GB2548247A - Screwdriver - Google Patents
Screwdriver Download PDFInfo
- Publication number
- GB2548247A GB2548247A GB1703902.5A GB201703902A GB2548247A GB 2548247 A GB2548247 A GB 2548247A GB 201703902 A GB201703902 A GB 201703902A GB 2548247 A GB2548247 A GB 2548247A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sleeve
- screwdriver
- proximal end
- stock
- shaft
- 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.)
- Withdrawn
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
- B25B15/00—Screwdrivers
- B25B15/02—Screwdrivers operated by rotating the handle
-
- 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
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
-
- 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
- B25B23/101—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means for hand-driven screw-drivers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
The screwdriver comprises a manually grippable handle or stock 2 having mounted thereto an elongate screwdriver shaft 3 having a screw-engaging tip 4; a slidable axial sleeve 6 fitted coaxially around the shaft, the sleeve having a distal end shaped for engagement with a screw head and a proximal end to fit in the handle, the proximal end having an enlarged flange 8a. The handle has a blind socket 9 in the stock for receiving the shaft and the proximal end of the sleeve, in which the blind socket having a constriction at the open end of the blind socket for engaging the enlarged flange; and a spring 11 located in the blind socket to engage the proximal end of the sleeve and to bias the sleeve away from the stock. The sleeve may comprise a unitary integral extrusion and be constructed from plastic or metal. The sleeve may be axially symmetrical and substantially cylindrical.
Description
Screwdriver
The present invention concerns a screwdriver, which may be of the traditional manual type, or may be a motor-powered type. In particular, the invention concerns a screwdriver adapted to inhibit unwanted movement of its tip relative to the head of a driven screw.
Although screwdrivers (both manual and motor-powered) for driving a wood screws or the like have been known for many years, and they are probably the most ubiquitous of hand tools, they nevertheless have some disadvantages. Specifically, unwanted movement of the tip of the screwdriver relative to the head of a screw to be driven remains a significant problem. Such unwanted movement (which is generally lateral movement in the case of slot-headed screws) can result in the tip of the screwdriver slipping out of the head of the wood screw. Such slipping is especially problematical when the head of the screw is not readily accessible, or when the workpiece into which the screw is being inserted is subject to vibration. Such unwanted movement can cause damage to the head of the screw, to the workpiece into which the screw is being screwed, and/or to fingers of the operative.
Proposals have been made to provide tubular sleeves for the shafts of screwdrivers with ends of the tubular sleeves intended to engage with the outer edge of the screw head, in order to inhibit such unwanted movement. Examples of such disclosures are given in, for example, US patents 4800788 and 5029498, and GB2251196A1. Such sleeves are all intended to be retrofit to existing manual screwdrivers, which has the disadvantage that they must be sufficiently flexible to slide over the widest part of the screwdriver shaft (shank) - namely the tip, but then fit sufficiently snugly that they do not slide back over the tip when the screwdriver is in use.
According to the invention, there is provided a screwdriver comprising (a) a manually grippable stock having mounted thereto an elongate screwdriver shaft a screw-engaging tip; (b) a slidable axial sleeve fitted coaxially around the elongate shaft, the sleeve having (i) a distal open end dimensioned for encircling the periphery of a screw head, (ii) a proximal end to fit in the stock, the proximal end having an enlarged flange and (iii) a tubular sleeve extending from the distal end to the proximal end and encircling the shaft; (c) a blind socket in the stock for receiving the shaft and the proximal end of the sleeve, the blind socket having a constriction at the open end of the blind socket for engaging the enlarged flange; and (d) resilient biasing means provided in the blind socket for engaging the proximal end of the sleeve to bias the sleeve away from the stock.
The invention is described in the accompanying claims.
The screwdriver according to the invention therefore includes a freely slidable sleeve with a distal end to engage with a screw head (such engagement being preferably by encircling the periphery of the screw head). The sleeve is biased by the resilient biasing means towards the screw so that the distal end of the sleeve snugly fits to the screw head and thereby prevents unwanted lateral movement of the screw when the latter is driven by the screwdriver. Typically the head of the screw may fit into the distal end of the sleeve to a depth of up to about 3 millimetres.
The sleeve is therefore resiliently biased to fit around the screw head; user pressure on the screwdriver can cause the sleeve to retract slightly, typically to a depth of about 8 millimetres. This is therefore advantageous when the screwdriver is used to drive countersunk screws.
The resiliently biased sleeve advantageously helps to grip the screw and to prevent lateral movement of the screwdriver tip relative to the screw thread, thereby preventing damage to the screw or workpiece, or personal injury to the user.
The sleeve may, in one embodiment, comprise a tube of plastics material, typically of an engineering plastics material such as polypropylene, high density polyethylene, polyamide (nylon) or the like. In this embodiment, it is particularly, preferred that such a tube be in the form of an unitary integral extrusion. Such a tube is preferably such that it has flexibility in a transverse direction (so that it can grip around the head of the screw when in use) but not in a longitudinal direction (so that it can be biased by the biasing means substantially without compression).
In an alternative embodiment, the sleeve may comprise a tube of engineering metal, such as aluminium. Such a metal tube should again be substantially rigid in a longitudinal direction.
The sleeve in the screwdriver according to the invention is generally axially symmetrical, and furthermore generally substantially cylindrical (apart from the enlarged flange) so that the sleeve has a circular opening at the distal end to engage with the screw head. The enlarged flange is shaped to engage with an internal lip in the blind socket, such that the sleeve is maintained in place (that is, not fully pushed out of the blind socket) when the sleeve is biased by the resilient biasing means.
The sleeve should be of sufficient length to be able to surround the entire exposed length of the screwdriver shaft when biased outwardly to the full extent by the biasing means, leaving the proximal end and the enlarged flange in the blind socket. When the sleeve is pressed from the distal end, the proximal end may retract into the blind socket against the action of the resilient biasing means.
The resilient biasing means typically comprise a helical spring arranged for engagement with the enlarged flange at the proximal end of the sleeve to bias the sleeve away from the stock.
Other suitable resilient biasing means include shaped elastomeric bodies or other forms of spring.
When the resilient biasing means is a helical spring, it preferably fits around the elongate screwdriver shaft (or shank) with one end of the helical spring engaging the closed end of the blind socket and the other end engaging the proximal end of the sleeve (such as the enlarged flange thereof).
The constriction at the open end of the blind socket is preferably annular, and shaped and dimensioned to engage with a corresponding annular enlarged flange of the sleeve. Such as annular constriction typically coaxially surrounds the elongate screwdriver shaft.
The elongate screwdriver shaft is preferably of conventional tool metal construction (for example of tool grade steel). The tip is shaped to engage with a corresponding shape in the screw head. For example, when the screw is of the slot-head type, the screwdriver has a straight tip. Alternatively, when the screw is of the cross-head (or Philips) type, then the screwdriver has a complementary shaped cross-head tip.
Generally the screwdriver shaft has a portion thereof extending from the tip that is of circular cross-section; the proximal end (that is the end mounted to the stock) typically has flat sides or conventional projections for secure anti-rotation engagement with the stock.
The stock may be of conventional form for a manual screwdriver, such as a moulded body of suitable high impact plastics or elastomeric material, moulded around the proximal end of the screwdriver shaft (and with the blind socket moulded as an integral part of the stock).
Alternatively, the screwdriver shaft may be removable from and replaceable to the stock, in which case the stock is preferably provided with a motor for driving the screwdriver shaft, so as to provide a power-driven screwdriver. Such a power-driven screwdriver preferably has a chuck to enable different screwdriver shafts to be inserted or replaced; the stock is generally provided with a trigger so that the user can selectively cause the motor to either drive the screw in or out. A power-driven screwdriver of this nature may have impact-driver bits. A preferred embodiment of the invention will now be described with reference to the accompanying drawing of which the single figure is a schematic view of an exemplary screwdriver according to the invention.
Specifically, the drawing shows a manual screwdriver 1 having a manually grippable stock 2 which receives an elongate screwdriver shaft 3 having a screw-engaging tip 4, and within the stock, protrusions 5a, 5b for keying to the material of the stock 2. A slidable axial flexible sleeve 6 fits coaxially around the shaft 3. The sleeve 6 has a circular open end 7 for engagement with a screw head (not shown) and an opposed end 8 having an enlarged flange 8a. The sleeve is as shown substantially cylindrical apart from the enlarged flange 8a.
End 8 is received in a blind socket 9 in the stock, the blind socket having a constriction 10 at the open end thereof for engaging the enlarged flange 8a. A helical spring 11 (which coaxially surrounds shaft 3) is provided in the blind socket for engaging the end of the sleeve 6 to the bias away from the stock. The sleeve therefore covers the entire exposed length of the shaft 3 under the biasing action of the spring; when pressure is put on the end 7 of the sleeve 3, the sleeve will partially retract into the socket 9 against the action of the spring 11. A screwdriver according to the invention (such as the embodiment just described) may be used with any conventional screws, such as wood screws, or screws for fitting to metal or to other materials (such as masonry). The screws may be countersunk, flat head, domed or any other conventional type of screw.
Claims (9)
1. A screwdriver comprising (e) a manually grippable stock having mounted thereto an elongate screwdriver shaft a screw-engaging tip; (f) a slidable axial sleeve fitted coaxially around the elongate shaft, the sleeve having (i) a distal open end dimensioned for encircling the periphery of a screw head, (ii) a proximal end to fit in the stock, the proximal end having an enlarged flange and (iii) a tubular sleeve extending from the distal end to the proximal end and encircling the shaft; (g) a blind socket in the stock for receiving the shaft and the proximal end of the sleeve, the blind socket having a constriction at the open end of the blind socket for engaging the enlarged flange; and (h) resilient biasing means provided in the blind socket for engaging the proximal end of the sleeve to bias the sleeve away from the stock.
2. A screwdriver according to claim 1, wherein the tubular sleeve is of plastics material.
3. A screwdriver according to claim 2, wherein the tubular sleeve comprises a unitary integral extrusion.
4. A screwdriver according to claim 1, wherein the tubular sleeve is of engineering metal.
5. A screwdriver according to any of claims 1 to 4, wherein the tubular sleeve is axially symmetrical, and substantially cylindrical.
6. A screwdriver according to any of claims 1 to 5, wherein the resilient biasing means comprise a helical spring arranged for engagement with the enlarged flange at the proximal end of the sleeve to bias the sleeve away from the stock.
7. A screwdriver according to claim 6, wherein the helical spring fits around the elongate screwdriver shaft with one end of the helical spring engaging the closed end of the blind socket and the other end engaging the proximal end of the sleeve.
8. A screwdriver according to any of claims 1 to 7, wherein the constriction at the open end of the blind socket is annular, and shaped and dimensioned to engage with a corresponding annular enlarged flange of the sleeve.
9. A screwdriver according to claim 8, wherein the annular constriction coaxially surrounds the elongate screwdriver shaft.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1604128.7A GB2548142A (en) | 2016-03-10 | 2016-03-10 | Screwdriver |
Publications (2)
Publication Number | Publication Date |
---|---|
GB201703902D0 GB201703902D0 (en) | 2017-04-26 |
GB2548247A true GB2548247A (en) | 2017-09-13 |
Family
ID=55952145
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1604128.7A Withdrawn GB2548142A (en) | 2016-03-10 | 2016-03-10 | Screwdriver |
GB1703902.5A Withdrawn GB2548247A (en) | 2016-03-10 | 2017-03-10 | Screwdriver |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1604128.7A Withdrawn GB2548142A (en) | 2016-03-10 | 2016-03-10 | Screwdriver |
Country Status (1)
Country | Link |
---|---|
GB (2) | GB2548142A (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1687788A (en) * | 1925-11-03 | 1928-10-16 | Abraham S Pinkus | Screw driver |
US2302691A (en) * | 1940-08-16 | 1942-11-24 | Edgar B Green | Combination screw driver and retrieving tool |
DE2508983A1 (en) * | 1975-03-01 | 1976-09-09 | Gill Fa Willi | Screwdriver with screw grip - has spring loaded grip sleeve which slides on shaft concentric to drive blade |
US4763548A (en) * | 1985-11-06 | 1988-08-16 | Oswald Leibinger Gmbh | Screwdriver, particularly for surgical purposes |
US20080041196A1 (en) * | 2006-08-16 | 2008-02-21 | Warsaw Orthopedic Inc. | Surgical Screw Insertion Devices and Methods of Use |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3601129A1 (en) * | 1986-01-16 | 1987-07-30 | Egon Voswinkel | SCREWDRIVER |
-
2016
- 2016-03-10 GB GB1604128.7A patent/GB2548142A/en not_active Withdrawn
-
2017
- 2017-03-10 GB GB1703902.5A patent/GB2548247A/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1687788A (en) * | 1925-11-03 | 1928-10-16 | Abraham S Pinkus | Screw driver |
US2302691A (en) * | 1940-08-16 | 1942-11-24 | Edgar B Green | Combination screw driver and retrieving tool |
DE2508983A1 (en) * | 1975-03-01 | 1976-09-09 | Gill Fa Willi | Screwdriver with screw grip - has spring loaded grip sleeve which slides on shaft concentric to drive blade |
US4763548A (en) * | 1985-11-06 | 1988-08-16 | Oswald Leibinger Gmbh | Screwdriver, particularly for surgical purposes |
US20080041196A1 (en) * | 2006-08-16 | 2008-02-21 | Warsaw Orthopedic Inc. | Surgical Screw Insertion Devices and Methods of Use |
Also Published As
Publication number | Publication date |
---|---|
GB201703902D0 (en) | 2017-04-26 |
GB201604128D0 (en) | 2016-04-27 |
GB2548142A (en) | 2017-09-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |