WO2010035297A1 - Blade, connectable at both ends, for small alternating electric saws - Google Patents

Blade, connectable at both ends, for small alternating electric saws Download PDF

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Publication number
WO2010035297A1
WO2010035297A1 PCT/IT2008/000758 IT2008000758W WO2010035297A1 WO 2010035297 A1 WO2010035297 A1 WO 2010035297A1 IT 2008000758 W IT2008000758 W IT 2008000758W WO 2010035297 A1 WO2010035297 A1 WO 2010035297A1
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WO
WIPO (PCT)
Prior art keywords
blade
saw
shank
length
thickness
Prior art date
Application number
PCT/IT2008/000758
Other languages
French (fr)
Inventor
Daniele Piazza
Original Assignee
Daniele Piazza
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daniele Piazza filed Critical Daniele Piazza
Publication of WO2010035297A1 publication Critical patent/WO2010035297A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
    • B23D61/12—Straight saw blades; Strap saw blades
    • B23D61/128—Sabre saw blades

Definitions

  • Blade connectable at both ends, for small alternating electric saws
  • the present invention concerns blades for alternating cutting devices and in particular a blade for small alternating electric saws, the blade having a connection at each end.
  • Blades for small alternating electric saws are tools fitted onto a hand-held frame, the blade being moved back and forth by an electric motor through a mechanism inside the frame.
  • Figures 1 and 2 show two types of longitudinal blades, Ia and Ib, for alternating electric sawing devices present on Hie market such as, for example, that shown in Figure 3.
  • the blade appears as a flexible metal bar, of a length greater than its thickness, consisting of a body 2 of L D length a shank 3 a at one end of the blade Ia and a tip 5 at the end opposite that of the shank 3a.
  • the body 2 is that part of the blade at the edge of which the teeth 4 are cut for the entire L D length .
  • the teeth therefore form the cutting edge which is the operative part of the blade Ia.
  • the shank 3 a forms the end of the blade which at that point is fixed to the push rod of the saw.
  • Shank 3 is provided with a connecting means 7a through which there are holes 8 of different diameters aligned in the direction of the blade Ia.
  • Figure 2 shows a blade Ib that differs from blade Ia in Figure 1 in that its shank 3b is of another type having a connecting means 7b whose profile on both sides comprises a projection 9 next to which is a recess 10.
  • Figure 3 shows one of the small alternating electric saws 15 available on the market, such as the Bosch "Professional GST 75 BE" model into which the blade Ib has been fitted.
  • the saw 15 comprises a body 16, containing the electric motor and mechanical parts, so shaped as to form a handgrip 17, a part 18 into which the blade Ib is fitted, and a foot in the shape of a perforated plate 19 through which the blade Ib passes during its alternating movement and which rests on the object to be sawn.
  • Figures 4 and 5 show the alternating electric saw 15 in Figure 3 when being used to saw through a wooden panel 25 of S thickness, lesser than the length L D Figure 4 in particular shows the blade Ib when fully extended, while Figure 5 shows blade Ib when at its minimum extension.
  • the body 2 of the blade Ib is divisible into two parts, 26 and 27, respectively above and below the foot 19 when the blade Ib is at its maximum extension.
  • Figure 5 shows that part 26 returns inside the body 16 of the saw 15, said part being raised by the push rod and therefore never coming in contact with the panel 25 to be sawn.
  • Figure 6 shows that the teeth on the upper part 26 of the body 2 of blade Ib do not get worn because said part 26 is never involved in the sawing operations.
  • the lower part 27 of the body 2 is involved in sawing for a length 28 equal to the sum of thickness S of the panel 25 and of travel E made by the blade Ib.
  • Figures 7a, 8a and 9a show the blade Ib fitted into the alternating saw 15 in the position of its maximum extension when the blade is used to saw panels of decreasing thickness such as Sl, S2 and S3.
  • Figure 7a illustrates a case in which the length of the lower part 27 of the body 2 of blade Ib is equal to that of thickness Sl of the object to be sawn. This thickness is the maximum that saw 15 can cut with blade Ib.
  • Figure 7b shows, in this example of its use, wear on the teeth of blade Ib is uniform along the entire length of its lower part 27.
  • Figure 8a illustrates a case in which the lower part 27 of the body 2 is slightly longer than the thickness S2 of the object to be sawn. As seen in Figure 8b, this example of its use shows that the lower part 27 is unevenly worn, but that the worn length 29 is in any case longer than the unworn length 30.
  • Figure 9a illustrates a case in which the lower part 27 of the body 2 is considerably longer than the thickness S3 of the object to be sawn. Again, in the example of utilization seen in Figure 9b, the lower part 27 is unevenly worn but, contrary to what is seen in Figure 8b, the worn length 31 is shorter than the unworn length 32.
  • the blade when the blade is mainly used to saw objects of a thickness considerably less than its length, the blade ends its useful life (i.e. when it can no longer saw) with its toothed cutting edge worn only along a short section of its length.
  • Purpose of the present invention is to overcome the above drawback and to offer an optimum blade for small electric alternating saws used for cutting objects of a thickness considerably less than the length of the blade.
  • Subject of the present invention is a blade for alternating saws, said blade comprising:
  • first means for holding the blade to means for moving it inside the saw said first holding means being placed at a first end of said bar; second means for holding the blade to said means for moving it inside the saw, said second holding means being placed at the other end of said bar, as described in claim 1.
  • said first and second holding means each comprise a shank through which there is at least one hole.
  • said first and second holding means each comprise a shank in the profile of which, on both sides, there is at least one projection contiguous to a recess.
  • said first and second holding means each comprise a shank in which there is at least one engaging tooth fixed to one face of the shank.
  • Another subject of the invention is a method for sawing a panel of wood or of some material of comparable hardness, by means of a small electric alternating saw, as described in claim 5, said method involving: - a blade having at least one toothed edge and two shanks for fixing it to the saw, one shank being situated at each end of the blade;
  • Figure 1 a front view of a blade made according to present technique.
  • Figure 2 a front view of an alternative form of the blade in Figure 1.
  • Figure 3 perspective view of a small electric alternating saw onto which the blade in Figures 1 or 2 has been fitted.
  • Figure 4 a front view of the saw in Figure 3 used for cutting a panel, seen when the blade is at its maximum extension.
  • Figure 5 differs from Figure 4 in that the blade is at its minimum extension.
  • Figure 6 front view of the blade in Figure 2 showing a length with worn teeth.
  • Figures 7a, 8a, 9a respective front views of the saw in Figure 3 in examples of its use for cutting panels of different thicknesses.
  • Figures 7b, 8b, 9b respective front views of the blade in Figure 3, fitted onto the saws in Figures 7a, 8a and 9a, each at the end of its working life.
  • Figure 10 a front view of a blade made according to the present invention.
  • Figure 11 a front view of an alternative form of the blade in Figure 10.
  • Figure 12 a front view of an electric alternating saw with the blade in Figure
  • Figures 10 and 11 show two types of blade, 40a and 40b, for alternating electric saws such as the model illustrated in Figure 3.
  • Figure 10 the
  • blade 40a is shown as consisting of a metal bar of a length greater than the thickness, comprising a body 41, a first shank 42a formed at one end of the blade, and a second shank 43 a at the end opposite to that with the first shank
  • FIG. 11 shows a blade 40b that differs from blade 40a in Figure 10 as the shanks 42b and 43b at the ends are of a different type, each having its own connection 45b whose profile, on both sides, comprises a projection 47 contiguous to a recess 48.
  • Each blade, 40a and 40b can be fitted onto blade-pushing means inside the frame of the alternating electric saw at one or other of its shanks.
  • Figure 12 shows one of the alternating electric saws 15 available on the market, such as the Bosch "Professional” model GST 75 BE, with the blade 40b, used for cutting a wooden panel 25 of S thickness, fitted onto it and seen in the case illustrated by Figures 9a and 9b.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sawing (AREA)
  • Lubricants (AREA)
  • Knives (AREA)

Abstract

A blade (40a; 40b) for alternating electric saws (15) having two shanks (42a,-43a;42b, 43b), respectively one at each end of the blade. The shanks comprise connecting means for fitting the blade onto the saw. If the blade is used to cut objects of a thickness considerably less than the length of its central body (41), the blade becomes worn along an extremely short section of its length. When the teeth (44) of the blade are so worn that they can no longer cut, the blade can be detached from its seat in the saw, reversed and reattached using the shank at its other end to do so. In this way cutting operations can be resumed with the same blade but using those teeth not hitherto involved in cutting.

Description

Blade, connectable at both ends, for small alternating electric saws
Field of application
The present invention concerns blades for alternating cutting devices and in particular a blade for small alternating electric saws, the blade having a connection at each end. Review of the known art
Blades for small alternating electric saws are tools fitted onto a hand-held frame, the blade being moved back and forth by an electric motor through a mechanism inside the frame. Figures 1 and 2 show two types of longitudinal blades, Ia and Ib, for alternating electric sawing devices present on Hie market such as, for example, that shown in Figure 3. In Figure 1 the blade appears as a flexible metal bar, of a length greater than its thickness, consisting of a body 2 of LD length a shank 3 a at one end of the blade Ia and a tip 5 at the end opposite that of the shank 3a. The body 2 is that part of the blade at the edge of which the teeth 4 are cut for the entire LD length. The teeth therefore form the cutting edge which is the operative part of the blade Ia. The shank 3 a forms the end of the blade which at that point is fixed to the push rod of the saw. Shank 3 is provided with a connecting means 7a through which there are holes 8 of different diameters aligned in the direction of the blade Ia. Figure 2 shows a blade Ib that differs from blade Ia in Figure 1 in that its shank 3b is of another type having a connecting means 7b whose profile on both sides comprises a projection 9 next to which is a recess 10. Figure 3 shows one of the small alternating electric saws 15 available on the market, such as the Bosch "Professional GST 75 BE" model into which the blade Ib has been fitted. The saw 15 comprises a body 16, containing the electric motor and mechanical parts, so shaped as to form a handgrip 17, a part 18 into which the blade Ib is fitted, and a foot in the shape of a perforated plate 19 through which the blade Ib passes during its alternating movement and which rests on the object to be sawn. Figures 4 and 5 show the alternating electric saw 15 in Figure 3 when being used to saw through a wooden panel 25 of S thickness, lesser than the length LD Figure 4 in particular shows the blade Ib when fully extended, while Figure 5 shows blade Ib when at its minimum extension. With reference to Figure 4, it will be seen that the body 2 of the blade Ib is divisible into two parts, 26 and 27, respectively above and below the foot 19 when the blade Ib is at its maximum extension. Figure 5 shows that part 26 returns inside the body 16 of the saw 15, said part being raised by the push rod and therefore never coming in contact with the panel 25 to be sawn. Figure 6 shows that the teeth on the upper part 26 of the body 2 of blade Ib do not get worn because said part 26 is never involved in the sawing operations. The lower part 27 of the body 2 is involved in sawing for a length 28 equal to the sum of thickness S of the panel 25 and of travel E made by the blade Ib. Figures 7a, 8a and 9a show the blade Ib fitted into the alternating saw 15 in the position of its maximum extension when the blade is used to saw panels of decreasing thickness such as Sl, S2 and S3.
Figure 7a illustrates a case in which the length of the lower part 27 of the body 2 of blade Ib is equal to that of thickness Sl of the object to be sawn. This thickness is the maximum that saw 15 can cut with blade Ib. As Figure 7b shows, in this example of its use, wear on the teeth of blade Ib is uniform along the entire length of its lower part 27. Figure 8a illustrates a case in which the lower part 27 of the body 2 is slightly longer than the thickness S2 of the object to be sawn. As seen in Figure 8b, this example of its use shows that the lower part 27 is unevenly worn, but that the worn length 29 is in any case longer than the unworn length 30.
Figure 9a illustrates a case in which the lower part 27 of the body 2 is considerably longer than the thickness S3 of the object to be sawn. Again, in the example of utilization seen in Figure 9b, the lower part 27 is unevenly worn but, contrary to what is seen in Figure 8b, the worn length 31 is shorter than the unworn length 32.
It follows that when the blade is mainly used to saw objects of a thickness considerably less than its length, the blade ends its useful life (i.e. when it can no longer saw) with its toothed cutting edge worn only along a short section of its length.
Summary of the invention
Purpose of the present invention is to overcome the above drawback and to offer an optimum blade for small electric alternating saws used for cutting objects of a thickness considerably less than the length of the blade. Subject of the present invention, therefore, is a blade for alternating saws, said blade comprising:
- a metal bar of a length greater than the thickness, having at least one . longitudinal toothed edge;
- first means for holding the blade to means for moving it inside the saw, said first holding means being placed at a first end of said bar; second means for holding the blade to said means for moving it inside the saw, said second holding means being placed at the other end of said bar, as described in claim 1.
Further characteristics of the present invention considered as being innovative are described in the dependent claims.
According to one aspect of the invention, said first and second holding means each comprise a shank through which there is at least one hole. According to another aspect of the invention, said first and second holding means each comprise a shank in the profile of which, on both sides, there is at least one projection contiguous to a recess.
According to a further aspect of the invention, said first and second holding means each comprise a shank in which there is at least one engaging tooth fixed to one face of the shank.
Another subject of the invention is a method for sawing a panel of wood or of some material of comparable hardness, by means of a small electric alternating saw, as described in claim 5, said method involving: - a blade having at least one toothed edge and two shanks for fixing it to the saw, one shank being situated at each end of the blade;
- one of said panels of a thickness less than the difference between half the length of the toothed edge and the travel made by the blade inside the saw; - cutting the panel with the above blade until its teeth are so worn that the blade can no longer cut;
- detaching the blade from the saw frame and reattaching it by means of the other shank.
The advantages offered by the invention compared with presently known art are evident. Where objects have to be sawn that are of a thickness considerably less than the length of the active part of the blade, as soon as the blade can no longer cut because its teeth are worn, it can be reversed and attached again by the other shank so that its unworn teeth can be used. The present invention thus doubles the life of a toothed blade compared with that of blades already known.
Short description of the drawings
Further purposes and advantages of the present invention will be made clear from the following detailed description of an example already realized, and from the attached drawings provided purely for explanatory reasons and in no way limitative. Figure 1 : a front view of a blade made according to present technique. Figure 2: a front view of an alternative form of the blade in Figure 1.
Figure 3: perspective view of a small electric alternating saw onto which the blade in Figures 1 or 2 has been fitted.
Figure 4: a front view of the saw in Figure 3 used for cutting a panel, seen when the blade is at its maximum extension.
Figure 5 differs from Figure 4 in that the blade is at its minimum extension.
Figure 6: front view of the blade in Figure 2 showing a length with worn teeth.
Figures 7a, 8a, 9a: respective front views of the saw in Figure 3 in examples of its use for cutting panels of different thicknesses.
Figures 7b, 8b, 9b: respective front views of the blade in Figure 3, fitted onto the saws in Figures 7a, 8a and 9a, each at the end of its working life.
Figure 10: a front view of a blade made according to the present invention.
Figure 11 : a front view of an alternative form of the blade in Figure 10. Figure 12: a front view of an electric alternating saw with the blade in Figure
11 fitted onto it, showing an example of its use in sawing a panel.
Detailed description of some preferred realizations of the invention
Figures 10 and 11 show two types of blade, 40a and 40b, for alternating electric saws such as the model illustrated in Figure 3. In Figure 10 the
* blade 40a is shown as consisting of a metal bar of a length greater than the thickness, comprising a body 41, a first shank 42a formed at one end of the blade, and a second shank 43 a at the end opposite to that with the first shank
42a. The body 41 has a toothed profile of LD length on one longitudinal edge. Each shank is provided with a connecting end for fitting the blade onto a means for operating the saw (not shown in the drawing). Holes 46 of different diameters are made through the connecting end 45 a, said holes being aligned in the direction of the blade 40a. Figure 11 shows a blade 40b that differs from blade 40a in Figure 10 as the shanks 42b and 43b at the ends are of a different type, each having its own connection 45b whose profile, on both sides, comprises a projection 47 contiguous to a recess 48. Each blade, 40a and 40b, can be fitted onto blade-pushing means inside the frame of the alternating electric saw at one or other of its shanks. Figure 12 shows one of the alternating electric saws 15 available on the market, such as the Bosch "Professional" model GST 75 BE, with the blade 40b, used for cutting a wooden panel 25 of S thickness, fitted onto it and seen in the case illustrated by Figures 9a and 9b.
As stated when referring to Figure 9a, in which the saw 15 is used for cutting objects of S thickness, a thickness greatly inferior to the length of the body 41 of blade 40b, during use the blade becomes worn along an extremely short section 49, a length equivalent to the sum of thickness S of the panel 25, and the travel E made by the blade 40b imposed on it by the saw 15. When the teeth 44 become so worn that they can no longer cut, the blade is removed from its seat, reversed and fitted on again using the other shank 43b. In this way the cutting operation can be resumed using the same blade. Having reversed the blade, as shown in Figure 12, the worn section 49 in fact lies on that part of blade 40b which is no longer involved in cutting. This reversal of the double shank-ended blade achieves its effect when thickness S of the panel 25 complies with the expression S < Vi *LD - E. The above description refers to realization of a preferred example of a blade with a toothed profile. The present invention obviously can also apply to realization of a blade with a smooth, abrasive and /or high precision profile, to realization of blades with connecting means different from those described as well as to blades with cutting edges on both sides. Considering the description given of a preferred example of realization of the present invention, it is clear that changes can be made to it by experts in the field without departing from its sphere as will appear from the following claims.

Claims

1. A blade (40a, 40b) for an alternating electric saw (15) comprising:
- a metal bar (41) of a length greater than its thickness, having at least one longitudinal toothed edge (44); - first means (42a, 2b) for holding the blade to means inside the saw (15), for moving the blade, said holding means being made at a first end of said metal bar (41); wherein are comprised second means (43a, 43b) for holding the blade to said means inside the saw (15) for moving it, said second holding means being made at the other end of said metal bar (41).
2. The blade (40a, 40b) as in claim 1, wherein said first and second holding means (42a, 42b, 43a, 43b) respectively comprise a shank through whose profile, on both sides, there is at least one hole (46).
3. The blade (40a, 40b) as in claim 1, wherein said first and second holding means (42a, 42b, 43a, 43b) respectively comprise a shank along whose profile, on both sides, there is at least one projection (47) contiguous to a recess (48).
4. The blade (40a, 40b) as in claim 1, wherein said first and second holding means (42a, 42b, 43a, 43b) respectively comprise a shank having at least one engaging tooth fixed to one face of the shank.
5. Method for cutting a panel (25) of wood, or of some comparably hard material, using an alternating electric saw (15) wherein the following are comprised: a blade (40a, 40b) having at least one toothed edge and two shanks (42a, 42b, 43a, 43b) for connecting the blade to the saw, one connecting means being made at each end of the blade; said panel (25) the S thickness of which is less than the difference between half the length (LD) of the toothed edge and the travel (E) made by the blade (40a, 40b) inside the saw; - cutting the panel (25) using said blade until its teeth (44) are so worn that they can no longer make a cut; detaching the blade (40a, 40b) from the push rod inside the saw (15) and reattaching it at the position of the other shank.
PCT/IT2008/000758 2008-09-23 2008-12-10 Blade, connectable at both ends, for small alternating electric saws WO2010035297A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2008A001681 2008-09-23
IT001681A ITMI20081681A1 (en) 2008-09-23 2008-09-23 "BLADE FOR ALTERNATIVE ELECTRIC SAWS EQUIPPED WITH ATTACK TO BOTH EXTREMITIES"

Publications (1)

Publication Number Publication Date
WO2010035297A1 true WO2010035297A1 (en) 2010-04-01

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PCT/IT2008/000758 WO2010035297A1 (en) 2008-09-23 2008-12-10 Blade, connectable at both ends, for small alternating electric saws

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IT (1) ITMI20081681A1 (en)
WO (1) WO2010035297A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8926410B2 (en) 2009-03-02 2015-01-06 Irwin Industrial Tool Company Reciprocating saw blade with tangs on each end and related method
US9884380B2 (en) 2014-06-20 2018-02-06 Black & Decker Inc. Saw blade with multiple tangs

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3314456A (en) * 1963-12-10 1967-04-18 Capewell Mfg Company Reciprocating saw blade with burnishing edge
DE8702721U1 (en) * 1987-02-21 1987-04-16 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Saw blade for jigsaws
DE29607673U1 (en) * 1996-04-27 1997-08-28 Scintilla Ag, Solothurn Jigsaw blade

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3314456A (en) * 1963-12-10 1967-04-18 Capewell Mfg Company Reciprocating saw blade with burnishing edge
DE8702721U1 (en) * 1987-02-21 1987-04-16 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Saw blade for jigsaws
DE29607673U1 (en) * 1996-04-27 1997-08-28 Scintilla Ag, Solothurn Jigsaw blade

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8926410B2 (en) 2009-03-02 2015-01-06 Irwin Industrial Tool Company Reciprocating saw blade with tangs on each end and related method
US9737943B2 (en) 2009-03-02 2017-08-22 Irwin Industrial Tool Company Reciprocating saw blade with tangs on each end and related method
US10618124B2 (en) 2009-03-02 2020-04-14 Black & Decker Inc. Reciprocating saw blade
US11794262B2 (en) 2009-03-02 2023-10-24 Black & Decker Inc. Reciprocating saw blade
US9884380B2 (en) 2014-06-20 2018-02-06 Black & Decker Inc. Saw blade with multiple tangs
US10646937B2 (en) 2014-06-20 2020-05-12 Black & Decker Inc. Saw blade with multiple tangs and methods of use

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