Patent US3704643A successfully refreshed from Google Patents.
US3704643A
Expired / Lapsed
US
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Flying shear
Assignee: Cookson Sheet Metal Developments Ltd
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Filing: 1970-11-20
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Granted: 1972-12-05
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Expires: 1990-11-20
Abstract
Abstract A flying shear suitable for cutting into predetermined lengths a moving supply of material for example metal sheet which may be a formed sheet passing from a roll forming machine. The flying shear comprises a shear blade assembly including shear blades between which the material can pass, means whereby the shear blade assembly is caused by the material to move forward with the material leaving a predetermined length of material in front of the blades, ram means to cause the blades to close together to cut the material, means responsive to the forward movement to cause the ram means to operate to effect the cut, means for opening the blades after the cut and means for retracting the blade assembly for another cut.
Inventors
- 👤 William Cookson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:12
CPC Classifications
B; B23; B23D; B23D25/00; B23D25/02; B23D25/04; B23D33/00; B23D33/02; Y; Y10; Y10T; Y10T83/00; Y10T83/465; Y10T83/4653; Y10T83/4656; Y10T83/4676; Y10T83/4679; Y10T83/4757; Y10T83/476
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
242 words
A shear for cutting into predetermined lengths a moving supply of material of the kind described, having a. a carriage movable in a forward and return movement along the line of travel of the material, b. cooperating shear blades on the carriage between which the material passes, c. means to close the blades to cut the material during the forward movement of the carriage and means to open the blades after the cut, d. a movable stop to be struck and driven forward along a path by a leading end of the material, e. a latch to restrain the carriage from forward movement, and means operated by the stop when struck by the material to release the latch, f. an inextensible linkage between the stop and the carriage whereby the stop, while being driven forward by the material, pulls the carriage in the forward movement, the carriage and the stop being spaced apart by a predetermined distance, said linkage including provision for a lost motion between the stop and the carriage immediately after the stop is struck by the material, g. driving means for the carriage to accelerate the carriage during the said lost motion, and h. a fixed cam surface adjacent the path of forward movement of the stop to be engaged by the said leading end of the material and to cause relative motion of the stop and the said leading end so that the material disengages from the stop.
Claim 2
Dependent Claim
242 words
A shear for cutting into predetermined lengths a moving supply of material of the kind described, having a. a carriage movable in a forward and return movement along the line of travel of the material, b. cooperating shear blades on the carriage between which the material passes, c. means to close the blades to cut the material during the forward movement of the carriage and means to open the blades after the cut, d. a movable stop to be struck and driven forward along a path by a leading end of the material, e. a latch to restrain the carriage from forward movement, and means operated by the stop when struck by the material to release the latch, f. an inextensible linkage between the stop and the carriage whereby the stop, while being driven forward by the material, pulls the carriage in the forward movement, the carriage and the stop being spaced apart by a predetermined distance, said linkage including provision for a lost motion between the stop and the carriage immediately after the stop is struck by the material, g. driving means for the carriage to accelerate the carriage during the said lost motion, and h. a fixed cam surface adjacent the path of forward movement of the stop to be engaged by the said leading end of the material and to cause relative motion of the stop and the said leading end so that the material disengages from the stop.
Claim 3
Dependent Claim
87 words
A shear according to claim 1 wherein the said inextensible linkage includes, in order to provide the said lost motion, a first member connected to the stop and a second member connected to the carriage, the said first and second members mutually engaging after a short relative movement of the first member past the second member on the stop being struck by the material to prevent any further such relative movement, whereby an inextensible connection between the stop and the carriage is provided after the lost motion.
Claim 4
Dependent Claim
41 words
A shear according to claim 2 wherein one of the said first and second members is biased by a spring against the other said member and the two said members have mutually opposed surfaces which engage after the said lost motion.
Claim 5
Dependent Claim
58 words
a shear according to claim 3 having stationary cam surfaces, the said biased member having cam follower surfaces which engage the said cam surfaces after a length of material has been cut, the said cam surfaces and said cam follower surfaces interacting to move said biased member against the bias to disengage the said first and second members.
Claim 6
Dependent Claim
101 words
A shear according to claim 1 wherein the latch comprises a stationary member and a member mounted on the carriage and movable relative to the carriage which engages the said stationary member to prevent the said forward movement of the carriage, the said movable member on the carriage having cam follower surfaces, there being a member connected to the stop having cam surfaces which engage said cam follower surfaces of the movable member whereby, when the stop is struck by the leading end of the material, the said movable member is moved so as to disengage from the said stationary member.
Claim 7
Dependent Claim
87 words
A shear according to claim 1 wherein the said fixed cam surface adjacent the path of forward movement of the stop is an upper surface of a fixed rod which upper surface slopes upwardly in the direction away from the carriage, the stop having a slot in which the rod is located, the said sloping upper surface rising above the path of movement of the stop, whereby the leading end of the material engages the said sloping portion and, travelling up it, is lifted off the stop.
Claim 8
Dependent Claim
49 words
A shear according to claim 1 having clamping means mounted on the carriage for clamping the material during cutting on the side of the blades further from the stop, the material remaining clamped until the leading end of the cut off length of material has disengaged from the Stop.
Claim 9
Dependent Claim
28 words
A shear according to claim 1 wherein said driving means for the carriage is at least one spring which is compressed by the return movement of the carriage.
Claim 10
Dependent Claim
34 words
A shear according to claim 8 wherein the clamping means include pressure pads and a platen mounted for movement with the shear-blade assembly and controlled to grip the material during and after a cut.
Claim 11
Dependent Claim
48 words
A shear according to claim 9 wherein the shear blades are suitable for cutting into predetermined lengths a moving supply of ribbed sheet material having planar elements between the ribs and wherein the pressure pads are arranged to engage the planar elements and clamp them to the platen.
Claim 12
Dependent Claim
28 words
A shear according to claim 1 wherein the said means to close the blades to cut the material comprises at least one hydraulic ram mounted on the carriage.
Claim 13
Dependent Claim
227 words
A flying shear suitable for cutting into predetermined lengths a moving supply of material of the kind described comprising a movable shear-blade assembly including shear blades between which the material can pass, ram means to cause the blades to close together to cut the material, means responsive to the forward movement of the material and shear-blade assembly to cause the ram means to operate so that the predetermined length of material is cut during the forward movement, means for opening the blades after the cut and means for retracting the blade assembly for another cut, means whereby the shear-blade assembly is caused by the material to move forward with the material leaving a predetermined length of material in front of the blades including a stop for the material in front of the shear blades, the stop being connectable through engagement means to the movable shear blade assembly so that when the stop and the movable mounting are connected the predetermined length of material lies between the stop and the blades, the said engagement means including a connecting element on which the stop is adjustably mounted, there being run-out means for the connecting element so that the stop can run out in advance of the movable shear blade assembly, the run out means including a run-out table for the material having a slot in which the stop moves.
Claim 14
Dependent Claim
227 words
A flying shear suitable for cutting into predetermined lengths a moving supply of material of the kind described comprising a movable shear-blade assembly including shear blades between which the material can pass, ram means to cause the blades to close together to cut the material, means responsive to the forward movement of the material and shear-blade assembly to cause the ram means to operate so that the predetermined length of material is cut during the forward movement, means for opening the blades after the cut and means for retracting the blade assembly for another cut, means whereby the shear-blade assembly is caused by the material to move forward with the material leaving a predetermined length of material in front of the blades including a stop for the material in front of the shear blades, the stop being connectable through engagement means to the movable shear blade assembly so that when the stop and the movable mounting are connected the predetermined length of material lies between the stop and the blades, the said engagement means including a connecting element on which the stop is adjustably mounted, there being run-out means for the connecting element so that the stop can run out in advance of the movable shear blade assembly, the run out means including a run-out table for the material having a slot in which the stop moves.
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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) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |