EP1512506A1

EP1512506A1 - Planer with abrasive tool

Info

Publication number: EP1512506A1
Application number: EP04425549A
Authority: EP
Inventors: Ezio Trevisiol
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-09-03
Filing date: 2004-07-21
Publication date: 2005-03-09
Anticipated expiration: 2024-07-21
Also published as: EP1512506B1; ITTV20030122A1; DE602004009007T2; ES2291842T3; DE602004009007D1

Abstract

Electric tool able to smooth surfaces by means of abrasion made up of: front plate (1) for resting on surfaces adjustable in height able to determine the depth of material to be removed by the abrasive tube (3). Rear plate (2) for resting on surfaces adjustable in height through a mechanism enabling it to work at a tangent, with its own ideal length, to the external diameter of the abrasive tube which will vary according to the grain, the type of abrasive and to the wear during use. This rear plate (2) will have a width equal to or less than the width of the abrasive tube (3) and will be aligned to the abrasive tube in a way that it will slide in the indentation left by the abrasive tube. Interchangeable abrasive roller (3) fitted onto a roller-carrier mechanism placed between the above mentioned plates and powered in its rotation in a transverse horizontal axis in relation to the direction of manual advancement of the machine, the rotational direction being opposite to the manual direction of the machine. Rear handle (4) with switch. Front handle (5) with mechanism for adjusting the front plate. Electric motor (7), will transmit its movement to the operating roller by means of a belt and pulleys, or gears. Point of control (8) of the mechanism to adjust the rear plate. Dust exhaust (9). Body of the machine (10).

Mention is also made of a mechanical arrangement for the height adjustment of the rear plate (fig 5) and two mechanical solutions for the locking function between abrasive sleeve and slaveholder roll (fig 6-7).

Description

Currently the electric tool for the smoothing of surfaces, to be used manually and freehand, is called «PLANER ». The mechanical arrangement that distinguishes it is comprised of two plates for resting on the surface to be worked, parallel to each other, one of which can be raised to determine the depth of material to be removed at each pass and a rotating cylinder-roller placed between them with a transverse axis to them, driven by electric motor, and equipped with blades or knives which will produce the removal of material in the form of shavings.
One of the fundamental points in this arrangement is the absolute alignment between the circumference as described of the blades in action and the ideal protrusion of the rear plate. (fig. 2 & 3) For this purpose there are parts of the cylinder-roller called knife holders that allow these to be micrometrically positioned in relation to the said fixed rear plate. (n°2 fig 2)
A further fundamental requirement is that the movable plate (n°1 fig 3) is raised in absolute parallel with the fixed plate (n°2 fig 3) to allow the depth of the pass.
Also fundamental is that the rear plate (n°2 fig 4), should be of equal or lesser width than the operating cylinder-roller (n°3 fig 4) and that it should be aligned with it so that it can rest on the new surface created by the cylinder during the removal of material.
Given that these are the essential criteria for obtaining the smoothing of surfaces, we see that the blades of the traditional planer are not suitable for working all surfaces and that they at times produce rough splinters or they break when they come into contact with harder materials.
The solution that is proposed to increase the field of usage of the planer, avoiding the above mentioned problems and improving the quality of finish that it achieves, is to equip it with a cylindrical tool that, instead of holding the above-mentioned knives or blades, holds tubes covered with an abrasive material.
The problem that has been identified is that the above mentioned tubes, in this specific case, made in aluminium and covered with emery cloth, which is glued on, have variable external diameters to the extent of a few tenths of a millimetre because of a series of variables as follows:

differing grain of abrasive
differing supports for the abrasive
variable quantities and thicknesses of the glue used for fixing to the tube
the uneven wearing of the abrasive during use

To solve this problem and to return to the first of the key criteria for the correct functioning of the planer, that is the absolute and precise alignment of the rear plate and the tool, in this case abrasive, and because the tool is not mechanically adjustable, there is no other course of action except to make the rear plate adjustable in height, this rear plate usually being fixed.
The raising and lowering of the rear plate will be controlled by a mechanism (fig. 5) which will allow it to maintain a position that is always parallel to the front plate and tangential to the external diameter of the abrasive cylindrical tool (fig 2 & 3)
The new finding comprises:
An electric tool able to smooth surfaces by means of abrasion made up of: front plate for resting on surfaces (n° 1, fig. 1,2,3,4) adjustable in height able to determine the depth of material to be removed by the abrasive tube. Rear plate for resting on surfaces (n° 2 fig. 1,2,3,4) adjustable in height through a mechanism enabling it to work at a tangent, with its own ideal length, to the external diameter of the abrasive tube (n° 3 fig. 1,2,3,4) which will vary according to the grain, the type of abrasive and to the wear during use. The rear plate (n°2 fig.4) will have a width equal to or less than the width of the abrasive tube (n°3 fig.4) and will be aligned to the abrasive tube in a way that it will slide in the indentation left by the abrasive tube. Abrasive roller (n°3 fig. 1,2,3,4) placed between the above mentioned plates and powered in its rotation in a transverse horizontal axis in relation to the direction of manual advancement of the machine, the rotational direction being opposite to the manual direction of the machine.
Rear handle (n°4 fig.1) with switch. Front handle (n°5 fig. 1) with mechanism for adjusting the front plate. Electric motor (n°7 fig. 1), will transmit its movement to the operating roller by means of a belt and pulleys, or gears. Point of control of the mechanism to adjust the rear plate (n°8 fig. 1). Dust exhaust (n°9 fig. 1). Body of the machine consisting of one or more shells in plastic or aluminium having the function of incorporating or connecting all the other members and particulars of the machine.

Claims

ABRASIVE PLANER - EVOLUTION
Electric tool able to smooth surfaces by means of abrasion made up of: front plate for resting on surfaces (n° 1, fig. 1,2,3,4) adjustable in height able to determine the depth of material to be removed by the abrasive tube (n°3 fig 1,2,3,4). Rear plate for resting on surfaces (n° 2 fig. 1,2,3,4) adjustable in height through a mechanism enabling it to work at a tangent, with its own ideal length, to the external diameter of the abrasive tube, which will vary according to the grain, the type of abrasive and to the wear during use. This rear plate (n°2 fig.4) will have a width equal to or less than the width of the abrasive tube (n°3 fig.4) and will be aligned to the abrasive tube in a way that it will slide in the indentation left by the abrasive tube. Interchangeable abrasive roller (n°3 fig. 1,2,3,4) fitted onto a roller-carrier mechanism placed between the above mentioned plates and powered in its rotation in a transverse horizontal axis in relation to the direction of manual advancement of the machine, the rotational direction being opposite to the manual direction of the machine.
Rear handle (n°4 fig.1) with switch. Front handle (n°5 fig. 1) with mechanism for adjusting the front plate. Electric motor (n°7 fig. 1), will transmit its movement to the operating roller by means of a belt and pulleys, or gears. Point of control of the mechanism to adjust the rear plate (n°8 fig. 1). Dust exhaust (n°9 fig. 1). Body of the machine (n°10 fig 1).
Abrasive plane evolution (see claim 1) characterised by the fact that the aforementioned abrasive carrier/roller is accessible from one side in a way that allows an aluminum tube covered in abrasive material to be fitted onto it.
Abrasive plane evolution (see claims 1 & 2) characterised by the fact that the aforementioned toolholder/roller (fig 6) incorporates within itself a mechanical system for the expansion of rubber parts able to lock against the abrasive tube when this latter Is fitted onto it. In figure 6 we can in fact observe at n° 25 the aluminum tube, with abrasive material at n° 26 fixed to it, fitted and removable. At n° 27 the body of the roller/toolholder on which part n° 29 can slide, which by advancing towards the left pushed by the tightening of the ring nut n° 30 on the pin n° 23, will produce a deformation and a raising of the two O-rings n° 28 which will create a degree of friction sufficient to lock the abrasive sleeve to the sleeve-holder. To be noted also, part n° 22 ball bearings, one fixed to the side body of the machine (n° 21), the other fixed to part n° 24 overhang support fixed to the body of the machine. N° 23 pin of the roller whose rotation is transmitted by the motor by belt or by gears, n° 31 pair of O-rings which provide contact and guided sliding of the abrasive tube on the sleeve-holder.
Abrasive plane evolution (see claims n° 1, 2) characterised by the fact that the aforementioned toolholder/roller incorporates within itself a dynamic system to lock it against the abrasive tube when fitted and in rotation (see fig. 7). Slotting and pushing into its seat the abrasive sleeve (n° 25 & 26), the O-ring n° 35 will roll from right to left stopping as per the drawing (fig. 7) on the left side of the slot n.34 thereby fixing in position the abrasive sleeve. The rubber part (n°32 fig. 7 & 8), housed in the shape of the sleeve holder n°36, because of the effect of centrifugal force will deform and create pressure both towards the sleeve n° 25, and laterally towards the sides of its own seating, thus guaranteeing the locking of the abrasive sleeve during rotation. (N° 33 fig.8) rubber protrusion whose function is to centre the sleeve on the sleeve holder and to increase the friction between the two elements.
Abrasive plane evolution (see claims n° 1,2,3 or 4) characterised by the fact that the aluminum tubes (n° 25 fig.6 & 7) or other suitable material, covered in abrasive cloth or other abrasive material of various grains and types (n° 26 fig.6 & 7) are fitted onto its own toolholder.
Abrasive plane evolution (see claims n° 1,2,3 or 4 & 5) characterised by the fact that the rear plate (n°2 fig.1), is adjusted in height by means of a knob (n°8 fig.1) or screw (n°16 fig.5) which acts on a system of sliding plates with inclined surfaces (see fig.5) in which are reproduced the following parts in section: at n°10 body of the machine to which, by means of screws n°15, the other parts in fig.5 are connected. At n°17 sliding plate free to move forwards or backwards in relation to the axis of the machine, pushed by control screw or knob n°16. The said plate has within itself a series of small inclined surfaces n°11 which, by reacting against the inclined surfaces n°12 of the sliding plate n°2, cause a raising or a lowering. Part n°15 system assembly screws. Part n°14 distancing bush between body of the machine n°10 and plate n°2, which has the function of allowing both the high/low movement of plate n°2 and the forwards and backwards movement of plate n°17. Return spring n°13 allow plate n°2 to return towards the body of the machine n°10 when the screw n° 16 is slackened.
Abrasive plane evolution (see claims n° 1,2,3 or 4, 5 & 6) characterised by the fact that the said rear plate (n°2 fig 4) is in width equal to or less than the width of the abrasive tube when in working position (n°3 fig.4), so that it can rest on the surface created by the action of this latter.
Abrasive plane evolution (see claims 1,2,3 or 4,5, 6 & 7) characterised by the fact that the said abrasive roll holder is pivoted at both its ends.
Abrasive plane evolution (see claims 1,2,3 or 4, 5, 6 & 7) characterised by the fact that the abrasive roll holder is pivoted at a single end as per fig 6 and fig 7 in which can be seen (n°21 & 24) fixed parts of the body of the machine acting to support bearings n°22 on which rests the pin n°23 integral with parts n°27, n°28, n°29 and n°30 to which it transmits rotation, and whose function is to receive and to support the abrasive sleeve n°25 & 26.