CA2016563A1 - Circular saw blade with exchangeable work performing elements - Google Patents
Circular saw blade with exchangeable work performing elementsInfo
- Publication number
- CA2016563A1 CA2016563A1 CA 2016563 CA2016563A CA2016563A1 CA 2016563 A1 CA2016563 A1 CA 2016563A1 CA 2016563 CA2016563 CA 2016563 CA 2016563 A CA2016563 A CA 2016563A CA 2016563 A1 CA2016563 A1 CA 2016563A1
- Authority
- CA
- Canada
- Prior art keywords
- saw blade
- circular saw
- bushing
- legs
- mounting fork
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
Links
Abstract
TITLE OF THE INVENTION
CIRCULAR SAW BLADE WITH EXCHANGEABLE WORK PERFORMING ELEMENTS
ABSTRACT OF THE DISCLOSURE
A circular saw blade, especially for stone or rock cutting, has a blade body to which exchangeable work performing elements are attached through a mounting fork riding with its legs on attachment pieces secured to the blade body. A threaded connection secures the legs of the mounting fork to the respective attachment piece. The threaded connection has a bushing with an internal thread and a screw bolt engaging the internal thread of the bushing which passes through aligned holes, through the legs of the mounting fork, and through the attachment piece.
2475/ar
CIRCULAR SAW BLADE WITH EXCHANGEABLE WORK PERFORMING ELEMENTS
ABSTRACT OF THE DISCLOSURE
A circular saw blade, especially for stone or rock cutting, has a blade body to which exchangeable work performing elements are attached through a mounting fork riding with its legs on attachment pieces secured to the blade body. A threaded connection secures the legs of the mounting fork to the respective attachment piece. The threaded connection has a bushing with an internal thread and a screw bolt engaging the internal thread of the bushing which passes through aligned holes, through the legs of the mounting fork, and through the attachment piece.
2475/ar
Description
1 E`IELD OF THE INVENTION
The invention relates to circular saw blades with exchangeable work performing elements, especially for use in industrial type stone and rock saws.
BACKGROUND INFORMATION
Canadian Serial No.~ , filed in the Canadian Patent Office on February 16, 1990, by the inventors: Manfred Fuerst and Erwin Schumacher, and entitled: Circular Saw Blade, discloses a circular saw blade having a blade body made as a laminated structure of fiber reinforced synthetic materials. The individual layers are made up of sec-tors that abut each other in the same layer. Neighboring layers are angularly displaced relatlve to each other so that the butt joints are overlapped by at least one neighboring layer sector. By angularly displacing the abut-ting joints relative to one another from layer-to-layer an im-proved strength is achieved. Compared to a circular saw blade having a blade body made of steel, the fiber reinforced blades are generating less noise while having the same material strength and stiffness. Additionally, the construction of several fiber reinforced layers for the blade body is possible with relatively small manufacturing expenses so that the structural investment for making such fiber reinforced circular saw blade can be main-tained low. However, with regard to the requirement tha-t work performing elements must be easily exchangeable, the problem arises that a releasable connection must be provided between the work performing elements and the attachment pieces which are secured to the circumference of the blade body. This releasable connection must assure the desired exchangeability 1 releasable connection must assure the desired exchanyeability of the work performing elements on the one hand, while on the other hand it must guaranty the required connection safety so that the work per.~orming elements cannot break out of the saw blade during operation. For this purpose it is necessary that the connecting means assure a maximum of force transmission between the work performing elements and the saw blade body, and this must be accomplished in a relatively narrow available space which is limited by the thickness of the blade body.
OBJECTS OF THE INVENTION
In view of the foregoing it is the aim of the invention to achieve the following objects singly or in combinatlon:
to construct a saw blade, especially a rock or stone circular saw blade so that it satisfies the above mentioned requirements in an optimal way, yet with a small structural efEort and expense;
to connect the work perEorrning elements, such as cuttlng or grinding elements, to the body oE the saw blade with a threaded connection so that these work perform-ing elements can be easily and ind:ividually replaced; and to provide a connection of the work performing elements to a saw blade body which is equally applicable to metal saw blade bodies and to synthetic material layered saw blade bodies.
i3 1 SUM~RY OF THE INVENTION
A circular saw blade according to the invention is character-ized in that the individual cutting or grinding element is connected with its corresponding attachmentpiece by a mount-ing fork having two legs riding in an overlapping manner on the respective attachment piece. A threaded connection is provided between the mounting fork and the attachment piece.
For this purpose through-holes aligned with each other pass through the legs of the mounting fork and through the attach-ment piece. A bushing with an internal threading passesthrough the aligned holes and a threaded bolt passes into the threaded bushing so that the bushing bears with its flange or flat head against one side of a mounting leg while the threaded bolt bears with its flat head against the other side of the respective leg of the mounting fork.
The invention recognizes that the required forces can be taken up effectively by the overlap of the fork legs on both sides of the attachment piece in combination with the threaded connection which assures for each individual work performing element a desired screw-on pressure between the respective attachment piece and the corresponding mounting fork. The screw-on pressure is introduced approximately into the entire mounting width that is determined by the thickness of the blade body. Such pressure distribution makes it possible for the connection to take up the required forces which can be quite large in this type of saw blade.
s~
1 Preferably, each work perEorming element has its own mounting fork.
An improved pressureor force transmission is obtained by a location fit between the inwardly facing surfaces of the legs of the mounting fork and the outwardly facing surface of the respective attachment piece. The gap width between the legs of the mounting fork is dimensioned with due regard to the thickness of the attachment piece to assure such location fit. Similarly, a loca-tion fit should be provided between the bushing and the through-holes in the legs of the mounting fork and the attachment piece. By locating the flat head or flange of the th r e a de d bushing and the flat head of the screw bolt entirely in a respective recess, the surfaces of the connection remains aerodynamically satis-factory without increasing the saw blade noise during operation. Even the recessed screw head and recessed bushing flange can easily be loosened or tightened by a tool by providing respective tool pins.
BRIEF DESCRIPTION OF THE DRAWING
In order that the invention may be clearly understood, it will now be described, by way of example, with reference to the accompanying drawing in whi.ch the single figure is a view partially in section, through a connecting structure according to the invention, whereby the sectional plane extends radially through the saw blade.
OF THE BEST ~ODE OF T~E INVENTION
The sectional view of the single figure shows a blade body 1 with individual layers 1.1 and 1.2. An attachment piece 2 is secured to the blade body 1 in the manner described in more detail in the above mentioned copending application Canadian Serial No.~ . The layers 1.1 and 1.2 are, for example, made of fiber reinforced synthetic materials in which the attachment element 2 of metal is embecdded. A
work performing element 5, such as a cutting tip or a grind-ing element, is secured to the blade body 1 in accordance with the invention by means of a mounting fork 6. The ele-ment 5, for example, of diamond or some other material suit-able for stone working, is secured to the mounting fork 6 in a conventional manner, for example, by a suitable aclhesive.
The mounting fork 6 has a through-hole 6.3 in its upper portion for the insertion of a tool for removing the mount--ing fork 6 from the attachment piece 2. Further, -the mount-ing fork 6 has two legs 6.2 and 6.2'. The mounting fork 6 rides on the attachment piece 2 so that the legs 6.2 ancl 6.2' overlap both sides o:E the attachment piece 2. The mounting fork has a through-hole 6.1 in each of its legs 6.2, 6.2'.
The attachment piece 2 also has a throuyh-hole 2.2 which is registering with the two through-holes 6.1 in the legs of the mount.illg fork. The mounting :Eork 6 is rigidly secured to the attachment piece 2 by a bushing 7 cooperating with a threaded bolt 8. The bushing 7 has a bushing section 7.2 1 and a flange type flat head 7.1. The bushing section 7.2 has a threaded through-hole 7.4. The screw bol-t 8 has an external threading engaging the internal threading 7.4.
The screw bolt 8 also has a flat head 8.1. The leg 6.2 has a recess 6.4 in which the flat head 8.1 is received. The leg 6.2' has a recess 6.5 in which the flange type flat head 7.1 is received.
The spacing between the legs 6.2 and 6.2' is so dimensioned relative to the width or thickness of the attachment piece 2 that the mounting fork 6 rides with a location fit on the attachment piece 2. This feature makes sure that a force transmission friction fit is provided when the screw bolt 8 is tightened in the threaded bushing 7. As a result, the connection of the mounting fork 6 with the attachment piece 2 can take up even loads that are effective in the axial direc-tion of the screw connection formed by -the screw bolt 8 and the threaded bushing 7, in addition to radial loads.
A further location fit is provided between the bushing sec-tion 7.2 and the holes 6.1 and 2.2. ~'or this purpose the outer diameter of -the bushing section 7.2 is dimensioned with due regard to the diameter of the holes 6.1 and 2.2.
The bushing section 7.2 has such an axial length that it leaves a ring space 7.5 between the axially inwardly facing end of the bushing section 7.2 and -the inwardly facing sur-face of the head 8.1 of the screw bolt 8. Thus, tightening ``" 2@~ 63 1 of the connection is assured. Simultaneously, the length of the bushing section 7.~ is such that it is subjected to a shearing load in two planes. In other words, the axially inner end of the bushing section 7.2 .reaches far enough into the holes so that the wall of the right-hand hole 6.1 bears against the circumference of the axially inner end of the bushing section 7.2. As mentioned, it is preferable that a location fit is provided between all the three holes on the one hand, and the outer surface of the bushing section 7.2.
The flange 7.1 of the bushing 7 is provided with two or more holes 7O3 for the insertion of a tool. Similarly, the flat head 8.1 of the screw bolt 8 is provided with two or more holes 8.2 for the insertion of a tool. Thus, the tightening or loosening of the threaded connection is assured.
Incidentally, the construction is such that the mlrror~sym-metrical arrangement permits the insertion of the sleeve from either side. Similarly, the flat head screw bolt 8 can be lnserted from either side.
Although the invention has been described wlth reference to specific example embodiments, it will be appreciated that it is intended to cover all modifications and equiva-lents within the scope of the appended claims.
The invention relates to circular saw blades with exchangeable work performing elements, especially for use in industrial type stone and rock saws.
BACKGROUND INFORMATION
Canadian Serial No.~ , filed in the Canadian Patent Office on February 16, 1990, by the inventors: Manfred Fuerst and Erwin Schumacher, and entitled: Circular Saw Blade, discloses a circular saw blade having a blade body made as a laminated structure of fiber reinforced synthetic materials. The individual layers are made up of sec-tors that abut each other in the same layer. Neighboring layers are angularly displaced relatlve to each other so that the butt joints are overlapped by at least one neighboring layer sector. By angularly displacing the abut-ting joints relative to one another from layer-to-layer an im-proved strength is achieved. Compared to a circular saw blade having a blade body made of steel, the fiber reinforced blades are generating less noise while having the same material strength and stiffness. Additionally, the construction of several fiber reinforced layers for the blade body is possible with relatively small manufacturing expenses so that the structural investment for making such fiber reinforced circular saw blade can be main-tained low. However, with regard to the requirement tha-t work performing elements must be easily exchangeable, the problem arises that a releasable connection must be provided between the work performing elements and the attachment pieces which are secured to the circumference of the blade body. This releasable connection must assure the desired exchangeability 1 releasable connection must assure the desired exchanyeability of the work performing elements on the one hand, while on the other hand it must guaranty the required connection safety so that the work per.~orming elements cannot break out of the saw blade during operation. For this purpose it is necessary that the connecting means assure a maximum of force transmission between the work performing elements and the saw blade body, and this must be accomplished in a relatively narrow available space which is limited by the thickness of the blade body.
OBJECTS OF THE INVENTION
In view of the foregoing it is the aim of the invention to achieve the following objects singly or in combinatlon:
to construct a saw blade, especially a rock or stone circular saw blade so that it satisfies the above mentioned requirements in an optimal way, yet with a small structural efEort and expense;
to connect the work perEorrning elements, such as cuttlng or grinding elements, to the body oE the saw blade with a threaded connection so that these work perform-ing elements can be easily and ind:ividually replaced; and to provide a connection of the work performing elements to a saw blade body which is equally applicable to metal saw blade bodies and to synthetic material layered saw blade bodies.
i3 1 SUM~RY OF THE INVENTION
A circular saw blade according to the invention is character-ized in that the individual cutting or grinding element is connected with its corresponding attachmentpiece by a mount-ing fork having two legs riding in an overlapping manner on the respective attachment piece. A threaded connection is provided between the mounting fork and the attachment piece.
For this purpose through-holes aligned with each other pass through the legs of the mounting fork and through the attach-ment piece. A bushing with an internal threading passesthrough the aligned holes and a threaded bolt passes into the threaded bushing so that the bushing bears with its flange or flat head against one side of a mounting leg while the threaded bolt bears with its flat head against the other side of the respective leg of the mounting fork.
The invention recognizes that the required forces can be taken up effectively by the overlap of the fork legs on both sides of the attachment piece in combination with the threaded connection which assures for each individual work performing element a desired screw-on pressure between the respective attachment piece and the corresponding mounting fork. The screw-on pressure is introduced approximately into the entire mounting width that is determined by the thickness of the blade body. Such pressure distribution makes it possible for the connection to take up the required forces which can be quite large in this type of saw blade.
s~
1 Preferably, each work perEorming element has its own mounting fork.
An improved pressureor force transmission is obtained by a location fit between the inwardly facing surfaces of the legs of the mounting fork and the outwardly facing surface of the respective attachment piece. The gap width between the legs of the mounting fork is dimensioned with due regard to the thickness of the attachment piece to assure such location fit. Similarly, a loca-tion fit should be provided between the bushing and the through-holes in the legs of the mounting fork and the attachment piece. By locating the flat head or flange of the th r e a de d bushing and the flat head of the screw bolt entirely in a respective recess, the surfaces of the connection remains aerodynamically satis-factory without increasing the saw blade noise during operation. Even the recessed screw head and recessed bushing flange can easily be loosened or tightened by a tool by providing respective tool pins.
BRIEF DESCRIPTION OF THE DRAWING
In order that the invention may be clearly understood, it will now be described, by way of example, with reference to the accompanying drawing in whi.ch the single figure is a view partially in section, through a connecting structure according to the invention, whereby the sectional plane extends radially through the saw blade.
OF THE BEST ~ODE OF T~E INVENTION
The sectional view of the single figure shows a blade body 1 with individual layers 1.1 and 1.2. An attachment piece 2 is secured to the blade body 1 in the manner described in more detail in the above mentioned copending application Canadian Serial No.~ . The layers 1.1 and 1.2 are, for example, made of fiber reinforced synthetic materials in which the attachment element 2 of metal is embecdded. A
work performing element 5, such as a cutting tip or a grind-ing element, is secured to the blade body 1 in accordance with the invention by means of a mounting fork 6. The ele-ment 5, for example, of diamond or some other material suit-able for stone working, is secured to the mounting fork 6 in a conventional manner, for example, by a suitable aclhesive.
The mounting fork 6 has a through-hole 6.3 in its upper portion for the insertion of a tool for removing the mount--ing fork 6 from the attachment piece 2. Further, -the mount-ing fork 6 has two legs 6.2 and 6.2'. The mounting fork 6 rides on the attachment piece 2 so that the legs 6.2 ancl 6.2' overlap both sides o:E the attachment piece 2. The mounting fork has a through-hole 6.1 in each of its legs 6.2, 6.2'.
The attachment piece 2 also has a throuyh-hole 2.2 which is registering with the two through-holes 6.1 in the legs of the mount.illg fork. The mounting :Eork 6 is rigidly secured to the attachment piece 2 by a bushing 7 cooperating with a threaded bolt 8. The bushing 7 has a bushing section 7.2 1 and a flange type flat head 7.1. The bushing section 7.2 has a threaded through-hole 7.4. The screw bol-t 8 has an external threading engaging the internal threading 7.4.
The screw bolt 8 also has a flat head 8.1. The leg 6.2 has a recess 6.4 in which the flat head 8.1 is received. The leg 6.2' has a recess 6.5 in which the flange type flat head 7.1 is received.
The spacing between the legs 6.2 and 6.2' is so dimensioned relative to the width or thickness of the attachment piece 2 that the mounting fork 6 rides with a location fit on the attachment piece 2. This feature makes sure that a force transmission friction fit is provided when the screw bolt 8 is tightened in the threaded bushing 7. As a result, the connection of the mounting fork 6 with the attachment piece 2 can take up even loads that are effective in the axial direc-tion of the screw connection formed by -the screw bolt 8 and the threaded bushing 7, in addition to radial loads.
A further location fit is provided between the bushing sec-tion 7.2 and the holes 6.1 and 2.2. ~'or this purpose the outer diameter of -the bushing section 7.2 is dimensioned with due regard to the diameter of the holes 6.1 and 2.2.
The bushing section 7.2 has such an axial length that it leaves a ring space 7.5 between the axially inwardly facing end of the bushing section 7.2 and -the inwardly facing sur-face of the head 8.1 of the screw bolt 8. Thus, tightening ``" 2@~ 63 1 of the connection is assured. Simultaneously, the length of the bushing section 7.~ is such that it is subjected to a shearing load in two planes. In other words, the axially inner end of the bushing section 7.2 .reaches far enough into the holes so that the wall of the right-hand hole 6.1 bears against the circumference of the axially inner end of the bushing section 7.2. As mentioned, it is preferable that a location fit is provided between all the three holes on the one hand, and the outer surface of the bushing section 7.2.
The flange 7.1 of the bushing 7 is provided with two or more holes 7O3 for the insertion of a tool. Similarly, the flat head 8.1 of the screw bolt 8 is provided with two or more holes 8.2 for the insertion of a tool. Thus, the tightening or loosening of the threaded connection is assured.
Incidentally, the construction is such that the mlrror~sym-metrical arrangement permits the insertion of the sleeve from either side. Similarly, the flat head screw bolt 8 can be lnserted from either side.
Although the invention has been described wlth reference to specific example embodiments, it will be appreciated that it is intended to cover all modifications and equiva-lents within the scope of the appended claims.
Claims (8)
1. A circular saw blade with exchangeable work performing elements, comprising a blade body, attachment pieces secured to said blade body, mounting fork means for securing at least one work performing element to each of said attachment pieces, said mounting fork means having two legs riding on at least one of said attachment pieces, aligned through-holes passing through said legs and through said attachment pieces, and threaded securing means passing through said through-holes for securing said mounting fork means to said attachment piece or pieces.
2. The circular saw blade of claim 1, wherein said threaded securing means comprise a bushing with a flat flange head and with a threaded through-bore, said bushing passing through said through-holes, and a threaded bolt with a flat head, said threaded bolt passing through said threaded bore in said bushing.
3. The circular saw blade of claim 2, wherein said flat flange head bushing has an outer bushing diameter sitting in said through-holes of said legs and of said attachment pieces with a location fit.
4. The circular saw blade of claim 2, wherein said legs of said mounting fork form a gap having a gap width pro-viding a location fit of said legs on said attachment piece.
5. The circular saw blade of claim 2, wherein said legs of said mounting fork have outwardly facing recesses in which said flat flange head of said bushing and said flat head of said threaded bolt are received to be flush with an outer surface of said legs of said mounting fork.
6. The circular saw blade of claim 2, wherein said flat head of said bushing and said flat head of said bolt comprise holes for insertion of a tool.
7. The circular saw blade of claim 1, wherein said mounting fork comprises at least one tool insertion hole or recess.
8. The circular saw blade of claim 1, wherein said blade body is made of a plurality of fiber reinforced synthetic material layers.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19893915695 DE3915695A1 (en) | 1989-02-16 | 1989-05-13 | Laminated fibre reinforced plastics circular saw - includes bolted-on cutters permitting easy replacement |
| DEP3915695.8 | 1989-05-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2016563A1 true CA2016563A1 (en) | 1990-11-13 |
Family
ID=6380624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2016563 Abandoned CA2016563A1 (en) | 1989-05-13 | 1990-05-11 | Circular saw blade with exchangeable work performing elements |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2016563A1 (en) |
| IT (1) | IT1239966B (en) |
-
1990
- 1990-05-10 IT IT20263A patent/IT1239966B/en active IP Right Grant
- 1990-05-11 CA CA 2016563 patent/CA2016563A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| IT9020263A1 (en) | 1991-11-10 |
| IT1239966B (en) | 1993-11-27 |
| IT9020263A0 (en) | 1990-05-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |