CA1228754A - Floating wear pads - Google Patents
Floating wear padsInfo
- Publication number
- CA1228754A CA1228754A CA000477066A CA477066A CA1228754A CA 1228754 A CA1228754 A CA 1228754A CA 000477066 A CA000477066 A CA 000477066A CA 477066 A CA477066 A CA 477066A CA 1228754 A CA1228754 A CA 1228754A
- Authority
- CA
- Canada
- Prior art keywords
- wear pad
- floating
- floating wear
- belville
- sub base
- 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.)
- Expired
Links
Landscapes
- Drilling Tools (AREA)
Abstract
ABSTRACT OF DISCLOSURE
A wear pad for a cutting tool is disclosed. The wear pad is spring loaded by means of belville washers that may be reloaded so that a relatively large force results for any movement of the wear pad. The spring loaded wear pad is used with two conventional fixed wear pads on a tool, for example used in deep boring intersecting holes. The spring loaded wear pad stabilizes the drill when drilling intersecting holes and holes that are disclosed at right angles to one another and also stabilizes the drill when starting new holes.
A wear pad for a cutting tool is disclosed. The wear pad is spring loaded by means of belville washers that may be reloaded so that a relatively large force results for any movement of the wear pad. The spring loaded wear pad is used with two conventional fixed wear pads on a tool, for example used in deep boring intersecting holes. The spring loaded wear pad stabilizes the drill when drilling intersecting holes and holes that are disclosed at right angles to one another and also stabilizes the drill when starting new holes.
Description
2Z~ 54 B~CKGROUNV OF INVENTION
2 s problem has long existed in connection with drilling holes which intersect. One purpose of the invention is for the stabilizing of the drill for drilling through cross holes at 90. Drilling cross holes at 45 or any other angle is also 5 fit a problem. Starting the drilling of large holes is also a problem. The present G Al invention stabilizes the drill when starting a hole in a flat surface. The stabilizing of the drill when the drill pressure is reduced at the termination point of the drill S 1¦ hole is also important. Previously in drilling cross holes it was common practice 9 I to plug the hole with wood, steel or other substance to stabilize the drill. The 10 ,, present invention solves the prowls problems aforesaid and results in better tool life and improvement in starting the drill and avoids chatter of the drill on the 12 ! work. Two screws are provided on the present wear pad to prevent it from rotating.
?, I Applicant uses a third screlv and n belviIle washer for the spring. This reduces of 14 I the space required for a helical spring.
16 it SUMMARY OF THE INVENTION
17 Jo The invention provides a floating wear pad which may be used with US ¦ two stationary wear pads on a boring tool. The floating wear pad aids in stabilizing 19 " the brine tool during starting and when the tool passes through the workout the end 20 1! of a cut stabilizing the drill when boring cross holes at 900 or in boring cross holes 21 ¦¦ 45 to one another, or any other angle.
I
I!
I If, REFERENCE TO PRIOR ART
21, applicant is not aware of any spring loaded wear pad used yin machine '>:~ I, tool drills or other similar world. ~ppticant is familiar with ordinary fixed wear ;
pads slush as shown in lo Patent 3,191,463. Other Patents known to applicant I if are Patent lo. 3,973,861, 3,307,254 and 4,105,360. None of these patents show US l¦ spring loaded floating wear pads.
29 lo I .. . ..
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2 if It is an object of the invention to provide an improved drill.
Another object of the invention is to provide improved wear pads for 4 ¦¦ drills.
5 l¦ Another object of the invention is to provide a drill more efficient for I drilling cross holes which will eliminate chattering of the drill.
7 nether object of the invention is to provide a floating wear pad which ¦ will stabilize a drill or cutting tool when staring holes.
l another object of the invention is to provide a stabilizing means for I) i a drill to stabilize the drill at the termination point of the drilled hole.
With the above and other objects in view, the present invention consists -I
12 if of the combination and arrangement of parts hereinafter more fully described, ¦
13 ¦ illustrated in the accompanying drawing and more particularly pointed out In the 14 ¦ appended claims, it being understood that changes may be made in the form, size, I;
16 I proportions and minor details of construction without departing from the spirit or ~;~
6 I sacrificing any of the advantage of the i-ventlon lo Al BRIEF DESCRIPTION OF EYING i 11 Fig. l is a side view of a cutting tool according to the invention 20 ¦' Fig. 2 is an end view of the cutting tool shown In Pig. l.
21 1, Fig. 3 is aye enlarged view of a part of Fig. 2.
I Al Fig. 4 is a view partly in phantom taken on line 4-4 of Fig. l.
2.) ¦¦ Fig. 5 is an enlarged partial cross sectional view taxed on line 5-5 of I ¦
24 lo Fig. 8.
I I Fig. 6 is an isometric view of a sub base pad.
Fig. 7 is an enlarged isometric view of one of the wear pads according 27 if to the invention.
US if Fig. 8 is a side view of a Melville washer.
29 Fig. 9 is an end view of the sub base shown in Fig. 6.
30, Fig. 10 is a side view c" one of the screws in holding the sub base to 31 l, the drill body.
. . .
Fig. 11 is an end view of a floating wear pad and sub base.
2 l, l Fig. 12 is a side view of one of the screws used in holding the ~:~, conventional wear pads in a stationary position.
Fig. 13 is a cross sectional view taken on line 13-13 of Fig. 4.
6 it DETAILED DESCRIPTION OF THE DRAWINGS
7 j Now with more particular reference to the drawings a cutting tool or I drill 10 is shown having a general cylindrical body 11 with a threaded shank 30 on 9 I¦ one end for attaching the drill to a boring bar or the like in a machine tool The drill has three circumferential spaced wear pads disposed around its outer periphery and circumferential spaced from the cutting edge 20 of tube Jo 12 i insert 12. The wear pads include fixed wear pads 22 and 24 and floating wear pad I 1 21. The drill has cutting inserts 12 and 13. Cutting inserts 12 and 13 are of a:
14 I conventional type which are held in place on the first end of the body 11 by damping 15 l members 14 and 15 in a familiar manner.
16 l The fixed wear pads 22 of a; conventional type of wear pads having a pad part 23 which may Abe carbide other wear resistant material brazed in a base . .. :
purity 32~ The fixed wear pads 22 are clamped to the drill body by screws 2~5. ;
19 the floating wear pads 21 have a carbide insert 23 and a bowsprit 20 ¦32 similar to the fixed wear pads 22. The floating Wear pads 21 are comprised of a I;
21 1, sub base 27 and carbide insert 23 is held to sub base 27 by a screw ~¦2a-~that~ is I Jo received in counter bored holes 3G in the wear pad part and threaded~lnto Hillel In I the sub base 27. The sub base 27 and carbide insert 23 attached to sub base 27 2~1 I, are received in the floating wear pad recess 37 and two Melville washers 26 are 2.) I, supported over each threaded hole 38 on the sub base. Headed shoulder screws 24 I 1, are provided and one of these screws 24 is supported in each Canterbury hole 17 in ;
2/ I the sub base 27 which clamp the drill body by screws 25. The Melville washers 26 US Al will be preluded by the screws 25 Which are tightened down, bringing sub base 29 1 27 into engagement with the Melville washers 26 so that the Melville washers 26 30 I! urge the floating wear pad 21 away from the sub base 27 urging the pad part 23 31 it outwardly. The Melville washers 26 have the property of exerting a large force for 32 !, 4 i! -Jo . Al ...: .
I ~LZZ~75~ .
1 I¦ a smell deflection and therefore save considerable space over the space that would 2 if be required if a helical spring or leaf spring were used for example.
", it When the drill is in operation, the outer periphery of the fixed wear 4 I pads 22 and floating wear pad 21 will be set at approximately the same radius as a if the radius of the outer periphery of the inserts 12. The floating wear pad wilt it I provide the drills with stability when drilling cross holes, drilling intersecting holes 7 ¦ l and in starting new holes. `
s I The foregoing specification sets forth the invention in its preferred, 9 I practical forms but the structure shown is capable of modification within a range 10 if of equivalents without departing from the invention which is to be understood is broadly novel as is commensurate with the appended claims.
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18 1 : I:
22 it I '1 ` :;
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.. . , :
?, I Applicant uses a third screlv and n belviIle washer for the spring. This reduces of 14 I the space required for a helical spring.
16 it SUMMARY OF THE INVENTION
17 Jo The invention provides a floating wear pad which may be used with US ¦ two stationary wear pads on a boring tool. The floating wear pad aids in stabilizing 19 " the brine tool during starting and when the tool passes through the workout the end 20 1! of a cut stabilizing the drill when boring cross holes at 900 or in boring cross holes 21 ¦¦ 45 to one another, or any other angle.
I
I!
I If, REFERENCE TO PRIOR ART
21, applicant is not aware of any spring loaded wear pad used yin machine '>:~ I, tool drills or other similar world. ~ppticant is familiar with ordinary fixed wear ;
pads slush as shown in lo Patent 3,191,463. Other Patents known to applicant I if are Patent lo. 3,973,861, 3,307,254 and 4,105,360. None of these patents show US l¦ spring loaded floating wear pads.
29 lo I .. . ..
30 Al , 2 ok 32,i .. . ..
_ ;2Z~37S4 . I
I
2 if It is an object of the invention to provide an improved drill.
Another object of the invention is to provide improved wear pads for 4 ¦¦ drills.
5 l¦ Another object of the invention is to provide a drill more efficient for I drilling cross holes which will eliminate chattering of the drill.
7 nether object of the invention is to provide a floating wear pad which ¦ will stabilize a drill or cutting tool when staring holes.
l another object of the invention is to provide a stabilizing means for I) i a drill to stabilize the drill at the termination point of the drilled hole.
With the above and other objects in view, the present invention consists -I
12 if of the combination and arrangement of parts hereinafter more fully described, ¦
13 ¦ illustrated in the accompanying drawing and more particularly pointed out In the 14 ¦ appended claims, it being understood that changes may be made in the form, size, I;
16 I proportions and minor details of construction without departing from the spirit or ~;~
6 I sacrificing any of the advantage of the i-ventlon lo Al BRIEF DESCRIPTION OF EYING i 11 Fig. l is a side view of a cutting tool according to the invention 20 ¦' Fig. 2 is an end view of the cutting tool shown In Pig. l.
21 1, Fig. 3 is aye enlarged view of a part of Fig. 2.
I Al Fig. 4 is a view partly in phantom taken on line 4-4 of Fig. l.
2.) ¦¦ Fig. 5 is an enlarged partial cross sectional view taxed on line 5-5 of I ¦
24 lo Fig. 8.
I I Fig. 6 is an isometric view of a sub base pad.
Fig. 7 is an enlarged isometric view of one of the wear pads according 27 if to the invention.
US if Fig. 8 is a side view of a Melville washer.
29 Fig. 9 is an end view of the sub base shown in Fig. 6.
30, Fig. 10 is a side view c" one of the screws in holding the sub base to 31 l, the drill body.
. . .
Fig. 11 is an end view of a floating wear pad and sub base.
2 l, l Fig. 12 is a side view of one of the screws used in holding the ~:~, conventional wear pads in a stationary position.
Fig. 13 is a cross sectional view taken on line 13-13 of Fig. 4.
6 it DETAILED DESCRIPTION OF THE DRAWINGS
7 j Now with more particular reference to the drawings a cutting tool or I drill 10 is shown having a general cylindrical body 11 with a threaded shank 30 on 9 I¦ one end for attaching the drill to a boring bar or the like in a machine tool The drill has three circumferential spaced wear pads disposed around its outer periphery and circumferential spaced from the cutting edge 20 of tube Jo 12 i insert 12. The wear pads include fixed wear pads 22 and 24 and floating wear pad I 1 21. The drill has cutting inserts 12 and 13. Cutting inserts 12 and 13 are of a:
14 I conventional type which are held in place on the first end of the body 11 by damping 15 l members 14 and 15 in a familiar manner.
16 l The fixed wear pads 22 of a; conventional type of wear pads having a pad part 23 which may Abe carbide other wear resistant material brazed in a base . .. :
purity 32~ The fixed wear pads 22 are clamped to the drill body by screws 2~5. ;
19 the floating wear pads 21 have a carbide insert 23 and a bowsprit 20 ¦32 similar to the fixed wear pads 22. The floating Wear pads 21 are comprised of a I;
21 1, sub base 27 and carbide insert 23 is held to sub base 27 by a screw ~¦2a-~that~ is I Jo received in counter bored holes 3G in the wear pad part and threaded~lnto Hillel In I the sub base 27. The sub base 27 and carbide insert 23 attached to sub base 27 2~1 I, are received in the floating wear pad recess 37 and two Melville washers 26 are 2.) I, supported over each threaded hole 38 on the sub base. Headed shoulder screws 24 I 1, are provided and one of these screws 24 is supported in each Canterbury hole 17 in ;
2/ I the sub base 27 which clamp the drill body by screws 25. The Melville washers 26 US Al will be preluded by the screws 25 Which are tightened down, bringing sub base 29 1 27 into engagement with the Melville washers 26 so that the Melville washers 26 30 I! urge the floating wear pad 21 away from the sub base 27 urging the pad part 23 31 it outwardly. The Melville washers 26 have the property of exerting a large force for 32 !, 4 i! -Jo . Al ...: .
I ~LZZ~75~ .
1 I¦ a smell deflection and therefore save considerable space over the space that would 2 if be required if a helical spring or leaf spring were used for example.
", it When the drill is in operation, the outer periphery of the fixed wear 4 I pads 22 and floating wear pad 21 will be set at approximately the same radius as a if the radius of the outer periphery of the inserts 12. The floating wear pad wilt it I provide the drills with stability when drilling cross holes, drilling intersecting holes 7 ¦ l and in starting new holes. `
s I The foregoing specification sets forth the invention in its preferred, 9 I practical forms but the structure shown is capable of modification within a range 10 if of equivalents without departing from the invention which is to be understood is broadly novel as is commensurate with the appended claims.
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Claims (11)
1. A cutting tool for machining holes in workpieces comprising a generally cylindrical body, at least one cutting means on said body, a recess in the outer periphery of said body, a floating wear pad received in said recess, a belville washer disposed in said recess under said floating wear pad and limit means holding said floating wear pad in engagement with said belville washer whereby the radial outward movement of said floating wear pad is limited and said belville washer is preloaded, allowing the floating wear pad to be forced radially inwardly a limited amount by the force of said belville washer.
2. The tool recited in Claim 1 wherein said limit means supporting said floating wear pad on said belville washer comprises a screw extending through a bore in said floating wear pad and through said belville washer, said screw having a head limiting the movement of said floating wear pad radially outwardly of said body.
3. The tool recited in Claim 2 wherein two said belville washers are supported one at each side of the center of said floating wear pad, said bore has a counterbore, and said screw is a headed screw with head thereof received in said counterbore.
4. The tool recited in Claim 2 wherein at least one fixed wear pad is fixed to said body and circumferentially spaced from said floating wear pad.
5. The tool recited in Claim 5 wherein said recess is an elongated recess, a sub base is attached to said tool by two spaced screws and said floating wear pad is attached to said sub base by a central screw equally spaced from the ends of said wear pad, two belville washers are provided, one under each said screw.
6. The tool recited in Claim 1 wherein two fixed wear pads are fixed to the body and circumferentially spaced from said floating wear pads.
7. The tool recited in Claim 6 wherein said floating wear pad comprises a rectangular sub base and a wear pad part attached to said sub base, counterbored holes in said sub base, headed screws each having a shoulder are disposed in said counterbored holes threadably attaching said floating wear pad to said body.
8. cutting tool comprising a generally cylindrical body having a first end and a second end, drive means on said first end for attaching said tool to a driving member, cutting means on said second end of said body, a floating wear pad means axially spaced from said cutting means, said floating wear pad means comprising, elongated recess in said outer periphery of said body, at least one threaded hole in said body, a threaded shouldered screw extending through said floating wear pad means, a belville washer between said floating wear pad means and said body, said threaded headed screw extending through said belville washer and through said wear pad limiting the outward movement of said floating wear pad from said body and holding said floating wear pad means in engagement with said belville washer whereby said belville washer may be deflected when said floating wear pad means is forced inwardly.
9. The cutting tool recited in Claim 8 wherein at least one fixed pad is fixed to said body and circumferentially spaced in relation to said floating .
wear pad and axially spaced from said cutting insert.
wear pad and axially spaced from said cutting insert.
10. The tool recited in Claim 9 wherein said floating wear pad.
comprises a sub base, said headed threaded screw is supported in said sub base, a wear resistant means made of a hard material is supported on said.
sub base with said belville washer between.
comprises a sub base, said headed threaded screw is supported in said sub base, a wear resistant means made of a hard material is supported on said.
sub base with said belville washer between.
11. The wear pad recited in Claim 10 wherein two said belville washers support said sub base between said wear pad and said body.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US63282784A | 1984-07-20 | 1984-07-20 | |
| US632,827 | 1990-12-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1228754A true CA1228754A (en) | 1987-11-03 |
Family
ID=24537123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000477066A Expired CA1228754A (en) | 1984-07-20 | 1985-03-21 | Floating wear pads |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1228754A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8439566B2 (en) | 2010-03-09 | 2013-05-14 | Caterpillar Global Mining Equipment Llc | Wear pad adjustment assembly |
-
1985
- 1985-03-21 CA CA000477066A patent/CA1228754A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8439566B2 (en) | 2010-03-09 | 2013-05-14 | Caterpillar Global Mining Equipment Llc | Wear pad adjustment assembly |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |