CA2243315A1 - Screwdriver - Google Patents
Screwdriver Download PDFInfo
- Publication number
- CA2243315A1 CA2243315A1 CA 2243315 CA2243315A CA2243315A1 CA 2243315 A1 CA2243315 A1 CA 2243315A1 CA 2243315 CA2243315 CA 2243315 CA 2243315 A CA2243315 A CA 2243315A CA 2243315 A1 CA2243315 A1 CA 2243315A1
- Authority
- CA
- Canada
- Prior art keywords
- contact zone
- clamping element
- screw
- screwdriver
- screwdriver according
- 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.)
- Abandoned
Links
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
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/02—Arrangements for handling screws or nuts
- B25B23/08—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation
- B25B23/10—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means
- B25B23/105—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means the gripping device being an integral part of the driving bit
- B25B23/108—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means the gripping device being an integral part of the driving bit the driving bit being a Philips type bit, an Allen type bit or a socket
-
- 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
- B25B15/008—Allen-type keys
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
A screwdriver with a tip which has a polygonal contact zone for insertion into the inner polygon of a screw, characterized therein that the contact zone (10, 18) has at least one clamping element (14, 16) which protrudes beyond the outer contour of the contact zone (10, 18) and which fits against the inner polygon of the screw in a force-locking manner when inserted into the screw under elastic working.
Description
Screwdriver The invention concerns a screwdriver according to the preamble of claim 1.
Screwdrivers of this type have a polygonal contact zone which is usually in the form of a hexagonal contact zone. The contact zone in socket screw wrenches is in the form of a polygonal cylinder and in ball end screwdrivers in the form of a polygonal ball. The screwdrivers can be furnished with a handle or be in the form of an offset screwdriver. It is also possible to make it in the form of a screwdriver insert which can be fitted into a screw tool.
In the known screwdrivers, the contact zone of the tip grips into the inner polygon of the screw with more or less little play. As a result, the screw does not have a f irm hold on the tip of the screwdriver which is disadvantageous when the screw has to be screwed in or out at a difficult-to-access location, so that it cannot also be held.
The object of the invention is to provide a screwdriver of the aforementioned type in which a screw can be held at the tip.
According to the invention, this object is solved by a screwdriver having the features of claim 1.
Advantageous embodiments and further developments of the invention are noted in the subclaims.
The basic idea of the invention lies therein that at least one clamping element be placed in the contact zone of the tip of the screwdriver which protrudes beyond the outer contour of the contact zone and fits against the inner polygon of the screw under elastic force. When inserting the tip of the screwdriver into the inner polygon of the screw, a frictional connection is established between the screwdriver and the screw by means of the clamping element, as a result of which the screw is held firmly at the tip of the screwdriver. The elastic flexibility of the clamping element thereby makes it possible to push the clamping element back against the outer contour of the contact zone and preferably into it. Thus, the clamping element does not hinder the form-locking engagement with slight play of the contact zone in the inner polygon of the screw which is necessary for a good torque transmission from the screwdriver to the screw.
To enable an engagement of the contact zone of the tip in the inner polygon of the screw which is as free of play as possible for an optimal torque transmission, the at least one clamping element is preferably situated in a recess of the surface of the contact zone.
As a result, the clamping element can be completely pushed into the recess, so that the form-locking and the torque transmission are not affected vis-a-vis conventional screwdrivers.
The clamping element can be made in various ways. It is essential that it protrudes beyond the surface of the contact zone of the tip to such an extent that it can fit against the inner polygon of the screw under elastic force and that it can be pushed back against the outer contour or into the outer contour of the contact zone to such an extent that it does not hinder an optimal form-locking of the contact zone with the inner polygon for the torque transmission.
Preferably, a synthetic material that is elastically compressible is used as clamping element. It is also possible to make the clamping element from an incompressible, elastically workable material, preferably of metal, whereby the working results in a turning aside of the clamping element into the outer contour of the contact zone. Finally, it is also possible to use a rigid clamping element which protrudes beyond the surface contour of the contact zone loaded by a spring and pressed into the surface contour by the force of the spring. Which design of the clamping element is preferred depends on the required clamping force, the required resistance to wear and on the required manufacturing costs.
The clamping elements may be in the form of point-like protrusions, e.g. in the form of plastic studs or spring-loaded balls.
Preferably, the clamping elements are made linear, as a result of which an improved form-locking connection can be produced. The linear clamping elements can thereby extend in peripheral direction or in axial direction. If clamping elements extending in axial direction are provided, then several linear clamping elements are preferably arranged at equal angular distances vis-~-vis one another, as a result of which a form-locking connection distributed uniformly over the periphery is produced as with clamping elements extending in peripheral direction.
The invention shall be described in greater detail in the following with reference to the embodiments illustrated in the drawings, showing Fig. 1 a first embodiment of the invention in a lateral view (a), a section along the line A-A (b), a view in direction B (c) and in a section along the line C-C, Fig. 2 a second embodiment of the invention in a lateral view (a), in a section along the line A-A (b) and in a section along the line B-B (c), Fig. 3 a representation corresponding to Fig. 2b of a third embodiment of the invention and Fig. 4 a fourth embodiment of the invention in a representation (a) corresponding to Figures ld and 2c and an enlarged detail (b).
The tip of a screwdriver is shown in Fig. 1, the contact zone of which is in the form of a hexagonal ball end 10.
Recesses 12 are worked into each of the six surfaces of the ball end 10, said recesses proceeding together from the front apex of the ball end 10 and extending in a straight line in axial direction, always in the centre of the hexagonal surfaces. The recesses 12 extend in axial direction up to the area of the ball end 10 with the largest diameter. Clamping elements which are in the form of plastic strands 14 are arranged in the recesses 12. As is shown especially in Figures lb and ld, the plastic strands 14 each have a somewhat circular cross-section, whereby one part of the cross-section of the plastic strands 14 lies in the recesses 12, while the other cross-sectional part protrudes beyond the surface contour of the ball end 10 with a measurement X. The length of the plastic strands 14 corresponds to the axial length of the recesses 12. The plastic strands 14 merge in the front apex.
Screwdrivers of this type have a polygonal contact zone which is usually in the form of a hexagonal contact zone. The contact zone in socket screw wrenches is in the form of a polygonal cylinder and in ball end screwdrivers in the form of a polygonal ball. The screwdrivers can be furnished with a handle or be in the form of an offset screwdriver. It is also possible to make it in the form of a screwdriver insert which can be fitted into a screw tool.
In the known screwdrivers, the contact zone of the tip grips into the inner polygon of the screw with more or less little play. As a result, the screw does not have a f irm hold on the tip of the screwdriver which is disadvantageous when the screw has to be screwed in or out at a difficult-to-access location, so that it cannot also be held.
The object of the invention is to provide a screwdriver of the aforementioned type in which a screw can be held at the tip.
According to the invention, this object is solved by a screwdriver having the features of claim 1.
Advantageous embodiments and further developments of the invention are noted in the subclaims.
The basic idea of the invention lies therein that at least one clamping element be placed in the contact zone of the tip of the screwdriver which protrudes beyond the outer contour of the contact zone and fits against the inner polygon of the screw under elastic force. When inserting the tip of the screwdriver into the inner polygon of the screw, a frictional connection is established between the screwdriver and the screw by means of the clamping element, as a result of which the screw is held firmly at the tip of the screwdriver. The elastic flexibility of the clamping element thereby makes it possible to push the clamping element back against the outer contour of the contact zone and preferably into it. Thus, the clamping element does not hinder the form-locking engagement with slight play of the contact zone in the inner polygon of the screw which is necessary for a good torque transmission from the screwdriver to the screw.
To enable an engagement of the contact zone of the tip in the inner polygon of the screw which is as free of play as possible for an optimal torque transmission, the at least one clamping element is preferably situated in a recess of the surface of the contact zone.
As a result, the clamping element can be completely pushed into the recess, so that the form-locking and the torque transmission are not affected vis-a-vis conventional screwdrivers.
The clamping element can be made in various ways. It is essential that it protrudes beyond the surface of the contact zone of the tip to such an extent that it can fit against the inner polygon of the screw under elastic force and that it can be pushed back against the outer contour or into the outer contour of the contact zone to such an extent that it does not hinder an optimal form-locking of the contact zone with the inner polygon for the torque transmission.
Preferably, a synthetic material that is elastically compressible is used as clamping element. It is also possible to make the clamping element from an incompressible, elastically workable material, preferably of metal, whereby the working results in a turning aside of the clamping element into the outer contour of the contact zone. Finally, it is also possible to use a rigid clamping element which protrudes beyond the surface contour of the contact zone loaded by a spring and pressed into the surface contour by the force of the spring. Which design of the clamping element is preferred depends on the required clamping force, the required resistance to wear and on the required manufacturing costs.
The clamping elements may be in the form of point-like protrusions, e.g. in the form of plastic studs or spring-loaded balls.
Preferably, the clamping elements are made linear, as a result of which an improved form-locking connection can be produced. The linear clamping elements can thereby extend in peripheral direction or in axial direction. If clamping elements extending in axial direction are provided, then several linear clamping elements are preferably arranged at equal angular distances vis-~-vis one another, as a result of which a form-locking connection distributed uniformly over the periphery is produced as with clamping elements extending in peripheral direction.
The invention shall be described in greater detail in the following with reference to the embodiments illustrated in the drawings, showing Fig. 1 a first embodiment of the invention in a lateral view (a), a section along the line A-A (b), a view in direction B (c) and in a section along the line C-C, Fig. 2 a second embodiment of the invention in a lateral view (a), in a section along the line A-A (b) and in a section along the line B-B (c), Fig. 3 a representation corresponding to Fig. 2b of a third embodiment of the invention and Fig. 4 a fourth embodiment of the invention in a representation (a) corresponding to Figures ld and 2c and an enlarged detail (b).
The tip of a screwdriver is shown in Fig. 1, the contact zone of which is in the form of a hexagonal ball end 10.
Recesses 12 are worked into each of the six surfaces of the ball end 10, said recesses proceeding together from the front apex of the ball end 10 and extending in a straight line in axial direction, always in the centre of the hexagonal surfaces. The recesses 12 extend in axial direction up to the area of the ball end 10 with the largest diameter. Clamping elements which are in the form of plastic strands 14 are arranged in the recesses 12. As is shown especially in Figures lb and ld, the plastic strands 14 each have a somewhat circular cross-section, whereby one part of the cross-section of the plastic strands 14 lies in the recesses 12, while the other cross-sectional part protrudes beyond the surface contour of the ball end 10 with a measurement X. The length of the plastic strands 14 corresponds to the axial length of the recesses 12. The plastic strands 14 merge in the front apex.
The plastic strands 14 consist of an elastically compressible synthetic material, e.g. of polyurethane or TPE (thermoplastic elastomers) or also of other elastic materials, such as e.g.
adhesives. The plastic strands 14 are applied by injection molding, vacuum molding or by immersing the ball end 10. The plastic strands 14 are held in the recesses 12 by contact adhesion.
It is also possible to make the recesses 12 with an undercut cross-section, so that the plastic strands 14 are also held in a form-closed manner.
The measurement X with which the plastic strands 14 protrude beyond the surface of the ball end 10 is somewhat greater than the play that remains between the surface of the ball end 10 and the inner hexagonal surface of the screw when the ball end 10 is inserted into the inner hexagon of a screw. When inserting the ball end 10 into the inner hexagon of the screw, the plastic strands 14 are then elastically pressed together and fit against the inner hexagonal surfaces of the screw under the action of their elastic restoring force. As a result, a tensional clamping results between the hexagonal ball end 10 and the screw by means of which the screw is held at the ball end 10. Since the plastic strands 14 can also be compressed into the recesses 12, the closed shape required for the torque transmission between the hexagonal ball end 10 and the inner hexagon of the screw is not affected by the plastic strands 14.
Fig. 2 shows a second embodiment of the invention with a hexagonal ball end 10.
In this embodiment, a recess 12 extends in peripheral direction of the ball end 10 in the area of the largest diameter of the ball end 10. The recess 12 may be made as a perforation in the ball end 10, so that the base of the recess 12 is circular in cross-section (Fig. 2b). A plastic strand 14 is inserted into the recess 12, the cross-section of said plastic strand being essentially circular.
The depth of the recess 12 and the diameter of the plastic strand 14 are adjusted to one another in such a way that the plastic strand 14 extends beyond the surface of the ball end 10 with a measurement X in the area of the hexagonal surfaces of the ball end 10, while the edges of the ball end 10 radially protrude for their part beyond the plastic strand 14.
In this case also, the plastic strand 14 may consist of a suitable elastomer material which is fastened in a self-holding, self-adhesive manner or by an adhesive and inserted into the recess 12 by injection molding, vacuum molding or immersion. In this embodiment, it is also possible to make the plastic strand 14 as a prefabricated O ring which is then mounted on the ball end 10 and lodges in the recess 12.
Fig. 3 shows a variation of the embodiment of Fig. 2. The ball end and the recess 12 correspond to the embodiment of Fig. 2.
However, in this case, a spring steel ring 16 is placed into the recess 12 as clamping element. The spring steel ring 16 is divided like a snap ring, so that it can be pressed together against a spring force while the diameter diminishes. The spring steel ring 16 may be made circular or may also be bent from a wire so as to have a wavy annular shape, as shown in Fig. 3. The spring steel ring 16 is dimensioned in such a way that it protrudes beyond the surface of the ball end by the measurement X in the area of the hexagonal surfaces of the ball end 10 when the tension is released, while it is within the surface contour in the area of the edges of 'the ball end 10.
It can be readily seen that the embodiment of Figures 2 and 3, in which the clamping element 14 or 16 is situated in a recess 12 extending in peripheral direction, cannot only be used in a tip whose contact zone is made in the form of a ball end, but also with a polygonal socket screw wrench whose contact zone is made in the form of a polygonal cylinder.
In the embodiments of Figures 2 and 3, the plastic strand 14 or the spring steel ring 16 is also pressed together in radial direction against an elastic restoring force when the ball end 10 (or the cylindrical contact zone) is inserted into the inner hexagon of a screw and fits against the inner surface of the inner hexagon of the screw so as to be form-locked under the action of the restoring force .
Fig. 4 shows a fourth embodiment of the invention in which the tip of the screwdriver has a hexagonal cylindrical contact zone 18.
In this embodiment, the recesses 12 are radially arranged in the plane front surface of the contact zone 18, as this corresponds to the representation in Fig. lc, and lead in axial direction, always in the centre in the hexagonal surfaces of the contact zones 18.
Plastic strands 14 made of an elastically compressible synthetic elastomer material are inserted into the recesses 12 which come together in the front surface in a star-shaped manner. The plastic strands 14 are concentrated in the axially extending sections of the recesses 12 in such a way that they protrude by a measurement X beyond beyond the surface of the lateral surfaces of the hexagon of the contact zone 18, as can be seen especially in Fig. 4b. The plastic strands 14 do not completely fill the axially extending sections of the recesses 12 up to their rear axial end, so that a displacement space 20 remains free in the recesses 12 between the axially rear end of the plastic strand 14 and the axially rear end of the recess 12, as can be seen in Fig. 4b. The axial length of the recesses 12 in the lateral surfaces of the contact zone 18 is shorter than the immersion depth Y with which the contact zone 18 sinks into the inner hexagon thereof when inserted into a screw.
If the tip of the screwdriver with the contact zone 18 is inserted into the inner hexagon of a screw, then the plastic strands 14 are elastically compressed in their areas protruding beyond the lateral surfaces of the contact zone 18 and are preferably pressed into the respective displacement spaces 20. Due to the elastic restoring force of the elastomer material of the plastic strands 14, they fit against the inner surfaces of the inner hexagon of the screw in a form-locking manner and hold them to the tip of the screwdriver.
Since the immersion depth Y of the contact zone 18 is greater than the axial length of the plastic strands 14, an area in which the hexagonal contact zone 18 engages positively with the inner hexagon of the screw without loss of torque is produced axially behind the plastic strands 14.
List of Reference Numbers Ball end 12 Recesses 14 Plastic strand 16 Spring steel ring 18 Cylindrical hexagon Displacement space X Protrusion measurement Y Immersion depth
adhesives. The plastic strands 14 are applied by injection molding, vacuum molding or by immersing the ball end 10. The plastic strands 14 are held in the recesses 12 by contact adhesion.
It is also possible to make the recesses 12 with an undercut cross-section, so that the plastic strands 14 are also held in a form-closed manner.
The measurement X with which the plastic strands 14 protrude beyond the surface of the ball end 10 is somewhat greater than the play that remains between the surface of the ball end 10 and the inner hexagonal surface of the screw when the ball end 10 is inserted into the inner hexagon of a screw. When inserting the ball end 10 into the inner hexagon of the screw, the plastic strands 14 are then elastically pressed together and fit against the inner hexagonal surfaces of the screw under the action of their elastic restoring force. As a result, a tensional clamping results between the hexagonal ball end 10 and the screw by means of which the screw is held at the ball end 10. Since the plastic strands 14 can also be compressed into the recesses 12, the closed shape required for the torque transmission between the hexagonal ball end 10 and the inner hexagon of the screw is not affected by the plastic strands 14.
Fig. 2 shows a second embodiment of the invention with a hexagonal ball end 10.
In this embodiment, a recess 12 extends in peripheral direction of the ball end 10 in the area of the largest diameter of the ball end 10. The recess 12 may be made as a perforation in the ball end 10, so that the base of the recess 12 is circular in cross-section (Fig. 2b). A plastic strand 14 is inserted into the recess 12, the cross-section of said plastic strand being essentially circular.
The depth of the recess 12 and the diameter of the plastic strand 14 are adjusted to one another in such a way that the plastic strand 14 extends beyond the surface of the ball end 10 with a measurement X in the area of the hexagonal surfaces of the ball end 10, while the edges of the ball end 10 radially protrude for their part beyond the plastic strand 14.
In this case also, the plastic strand 14 may consist of a suitable elastomer material which is fastened in a self-holding, self-adhesive manner or by an adhesive and inserted into the recess 12 by injection molding, vacuum molding or immersion. In this embodiment, it is also possible to make the plastic strand 14 as a prefabricated O ring which is then mounted on the ball end 10 and lodges in the recess 12.
Fig. 3 shows a variation of the embodiment of Fig. 2. The ball end and the recess 12 correspond to the embodiment of Fig. 2.
However, in this case, a spring steel ring 16 is placed into the recess 12 as clamping element. The spring steel ring 16 is divided like a snap ring, so that it can be pressed together against a spring force while the diameter diminishes. The spring steel ring 16 may be made circular or may also be bent from a wire so as to have a wavy annular shape, as shown in Fig. 3. The spring steel ring 16 is dimensioned in such a way that it protrudes beyond the surface of the ball end by the measurement X in the area of the hexagonal surfaces of the ball end 10 when the tension is released, while it is within the surface contour in the area of the edges of 'the ball end 10.
It can be readily seen that the embodiment of Figures 2 and 3, in which the clamping element 14 or 16 is situated in a recess 12 extending in peripheral direction, cannot only be used in a tip whose contact zone is made in the form of a ball end, but also with a polygonal socket screw wrench whose contact zone is made in the form of a polygonal cylinder.
In the embodiments of Figures 2 and 3, the plastic strand 14 or the spring steel ring 16 is also pressed together in radial direction against an elastic restoring force when the ball end 10 (or the cylindrical contact zone) is inserted into the inner hexagon of a screw and fits against the inner surface of the inner hexagon of the screw so as to be form-locked under the action of the restoring force .
Fig. 4 shows a fourth embodiment of the invention in which the tip of the screwdriver has a hexagonal cylindrical contact zone 18.
In this embodiment, the recesses 12 are radially arranged in the plane front surface of the contact zone 18, as this corresponds to the representation in Fig. lc, and lead in axial direction, always in the centre in the hexagonal surfaces of the contact zones 18.
Plastic strands 14 made of an elastically compressible synthetic elastomer material are inserted into the recesses 12 which come together in the front surface in a star-shaped manner. The plastic strands 14 are concentrated in the axially extending sections of the recesses 12 in such a way that they protrude by a measurement X beyond beyond the surface of the lateral surfaces of the hexagon of the contact zone 18, as can be seen especially in Fig. 4b. The plastic strands 14 do not completely fill the axially extending sections of the recesses 12 up to their rear axial end, so that a displacement space 20 remains free in the recesses 12 between the axially rear end of the plastic strand 14 and the axially rear end of the recess 12, as can be seen in Fig. 4b. The axial length of the recesses 12 in the lateral surfaces of the contact zone 18 is shorter than the immersion depth Y with which the contact zone 18 sinks into the inner hexagon thereof when inserted into a screw.
If the tip of the screwdriver with the contact zone 18 is inserted into the inner hexagon of a screw, then the plastic strands 14 are elastically compressed in their areas protruding beyond the lateral surfaces of the contact zone 18 and are preferably pressed into the respective displacement spaces 20. Due to the elastic restoring force of the elastomer material of the plastic strands 14, they fit against the inner surfaces of the inner hexagon of the screw in a form-locking manner and hold them to the tip of the screwdriver.
Since the immersion depth Y of the contact zone 18 is greater than the axial length of the plastic strands 14, an area in which the hexagonal contact zone 18 engages positively with the inner hexagon of the screw without loss of torque is produced axially behind the plastic strands 14.
List of Reference Numbers Ball end 12 Recesses 14 Plastic strand 16 Spring steel ring 18 Cylindrical hexagon Displacement space X Protrusion measurement Y Immersion depth
Claims (10)
1. A screwdriver with a tip which has a polygonal contact zone for insertion into the inner polygon of a screw, characterized therein that the contact zone (10, 18) has at least one clamping element (14, 16) which protrudes beyond the outer contour of the contact zone (10, 18) and which fits against the inner polygon of the screw in a force-locking manner when inserted into the screw under elastic working.
2. A screwdriver according to claim 1, characterized therein that the at least one clamping element (14, 16) is pushed aside at least partially into the outer contour of the contact zone (10, 18) under elastic working.
3. A screwdriver according to claim 1 or 2 , characterized therein that the at least one clamping element (14, 16) is situated in a recess (12) of the surface of the contact zone (10, 18).
4. A screwdriver according to one of the claims 1 to 3, characterized therein that the at least one clamping element (14, 16) is elongated and arranged in a linear manner on the surface of the contact zone (10, 18).
5. A screwdriver according to one of the claims 1 to 3, characterized therein that the at least one clamping element is arranged in point-form on the surface of the contact zone.
6. A screwdriver according to one of the claims 1 to 4, characterized therein that the at least one clamping element (14) extends at least partially in axial direction of the tip.
7. A screwdriver according to one of the claims 1 to 4, characterized therein that the at least one clamping element (14, 16) extends in peripheral direction of the tip.
8. A screwdriver according to one of the preceding claims, characterized therein that the at least one clamping element (14) consists of a synthetic elastomer material.
9. A screwdriver according to claim 8, characterized therein that the at least one clamping element (14) is fastened to the contact zone (10, 18) by adhesives, injection molding, vacuum molding, immersion or mounting.
10. A screwdriver according to claim 7, characterized therein that the at least one clamping element is a spring steel ring (16) situated in a recess (12) of the contact zone (10, 18) extending in peripheral direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2243315 CA2243315A1 (en) | 1998-07-16 | 1998-07-16 | Screwdriver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2243315 CA2243315A1 (en) | 1998-07-16 | 1998-07-16 | Screwdriver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2243315A1 true CA2243315A1 (en) | 2000-01-16 |
Family
ID=29409642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2243315 Abandoned CA2243315A1 (en) | 1998-07-16 | 1998-07-16 | Screwdriver |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2243315A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1512494A1 (en) * | 2003-09-05 | 2005-03-09 | Wiha Werkzeuge GmbH | Screwdriver |
| CN112571361A (en) * | 2020-12-21 | 2021-03-30 | 王翔 | Screw drapes over one's shoulders head self-lock device |
| CN112890944A (en) * | 2021-01-15 | 2021-06-04 | 宁波华科润生物科技有限公司 | Novel high-strength self-holding locking bolt screwdriver |
-
1998
- 1998-07-16 CA CA 2243315 patent/CA2243315A1/en not_active Abandoned
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1512494A1 (en) * | 2003-09-05 | 2005-03-09 | Wiha Werkzeuge GmbH | Screwdriver |
| WO2005032767A1 (en) * | 2003-09-05 | 2005-04-14 | Wiha Werkzeuge Gmbh | Screwdriver |
| CN112571361A (en) * | 2020-12-21 | 2021-03-30 | 王翔 | Screw drapes over one's shoulders head self-lock device |
| CN112890944A (en) * | 2021-01-15 | 2021-06-04 | 宁波华科润生物科技有限公司 | Novel high-strength self-holding locking bolt screwdriver |
| CN112890944B (en) * | 2021-01-15 | 2022-07-05 | 宁波华科润生物科技有限公司 | Self-holding locking bolt screwdriver |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |