GB2612939A

GB2612939A - Mitre box with removable saw guide slot sections

Info

Publication number: GB2612939A
Application number: GB2009195.5A
Authority: GB
Inventors: Mark White Richard; Jayne Senior Alison
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-11-17
Filing date: 2021-11-17
Publication date: 2023-05-24
Also published as: GB202009195D0

Abstract

A mitre box 1 with removable and replaceable saw guide slots 2-5, 15, and 16 which are inserted vertically by slotting and holding means on the base 11 and two wall sections 6, 10, along with an inner surface section 28 (figure 5) supporting angled or straight cutting using a saw. The slots are preferably rectangular cuboids and may have a cut 9A, 17A, 18A, 19-21 going three quarters down the height of the slot, and may comprise protruding tabs 7, 8, on its sides that align with grooves 12 in the walls, and a metal peg 14 on the bottom that aligns with holes 13 on the base. The base may comprise pegs 58, 59 (figure 3) for supporting the subject work or wood, these pegs preferably being arranged in rows. The inner surface section or cover may be narrower than the base and may be placed on the base by four equally opposed fitting pegs 24-27 (figure 2).

Description

PATENT APPLICATION OF

RICHARD MARK WHITE AND ALISON JAYNE SENIOR

FOR

MITRE BOX WITH REMOVABLE SAW GUIDE SLOT SECTIONS

Field of the Invention

The present invention relates to miter boxes or also known as miter blocks which are used with a saw to create exacting cuts which are straight and angled when working with wood or other materials.

Background

The use of mitre boxes is well known and they are used by workers when a subject material such as a piece of wood is required to have a straight or angled cut to ensure it is the correct shape for an application, for example; wooden beading between a floor and a skirting board. They are also used to cut mitred joints in skirting, architrave and decorative timber. The timber is held in place inside the box and then cut with the mitre slots acting as a guide for the saw. Caving boxes deliver a similar result but are intended for cutting plaster and polystyrene covino. Mitre boxes come in a variant of types mainly having a base with two opposing walls with saw guide slots cut into the walls providing 45 and 90 degree cutting angles for wood or other materials. The cutting guide slots often become wider over time as the saw blade cuts into the slot and the body material of the box wall. This creates inaccurate guides for the saw and results in incorrect angles when cut which affect the work seriously. As the mitre box is quite a standard type of tool in its generality, patents have been filed to offer improvements to the tool, these are shown in the following examples: This is shown in patent US20090056518 (STEIN) discloses an invention which supports masonry pieces during cutting in order to obtain 45 and 22.5 degree angles. The present invention further encompasses a method and material for manufacture that being injection-moulded plastic, so the invention is waterproof and harmless to modern diamond saw blades. The method for using the invention is in combination with a table style wet saw, in particular, one using a roller tray with lip or one that guides motor and the blade across a stationary tray with lip. The size and dimensions of the invention are worked out for the greatest number of uses in the widest variety of applications. The present invention method incorporates a slot to be used as a saw blade guide. One skilled in the art will find this device is capable of quickly and safely supporting masonry pieces for inside and outside 45 and 22.5 degree cuts, namely miters.

Primarily this device is intended to be used with standard masonry wet saws. It is conceivable that this device would be helpful at a multitude of other tasks, where support and miter angles are a part of the work process.

Patent US4218947 (LAVIOLA) discloses a mitre box particularly adapted for precise mitring of inside and outside corner molding includes a square base having a first saw guide mounted on the upper surface thereof along a diagonal of the base. A second saw guide is also mounted on the base and is comprised of a pair of blocks located adjacent two edges of the square; the pair of blocks terminating adjacent a corner on the diagonal in line with the first guide. A rectangularly shaped support block is mounted on the base on either side of each of the guide blocks for supporting the molding to be mitred in proper orientation. The lower portions of the ends of the guide blocks adjacent the corner are-cut away to allow the end of the molding being mitred to pass therethrough.

Patent CH648787 (SEGERINK) discloses a mitre box wherein workpieces are secured in the mitre box (1) by stops (14, 15) adjustable transversely to the workpiece to be secured. The stops (14, 15) can be adjusted back and forth by threaded rods (8, 9) mounted in grooves in the base of the mitre box.

Patent DE3308268 (WOLFF) discloses a mitre box, which comprises an elongated basic body (1) with a stop device (4) for bearing against a workpiece (11) and comprising a saw blade guide (2) which is rotationally adjustable about a longitudinal end of the base body, is to be suitable for use not only for mitre cutting but also for other cutting work, such as for example longitudinal slitting of a board or a panel and be suitable for right-handed and left-handed people. For this purpose, the invention provides that the stop device can be shifted through 90 DEG on the basic body in a plane perpendicular to the cutting plane, that the basic body is a profiled rail and that the stop device comprises a sliding piece (7) which is provided with two crossing, continuous receiving channels (5,6) for the basic body rail (1) and is provided on its underside with a stop flange (8).

Patent EP0075276 (LE:CHI) discloses a mitre box for sawing elongated workpieces at certain angles, consisting of a base plate and two walls perpendicular thereto, between which the workpiece is laid. In the case of conventional boxes, the saw is guided by slots in the box wails, said slots being widened in the course of use due to the inclination of the saw, resulting in an inaccurate saw-cut. According to the invention, the saw is guided by two, preferably round, pins which have a recess corresponding to the cross-section of the saw and run in vertical bores in the walls of the box. By this measure, the saw is guided exactly and permanently. To achieve an accurate cut, however, exact positioning of the workpiece is also necessary, for which a block, as intermediate or wedge-shaped support for long or cylindrical workpieces, is used. If a guide rod is pivotably inserted in a frame, all intended angular cuts can be so arranged that they converge from the front box wall to a point in the rear wail.

The prior art therefore shows that there is a need for a more effective mitre box which enables the cutting guide slots to be replaced when they have worn through to form an undesired wider slot and provide adjustable support for the subject being cut.

Summary of the invention

According to the present invention there is provided a mitre box which has removable and replaceable saw guide slot sections, to make it possible for the saw guide slots to be replaced with new ones, after they become worn.

As a saw is drawn forward and backward through the saw guide slot located on the vertically opposed walls of a mitre board, the guide slots become widened over time as the saw is drawn through and an incorrect angle of the guide slot is created and remains. Therefore when a user places their saw into the saw guide slots on the mitre box, the cut of the subject, be it wood; plastics; beadings or metals in engineering examples; is incorrectly aligned and an inaccurate cut and angle is the result.

The present invention provides a mitre box which has removable saw guide slot sections which are removed and replaced by new saw guide slot sections to ensure accurate and exacting cuts can continue to be made using the same mitre box, over an ongoing period, with repeated replacements of these saw guide slots, with no need to purchase a whole new mire box which is expensive. The mitre box is presented as a rectangular form made of a hard wearing injection moulded plastic or similar material, having a solid base which all other parts are attached to. To the solid base are located the wall sections which are affixed vertically from the base edge. The two walls form six sections which are shaped and each shape forms an opening into which the said saw guide slot sections are inserted. To enable the insertion of the saw guide slots a vertical straight fitting groove is provided on all inward facing edges of said wall sections. To the bottom of each wall section opening is a hole located into the base on the upper facing edge. The hole is located centrally to the opening between the wall sections. Each of the said wall section openings are exactly identical in size and shape with the said vertical straight fitting grooves located to each inner face edge of the walls openings.

The saw guide slots are provided as rectangular sections of a solid form, made of a hard wearing solid material such as a solid nylon; hard wearing plastic or a carbon based composite. Each section has a cut through slot a third of the way down the height of the section.

To each saw guide slot section is a straight vertical slotting tab which is located to each narrow side of the section from the top to the bottom, to engage and be slid downward into the aforementioned vertical straight fitting grooves of the vertical wall sections. Both the straight fitting groove and the slotting tab which is slid into it are precisely sized to ensure a secure fitting of the saw guide slot sections. During the action of sawing the saw guide slots have no movement within said straight fitting grooves.

The saw guide slot sections each have a metal peg fitting which is only partially visible as a protrusion from the bottom facing side, with at least half of said metal peg inserted within the body of the slit section bottom. This metal peg locates into the aforementioned hole situated to the wall section opening on the base edge, when the saw guide slot section is slid down.

The metal peg provides added strengthening and support to the saw guide slot section in combination with its engagement with the slotting tabs on each of its sides within the straight fitting grooves thereto.

Each saw guide slot section is pulled by hand upward to be removed from the wall section opening, into which replacement guide slot sections are slid fully down. The said slotting tabs engaged and slid within the vertical straight fitting grooves enable this hand removal and the new replacement of the saw guide slot sections to be slid back down using the same hand method.

The saw guide slot section is fully seated into the wall section opening when its top is level with that of the top of the wall sections between which it has been slid downward. The metal peg is also therefore fully seated into its centrally located hole, as shown in the accompanying Figures.

In the first example, four of the saw guide slot sections have saw guide slots in them at forty five degrees, forming an 'X' cut guide between the group of four in the known way, when looking down on top of the mitre box in a plan view. As shown in Figure 2; 9A, 17A, 19 and 20.

The remaining two saw guide sections form a ninety degree straight cut guide 18A and 21 between them in the known way, as also shown in Figure 2.

The said base of the mitre box has at least four equally opposed fitting pegs onto which holes in the underside of an inner surface section 28 are engaged. The inner surface section is narrowed when compared to the base width and seats inside the inner facings of the wall sections. Its underside holes slot over the short vertical fitting pegs to seat its underside directly on top of the bases upper surface, as shown in Figure 3 as 280 and Figure 5 as 28D.

Once seated the inner surface section adds base height to provide a suitable level for working on and cutting depths which are aligned with the saw guide slot sections. The holding of the subject work, for example; a piece of wood, is aided by metal pegs 29 and 30 inserted into a chosen hole located in rows to each end of the inner surface section, 22 and 23 in Figure 2.

The subject is then placed on the top of said metal pegs protruding vertically from the inner surface section, to be sawed using a selected pair of saw guide slot sections.

The metal pegs 29 and 30 can be inserted in any arrangement, with further pegs added within the holes of the two rows 22 and 23, to adapt to the required support and size of the subject being cut.

For example, if four metal pegs are inserted into the rows of holes on each end of the inner surface section the subject, 'wood' can be laid on the tips of the metal pegs to support it while it is being cut using the saw guide slots and a hand saw.

When all six saw guide sections are inserted into said wall section openings two completed vertical walls are created and are perpendicularly presented from the base.

Although not a common practice, the saw guide slot sections may also be interchanged should a work project require the none-standard arrangement of cutting guide angles. For example it may be required to have a row of ninety degree or straight cutting guides to provide a multiple cutting action on a piece of subject material. This is done be simply sliding out the desired saw guide slot sections and replacing them with those required. The mitre box may also have more than six replaceable saw guide slot sections.

In this respect, before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and to the arrangements of the components set forth in the following description or illustrated in the drawings The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting.

As such, those skilled in the art will appreciate that the conception, upon which this disclosure is based, may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention. It is important, therefore, that the claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present invention Further, the purpose of the foregoing abstract is to enable the Patent Office and the public generally, and especially the scientists,engineers and practitioners in the art who are not familiar with patent or legal terms or phraseology, to determine quickly from a cursory inspection the nature and essence of the technical disclosure of the application. The abstract is neither intended to define the invention of the application, which is measured by the claims, nor is it intended to be limiting as to the scope of the invention in any way.

It is therefore an object of the present invention to provide a new and improved mitre box which has removable and replaceable saw guide slot sections, which has all the advantages of the prior art mitre boxes and none of the disadvantages.

It is another object of the present invention to provide a new mitre box which has removable and replaceable saw guide slot sections, which may be easily and efficiently manufactured and marketed.

It is a further object of the present invention to provide a new and improved mitre box which has removable and replaceable saw guide slot sections, which is of durable and reliable construction.

An even further object of the present invention is to provide a new and improved mitre box which has removable and replaceable saw guide slot sections, which is susceptible of a low cost of manufacture with regard to both materials and labour, and which accordingly is then susceptible of low prices of sale to the consuming public, thereby making such a product available to the buying public.

Still yet another object of the present invention is to provide a new and improved mitre box which has removable and replaceable saw guide slot sections, which provides in the apparatuses and methods of the prior art some of the advantages thereof, while simultaneously overcoming some of the disadvantages normally associated therewith.

These together with other objects of the invention, along with the various features of novelty which characterize the invention, are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and the specific objects attained by its uses, reference should be had to the accompanying drawings and detailed descriptive matter in which there is illustrated preferred embodiments of the invention.

Brief description of figures

Figure 1 shows a dimensional view of the mitre box with removable and replaceable saw guide slot sections.

Figure 2 shows a plan view of the mitre box with saw guide slot sections in place.

Figure 3 shows an end elevation of the mitre box with saw guide slot sections removed.

Figure 4 shows a plan view of the mitre box with saw guide slot sections removed.

Figure 5 shows a plan view of the mitre box with the inner surface section being placed onto the base.

Figure 6 shows a dmerisional view of a single saw guide slot section for a ninety degree cut.

Figure 7 shows a dimensional view of a single saw guide slot section for a ninety degree cut inserted into the mitre box wall.

Figure 8 shows a dimensional view of a single saw guide slot section for a ninety degree cut being removed from the mitre box wall.

Figure 9 shows a frontal elevation of a single saw guide slot section for a ninety degree cut.

Figure 10 shows a frontal elevation of a single saw guide slot section for a ninety degree cut inserted into the mitre box wall.

Figure 11 shows a frontal elevation of a single saw guide slot section for a forty five degree cut inserted into the mitre box wall.

Figure 12 shows a dimensional view of a single saw guide slot section for a forty five degree cut.

Figure 13 shows a side elevation of a single saw guide slot section.

Figure 14 shows a side elevation of the mitre box will the saw guide slot sections in place.

Detailed description of figures

A typical embodiment of the mitre box which has removable and replaceable saw guide slot sections is shown in Figure 1. It comprises the mitre box 1, which has opposed vertical wall sections 6 and 10 located onto a horizontal solid base 11. To the wall sections are located removable and replaceable saw guide slot sections 2, 3, 4, 5, 15 and 16. Each saw guide slot section 2, 3, 4, 5, 15 and 16 has saw guide slots 9A, 17A, 18A, 19, 20 and 21 (as shown in Figure 1 and 2).

Each saw guide slot section has straight vertical slotting tabs, shown as 7 and 8 on example 2, in Figure 1. The straight vertical slotting tabs slide vertically downward into vertical straight fitting grooves shown as 12 which are provided on all inward facing edges to engage and be slid downward into the aforementioned vertical straight fitting grooves of the vertical wall sections. Both the straight fitting groove and the slotting tab which is slid into it are precisely sized to ensure a secure fitting of the saw guide slit sections. During the action of sawing the saw guide slits have no movement within said straight fitting grooved.

A hole 13 located in the base 11 edge receives a metal pin 13 when the saw guide slot sections are fully slid down.

Figure 2 shows a plan view of Figure 1 wherein the mitre box 1A has the opposed vertical wall sections 6A and 10A with inner surface section 28 located between them. Saw guide slot sections 2A, 3A, 4A, 5A, 15A and 16A are shown in a plan view with saw guide slots 9A, 17A, 18A, 19, 20 and 21 in their fitted position within vertical wall sections 6A and 10A thereto.

The said inner surface section 28 is narrowed when compared to the base width and seats inside the inner facings of the wall sections 6A and 10A. Its underside holes 24, 25, 26 and 27 slot over the short vertical fitting pegs (Not shown in this view) to seat its underside directly on top of the upper surface of the base located underneath.

The holding of the subject work, for example; a piece of wood, is aided by metal pegs (not shown in this view) inserted vertically into a chosen hole located in hole rows 22 and 23 to each end of the inner surface section 28.

An end elevation view of the mitre box 1B is shown in Figure 3 with base 11B and opposed vertical wall sections 6B and 10B. Inner surface section 28B is inserted downward between wall sections 6B and 10B with the short vertical fitting pegs 58 and 59 presented vertically from the base 11B seating into underside holes 24B and 26B of the inner surface section 28B, as shown.

Aforementioned metal pegs 29 and 30 slot into holes selected from hole row 22 For the holding of subject work, wherein the piece of wood, plaster, plastic, or metal which is being cut rests on the tips of the metal pegs, equally supported at the opposing end of the mitre box on a second selected metal peg or two or more pegs as required.

Figure 4 shows a plan view of the mare box with saw guide slot sections removed revealing the six wall section openings 60, 61, 62, 63, 64 and 65 which is the space remaining derived from the wall sections 6C and 10C and the upper facing edge of the base 11C, between which the inner surface section 28C is inserted.

Each inner facing edge of the wall section openinds has the aforementioned vertical straight fitting grooves 31, 33, 34, 36, 37, 39, 40, 42, 43, 45, 46 and 48 into which each saw guide slot section is slid downward by slotting the straight vertical slotting tabs (not shown in this view) on each side of them into said grooves thereto.

Aforementioned holes 32, 35, 38, 41, 44 and 47 located in the base 11C edge receives a metal pin when the saw guide slot sections are fully slid down, as said metal pin is located centrally and in exacting position for each hole to the underside of each saw guide section.

Figure 5 shows a plan view of the mitre box with he inner surface 28D section being placed onto the base 11D.

Figure 6 shows the rectangular cuboid form of a saw slot guide section 16E having a saw guide slot 18E located a three quarters of the distance down the cuboid body. The saw guide slot top opening 50 is located through the saw guide slot section upper surface 49 and 51 as shown. Straight vertical slotting tabs 52 and 53 are located to each side of the cuboid body 54 with a metal pin 55 located to the underside end.

The saw slot guide section 16F is shown fully in place within wall 1OF and locating into base 11F via means of aforementioned metal pin 55F in hole 47F saw guide slot 18F is shown located three quarters of the distance down the cuboid body, with the straight vertical slotting tabs 52F and 53F located to each side of the cuboid body 54F and slotted down into vertical straight fitting grooves 46F and 48F. As shown in Figure 7.

Figure 8 shows the saw slot guide section 16G being removed upward from the wall 10G and away from the base 11G with metal pin 55G exiting hole 47G; via aforementioned means of the straight vertical slotting tabs 52G and 53G located to each side of the cuboid body being slid up via the vertical straight fitting grooves 46G and 48G.

A frontal elevation of the saw slot guide section 16H is shown in Figure 9 with saw guide slot 18H located a third of the way down the cuboid body. The saw guide slot top opening 50H is located through the saw guide slot section upper surface 49H and 51H as shown. Straight vertical slotting tabs 52H and 53H are located to each side of the cuboid body 54H with a metal pin 55H located to the underside end 56.

In Figure 10 we see the frontal elevation of the saw slot guide section 161 fully inserted into the wall 101 and the base 111 with straight vertical slotting tabs 521 and 531 located to each side of the section into vertical straight fitting grooves 461 and 481, with a metal pin 551 located into the hole 471.

In Figure 11 a saw guide slot section 15J is shown in place in the mitre box wall 10J with its forty five degree saw guide slot 17J.

The saw guide slot section 15K with the forty five degree saw guide slot 17K is shown dimensionally in Figure 12 with straight vertical slotting tabs 56 and 57 and metal pin 58. This saw guide slot section 15L is shown further in Figure 13 from a side view with vertical slotting tab 56L and the depth of the saw guide slot 17L shown above the metal peg 58L.

A side elevation of the mitre box is shown in Figure 14 where the wall 10M and base11M have the saw guide slot sections 2M, 15M and 16M with the saw guide slots 9M, 17M and 18M shown on them and each slot section having metal pegs 14M, 55M and 58M inserted within the base 11M, as shown.

Claims

Claims 1) A mitre box which has removable and replaceable saw guide slot sections comprising; removable and replaceable saw guide slot sections which are inserted vertically into openings using slotting and holding means in two wall sections and a base, which are perpendicularly affixed to said solid base having an inner surface section on top; on which subject materials can be supported for angled or straight cutting using a saw.
2) A mitre box which has removable and replaceable saw guide slot sections according to claim 1 wherein a saw guide slot section into which a saw is inserted for sawing of a subject material, can be removed when worn.
3) A mitre box which has removable and replaceable saw guide slot sections according to claim 1 wherein said saw guide slot sections are individual pieces in rectangular cuboid form with a saw guide slot cut into their body three quarters of the distance down the height of the section.
4) A mitre box which has removable and replaceable saw guide slot sections according to claim 1 wherein said slotting and holding means comprise each saw guide slot section having a straight vertical slotting tab to each vertical side of the cuboid.
5) A mitre box which has removable and replaceable saw guide slot sections according to claim 1 wherein slotting and holding means further comprise each saw guide slot section having a metal pin located to its underside end.
6) A mitre box which has removable and replaceable saw guide slot sections according to claim 5 wherein slotting and holding means further comprising said metal pin locating and inserting into a hole located on the upper facing edge of said base.
7) A mitre box which has removable and replaceable saw guide slot sections according to claim 1 wherein said slotting and holding means even further comprising vertical straight fitting grooves provided on all inward facing edges of wall section openings.
8) A mitre box which has removable and replaceable saw guide slot sections according to claim 7 wherein vertical straight fitting grooves provide downward and upward slotting; for said straight vertical slotting tabs on each saw guide slot section.
9) A mitre box which has removable and replaceable saw guide slot sections according to claim 1 wherein subject work is supported and held by metal pegs.
10) A mitre box which has removable and replaceable saw guide slot sections according to claim 9 wherein said metal pegs are inserted in a selected hole in a hole row located in each end of the surface of said inner surface section.
11) A mitre box which has removable and replaceable saw guide slot sections according to claim 1 wherein said base has four equally opposed fitting pegs which go into four corresponding holes located in the underside of said inner surface section.
12) A mitre box which has removable and replaceable saw guide slot sections according to claim 11 wherein said inner surface section is narrowed when compared to the base width onto which it is removably affixed and seats inside the inner facings of the said wall sections 13) A mitre box which has removable and replaceable saw guide slot sections according to any preceding claim; including a base with an inner surface section located on top of it for subject work support and holding, two vertical wall sections which have openings into which removable and replaceable saw guide slot sections can be slid downward or upward for full removal using tab and groove means with a base inserted metal peg.