Harvesters – Motorized harvester – Having fluid-pressure or stored-energy motor
Patent
1998-05-07
1999-08-17
Melius, Terry Lee
Harvesters
Motorized harvester
Having fluid-pressure or stored-energy motor
56 1, 429 96, A01D 6900, A01D 6902
Patent
active
059376236
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a lawnmower with an electric motor for driving the cutting implements which is fed by a rechargeable battery, having the features specified in the preamble of patent claim 1. Such a lawnmower is known from WO 95/08 256. In the case of the latter, the connection contacts between battery and chassis are designed as plug-in contacts, and these plug-in contacts simultaneously form a mechanical attachment means which are intended to attach the battery in a holder of the lawnmower chassis. In this case, the contact sockets attached to the battery cover are mounted in a floating manner, i.e. laterally displaceably, in this cover, in order that contacting can take place even if they are not placed exactly onto the pin connectors in the lawnmower chassis. The floating mounting means that mechanical attachment of the battery in the chassis is possible only to a limited extent. Furthermore, in particular if vibration occurs, reliable contact-making is not ensured, especially when one considers the high currents which flow during the operation of such a lawnmower.
The invention is therefore based on the object of improving the mounting of the battery in the chassis holder. The set object is achieved by the features specified in the characterizing part of patent claim 1. The battery is secured in the battery compartment in an interlocking manner by the lock bolts, and it cannot fall out from its holder even if the lawnmower is tilted or turned over for some reason or other. The locking means automatically engage when the handle joined to the battery housing is folded down. Similarly, automatic unlocking occurs when the handle is swung up, in order to grasp the battery by the handle and take it out in order that it can be charged elsewhere.
The electrical contact-making is completely separate from the mechanical attachment means. Since, according to claims 10 and 11, these contacting means are designed as sliding-action contacts, it is not necessary to overcome any great force when removing or inserting the battery, because the contacts are designed as sliding-action contacts. On the other hand, considerable forces have to be exerted if, as in the prior art, the plug-in contacts simultaneously effecting the mechanical attachment have to be plugged one into the other or pulled apart, because the plug-in contacts oppose the displacement with a much higher resistance.
The design of the sliding-action contacts according to the invention also effects a self-cleaning of the contact areas, with the result that reliable contact-making is always ensured.
Further developments of the invention emerge from the subclaims.
An exemplary embodiment of the invention is described below with reference to the drawing, in which:
FIG. 1 shows a diagrammatic representation of the battery, fitted in a lawnmower, with the attachment means;
FIG. 2 shows a diagrammatic representation of the battery with the contacting means;
FIG. 3 shows a perspective representation of the locking means coupled to the handle;
FIG. 4 shows a perspective, partially broken-open view of the battery compartment of a lawnmower with flexibly supported battery; and
FIG. 5 shows a partial vertical section of the battery holder and battery contacting means.
In the drawing, only the parts essential for the invention are represented, namely the battery, the battery holder and locking means as well as the contacting means, while the individual parts of the lawnmower are merely indicated. The lawnmower, which has on its chassis the compartment for fitting the battery, may be designed in various ways. It has, in a known way, an electric motor, which is fed by the battery 10 via connection leads (not shown). The battery 10 is an electrochemical secondary element, and nickel-cadmium batteries or lead-acid batteries primarily come into consideration for this. The battery is located in a housing, and the reference numeral 10 denotes the housing with the fitted battery.
The battery housing bears a handle 12, the side legs 14 of which can pivot about a spindl
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Kováacs ÁArpáad Fáabiáan
Melius Terry Lee
Wolf-Gerate GmbH Vertriebsgesellschaft
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