EP0453976A1 - Lame de tournevis - Google Patents
Lame de tournevis Download PDFInfo
- Publication number
- EP0453976A1 EP0453976A1 EP91106288A EP91106288A EP0453976A1 EP 0453976 A1 EP0453976 A1 EP 0453976A1 EP 91106288 A EP91106288 A EP 91106288A EP 91106288 A EP91106288 A EP 91106288A EP 0453976 A1 EP0453976 A1 EP 0453976A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- screwdriver
- screw
- width
- profile
- 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.)
- Granted
Links
Images
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
- B25B15/007—Screwdrivers characterised by material or shape of the tool bit characterised by cross-section with blade of flat or substantially flat cross-section
Definitions
- the present invention relates to a screwdriver blade.
- an M 1.2 screw (metric thread with an outer thread diameter of 1.2 mm), be it for a cylinder screw, countersunk screw, raised countersunk screw, etc., has a screw head slot width of 0.3 mm; on the other hand an M 12 screw has a slot width of 3 mm.
- the force transmission between the screwdriver and the slot should be optimal when the screw is screwed in and loosened, and the screw heads should not be slashed out after a few uses, a whole set of no less than 11 individually graduated screwdrivers, which are marked according to VSM with the sizes 00-9.
- the invention seeks to remedy this.
- the invention as characterized in the claims, is based on the object of providing a screwdriver blade whose blade geometry is capable of capturing a maximized range of screw sizes. It is a further object of the invention to optimally apply force when twisting and to ensure when loosening the recorded screw sizes.
- the main advantage of the invention can be seen in the fact that at least the slotted-head screws with a thread diameter of M1.2 - M 12 can be screwed in and loosened with a single screwdriver blade, i.e. a single screwdriver can, however, increase the screw size on which this is based non-conclusive range, to replace 11 different screwdrivers, i.e. the VSM sizes 00-9, without having to do without optimal force transmission during the threading process and loosening the screws.
- Another advantage of the invention can be seen in the fact that the geometrical configuration of the blade shape of the screwdriver blade makes the feared slipping out of the slot shape impossible, in particular when screwing in with hand screwdrivers.
- a further advantage of the invention results from the possibility that the screws can be slipped onto the screwdriver blade for a winding in hard-to-reach places, with which it is possible to carry out such a winding without the usual known magnetic or mechanical aids.
- screwdriver blade can be used both in conventional hand-held screwdrivers with a handle part and also as an insert in the various designs of torque screwdrivers.
- FIG. 1 shows an extract from a standard sheet for screws S with a metric thread.
- the screws considered here have a cylinder head with a diameter a1 and a slot with a width of n.
- the characteristic values were taken from the standard sheet VSM 13159 and cover, for example, the area between the screws M1.6 to M10. It is known that this standard sheet is based on other continental European standards, for example the DIN standards, which is why it cannot be expected that country-specific screwdrivers should be provided. Nevertheless, in the near future a uniform European standard can be expected anyway in the context of a closer EC merger. If, according to the task, a screwdriver blade is to be proposed that is able to grasp the entire area ai, i.e.
- the respective slot width is from 0.4 mm to 2.5 mm extends, on the other hand, that the screw head diameter a1 of the associated screws is between 3 mm and 16 mm. Accordingly, a screwdriver equipped with such a blade must have a shovel shape which can be used with both a slot width of 0.4 mm and a slot width of 2.5 mm, taking into account the different cylinder head diameters, such that that the twisting and loosening of the respective screws in the specified area does not damage and / or fray the original Cause slot geometry and prevents slipping out of the slot shape.
- FIG. 3 shows the holistic profile shape of a screwdriver shovel, based on the determined profile shape according to FIG. 2.
- the rectangular central part A is determined in each case according to the smallest screw to be detected, ie according to its slot width n and screw head diameter a1:
- the central part is whose blade geometry has a thickness A2 of 0.4 mm and a width A1 of 3 mm, intended for an M 1.6 screw.
- the thickening following this middle part in both directions of the X and Y planes B1 and B2 of the profile shape of the screwdriver shovel is based on the determined course according to FIG. 2 and is intended for an M 10 screw with a greatest thickness F of 2.5 mm and a greatest width E of 16 mm (cf. 1).
- FIG. 4 shows a further development of the subject matter of the invention, which is designed to provide a one-sided straight blade surface in order to allow the all-round point or line force introduction between the screwdriver blade and the slot shape, as is the case with a shape of the screwdriver blade according to FIG. 3 is expected to get around.
- the detection of the remaining screws of the underlying area is done by a V-shaped thickening C1 and C2, which starts from the central part A, opposite to the straight blade surface.
- the rhomboid profile surfaces of the thickenings C1 and C2 have a constant directional coefficient, which is 17.9 degrees in terms of angle for the underlying area, and is therefore steeper than is still the case with the design according to FIG. 3.
- the shape of the blade of the screwdriver blade according to FIGS. 3 and 4 can also be a convex / concave, respectively. describe convex course.
- Such a measure on the embodiment according to FIG. 4, as can be seen in FIG. 5, has great advantages when it is particularly easy to wind screws in poorly accessible places. This is done in the present case, as shown in FIG. 5, by displacing the screw S laterally against one of the thickenings D1 or D2 and then pressing it there against the convex edge in such a way that a light, self-supporting connection between the screwdriver blade and the screw S results .
- the average angle of the convexity corresponds to the directional coefficient of the course of the curve according to FIG. 4, which indicates the usability of a allows such a screwdriver blade over the entire intended screw area, such a blade not being weakened in terms of material for the lower screw area, for example for an M 1.6 screw.
- screwdrivers can be provided for a narrower range than the above-described screw spectrum, that is, for the size range 00-9, for example, 2 or 3 screwdriver blades can be used.
- FIG. 6 and 7 show a three-dimensional representation of a screwdriver blade 1 according to the shovel shape according to FIG. 4, the blade being shown in use in FIG. 7, as is intended to symbolize the position of the screw S.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Drilling Tools (AREA)
- Connection Of Plates (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1380/90 | 1990-04-24 | ||
| CH1380/90A CH683078A5 (de) | 1990-04-24 | 1990-04-24 | Schraubenzieherklinge. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0453976A1 true EP0453976A1 (fr) | 1991-10-30 |
| EP0453976B1 EP0453976B1 (fr) | 1995-11-15 |
Family
ID=4209080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91106288A Expired - Lifetime EP0453976B1 (fr) | 1990-04-24 | 1991-04-19 | Lame de tournevis |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0453976B1 (fr) |
| AT (1) | ATE130235T1 (fr) |
| CH (1) | CH683078A5 (fr) |
| DE (1) | DE59106883D1 (fr) |
| DK (1) | DK0453976T3 (fr) |
| ES (1) | ES2080850T3 (fr) |
| GR (1) | GR3018699T3 (fr) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994009281A1 (fr) * | 1992-10-20 | 1994-04-28 | Baker David R | Lame de tournevis et vis a surfaces curvilignes |
| GB2386854A (en) * | 2002-02-16 | 2003-10-01 | Steven Broadbelt | Diamond Drive Screwdriver System |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR440585A (fr) * | 1911-06-16 | 1912-07-13 | Alfred H Eicken | Tournevis à lame double concave |
| GB101151A (fr) * | 1915-08-12 | 1917-03-29 | Henry Cole William | |
| US1476653A (en) * | 1922-05-17 | 1923-12-04 | Joseph R Stanton | Screw driver |
| US4016912A (en) * | 1975-12-15 | 1977-04-12 | St Amour Lionel | Screwdriver for slotted head screw |
| US4680995A (en) * | 1986-02-24 | 1987-07-21 | Naphs, Inc. | Screwdriver |
-
1990
- 1990-04-24 CH CH1380/90A patent/CH683078A5/de not_active IP Right Cessation
-
1991
- 1991-04-19 AT AT91106288T patent/ATE130235T1/de not_active IP Right Cessation
- 1991-04-19 DK DK91106288.3T patent/DK0453976T3/da active
- 1991-04-19 DE DE59106883T patent/DE59106883D1/de not_active Expired - Fee Related
- 1991-04-19 ES ES91106288T patent/ES2080850T3/es not_active Expired - Lifetime
- 1991-04-19 EP EP91106288A patent/EP0453976B1/fr not_active Expired - Lifetime
-
1996
- 1996-01-17 GR GR960400100T patent/GR3018699T3/el unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR440585A (fr) * | 1911-06-16 | 1912-07-13 | Alfred H Eicken | Tournevis à lame double concave |
| GB101151A (fr) * | 1915-08-12 | 1917-03-29 | Henry Cole William | |
| US1476653A (en) * | 1922-05-17 | 1923-12-04 | Joseph R Stanton | Screw driver |
| US4016912A (en) * | 1975-12-15 | 1977-04-12 | St Amour Lionel | Screwdriver for slotted head screw |
| US4680995A (en) * | 1986-02-24 | 1987-07-21 | Naphs, Inc. | Screwdriver |
Non-Patent Citations (1)
| Title |
|---|
| IBM Technical Disclosure Bulletin vol. 31, Jan. 1989, No. 8, p. 1 "Integrated bi-blade screwdriwer" * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994009281A1 (fr) * | 1992-10-20 | 1994-04-28 | Baker David R | Lame de tournevis et vis a surfaces curvilignes |
| GB2386854A (en) * | 2002-02-16 | 2003-10-01 | Steven Broadbelt | Diamond Drive Screwdriver System |
Also Published As
| Publication number | Publication date |
|---|---|
| CH683078A5 (de) | 1994-01-14 |
| ES2080850T3 (es) | 1996-02-16 |
| DK0453976T3 (da) | 1996-04-09 |
| DE59106883D1 (de) | 1995-12-21 |
| GR3018699T3 (en) | 1996-04-30 |
| ATE130235T1 (de) | 1995-12-15 |
| EP0453976B1 (fr) | 1995-11-15 |
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