Patent US3835688A successfully refreshed from Google Patents.
US3835688A
Expired / Lapsed
US
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Apparatus and method for sizing holes
Assignee: Huck Manufacturing Co
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Filing: 1973-01-17
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Granted: 1974-09-17
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Expires: 1993-01-17
Abstract
Abstract A method of sizing holes by enlarging holes through a workpieces with a mandrel and working through a seamless tubular member to enlarge the holes. The rebound of the tubular member upon enlargement is less than the material of the workpieces and is left in the holes to limit the rebound of the holes. Also disclosed is the joint produced by the above method. A device for sizing holes is disclosed which includes a mandrel with an expansion section which is forced through a seamless tubular member while held in the holes to enlarge both the tubular member and the holes. A backup member is provided with an aperture therethrough of a diameter smaller than the inside diameter of the tubular member and which is enlarged by the mandrel simultaneously with the enlargement of the sleeve member. By providing different outside diameters and a constant inside diameter on the seamless tubular member, the workpieces may be enlarged different amounts.
Inventors
- 👤 J King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:28
CPC Classifications
B; B23; B23P; B23P9/00; B23P9/02; B23P9/025; B21; B21J; B21J15/00; B21J15/02; B21J15/04; B21J15/043; F; F16; F16B; F16B19/00; F16B19/04; F16B19/08; F16B19/10; F16B19/1027; F16B19/1036; F16B19/1045; F16B19/1063; F16B4/00; F16B4/004; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49908; Y10T29/49938; Y10T29/4994
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
83 words
A method of sizing holes through workpieces comprising the steps of: forming pilot holes through the workpieces; placing a seamless tubular member within the pilot holes which rebounds less than the workpieces upon enlargement beyond the elastic limit of the material of the workpieces; and uniformly enlarging the tubular member throughout its length and the pilot holes through the tubular member with the tubular member serving to limit the amount of rebound of the resulting substantially constant diameter hole through the tubular member.
Claim 2
Independent Claim
83 words
A method of sizing holes through workpieces comprising the steps of: forming pilot holes through the workpieces; placing a seamless tubular member within the pilot holes which rebounds less than the workpieces upon enlargement beyond the elastic limit of the material of the workpieces; and uniformly enlarging the tubular member throughout its length and the pilot holes through the tubular member with the tubular member serving to limit the amount of rebound of the resulting substantially constant diameter hole through the tubular member.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein the step of enlarging includes passing a mandrel axially through the tubular member to uniformly enlarge the tubular member throughout its length.
Claim 4
Independent Claim
137 words
A method of sizing holes through workpieces comprising the steps of: forming pilot holes through the workpieces; placing a seamless tubular member within the pilot holes which rebounds less than the workpieces upon enlargement; enlarging the tubular member and the pilot holes through the tubular member by passing a mandrel through the tubular member with the tubular member serving to limit the amount of rebound of the resulting hole through the tubular member; and, supporting the tubular member in opposition to the movement of the mandrel with a backup member having aperture therethrough at least as small as the hole through the tubular member prior to enlargement, and wherein the step of enlarging further includes passing th mandrel through the aperture to enlarge same simultaneously with the enlargement of the tubular member immediately adjacent the backup member.
Claim 5
Independent Claim
137 words
A method of sizing holes through workpieces comprising the steps of: forming pilot holes through the workpieces; placing a seamless tubular member within the pilot holes which rebounds less than the workpieces upon enlargement; enlarging the tubular member and the pilot holes through the tubular member by passing a mandrel through the tubular member with the tubular member serving to limit the amount of rebound of the resulting hole through the tubular member; and, supporting the tubular member in opposition to the movement of the mandrel with a backup member having aperture therethrough at least as small as the hole through the tubular member prior to enlargement, and wherein the step of enlarging further includes passing th mandrel through the aperture to enlarge same simultaneously with the enlargement of the tubular member immediately adjacent the backup member.
Claim 6
Independent Claim
113 words
A method of enlarging a tubular member within holes through workpieces comprising the steps of: a. forcing a mandrel having an expansion section of a diameter larger than the inside diameter of the tubular member through the tubular member to enlarge same; and, b. supporting the end of the tubular member toward which the mandrel is moving with a back-up member having an aperture therethrough at least as small as the inside diameter of the tubular member prior to enlargement which is aligned with the inside of the tubular member and through which the expansion section passes to enlarge same simultaneously with the enlargement of the tubular member immediately adjacent the back-up member.
Claim 7
Independent Claim
113 words
A method of enlarging a tubular member within holes through workpieces comprising the steps of: a. forcing a mandrel having an expansion section of a diameter larger than the inside diameter of the tubular member through the tubular member to enlarge same; and, b. supporting the end of the tubular member toward which the mandrel is moving with a back-up member having an aperture therethrough at least as small as the inside diameter of the tubular member prior to enlargement which is aligned with the inside of the tubular member and through which the expansion section passes to enlarge same simultaneously with the enlargement of the tubular member immediately adjacent the back-up member.
Claim 8
Independent Claim
172 words
A device for sizing holes through workpieces including: a seamless tubular member having an outside diameter smaller than the initial diameter than the holes through the workpieces and defining a passage therethrough; a mandrel having an outside larger and an outside smaller diameter, said larger diameter larger than the inside diameter of said tubular member and said smaller diameter smaller than the inside diameter of said tubular member; and a backup member having an aperture therethrough at least as small as the inside diameter of said tubular member and larger than said smaller diameter of said mandrel so that when said smaLler diameter is inserted through said passage of said tubular member and said backup member positioned on said smaller diameter in opposition with said larger diameter across said tubular member, said larger diameter and said backup member can be forced toward each other to cause said larger diameter to pass through said passage and said aperture to enlarge the diameter of said tubular member and the holes through said tubular member.
Claim 9
Independent Claim
172 words
A device for sizing holes through workpieces including: a seamless tubular member having an outside diameter smaller than the initial diameter than the holes through the workpieces and defining a passage therethrough; a mandrel having an outside larger and an outside smaller diameter, said larger diameter larger than the inside diameter of said tubular member and said smaller diameter smaller than the inside diameter of said tubular member; and a backup member having an aperture therethrough at least as small as the inside diameter of said tubular member and larger than said smaller diameter of said mandrel so that when said smaLler diameter is inserted through said passage of said tubular member and said backup member positioned on said smaller diameter in opposition with said larger diameter across said tubular member, said larger diameter and said backup member can be forced toward each other to cause said larger diameter to pass through said passage and said aperture to enlarge the diameter of said tubular member and the holes through said tubular member.
Claim 10
Dependent Claim
42 words
The device of claim 5 wherein said tubular member has less rebound than the work pieces upon enlargement so that the tubular member limits the amount of rebound at the holes when said larger diameter has been forced through said tubular member.
Claim 11
Dependent Claim
44 words
The device of claim 5 wherein said backup member is washer shaped and defines a supporting surface for supporting said tubular member immediately adjacent said backup member to prevent said tubular member from being stripped from the holes as said mandrel is forced therethrough.
Claim 12
Dependent Claim
44 words
The device of claim 7 wherein said supporting surface is normal to said aperture and wherein said backup member further includes a supporting lip protruding from said supporting surface about said aperture and facing said tubular member, said lip having a concave outside surface.
Claim 13
Dependent Claim
36 words
The device of claim 7 wherein the hole through the workpieces is countersunk and wherein said tubular member includes a countersunk head flange at one end thereof adapted to fit within the countersink of the holes.
Claim 14
Dependent Claim
18 words
The device of claim 9 wherein said supporting surface is tapered to fit within said countersunk head flange.
Claim 15
Dependent Claim
22 words
The device of claim 5 wherein said aperture has a diameter a prescribed amount smaller than inside diameter of said tubular member.
Claim 16
Independent Claim
176 words
A device for sizing holes through workpieces including: a seamless tubular member having an outside diameter smaller than the initial diameter of the holes through the workpieces and defining a passage therethrough, said tubular member having less rebound upon enlargement than the material of the workpieces when the enlargement of said tubular member exceeds the elastic limit of the material of the workpieces; and, a mandrel having an outside larger diameter and an outside smaller diameter, said outside larger diameter larger than the inside diameter of said tubular member and said smaller diameter smaller than the inside diameter of said tubular member so that when said smaller diameter is inserted through said passage in said tubular member and said larger diameter is forced axially through said tubular member while said tubular member is held within the holes, said larger diameter will enlarge said tubular member uniformly throughout its length and enlarge the workpieces about the holes beyond the elastic limit of the workpieces, and said tubular member will limit the amount of rebound of the holes.
Claim 17
Independent Claim
176 words
A device for sizing holes through workpieces including: a seamless tubular member having an outside diameter smaller than the initial diameter of the holes through the workpieces and defining a passage therethrough, said tubular member having less rebound upon enlargement than the material of the workpieces when the enlargement of said tubular member exceeds the elastic limit of the material of the workpieces; and, a mandrel having an outside larger diameter and an outside smaller diameter, said outside larger diameter larger than the inside diameter of said tubular member and said smaller diameter smaller than the inside diameter of said tubular member so that when said smaller diameter is inserted through said passage in said tubular member and said larger diameter is forced axially through said tubular member while said tubular member is held within the holes, said larger diameter will enlarge said tubular member uniformly throughout its length and enlarge the workpieces about the holes beyond the elastic limit of the workpieces, and said tubular member will limit the amount of rebound of the holes.
Claim 18
Dependent Claim
140 words
A tool for enlarging holes through workpieces including: a tubular member receivable through said holes and having a tubular sidewall defining a central passage therethrough; a mandrel having an expansion section of a diameter a prescribed amount larger than the inside diameter of said tubular member; a backup member defining an aperture therethrough of a diameter at least as small as the inside diameter of said tubular member; and, drive means for forcing said expansion section of said mandrel through said tubular member to expand said sidewall and said holes while holding said tubular member within said holes and said backup member against said tubular member in opposition to said expansion section of said mandrel, said backup member being made out of a material that allows said expansion section of said mandrel to be forced therethrough to enlarge said aperture.
Claim 19
Dependent Claim
140 words
A tool for enlarging holes through workpieces including: a tubular member receivable through said holes and having a tubular sidewall defining a central passage therethrough; a mandrel having an expansion section of a diameter a prescribed amount larger than the inside diameter of said tubular member; a backup member defining an aperture therethrough of a diameter at least as small as the inside diameter of said tubular member; and, drive means for forcing said expansion section of said mandrel through said tubular member to expand said sidewall and said holes while holding said tubular member within said holes and said backup member against said tubular member in opposition to said expansion section of said mandrel, said backup member being made out of a material that allows said expansion section of said mandrel to be forced therethrough to enlarge said aperture.
Claim 20
Independent Claim
437 words
A device for use with a lockbolt installation tool to size holes through workpieces including: a tubular member including a seamless sidewall defining a passage therethrough and a head flange at one end of said sidewall, said sidewall defining a cylindricAl section adjacent said head flange, an inwardly tapered section joined with said cylindrical section opposite said head flange, and an inwardly directed lip joined to said tapered section opposite said cylindrical section, said seamless sidewall having less rebound than the material of the workpieces; an elongate mandrel comprising an expansion section at one end thereof; a central support section integral with said expansion section at one of its ends, and a gripping section integral with said support section opposite said expansion section; said support section having a diameter smaller than the initial smallest inside diameter of said sidewall so as to be slidably received therethrough, said expansion section including a cylindrical portion of a diameter larger than the largest inside diameter of said sidewall and a tapered portion connecting said cylindrical portion with said support section; and said gripping section adapted to be engaged by the lockbolt installation tool to pull said expansion section through said sidewall to enlarge same; a backup member having a washer shape and defining an aperture therethrough of a diameter larger than the diameter of said support section and smaller than the initial largest inside diameter of said sidewall slidably receivable over said support section; said backup member defining a working face adapted to engage and support said head flange and an opposite face normal to said aperture, said backup member being made of a material that is sufficiently weak in radial tension to allow said expansion section to be forced through said aperture to enlarge same but sufficiently strong in compression to prevent the collapse thereof; and, an adapter constructed and arranged to be removably mounted on the operating end of the lockbolt installation tool and defining a central passage therethrough of a diameter sufficiently large to slidably receive said cylindrical portion of said mandrel therethrough, so that when said support section is inserted through said sidewall and said backup member placed on said support section with said working face facing head flange in opposition to said expansion section, said lockbolt installation tool can engage said gripping section after passage through said adapter to pull said expansion section through said wall while forcing said backup member toward the workpieces to enlarge said tubular member, the holes through the workpieces and said aperture through said backup member and said tubular member will limit the rebound of the holes through the workpieces.
Claim 21
Independent Claim
437 words
A device for use with a lockbolt installation tool to size holes through workpieces including: a tubular member including a seamless sidewall defining a passage therethrough and a head flange at one end of said sidewall, said sidewall defining a cylindricAl section adjacent said head flange, an inwardly tapered section joined with said cylindrical section opposite said head flange, and an inwardly directed lip joined to said tapered section opposite said cylindrical section, said seamless sidewall having less rebound than the material of the workpieces; an elongate mandrel comprising an expansion section at one end thereof; a central support section integral with said expansion section at one of its ends, and a gripping section integral with said support section opposite said expansion section; said support section having a diameter smaller than the initial smallest inside diameter of said sidewall so as to be slidably received therethrough, said expansion section including a cylindrical portion of a diameter larger than the largest inside diameter of said sidewall and a tapered portion connecting said cylindrical portion with said support section; and said gripping section adapted to be engaged by the lockbolt installation tool to pull said expansion section through said sidewall to enlarge same; a backup member having a washer shape and defining an aperture therethrough of a diameter larger than the diameter of said support section and smaller than the initial largest inside diameter of said sidewall slidably receivable over said support section; said backup member defining a working face adapted to engage and support said head flange and an opposite face normal to said aperture, said backup member being made of a material that is sufficiently weak in radial tension to allow said expansion section to be forced through said aperture to enlarge same but sufficiently strong in compression to prevent the collapse thereof; and, an adapter constructed and arranged to be removably mounted on the operating end of the lockbolt installation tool and defining a central passage therethrough of a diameter sufficiently large to slidably receive said cylindrical portion of said mandrel therethrough, so that when said support section is inserted through said sidewall and said backup member placed on said support section with said working face facing head flange in opposition to said expansion section, said lockbolt installation tool can engage said gripping section after passage through said adapter to pull said expansion section through said wall while forcing said backup member toward the workpieces to enlarge said tubular member, the holes through the workpieces and said aperture through said backup member and said tubular member will limit the rebound of the holes through the workpieces.
Claim 22
Dependent Claim
99 words
The device of claim 5 wherein said tubular member includes a seamless cylindrical sidewall comprising a major expansion section and a minor expansion section positioned end-to-end with said major section, said passage being a common passage through both said major section and said minor section with a substantially constant diameter along its length, said minor section having a minor outside diameter a prescribed amount larger than that of said passage, and said major section having a major outside diameter a prescribed amount larger than said minor outside diameter but at least as small as said holes in said workpieces.
Claim 23
Dependent Claim
94 words
The device of claim 15 wherein said major expansion section is positionable on one of said workpieces and has a length corresponding to the thickness of said one of said workpieces and wherein said minor expansion section is positionable in another of said workpieces when said major section is positioned in one of said workpieces and has a length corresponding to the thickness of said another of said workpieces to enlarge the holes through said workpieces different amounts when said larger diameter of said mandrel is forced through said passage in said tubular member.
Claim 24
Dependent Claim
99 words
The device of claim 12 wherein said tubular member includes a seamless cylindrical sidewall comprising a major expansion section and a minor expansion section positioned end-to-end with said major section, said passage being a common pAssage through both said major section and said minor section with a substantially constant diameter along its length, said minor section having a minor outside diameter a prescribed amount larger than that of said passage, and said major section having a major outside diameter a prescribed amount larger than said minor outside diameter but at least as small as said holes in said workpieces.
Claim 25
Dependent Claim
94 words
The device of claim 17 wherein said major expansion section is positionable in one of said workpieces and has a length corresponding to the thickness of said one of said workpieces and wherein said minor expansion section is positionable in another of said workpieces when said major section is positioned in one of said workpieces and has a length corresponding to the thickness of said another of said workpieces to enlarge the holes through said workpieces different amounts when said larger diameter of said mandrel is forced through said passage in said tubular member.
Claim 26
Dependent Claim
133 words
The method of claim 1 wherein said tubular member includes a seamless sidewall having a major expansion section and a minor expansion section positioned end-to-end with said major expansion section, said major section having an outside diameter a prescribed amount larger than the outside diameter of said minor section, and said major and minor sections defining a common passage therethrough of a prescribed diameter; wherein the step of placing said tubular member in said pilot holes includes positioning said major section within that workpiece to be enlarged the greater amount and said minor section within that workpiece to be enlarged the lesser amount; and, wherein the step of enlarging the tubular member includes enlarging said passage a substantially constant amount along its length to enlarge the pilot holes through the workpieces different amounts.
Claim 27
Dependent Claim
46 words
The method of claim 1 further including the step of leaving the enlarged tubular member within the holes during subsequent use so that the tubular member continues to limit the amount of rebound of the material of the workpieces about the holes during such subsequent use.
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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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |