Patent US3852874A successfully refreshed from Google Patents.
US3852874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of inserting buttons in a drilling head
Assignee: SMITH WILLISTON Inc
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Filing: 1973-12-10
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Granted: 1974-12-10
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Expires: 1993-12-10
Abstract
Abstract A button and sleeve have matching tapers and are pressed together so that in a working configuration the external diameter of the sleeve is stretched to slightly exceed the diameter of the bore into which the combined assembly is to be inserted. The sleeve is then partially removed from the button to relax its external diameter so that the combined assembly can be placed into the bore. The bit and sleeve are then pressed into the working configuration in the bore until the sleeve has expanded radially into tight contact with the inner wall of the bore and the button has seated itself on the end wall of the bore. A button and sleeve assembly are pressed together and have matching surfaces which cause the exterior dimension of the sleeve to exceed that of the bore into which the assembly is to be inserted when the button and sleeve are combined together in a working configuration. The sleeve and button matched surfaces, however, are dimensioned to allow the external dimension of the sleeve to shrink to a dimension less than the inner dimension of the bore when the sleeve is partially removed from the button.
Inventors
- 👤 B Pearson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:28
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/62; B; B23; B23P; B23P11/00; B23P11/005; B23P11/02; E21B10/46; E21B10/56; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49945; Y10T29/49947
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
215 words
A method of installing and holding an externally tapered button in a cylindrical bore in a drilling head by means of an internally tapered metal expansion sleeve, comprising; forming the sleeve with its outer surface oversized relative to the sidewall surface of the bore and with its inside surface generally the same shape as the tapered outer surface of the button and undersized relative thereto, axially pressing the sleeve and button together into a normal working relationship and, while in said relationship, shaping the outer surface of the sleeve to generally the same shape as the sidewall surface of the bore and to a size that is oversized relative to said sidewall surface while the sleeve and button are fully pressed together and that is undersized relative to said sidewall surface when the sleeve is in a relaxed state, less than fully pressed together, moving the button and sleeve relative to one another sufficiently to permit the sleeve to shrink to said undersize whereat its outer surface is small enough to permit the sleeve to enter the bore without interference and then pressing the button and internally tapered metal sleeve together in the cylindrical bore until the sleeve is elastically expanded by the button tightly between the button and the sidewall surface of the bore.
Claim 2
Independent Claim
215 words
A method of installing and holding an externally tapered button in a cylindrical bore in a drilling head by means of an internally tapered metal expansion sleeve, comprising; forming the sleeve with its outer surface oversized relative to the sidewall surface of the bore and with its inside surface generally the same shape as the tapered outer surface of the button and undersized relative thereto, axially pressing the sleeve and button together into a normal working relationship and, while in said relationship, shaping the outer surface of the sleeve to generally the same shape as the sidewall surface of the bore and to a size that is oversized relative to said sidewall surface while the sleeve and button are fully pressed together and that is undersized relative to said sidewall surface when the sleeve is in a relaxed state, less than fully pressed together, moving the button and sleeve relative to one another sufficiently to permit the sleeve to shrink to said undersize whereat its outer surface is small enough to permit the sleeve to enter the bore without interference and then pressing the button and internally tapered metal sleeve together in the cylindrical bore until the sleeve is elastically expanded by the button tightly between the button and the sidewall surface of the bore.
Claim 3
Dependent Claim
46 words
The method of claim 1, said cylindrical bore having an inner seat said internally tapered metal sleeve being annular and having a generally cylindrical outer surface, said step of pressing the button and sleeve together in the bore including abutting the button against said inner seat.
Claim 4
Dependent Claim
73 words
The method of claim 2, said seat including an inner end wall of the bore, the taper of said sleeve inner surface converging toward the end wall of the cylindrical bore and said step of pressing the button and sleeve together in the cylindrical bore including first pressing until the sleeve rests against The end wall of the bore and second pressing until the button rests against the end wall of the bore.
