FR3073166A1 - ROLLER WITH FUNCTIONAL SURFACE FOR ELECTRIC TOOL AND ELECTRIC TOOL PROVIDED WITH SUCH ROLL - Google Patents

Abstract

Roller (2) with a functional surface for a power tool with a rotary drive, comprising a hub (3) whose hollow cylindrical body has a hollow central portion (31) which is intended to constitute the mounting portion (contact) of the roll on the tool for which the roller is intended, characterized in that the central portion (31) comprises means for mutual engagement cooperation (30A, 30B) of the type of male or female cooperation means adapted and adapted to cooperate with means of complementary shape (13A, 13B) of a shaft (12) rotating the tool on which is intended to be mounted the hub.

Description

ROLLER WITH FUNCTIONAL SURFACE FOR POWER TOOL AND POWER TOOL HAVING SUCH A ROLL

The invention relates to the field of power tools using a cylindrical functional element such as a roller or a brush, the cylindrical functional element being capable of being removably mounted on a rotary shaft of the tool.

The invention will be more particularly described with regard to a device for renovating a portable surface or not, without however being limited thereto. It applies to any electric device / tool with a slender rotary shaft and on which is intended to be removably mounted a functional element / an accessory of elongated shape so as to ensure its rotation, the functional element having a DIY functional external surface.

In the following description, a surface renovation device is also called a surface renovator.

The surface renovator is a tool used to strip, brush, renovate surfaces, such as wooden or metal surfaces, using a rotary cylindrical element such as a brush or a rotary roller.

In the following description, the term “roller” means any roller, brush, cylindrical element having a functional external surface, such as an active friction surface which is adapted to the type of surface to be renovated. For example, the active surface of the roller may be based on felt, or on abrasive paper (with continuous surface or in the form of strips), or else provided with plastic or metallic brush bristles, etc. A roller surface renovation tool comprises in a known manner a body housing electric drive means of the electric motor type, and the distal end of which forms gripping means, and transversely to the body, a slender rotary shaft on which is removably mounted at least one rotary cylindrical renovation element of the roller type, the roller being able to rotate in rotation via the rotary shaft driven by the electric drive means; a safety casing is generally also provided to partially cover the roller from a distance.

Today, to ensure a removable mounting of the roller on the shaft, on the one hand the roller has a longitudinal central recess forming a hub, and on the other hand, the tool shaft is provided with two opposite grooves , while two added longitudinal keys are provided which are of complementary shape to the grooves to be inserted into said grooves of the shaft when the roller hub is associated with the shaft. Thus, the mounting of a roller is done as follows: the hub of the roller is threaded on and around the shaft until it comes into abutment near the proximal end of the shaft (body side of the 'tool), then the two keys are slid into the grooves, which secures the roller to the shaft, and finally a washer and a clamping screw are fixed on the free end of the shaft to lock the roller in position .

This removable fastening design has drawbacks. In particular, it is not so quick to implement, because it requires putting the keys in place and then bolting the end of the shaft. In addition, the keys are attachments that can easily be lost during disassembly.

Certainly, according to the roller models, in particular for the rollers whose hub is metallic and not plastic, the washer and the clamping screw are sufficient by lateral compression to lock the hub around the shaft, however, this fixing does not only suitable when one roller is mounted on the shaft. Indeed, for large area renovators, it is necessary to mount two consecutive rollers on the shaft, and lateral compression by bolting on the free end of the shaft is insufficient to secure the two rollers on the shaft . In the latter case, keys are essential.

The invention therefore aims to overcome in particular the aforementioned drawbacks by providing a roller for an electric tool with rotary drive of said roller, which allows it to be easy and quick to assemble and disassemble on the tool, whatever the type of roller. with metal or plastic hub, and the number of rollers to be mounted consecutively on the same shaft, while guaranteeing an effective fastening of the roller on the tool shaft. The invention also relates to an electric tool provided with such a roller, in particular a device for renovating the surface with a roller.

In the following description, the expression “electric roller tool” is understood to mean an electric tool capable of rotating a functional element of cylindrical shape to perform a DIY task.

According to the invention, the roller with a functional surface for an electric tool with rotary drive comprises a hub, the hollow cylindrical body of which has a hollow central part which is intended to constitute the mounting (contact) part of the roller on the tool to which is intended for the roller, characterized in that the central part includes means of cooperation by mutual engagement of the type of male or female cooperation means capable and intended to cooperate with means of complementary shape of a rotary shaft of the tool on which is intended to be mounted on the hub.

According to one characteristic, the means of cooperation by mutual engagement are means integrated into the body of the hub. The term “integrated means” means means which form a monobloc unit, unitary with the body of which they are integral, on the contrary of added means which are independent. The means of cooperation by mutual engagement form an integral part of the body of the roller at the end of manufacture of the roller. Consequently, the roller is marketed with said means of cooperation by mutual engagement integrated into the body of the roller in order to mount the roller on the tool by directly securing the roller without the need to bring in independent fixing parts.

Thus, the principle of securing the roller to the tool shaft is simpler to implement and faster compared to the system of the prior art, and advantageously makes it possible to dispense with keys, in particular avoiding any risk. lose them for the user.

According to one characteristic, the means of cooperation by mutual engagement extend longitudinally to the hollow central part of the hub, in particular all along the hollow part while being set back (inwardly hollow) relative to the edges of the hub .

According to one embodiment, the means of cooperation by mutual engagement comprise two diametrically opposite longitudinal ribs projecting towards the hollow interior of the central part of the hub. Preferably, the central part of the hub with the means of cooperation by mutual engagement and the rest of the body of the hub form a one-piece assembly made of plastic, in particular made by molding. Depending on the size of the thickness of the hub, the hub (the body of the hub) may have recesses in its thickness.

According to another embodiment, the hub comprises a peripheral part which envelops and is integral with the central part, the peripheral part being made of metal while the central part is made of plastic material preferably made by molding and glued to the peripheral part in metal.

The roller has a functional external surface forming an active friction surface, in particular for surface renewal such as based on synthetic or metallic fibers, or on abrasive paper.

The invention also relates to a power tool with a rotary functional element / accessory of the roller type, in particular of the type with surface renovation function, comprising a slender shaft with rotary drive which is provided with cooperation means for mounting at least a roller, and at least one aforementioned roller of the invention, the means of cooperation by mutual engagement of the roller cooperating with said means of cooperation of the shaft in complementary forms.

Advantageously, it comprises locking means guaranteeing that the roller is held in position, in particular lateral tightening means such as by bolting which are arranged at the free end of the shaft once the roller is in position on the shaft. As a variant, the locking means can be associated with the cooperation means by mutual engagement, by providing a clipping function.

By "lateral" in the following description is meant the qualifier with respect to a plane transverse to the longitudinal axis of the roller or of the tool shaft.

In a particular embodiment, the tool shaft comprises two diametrically opposite longitudinal grooves, and said at least one roller comprises two opposite longitudinal ribs (symmetrically with respect to the longitudinal axis of the hub) as means of cooperation by mutual engagement, which cooperate with (are engaged in) respectively the two opposite grooves of the shaft.

The present invention is now described using examples which are only illustrative and in no way limit the scope of the invention, and from the attached illustrations, in which:

Figure 1 is a perspective view from above of an example of a power roller tool according to the invention without its protective casing;

Figure 2 shows Figure 1 without the roller;

Figure 3 is an isolated perspective view of the tool shaft;

FIG. 4A is a perspective view of a first type of roller provided with a hub according to the invention;

Figure 4B is a perspective view of the hub of Figure 4A;

Figure 5 is a side sectional view of the roller of Figure 4A mounted on the tool shaft;

FIG. 6A is a perspective view of a second type of roller provided with an alternative embodiment of a hub according to the invention;

Figure 6B is a perspective view of part of the hub of Figure 6A;

Figure 7 is a side sectional view of the roller of Figure 6A mounted on the tool shaft;

Figure 8 is a side sectional view of another alternative embodiment of a hub according to the invention.

The figures are not to scale.

The rotary drive electric tool 1 of the invention illustrated in FIGS. 1 and 2 is a roller electric tool 2 making it possible to rotate the roller 2 at high speed and having a functional surface 20.

By way of example, this tool is a surface renovator, the roller 2 having its functional surface 20 as an active renovation surface.

Figure 1 has been simplified by not drawing the protective casing, which is usually arranged at a distance and above the roller for this type of tool, in order to hide the roller from the user to prevent him from receiving it. dust from pickling during operation of the roller.

The tool 1 comprises at least one elongate body 10 housing electrical means of rotary drive such as an electric motor and constituting by one of its distal ends 11 a means for gripping the tool, and a shaft 12 ( Figures 2 and 3) opposite the end 11 and adapted to be rotated by the motor. The shaft 12 extends transversely to the elongate body 10. It is of elongated shape and comprises cooperation means for mounting / securing the roller, which are formed by two longitudinal grooves 13A and 13B symmetrically opposite with respect to the longitudinal axis of the tree.

The tool 1 comprises at least one roller 2 removably mounted on the shaft 12. For a large area renovator, the tool generally comprises two rollers mounted consecutively on the shaft. The roller 2 has its active renovation surface 20 over the entire periphery of its cylindrical body, this surface being made of a material suitable for the type of surface to be renovated.

The roller 2 is intended to be changed when its active surface 20 is worn out.

With reference to FIGS. 4A to 8, the roller 2 has a hub 3 allowing said roller to be threaded onto the shaft 12.

According to the invention, the hub 3 comprises integrated means 30A, 30B of mutual cooperation which cooperate directly by mutual engagement with cooperation means integrated into the shaft 12, in this case with the grooves 13A and 13B of the shaft . The means of cooperation by mutual engagement 30A, 30B of the roller and the means of cooperation 13A, 13B of the shaft are of complementary shape. The mutual cooperation means 30A, 30B and 13A, 13B make it possible to secure the roller 2 to the shaft 12. To lock the fixing of the roller, the tool 1 comprises clamping means 4 (FIG. 1), such as a washer 40 and nut 41, which are screwed onto the free end 12A of the shaft via a bore 12B, thereby compressing the roller 2 laterally.

The roller 2 and therefore the hub 3 have a length for example of 100 or 200 mm. For large area renovators, the tool has two rollers 2 butted at one of their side faces.

FIGS. 4A and 6A respectively illustrate two types 2A and 2B of a roller according to the invention, the material or materials constituting the hub 3 being different depending on the material of the active surface 20.

The first type of roller 2A is a roller whose hub 3 is made of a one-piece body entirely of plastic material comprising a hollow cylindrical central part 31 (FIGS. 4A and 4B), while the active surface 20 is made of synthetic fibers or sandpaper strips, the fibers or strips being directly bonded to the external plastic surface 31A of the hub.

The other type of roller 2B is a roller which has an active surface 20 of metal fibers / filaments, while the hub 3 is in two parts, a first hollow cylindrical central part 32 which is made of plastic (FIGS. 6A and 6B). , and a second part or peripheral part 33 (FIG. 5a) which envelops the central part 32 and is made of metal, the metal fibers being in particular fixed by crimping on the external surface 33A of the second part 33. The peripheral part 33 constitutes a cylinder hollow metallic of smooth homogeneous internal surface 33B without projection against which the external surface 32A of the central part 32 is glued.

According to the invention, the central part 31, 32 of each type of hub 3 is therefore made of plastic, and includes / integrates the ribs 30A and 30B.

FIG. 4B shows the embodiment of the hub 3, the body of which is entirely molded in plastic material; the diameter of the hub 3 made entirely of plastic is for example of the order of 50 mm.

In addition, the body advantageously has, in its thickness over the entire length of the cylindrical body, between its central part 31 and its external surface 31A, recesses 34. The recesses 34 make it possible to save in manufacturing material cost, and weigh down less the weight of the roller, contributing to better rotary training. These recesses are arranged symmetrically with respect to the longitudinal axis of the cylindrical body of the hub.

FIG. 8 illustrates an alternative embodiment of the plastic hub 3 with recesses 34 of different shape.

As for the metal-based hub 3 (FIGS. 6A, 6B and 7), once the central part 32 of plastic material is manufactured as illustrated in FIG. 6B, this is made integral by its external surface 32A of the inside 33B of the metal cylinder of the peripheral part 33, for example by gluing. The thickness e of the central part 32 (FIG. 6B) can be reduced, for example of the order of 1.5 mm. The diameter of the central part is for example of the order of 22 mm. For existing metal hubs, the central part 32 therefore constitutes a cylindrical interface part integrated into the hub and provided with co-operating ribs 30A and 30B with the tool shaft.

According to the invention, each central part 31, 32 of the hub 3 therefore comprises two longitudinal ribs 30A, 30B diametrically opposite opposite one another towards the hollow interior of said central part. The shape of the ribs 30A and 30B has a form of mutual cooperation with that of the grooves 13A and 13B of the shaft 12.

As illustrated by way of nonlimiting example in FIGS. 3, 5 and 7, the grooves 13A and 13B of the shaft have a U-shaped section.

The hub 3 of the roller of the invention therefore has male shapes (ribs 30A and 30B) for cooperating with the female shapes (grooves 13A and 13B) of the shaft 12; this embodiment effectively makes it possible to cooperate with the rotary shafts existing on the market which are usually provided with female shapes.

Of course, the hub 3 of the roller of the invention can conversely integrate female shapes to cooperate with male shapes integrated into the rotary shaft 12 of the tool.

According to the invention, the ribs 30A and 30B of the central part 31, 32 of each hub are obtained by molding the body 30 or the central part 32 of plastic.

The dimensions of the ribs 30A and 30B are designed so that the ribs cooperate with the grooves 13A and 13B according to a slight clearance, preferably of the order of 0.4 mm for each rib / groove.

The ribs 30A and 30B preferably extend along the entire length of the hub 3.

Advantageously, the ribs 30A and 30B of the central part 32 (FIG. 6B) which are therefore internal to the cylindrical body do not protrude relative to the lateral faces / end edges 35 of said central part 32 in order to avoid, if at on the contrary, they were flush with the edges, any risk of friction of the ribs of two lateral faces opposite two respective rollers which would be abutted to each other, to guarantee a rotary drive without discomfort of the two rollers. In particular, the ribs 30A and 30B are set back towards the inside of the hub with respect to each edge / side face 35.

Claims (11)

1. Roller (2) with a functional surface (20) for an electric tool with rotary drive, comprising a hub (3) comprising a hollow central part (31, 32) which is intended to constitute the part for mounting the roller on the tool for which the roller is intended, characterized in that the central part (31, 32) comprises means of cooperation by mutual engagement (30A, 30B) of the type of male or female cooperation means capable and intended to cooperate with cooperation means of complementary shape (13A, 13B) of a rotary shaft (12) of the tool on which the hub is intended to be mounted. 2. Roller according to claim 1, characterized in that the means of cooperation by mutual engagement (30A, 30B) extend longitudinally to the hollow central part (31, 32) of the hub, in particular all along the hollow part while being set back from the edges (35) of the hub. 3. Roller according to claim 1 or 2, characterized in that the means of cooperation by mutual engagement (30A, 30B) comprise two diametrically opposite longitudinal ribs projecting towards the hollow interior of the central part (31, 32) of the hub . 4. Roller according to any one of the preceding claims, characterized in that the central part (31) of the hub with the means of cooperation by mutual engagement (30A, 30B) and the rest of the body of the hub form a one-piece assembly of material. plastic, in particular made by molding. 5. Roller according to the preceding claim, characterized in that the hub has in its thickness recesses (34). 6. Roller according to any one of claims 1 to 3, characterized in that the hub (3) comprises a peripheral part (33) which envelops and is integral with the central part (32), the peripheral part (33) being made of metal while the central part (32) is made of plastic, preferably made by molding and glued to the peripheral metal part. 7. Roller according to any one of the preceding claims, characterized in that it has a functional external surface (20) forming an active friction surface, in particular for surface renovation such as based on synthetic or metallic fibers, or sandpaper. 8. Power tool (1) with rotary functional element (2) of the roller type, in particular of the type with surface renovation function, comprising a slender shaft (12) with rotary drive which is provided with cooperation means (13A, 13B) for mounting at least one roller, and at least one roller (2) according to any one of the preceding claims, 5 the cooperation means by mutual engagement (30A, 30B) of the roller cooperating with said cooperation means (13A, 13B) of the shaft in complementary forms (13A, 13B). 9. Power tool according to the preceding claim, characterized in that it comprises locking means (4) ensuring the maintenance in position of the roller, in particular 10 lateral clamping means (40, 41) such as by bolting which are arranged at the free end of the shaft (12A) once the roller in position on the shaft. 10. Power tool according to claim 8 or 9, characterized in that the shaft (12) comprises two longitudinal grooves (13A, 13B) diametrically opposite, and said at least one roller comprises two longitudinal ribs as means of cooperation 15 by mutual engagement, which cooperate respectively with the two opposite grooves of the shaft.