Patent US3722957A successfully refreshed from Google Patents.
US3722957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gage scraper
Assignee: Atlas Copco Jarva Inc
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Filing: 1971-04-05
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Granted: 1973-03-27
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Expires: 1991-04-05
Abstract
Abstract A tunneling machine includes a support frame, a rotatable cutter head, and inside roller cutters and gage roller cutters for cutting or crushing the end face of a tunnel. Each gage cutter has a gage scraper with a scraper blade engaging the tunnel surface for clearing materials from the path of the gage cutter. A spring biases the scraper blade toward the tunnel surface, and the scraper blade is pivotally mounted with respect to the cutter head for movement toward and away from the tunnel surface along an arcuate path. A bolt head in the arcuate path provides an adjustable stop for preventing excessive outward travel of the scraper blade when a void is encountered in the tunnel surface. The bolt also provides a release means to displace the scraper blade away from the tunnel surface to permit removal of the scraper blade.
Inventors
- 👤 L Snyder
- 👤 J Matlack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:33
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/10; E21D9/1006; E21D9/104
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
237 words
In a cutter head for a tunnelling machine having a plurality of roller type cutters including at least one gage cutter mounted on the cutter head, said cutter head being constructed and arranged to bore a tunnel by rotational movement of the cutter head about a tunnel surface including an end face and a side wall with said gage cutter engaging said tunnel surface at a zone adjaceNt the intersection of said end face and said side wall, and a gage scraper mounted on said cutter head on the leading side of said gage cutter adjacent said end face and said wall, the improvement in said gage scraper comprising a mounting means secured to said cutter head, a movable mounting plate movably secured to said cutter head by said mounting means for movement along a path to and from said tunnel surface, a detachable blade member, means for detachably securing said blade member to said mounting plate for movement with said mounting plate to and from said tunnel surface, resilient means acting against said mounting plate for biasing said mounting plate and said blade member toward said tunnel surface, and release means fixedly secured to said cutter head for positively pulling said mounting plate toward said cutter head against the bias of said resilient means to move said blade member away from said tunnel surface whereby said detachable blade member may be detached from said support plate.
Claim 2
Dependent Claim
237 words
In a cutter head for a tunnelling machine having a plurality of roller type cutters including at least one gage cutter mounted on the cutter head, said cutter head being constructed and arranged to bore a tunnel by rotational movement of the cutter head about a tunnel surface including an end face and a side wall with said gage cutter engaging said tunnel surface at a zone adjaceNt the intersection of said end face and said side wall, and a gage scraper mounted on said cutter head on the leading side of said gage cutter adjacent said end face and said wall, the improvement in said gage scraper comprising a mounting means secured to said cutter head, a movable mounting plate movably secured to said cutter head by said mounting means for movement along a path to and from said tunnel surface, a detachable blade member, means for detachably securing said blade member to said mounting plate for movement with said mounting plate to and from said tunnel surface, resilient means acting against said mounting plate for biasing said mounting plate and said blade member toward said tunnel surface, and release means fixedly secured to said cutter head for positively pulling said mounting plate toward said cutter head against the bias of said resilient means to move said blade member away from said tunnel surface whereby said detachable blade member may be detached from said support plate.
Claim 3
Dependent Claim
56 words
A cutter head as set forth in claim 1 wherein said release means includes a force receiving portion disposed on said mounting plate, a force multiplying means for increasing the force applied to said force receiving portion, and a force applying portion for engaging said mounting plate and applying said multiplied force to said mounting plate.
Claim 4
Dependent Claim
59 words
A cutter head as set forth in claim 1 wherein said resilient means includes a coil spring, said release means includes a threaded rod extending through said coil spring between said mounting plate and said cutter head, and said threaded rod is slidably disposed in a passage in said mounting plate and is fixedly disposed on said cutter head.
Claim 5
Dependent Claim
67 words
A cutter head as set forth in claim 1 wherein said blade member is disposed in a plane, said mounting means includes hinge means spaced from said plane for mounting said mounting plate whereby said path is an arcuate path, said hinge means includes a pivotal axis, and said pivotal axis extends in a direction substantially perpendicular to the rotational direction of travel of said cutter head.
Claim 6
Dependent Claim
45 words
A cutter head as set forth in claim 1 wherein said release means includes a stop member disposed in said path of said mounting plate for limiting travel of said mounting plate and said blade member away from said cutter head toward said tunnel surface.
Claim 7
Dependent Claim
51 words
A cutter head as set forth in claim 5 wherein said stop member is spaced away from said mounting plate, and said stop member includes surface means for engaging said mounting plate and for defining the outermost portion of said mounting plate away from said cutter head toward said tunnel face.
Claim 8
Dependent Claim
22 words
A cutter head as set forth in claim 6 including means for adjustably positioning said stop member for varying said outermost position.
Claim 9
Dependent Claim
49 words
A cutter head as set forth in claim 5 wherein said stop member is normally disposed in said path of movement of said mounting plate between an advanced position and said tunnel surface for limiting said movement of said mounting plate from said advanced position toward said tunnel surface.
Claim 10
Dependent Claim
133 words
A tunnelling machine comprising a rotatable cutter head, a roller cutter mounted on said cutter head for engaging an end face of a tunnel with rolling contact, a scraper leading said roller cutter for clearing materials from the path of said roller cutter, said scraper including a movable portion and a mounting means, means for biasing said movable portion toward an advanced position adjacent a tunnel surface, said movable portion including a blade portion disposed in a plane, said mounting means including pivot means spaced from said plane for defining an arcuate path of travel of said movable portion toward and away from said tunnel surface, said pivot means including a pivotal axis, and said pivotal axis extending in a direction substantially perpendicular to the rotational direction of travel of said cutter head.
Claim 11
Dependent Claim
133 words
A tunnelling machine comprising a rotatable cutter head, a roller cutter mounted on said cutter head for engaging an end face of a tunnel with rolling contact, a scraper leading said roller cutter for clearing materials from the path of said roller cutter, said scraper including a movable portion and a mounting means, means for biasing said movable portion toward an advanced position adjacent a tunnel surface, said movable portion including a blade portion disposed in a plane, said mounting means including pivot means spaced from said plane for defining an arcuate path of travel of said movable portion toward and away from said tunnel surface, said pivot means including a pivotal axis, and said pivotal axis extending in a direction substantially perpendicular to the rotational direction of travel of said cutter head.
Claim 12
Dependent Claim
57 words
A tunnelling machine as set forth in claim 9 wherein said movable portion includeS a mounting portion, said blade portion is detachably secured to said mounting portion, and release means moves said movable portion along said arcuate path away from said tunnel surface against the bias of said biasing means to permit removal of said blade portion.
Claim 13
Dependent Claim
34 words
A tunnelling machine as set forth in claim 9 including stop means for preventing movement of said movable portion along said arcuate path away from said cutter head beyond a predetermined maximum outward position.
Claim 14
Dependent Claim
24 words
A tunnelling machine as set forth in claim 9 wherein said pivotal axis is disposed in a plane substantially perpendicular to said tunnel surface.
Claim 15
Dependent Claim
23 words
A tunnelling machine as set forth in claim 9 wherein said pivotal axis is substantially parallel to said plane of said blade portion.
References Cited (Backward Citations)
US3583503A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |