Brushing – scrubbing – and general cleaning – Machines – Wiping
Patent
1992-05-29
1993-09-14
Roberts, Edward L.
Brushing, scrubbing, and general cleaning
Machines
Wiping
15 491, 15180, 15230, 51177, 403328, B24B 2900, A47L 11164, A47L 11282
Patent
active
052437272
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a floor polisher equipped with several kinds of rotary cleaner units exchangeable in accordance with the cleaning purpose, and more particularly to an arrangement for mounting the rotary cleaner units.
2. Description of the Prior Art
The rotary cleaner units of a floor polisher tend to become dirty frequently and thus must be exchanged frequently. Therefore various kinds of methods have been proposed for the exchange of the devices, for example, as disclosed in Japanese Utility Model Laid-open Publication Jikkaisho 62-33757 (33757/1987).
More specifically, referring to FIGS. 8 and 9, a main body 1 of the conventional floor polisher has a brush motor 2 built thereinside. A rotary shaft 3 of the brush motor 3 protrudes out of the bottom face of the main body 1, so that a rotary cleaning device 4 can be detachably mounted to the floor polisher.
A mounting flange 6 with a dovetail groove 5 and, a turnable lock lever 7 are provided at the bottom face of the main body 1. A connecting plate 8, engaging parts 9 and a pressing part 10 are arranged on the upper face of the rotary cleaning device 4.
In the above-described structure, when the rotary cleaning device 4 is to be mounted, while the lock lever 7 is raised and the engaging parts 9 are held open, the rotary cleaning device 4 is slipped into position below the main body 1. Then, the lock lever 7 is turned to thereby fasten the connecting plate 8 fitted into the dovetail groove 5 of the flange 6.
According to the conventional method described above, it is necessary to turn the lock lever at the floor side of the main body of the cleaner so as to engage the rotary cleaning device. The operation is not only inconvenient from a sanitary viewpoint, but is considerably troublesome since it necessitates manipulation of the lock lever which cannot be seen by the operator.
SUMMARY OF THE INVENTION
The object of the present invention is therefore to provide a floor polisher for which rotary cleaner unit can be easily exchanged so as to save labor when the rotary cleaner units are mounted or detached.
In order to accomplish the aforementioned object, according to the present invention, a floor polisher is provided with a motor incorporated therein, a driving shaft connected to the motor and protruding from the bottom face of a main body of the cleaner, and a rotary cleaner unit detachably mounted to the driving shaft. The driving shaft is formed to have polygonally-shaped front end, with a step formed in the outer periphery thereof. On the other hand, the rotary cleaner unit has a polygonal axial hole to be engaged with the polygonal end of the driving shaft, and a lever to be engaged with the stepped portion of the driving shaft to thereby prevent the rotary cleaning device from slipping off the shaft. The lever is freely slidable forward and backward, is urged in the direction of the stepped portion, and has an inclined surface formed at its front end.
According to a further aspect of the floor polisher of the present invention, the axial hole of the rotary cleaner unit is formed in the inner face of a cylindrical boss, and a radially extending cut-out is formed in the boss to meet with an upper portion of the axial hole to allow the driving shaft to be inserted in a radial direction into the axial hole. Therefore, the floor polisher of the present invention becomes more convenient for use.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other objects and features of the present invention will become clear from the following description taken in conjunction with the preferred embodiments thereof with reference to the accompanying drawings throughout which like parts are designated by like reference numerals, and in which:
FIG. 1 is a perspective view of a rotary cleaner unit of a floor polisher according to one embodiment of the present invention;
FIG. 2 is a cross-sectional view of the whole of the floor polisher of FIG. 1;
FIGS. 3, 4 and 5 are cross sectional views explanatory
REFERENCES:
patent: 244280 (1881-07-01), McVay
patent: 814020 (1906-03-01), Clifford
patent: 4917442 (1990-04-01), Johnson
Kinoshita Kazutoshi
Morita Tsutomu
Tanaka Osamu
Matsushita Electric - Industrial Co., Ltd.
Roberts Edward L.
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