US2379141A - Polishing wheel construction - Google Patents
Polishing wheel construction Download PDFInfo
- Publication number
- US2379141A US2379141A US556354A US55635444A US2379141A US 2379141 A US2379141 A US 2379141A US 556354 A US556354 A US 556354A US 55635444 A US55635444 A US 55635444A US 2379141 A US2379141 A US 2379141A
- Authority
- US
- United States
- Prior art keywords
- mounting plate
- circular members
- members
- polishing
- floating
- 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.)
- Expired - Lifetime
Links
- 238000005498 polishing Methods 0.000 title description 60
- 238000010276 construction Methods 0.000 title description 17
- 239000002657 fibrous material Substances 0.000 description 9
- 238000004140 cleaning Methods 0.000 description 8
- 230000000295 complement effect Effects 0.000 description 7
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 244000228957 Ferula foetida Species 0.000 description 1
- 230000035508 accumulation Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
- B24D13/14—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by the front face
Definitions
- My invention relates to cleaning and polishing devices and more particularly to the construction of a polishing wheel for a cleaning device which is adapted to clean space bands, such as are used with Linotype printing equipment.
- the space bands In casting type on Linotype machines, the space bands, such as are used to separate words I in each line, require frequent polishing andclean ing as well as regular graphite lubrication of the dovetail interconnection between the long wedge and the sleeve or short wedge of the space band.
- the sleeve tends to collect a small oxide stain at the casting point, and if this is allowed to accumulate and is not removed, the band will fail to provide a tight lockup with the matrices,
- thisv polishing face of the wheel is formedby a pluralityof circular polishing members offlbrous material such'as the end grain of wooden rings to Whichhjpolis'hing material, such as graphite, maybe'applie'd in any suitable manner.
- thisv polishing wheel includesfour such polishing rings," and the outermost and innermost of. these rings are adapted to besec'ur'ed to'the mounting plateI to provide relatively fixed circular ring.
- polishing face of the polishing wheel should provide a yielding force exerted against the surface of the space band which is to be cleaned and that this can best be obtained by an improved polishing wheel construction formed of several polishing ring members adapted to be biasedresiliently towards the space band which is to be cleaned.
- An object of my invention is to provide animproved polishing wheel construction.
- Another object of my invention is to provide'an improved polishing wheel construction fora space band cleaning machine having a plurality of cir-,
- Fig. 2 is a sectional View, taken along line 2-2 of Fig. 1, ofmy improved polishing wheel.
- a circular mounting plate member I is provided with a hub 2 adapted to be mounted on members thereon. 2 ⁇
- the 1 outermost ring member I is secured to'the mounting plate I byaplurality of wood screws orjsiinilar retaining elements8 and'is formed on its innerisurface with two undercut grooves 9 and II).
- the outer undercut grooveB' extends over a flange II'formed on the mounting plate I which is adapted to support the outermost polishing ring I with a slight clearance between the inner face of the polishingring 'I and the outer face of the mounting plateil. This assures a very tight and secure fit'between the ring I and the mounting plate I.
- the innermost circular polishing member I2 is secured to the v mounting'plate' I by a plurality of wood screws I3 or similar retaining elements which threadedly engage the circular polishing member I2, and ex,- tend' freely through the openings 5 in the mounting plate I, therebyfixedly securing the'circular member I2 to the mountin plate.
- Other ci'r-' cular polishing rings are arranged as floating elements which are adapted to be biased out-i ring members comprise two rings I I and I5 which have an'axial depth less than the distance from the outerface of the fixed circular members I and I2 to the adjacent face of the mounting plate I, and both of these rings are formed with I radially outwardly extending flange elements I6 and I!
- Both of these floating ring are biased resiliently outwardly by a plurality of coil springs l9 and 20 arranged under compression between the mounting plate I and the floating ring members in pockets 2
- a drive pin is secured to the mounting plate I and arrangedin engagement in a complementary pocket 24 extending intothe inner portion of each floating ring member.
- These drive pins 23 extend loosely in the pockets 24 in order to prevent binding of the floating, rings on the drive pin and to permit a free float-' ing movement of the rings against the biasin springs l9 andj20.
- I'hi'slwheel construction provides a desirable resilient Ipolishinfg' surface to the polishing wheel which isnot'obtainable by a conventional fixed flat polishing surface, and, in addition, provides a construction which can'readily be repaired'and in which the parts can readily be replaced with renewal parts when necessary.
- a polishing wheel construction including a mounting plate member adapted to be supported on a drive shaft, four concentric circular polishing members of fibrous material, means for securing the innerand outer of said circular members to said mounting plate for providing relatively fixed circular members on said mounting plate, means for loosely'retaining the otheroflsaid circular members as floating circular members in position between said fixed circular members, resilient means for biasingv said floating circular members in a direction awayfromsaid mounting plate member, and means for providing a driving connection between saidflo'ating 'c'ircularmembers and said mounting plate.
- a polishing wheel construction for a space band cleaning machine including a mounting plate member adapted to be supported on a drive shaft, a plurality of circular polishing members of fibrous material, means for securing the inner and outer of said circular members to said mounting plate for providing relatively fixed circular members on said mounting plate, means for loosely retaining the other of said'circular members as floating circular members in position between said'fixed circular members, resilient means for biasing said floatin circular members in a direction away from said mounting plate member, and means secured to said mounting plate and arranged in engagement with said floating circular members for providing a driving connection between said floating circular members and said on a drive shaft, a plurality of polishing circular members of fibrous material, means for securing certain of said circular members to said mounting plate for providing relatively fixed circular member on said mounting plate, means including a groove in each of said relatively fixed circular members and a complementary outwardly extending element on each of the other of said circular members each arranged loosely in one of said grooves for retaining said other. circular members as floating circular members in position adjacent said
- a polishing wheel construction including a mounting plate member adapted to be supported on a drive shaft, a plurality of polishing circular members of fibrous material, means for securing the inner and outer of said circular members to said mounting plate for providing relatively fixed circular members on said mounting plate, means for loosely retaining the other of said circularmembers as floating circular members in position between said fixed circular members, resilient means including coil springs under compression arranged between said mounting plate and said floating circular members for biasing said floating circular members in a direction-away from said mounting plate member, and means including a drive pin secured to said mounting plate and arranged in engagement with said floating circular members for providing a driving connection between said floating circular members and said mounting plate.
- a polishing wheel construction including a mounting plate'member adapted to be supported on a drive shaft, a plurality of polishing circular members of fibrous material, means for securing certain of said circular members to said mounting plate for providing relatively fixed circular members on said mounting plate, means including a groove in each of said relatively fixed circular members and a complementary outwardly extending element on each of the other of said circular members each arranged loosely in one of said.
- resilient means including coil springs under compression arranged between said mounting plate and said floating circular members for biasing said floating circular members in a direction away from said mounting plate member, and means secured to said mounting plate and arranged in engagement with said floating circular members for providing a driving connection between said floating circular members and said mounting plate.
- a polishing wheel construction for a space band cleaning machine including a mounting plate member adapted to be supported on a drive shaft, four concentric polishing circular members of fibrous material, means for securing the inner and outer of said circular members to said mounting plate for providing relatively fixed circular members on said mounting plate, means including a groove in each of said relatively fixed circular members and a complementary outwardly extending element on each of the other of said circular members each arranged loosely in the groove in the adjacent fixed circular member for retaining said other circular members as floating circular members in position between said fixed circular members, resilient means for biasing said floating circular members in a direction away from said mounting plate member, means for providing a driving connection between said floating circular members and said mounting plate, and a beveled edge on the inner edge of the polishing outer face of said floating circular member nearest the innermost of said fixed circular members.
- a polishing wheel construction for a space band cleaning machine including a mounting plate member adapted to be supported on a drive shaft, four concentric polishing circular members of fibrous material, means for securing the inner and outer of said circular members to said mounting plate for providing relatively fixed circular members on said mounting plate, means including a groove in each of said relatively fixed circular members and a complementary outwardly extending element on each of the other of said circular members each arranged loosely in the groove in the adjacent fixed circular member for retaining said other circular members as floating circular members in position between said fixed circular members, resilient means ineluding coil springs under compression arranged 9.
- a polishing wheel construction for a space band cleaning machine including a mounting plate member adapted to be supported on a drive shaft, a plurality of polishing circular members of fibrous material, means for securing certain of said circular members to said mounting plate for providing relatively fixed circular members on said mounting plate, means including an undercut groove in each of said relatively fixed circular members and a complementary outwardly extending flange element on each of the other of said circular members each arranged loosely in one of said grooves for retaining said flanged circular members as floating circular members in position with a limited amount of axial floating movement adjacent said fixed circular members, resilient means including coil springs under compression arranged between said mounting plate and said floating circular members in pockets in said floating circular member for biasing said floating circular members in a direction away from said mounting plate member, means including a drive pin secured to said mounting plate and arranged in engagement with a complementary pocket in each of said floating circular members for providing a driving connection between said floatin circular members and said mounting plate, and a beveled edge on the inner edge of the polishing face of
- a polishing wheel construction including a mounting plate member adapted to be supported on a drive shaft, a plurality of polishing members, and means for fixedly securing certain of said polishing members to said mounting plate and for loosely mounting and resiliently biasing outwardly certain other of said polishing members providing a resiliently deformable polishing surface for following irregularities in the surface of an object to be polished.
- a polishing wheel construction including a mounting plate member adapted to be supported on a drive shaft, a plurality of polishing circular members of fibrous material forming a polishing face, means for securing the inner and outer of said circular members to said mounting plate for providing relatively fixed circular members on said mounting plate, means for loosely retaining the other of said circular members as floating ring members extending a predetermined distance beyond the polishing face of said fixed circular members in position between said fixed circular members, resilient means for biasing said floating circular members in a direction away from said mounting plate member, and means secured to said mounting plate and arranged in engagement with said floating circular members for providing a driving connection between said floating circular members and said mounting plate.
Description
June 26, 1945. G. s. FULLER I 2,379,141
POLISHING WHEEL CONSTRUCTION Filed Sept. 29, 1944 Gerald S. Fuller,
His Attor-ne'gi Patented June 26, 1945 POLISHING WHEEL cons'r worron Gerald s. Fuller, schenaeagnj Application September 29, 1944, Serial No. 556,354I' 12 Claims. (01. 51-4195 f My invention relates to cleaning and polishing devices and more particularly to the construction of a polishing wheel for a cleaning device which is adapted to clean space bands, such as are used with Linotype printing equipment.
In casting type on Linotype machines, the space bands, such as are used to separate words I in each line, require frequent polishing andclean ing as well as regular graphite lubrication of the dovetail interconnection between the long wedge and the sleeve or short wedge of the space band. In use, the sleeve tends to collect a small oxide stain at the casting point, and if this is allowed to accumulate and is not removed, the band will fail to provide a tight lockup with the matrices,
so that a small fin of metal will be formed on the casting which will result in objectionable hairlines adjacent the letters. 2,288,944, July '7, 1942, I have disclosed an improved space band cleaning device or machine for adrivev shaft 3. This mounting platefisfl secured in 'positionlon the drive shaft inanylsuitable manner, as by a s'etscr'ew. .4', and is forme'd with a pluralityof circumferentially spaced apart'screw openings 5 'and'fi arranged in two rows through theplate I for securing ,polishingring's thereto by suitable screws. 'The polishing face of the wheel is formedby a pluralityof circular polishing members offlbrous material such'as the end grain of wooden rings to Whichhjpolis'hing material, such as graphite, maybe'applie'd in any suitable manner. In theillustrated arrangement, thisv polishing wheel includesfour such polishing rings," and the outermost and innermost of. these rings are adapted to besec'ur'ed to'the mounting plateI to provide relatively fixed circular ring In my Patent No.
removing objectionable deposits or accumulations on space bands which may result as described above. I have found that it is desirable that the polishing face of the polishing wheel should provide a yielding force exerted against the surface of the space band which is to be cleaned and that this can best be obtained by an improved polishing wheel construction formed of several polishing ring members adapted to be biasedresiliently towards the space band which is to be cleaned.
An object of my invention is to provide animproved polishing wheel construction.
Another object of my invention is to provide'an improved polishing wheel construction fora space band cleaning machine having a plurality of cir-,
bodiment of my invention; and Fig. 2 is a sectional View, taken along line 2-2 of Fig. 1, ofmy improved polishing wheel.
Referring to the drawing, I have shown an em bodiment of my improved polishing 1 wheel in which a circular mounting plate member I is provided with a hub 2 adapted to be mounted on members thereon. 2} The 1 outermost ring member I is secured to'the mounting plate I byaplurality of wood screws orjsiinilar retaining elements8 and'is formed on its innerisurface with two undercut grooves 9 and II). The outer undercut grooveB'extends over a flange II'formed on the mounting plate I which is adapted to support the outermost polishing ring I with a slight clearance between the inner face of the polishingring 'I and the outer face of the mounting plateil. This assures a very tight and secure fit'between the ring I and the mounting plate I. The innermost circular polishing member I2 is secured to the v mounting'plate' I by a plurality of wood screws I3 or similar retaining elements which threadedly engage the circular polishing member I2, and ex,- tend' freely through the openings 5 in the mounting plate I, therebyfixedly securing the'circular member I2 to the mountin plate. Other ci'r-' cular polishing rings are arranged as floating elements which are adapted to be biased out-i ring members comprise two rings I I and I5 which have an'axial depth less than the distance from the outerface of the fixed circular members I and I2 to the adjacent face of the mounting plate I, and both of these rings are formed with I radially outwardly extending flange elements I6 and I! which are arranged loosely in the undercut grooves lfl'and I8 in the fixed circular polishing members I and I2, respectively, for loosely retaining the floating polishing ring members I4 and I5 in position between the relatively fixed mounting plate I. Both of these floating ring are biased resiliently outwardly by a plurality of coil springs l9 and 20 arranged under compression between the mounting plate I and the floating ring members in pockets 2| and 22 in the floating ring members [4 and I5, respectively, for biasing the floating ring members in a direction away from the mounting platemember and toward the outer face of the polishing wheel to extend a predetermined distance beyond the polishing face of the fixed ring members and thereby provide a resiliently deformable polishing surface for following as nearly as possible irregularities in the surface of a space band or other object which is being polished. In order toassurethat each of the floating circular ring members I4 and I5 will rotate with the polishing wheel circular members 1 and I2, a drive pin is secured to the mounting plate I and arrangedin engagement in a complementary pocket 24 extending intothe inner portion of each floating ring member. These drive pins 23 extend loosely in the pockets 24 in order to prevent binding of the floating, rings on the drive pin and to permit a free float-' ing movement of the rings against the biasin springs l9 andj20. As shown in Fig. 1, it'has been found desirable to provide twice the number of biasing springs l9for the outer larger diameter floating ring [4 as for the inner floating'smaller diameter ring [5. In addition, I have found it desirable to provide a slightly beveled inner edge 25 on the polishing outer face of the innermost floating ring member adjacent the inner fixed circular member [2. This beveled edge provides for a smoother operation of the polishing wheel and prevents jamming or the edge of the inner.
floating ring member l5 against any sharp edges on a space band or similar article whichis being polished by the polishing wheel, as it provides a guiding surface for depressing the'fl'oating ring member l5 as it contacts the edge or end of the article which is being polished. I'hi'slwheel construction provides a desirable resilient Ipolishinfg' surface to the polishing wheel which isnot'obtainable by a conventional fixed flat polishing surface, and, in addition, provides a construction which can'readily be repaired'and in which the parts can readily be replaced with renewal parts when necessary.
While I have illustrated and described a particular embodiment of myinvent'ion, modifications thereofv will occur to those skilled in the art. I desire it to be understood, therefore, that my invention is notto be limited to the particular arrangement disclosed, and I intend in the appended claims to cover all modifications which do not depart from the spirit and scope of my invention.
What I claim asv new and desire to secure by Letters Patent of the'United States is:
1. A polishing wheel construction including a mounting plate member adapted to be supported on a drive shaft, four concentric circular polishing members of fibrous material, means for securing the innerand outer of said circular members to said mounting plate for providing relatively fixed circular members on said mounting plate, means for loosely'retaining the otheroflsaid circular members as floating circular members in position between said fixed circular members, resilient means for biasingv said floating circular members in a direction awayfromsaid mounting plate member, and means for providing a driving connection between saidflo'ating 'c'ircularmembers and said mounting plate. f t
2. A polishing wheel constructionfor a space member, and means for providing a driving conne ction between said floating circular member and said mounting plate.
3. A polishing wheel construction for a space band cleaning machine including a mounting plate member adapted to be supported on a drive shaft, a plurality of circular polishing members of fibrous material, means for securing the inner and outer of said circular members to said mounting plate for providing relatively fixed circular members on said mounting plate, means for loosely retaining the other of said'circular members as floating circular members in position between said'fixed circular members, resilient means for biasing said floatin circular members in a direction away from said mounting plate member, and means secured to said mounting plate and arranged in engagement with said floating circular members for providing a driving connection between said floating circular members and said on a drive shaft, a plurality of polishing circular members of fibrous material, means for securing certain of said circular members to said mounting plate for providing relatively fixed circular member on said mounting plate, means including a groove in each of said relatively fixed circular members and a complementary outwardly extending element on each of the other of said circular members each arranged loosely in one of said grooves for retaining said other. circular members as floating circular members in position adjacent said fixed circular members, resilient means for biasing said floating circular members in' a direction away from said mounting plate member, and means for providing a driving connection between said floating circular members and said mounting plate.
'5. A polishing wheel construction including a mounting plate member adapted to be supported on a drive shaft, a plurality of polishing circular members of fibrous material, means for securing the inner and outer of said circular members to said mounting plate for providing relatively fixed circular members on said mounting plate, means for loosely retaining the other of said circularmembers as floating circular members in position between said fixed circular members, resilient means including coil springs under compression arranged between said mounting plate and said floating circular members for biasing said floating circular members in a direction-away from said mounting plate member, and means including a drive pin secured to said mounting plate and arranged in engagement with said floating circular members for providing a driving connection between said floating circular members and said mounting plate.
6. A polishing wheel construction including a mounting plate'member adapted to be supported on a drive shaft, a plurality of polishing circular members of fibrous material, means for securing certain of said circular members to said mounting plate for providing relatively fixed circular members on said mounting plate, means including a groove in each of said relatively fixed circular members and a complementary outwardly extending element on each of the other of said circular members each arranged loosely in one of said. grooves for retaining said other circular members as floating circular members in position adjacent said fixed circular members, resilient means including coil springs under compression arranged between said mounting plate and said floating circular members for biasing said floating circular members in a direction away from said mounting plate member, and means secured to said mounting plate and arranged in engagement with said floating circular members for providing a driving connection between said floating circular members and said mounting plate.
'7. A polishing wheel construction for a space band cleaning machine including a mounting plate member adapted to be supported on a drive shaft, four concentric polishing circular members of fibrous material, means for securing the inner and outer of said circular members to said mounting plate for providing relatively fixed circular members on said mounting plate, means including a groove in each of said relatively fixed circular members and a complementary outwardly extending element on each of the other of said circular members each arranged loosely in the groove in the adjacent fixed circular member for retaining said other circular members as floating circular members in position between said fixed circular members, resilient means for biasing said floating circular members in a direction away from said mounting plate member, means for providing a driving connection between said floating circular members and said mounting plate, and a beveled edge on the inner edge of the polishing outer face of said floating circular member nearest the innermost of said fixed circular members.
8. A polishing wheel construction for a space band cleaning machine including a mounting plate member adapted to be supported on a drive shaft, four concentric polishing circular members of fibrous material, means for securing the inner and outer of said circular members to said mounting plate for providing relatively fixed circular members on said mounting plate, means including a groove in each of said relatively fixed circular members and a complementary outwardly extending element on each of the other of said circular members each arranged loosely in the groove in the adjacent fixed circular member for retaining said other circular members as floating circular members in position between said fixed circular members, resilient means ineluding coil springs under compression arranged 9. A polishing wheel construction for a space band cleaning machine including a mounting plate member adapted to be supported on a drive shaft, a plurality of polishing circular members of fibrous material, means for securing certain of said circular members to said mounting plate for providing relatively fixed circular members on said mounting plate, means including an undercut groove in each of said relatively fixed circular members and a complementary outwardly extending flange element on each of the other of said circular members each arranged loosely in one of said grooves for retaining said flanged circular members as floating circular members in position with a limited amount of axial floating movement adjacent said fixed circular members, resilient means including coil springs under compression arranged between said mounting plate and said floating circular members in pockets in said floating circular member for biasing said floating circular members in a direction away from said mounting plate member, means including a drive pin secured to said mounting plate and arranged in engagement with a complementary pocket in each of said floating circular members for providing a driving connection between said floatin circular members and said mounting plate, and a beveled edge on the inner edge of the polishing face of said floating circular member nearest the innermost of said fixed circular members.
10. A polishing wheel construction including a mounting plate member adapted to be supported on a drive shaft, a plurality of polishing members, and means for fixedly securing certain of said polishing members to said mounting plate and for loosely mounting and resiliently biasing outwardly certain other of said polishing members providing a resiliently deformable polishing surface for following irregularities in the surface of an object to be polished.
12. A polishing wheel construction including a mounting plate member adapted to be supported on a drive shaft, a plurality of polishing circular members of fibrous material forming a polishing face, means for securing the inner and outer of said circular members to said mounting plate for providing relatively fixed circular members on said mounting plate, means for loosely retaining the other of said circular members as floating ring members extending a predetermined distance beyond the polishing face of said fixed circular members in position between said fixed circular members, resilient means for biasing said floating circular members in a direction away from said mounting plate member, and means secured to said mounting plate and arranged in engagement with said floating circular members for providing a driving connection between said floating circular members and said mounting plate.
GERALD S. FULLER-Q
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US556354A US2379141A (en) | 1944-09-29 | 1944-09-29 | Polishing wheel construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US556354A US2379141A (en) | 1944-09-29 | 1944-09-29 | Polishing wheel construction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2379141A true US2379141A (en) | 1945-06-26 |
Family
ID=24220993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US556354A Expired - Lifetime US2379141A (en) | 1944-09-29 | 1944-09-29 | Polishing wheel construction |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2379141A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2713757A (en) * | 1953-02-11 | 1955-07-26 | Tornado A G | Floor-finishing machine |
| US2826015A (en) * | 1954-08-12 | 1958-03-11 | Bisterfeld & Stolting | Rotary grinding wheels |
| US3067549A (en) * | 1959-08-08 | 1962-12-11 | Glaceries Sambre Sa | Glass polishing tools |
-
1944
- 1944-09-29 US US556354A patent/US2379141A/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2713757A (en) * | 1953-02-11 | 1955-07-26 | Tornado A G | Floor-finishing machine |
| US2826015A (en) * | 1954-08-12 | 1958-03-11 | Bisterfeld & Stolting | Rotary grinding wheels |
| US3067549A (en) * | 1959-08-08 | 1962-12-11 | Glaceries Sambre Sa | Glass polishing tools |
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