance from the opening to an operative position co-operating with the opening, the runner means being engaged with the parallel handle members by introducing the box between the said members from above and lowering it downwardly therebetween. Preferably, the grass-box is arranged to co-operate, when in its operative position, with a hinged flap provided to cover the outlet opening when the grass-box is not in place, to hold that flap in an open position clear of the outlet opening. Preferably, the grass-box has a rigid lid and the runner means from part of the lid. The lid may have suspended therefrom a bag of flexible material. Preferably such flexible material is porous and is preferably a woven fabric material. Preferably, such rigid lid member is provided with a wire rod frame arranged to support the flexible bag at least to form a mouth of the grass-box to co-operate with the outlet opening of the lawnmower. Preferably, the lid is provided with a handle by which the grass-box may be lifted and manoeuvred into and out of position from the lawnmower. In order to promote a fuller understanding of the above and other aspects of the invention, an embodiment will now be described, by way of example only, with reference to the accompanying drawings in which: Figure 1 is a part perspective view of a lawnmower showing a grass-box embodying the invention, Figure 2 is a schematic cross-sectional side view of the grass-box of Figure 1 taken on its centre line, Figure 3 is a scrap cross-sectional view on the line III-III of Figure 2, Figure 4 is a schematic cross-section taken on the line IV-IV of Figure 2, and Figure 5 is a half plan view of the grass-box of Figure 2. In the embodiment of-the invention shown in the drawings there is provided grass-box indicated generally at 10 comprising a fabric bag 11 carried on a rigid lid member 12. As shown in Figure 1 the lid 12 of the grass-box is provided with front and rear pairs of slide members 13b, 13a arranged to engage and slide on the side rails 14 of the handle structure of a rotary bladed lawnmower indicated generally at 15. Figures 2 and 5 show a side cross-sectional and a plan view respectively, of the grass-box 10 in its operative position on the lawnmower 15. The outlet opening of the lawnmower is indicated at 20 in Figure 2, and a flap 21 is hinged about an axis 22 on the body of the lawnmower to swing between a position shown in dotted outline at 23 covering the outlet opening, and an open position shown at 21 when the grass-box is in position. The flap 21 has side flanges 24 the edges of which engage the outer periphery of the outlet opening 20 in the closed position, so that even with the flap 21 in the closed position there is an outlet opening across the bottom of the flap indicated at 25. This enables the mower to be used effectively with an airflow out of the blade housing even with the flap in the closed position. The lid 12 of the grass-box is provided with a wire rod frame 30 which extends generally around the periphery of the lid 12 along the sides and rear edges, and branches away from the lid 12 around the pivot 22 with curved portions on either side, as indicated at 31, to a mouth-shaped portion 32 which corresponds in shape to the outlet opening 20 of the lawnmower. The frame 30 provides a support for the fabric bag 11 and forms in it a mouth to engage the outlet opening of the lawnmower. The fabric of the bag 11 is attached to the frame 30 by the formation of a suitable sleeve at the peripheral edge of the fabric bag. The frame 30 is attached in the lid 12 by means of four clamp plates 33 held in the structure of the lid by means of screws 34 as indicated particularly in Figure 3. The lid 12 which is preferably formed as a moulding of synthetic plastics material, is provided with a tongue 40 which engages beneath the edge of the flap 21 as at 41, to hold the flap in the open position shown in Figure 2. It can be seen that as soon as the bag is moved away from the outlet opening 20, in a direction to the right of Figure 2, the hinged lid 21 is free to fall down to its closed position A torsion spring arrangement, not shown, is provided to ensure that this happens, and a handle 42 is provided on the flap 21 so that a user may grip it to lift it to the open position on re-positioning the grass-box on the lawnmower. The lid 12 is as mentioned above formed with two pairs of slide members 13a, 13b which engage slide rails in the form of the handle side members 14, so that the grass-box may be positioned easily, as shown in Figure 1, with the bag portion having already passed between the side members 14, in a position clear of the outlet opening of the lawnmower, and with the hinge flap 21 being lifted up beyond the open position shown in Figure 2. It can be seen that if the grass-box is then released it will slide down the side members 14 from the initial position shown in Figure 1 into the operative position shown in Figures 2 and 5. This enables the grass-box to be put on the lawnmower very easily with a minimum of effort. The hinge flap 21 is then released and will drop down to engage the tongue 40 in its open position as shown in Figure 2. The grass-box lid 12 is provided with side tongues 50 which define between them an open space lying beneath the flap 21 in the operative position. The side tongues 50 also cover the front portions of the frame 30. Figure 3 shows one of the slide members 13 in a schematic cross-section. The member 13 comprises an extension of the moulding of the lid 12 forming a hollow arm 60 with a series of downward webs 61, the lower edges of which are shaped to engage on the upper surface of the members 14. This provides a relatively frictionless sliding action on the members 14 and allows the grass-box to slide freely under gravity into its operative position. The lid 12 is formed with a recess 70 and a handle 71 is positioned in that recess so that the user may grip it and lift the grass-box by it conveniently. The handle 71 is formed as a separate extrusion and located in apertures 72 formed in the end walls of the recess 70. The arrangement is such that the handle 71 can be slid into the apertures 72 from the front; and it is retained in position by means of an abutment 73 moulded in the lid 12 on the one hand, and a wedge shaped catch 74 moulded in the lid 12 on the other hand. The catch 74 is sufficiently resilient to deflect out of the way when the handle is being inserted. Thus it can be seen that the embodiment of the invention described provides a grass-box arrangement which is simple and convenient to use.

Claims: A lawnmower comprising a handle for manoeuvring the mower (15) over the ground and a grass-box (10) disposed between two upwardly and rearwardly extending parallel members (14) of the handle for collecting mown grass ejected through a grass outlet opening (20), characterised in that the grass-box (10) is a closed box supported on top of the handle at the front and rear by runner means slidably engageable with the parallel members (14) of the handle such that the grass-box is slidable under its own weight from an inoperative position spaced a substantial distance from the opening (20) to an operative position co-operating with the opening, the runner means being engaged with the parallel handle members (14) by introducing the grass-box between the said members from above and lowering it downwardly therebetween. A lawnmower according to claim 1 in which the grass-box has a rigid lid (12), and the runner means form part of the lid. A lawnmower according to claim 1 or claim 2 wherein a hinged flap (21) covers the outlet opening (20), and wherein the grass-box (10) co-operates with the flap (21) to retain the flap in an open position clear of the opening (20) only when the grass-box is in its operative position with respect to the opening. A lawnmower according to claim 3 in which the lid (12) of the grass-box is recessed to accommodate the flap (21) in its open position, the flap being retained in its open position by a detent (40) projecting into the recess. A lawnmower according to any one of the claims 2-4 wherein the grass-box (10) further comprises a flexible bag (11) suspended from a wire rod frame (30) secured to the lid (12), the frame (30) forming a mouth (32) of the grass-box adapted to co-operate with the outlet opening (20). A lawnmower according to any one of the claims 2-5 wherein the lid (12) is provided with a handle (71) for lifting and manoeuvring the grass-box (10) into and out of a position in which the runner means (13a, 13b) engage the parallel handle members (14).

Inventors: GRAY PHILIP C O ROBERTS WEAVER, WILLIAMS STEPHEN C O ROBERTS W, GRAY, PHILIP C/O ROBERTS WEAVER,, WILLIAMS, STEPHEN C/O ROBERTS WEAVER,
Applicants: ATCO QUALCAST LTD, ATCO-QUALCAST LIMITED
Application year: 1990
Main classification: A01D34
IPC codes: A01D34, A01D43