DE7504578U - Electrically operated lawn mower with dead man's switch - Google Patents

Description

Patent attorneys Dipl.-lng. hj ^ nö'L &rig'osich · * Dr.-Jng. · Heinz Hosenthien ^ i

7000 Stuttaart 1 Herdwea 62 Telephone (07 Vi) 296523 '

Applicant:

Fritz Roth KG

7000 Stuttgart-Feuerbach

Mauserstrasse 19

Electrically operated lawn mower with dead man's switch

The invention relates to an electrically operated lawn mower, in which the drive motor has a Τοΐ man switch can be electrically connected to the power grid, wherein the dead man's switch has at least one arranged on a handlebar manual control is switchable.

In such a mower known, for example from DT-O3 2 303 459, dos Guide handle two shift levers are provided, each of which is depressed by one hand. The drive motor is only switched on when both levers are pressed down at the same time, \ im so to keep the risk of injury to the operator as low as possible. When mowing, what is lying in the lawn must be used Mains cable often pulled out and from <ier mowing point be thrown away. This can only practically if no second person is to be used by the Eedienungsmann take place himself. To do this, at least one hand must be taken from the handlebar and it the drive motor is stopped each time. These business interruptions are undesirable because they significantly reduce the mowing performance.

? .3 are also: icch liasonr.viViDr brt *; nn; i '■ ""., Ba'. ■:. ·. ·. ■: the dead man's switch, for example, can only be actuated through the grooved edge. The power cord can then be moved with the left hand without interrupting the mowing process. However, moving the heating cable with the right hand is cheaper to carry out, in which case the mowing process is then inevitably interrupted.

7504578 03.87.7S

The invention is aimed at avoiding these disadvantages

The task is based on a lawnmower of the initially;

to create mentioned type, in which the Ketzkabel or

drooping branches under trees or the like. with a ·

moved or held back by any hand, [ without interrupting the mowing process and anyway

there is sufficient security against accidents

is. :

To solve this problem, the invention provides that

the manual operation is arranged on the long handle,

that they are independent both right and nit

the left hand can be operated. So is independent. &

one hand at a time to move the power cord or to Keeping branches or the like. free, without the

I I

is interrupted. Only when both hands from,;

Are taken, a standstill ■;

zv: n <5 of the drive motor ^. Without essential lie rahs-ik :: '■:, <:; ;

This increases safety with high mowing performance:

Handling of the lawnmower is made much easier. In Λ

Advantageously, for operation by a bc-:

dear hand the manual operation is via the, handle · - i

i
area of both hands of the crossbar extend, where

manual operation is advantageous as approximately parallel zcv \

i ₍

Transverse bar running switch rod formed siein xonn,. '■ where he has to switch on the dead man's switch in it. '. \ c: i ,

Fingers at least one hand can be pressed against the cross bar. In a further advantageous embodiment the manual operation can be designed as a shift cord stretched approximately parallel to the transverse spar.

In a preferred embodiment of a lawn mower, two arranged on the cross bar rides through one each The dead man's switch can be actuated independently by each of the two shift levers with manually operated shift levers. Appropriate; the dead man's switch and the Shift levers arranged in a two-part housing, the two shift levers being watertight through the housing shells are guided to prevent rainwater, condensation or spray water from entering the switch to prevent. To further safeguard the drive motor against overloading, it can be advantageous A circuit breaker is also provided in the housing be, this circuit breaker particularly advantageous also after a draw can be switched on again by one or both switch levers. The circuit breaker advantageously has trip-free, so that the power is switched off in the event of an overload despite the lever being depressed can.

7504578 Oi07.75

For comfortable, fatigue-free handling, the shift levers can have a cross-sectional profile adapted to the crossbar exhibit.

A simple, time-saving Mondays is possible, though the dead man's switch and possibly the circuit breaker inserted into the two-part housing and are secured against displacement by corresponding projections in the housing. Advantageously, ijn Housing a bracket with a U-shaped cross-section for switching the Toxmann switch and, if applicable, the circuit breaker be displaceably guided, the displacement being independent by each of the two shift levers can be done. To guide the bracket free of contamination, it can be placed between the walls of the insert bracket for the dead man's switch and / or tlen circuit breaker on the one hand and on the other hand by walls for the inclusion of compression springs for the shift lever ?. be led.

Further advantages and features of the invention emerge from the following description, on the basis of which attached drawings as well as from further subclaims. It shows:

Fig. 1 is a plan view of the guide: -. » handle of a lawn mower with removed upper housing shell de; Dead man switch,

7604578 07/03/75

F sharp. 2 is a side view thereof according to FIG the arrow II in Fig. 1,

3 shows a section through the dead man's switch along the line ΙΙΙ ·· ΙΙΙ in Fig. 1 and

4 shows a section through a shift lever along the line IV-IV in Fig. 1.

In the middle of a transverse bar 1 of a guide bar 2 of an electrically operated lawn mower, not shown in detail, a dead man's switch 5 is arranged in a housing consisting of two housing shells 3 and 4. The dead man's switch 5 can be switched on independently of two switch levers 6 and 7 running approximately parallel to the crossbar 1, the drive motor of the lawn mower being electrically connected to the mains connection when one or both switch levers 5 or 7 against -.I- ^! Cross member 1 are drawn. For convenient operation, the shift levers 6 and 7 are each conveniently accessible by one hand and arranged within reach in the grip area of the crossbar 1. The shift levers 6 and 7 are on Bolzer. 8 or 9 pivotably mounted against springs 10, 11, the ends of the shift levers 6 and 7 on the inside of the housing acting on a U-shaped bracket 12 via which doi *

7504578 03.D7.7i

actual switch 13 and at the same time also ejin circuit breaker 14 can be actuated.

The bracket 12 is symmetrical between walls! 15.16, between which the switches 13 and 14 inserted; are and walls 17 and 18, through which the springs 1Ö and 11 are held, slidably guided.

To move the switch 13 and the circuit breaker To prevent 14, the walls 15 and 16 are provided with projections 19 and 20 so that the switch 13 and 14 only need to be inserted during assembly without additional fasteners.

The circuit breaker 14 is provided with a trip-free device, through which the power supply in the event of a motor overload to the drive motor is interrupted. This interruption occurs regardless of whether the gear lever; 6 and 7 ^ ii-.iruckt are not oclor. By pressing down again at least one of the switching levers 6 or 7 is; the circuit breaker 14 after cooling down again in brought its provision.

casing

The existing from the housing shells 3 and 4 is waterproof, so that no Condensation or splash water penetrates the interior

Rainwater

-S-

gen can. There is a plug connector on the underside of the housing 21 for the power cord, the one

! Plug of the power cord, not shown, with a protective collar 22 partially encloses. The connecting cable 23 between the dead man's switch and the drive motor is, as can be seen from FIG. 1, arranged partially protected against damage in the tubular guide rail 2.

For convenient, fatigue-free handling, the shift levers 6 and 7 are approximately arcuate in cross-section designed complementary to the cross member 1, so that when the shift lever 6 or 7 is depressed, an unimpeded Management of the guide rail 2 is possible. The power supply of the drive motor is switched on as long as a shift lever 6 or 7 is depressed, which can be done with one hand, the other hand is dariTi free to pull the power cord further or throw it away to be able to protect it from damage when planning or around hanging branches or To be able to hold branches off while mowing in order to have a clear view.

Claims (12)

Protection claims 1. Electrically operated lawn mower, in which the drive motor is connected to the The power network can be connected electrically, the dead man's switch being switchable via at least one manual control arranged on a guide rail, thereby characterized in that the manual control is arranged on the guide rail (2) so that it is independent; can be operated with the right as well as with the left handle. 2. Mower according to claim 1, wherein the guide bar has a cross bar that can be grasped with both hands, characterized in that the manual operation extends over the grip area of both hands Querholms (1) extends. 3. Mower according to claim 2, characterized in that the manual operation as approximately parallel to the cross bar (1) running switch rod is designed to turn on the dead man's switch (5) with the Fingers at least one hand on the cross bar (1) can be pressed. 7504578 03.97.75 4. Mower according to claim 2, characterized in that c ».?., '■'. the manual control is designed as a shift cord stretched parallel to the transverse spar (1). 5. Mower according to claim 1 with two arranged on the cross bar, by one hand-operated lever, characterized in that the dead man's switch (5) can be actuated independently by each of the two shift levers (6,7). 6. Mower according to claim 5, wherein the dead man's switch is arranged in the center of the crossbar and the both shift levers protrude on both sides, thereby characterized in that the dead man's switch (5) and i; the switch levers (6,7) in a two-part housing are arranged and the two shift levers (6.7) waterproof through the housing shells (3.4) are led. 7. Mower according to claim 6, characterized in that In addition, a circuit breaker (14) in the housing aiii Overload protection is provided and this circuit breaker (14) also after a trip can be switched on by one or both switch levers (6,7). 7504578 83.07.75 ■ - ■ ii- 8. Mower according to claim 7, characterized in that the circuit breaker (14) with a trip-free trip is provided. 9. Mower according to claim 5, characterized in that the switching lever (6,7) is adapted to a cross member (1) Have cross-sectional profile. 10. Mower according to claim 6 or 7, characterized in that the switch (13) and optionally the Circuit breaker (14) placed in the two-part housing and secured by corresponding projections (19, 20) in the housing are secured against shifting. 11. Mower according to claim 6, characterized in that in the housing a cross-sectionally U-shaped bracket (12) to switch the dead man's switch (5) and; ; ': ^; ib ..- ri? r. 1 al? .S of the Sch'jtzj.c'ialters (14) is guided displaceably and can be displaced independently by each of the two switching levers (6,7). 12. Jay according to claim 11, characterized in that dai> for guiding the bracket (12) walls (15, 16) of the insert holder for the switch (13) and / or 7504578 03.i7.7i 1'ί (ο the circuit breaker (14) on the one hand and other soifcs walls (17,18) for receiving compression springs (10,11) serve for the shift lever (6,7) (Fig. 1). 7504578 8107.75