US3825362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arbor for an annular hole cutter
Assignee: HOUGEN EVERETT
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Filing: 1973-02-26
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Granted: 1974-07-23
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Expires: 1993-02-26
Abstract
Abstract A cup-shaped annular cutter for forming circular holes in workpieces mounted on the end of an arbor, the arbor being provided with a center pilot member adapted for ejecting the center slug resulting from the opening cut by the cutter. The arbor preferably has a sleeve mounted for axial sliding movement on the shank of the arbor with a transverse pin on the sleeve extending through a slot in the arbor for engaging the inner end of the pilot member.
Inventors
- 👤 E Hougen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:43
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/0006; B23B51/0007; B23B51/04; B23B51/044; B23B51/0453; B23B51/0466; B23B2260/00; B23B2260/136; Y; Y10; Y10T; Y10T408/00; Y10T408/50; Y10T408/51; Y10T408/89; Y10T408/895
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
320 words
An arbor for an annular hole cutter comprising, a shank having means on the rear end thereof for being secured to a rotary driving member and means on the forward end thereof for supporting a cup-shaped annular cutter having cutting teeth around the leading end of the cup side wall which, when the arbor is rotated and fed axially into a workpiece, are adapted to cut a circular groove through the workpiece and simultaneously form a round slug within the cup side wall, said shank having a central axial bore therein extending to the forward end of the shank, a pilot member axially slideable in said axial bore, means for shifting the pilot member axially forwardly in said bore so that the leading end thereof projects axially outwardly beyond the forward end of the shank, said means including a sleeve extending around and slideable axially on said shank, said shank having an axially extending slot therethrough, said slot terminating at its forward end at a point spaced axially inwardly of the forward end of the shank, a pin fixed in said sleeve and extending through said slot to limit the extent of axial forward movement of the sleeve relative to said shank, said sleeve, when shifted axially forwardly relative to the shank, causes said pin to abut the inner end of the pilot member to shift the same to said axially outwardly projected position, said sleeve having a smooth cylindrical outer surface adapted for sliding engagement within a guide bushing and having adjacent one end thereof a flange extending radially outwardly from said cylindrical surface whereby, when an annular cutter on the forward end of the arbor cuts an opening in a workpiece and produces a circular central slug which binds within the cup, said flange serves as an abutment for driving the sleeve forwardly relative to the shank and thereby causing the pilot member to forcibly eject said slug.
Claim 2
Dependent Claim
320 words
An arbor for an annular hole cutter comprising, a shank having means on the rear end thereof for being secured to a rotary driving member and means on the forward end thereof for supporting a cup-shaped annular cutter having cutting teeth around the leading end of the cup side wall which, when the arbor is rotated and fed axially into a workpiece, are adapted to cut a circular groove through the workpiece and simultaneously form a round slug within the cup side wall, said shank having a central axial bore therein extending to the forward end of the shank, a pilot member axially slideable in said axial bore, means for shifting the pilot member axially forwardly in said bore so that the leading end thereof projects axially outwardly beyond the forward end of the shank, said means including a sleeve extending around and slideable axially on said shank, said shank having an axially extending slot therethrough, said slot terminating at its forward end at a point spaced axially inwardly of the forward end of the shank, a pin fixed in said sleeve and extending through said slot to limit the extent of axial forward movement of the sleeve relative to said shank, said sleeve, when shifted axially forwardly relative to the shank, causes said pin to abut the inner end of the pilot member to shift the same to said axially outwardly projected position, said sleeve having a smooth cylindrical outer surface adapted for sliding engagement within a guide bushing and having adjacent one end thereof a flange extending radially outwardly from said cylindrical surface whereby, when an annular cutter on the forward end of the arbor cuts an opening in a workpiece and produces a circular central slug which binds within the cup, said flange serves as an abutment for driving the sleeve forwardly relative to the shank and thereby causing the pilot member to forcibly eject said slug.
Claim 3
Dependent Claim
55 words
An arbor as called for in claim 1 wherein said pin is fixed on said sleeve adjacent the axial mid-point thereof, said sleeve axially overlapping said slot at the opposite ends of its stroke on said shank and said cylindrical outer surface of said sleeve being accurately concentric with the longitudinal axis of said bore.
Claim 4
Dependent Claim
184 words
An arbor as called for in claim 1 including an annular cup-shaped cutter mounted on the forward end of the arbor, stop means in said bore adjacent the rear end thereof, a stop rod in said bore adapted, when the pilot member is retracted, to abut against the stop means at its rear end and against the inner end of the pilot member through said pin at its forward end to thereby limit retraction of the pilot member to a position wherein its leading end projects axially outwardly beyond the leading end of the cutter and means connecting the pilot member with the shank for rotation in unison, the leading end of the pilot member being shaped to produce a hole in a metal workpiece when the arbor is rotated and fed axIally toward the workpiece, said pilot member having a portion behind said leading end of greater diameter than said leading end, said portion of greater diameter being disposed in a plane axially outwardly of the leading end of the cutter when said pin is disposed at the forward end of said slot.
Claim 5
Dependent Claim
25 words
An arbor as called for in claim 3 wherein said stop means adjacent the rear end of said bore are adjustable axially within the bore.
Claim 6
Dependent Claim
35 words
An arbor as called for in claim 4 wherein the leading end of the pilot member comprises a drill point and said portion of larger diameter forms a radially enlarged shoulder behind the drill point.
Claim 7
Dependent Claim
96 words
An arbor as called for in claim 3 wherein the leading end of the pilot comprises an axially extending cylindrical portion connected with the shank of the pilot member by a radially outwardly extending shoulder, said cylindrical end portion being adapted to be inserted in a predrilled hole in the workpiece so that the cutter will cut a larger hole in the workpiece concentric with the predrilled hole, and means on said cylindrical end portion of the pilot member frictionally engageable with said slug for retaining the slug thereon after the cutter penetrates through the workpiece.
Claim 8
Dependent Claim
187 words
An arbor as called for in claim 1 including an annular cup-shaped cutter mounted on the forward end of the arbor and having cutting teeth extending circumferentially around the open end thereof, means forming a rotary driving connection between said shank and pilot member, the leading end of the pilot member being shaped to cut a hole in the workpiece when the shank is rotated with the pilot member in pressure engagement with the workpiece, a spring in said bore biasing said pilot member axially outwardly, means separate from said spring for resisting retraction of the pilot member within said bore beyond a predetermined position where the leading end of the pilot member projects axially beyond the teeth of the cutter so that the pilot member in said position cuts a hole in the workpiece when said shank is rotated while being subjected to axial pressure of at least a predetermined amount, said pilot member being radially enlarged at the portion thereof axially adjacent said leading end for exerting an axially outwardly directed force on the circular slug when the sleeve is driven forwardly on the shank.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |