Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1989-12-15
1992-08-18
Stephan, Steven L.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
30DIG1, 320 35, 320 36, H02J 700
Patent
active
051402491
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an electric motor driven grass cutter and, more particularly, to a rechargeable electric motor driven grass cutter.
A rechargeable grass cutter is known comprising a housing, an electric motor, reciprocating cutting blades projecting from the housing and drivable by the electric motor, a chargeable storage battery and a socket for the charging the storage battery. The socket, which is electrically connected to the storage battery, is mounted on the housing and connects a charging device to the storage battery for slow normal charging operation. An electrically operated grass cutter which comprises chargeable batteries, which are fixedly installed, and a socket and is connectable with an alternating current source is already known from U.S. Pat. Ser. No. 36-23-223. The long charging time required with conventional charging devices is annoying for the user if only a short piece of lawn or the like is to be cut after the storage battery is empty. He can then only complete his gardening work after a long charging time, e.g. on the next day.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an electric motor-operated grass cutter of the above-described typed, in which the chargeable storage battery driving the electric motor can be charged more quickly than the current electric motor-operated grass cutter as well as at a slow normal charge rate.
These objects and others which will be made more apparent hereinafter are attained in an electric motor-operated grass cutter comprising a housing; an electric motor; a plurality of cutting blades projecting from the housing, at least one of which is driven by the electric motor so as to reciprocate, and a chargeable storage battery connectable electrically with the electric motor and having a plurality of electrical contact lugs.
According to the invention, the grass cutter also comprises a charging socket accessible from outside of the housing. The storage battery is electrically connectable via the charging socket for trickle charging and, alternatively, for quick charging. The chargeable storage battery is structured to be quick-chargeable. The temperature contact lug is connected to the chargeable storage battery for transmitting measured values of temperature for monitoring the quick charging.
In a preferred embodiment additional contact lugs connected to the battery can be provided in the charging socket for easy connection of the battery with the charging device.
In contrast, the grass cutter, according to the invention has the advantage that its operational possibilities are expanded and its availability with respect to time is increased. The storage battery of the grass cutter can be charged quickly as needed in a brief period of time, so that the cutter is already fully ready for use again after an hour. In order to protect the storage battery, a third contact for monitoring the temperature is provided in addition to the positive and negative contacts. In normal use, when the capacity of the storage battery is sufficient for the lawn work, the storage battery is charged slowly in a careful manner with an inexpensive trickle charging device.
Advantageous developments and improvements of the grass cutter are made possible by means of the steps indicated in the subclaims. It is particularly advantageous that the storage battery be easy to remove from the grass cutter. Moreover, the removability facilitates the separate disposal of a used storage battery in a manner not harmful to the environment. When the contact for the temperature monitoring is connected to a charging socket in the housing, the desired charging device need only be plugged in in order to charge the storage battery either quickly or slowly.
BRIEF DESCRIPTION OF THE DRAWING
The objects, features and advantages of the present invention will now be illustrated in detail in the following detailed description, reference being made to the accompanying drawing in which:
FIG. 1 is a longitudinal cross sectiona
REFERENCES:
patent: 2529038 (1949-04-01), Medlar et al.
patent: 2597735 (1952-05-01), Jepsom
patent: 3329880 (1964-04-01), Boyles
patent: 3883789 (1975-05-01), Achenbach et al.
patent: 3999110 (1976-12-01), Ramstrom et al.
patent: 4560915 (1985-12-01), Soultanian
patent: 4833390 (1989-05-01), Kumada et al.
Linder Walter
Ruepp Urs
Dougherty Thomas M.
Scintilla AG
Stephan Steven L.
Striker Michael J.
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