Claim 5
Dependent Claim
72 words
The method of claim 2, said seat including an end wall of the bore, said taper of said sleeve inner surface diverging toward the end wall of the cylindrical bore and said step of pressing the button and sleeve together in the cylindrical bore including first pressing until the button rest aggainst the end wall of the bore and second pressing until the sleeve rests against the end wall of the bore.
Claim 6
Dependent Claim
34 words
The method of claim 1 wherein said button and sleeve are in the same exact rotational alignment with each other during pressing in the bore as when pressed together into said normal working configuration.
Claim 7
Dependent Claim
49 words
The method of claim 1, said step of forming a sleeve with a tapered inner surface including cold forming the inner surface on a die, said step of reducing the diameter of the combined button and sleeve including grinding the exterior surface of the sleeve to the desired diameter.
Claim 8
Dependent Claim
49 words
The method of claim 5, said step of forming a sleeve with a tapered inner surface including cold forming the inner surface on a die, said step of reducing the diameter of the combined button and sleeve including grinding the exterior surface of the sleeve to the desired diameter.
Claim 9
Dependent Claim
63 words
The method of claim 7 wherein the taper of said inner surface converges toward the end wall of the cylindrical bore and said step of pressing the button and sleeve together in the cylindrical bore includes first pressing until the sleeve rests against the end wall of the bore and second pressing until the button rests against the end wall of the bore.
Claim 10
Dependent Claim
64 words
The method of claim 7 wherein said taper of said sleeve inner surface diverges toward the end wall of the cylindrical bore and said step of pressing the button and sleeve together in the cylindrical bore includes first pressing until the button rests against the end wall of the bore and second pressing until the sleeve rests against the end wall of the bore.
Claim 11
Independent Claim
201 words
A method of installing a button assembly having an externally tapered button and an internally tapered metal sleeve, in a cylindrical bore of a rock drillinghead assembly, said button assembly having an outer diameter slightly larger than the cylindrical bore, comprising; forming a hollow metal sleeve having a tapered inner surface and an outer surface, forming a solid button having a tapered outer surface of substantially the same shape as said sleeve tapered inner surface, a working end surface and an abutment end surface, elastically expanding the hollow sleeve outside of the bore to a normal working position and, while expanded, shaping the outside of the sleeve to a desired interference fit diameter greater than the bore diameter, relaxing the sleeve partially into an intermediate position to reduce the sleeve to a diameter less than the bore diameter, with the sleeve in said intermediate position, inserting said button and sleeve into said bore until the abutment end of the button engages the end of the bore, and moving the sleeve from said intermediate position into engagement with the end of the bore whereby the sleeve is expanded against the button and the bore to hold the button tightly within the bore.
Claim 12
Independent Claim
201 words
A method of installing a button assembly having an externally tapered button and an internally tapered metal sleeve, in a cylindrical bore of a rock drillinghead assembly, said button assembly having an outer diameter slightly larger than the cylindrical bore, comprising; forming a hollow metal sleeve having a tapered inner surface and an outer surface, forming a solid button having a tapered outer surface of substantially the same shape as said sleeve tapered inner surface, a working end surface and an abutment end surface, elastically expanding the hollow sleeve outside of the bore to a normal working position and, while expanded, shaping the outside of the sleeve to a desired interference fit diameter greater than the bore diameter, relaxing the sleeve partially into an intermediate position to reduce the sleeve to a diameter less than the bore diameter, with the sleeve in said intermediate position, inserting said button and sleeve into said bore until the abutment end of the button engages the end of the bore, and moving the sleeve from said intermediate position into engagement with the end of the bore whereby the sleeve is expanded against the button and the bore to hold the button tightly within the bore.
Claim 13
Independent Claim
147 words
A method of installing a button assembly having an externally tapered solid button and an internally tapered metal sleeve surrounding the button into a cylindrical bore of a drilling head assembly, said bore having side and end walls, comprising; forming the sleeve to a desired size and shape with the outside of the sleeve being of a first size smaller than the bore side wall, placing the formed internally tapered sleeve and the solid button in said bore, and moving the internally tapered sleeve and button further relative to each other with a force which does not exceed the elastic limit of the sleeve while simultaneously radially elastically expanding the sleeve from said first size to a second larger size in tight engagemenT with the bore sidewall so that the button is held tightly in the bore by the friction between the sleeve and the bore sidewall.
Claim 14
Independent Claim
147 words
A method of installing a button assembly having an externally tapered solid button and an internally tapered metal sleeve surrounding the button into a cylindrical bore of a drilling head assembly, said bore having side and end walls, comprising; forming the sleeve to a desired size and shape with the outside of the sleeve being of a first size smaller than the bore side wall, placing the formed internally tapered sleeve and the solid button in said bore, and moving the internally tapered sleeve and button further relative to each other with a force which does not exceed the elastic limit of the sleeve while simultaneously radially elastically expanding the sleeve from said first size to a second larger size in tight engagemenT with the bore sidewall so that the button is held tightly in the bore by the friction between the sleeve and the bore sidewall.
Claim 15
Dependent Claim
16 words
The method of claim 11, said sleeve having a hardness of at least 38'' 40 Rc.
Claim 16
Dependent Claim
25 words
The method of claim 11, said step of moving the sleeve including pressing the sleeve until it seats against the end wall of the bore.
Claim 17
Dependent Claim
111 words
The method of claim 11, said step of forming the sleeve including expanding the inside of the sleeve to match the size and shape of the button outer surface, and forming the outer surface of the sleeve while expanded fully over the button outside of the bore to a shape corresponding to the shape of the sidewall of the bore and to a size exceeding the size of the sidewall of the bore by the desired interference fit, said step of placing the formed sleeve and the button in the bore including relaxing the sleeve to reduce its outer size to less than the size of the sidewall of the bore.
Claim 18
Dependent Claim
49 words
The method of claim 14, said step of forming the outer surface of the sleeve while expanded outside of the bore including pressing the sleeve over the button into a working configuration, said step of relaxing the sleeve including withdrawing the sleeve along the button from its working configuration.
Claim 19
Dependent Claim
17 words
The method of claim 15, said bore outer surface converging toward the outer end of the bore.
Claim 20
Independent Claim
179 words
A method of installing an externally tapered button in a cylindrical bore of a drilling head, said bore having an inner end, a sidewall and an outer end, comprising; forming a sleeve with an inside taper smaller than the external taper of the button by a first predetermined amount and forming the sleeve with an outside diameter of a size which is smaller than the diameter of the sidewall of the bore by a second predetermined amount which is smaller than the said first predetermined amount, and axially moving the internally tapered sleeve and button relative to one another in the bore so as to elastically radially stretch the sleeve by the button against the sidewall of the bore to an extent greater than said second predetermined amount and by a force that does not exceed the elastic limit of the sleeve, thereby retaining the combined button and sleeve in the bore by the friction between the sleeve and the side wall of the bore caused by the elastic compressive load in the sleeve and sidewall of the bore.
Claim 21
Independent Claim
179 words
A method of installing an externally tapered button in a cylindrical bore of a drilling head, said bore having an inner end, a sidewall and an outer end, comprising; forming a sleeve with an inside taper smaller than the external taper of the button by a first predetermined amount and forming the sleeve with an outside diameter of a size which is smaller than the diameter of the sidewall of the bore by a second predetermined amount which is smaller than the said first predetermined amount, and axially moving the internally tapered sleeve and button relative to one another in the bore so as to elastically radially stretch the sleeve by the button against the sidewall of the bore to an extent greater than said second predetermined amount and by a force that does not exceed the elastic limit of the sleeve, thereby retaining the combined button and sleeve in the bore by the friction between the sleeve and the side wall of the bore caused by the elastic compressive load in the sleeve and sidewall of the bore.
Claim 22
Dependent Claim
20 words
The method of claim 17, said tapers of said button and sleeve converging toward the outer end of the bore.
Claim 23
Dependent Claim
20 words
The method of claim 17, said tapers of said button and sleeve diverging toward the outer end of the bore.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |