Cutting – Interrelated tool actuating means and guard means – Work guard
Patent
1988-09-23
1990-12-25
Phan, Hien H.
Cutting
Interrelated tool actuating means and guard means
Work guard
83478, 83489, 83490, 125 14, B27B 518, B28D 104
Patent
active
049794124
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATIONS
FIELD OF INVENTION AND PRIOR ART
This application includes subject matter disclosed in U.S. Pat. No. 4,885,966 issued Dec. 12, 1989.
This machine is related to a sawing machine of the kind is disclosed in U.S. Pat. No. 3,722,497. In this machine the arm is secured against rotation relative to a sleeve, within which there are means for power supply to the member supporting the saw tool in order to cause rotation of the member. The sleeve projects into the housing from a point outside the same and between the sleeve and the housing there is a bearing device for rotatably supporting the sleeve. In sawing machines of this kind the arm will be subjected to considerable stresses during the sawing work. Since the bearing device in the known machine is located between the sleeve and the housing and accordingly at a relatively large distance from the longitudinal center line of the arm, the bearing device will be subjected to considerable stresses, which cause need of robust dimensioning and thereby relatively high costs. The relatively large distance between the bearing device and the longitudinal center line of the arm causes further that a certain play in the bearing device, e.g. due to wear, will result in an even greater play as to the position of the arm, which makes it difficult to carry out exact saw cuts. Further, in the known machine a gear rim for pivoting the arm is arranged internally in the housing on the rotatable sleeve. Thus, the torque will be transferred to the arm via the rotatable sleeve and this causes additional considerable load on the bearing device of the sleeve. Finally the known machine is mechanically driven via gears arranged in the arm, which causes a relatively costly design.
SUMMARY OF THE INVENTION
The object of the present invention is to devise ways to reduce problems indicated hereinabove. In particular, the invention aims at devising a contruction which is well suitable for driving the saw tool by means of a fluid motor coordinated with the arm.
The object mentioned hereinabove is achieved according to the invention by providing the sawing machine with the features appearing from the characteristics of the appendent claims.
BRIEF DESCRIPTION OF THE DRAWINGS
With reference to the appended drawings, a more specific description of an embodiment example of the invention will follow hereinafter.
In the drawings:
FIG. 1 is a perspective view of the sawing machine from the upper side thereof, the guard for the saw tool having been omitted,
FIG. 2 is a perspective view of the sawing machine viewed in the opposite direction compared to FIG. 1,
FIG. 3 is a cross section taken along the line III--III in FIG. 1, the pivotable arm of the machine being pivoted upwardly so that the section passes through and along the centre of the arm,
FIG. 4 is a section through the pivotable arm parallel to its plane of pivoting, it being remarked the view is highly diagrammatical and has been simplified by omitting details otherwise appearing from FIG. 3; the view illustrates the fluid motor built into the arm and the fluid supply thereof,
FIG. 5 is a likewise simplified and diagrammatical view illustrating co-operation between components contained in the device for rotating the rotatable element and accordingly changing the position of the guard related to the arm, the viewing direction being parallel to the pivot axis of the arm,
FIG. 6 is a side view of the complete sawing machine including guard for the saw tool, the machine being illustrated attached to a rail and during sawing in e.g. a wall, to which the rail is secured,
FIG. 7 is a cross section along the line VII--VII in FIG. 6, and
FIG. 8 is a view similar to FIG. 5 but illustrating an alternative embodiment.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
The sawing machine according to the invention comprises a body 1 and an arm 3 pivotable relative to the body about an axis 2. On the arm 3 (FIG. 3) a member 4 in the form of a saw spindle is arranged rotatable about an axis spaced from the pi
REFERENCES:
patent: 2814110 (1957-11-01), Ackley et al.
patent: 2996088 (1961-08-01), Hensley
patent: 3323507 (1967-06-01), Schuman
patent: 3722497 (1973-03-01), Hiestand et al.
patent: 4318324 (1982-03-01), Hall et al.
Jones Eugenia A.
Phan Hien H.
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