Reaming tool for a plastic pipe
The boring tool allows cutting the male end flush with the female end of plastic pipes, preserving length and avoiding cuts, while using a common support for multiple tools, addressing the challenge of repairing leaks without shortening the pipes and reducing manufacturing costs.
Patent Information
- Application Number
- FR2024005421
- Authority / Receiving Office
- FR · FR
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-05-27
- Publication Date
- 2025-11-28
AI Technical Summary
Existing methods for repairing leaks in plastic pipes, particularly PVC pipes, often require cutting the glued ends, which can lead to insufficient length for connecting sleeves, especially when elbows or tees are present, necessitating a solution that avoids cutting the interlocking and glued ends.
A boring tool with a body having two cylindrical sections and a cutting blade, allowing the male end to be cut flush with the female end, preserving the pipe length and enabling centering and cutting without separating the ends, along with a common support for multiple tools to reduce manufacturing costs.
Enables repair of plastic pipes without shortening them, maintaining pipe length for connectors, and reduces manufacturing costs by using a shared support for various tools, facilitating efficient and cost-effective repairs.
Smart Images
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Abstract
Description
Title of the invention: Boring tool for a plastic pipe technical field
[0001] The invention relates to a boring tool for a plastic pipe.
[0002] It relates more particularly to a boring tool for boring the inside of a female end of a plastic pipe into which a male end of another plastic pipe is glued.
[0003] The invention finds a favorite, and not limiting, application in the field of plumbing, for the repair of a plastic pipe used for water supply or water drainage, and in particular a polyvinyl chloride or PVC pipe. Previous technique
[0004] It is known that two plastic pipes, and in particular two PVC pipes, can be joined end to end by gluing. To do this, the first plastic pipe has a so-called female end while the second plastic pipe has a so-called male end designed to be fitted inside the female end of the first pipe; the male end having an external diameter substantially equivalent to the internal diameter of the female end.
[0005] Before joining, the female end is coated internally with glue and / or the male end is coated externally with glue, so that the two ends are joined and glued together. This is referred to as a fitting between two pipes.
[0006] However, in the plumbing field, it is often necessary to repair leaks in such plastic pipes, and sometimes at a joint between two pipes. Such a repair sometimes requires cutting the two joined and glued ends, and then inserting a connecting sleeve; the two ends cannot, in fact, be separated from each other.
[0007] However, it is sometimes very problematic to cut the two fitted and glued ends, particularly due to the length available for the connecting sleeve.
[0008] Indeed, such a sectioning inevitably leads to shortening the two pipes, and once these two ends are cut, one of the two pipes may not have sufficient available length to receive a connecting sleeve, for example because of an elbow or a tee that is too close. [Summary]
[0009] The invention aims to address this problem by proposing a solution that avoids having to cut the two interlocking and glued ends.
[0010] To this end, the invention proposes a boring tool for a plastic pipe, comprising: - a body having successively a first cylindrical section and a second cylindrical section centered on a central axis, in which the first cylindrical section has a first diameter and the second cylindrical section has a second diameter that is smaller than the first diameter, and in which a notch is made in the body on the first cylindrical section and on the second cylindrical section; and - a cutting blade fixed on the first cylindrical section of the body, at the level of the notch, in which said cutting blade has a cutting edge substantially flush with a periphery of the first cylindrical section for a bore along substantially the first diameter; in which the first cylindrical section has a plate, opposite the second cylindrical section, and in which are tapped holes for fixing by screwing onto a support.
[0011] Thus, a plumber will be able to cut the male end of the second plastic pipe flush with the female end of the first plastic pipe. A portion of the male end will then remain stuck inside the female end.
[0012] The plumber can then use the boring tool by fitting the second cylindrical section inside this portion of the male end; the second diameter being substantially equivalent to the internal diameter of this male end. The second cylindrical section thus allows for centering of the boring tool.
[0013] The plumber can then rotate the boring tool so that the cutting blade planes the portion of the male end; the first diameter, or boring diameter, being substantially equivalent to the internal diameter of the female end. By advancing the boring tool, it completely planes the portion of the male end, so that at the end the female end essentially returns to its initial state, that is, its state before the insertion and gluing of the other plastic pipe.
[0014] Thus, once the boring is complete, the female end of the first plastic pipe can again receive the male end of another plastic pipe.
[0015] Thanks to this boring tool, the plumber did not have to cut the first plastic pipe, which is advantageous if this first plastic pipe was too short and did not offer any available length for a connecting sleeve.
[0016] Furthermore, providing tapped holes in the plate of the first cylindrical section allows the use of a single support, which will be common to several boring tools having distinct bore diameters (or first diameters); a such a support having a coupling shaft then used for connection with a drill.
[0017] This embodiment is particularly advantageous because it allows several boring tools to be manufactured without the need for a coupling shaft with a drill, thus reducing manufacturing costs and bulk.
[0018] The cutting edge is substantially flush with the periphery of the first cylindrical section, in the sense that it is either flush with the periphery of the first cylindrical section or it protrudes at most one or two millimeters beyond the periphery of the first cylindrical section. Thus, this cutting edge allows boring along substantially the first diameter, that is to say, along the first diameter or along the first diameter increased by a maximum of one or two millimeters.
[0019] According to one feature, the body has a stud protruding from the plate of the first cylindrical section, the tapped holes being provided around said stud.
[0020] Such a stud allows centering on the support, which will present a cavity complementary to this stud.
[0021] According to one possibility, the block is cylindrical and has a third diameter smaller than the first diameter, or has a shape that is not of revolution.
[0022] According to another possibility, the body is made of a plastic material, a composite material, a resin-based material or a metallic material.
[0023] According to another possibility, the body is a single piece.
[0024] Thanks to the realization of the boring tool, it is possible to design the body by molding, machining or 3D printing.
[0025] According to another feature, the boring tool comprises a cylindrical saw formed of a toothed band which is detachably fixed on the periphery of the first cylindrical section of the body.
[0026] Thus, the boring tool makes it possible to offer an additional function, that of being able to make a circular cut by means of such a cylindrical saw, equivalent to a hole saw, which has a sawing diameter equivalent to the first diameter.
[0027] This cylindrical saw can be fixed for such sawing, and then it can be detached to perform its main boring function using the cutting blade. The first cylindrical section of the body also provides stable support for the circular saw.
[0028] According to one option, the cylindrical saw protrudes from the first cylindrical section, and surrounds the second cylindrical section, and this second cylindrical section protrudes axially from the cylindrical saw.
[0029] Thus, the second cylindrical section allows for centering or indexing in order to guide and center the cylindrical saw.
[0030] According to another option, the boring tool comprises a drill bit in the extension of the second cylindrical section and coaxial with the central axis.
[0031] This drill bit serves to guide and center the cylindrical saw; it is rotationally fixed to the body and therefore also to the cylindrical saw. It protrudes axially from the second cylindrical section and therefore also from the cylindrical saw.
[0032] The invention also relates to a boring kit comprising: - boring tools according to the invention, in which the first diameter of the first cylindrical section of each of the boring tools varies from one boring tool to another, the arrangement and conformation of at least two of the tapped holes being identical between the boring tools; - a support attached to a coupling shaft for coupling with a drill, said support being common to the boring tools by having holes suitable to coincide with at least two identical tapped holes of each of the boring tools, so that each of the boring tools can be fixed by screwing onto the support by at least two screws.
[0033] Thus, thanks to the invention, a single support is sufficient which will be common to all the boring tools, thus making it possible not to have a coupling shaft on the boring tools because it is the common support which carries this coupling shaft.
[0034] It is possible that the supports do not all have the same number of tapped holes, for example some would have two and others would have four, depending on the size of the boring tool.
[0035] However, at least some of their tapped holes are identical (in terms of arrangement and shape) for all boring tools in the same boring kit. The holder, on the other hand, has holes to coincide with all the tapped holes of the boring tool with the greatest number of holes, so that it can be used with all boring tools and fixed by at least two screws, or even more depending on the number of tapped holes.
[0036] According to one possibility, the arrangement and conformation of all the tapped holes of the boring tools are identical between the boring tools, and the holes in the support are able to coincide with all the tapped holes of each of the boring tools.
[0037] According to another possibility, the coupling shaft is a hexagonal, cylindrical or quick-mount shaft.
[0038] The coupling shaft is for example a quick-mount shaft of the SDS type for "Special Direct System".
[0039] Advantageously, the support has a cavity of complementary shape to the stud to center said stud inside said cavity.
[0040] If the block is not of revolution, then the shape of this block is such that it allows the holes to be indexed (or aligned) on the tapped holes.
[0041] According to one possibility, the support is made of a plastic material, a composite material, a resin-based material or a metallic material.
[0042] According to another possibility, the support is a single piece.
[0043] According to one variant, the support and the coupling shaft together form a single piece.
[0044] Thanks to this achievement, it is possible to design the support and the coupling shaft by molding, machining or 3D printing.
[0045] In a particular embodiment, the first diameter and the second diameter of at least two of the boring tools in the boring kit are chosen from the following pairs of diameters, to within ±1 millimeter: - first diameter = 32 millimeters and second diameter = 25 millimeters; - first diameter = 40 millimeters and second diameter = 33 millimeters; - first diameter = 50 millimeters and second diameter = 43 millimeters; - first diameter = 63 millimeters and second diameter = 56 millimeters; - first diameter = 80 millimeters and second diameter = 73 millimeters; - first diameter = 90 millimeters and second diameter = 83 millimeters; - first diameter = 100 millimeters and second diameter = 93 millimeters; - first diameter = 110 millimeters and second diameter = 103 millimeters; - first diameter = 125 millimeters and second diameter = 118 millimeters; - first diameter = 160 millimeters and second diameter = 153 millimeters.
[0046] According to one possibility, each of the boring tools comprises the cylindrical saw having a sawing diameter equivalent to the first diameter, as described above. Brief description of the drawings
[0047] Other features and advantages of the present invention will become apparent from the following detailed description of a non-limiting example of implementation, made with reference to the accompanying figures in which:
[0048] [Fig-1] is a schematic perspective view of a boring tool, with its blade of cut ;
[0049] [Fig.2] is a schematic perspective view of the boring tool of [Fig.1], without its cutting blade;
[0050] [Fig.3] is a schematic perspective view of another boring tool, with its cutting blade, which is larger in size compared to that of [Fig.1];
[0051] [Fig.4] is a schematic perspective view of a suitable support for the boring tool of [Fig.1] and for the boring tool of [Fig.3];
[0052] [Fig.5] is a schematic perspective view of the boring tool of [Fig.1] on which the support of [Fig.4] is fixed;
[0053] [Fig.6] is a schematic perspective view of the boring tool of [Fig.3] on which the support of [Fig.4] is fixed;
[0054] [Fig.7] is a schematic axial cross-sectional view of two assembled pipes, comprising a first plastic pipe having a female end inside which is fitted and glued a male end of a second plastic pipe;
[0055] [Fig.8] is a schematic axial cross-sectional view of the two pipes of [Fig.7], after cutting the second pipe flush with the female end of the first pipe;
[0056] [Fig.9] is a schematic axial cross-sectional view of the two pipes of [Fig.8], where a boring tool is engaged inside the male end of the second plastic pipe, this boring tool having a first diameter equivalent to the internal diameter of the first plastic pipe and a second diameter equivalent to the internal diameter of the second plastic pipe, and where the support of [Fig.4] is fixed on the boring tool and the coupling shaft is coupled to a drill;
[0057] [Fig. 10] is a schematic axial cross-sectional view of the first pipe after the cutting blade of the boring tool has completely planed the male end of the second pipe;
[0058] [Fig. 11] is a schematic view of the first pipe at the end of the boring operation, without the male end of the second pipe which has been planed;
[0059] [Fig.12] is a schematic perspective view of the boring tool of [Fig.1] on which the support of [Fig.4] is fixed and on which a cylindrical saw is also fixed; and
[0060] [Fig.13] is a schematic side view of the boring tool of [Fig.12], with the support coupled to a drill and with the cylindrical saw, and also including a drill bit. [Detailed description with reference to the figures]
[0061] With reference to Figures 1 to 3, a boring tool 1 comprises a body 2 having successively a first cylindrical section 21 and a second cylindrical section 22 centered on a central axis 20. This body 2 is made in the form of a single piece, and it can be produced by machining, molding or 3D printing. This body 2 is, for example, made of a plastic material, a composite material, a resin-based material or a metallic material.
[0062] The first cylindrical section 21 has a first diameter DI for the boring tool 1 of [Fig.1], and D10 for the boring tool 1 of [Fig.3].
[0063] The second cylindrical section 22 has a second diameter D2 for the boring tool 1 of [Fig.1], and D20 for the boring tool 1 of [Fig.3].
[0064] Regardless of the boring tool 1, the second diameter D2 (respectively D20) is smaller than the first diameter DI (respectively D10).
[0065] A notch 23 is made in the body 2 on the first cylindrical section 21 and on the second cylindrical section 22. This notch 23 extends over the entire height of the body 2, and it is delimited by two faces 230, 231 which are perpendicular to each other, and which are both parallel to the central axis 20.
[0066] The first cylindrical section 21 has a flat plate 24 which is opposite the second cylindrical section 22. Tapped holes 25 are provided in this plate 24, with at least two tapped holes 25. In the illustrated example, there are four tapped holes 25.
[0067] These tapped holes 25 are used for screw fixing of a support 4, common to the boring tools 1 of figures 1 and 3. Indeed, these boring tools 1 of figures 1 and 3 belong to a boring kit comprising several boring tools 1 (including at least the two boring tools 1 of figures 1 and 3), in which the first diameter (Dl, D10) of the first cylindrical section 21 of each of the boring tools 1 varies from one boring tool 1 to another, but on the other hand the arrangement and the conformation (diameters) of the tapped holes 25 are identical between the boring tools 1.
[0068] The body 2 has a stud 26 projecting from the plate 24 of the first cylindrical section 21, the tapped holes 25 being provided around said stud 26. This stud 26 is, for example, cylindrical and has a diameter D3 (called the third diameter) smaller than the first diameter D1 or D10. This stud 26 may also have a non-revolutionary shape, for indexing the tapped holes 25 onto the holes 45 (described later) of the support 4.
[0069] This stud 26 is the same for the different boring tools 1. In the illustrated example, the third diameter D3 (or diameter of stud 26) is the same for the boring tools 1 in Figures 1 and 3. Thus, the support 4 can cooperate with stud 26, regardless of the boring tool 1.
[0070] The boring tool 1 includes a cutting blade 3 (which is for example a carbide blade) which is fixed on the first cylindrical section 21 of the body 2, at the notch 23.
[0071] More specifically, the cutting blade 3 is fixed in a recess 28 in one of the sides 231 of the notch 23; this recess 28 being located at the interface between the first cylindrical section 21 and the second cylindrical section 22.
[0072] This cutting blade 3 is fixed by means of a screw 33 which is screwed into a tapped hole 27 opening into the housing 28, and also opening into the periphery of the first cylindrical section 21.
[0073] This cutting blade 3 has a cutting edge 31 which is substantially flush with a periphery of the first cylindrical section 21 for a bore with a bore diameter which is substantially equivalent to the first diameter Dl (or D10), that is to say that the bore diameter is equal to the first diameter Dl (or D10) or is equal to the first diameter DI (or D10) increased by a maximum of one or two millimeters. This cutting edge 31 is parallel to the central axis 20.
[0074] This cutting blade 3 has another cutting edge 32 which is perpendicular to the cutting edge 31 and which extends in a radial direction over a given width which is less than the gap between the first diameter DI (respectively D10) and the second diameter D2 (respectively D20).
[0075] With reference to [Fig.4], the support 4 includes a plate 41 attached to a coupling shaft 40; this coupling shaft 40 being intended for coupling with a drill 7, and it can be a hexagonal shaft (as in the illustrated example), or a cylindrical shaft or a quick-mounting shaft, such as for example of the SDS type for "Special Direct System".
[0076] As explained above, this support 4 is common to the boring tools 1 of the same boring kit, so that each of the boring tools 1 can be fixed by screwing onto the support 4.
[0077] Also, the support 4 has holes 45 provided in the plate 40 which are suitable to coincide with the tapped holes 25 of each of the boring tools 1, so that screws 5 (see figures 5 and 6) allow the support 4 to be fixed on the plate 24 of the body 2. Also, in the illustrated example, the support 4 has four holes 45 for the passage of four screws 5.
[0078] It is conceivable that at least one of the boring tools 1 of the boring kit to which the two boring tools 1 of figures 1 and 3 belong may have only two or three tapped holes 25, instead of four, which can align with the holes 45 of the support 4, for example because this boring tool 1 is smaller and two or three screws 5 are sufficient.
[0079] As can be seen in [Fig.4], the support has a cavity 46 which is complementary in shape to the stud 26, which allows the stud 26 to be centered inside the cavity 46, and therefore the support 4 to be centered on the plate 24.
[0080] The support 4 and the coupling shaft 40 can be made as a single piece, for example by machining, molding or 3D printing. This support 4 / coupling shaft 40 part is, for example, made of a plastic material, a composite material, a resin-based material or a metallic material.
[0081] The remainder of the description relates to the use of the boring tool 1 by an operator, such as a plumber, with reference to figures 7 to 11.
[0082] With reference to [Fig. 7], initially there are two plastic pipes 8, 9, such as two PVC pipes, which are joined end to end by gluing. The first plastic pipe 8 has a female end 80 while the second plastic pipe 9 has a male end 90 inserted and glued inside the female end 80 of the first plastic pipe 8.
[0083] The male end 90 has an external diameter DEXT substantially equivalent to the internal diameter of the female end 80, and furthermore the male end 90 has an internal diameter DINT.
[0084] With reference to [Fig.8], the plumber cuts the male end 90 of the second plastic pipe 9 flush with the female end 80 of the first plastic pipe 8. There then remains a portion of the male end 90 stuck inside the female end 80, and it is this portion of the male end 90 that the boring tool 1 will be able to remove.
[0085] With reference to [Fig.9], the plumber chooses one of the boring tools 1 from his boring kit, selecting the boring tool 1 whose first diameter DI is equivalent to the external diameter DEXT of the male end 90, and whose second diameter D2 is equivalent to the internal diameter DINT of this male end 90.
[0086] The plumber fixes the boring tool 1 onto the common support 4 by means of the screws 5, and he couples the coupling shaft 40 onto a drill 7. Then, the plumber fits the second cylindrical section 22 inside the portion of the male end 90, thus centering the boring tool 1.
[0087] With reference to [Fig. 10], the plumber operates the drill 7 to rotate the boring tool 1, so that the cutting blade 3 planes the portion of the male end 90, while advancing the boring tool 1 inside the first plastic pipe 8, until the boring tool 1 completely planes the portion of the male end 90.
[0088] With reference to [Fig. 11], at the end of the operation and after removing the boring tool 1, the female end 80 of the first plastic pipe 8 has substantially returned to its initial state, i.e. its state before the fitting and gluing of the second plastic pipe 2. Thus, this female end 80 can again receive the male end of another plastic pipe.
[0089] In an improved version, the boring tool 1 also includes a cylindrical saw 6 illustrated in Figures 12 and 13, also called a hole saw, which is formed of a serrated band fixed in a detachable (or removable) manner to the periphery of the first cylindrical section 21 of the body 2, for example by means of several screws (not illustrated).
[0090] Thus, this cylindrical saw 6 has a sawing diameter equivalent to the first diameter DI (or D10). The cylindrical saw 6 extends beyond the first cylindrical section 21 and surrounds the second cylindrical section 22. This second cylindrical section 22 extends axially beyond the cylindrical saw 6 in order to serve as a centering point for the cylindrical saw 6. It should be noted that this cylindrical saw 6 can be slotted to facilitate its mounting on the first cylindrical section 21.
[0091] As can be seen in [Fig. 13], the boring tool 1 may also include a drill 60 extending from the second cylindrical section 22 and coaxial with the central axis 20. This drill 60 may be integral with the coupling shaft 40 and thus pass through body 2. Alternatively, this drill bit 60 is mounted on body 2 so as to be rotationally fixed with this body 2.
[0092] This cylindrical saw 6 is put in place when necessary to make a hole of the first diameter DI (or D10), for example in a plate. Of course, in this case the cutting blade 3 is not used, because it is either covered by the cylindrical saw 6 or it has been previously removed while the cylindrical saw 6 is being used.
Claims
Demands
1. Boring tool (1) for a plastic pipe (8), comprising: - a body (2) having successively a first cylindrical section (21) and a second cylindrical section (22) centered on a central axis (20), in which the first cylindrical section (21) has a first diameter (DI; D10) and the second cylindrical section (22) has a second diameter (D2; D20) which is less than the first diameter (DI; D10), and in which a notch (23) is provided in the body (2) on the first cylindrical section (21) and on the second cylindrical section (22); and - a cutting blade (3) fixed on the first cylindrical section (21) of the body (2), at the level of the notch (23), in which said cutting blade (3) has a cutting edge (31) substantially flush with a periphery of the first cylindrical section for a bore along substantially the first diameter (DI; D10);in which the first cylindrical section (21) has a plate (24), opposite the second cylindrical section (22), and in which tapped holes (25) are provided for fixing by screwing onto a support (4).
2. Boring tool according to claim 1, in which the body (2) has a stud (26) projecting from the plate (24) of the first cylindrical section (21), the tapped holes (25) being provided around said stud (26).
3. Boring tool according to claim 2, wherein the block (26) is cylindrical and has a third diameter (D3) smaller than the first diameter (DI; D10), or has a shape that is not of revolution.
4. Boring tool according to any one of the preceding claims, wherein the body (2) is made of a plastic material, a composite material, a resin-based material or a metallic material.
5. Boring tool according to any one of the preceding claims, wherein the body (2) is a single piece.
6. Boring tool according to any one of the preceding claims, comprising a cylindrical saw (6) formed of a serrated band which is detachably fixed to the periphery of the first cylindrical section (21) of the body (2).
7. Boring tool according to claim 6, wherein the cylindrical saw (6) protrudes from the first cylindrical section (21), and surrounds the second cylindrical section (22), and this second cylindrical section (22) protrudes axially from the cylindrical saw (6).
8. Boring tool according to claim 6 or 7, comprising a drill (60) in the extension of the second cylindrical section (22) and coaxial with the central axis (20).
9. A boring kit comprising: - boring tools (1) according to any one of claims 1 to 7, wherein the first diameter (DI; D10) of the first cylindrical section (21) of each of the boring tools (1) varies from one boring tool (1) to another, the arrangement and conformation of at least two of the tapped holes (25) being identical between the boring tools (1); - a support (4) integral with a coupling shaft (40) for coupling with a drill, said support (4) being common to the boring tools (1) by having holes (45) suitable to coincide with the at least two identical tapped holes (25) of each of the boring tools (1), so that each of the boring tools (1) can be fixed by screwing onto the support (4) by at least two screws (5).
10. Boring kit according to claim 9, wherein the boring tools (1) conform to claim 2, and the support (4) has a cavity (46) of complementary shape to the stud (26) for centering said stud (26) inside said cavity (46).
11. Boring kit according to claim 9 or 10, wherein the coupling shaft (40) is a hexagonal, cylindrical or quick-mount shaft.
12. Boring kit according to any one of claims 9 to 11, wherein the support (4) is made of a plastic material, a composite material, a resin-based material or a metallic material.
13. Boring kit according to any one of claims 9 to 12, wherein the first diameter (DI; D10) and the second diameter (D2; D20) of at least two of the boring tools (1) of the boring kit are selected from the following pairs of diameters, to within ±1 millimeter: - first diameter = 32 millimeters and second diameter = 25 millimeters; - first diameter = 40 millimeters and second diameter = 33 millimeters; - first diameter = 50 millimeters and second diameter = 43 millimeters; - first diameter = 63 millimeters and second diameter = 56 millimeters; - first diameter = 80 millimeters and second diameter = 73 millimeters; - first diameter = 90 millimeters and second diameter = 83 millimeters; - first diameter = 100 millimeters and second diameter = 93 millimeters; - first diameter = 110 millimeters and second diameter = 103 millimeters; - first diameter = 125 millimeters and second diameter = 118 millimeters; - first diameter = 160 millimeters and second diameter = 153 millimeters.
14. Boring kit according to any one of claims 9 to 13, wherein each of the boring tools (1) conforms to claim 6 and includes the cylindrical saw (6) having a sawing diameter equivalent to the first diameter (DI; D10).
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