DE1244457B - Motor-driven lawn mower with horizontally rotating blade - Google Patents

Description

GERMAN WPTWl PATENT OFFICE

EDITORIAL

German class: 45 c -35/26

Number: 1244 457

File number: Z 9839 III / 45 c

1 244 45T filing date: January 4, 1963

Opened on: July 13, 1967

The invention relates to a motor-driven lawnmower with a horizontally rotating Knife in a housing open at the bottom.

Various arrangements have become known for setting the cutting height in lawnmowers.

In most cases this is done by adjusting the running wheels or a roller. Here must the engine switched off, nuts and bolts loosened, levers adjusted and sometimes the wheels completely unscrewed. In a known embodiment, the impellers are directed to one side Fastened slots. The individual cutting heights are very far apart. The required Thickness of the wheel studs does not allow a narrower graduation here, because otherwise the intermediate webs will close get weak. In another construction, the impellers are driven by an elaborate mechanism coupled and adjusted together by a lever. However, this is expensive and has the Disadvantage that adheres to all constructions in which the wheels are adjusted, that the knife housing is more or less lifted off the ground. This makes it easy to do with your foot to get under the knife housing. In many cases this is due to contact with the running mower blade or serious injuries were caused by stones being thrown out. In contrast, the knife housing Mowing tall lawns is problematic. It is Also cumbersome to unscrew the mower blade to change the cutting height and add spacers or take off. There is also the risk that when installing the knife or the The impellers on the tipped lawnmower. Hands get injured by the knife, especially when the motor accidentally switched on or by. Rotation of the knife is started again.

All arrangements also have the disadvantage that there are screws, nuts and other locks can solve by vibration. Likewise, the jamming and rusting of guides, Levers, bolts and screw connections cannot be ruled out. Most of the listed disadvantages also shows another known adjusting device for changing the cutting height, at which supports with recesses come into use, through which wing screws are passed.

If individual running wheels on lawnmowers are accidentally locked in different height positions, this will result in an uneven or gradual cut. The unattractive looking, too deeply mowed strips can then only be balanced with a motor-driven lawnmower
horizontally rotating knife

Applicant:

Ernst Zimlich ₅ Munich 15, Kolpingstr. 1

Named as inventor:
Ernst Zimlich, Munich

by mowing the entire lawn at a low setting.

The invention is intended to avoid these disadvantages. This is done in that at a lawnmower, in which the engine can be inserted into an opening in the blade housing, on Edge of the opening of the knife housing perpendicular guides are arranged, of which on both sides further, mutually offset, serving as a stop, directed downwards at an angle Go out guides in which engage counter guides arranged on the engine.

In the figures, an embodiment of the invention is shown schematically and below described, but without the invention being limited to this embodiment.

F i g. 1 shows the lawnmower according to the invention in a vertical central section through the main axis and the gear axis;

F i g. 2 shows the tabs with the approximately vertical slot guides and those extending therefrom mutually offset and obliquely downwardly directed slot guides on their own.

The gear housing 4, 5 or a motor housing can be inserted into a central opening 7 of the knife housing 1. However, only one motor or gear shaft 24, 35 or its feeder 17 leading to the mower blade 12 can be passed through the appropriately designed opening 7 . At the edge of the central opening 7 , several tabs 26 are attached, as shown in FIG. The tabs, made of metal or plastic, have a central, approximately perpendicular slot 27 as a guide, from which further, mutually offset, serving as detents, obliquely downward or upward guides 28 extend on both sides, the ends of which 29 can run out a little horizontally if necessary. The mutually offset arrangement of the slots 28 , 29 results in a close staggering of the cutting height adjustment.

709 610/114

Claims (4)

i 244 457 Latching pins 30 correspond to the bezels 26, which are fixed in the side walls 5 of the pot-like housing 4 or on the periphery of a motor or gear housing and can optionally be provided with a head piece 31. It can be seen that the entire engine including mower blades 12 can be raised and lowered when the pins 30 are moved up and down within the slots 27, 28. A rapid change in the cutting plane of the mower blade 12 is thereby achieved. The locking of the pins 30 in the respective setting 29 takes place only through the weight of the motor and the design of the detents. If, in special cases, additional locking of the locking pins 30 in the end positions 29 is required, the head piece 31 is provided in the form of a magnet, ball catch, retaining clip, etc. for this purpose. Corresponding arrangements on the surface 8 or on the sides of the tabs 26 form the counterpart. In most cases, it will be sufficient to provide only one of the tabs 26 with an additional lock. In a formal, in the drawing not visible embodiment of the invention, the slot guides 27,28,29 instead of tabs 26 z. B. incorporated in a collar-like around the opening 7 led wall. The dirty lower part of the motor or Gear housing 4 is covered. In the case of a new design, it is possible to include the detents 27, 28, 29 in the overall design of the knife and motor housing. Due to the design, the detents 27, 28, 29 could be arranged in a concealed manner, e.g. B. below an engine or a fairing. In order to still be able to read the respective setting, a representation of the notches 27, 28, 29 with indication of the cutting height is transferred to a suitable location on the knife housing 1. A pin or arrow attached to the motor housing then shows the cutting height that has been set. The use of notches 27, 28, 29 is not intended to be restricted to the example shown on a lawnmower with an electric motor. The tabs 26, whose number of locking points 29 can be selected as desired, are suitable both for installation in lawnmowers with an internal combustion engine and for other purposes in which a rapid change in height position is important. In a special embodiment of the invention, a reduction gear 33, 34 can be built into the pot-like housing 4, which has an easily exchangeable housing cover 32. This housing cover is designed as a connection and coupling piece to match the motor used in each case. By simply exchanging the housing cover 32 with the coupling piece, z. B. any household motor can be used to drive the lawn mower. To start up the lawnmower, only the motor needs to be plugged in. The ability to adjust the cutting height quickly is advantageous in many cases, e.g. B. in tall grass, different types of lawns, new lawns, hot weather, under bushes, trees, ίο hedges, etc. Along unpaved roads, stones from vehicles can be thrown into the lawn. Here, as well as in all places where stones are suspected and cannot be seen in higher grass, it is advisable to first mow with a high setting, then remove the stones and mow the lawn at the desired height. The invention enables adaptation to the various circumstances in a matter of seconds, combined with a high level of safety thanks to the knife housing guided deep on the floor, low manufacturing costs and complete freedom from maintenance. Patent claims: 1. Motor-driven lawnmower with horizontally rotating knife in a housing open at the bottom, the engine being insertable into an opening of the knife housing, characterized in that vertically extending guides (27) are arranged at the edge of the opening (7) of the knife housing (1) from which further, mutually offset guides (28,29) , which are offset from one another and serve as detents, extend obliquely downward and into which counter guides ( 30,31) arranged on the engine engage. 2. Lawn mower according to claim 1, in which the front part of the motor housing is located in a further, pot-like housing, characterized in that the wall (5) of the pot-like housing (4 ) serves to receive or hold the counter guides (30,31) . 3. Lawn mower according to claim 1 or 2, characterized in that the guides (27, 28, 29) are designed as slots and the counter-guides (30, 31) are designed as pins. 4. Lawn mower according to claim 2 or 3, characterized in that the cover (32) of the lower part of the topfartigerr housing (4) serving as a gear housing is designed as a coupling piece for the particular motor used. Documents considered:
German utility model No. 1 771 790,
1802 469;
U.S. Patent No. 2,857,727. 1 sheet of drawings 709 610/114 7.67 © Bundesdruckerei Berlin