CA2268337A1 - Apparatus for detecting defects in wood processed by a planer - Google Patents
Apparatus for detecting defects in wood processed by a planer Download PDFInfo
- Publication number
- CA2268337A1 CA2268337A1 CA002268337A CA2268337A CA2268337A1 CA 2268337 A1 CA2268337 A1 CA 2268337A1 CA 002268337 A CA002268337 A CA 002268337A CA 2268337 A CA2268337 A CA 2268337A CA 2268337 A1 CA2268337 A1 CA 2268337A1
- Authority
- CA
- Canada
- Prior art keywords
- wood
- piece
- roller
- scanning means
- planer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/46—Wood
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/892—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
- G01N21/898—Irregularities in textured or patterned surfaces, e.g. textiles, wood
- G01N21/8986—Wood
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/12—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning
- H04N1/121—Feeding arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/19—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays
- H04N1/191—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a one-dimensional array, or a combination of one-dimensional arrays, or a substantially one-dimensional array, e.g. an array of staggered elements
- H04N1/192—Simultaneously or substantially simultaneously scanning picture elements on one main scanning line
- H04N1/193—Simultaneously or substantially simultaneously scanning picture elements on one main scanning line using electrically scanned linear arrays, e.g. linear CCD arrays
Description
APPARATUS FOR DETECTING DEFECTS IN WOOD PROCESSED BY A
PLANER
Field of the invention The present invention relates to an apparatus for detecting defects in wood, particularly wood which has been processed with a planer.
Description of the prior art It is known presently to visually inspect pieces of wood after they have been processed with a planer, in order to categorise the wood. This process is labour-intensive and time consuming, and requires considerable experience in order to properly grade the wood. Defects such as wane, twist, crook, skip and bow are evaluated.
Canadian patent application no. 2,237,640 describes an apparatus and method for detecting surface defects. The apparatus includes surface shape detection means for obtaining profile trace data of at least one surface of the article at a cross-section, the profile trace data being referenced to a reference system, data processing means for deriving a base reference curve from generally rectangular portions of the profile trace data and defect detecting means comparing the trace data with the base reference curve to recognise a defect induced departure of the trace data with respect to the base reference curve and to produce a defect output signal.
However, the apparatus described in this application does not necessarily work as expected since there are no means provided to maintain the article in a given position while the article is being scanned. Accordingly, the error margin is considerable, and it is extremely difficult for the apparatus to measure some of the defects.
PLANER
Field of the invention The present invention relates to an apparatus for detecting defects in wood, particularly wood which has been processed with a planer.
Description of the prior art It is known presently to visually inspect pieces of wood after they have been processed with a planer, in order to categorise the wood. This process is labour-intensive and time consuming, and requires considerable experience in order to properly grade the wood. Defects such as wane, twist, crook, skip and bow are evaluated.
Canadian patent application no. 2,237,640 describes an apparatus and method for detecting surface defects. The apparatus includes surface shape detection means for obtaining profile trace data of at least one surface of the article at a cross-section, the profile trace data being referenced to a reference system, data processing means for deriving a base reference curve from generally rectangular portions of the profile trace data and defect detecting means comparing the trace data with the base reference curve to recognise a defect induced departure of the trace data with respect to the base reference curve and to produce a defect output signal.
However, the apparatus described in this application does not necessarily work as expected since there are no means provided to maintain the article in a given position while the article is being scanned. Accordingly, the error margin is considerable, and it is extremely difficult for the apparatus to measure some of the defects.
2 Summary of the invention It is an object of the invention to provide an apparatus for detecting defects which reduces the computational power required to properly analyse an article by maintaining the article in a predetermined position while it is being scanned.
In accordance with the invention, this object is achieved with an apparatus for detecting defects in wood comprising:
a frame comprising an inlet, an outlet and scanning means located between the inlet and the outlet, the scanning means including an output for scanned data, the inlet being adapted for conveying a piece of wood towards the scanning means and roller means for securing the piece of wood as it is being fed into the scanning means;
the outlet including a trough for receiving the piece of wood and roller means for securing the piece of wood as it is being fed out of the scanning means;
the inlet and outlet roller means being arranged so that at any one time, the piece of wood is being held by at least two points;
computer means operatively connected to the scanning means for receiving the scanned data and processing the data; and control means for controlling the roller means and the scanning means to insure proper synchronisation.
Brief description of the drawings The present invention and its advantages will be more easily understood after reading the following non-restrictive description of preferred embodiments thereof, made with reference to the following drawings in which:
Figure 1 is a top plan view of the apparatus according to the present invention;
Figure 2 is a side elevational view of the apparatus of Fig. 1;
Figure 3 is a front elevational view of the apparatus of Fig. 1; and Figures 4a, 4b, 4c, 4d and 4e are schematic representations of the defects in wood the present invention can detect.
In accordance with the invention, this object is achieved with an apparatus for detecting defects in wood comprising:
a frame comprising an inlet, an outlet and scanning means located between the inlet and the outlet, the scanning means including an output for scanned data, the inlet being adapted for conveying a piece of wood towards the scanning means and roller means for securing the piece of wood as it is being fed into the scanning means;
the outlet including a trough for receiving the piece of wood and roller means for securing the piece of wood as it is being fed out of the scanning means;
the inlet and outlet roller means being arranged so that at any one time, the piece of wood is being held by at least two points;
computer means operatively connected to the scanning means for receiving the scanned data and processing the data; and control means for controlling the roller means and the scanning means to insure proper synchronisation.
Brief description of the drawings The present invention and its advantages will be more easily understood after reading the following non-restrictive description of preferred embodiments thereof, made with reference to the following drawings in which:
Figure 1 is a top plan view of the apparatus according to the present invention;
Figure 2 is a side elevational view of the apparatus of Fig. 1;
Figure 3 is a front elevational view of the apparatus of Fig. 1; and Figures 4a, 4b, 4c, 4d and 4e are schematic representations of the defects in wood the present invention can detect.
3 Description of a preferred embodiment of the invention The present invention is directed to an apparatus for detecting defects in wood. Such an apparatus is preferably placed at the output of a typical wood planer.
The apparatus 1 includes a frame 10 comprising an inlet 20, an outlet 30 and scanning means 40 located between the inlet 20 and the outlet 30, the scanning means 40 including an output for scanned data. The inlet 20 may include conveyor means for conveying a piece of wood towards the scanning means and but definitely includes roller means 21 for securing the piece of wood as it is being fed into the scanning means 40; and the outlet 30 includes a platform for receiving the piece of wood and roller means 31 for securing the piece of wood as it is being fed out of the scanning means 40. The inlet and outlet roller means 21, 31 are arranged so that at any one time, the piece of wood is being held by at least two points, as will be hereinafter detailed.
The apparatus 1 also includes computer means (not shown) operatively connected to the scanning means 40 for receiving the scanned data and processing the data; and control means for controlling the conveyor means and the scanning means to insure proper synchronisation.
The inlet includes a U-shaped trough 23 for receiving and guiding a piece of wood. The U-shaped trough is in direct communication with the outlet of the planer. The U-shaped trough has a top and a bottom, each provided with roller means 31. The width of the trough and the height thereof are adapted to guide and receive a piece of wood. Advantageously, the width and the height can be adjusted so that the apparatus according to the invention can handle pieces of wood varying in size from 1" to 4" thickness and 3" to 10" width.
Consequently, the rollers must be adjustable also to account for variations in the thickness of the piece of wood. Preferably, the inlet includes two roller assemblies 21, as better shown in Figs. 1 and 2. The roller assemblies each comprise a top roller and a bottom roller, so that the piece of wood is held and guided on its top and bottom surface by the top and bottom rollers. Since the inlet 20 includes two roller
The apparatus 1 includes a frame 10 comprising an inlet 20, an outlet 30 and scanning means 40 located between the inlet 20 and the outlet 30, the scanning means 40 including an output for scanned data. The inlet 20 may include conveyor means for conveying a piece of wood towards the scanning means and but definitely includes roller means 21 for securing the piece of wood as it is being fed into the scanning means 40; and the outlet 30 includes a platform for receiving the piece of wood and roller means 31 for securing the piece of wood as it is being fed out of the scanning means 40. The inlet and outlet roller means 21, 31 are arranged so that at any one time, the piece of wood is being held by at least two points, as will be hereinafter detailed.
The apparatus 1 also includes computer means (not shown) operatively connected to the scanning means 40 for receiving the scanned data and processing the data; and control means for controlling the conveyor means and the scanning means to insure proper synchronisation.
The inlet includes a U-shaped trough 23 for receiving and guiding a piece of wood. The U-shaped trough is in direct communication with the outlet of the planer. The U-shaped trough has a top and a bottom, each provided with roller means 31. The width of the trough and the height thereof are adapted to guide and receive a piece of wood. Advantageously, the width and the height can be adjusted so that the apparatus according to the invention can handle pieces of wood varying in size from 1" to 4" thickness and 3" to 10" width.
Consequently, the rollers must be adjustable also to account for variations in the thickness of the piece of wood. Preferably, the inlet includes two roller assemblies 21, as better shown in Figs. 1 and 2. The roller assemblies each comprise a top roller and a bottom roller, so that the piece of wood is held and guided on its top and bottom surface by the top and bottom rollers. Since the inlet 20 includes two roller
4 assemblies, the distance between each of the roller assemblies is such that it is smaller that the length of the piece of wood.
The outlet 30 has the same configuration as the inlet, except for the fact that the outlet does not include the conveyor means since once the piece of wood has passed through the scanning means, it is ejected at considerable speed and the outlet only has a U-shaped trough 33 for guiding the piece of wood.
Consequently, the outlet has a U-shaped trough 33 having a width and a height in direct communication with the scanning means 40. The width and the height of the trough are adapted to guide and receive a piece of wood, and are also preferably adjustable. The U-shaped trough is provided with roller means.
Preferably, the outlet includes two roller assemblies 31, as better shown in Figs. 1 and 2. The roller assemblies 31 each comprise a top roller and a bottom roller, so that the piece of wood is held and guided on its top and bottom surface by the top and bottom rollers. Since the outlet includes two roller assemblies, the distance between each of the roller assemblies is such that it is smaller than the length of the piece of wood.
Furthermore, in order that at any one time the piece of wood is held by at least two points as it travels through the apparatus of the invention, the distance between the roller assemblies of the outlet and the inlet adjacent the scanning means is smaller than the length of the piece of wood.
As mentioned above, the apparatus also includes control means for controlling the roller means 21, 31 and the scanning means 40 to insure proper synchronisation. To that effect, the rollers are driven either directly or through gears or straps by a motor, which is synchronised with the planer, so that the surface speed of the rollers corresponds to the speed at about 10% higher of the piece of wood being ejected from the planer. If the inlet means also includes conveyor means, the conveyor means also are controlled and synchronised with the motor.
In use, the piece of wood is ejected from the planer and engaged by the inlet means. The inlet means hold the piece of wood and guide it into the scanning means. The piece of wood travels through the scanning means and then is guided into the outlet means, which in turn engage the piece of wood and eject it therefrom for further processing.
The scanning means includes optical means for projecting a beam of light onto the piece of wood as it travels through the scanning means and detection
The outlet 30 has the same configuration as the inlet, except for the fact that the outlet does not include the conveyor means since once the piece of wood has passed through the scanning means, it is ejected at considerable speed and the outlet only has a U-shaped trough 33 for guiding the piece of wood.
Consequently, the outlet has a U-shaped trough 33 having a width and a height in direct communication with the scanning means 40. The width and the height of the trough are adapted to guide and receive a piece of wood, and are also preferably adjustable. The U-shaped trough is provided with roller means.
Preferably, the outlet includes two roller assemblies 31, as better shown in Figs. 1 and 2. The roller assemblies 31 each comprise a top roller and a bottom roller, so that the piece of wood is held and guided on its top and bottom surface by the top and bottom rollers. Since the outlet includes two roller assemblies, the distance between each of the roller assemblies is such that it is smaller than the length of the piece of wood.
Furthermore, in order that at any one time the piece of wood is held by at least two points as it travels through the apparatus of the invention, the distance between the roller assemblies of the outlet and the inlet adjacent the scanning means is smaller than the length of the piece of wood.
As mentioned above, the apparatus also includes control means for controlling the roller means 21, 31 and the scanning means 40 to insure proper synchronisation. To that effect, the rollers are driven either directly or through gears or straps by a motor, which is synchronised with the planer, so that the surface speed of the rollers corresponds to the speed at about 10% higher of the piece of wood being ejected from the planer. If the inlet means also includes conveyor means, the conveyor means also are controlled and synchronised with the motor.
In use, the piece of wood is ejected from the planer and engaged by the inlet means. The inlet means hold the piece of wood and guide it into the scanning means. The piece of wood travels through the scanning means and then is guided into the outlet means, which in turn engage the piece of wood and eject it therefrom for further processing.
The scanning means includes optical means for projecting a beam of light onto the piece of wood as it travels through the scanning means and detection
5 means for receiving the beam of light. The detection means are connected to the output means of the scanning means.
The scanning means preferably include four lasers 41, each of the lasers being oriented at an angle with respect to each of the four surfaces of the piece of wood (see Figs. 1 and 2). Each of the lasers has associated therewith a detector, for receiving the light shined on the corresponding surface of the piece of wood.
The data collected by each of the detectors is transmitted to a computer means which analyses the data and produces useful information.
More specifically, the data is used to produce a three-dimensional representation of the piece of wood as it is scanned. The three-dimensional representation is then analysed according to various defects (Figs. 4a to 4e are representative of the various defects which can be recognised by the present invention), and a grading of the piece of wood is then obtained.
The scanning means scan a profile of the piece of wood every one half inch (1.7 cm) with a tolerance of 10/1000 of an inch.
The purpose of the provision of the roller means is to hold the piece of wood firmly as it is being scanned, which increases considerably the reliability of the scanning means. More specifically, the accuracy of the wane, twist and bow of the piece of wood is far better evaluated when the piece of wood is held as opposed to scanning the piece of wood in a free-standing mode.
In order to further optimise the apparatus of the present invention and subsequent processing of the wood, the apparatus may further be provided with a printer at the outlet thereof, the printed being connected to the computer means and printing a code on the piece of wood for identification purposes.
Preferably, the printer is an ink jet with ultraviolet ink printer, so that the wood does not become visibly marked by the printing operation.
The scanning means preferably include four lasers 41, each of the lasers being oriented at an angle with respect to each of the four surfaces of the piece of wood (see Figs. 1 and 2). Each of the lasers has associated therewith a detector, for receiving the light shined on the corresponding surface of the piece of wood.
The data collected by each of the detectors is transmitted to a computer means which analyses the data and produces useful information.
More specifically, the data is used to produce a three-dimensional representation of the piece of wood as it is scanned. The three-dimensional representation is then analysed according to various defects (Figs. 4a to 4e are representative of the various defects which can be recognised by the present invention), and a grading of the piece of wood is then obtained.
The scanning means scan a profile of the piece of wood every one half inch (1.7 cm) with a tolerance of 10/1000 of an inch.
The purpose of the provision of the roller means is to hold the piece of wood firmly as it is being scanned, which increases considerably the reliability of the scanning means. More specifically, the accuracy of the wane, twist and bow of the piece of wood is far better evaluated when the piece of wood is held as opposed to scanning the piece of wood in a free-standing mode.
In order to further optimise the apparatus of the present invention and subsequent processing of the wood, the apparatus may further be provided with a printer at the outlet thereof, the printed being connected to the computer means and printing a code on the piece of wood for identification purposes.
Preferably, the printer is an ink jet with ultraviolet ink printer, so that the wood does not become visibly marked by the printing operation.
6 It should be noted that the present apparatus can scan approximately 180 pieces of ten feet long wood a minute, or at a rate of approximately 2000 feet a minute.
It should be also noted that the scanning means can further advantageously be provided with an X-ray means for evaluating the degree of rot within the piece of wood.
Although the present invention has been explained hereinabove by way of a preferred embodiment thereof, it should be pointed out that any modifications to this preferred embodiment within the scope of the appended claims is not deemed to alter of change the nature and scope of the present invention.
It should be also noted that the scanning means can further advantageously be provided with an X-ray means for evaluating the degree of rot within the piece of wood.
Although the present invention has been explained hereinabove by way of a preferred embodiment thereof, it should be pointed out that any modifications to this preferred embodiment within the scope of the appended claims is not deemed to alter of change the nature and scope of the present invention.
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002268337A CA2268337A1 (en) | 1999-04-16 | 1999-04-16 | Apparatus for detecting defects in wood processed by a planer |
| US09/549,705 US6366351B1 (en) | 1999-04-16 | 2000-04-14 | Apparatus for detecting defects in wood processed by a planer |
| CA 2306094 CA2306094C (en) | 1999-04-16 | 2000-04-14 | Apparatus for detecting defects in wood processed by a planer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002268337A CA2268337A1 (en) | 1999-04-16 | 1999-04-16 | Apparatus for detecting defects in wood processed by a planer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2268337A1 true CA2268337A1 (en) | 2000-10-16 |
Family
ID=4163442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002268337A Abandoned CA2268337A1 (en) | 1999-04-16 | 1999-04-16 | Apparatus for detecting defects in wood processed by a planer |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US6366351B1 (en) |
| CA (1) | CA2268337A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112986128A (en) * | 2021-03-19 | 2021-06-18 | 义乌市秋柔贸易有限公司 | Timber surface quality check out test set |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2422499A1 (en) | 2003-03-18 | 2004-09-18 | Autolog Inc. | System and method for printing a code on an elongate article and the code so printed |
| CA2485668A1 (en) * | 2004-10-21 | 2006-04-21 | Stuart G. Moore | Method and system for detecting characteristics of lumber using end scanning |
| US7938156B2 (en) * | 2006-04-20 | 2011-05-10 | Weyerhaeuser Nr Company | Method for optimizing lumber |
| AT504537B1 (en) * | 2006-10-09 | 2008-09-15 | Josef Lumplecker | ANNEX TO THE MACHINE MANUFACTURE AND CLASSIFICATION OF BRETTES AND BEAMS OF WOOD |
| US8131008B2 (en) | 2007-01-31 | 2012-03-06 | Building Component Verification Systems, Inc. | Methods, apparatuses, and systems for image-based measurement and inspection of pre-engineered structural components |
| US8502180B2 (en) | 2009-01-26 | 2013-08-06 | Centre De Recherche Industrielle Du Quebec | Apparatus and method having dual sensor unit with first and second sensing fields crossed one another for scanning the surface of a moving article |
| DE102012000606B4 (en) * | 2012-01-14 | 2020-09-24 | Hans Hundegger | Woodworking plant |
| US9958428B2 (en) * | 2014-10-09 | 2018-05-01 | Haskan, Llc | Scanning system for wood |
| CN114192880A (en) * | 2021-12-17 | 2022-03-18 | 北京星瑞达建筑工程有限责任公司 | Automatic cutting and carrying operation table |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3566121A (en) | 1968-11-25 | 1971-02-23 | Welsh Panel Co | Detecting internal characteristics of light pervious material |
| US3627005A (en) * | 1969-04-15 | 1971-12-14 | David L Morton | Machine for cutting peeler cores or logs into studs and chips |
| US3687260A (en) * | 1971-01-20 | 1972-08-29 | Potlatch Forests Inc | Edging picker |
| US3827545A (en) | 1972-12-04 | 1974-08-06 | Scott Paper Co | Method and apparatus for changing the spacing between discrete, flexible web product |
| US4172417A (en) | 1973-04-18 | 1979-10-30 | Hotchkiss Brandt Sogeme | Apparatus for high speed marking of articles |
| US4067370A (en) * | 1976-10-18 | 1978-01-10 | Chang Chen Wan | Automatic plank planing machine |
| US4078592A (en) * | 1976-12-20 | 1978-03-14 | Standal George M | Log feed mechanism for sawmills |
| FI54273B (en) | 1977-01-13 | 1978-07-31 | Plan Sell Oy | ANORDNING FOER DOSERING AV TRAEVARA |
| US4356045A (en) * | 1980-05-30 | 1982-10-26 | St. Regis Paper Company | Complete production line of wood I-joist manufacturing apparatus the method of manufacture, and the I-joist product, having lumber chords and a plywood web |
| US4879752A (en) * | 1987-11-18 | 1989-11-07 | Macmillan Bloedel Limited | Lumber optimizer |
| US4947909A (en) * | 1989-02-14 | 1990-08-14 | Cae Machinery Ltd. | Process and apparatus for optimizing volume of boards cut from a log |
| US5252836A (en) * | 1991-03-07 | 1993-10-12 | U.S. Natural Resources, Inc. | Reflective grain defect scanning |
| US5232030A (en) * | 1992-06-09 | 1993-08-03 | U.S. Natural Resources, Inc. | Cooperative conveyor system for canter and saw |
| EP0598858A4 (en) * | 1992-06-15 | 1994-12-07 | Alpine Eng Prod | Automatic saw machine and method. |
| US5506914A (en) * | 1994-10-03 | 1996-04-09 | Baker; James F. | Automated truss inspection system |
| US5676238A (en) * | 1995-06-07 | 1997-10-14 | U.S. Natural Resources, Inc. | Hold down rollers for a log conveyor |
| US5644392A (en) * | 1995-09-12 | 1997-07-01 | U.S. Natural Resources, Inc. | Scanning system for lumber |
| US5765617A (en) * | 1996-12-27 | 1998-06-16 | U.S. Natural Resources, Inc. | Infeed system for lumber |
| US5918653A (en) * | 1998-06-17 | 1999-07-06 | U. S. Natural Resources | Adjustable support for conveyor |
-
1999
- 1999-04-16 CA CA002268337A patent/CA2268337A1/en not_active Abandoned
-
2000
- 2000-04-14 US US09/549,705 patent/US6366351B1/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112986128A (en) * | 2021-03-19 | 2021-06-18 | 义乌市秋柔贸易有限公司 | Timber surface quality check out test set |
Also Published As
| Publication number | Publication date |
|---|---|
| US6366351B1 (en) | 2002-04-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |