ES2390545B2 - SANDING HEAD ADAPTABLE TO AN ORBITAL GRINDER - Google Patents

Abstract

Sanding head adaptable to an orbital grinder, which has a plate (1) provided on its front face with a termination (11) that integrates an internal threaded area (12) in which it is screwed and fixed to the axis (31) of the machine (3), and on its front face it has a peripheral discoidal surface (14) that constitutes the means of mechanical contact contact for a sanding disc (2) constituted by a system of loops and hooks type velcro. The plate (1) also has, in the center of said front face, an axial emergency (15), which reaches up to be placed inside an orifice (22) in the center of the sanding disc (2), in which it adapts facilitating its centering and support.

Description

Sanding head adaptable to an angle grinder.

5 Object of the invention

The present invention refers to a head

for a grinder machine of the type of which

10 comprises an electric motor that drives a threaded shaft on which it is mounted, or a radial disk that can be used to cut various materials (iron, stone, wood, etc.) and also as a sandpaper enough, which is immobilized by means of an outer nut that is tightened with a special wrench. It is also possible to mount on said drive shaft a head as a conical plate, of rubber or plastic, which bolts by the smaller base on said axis of the machine and has at its major base, 20 located towards the outside, a disc sandpaper, for

adapt the grinder as an angle sander.

In particular, the head of the invention refers to a head that allows easy mounting and dismantling of discs for sanding or polishing in a conventional grinder machine. This head has two well-differentiated parts, one part a plate that is provided with a termination through which it is screwed and fixed 30 on the machine axis, while its front face is provided with a joint surface

mechanically due to the act of a sanding disc, or formed

by sandpaper bonded together. From elsewhere,

a replaceable sandpaper disc that has mechanical contact junction means homologous to those of the head and its active front face, or is constituted by an abrasive surface of sandpaper, or formed by several discs of

sandpaper

United between yes from shape tangential with

respect

to a flat radial from saying disk, or by

Any other abrasive material.

Background of the invention

Currently there are sandpaper plates that are mounted in a grinder formed by a single body in the form of a conical plate, which is threaded into the axis of the machine and that externally have the disc of abrasive material. There is also a solution in which the sanding disc is mounted by itself on the axis of the grinder immobilized by the traditional nut that is tightened from the rear or outside area.

Any of these solutions implies that, when it is necessary to change the sanding disc or the complete plate, it is necessary either to unscrew the immobilized nut or the complete plate from the machine shaft and replace the new one.

On the other hand, both individual sanding discs and sandpaper plates have a flat operating surface, which poses problems when treating rounded surfaces since the disc wears unevenly, in addition to causing vibrations in the shaft of the machine that

hinder the operator's task and end up rendering the machine useless.

Description of the invention

The present invention has as its object a sanding head adaptable to an orbital grinder, which has a plate that has a cylindrical end on its rear face, generally provided with two flat cuts that define two parallel faces that constitute a driving means by means of a conventional key applied on said flat faces. Inside, it integrates a nut or defines a threaded cavity in which it is screwed and fixed to the axis of the grinding machine.

This plate has on its front face, opposite to that through which it is fixed to the grinder, a discoid surface, substantially flat, which constitutes the means of mechanical contact contact for a sandpaper disk or formed by several sheets of sandpaper joined together according to inclined diametral planes. For this purpose, the sanding disc has, by its rear face, facing the machine, means of mechanical connection by contact homologous to those existing in the head, constituting a bonding system between ties and sailboat hooks.

According

a important characteristic from the

invention,

he plate that dock in he axis from the

machine

has So same from a emergency axial,

directed towards the front face and reaches a sufficient height to be placed inside an existing hole in the center of the sanding disc, in which it adapts. This emergency allows centering and

5 securing the disc with the only sailboat-type means indicated above.

The sanding disc is a disc with a conventional configuration that is either formed by a sandpaper surface, or by sandpaper sheets joined together according to inclined diametral planes,

or for any other abrasive material. This disc can be flat or present on its active face, the opposite of the grinder, a certain taper in which the major base coincides with the previous face facing the machine. In any of the cases, the sanding disc has, in a preferred embodiment, the recessed center towards the rear face which is provided with the sailboat 20 for connection with the plate, just like this one; in this way the coupling between the axial emergence of the plate and the central hole of the sanding disc is carried out in a plane located subsequently, towards the machine, with respect to the work plane or zone

25 activates the sanding disc, so that in any working circumstance it does not interfere with the surface of the abrasive and does not affect the coupling.

Description of the figures

To complement the description being made and in order to facilitate the understanding of the features of the invention, it is accompanied

to the present specification a set of drawings in which, for illustrative and non-limiting purposes, the following has been represented:

The

figure one sample a view in section

cross

of the head, chief, engine head sander adapted in a

grinder machine

(3).

Figure 2 shows in a cross-sectional view a head with a sanding disc (2b) formed in this case by multiple sheets of sandpaper attached and inclined with respect to a diametral plane to said disk.

Preferred Embodiment of the Invention

As can be seen in the referenced figures, the sanding head of the invention allows adapting discs {2) of an abrasive material, preferably of sandpaper, whether it is a single element as shown in Figure 1, or constituted by several sheets ( 24) joined together according to inclined diametral planes, as seen in figure 2, to a grinding machine quickly

and simple, for which purpose the head consists of two pieces (1) and (2) that are joined

each other by means of a system of hooks and sailboat loops.

The piece (1), which we call the plate throughout this report, presents a central emergency (11) on the face facing the grinder

(3), which internally includes a surface

threaded or an embedded nut (12) through the

which is immobilized this piece in the screw (31)

which constitutes the axis of the machine. By his face

previous this dish has a surface (14) of

5

hooks or ties to be homologous to the

surface (21) existing in the replaceable disk

(2). In the central area and on the front side

has an emergency (15) that stands out

slightly through the central hole (22) of the disc

10

(2) exercising said emergency a work of

immobilization, while allowing centering

easily the disc (2) with respect to the plate (1).

This central area (13) is recessed so that

the coupling between the disc (2) and the plate (1) a

fifteen

through the hole (22) and the emergency (15)

make in a plane closer to the machine (3) than

the active surface (23) of the disk (2).

On the other hand the piece (2) is a disk

twenty

abrasive, sandpaper, similar to any disc

conventional. This disk has a surface

posterior (21) of loops or hooks, depending on the

existing in the plate (1) indicated with the reference

(14). The anterior surface (23) of this disc (2)

2S

a single sandpaper body is formed or by several

slats (24) located inclined with respect to the

plane that defines said operative face (23). For his

part of the hole (22) is placed in a recess (25)

towards the back face facing the plate (1), by

JO

The reasons mentioned above.

As shown in Figure 2, in this

case the disc (2) has an active face (23)

provided with a certain conicity placing its major base towards the back side and the lower one towards the center of the active face. This form allows working on non-flat surfaces with wear

5 more uniform of the sanding disc (2), since this shape adapts better on any surface without the tool vibrating with use, as with conventional discs.

10 Once the nature of the invention has been sufficiently described, as well as a preferred embodiment, it is stated for the appropriate purposes that the materials, shape, size and arrangement of the described elements may be modified,

15 provided that this does not imply an alteration of the essential characteristics of the invention claimed below:

Claims (3)

1.-Sanding head adaptable to an orbital grinder, which has a plate (l) provided on its front face with a termination (11) that integrates an internal threaded area (12) in which it is screwed and fixed to the shaft (31) of the machine (3), characterized in that said plate (1) has on its front face, opposite to that through which a peripheral discoidal surface (14) is constituted to the grinder, which constitutes the means of mechanical contact contact for a sanding disc (2), which has on its rear face, facing the machine, means of mechanical contact contact (21), homologues to those existing in the head (14), both consisting of a system of loops and hooks sailboat type; and, said plate (1) also presents, in the center of said front face, an axial emergency (15), which reaches up to be placed inside an orifice (22) existing in the center of the sanding disc (2), in the that adapts facilitating its centering and support. 2. Sanding head according to claim 1, characterized in that the sanding disc (2) has a recessed area (25) in the center towards the rear face provided with the mechanical joining means (21), which in the coupling with the plate (1) is located inside a central sunken area (13) existing in said plate, the coupling being made between the axial emergence (15) of the plate (1) and the central hole (22) of the sanding disc (2) in a plane located subsequently, towards the machine, from the work plane or active zone (23) of the sanding disc (2). 3.-Sanding head, according to claims 1 and 5 2, characterized in that the active (23) or posterior side of the disc (2), consisting of a surface of sandpaper or tapered by sheets of sandpaper (24) joined together and inclined with respect to the plane defining said rear face, presents a 10 certain conicity, with its major base coinciding with the rear face facing the machine.