Patent US3778178A successfully refreshed from Google Patents.
US3778178A
Expired / Lapsed
US
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Apparatus for controlling blade positioning in a cutter head assembly
Assignee: Gleason Works
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Filing: 1972-07-31
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Granted: 1973-12-11
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Expires: 1992-07-31
Abstract
Abstract Apparatus for controlling operative positioning of individual blades in a cutter head assembly of a type which may be used for cutting ''''blind'''' arcuate slots in a workpiece, such as the seal slots required for rotors of rotary, combustion engines. A plurality of blade-holding structures, and their associated blades, is positioned about a circumference of the cutter head. Each blade-holding structure is mounted so as to be independently movable axially relative to the cutter head to thereby provide for successive and progressive engagement and disengagement of individual blades with the workpiece as the cutter head rotates during a cutting operation. A portion of each blade-holding means is carried within a fluid chamber which communicates with a fluid pressure system so as to normally urge each blade-holding structure toward its cutting position. In addition, a stop limit means is contained in the fluid chamber to limit the movement of each blade-holding means in a cutting direction. Each stop limit means is arranged to create a dash pot effect with fluid contained in the chamber during final increments of movement of the blade-holding means to its extended limit position. This arrangement reduces shock and vibration in the cutter head assembly and minimizes noise during operation of the assembly. Also, the dash pot effect eliminates any tendency for the bladeholding structure to bounce as it moves very rapidly to its limit position for cutting a slot.
Inventors
- 👤 E Hunkeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:57
CPC Classifications
B; B23; B23D; B23D5/00; B23D5/02; Y; Y10; Y10T; Y10T408/00; Y10T408/39; Y10T409/00; Y10T409/50; Y10T409/502624; Y10T409/502788; Y10T409/5041; Y10T409/504264
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
254 words
Apparatus for use with a machine which includes a cutter head means for carrying a plurality of blade means in spaced positions about a circumference of the cutter head means so that individual blade means can be brought into successive and progressive engagement with a workpiece to form a blind slot in the workpiece, said apparatus being characterized by a separate blade-holding means for holding each blade means of said plurality of blade means, and each blade-holding means being mounted in said cutter head so as to be independently movable relative to said workpiece along an axis which moves an associated blade means into and out of cutting engagement with the workpiece during operation of the machine, fluid pressure means for urging each blade-holding means in a cutting direction so as to move an associated blade means into cutting engagement with said workpiece in accordance with a sequence of operation for the machine, said fluid pressure means including means defining a fluid chamber which communicates with a portion of a blade-holding means to apply a pressure on said portion to thereby urge the blade-holding means in said cutting direction, and stop limit means contained in said fluid chamber for stopping movement of each of said blade holding means at a limit position in said cutting direction, said stop limit means and said portion of each blade-holding means being arranged to create a dash pot effect with fluid contained in said chamber during final increments of movement of the blade-holding means to said limit position.
Claim 2
Dependent Claim
254 words
Apparatus for use with a machine which includes a cutter head means for carrying a plurality of blade means in spaced positions about a circumference of the cutter head means so that individual blade means can be brought into successive and progressive engagement with a workpiece to form a blind slot in the workpiece, said apparatus being characterized by a separate blade-holding means for holding each blade means of said plurality of blade means, and each blade-holding means being mounted in said cutter head so as to be independently movable relative to said workpiece along an axis which moves an associated blade means into and out of cutting engagement with the workpiece during operation of the machine, fluid pressure means for urging each blade-holding means in a cutting direction so as to move an associated blade means into cutting engagement with said workpiece in accordance with a sequence of operation for the machine, said fluid pressure means including means defining a fluid chamber which communicates with a portion of a blade-holding means to apply a pressure on said portion to thereby urge the blade-holding means in said cutting direction, and stop limit means contained in said fluid chamber for stopping movement of each of said blade holding means at a limit position in said cutting direction, said stop limit means and said portion of each blade-holding means being arranged to create a dash pot effect with fluid contained in said chamber during final increments of movement of the blade-holding means to said limit position.
Claim 3
Dependent Claim
54 words
Apparatus according to claim 1 wherein said portion of said blade-holding means comprises a terminal end portion of the blade-holding means, said terminal end portion being received into said fluid chamber for limited movement along its axis within the fluid chamber, and said fluid chamber being formed within assemblies associated with said cutter head.
Claim 4
Dependent Claim
21 words
Apparatus according to claim 2 wherein said terminal end portion includes an enlarged head element for contacting said stop limit means.
Claim 5
Dependent Claim
21 words
Apparatus according to claim 3 wherein said stop limit means includes a bore therethrough for passage of said terminal end portion.
Claim 6
Dependent Claim
35 words
Apparatus according to claim 1 wherein said fluid chamber intersects a central longitudinal axis of said blade-holding means to thereby minimize deflection of the blade-holding means when a force of fluid pressure is applied thereto.
Claim 7
Dependent Claim
42 words
Apparatus according to claim 1 and including: cam means carried by said machine for engaging each of said blade-holding means to move an associated blade means out of engagement with a workpiece in accordance with said sequence of operation for the machine.
Claim 8
Dependent Claim
55 words
Apparatus according to claim 6 and including: cam follower means carried by each of said blade-holding means for engaging said cam means, said cam follower means being positioned near a central longitudinal axis of the blade-holding means to minimize deflection of the blade-holding means during engagement of the cam follower means with said cam means.
Claim 9
Dependent Claim
26 words
Apparatus according to claim 1 wherein said blade means are arranged in equally spaced positions about a circumference defined on a face of the cutter head.
Claim 10
Dependent Claim
60 words
Apparatus according to claim 1 wherein each of said blade-holding means comprises an elongated member having means for carryIng a blade means at one end thereof, and including bearing means for mounting said elongated member in said cutter head for movement along its central longitudinal axis into and out of cutting engagement with a workpiece during operation of the machine.
Claim 11
Dependent Claim
22 words
Apparatus according to claim 9 and including means for radially adjusting the positions of said blade-holding means relative to said cutter head.
Claim 12
Dependent Claim
35 words
Apparatus according to claim 1 wherein said fluid chamber comprises a single annular chamber formed in said cutter head means so as to communicate with all of the blade-holding means mounted in the cutter head.
Claim 13
Dependent Claim
33 words
Apparatus according to claim 11 wherein said fluid chamber is connected to a source of hydraulic fluid for filling the chamber and for maintaining a positive pressure against all of said blade-holding means.
References Cited (Backward Citations)
DE1269455B
Cited
US3143923A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |