GB673303A - Improvements in or relating to screw drivers and their manufacture - Google Patents
Improvements in or relating to screw drivers and their manufactureInfo
- Publication number
- GB673303A GB673303A GB1742050A GB1742050A GB673303A GB 673303 A GB673303 A GB 673303A GB 1742050 A GB1742050 A GB 1742050A GB 1742050 A GB1742050 A GB 1742050A GB 673303 A GB673303 A GB 673303A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screw
- recess
- bar
- cavity
- tapered
- 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
- 238000004519 manufacturing process Methods 0.000 title 1
- 238000005242 forging Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B15/00—Screwdrivers
- B25B15/001—Screwdrivers characterised by material or shape of the tool bit
- B25B15/004—Screwdrivers characterised by material or shape of the tool bit characterised by cross-section
- B25B15/005—Screwdrivers characterised by material or shape of the tool bit characterised by cross-section with cross- or star-shaped cross-section
Abstract
673,303. Making hand tools. GUEST, KEEN & NETTLEFOLDS (MIDLANDS), Ltd. July 12, 1950, No. 17420/50. Classes 83 (ii) and 83 (iv). [Also in Group XXIII] Forging.-A screw-driver for a screw having a generally conical recess with a central cavity 13, Fig. 2, and radial slots 14, is made by forcing the tapered end of a cruciform section bar, Fig. 6, into a die 30, Fig. 5, having a cavity 31 substantially the same as the recess in the screw. The end of the bar is first tapered by grinding &c. to form end faces 24, 25 at angles corresponding to the shape of the bottom of the recess. The bar is then forced while cold into the die cavity 31 which may be slightly deeper than the screw recess and has an aperture 32 at the bottom for the escape of excess metal. The formed shank is finally hardened by heat treatment and secured in a handle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1742050A GB673303A (en) | 1950-07-12 | 1950-07-12 | Improvements in or relating to screw drivers and their manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1742050A GB673303A (en) | 1950-07-12 | 1950-07-12 | Improvements in or relating to screw drivers and their manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB673303A true GB673303A (en) | 1952-06-04 |
Family
ID=10094891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1742050A Expired GB673303A (en) | 1950-07-12 | 1950-07-12 | Improvements in or relating to screw drivers and their manufacture |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB673303A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2895295A1 (en) * | 2005-12-23 | 2007-06-29 | Black & Decker Inc | Cross threaded screwdriver bit for e.g. piercing reception hole, has coaxial piercing point situated inside tapered cover revolution surface forming angle with respect to axis of bit, where angle is greater than angle that forms end sides |
| EP2529889A1 (en) * | 2010-01-28 | 2012-12-05 | Katsuyuki Totsu | Screwdriver bit |
-
1950
- 1950-07-12 GB GB1742050A patent/GB673303A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2895295A1 (en) * | 2005-12-23 | 2007-06-29 | Black & Decker Inc | Cross threaded screwdriver bit for e.g. piercing reception hole, has coaxial piercing point situated inside tapered cover revolution surface forming angle with respect to axis of bit, where angle is greater than angle that forms end sides |
| EP2529889A1 (en) * | 2010-01-28 | 2012-12-05 | Katsuyuki Totsu | Screwdriver bit |
| EP2529889A4 (en) * | 2010-01-28 | 2017-05-03 | Katsuyuki Totsu | Screwdriver bit |
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