US3761192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chipless round hole cutter
Assignee: CARR ENGINEERING CORP
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Filing: 1971-12-22
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Granted: 1973-09-25
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Expires: 1991-12-22
Abstract
Abstract A chipless round hole cutter including a screw shear and die body which cooperate to provide a round hole in a sheet of metal. The die body has an opening equal to the desired opening to be cut in the metal and the die body fits over the screw portion of the screw shear. The screw shear includes a tapered helical threaded section which is used to cut the metal and to carry and guide the cut metal within the groove to be retained in the threaded groove within the die body. The cutting edge of the screw shear adjacent to the die body provides for the final cutting of the hole to the desired size. The screw shear may be tapered along its entire length and with various size die bodies used to provide for a plurality of different size openings with a single screw shear or the screw shear may include a straight threaded section having a diameter substantially equal to the opening through the die body.
Inventors
- 👤 K Carr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:56
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/0081; B23B2260/00; B23B2260/138; Y; Y10; Y10T; Y10T408/00; Y10T408/34; Y10T408/50; Y10T408/89; Y10T408/896; Y10T408/8967
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
201 words
A round hole cutter, including a die body formed with a central opening and having an inner diameter at a first end of the die body substantially equal to the hole to be cut, a screw shear, including a threaded portion having cutting edges and having a length greatEr than the length of the die body, a flange member providing a stop between the screw shear and the die body and with the threaded portion inserted into the die body to extend from the first end of the die body and with the outer configuration of the threaded portion of the screw shear contained within the die body and conforming to the inner configuration of the opening through the die body and with the threaded portion of the screw shear extending from the first end of the die body tapered inwardly, the combination of the screw shear and die body providing for a round hole to be cut through sheet material and with the cut material pulled upward and contained within the grooves between the threads to thereby bring all of the cut material to the outside to be stored in the grooves of the screw shear within the die body.
Claim 2
Dependent Claim
201 words
A round hole cutter, including a die body formed with a central opening and having an inner diameter at a first end of the die body substantially equal to the hole to be cut, a screw shear, including a threaded portion having cutting edges and having a length greatEr than the length of the die body, a flange member providing a stop between the screw shear and the die body and with the threaded portion inserted into the die body to extend from the first end of the die body and with the outer configuration of the threaded portion of the screw shear contained within the die body and conforming to the inner configuration of the opening through the die body and with the threaded portion of the screw shear extending from the first end of the die body tapered inwardly, the combination of the screw shear and die body providing for a round hole to be cut through sheet material and with the cut material pulled upward and contained within the grooves between the threads to thereby bring all of the cut material to the outside to be stored in the grooves of the screw shear within the die body.
Claim 3
Dependent Claim
34 words
The round hole cutter of claim 1 wherein the portion of the screw shear contained within the die body has a single diameter and the die body has an opening of a single diameter.
Claim 4
Dependent Claim
56 words
The round hole cutter of claim 1 wherein the screw shear is tapered from one end to the other and with the die body having a tapered opening corresponding to the taper of the screw shear and with a plurality of such die bodies of different lengths used to provide for cutting holes of different diameters.
Claim 5
Dependent Claim
178 words
A round hole cutter for cutting a round hole through sheet material and for insertion from a first side of the sheet material and with all of the cut material pulled to the first side, including a die body having an opening extending therethrough and with the inner diameter of the die body at one end substantially equal to the size of the hole to be cut in the sheet material, and a screw shear having a helical thread extending from a first end of the screw shear to a second end and with the screw shear having a length greater than the length of the opening through the die body to provide for a portion of the screw shear extending past the die body when the screw shear is inserted into the die body and with the portion of the screw shear extending past the die body tapered and with the portion of the screw shear maintained within the die body having an outer configuration conforming to the inner configuration of the opening through the die body.
Claim 6
Dependent Claim
178 words
A round hole cutter for cutting a round hole through sheet material and for insertion from a first side of the sheet material and with all of the cut material pulled to the first side, including a die body having an opening extending therethrough and with the inner diameter of the die body at one end substantially equal to the size of the hole to be cut in the sheet material, and a screw shear having a helical thread extending from a first end of the screw shear to a second end and with the screw shear having a length greater than the length of the opening through the die body to provide for a portion of the screw shear extending past the die body when the screw shear is inserted into the die body and with the portion of the screw shear extending past the die body tapered and with the portion of the screw shear maintained within the die body having an outer configuration conforming to the inner configuration of the opening through the die body.
Claim 7
Dependent Claim
36 words
The round hole cutter of claim 4 wherein the screw shear includes a section contained within the die body of a single diameter and wherein the opening through the die body is of a single diameter.
Claim 8
Dependent Claim
26 words
The round hole cutter of claim 5 wherein the helical thread is formed as a double helix to provide for balanced cutting of the sheet material.
Claim 9
Dependent Claim
37 words
The round hole cutter of claim 4 wherein the screw shear is tapered from one end to the other and the opening through the die body is tapered to conform to the taper of the screw shear.
References Cited (Backward Citations)
US3076356A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |