Hole saw with internal friction removal system for ejecting waste

Abstract

The present invention discloses a rapid eject hole saw having a serrated shape at the top and being provided with a projection on its inner face, the saw being provided with a guide drill bit which includes a projection on its surface, so that the projection of the guide drill bit is aligned in the same direction as the inner projection of the crown. Advantageously, the defined configuration allows the external projection of the drill bit to also reach the surface at the same time as the top of the crown reaches the surface, and initiates the process of tearing the material to be drilled around the guide drill bit to thus create a gap between the guide drill bit and the waste disc of the drilled material.

Description

[0001] Title of the invention

[0002] Hole saw with internal friction elimination system for waste emptying

[0003] Technical field of the invention

[0004] The present invention relates to a round, circular or hole saw for drilling designed for circular cutting on surfaces, with a system for eliminating the friction that occurs between the waste and the interior surfaces, which has at least one projection strategically located inside the crown that preferably acts together with at least one other projection located on the surface of the guide drill bit, thus eliminating friction, and avoiding the entrapment of the material inside the crown, so that when the cutting process is finished, the excess material of the perforated element housed inside the crown is released effortlessly and with hardly any manipulation.

[0005] Background of the invention

[0006] In the construction and carpentry industries, the use of drywall or gypsum board, and wood or similar surfaces, has become increasingly common due to their ease of installation and versatility. However, during the cutting process of these materials, challenges have arisen regarding clogging and debris buildup on traditional cutting tools, such as hole saws. This can affect working time, efficiency, and cut quality, as well as tool durability.

[0007] Many brands and companies manufacture hole saws for making the necessary holes for running conduits, installing electrical boxes, and installing lighting. These holes are made in a variety of materials, such as drywall, fiber cement, plaster, wood, plastics, metals, and more.

[0008] The operation is simple. Its hollow tubular shape, with teeth on the top that give it a saw-like shape, cuts or abrades the material being drilled until it penetrates the surface in which the hole is being made. They have a guide drill bit that is responsible for maintaining the hole saw's cutting process. A drilling machine or motor provides the necessary rotation so that the hole saw rotates as it approaches the surface to be drilled. The teeth of the hole saw nick the surface, thus producing the perimeter cut until it reaches the desired depth or penetrates the surface to be drilled.

[0009] Once the hole is made, the waste disc created is trapped inside the crown, forming a plug. In most cases, it is very difficult to remove and requires the use of auxiliary tools to leverage it out, such as a screwdriver, and thus detach the cut waste disc from the crown and thus be able to use it again for a new hole or drill.

[0010] Some hole saws have a spring inside the base around the guide bit, designed to exert pressure on the residual piece outward, ejecting it once the hole is drilled. The problem with this type of solution is that, after several holes have been drilled, the interior of the hole saw deteriorates due to the adhesion of residual plaster dust to its inner surface. This causes the residual cutting disc to slow down, becoming stuck or retained inside the hole saw, as the spring is not strong enough to eject it.

[0011] Patent EP 2800645 presents a tool that can adjust the depth of the drill guide bit and also has an ejector that, by means of a lever, pulls the plug or disc cut by the crown, generally stuck inside. In this specific case, the process of use will be to drill a hole in the surface and, once done, it is necessary to act on a lever to apply pressure and cause the plug ejector to eject the plug from the cut material.

[0012] Other inventions proposed to solve the problem of extracting material from the inside of hole saws consist of different methods of pushing, disassembling or moving the hole saw, which are not useful due to the number of manual or mechanical actions required by the operator to extract the plug from the hole.The solution found by the inventors allows the cut to be made using the hole saw and, once the operation is completed, the waste disk or plug created after the cut can be easily emptied without the use of any tools, mechanisms, external elements or movement of the different pieces and without manipulation. This is done by simply tilting the hole saw and placing it with its upper part facing downwards, thus allowing the waste to fall by its own weight, eliminating friction thanks to the gap or separation distance created between the perimeter surface of the waste disk and the inner face of the hole saw, which prevents it from getting stuck. In addition, the hole saw can be fitted with a guide drill bit that has a system that provides sufficient clearance between the drill bit and the waste plug, and which prevents the material from rubbing or braking, and thus does not get stuck inside the hole saw.

[0013] Description of the figures

[0014] Figure 1 shows a perspective view of the complete tool assembled for use. The assembly consists of a crown, standard spindle, and drill bit.

[0015] Figure 2.- Shows a side view of the tool consisting of the crown, the guide drill and the standard spindle.

[0016] Figure 3.- Shows a perspective view of the crown from its upper part.

[0017] Figure 4.- Shows a detailed view of the inner projection of the crown located in the cutting area of ​​the crown saw.

[0018] Figure 5.- Shows a perspective view of the crown from its lower part.

[0019] Figure 6.- Shows a view of the guide drill bit with the outer protrusion on its surface.

[0020] Figure 7.- Shows a detailed view of the outer protrusion of the drill bit.

[0021] Figure 8.- Shows a perspective view of the standard spindle.

[0022] Definitions The term “tool” (fig. 1) refers to the entire set of parts including the standard spindle.

[0023] The term “crown” (fig. 3) refers to the tubular piece with teeth or a saw-like shape at the top, closed at the bottom and preferably shaped to receive a spindle for standard crowns.

[0024] The term "pilot drill" (Fig. 6) refers to the drill bit that initiates the drilling process and holds the core bit firmly against the surface. It attaches to the standard spindle.

[0025] The term “standard spindle” (fig. 8) is the part or tool that couples the crown and the drill bit to the drilling machine.

[0026] The term “upper part” (2) is where the toothed or saw-shaped part is located, which will be responsible for making the drill or hole in the desired surface.

[0027] The term “saw” (2) refers to the saw-like shape or saw teeth found on the top of the crown, this part of the tool is the one that performs the drilling or perforation on the desired surface.

[0028] The term "lower part" (8) refers to the part opposite the upper part. This part will preferably be shaped to receive a crowning spindle so that they can be joined together and thus be able to attach the tool to a drilling machine.

[0029] The term “outer face” (4) refers to the outer part of the tubular shape of the crown. This face is what will determine the diameter of the cut.

[0030] The term “inner face” (3) refers to the inner part of the crown which is the part opposite to the outer face of the tubular piece.

[0031] The term "inner projection" (1) refers to the projection from the inner face toward the inside of the crown. This part is responsible for tearing the cut inward to create the gap between the waste disc and the inner profile of the crown, eliminating friction between surfaces and facilitating its removal.

[0032] The term “external projection” (6) refers to the projection that exists on the guide drill from the drill surface to the outside. This part is responsible for tearing the cut outwards to create the separation gap between the drill surface and the waste disc to avoid friction when the waste disc is ejected from the guide drill.

[0033] The term “drilling machine” refers to any tool, implement, or motor capable of providing sufficient torque to the tool to drill or bore a hole in the surface.

[0034] The term “waste” refers to the excess material from the drilled surface or fragments of drilled surface material that remain inside the core bit after drilling.

[0035] Description of the invention

[0036] The invention consists of a special hole saw and drill bit, preferably designed for cutting drywall. These tools have innovative features that prevent debris or excess material from becoming trapped inside the tool during the cutting process by eliminating contact between surfaces.

[0037] In the hole saw (fig. 3), a system has been incorporated that eliminates friction between surfaces, reducing the diameter of the waste and / or the perimeter of its outer surface. This system contains at least one internal projection (1) strategically located on the upper part of its inner face (3). It will preferably be pointed or arrowhead shaped pointing towards the inside of the crown. For optimal operation, the projection (1) must be aligned in height with the upper part of the crown (2) although the function will be similar if the internal projection (1) protrudes from the upper part of the crown or if it is offset towards the bottom.

[0038] In a first aspect of the invention, the projection (1) is pointed but can also be of any shape and length that the expert considers or is needed according to the requirements of the material to be drilled. The system can be carried out by bending or tilting inwards at least one of the saw teeth (2) of the crown, thus forming an internal projection (1) that, through its action during cutting, reduces the perimeter of the waste.

[0039] This inner projection (1) acts as a cutting and / or tearing blade that creates a gap or space between the inner face (3) of the crown and the waste, reducing the radius of the waste and preventing fragments of material and / or waste from becoming trapped inside the crown by eliminating contact and / or friction between the inner surface (3) of the crown and that of the waste. In this way, the saw crown can cut more efficiently and precisely, improving the quality of the work and reducing the need for interruptions to clean the tool, thus saving time in the work process.

[0040] On the other hand, the drill bit (Fig. 5) may also have an external projection (6) on its surface. Preferably, it is pointed or shark fin shaped and preferably vertically aligned with the internal projection (1) of the hole saw. This projection performs a similar function to its counterpart on the hole saw, in this case, expanding the internal perimeter of the hole for the excess material made by the drill bit (Fig. 5) and avoiding contact and / or friction between the two surfaces. In addition, it is responsible for preventing the adhesion and accumulation of excess material on the drill bit during the drilling process. By preventing the material from adhering to the surface of the drill bit (Fig. 6) or being slowed down by friction with it, its extraction is facilitated, even after a considerable number of holes have been drilled. This contributes to maintaining work efficiency and prolonging the useful life of the drill bit.

[0041] This projection may point in any direction, but preferably, for a better result when removing the waste disc or plug, the projection of the guide drill bit should be aligned in the same direction and sense as the inner projection of the hole saw. The projection of the guide drill bit (6) may be of the form determined by the expert for an optimal result. Alternatively, the system may be in a single piece, formed by the crown (fig. 3) and a guide drill bit (fig. 6) that protrudes from the bottom of the crown and allows it to receive the drilling machine.

[0042] Operation In a first aspect of the invention, once the tool is placed in the drilling machine, the tool would be ready to make the hole in the selected surface. The tip of the guide drill bit (fig. 6) is placed on the surface and drilling begins. The guide drill bit starts the drill perpendicular to the surface, making the crown remain perpendicular and avoiding lateral movements of the crown itself. When the upper part (2) of the crown reaches the surface, the saw teeth make the cutting groove in the surface and in turn, the system for reducing the perimeter of the excess material, thanks to the inner projection (1) of the crown, expands the inner perimeter of the groove, thus creating a separation space between the inner face (3) of the crown itself and the outer perimeter of the waste disc created by the cut.

[0043] During the same process, at the moment that the upper part (2) of the crown reaches the surface, the external projection (6) of the drill bit also reaches the surface and begins the process of tearing the material to be drilled around the guide bit to thus create another gap between the guide bit and the disc of waste of the drilled material. These two spaces created, the groove between the crown and the waste, and the groove between the guide bit and the waste, allow the remaining waste disc of the drilled surface material not to rub, providing clearance and mobility, remaining loose and without pressure both on the inner surface (3) of the crown and on the surface of the drill bit.This allows the disc to be easily released without manipulation by the operator, tilting the crown with its upper part (2) towards the ground, the remaining disc of the drilled residue on the surface will fall by its own weight or failing that, by a slight movement or pressing the drill drive so that the crown rotates and helps the plug slide and exit from inside the crown. In this way the crown will be ready to perform a new drill without the need to manipulate or disassemble any element.

Claims

Claims 1. A quick-cutting hole saw characterized in that it has a saw-like shape in its upper part (2) and has at least one projection (1) on its inner face (3), the saw having a guide drill bit (5) with at least one projection (6) on its surface, such that the projection (6) of the guide drill bit is aligned in the same direction and sense as the inner projection (1) of the crown.

2. Quick-cut hole saw according to claim 1, characterized in that the outer projection (6) of the guide drill bit is aligned in depth with the upper part (2) of the tool.

3. Quick-emptying hole saw according to claim 1, which in its lower part (8) has the appropriate shape (9) to be housed in a standard spindle for hole saws.

4. Quick-empty hole saw according to claim 1, which in its lower part (8) has the appropriate shape to receive a drilling machine, electric screwdriver or motor capable of making it rotate enough to drill the hole in the desired surface.

5. Quick-cut hole saw according to claim 1, made of a single piece, consisting of the crown and a guide drill bit that protrudes from the lower part of the crown and allows the drilling machine to be received.

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