DE1482249A1 - Self-propelled lawn mower - Google Patents

Description

Self-propelled lawn mower

In the main patent (Pat.Ann. W J> 6 I ² TJ III / 45c) is

a self-propelled lawn mower is described in which the drive motor is mounted on a chassis provided with four wheels as well as the seat for the operator and the steering linkage are arranged. The drive motor drives over a The shaft mounted vertically in the chassis is the cutting knife running horizontally on the underside of the chassis.

The subject of the invention of the main patent is on the one hand a device through which the cutting knife together with the this surrounding guide housing can be adjusted in height to select the cutting height of the grass as desired. The invention of the main patent on the other hand relates to a device which makes it possible to eject the grass from the guide housing A desire to achieve either on one or the other long side of the chassis or on one end.

909816/0333

ORlGiNAL INSPECTED

U82249

The present invention relates to further embodiments of these two devices, which both together and each of them can be used in a lawnmower.

Embodiments of the invention are explained with reference to the drawing. In the drawing show:

Fig. 1 is a longitudinal section along the line I - I of Fig. 3,

2 shows the radially sectioned individual view of the bearing of one of the three for supporting the guide housing the support rollers provided for the lawnmower,

FIG. 3 shows a section along the line II-II of FIG. 1, however on a smaller scale,

FIG. 4 shows a sectional view of the bearing body with traverse, in the side view rotated by 90 ° with respect to FIG. 1.

The parts of the self-propelled vehicle that are not essential for the invention Lawn mowers are omitted from the drawing.

As the drawing shows, the shaft 3 carrying the rotating knife 2 is mounted on the chassis 1 by means of a bearing body 4, the flange plate of which is screwed to the upper chassis or housing plate of the lawnmower. The bearing body continues downward in a guide sleeve 4 ¹ and upward in a guide sleeve 4 ″. In its lower part, the bearing body 4, as can be seen from FIGS is anchored on both sides in the chassis or housing of the lawnmower

In the lower guide sleeve 4 ^{1 of} the bearing body, a bearing bush 8 is rotatably mounted with the help of needle bearings, which is rotatably connected on the one hand to the pulley 5 and on the other hand is rotationally fixed in engagement with the cutter shaft 3, but so that the shaft 3 can be moved axially . After Pig. 1 shows the connection between the bush 8 and the shaft 3 with tongue and groove, but the shaft 3 could, for example, also be polygonal. The pulley 5 is their drive by means of belts 5 ¹ of the keyed to the motor shaft 20 pulley 19. The pulley I9 also provides Λ by belts 21 * the drive to a pulley 21 which is keyed on a leading to the drive rubbing work of the lawn mower shaft 22nd At its lower end, the shaft 3 carries a driver hub 6 to which the knife 2 is attached.

The guide housing 7 and the pbere end of the shaft 3 are carried by a three-armed slide 9, which can be adjusted in height by means of a stick 10 protruding upwards and can be set in the selected height position. For this purpose, a transverse pin I3 is attached to the stick 10, which ( similar to that described in the main patent, can be inserted into selectable slots of a stepped detent 12 provided in an attachment 11. In FIG of the carriage shown in the uppermost vertical position. 9 for guiding the lever 10 and the crank 17 described in more detail below a guide plate I ¹ may be mounted on the device housing. 1

· / · 909816/0333

The three-armed carriage 9 has an upper sliding sleeve 9 * and a lower sliding sleeve 9 ". Each of these sliding sleeves forms the center piece of a three-armed slide body, with the arms of the upper and lower slide bodies are each united by a bolt 14 to form a slide which forms a rigid unit are. This structure has the advantage that the mechanical Vibrations, are kept away from the Leitgeliäuse 7 attached to the slide 9.

In the upper sliding sleeve 9 ¹ , the upper end of the shaft J5 is mounted by means of ball bearings in such a way that the shaft 3 can ^{rotate in the sleeve 9 *, but is carried by the sleeve 9 1} and is axially displaced together with it. The lower slide body carries the guide housing 7 , 7 ¹ > so that when the stick 10 or the slide 9 is adjusted in height, the height of the knife 2 and the guide housing 7 are adjusted together and their mutual position is maintained. In order to facilitate the height adjustment of the carriage and carried by said parts), the chassis 1 and each arm of the lower carriage body springs $ 1 are mounted between the upper part, which compensate for the weight of the unit adjustable in height approximately. According to a further useful feature of the invention, the guide housing 7 is supported by the lower slide body 9 with the interposition of damping bodies 16 made of rubber or another elastic material to prevent the vibrations from the drive of the lawnmower still occurring in the slide frame to the. Guide housing 7

909816/0333 _{# />}

ORIGINAL INSPECTED

keep away. This design is particularly advantageous when, as described in the main patent, the guide housing 7 can be rotated is arranged around its ejection opening as desired to be able to rotate in different settings. Accordingly, in the embodiment described, those made of rubber existing damping body 16 designed and arranged so that they can also serve as a roller guide on which the correspondingly designed guide housing 7 * if it is to be rotated about its axis, is guided. To that end is each of ™ disposed on the arms of the lower carriage body Damping body 16, as can be seen from FIGS. 1 and 2, on a pin 24 or the like. rotatably mounted and designed in its profile so, that it engages in a corresponding mating profile of the guide housing 7. As can be seen in Fig. 1, the counter profile is of the guide housing 7 formed in that a special guide flange 7 * is attached to the top of the guide housing is, so that the guide housing is supported on the roller bodies 16 on the one hand and on the other hand is guided during rotation.

The invention extends to the further idea of not only arranging the guide housing 7 so that it can be rotated, but at the same time taking a precaution that allows the lawnmower driver to rotate the guide housing as required without leaving the driver's seat. This is advantageous in all cases where it is necessary to change the ejection direction of the lawnmower very frequently and at short time intervals, such as when the lawnmower is in a cemetery or

90 9816/03 33 " ^{/ #}

U822A9

a park and the like, where certain considerations have to be taken in the direction of the grass ejection. For this purpose, the invention provides that, as shown in Fig. 1, one of the rollers 16 carrying the guide housing is rotatably connected to a shaft 17 which can be rotated in one direction or the other by a crank 18 accessible from the driver's seat to adjust the guide housing 7 and thus the direction of the grass discharge as desired. / ^x

Finally, the invention provides an expedient design in which, as can be seen from FIGS. 1 and 5, the axis of symmetry Y of the guide housing offset by a small amount against the axis of rotation X of the cutter bar in the direction of travel (Fig. 3, left) is. This ensures that the gap remaining between the guide housing and the knife tip, regardless of the direction of the grass discharge set in each case, is slightly larger than on the opposite side, which is on the Grass clippings have a beneficial effect.

χ As indicated in Fig. 1, the crank 17,18 can also be used are to lock the guide housing 7 in the respective set position. For this purpose, as can be seen in FIG. 1, the the roller 16 holding pin through an elongated hole in the crankshaft 17, such that the crankshaft 17 from the dar-

> set situation. can be moved down a little.

* The lower end of the shaft 17 then engages to lock the Guide housing 7 into an opening which is provided in the guide housing in each of the positions to be locked. To the Leitgehäusc 7, the crank 18 with the shaft / | 7 lifted slightly to release the lock. χ

Patent claims:

Claims (12)

"T" U82249 claims: 1) Self-propelled lawn mower with vertically mounted drive shaft, at the lower end of which the cutting knife runs in a horizontal plane, with the shaft carrying the knife is mounted on the chassis by means of a bearing body, in which also the belt pulley driven by the motor is arranged, according to patent (patent application W J56 14 ^ IIl / 45c), characterized in that the bearing body continues upwards and downwards in a respective ä guide sleeve (V or 4 ¹ ) and that the guide housing (7) and the upper end of the knife shaft (3) are carried by a height-adjustable slide (9), which is fitted with an upper sliding sleeve (9 ^! ) In the upper guide sleeve (V) of the bearing body and guided with a lower sliding sleeve (9 ") on the lower guide ^{sleeve (4 1} ) of the bearing body 2) lawn mower according to claim 1, characterized in that that between the upper part of the chassis (1) and the carriage (9) tension springs (I5) are attached, which Approximately compensate for the weight of the height-adjustable unit. 909816/0333 3) Lawn mower according to claim 1 or 2, characterized geke η η - _: characterized in that a bearing bush (8) is rotatably mounted in the lower guide ^{sleeve (4 1} ) of the bearing body, which on the one hand with the pulley (5) and on the other hand with the knife shaft (j5) is engaged in a rotationally fixed manner. h) Lawn mower according to one of claims 1 to J>, characterized in that the carriage (9) is designed with three arms, the sliding sleeve (9'ftzw. 9 ") forming the center piece of the upper three-armed carriage body or the lower three-armed carriage body and the arms of the two slide bodies are each united by a bolt (14) to form a rigid unit. 5) lawn mower according to one of claims 1 to 4, characterized in that the carriage (9) by means of a upwardly protruding stick (10) adjusted in height and set in selectable slots of a step notch (12) can be. 6) Lawn mower according to one of claims 1 to 5 *, characterized in that the guide housing (7) of the lower slide body is supported with the interposition of damping bodies (16) made of rubber or another consist of elastic material. 909816/0333 7) Lawn mower, in which the guide housing is arranged so that it can rotate around the drive shaft in order to divide its discharge opening into different positions To be able to rotate settings, in particular according to claim 6, characterized in that made of rubber or the like. existing damping body (16) are designed and arranged so that they also act as a roller guide serve, on which the guide housing (7) is guided when it is rotated. 8) lawn mower according to claim 7> characterized that each of the damping bodies (l6) arranged on the arms of the lower slide body is on a pin (24) or the like. rotatably mounted and designed in this way in its profile is that it engages in a corresponding mating profile of the guide housing (7). 9) Self-propelled lawn mower, in particular according to one of claims 1 to 8, characterized in that the drive device used to rotate the guide housing by the driver of the lawnmower without him having the Needs to leave the driver's seat can be operated. 10) lawn mower according to claim 9, characterized in that that one of the rollers (l6) carrying the guide housing (7) is non-rotatably connected to a shaft (17) which is Appropriately accessible from the driver's seat, the crank (l8) can be turned in one direction or the other to move the cable housing (7) to be adjusted. 9 09 816/0333, U822A9 11) lawn mower according to claim 10, characterized in that that the crankshaft (17,18) is arranged to be longitudinally adjustable in the drive roller (16) and in its lower position engages in an opening provided in the guide housing (7) in order to move the guide housing in the respectively set position Lock position. 12) lawn mower according to one of claims 1 to 11, characterized in that the axis of symmetry (Y) of the guide housing by a small distance against the axis of rotation (X) of the cutter bar is offset in the direction of travel. 909816/0333