US3690220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helically-tracking milling assembly with tiltable thread cutting head
Assignee: Fresco Industries Inc
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Filing: 1970-04-29
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Granted: 1972-09-12
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Expires: 1990-04-29
Abstract
Abstract An assembly for positioning and operating a milling tool or thread-forming rotary cutter, either within or external to a workpiece such as a cylinder or tube, which positioning is of especial value when the workpiece itself is inconvenient to move or rotate due to size or shape. The cutting head can follow a helical path of selected pitch provided by interchangeable pairs of threadedly engaged guide cylinders carried by telescopic members, so as to transfer such thread pattern to the workpiece. By transversely extensible gear means (such as splined shaftbevel gear units or split gear trains) a transverse carriage which carries the cutting-positioning head can adjust the latter to different internal or external radii of the workpiece. In addition, by adjustable tilting of the positioning head, it can carry a rotary cutter of smaller diameter and hence greater cutting force; such head can be set at any angle within 360* rotation from the axis of the transverse carriage. Thus the rotary cutter can be set to the same inclination as the track of the thread being cut. The direction of rotary drive can be completely reversed, i.e., 180*. As one power source, the positioning assembly can be attached to a milling machine, or it can be operated independently thereof.
Inventors
- 👤 Francisco Escobedo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:09
CPC Classifications
B; B23; B23Q; B23Q5/00; B23Q5/02; B23Q5/04; B23Q5/043; B23Q5/046; B23C; B23C3/00; B23C3/28; B23C3/32; B23Q1/00; B23Q1/25; B23Q1/44; B23Q1/48; B23Q1/4804; B23Q1/4809; Y; Y10; Y10T; Y10T409/00; Y10T409/30; Y10T409/300056; Y10T409/30056; Y10T409/30448; Y10T409/30784; Y10T409/307952; Y10T409/308232; Y10T409/308456; Y10T74/00; Y10T74/19; Y10T74/19502
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
147 words
In combination with rotary drive means extending from a stationary housing to a rotatable housing and functionally projecting a rotary cutter from the rotatable housing, said housings being connected by extension means adapted to move the rotatable housing in a curved path relative to the stationary housing whereby the rotary cutter may cut curved threads on a workpiece, the improvement comprising a tiltable positioning head carried by the rotatable housing and characterized by a spindle adapted distally to project said rotary cutter, said positioning head also having lock means for anchoring the same at selected tilt positions relative to the rotatable housing, and extension gear means connecting the spindle of the positioning head with the rotary drive means of the rotatable housing, whereby the positioning head can be selectively located at different positions transverse to the axis of said rotary drive shaft and tilted from such positions.
Claim 2
Dependent Claim
147 words
In combination with rotary drive means extending from a stationary housing to a rotatable housing and functionally projecting a rotary cutter from the rotatable housing, said housings being connected by extension means adapted to move the rotatable housing in a curved path relative to the stationary housing whereby the rotary cutter may cut curved threads on a workpiece, the improvement comprising a tiltable positioning head carried by the rotatable housing and characterized by a spindle adapted distally to project said rotary cutter, said positioning head also having lock means for anchoring the same at selected tilt positions relative to the rotatable housing, and extension gear means connecting the spindle of the positioning head with the rotary drive means of the rotatable housing, whereby the positioning head can be selectively located at different positions transverse to the axis of said rotary drive shaft and tilted from such positions.
Claim 3
Dependent Claim
57 words
The combination of the preceding claim 1 wherein said extension gear means comprise a splined shaft transversely carried by the rotatable housing and axially disposed in a longitudinally ribbed bore of a bevel gear which is engaged by said rotary drive means, the distal end of said shaft drivingly engaging the spindle of the tiltable positioning head.
Claim 4
Dependent Claim
41 words
The combination of the preceding claim 1 wherein said extension means include interchangeable pairs of threadedly engaged guide cylinders, whereby the pitch of an engaged pair of guide cylinders may be duplicated by the threads being cut by the rotary cutter.
Claim 5
Dependent Claim
46 words
The combination of the preceding claim 1 wherein said rotatable housing carries ring gear means and a support axially extensible from the stationary housing carries worm gear means which engages said ring gear means, whereby manipulation of the worm gear means moves the rotatable housing spirally.
Claim 6
Dependent Claim
187 words
A milling assembly of the character described, comprising in combination: a stationary member and a rotatable member axially spaced apart by telescopic means connecting the two members for individual or joint, rotational and axial movement of the rotatable member, including means for mounting interchangeable pairs of mutually rotatably engaging, cylindrical guide sleeve means respectively supported by the stationary member and the rotatable member, and thus adapted by their relative rotation to determine the movement of the rotatable member relative to the stationary member and when threadedly engaged to cause a rotary cutter carried by the rotatable member to reproduce the pitch of such threads on a workpiece; a tiltable positioning head carried by the rotatable member and characterized by a spindle adapted distally to project said rotary cutter, said positioning head also having lock means for anchoring the same at selected tilt positions relative to the rotatable member, and lateral extension means connecting the spindle of the positioning head with the rotatable member, whereby the positioning head can be selectively located at different positions transverse to the axis of said rotatable member and tilted from such positions.
Claim 7
Dependent Claim
187 words
A milling assembly of the character described, comprising in combination: a stationary member and a rotatable member axially spaced apart by telescopic means connecting the two members for individual or joint, rotational and axial movement of the rotatable member, including means for mounting interchangeable pairs of mutually rotatably engaging, cylindrical guide sleeve means respectively supported by the stationary member and the rotatable member, and thus adapted by their relative rotation to determine the movement of the rotatable member relative to the stationary member and when threadedly engaged to cause a rotary cutter carried by the rotatable member to reproduce the pitch of such threads on a workpiece; a tiltable positioning head carried by the rotatable member and characterized by a spindle adapted distally to project said rotary cutter, said positioning head also having lock means for anchoring the same at selected tilt positions relative to the rotatable member, and lateral extension means connecting the spindle of the positioning head with the rotatable member, whereby the positioning head can be selectively located at different positions transverse to the axis of said rotatable member and tilted from such positions.
Claim 8
Dependent Claim
26 words
An assembly according to claim 5 wherein the axis of said rotary cutter is positionable substantially opposite to the direction of extension of said telescopic means.
Claim 9
Dependent Claim
25 words
An assembly according to claim 5 wherein the axis of said rotary cutter is positionable to conform to thE inclination of the thread being cut.
Claim 10
Dependent Claim
22 words
As assembly according to claim 5 wherein the axis of said rotary cutter is positionable substantially throughout a rotational adjustment of 360*.
References Cited (Backward Citations)
US2307222A
Cited
US2451497A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |