US3859690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doctor blade assembly
Assignee: James Ross Ltd
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Filing: 1972-10-02
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Granted: 1975-01-14
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Expires: 1992-10-02
Abstract
Abstract A heavy duty doctor apparatus effective for creping for use with a roll, for example, a Yankee cylinder. The apparatus features a doctor pressure plate assembly which has a pressure plate adapted to extend the width of the cylinder carried by an array of spaced apart pressure fingers. Each finger has a transverse fulcrum and pairs of jaws provided with opposed surfaces defining between them a registering receiving slot extending from a root to a mouth. The pressure plate is mounted on one of the opposed surfaces, preferably with a pressure pad intervening the pressure plate and surface. The pressure plate projects beyond its mounting surface. The slot also accommodates a blade seat which rests on the other opposed surface and has an abutment adapted to engage the trailing edge of the blade seat which is sandwiched between the pressure plate and blade seat. Each slot is stepped inwards at its root to provide a retaining groove for the blade seat. A preferred finger is of integral solid metal construction. A preferred form of blade seat is an elongated plate of nonmetallic heat-resistant material having one surface for resting on the fingers and the opposite surface for receiving the blade and having a protruding bar for engaging the trailing edge of the doctor blade.
Inventors
- 👤 Jack Frederick Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:06
CPC Classifications
D; D21; D21G; D21G3/00; D21G3/005
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
131 words
A doctor blade pressure plate assembly, comprising, an array of spaced apart pressure fingers connected to a pressure plate in parallel relationship, each of the fingers having a one-piece body including a central part provided with a generally centered fulcrum for individual pivotal mounting of the finger, a tongue extending from one side of said central part perpendicularly to the axis of the fulcrum for receiving doctoring pressure, a pair of jaws extending directly from the opposite side of said central part and defining first and second spaced apart opposed surfaces on the side of the fulcrum opposite to said tongue, said spaced surfaces forming therebetween a doctor blade holding space immediately adjacent said central part, the pressure plate being permanently secured to the first surfaces and joining said pressure fingers.
Claim 2
Dependent Claim
131 words
A doctor blade pressure plate assembly, comprising, an array of spaced apart pressure fingers connected to a pressure plate in parallel relationship, each of the fingers having a one-piece body including a central part provided with a generally centered fulcrum for individual pivotal mounting of the finger, a tongue extending from one side of said central part perpendicularly to the axis of the fulcrum for receiving doctoring pressure, a pair of jaws extending directly from the opposite side of said central part and defining first and second spaced apart opposed surfaces on the side of the fulcrum opposite to said tongue, said spaced surfaces forming therebetween a doctor blade holding space immediately adjacent said central part, the pressure plate being permanently secured to the first surfaces and joining said pressure fingers.
Claim 3
Dependent Claim
44 words
A doctor blade pressure plate assembly, as defined in claim 1, in which there is a blade seat extending the width of the assembly and detachably mounted on the second surfaces and provided with an abutment for the trailing edge of a doctor blade.
Claim 4
Dependent Claim
192 words
A doctor blade pressure plate assembly to hold a doctor blade against a cylinder to be doctored, comprising a pressure plate adapted to extend the width of a cylinder and having a straight terminal edge, connected to the pressure plate an array of spaced apart pressure fingers, each pressure finger having a bearing and extending in one direction from the bearing a pair of jaws provided with opposed first and second opposed surfaces defining therebetween a receiving slot, the pressure plate being held to the first surfaces of the fingers and projecting therebeyond to its terminal straight edge, said slot being for a major portion of its length of a width to accommodate a blade seat resting on said second face and extending the width of the cylinder and the pressure plate on the first face with a doctor blade in between, each slot being stepped inwards at its inner end to proviDe a narrower retaining slot for receiving the blade seat, each finger being provided with a tongue extending from the bearing in a direction opposite to that of the jaws and having a surface for contact with resilient pressure means.
Claim 5
Dependent Claim
192 words
A doctor blade pressure plate assembly to hold a doctor blade against a cylinder to be doctored, comprising a pressure plate adapted to extend the width of a cylinder and having a straight terminal edge, connected to the pressure plate an array of spaced apart pressure fingers, each pressure finger having a bearing and extending in one direction from the bearing a pair of jaws provided with opposed first and second opposed surfaces defining therebetween a receiving slot, the pressure plate being held to the first surfaces of the fingers and projecting therebeyond to its terminal straight edge, said slot being for a major portion of its length of a width to accommodate a blade seat resting on said second face and extending the width of the cylinder and the pressure plate on the first face with a doctor blade in between, each slot being stepped inwards at its inner end to proviDe a narrower retaining slot for receiving the blade seat, each finger being provided with a tongue extending from the bearing in a direction opposite to that of the jaws and having a surface for contact with resilient pressure means.
Claim 6
Dependent Claim
57 words
A doctor pressure plate assembly, as defined in claim 3, in which there is a pressure pad intervening each finger and the pressure plate, each pressure pad being mounted on the first surface of the finger and projecting therebeyond to a terminal straight edge, the pressure plate extending beyond the pressure pads to a terminal straight edge.
Claim 7
Dependent Claim
110 words
A doctor blade pressure plate assembly, comprising, an array of spaced apart pressure fingers, each pressure finger having a transverse mounting aperture and having pairs of jaws provided with opposed faces defining therebetween a registering receiving slot extending from a root to a mouth, extending continuously the entire width of the array a pressure plate connected to one of said faces of each finger, said slot being of a width for a major part of its length to accommodate a blade seat, doctor blade, pressure plate and pad, said slot being stepped inwards at its root to provide a retaining groove for a blade seat resting on the opposite surface.
Claim 8
Dependent Claim
110 words
A doctor blade pressure plate assembly, comprising, an array of spaced apart pressure fingers, each pressure finger having a transverse mounting aperture and having pairs of jaws provided with opposed faces defining therebetween a registering receiving slot extending from a root to a mouth, extending continuously the entire width of the array a pressure plate connected to one of said faces of each finger, said slot being of a width for a major part of its length to accommodate a blade seat, doctor blade, pressure plate and pad, said slot being stepped inwards at its root to provide a retaining groove for a blade seat resting on the opposite surface.
Claim 9
Dependent Claim
46 words
A doctor blade pressure plate assembly, as defined in claim 5, in which there is mounted on one face of each finger intervening it and the pressure plate a pressure pad which has a straight edge which stops short of the edge of the pressure plate.
Claim 10
Dependent Claim
27 words
A doctor pressure plate assembly, as defined in claim 6, in which the fingers and pads are attached to the plate by rivets extending through the fingers.
Claim 11
Dependent Claim
31 words
A doctor pressure plate assembly, as defined in claim 5, in which a protective apron is connected to the ends of the pressure fingers and is draped inwardly over said fingers.
Claim 12
Dependent Claim
38 words
A doctor pressure plate assembly, as defined in claim 8, in which said apron is mounted on the end of a jaw of the finger by a clip conforming to the surface of the jaw and bolted thereto.
Claim 13
Dependent Claim
166 words
A pressure finger for a doctor blade pressure plate assembly, comprising, a body having a hub part provided with a transverse fulcrum to receive pivotal mounting means, first and second jaws extending from the bearing part perpendicularly to the axis of the fulcrum and having first and second spaced apart opposed surfaces defining therebetween a mounting slot for accommodating the pressure plate on the first surface a blade seat on the second surface and the blade sandwiched between, an inner terminal part of the first surface being stepped inwards towards the second to provide a terminal portion of the slot of reduced width constituting a retaining groove for mating with a margin of a blade seat resting on the second surface, a tongue extending from the bearing part in a direction opposite to that of the jaws and having a bearing surface facing the same direction as said first surface for contact by pressure means acting to urge the finger about the bearing in doctoring direction.
Claim 14
Dependent Claim
166 words
A pressure finger for a doctor blade pressure plate assembly, comprising, a body having a hub part provided with a transverse fulcrum to receive pivotal mounting means, first and second jaws extending from the bearing part perpendicularly to the axis of the fulcrum and having first and second spaced apart opposed surfaces defining therebetween a mounting slot for accommodating the pressure plate on the first surface a blade seat on the second surface and the blade sandwiched between, an inner terminal part of the first surface being stepped inwards towards the second to provide a terminal portion of the slot of reduced width constituting a retaining groove for mating with a margin of a blade seat resting on the second surface, a tongue extending from the bearing part in a direction opposite to that of the jaws and having a bearing surface facing the same direction as said first surface for contact by pressure means acting to urge the finger about the bearing in doctoring direction.
Claim 15
Dependent Claim
26 words
A pressure finger, as defined in claim 10, in which said first jaw has a beak protruding beyond said second jaw for mounting the pressure plate.
Claim 16
Dependent Claim
40 words
A pressure finger, as defined in claim 10, in which the bearing surface of the tongue is substantially in alignment with the first surface and the bearing part has a shoulder substantially perpendicular to the bearing surface of the tongue.
Claim 17
Dependent Claim
17 words
A pressure finger, as defined in claim 10, in which the body is an integral solid structure.
Claim 18
Dependent Claim
115 words
A blade seat for supporting a blade on a doctor blade assembly having a plurality of spaced apart pressure fingers, comprising: a thin elongated rectangular body having opposed first and second surfaces, and longitudinal opposed parallel edges, abutment means extending upwardly from the first surface parallel to and spaced unequally from the respective edges, the first surface between said respeCtive edges and the abutment means providing seatings to receive a doctor blade with its trailing edge against said abutment means, the second surface being shaped to rest on the pressure fingers, the margins of said opposed surfaces and one of said edges constituting retaining and positioning borders for mating with retaining slots in the fingers.
Claim 19
Dependent Claim
115 words
A blade seat for supporting a blade on a doctor blade assembly having a plurality of spaced apart pressure fingers, comprising: a thin elongated rectangular body having opposed first and second surfaces, and longitudinal opposed parallel edges, abutment means extending upwardly from the first surface parallel to and spaced unequally from the respective edges, the first surface between said respeCtive edges and the abutment means providing seatings to receive a doctor blade with its trailing edge against said abutment means, the second surface being shaped to rest on the pressure fingers, the margins of said opposed surfaces and one of said edges constituting retaining and positioning borders for mating with retaining slots in the fingers.
Claim 20
Dependent Claim
25 words
A blade seat, as defined in claim 16, in which the abutment means is a bar having a blade-contacting face perpendicular to the first surface.
Claim 21
Dependent Claim
167 words
A blade seat for supporting a blade on a doctor blade assembly having a plurality of spaced apart pressure fingers, comprising, a thin elongated rectangular body of non-metallic heat-resistant material having opposed first and second surfaces, and longitudinal opposed parallel edges, said body being provided in said first surface with a longitudinally extending groove parallel to said edges, abutment means in the form of a plurality of spaced apart elongated metallic segments set into said groove and secured to said body with each segment having an edge parallel to the edges of the body and standing up from the first surface, the first surface between at least one of said respective edges and the abutment means providing the seating to receive a doctor blade with its trailing edge against said abutment means, the second surface providing seatings to rest on the pressure fingers, the margins of said opposed surfaces and one of said edges constituting retaining and positioning borders for mating with retaining slots in the fingers.
Claim 22
Dependent Claim
167 words
A blade seat for supporting a blade on a doctor blade assembly having a plurality of spaced apart pressure fingers, comprising, a thin elongated rectangular body of non-metallic heat-resistant material having opposed first and second surfaces, and longitudinal opposed parallel edges, said body being provided in said first surface with a longitudinally extending groove parallel to said edges, abutment means in the form of a plurality of spaced apart elongated metallic segments set into said groove and secured to said body with each segment having an edge parallel to the edges of the body and standing up from the first surface, the first surface between at least one of said respective edges and the abutment means providing the seating to receive a doctor blade with its trailing edge against said abutment means, the second surface providing seatings to rest on the pressure fingers, the margins of said opposed surfaces and one of said edges constituting retaining and positioning borders for mating with retaining slots in the fingers.
Claim 23
Dependent Claim
44 words
A blade seat, as defined in claim 16, in which the abutment means are spaced unequally from the respective edges whereby at either side of the abutment means provides a seating to receive a doctor blade with its trailing edge against the abutment means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |