US1418975A - Tool for grinding watch crystals - Google Patents
Tool for grinding watch crystals Download PDFInfo
- Publication number
- US1418975A US1418975A US407631A US40763120A US1418975A US 1418975 A US1418975 A US 1418975A US 407631 A US407631 A US 407631A US 40763120 A US40763120 A US 40763120A US 1418975 A US1418975 A US 1418975A
- Authority
- US
- United States
- Prior art keywords
- tool
- grinding
- watch
- watch crystals
- plate
- 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
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D15/00—Hand tools or other devices for non-rotary grinding, polishing, or stropping
- B24D15/02—Hand tools or other devices for non-rotary grinding, polishing, or stropping rigid; with rigidly-supported operative surface
- B24D15/023—Hand tools or other devices for non-rotary grinding, polishing, or stropping rigid; with rigidly-supported operative surface using in exchangeable arrangement a layer of flexible material
-
- G—PHYSICS
- G04—HOROLOGY
- G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
- G04D3/00—Watchmakers' or watch-repairers' machines or tools for working materials
- G04D3/06—Devices for shaping or setting watch glasses
- G04D3/065—Shaping by removing material, e.g. cutting out from a plate, milling the edges
Definitions
- This invention while relating generally to grinding and polishing machines and tools, has more particular reference to a simple tool for grinding watch crystals.
- the object of my invention is to provide a very simple file for watch crystals which obviates the use of a lathe, and which has the advantage of speed in use.
- the invention resides in a tool for the purpose described, characterized by the provision of a backplate, removably carrying clamping members for a plurality of superposed sandpaper strips disposed upon said back-plate,- and securely held by said clamping members in use.
- Figure 1 is a View in perspective of the tool of my invention
- FIG. 2 is a fragmentary view in sideeleration thereof
- Figure 3 is a fragmentary View in bottom plan
- Figure e is a detached detail View in perspective of one of the clamping members.
- a base or back-plate, which may be of any preferred length for convenient manipulation by the operator.
- Said plate is provided with two apertures 2, 2, through each. of which projects a stem 3, carried by a clamping member l, the latter being preferably constructed as a plate having angled terminals 5, 5, one of said terminals being adapted, in use, to bear against the base plate 1, and the other of the terminals against a plurality of superposed sand-paper sheets, or strips, 6.
- each stem 3 is exteriorly threaded, as shown at 7, for the reception of a wing-nut 8, which is screwed upon said threaded extremity to clamp the plate 1 against the sand-paper 6, a washer 9 being interposed between the nut 8 and the base pate l.
- the parts are assembled as shown in Figures 1, 2 and 3- with the clamping members 4, a tightly holding the sandpaper 6 against the base plate 1, and the tool is used by reciprocating the same against the watch crystal.
- the sand-paper 6, used in connection with my tool is very line, so that the glass of the watch crystal will not be chipped, as is the result when the common steel file, used by many operators, is utilized.
- My tool, using fine sand-paper also leaves the edge of the crystal so smooth that it is not noticeable when it has been ground down. I have found by experiment that it is advisable to use about ten strips of sandpaper in connection with the tool, and when one strip of paper begins to stop cutting, the same is torn off and the user of the tool has another good surface.
- a hand bufier comprising a back plate for 10 a threaded extension integral with the plate and projecting through the opening in the back plate, said opening being sufficiently large to permit the positive gripping of a maximum or minimum number of abrasive strips by its coacting bent portion, and a ing nut in threaded engagement with the threaded extension.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Description
I w. M. SANDEFUR. TOOL FOR GRINDING WATCH CRYSTALS.
APPLICATION FILED SEPT. 2, I920.
Patented June 6, 1922.
lull
OFFICE.
TOOL FOR GRINDING WATCH CRYSTALS.
' Specification of Letters Patent.
Patented June 6, 1922.
Application filed September 2, 1820. Serial No. 407,631.
such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.
This invention, while relating generally to grinding and polishing machines and tools, has more particular reference to a simple tool for grinding watch crystals.
Almost all tools for this purpose on the market are rather expensive and slow in operation, since practically all are lathe attachments. In fitting crystals it is necessary to try the same in the watch bezels at short intervals when grinding them down, since there is very little difference between a crystal that fits and one that is a trifle too small. Therefore, in order to do this with lathe machines, the operator has to take the glass out of the lathe machine and try the same in the watch bezel, and put it back in the lathe again, which requires time to recenter.
The object of my invention is to provide a very simple file for watch crystals which obviates the use of a lathe, and which has the advantage of speed in use.
With this object in view, the invention resides in a tool for the purpose described, characterized by the provision of a backplate, removably carrying clamping members for a plurality of superposed sandpaper strips disposed upon said back-plate,- and securely held by said clamping members in use.
The accompanying drawing clearly discloses the preferred form of my invention, although it is to be understood that I do not desire to be restricted thereto, since changes may be made within the scope of the appended claim without departing from the spirit of the invention, or necessarily sacrificing any of its advantages. Briefly described:
Figure 1 is a View in perspective of the tool of my invention;
Figure 2 is a fragmentary view in sideeleration thereof,
Figure 3 is a fragmentary View in bottom plan, and
Figure e is a detached detail View in perspective of one of the clamping members.
Referring now in detail to the drawing:
1 designates a base, or back-plate, which may be of any preferred length for convenient manipulation by the operator. Said plate is provided with two apertures 2, 2, through each. of which projects a stem 3, carried by a clamping member l, the latter being preferably constructed as a plate having angled terminals 5, 5, one of said terminals being adapted, in use, to bear against the base plate 1, and the other of the terminals against a plurality of superposed sand-paper sheets, or strips, 6. The termi nal of each stem 3 is exteriorly threaded, as shown at 7, for the reception of a wing-nut 8, which is screwed upon said threaded extremity to clamp the plate 1 against the sand-paper 6, a washer 9 being interposed between the nut 8 and the base pate l.
In operation, the parts are assembled as shown in Figures 1, 2 and 3- with the clamping members 4, a tightly holding the sandpaper 6 against the base plate 1, and the tool is used by reciprocating the same against the watch crystal. The sand-paper 6, used in connection with my tool, is very line, so that the glass of the watch crystal will not be chipped, as is the result when the common steel file, used by many operators, is utilized. My tool, using fine sand-paper, also leaves the edge of the crystal so smooth that it is not noticeable when it has been ground down. I have found by experiment that it is advisable to use about ten strips of sandpaper in connection with the tool, and when one strip of paper begins to stop cutting, the same is torn off and the user of the tool has another good surface.
I have also found, in operation, that by the use of a plurality of superposed sandpaper strips, I obtain a cushioning effect which makes the tool out much faster and more evenly.
Having thus described my invention, the many advantages thereof will be apparent, especially to those skilled in the art to which it pertains.
lVhat I claim to be new and upon which I desire to obtain Letters Patent is:
A hand bufier comprising a back plate for 10 a threaded extension integral with the plate and projecting through the opening in the back plate, said opening being sufficiently large to permit the positive gripping of a maximum or minimum number of abrasive strips by its coacting bent portion, and a ing nut in threaded engagement with the threaded extension.
In testimony whereof I hereunto a'tfix my signature.
WILLIAM MALLOVV SANDEFUR.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US407631A US1418975A (en) | 1920-09-02 | 1920-09-02 | Tool for grinding watch crystals |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US407631A US1418975A (en) | 1920-09-02 | 1920-09-02 | Tool for grinding watch crystals |
Publications (1)
Publication Number | Publication Date |
---|---|
US1418975A true US1418975A (en) | 1922-06-06 |
Family
ID=23612866
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US407631A Expired - Lifetime US1418975A (en) | 1920-09-02 | 1920-09-02 | Tool for grinding watch crystals |
Country Status (1)
Country | Link |
---|---|
US (1) | US1418975A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2489005A (en) * | 1947-12-01 | 1949-11-22 | Constantine C Bourdunis | Sander device |
-
1920
- 1920-09-02 US US407631A patent/US1418975A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2489005A (en) * | 1947-12-01 | 1949-11-22 | Constantine C Bourdunis | Sander device |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2052837A (en) | Grinding device | |
US2597421A (en) | Abrading unit | |
US2417680A (en) | Sanding pad | |
US1418975A (en) | Tool for grinding watch crystals | |
US684142A (en) | Device for holding photographic prints while being cut. | |
US4078338A (en) | Graver sharpening apparatus | |
US2114757A (en) | Tool holding and sharpening device | |
US3173206A (en) | Bladed implement | |
US2362306A (en) | Grinding gauge or holder for thread-cutting tools | |
US2066381A (en) | Disk tool | |
US2864210A (en) | Device for sharpening and jointing knives on a jointer, shaper and the like | |
US2148156A (en) | Combined parallel work support and clamp | |
US1201515A (en) | Glass-cutter. | |
US2067179A (en) | Saw sharpener | |
US1801802A (en) | Cutlery sharpener | |
US1647203A (en) | Tool-grinding machine | |
US2120500A (en) | Blade holder | |
US2336043A (en) | Mandrel for honing machines | |
US1416366A (en) | Grinder fixture | |
US1883286A (en) | Abrasive carrier for cylinder grinding tools | |
US2395598A (en) | Radius and angle dresser | |
US2144901A (en) | Profiling diamond | |
US2161994A (en) | Disk cutter | |
GB805790A (en) | Improvements in and relating to hand tools for abrasive and similar action | |
US128957A (en) | Improvement in sharpeners for harvester-knives |