GB212919A - Improvements in machines for automatic production of twist drills - Google Patents
Improvements in machines for automatic production of twist drillsInfo
- Publication number
- GB212919A GB212919A GB6273/24A GB627324A GB212919A GB 212919 A GB212919 A GB 212919A GB 6273/24 A GB6273/24 A GB 6273/24A GB 627324 A GB627324 A GB 627324A GB 212919 A GB212919 A GB 212919A
- Authority
- GB
- United Kingdom
- Prior art keywords
- clutch
- spindle
- wheel
- lever
- pinion
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
- B23C3/28—Grooving workpieces
- B23C3/32—Milling helical grooves, e.g. in making twist-drills
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling And Boring (AREA)
Abstract
212,919. Wingfield, B. R., (Assignee of Riemenschneider, F.). March 13, 1923, [Convention date]. Addition to 195,648. Shaping helical surfaces.- The machine described in the parenti Specification is provided with modified means for driving the work spindle and for positively returning the tool slides on completion of a drill. A shaft 74 driven through bevel gearing from a shaft 72 carries two crank-discs 76, 77 whose crank-pins, 180‹ apart, are connected to wheels 80, 81 which are loose on a shaft 123 and engage loose pinions 82, 83 on the work spindle 19. The pinions 82, 83 are provided with clutch teeth coacting with teeth on a double clutch sleeve 86 driving the work spindle. The stroke of the drive of the pinions 82, 83 may be varied by adjusting the crank-pins. During the cutting operation the clutch is held in engagement with the pinion 82 by means of a lever 90 coacting with a projection on the clutch-operating lever 92. At the end of the cutting operation a rack 103 engaging a wheel 111 on the tool-feeding spindle 5, is moved slightly backward by contact with an abutment 109 whereupon a tappet 104 on the rack acts through lever mechanism to disengage the lever 90. The clutch sleeve 86 is then shifted by a spring 98 to engage the pinion 83 so that the backward motion of the spindle is continued to take up a fresh blank. During this long backward movement the rack 103 is also returned by the abutment 109, thus actuating the wheel 111 on the spindle 5 to return the 'tools to their starting position. To permit this movement a clutch 120 between the feed ratchet wheel 11 and the spindle 5 is disengaged by means of a lever 117 which is actuated by a spring when, on completion of a work piece, a pin 118 drops into a notch on a disc 119 connected to the feed wheel. At the end of the forward movement produced by the wheel 81 a cam 121 thereon re-engages the clutch 86 with the pinion 82 for a fresh series of cutting operations.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE212919X | 1923-03-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB212919A true GB212919A (en) | 1924-09-25 |
Family
ID=5810569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB6273/24A Expired GB212919A (en) | 1923-03-13 | 1924-03-11 | Improvements in machines for automatic production of twist drills |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB212919A (en) |
-
1924
- 1924-03-11 GB GB6273/24A patent/GB212919A/en not_active Expired
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