Concrete floor finishing machine

Details Concrete floor finishing machine Concrete floor finishing machine

1987-02-20

1988-10-04

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

With transportation device for relocating molding apparatus...

51177, 404112, 425456, 425458, B28B 1108

Patent

active

047753064

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. Technical Field
The present invention relates to a concrete floor finishing machine for finishing concrete floor surfaces after concrete is deposited, and more particularly to a concrete floor finishing machine comprising a vehicle body including a pair of propelling devices, and a finishing device for smoothing out concrete floor surfaces in half-set state.
2. Background Art
A known finishing machine of this type comprises a vehicle body including a pair of propelling devices, and a finishing device rotatable about the vehicle body as disclosed in Japanese patent application laid open under No. 60-47159 for example. This known finishing machine having the finishing device rotatable about the vehicle body has great practical advantages in that it is capable of finishing a large area in one run compared, for example, with a machine having a finishing device drawn by a vehicle body, and that its propelling devices leave no traces on the concrete floor surfaces regardless of the running direction of the propelling devices.
However, since the finishing device rotates about the vehicle body, its radius of rotation tends to be large and the entire finishing device itself must be large. This renders the finishing device heavy and accordingly requires large and heavy bearings and motor. As a result, the entire finishing machine becomes complicated and heavyweight. During a finishing operation, therefore, the propelling devices tend to mar the concrete floor surfaces to excess. Further, since this known finishing machine cannot readily make a small sharp turn and its finishing device has a large radius of rotation, it inevitably leaves large unfinished parts in corners of the concrete floor. This machine is unsuitable for finishing a small area of concrete floor in particular, and leaves room for improvement in this respect.


DISCLOSURE OF INVENTION

The present invention has been made having regard to the above-noted disadvantages of the prior art, and its object is to provide a compact and lightweight concrete floor finishing machine retaining the advantages of the known finishing machine and yet capable of finishing a small area of concrete floor also.
In order to achieve this object a concrete floor finishing machine according to this invention is characterized in that finishing devices are provided one for each of the propelling devices to be driven to revolve around the propelling devices, respectively.
Since the finishing devices are driven to revolve around the propelling devices, respectively, the finishing devices themselves are substantially reduced in size and weight compared with the known finishing device rotatable around the vehicle body although the number of finishing devices is twice. As a result, bearings, motors and other components are also reduced in size and weight, rendering the entire finishing machine itself compact and lightweight. Moreover, these finishing devices have a substantially diminished radius of rotation thereby to greatly reduce unfinished parts left in corners of the concrete floor.
It will be understood from the above description that the concrete floor finishing machine according to the present invention retains the advantages of the known finishing machine noted at the outset of this specification and yet is compact and lightweight to perform a finishing operation leaving only small unfinished parts in corners of the concrete floor. Therefore this finishing machine is capable of finishing a small area of concrete floor by making full use of its ability to make small sharp turns and without marring the floor surfaces to excess.


BRIEF DESCRIPTION OF DRAWINGS

The drawings illustrate concrete floor finishing machines embodying the present invention, in which:
FIG. 1 is a plan view of a concrete floor finishing machine,
FIG. 2 is a partly broken away front view of the finishing machine,
FIG. 3 is a sectional view taken on line III--III of FIG. 2, and
FIG. 4 is a partly broken away front view of a modified finishing machine.


BEST MODE FOR CARRYING OUT THE I

REFERENCES:
patent: 822050 (1906-05-01), Jenkins
patent: 3146559 (1964-09-01), Wilkinson
patent: 4312603 (1982-01-01), Whiteman

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