CN103876433B - Screw holder and screwdriver working group locking device - Google Patents

Abstract

The present invention relates to a kind of screw holder, comprise the retainer that can be fixed on fixture on trunk and be connected to fixture, described retainer is provided with that several are separate, for keeping the screw retainer portions of single screw.In the arm that this screw holder is fixed on user by fixture or wrist, receive multiple screw by retainer, these screws are mutually isolated by screw retainer portions.The screw holder that screw is housed is fixed in the wrist of a hand, another hand is for gripping screwdriver, when needing load screw, screwdriver screwdriver bit is aimed at arbitrary piece of screw on retainer, screw operationally picks up by the screw pick device of screwdriver, whole screw loading procedure only needs the operation of a hand, and the hand be available then can be used for holding up device surely to be fixed all the time.The present invention relates to a kind of screwdriver working group locking device simultaneously.

Description

Screw holding device and screwdriver working combination device

Technical Field

The present invention relates to a screw retaining device.

The invention also relates to a screwdriver working combination device comprising the screw retaining device.

Background

In the current life style, people pay more and more attention to the comfort of the home and understand more and more to use the space to create the aesthetic feeling. Therefore, more and more devices are nailed on the wall surface, such as living goods, a liquid crystal television, a wall type air conditioner, a cosmetic mirror and a clock, and also some artistic pictures, calligraphy and painting works for mounting points and even mounted cross-stitch.

To complete the installation of these devices, a screwdriver and a screw are necessary tools. When using a screwdriver and screws for installation, users often encounter the following problems: after each screw is installed, a user needs to hold the screwdriver by one hand, free the other hand to draw a pocket, a tool bag or bend over to take off one screw, then place the taken screw into the installation hole of the device, and always hold the screw to prevent the screw from being bent in the screwing-in process. The process of loading and screwing the screw always requires the mutual participation of two hands of a user, which not only easily causes fatigue of the user, but also causes the device to be in a state without 'hands' in the process, especially the device which just completes the screw installation, and the device can be pulled to crack an installation hole or directly fall from a high place at any time due to the swinging caused by self weight.

The chinese patent application No. 201210272608.0 discloses an improved screwdriver, wherein a screw supporting device is provided at the front end of the working head of the screwdriver, the screwdriver can automatically clamp the screw by a certain abutting force of the screw, and can always provide stable support during the screwing process of the screw, the improved screwdriver frees one hand of a user during the screwing process of the screw, and the screw can be more stably and reliably mounted.

However, even with such an improved screwdriver, the loading process of the screw remains unaided by the other hand, as the user also needs to find the screw first and then abut it against the screwdriver bit. The prior art (japanese patent application JP2001314211A) discloses a magnetic wrist strap capable of attaching screws, which eliminates the trouble of a user bending down to take or draw a pocket or a tool bag to find the screws, but the screws are arranged askew and disorderly on the wrist strap, and the process of abutting the screwdriver bit and the screws cannot be assisted by the other hand.

In order to completely free one hand of the user, which can hold the component to be fixed, it is necessary to develop a device that simplifies the screw loading process, in particular a device for use with a screwdriver provided with screw holding means.

Disclosure of Invention

The invention aims to solve the technical problem of providing a screw retaining device, so that a screw placed in the screw retaining device is in a state to be loaded at any time, and the loading process from the screw to a screwdriver can be completed without the assistance of hands.

The technical scheme of the invention is as follows:

a screw holding device comprises a fixing piece capable of being fixed on the trunk of a human body and a holding frame connected with the fixing piece, wherein a plurality of mutually independent screw holding parts for holding single screws are arranged on the holding frame.

The beneficial effect after this scheme is implemented does: the screw retaining device is fixed on the trunk of the user body, such as arms, wrists, thighs and waists, through fixing pieces, and a plurality of screws are received by a retainer and are separated from each other through screw retaining parts. For example, the screw holding device with the screw is fixed on the wrist of one hand, the other hand is used for holding a screwdriver, when the screw needs to be loaded, the screwdriver head is aligned with any screw in the holding frame, the screw picking device of the screwdriver can pick up the screw, the whole screw loading process only needs to be operated by one hand, and the hand used for fixing the screw holding device can always hold the device to be fixed.

Preferably, the screw retaining portion is configured as a plurality of receiving cavities distributed within the retainer. The accommodating cavities are independent from each other, and the position state of the screw can be well maintained.

Preferably, one end of the accommodating cavity is provided with an opening, and the other end of the accommodating cavity is provided with a blind hole. The accommodating cavity is arranged in an inwards concave blind hole mode, and provides a supporting function for screws accommodated in the accommodating cavity while providing an accommodating space.

Preferably, the depth of the accommodating cavity is at least 2 mm. Such degree of depth setting guarantees on the one hand to accept the chamber and can accomodate the screw of various not unidimensional, and on the other hand makes the nut portion of screw expose all the time again, is convenient for picking up of screw.

Preferably, the retainer is further provided with a limiting piece for limiting the movement of the screw in the accommodating cavity. The arrangement of the limiting part limits the displacement and the shaking of the screw in the accommodating cavity, so that the consequence that the accommodating cavity is expanded to be incapable of holding the screw is avoided.

Preferably, the limiting member has magnetism, and is at least partially in contact with the accommodating cavity, and the screw placed in the accommodating cavity is attracted by the limiting member. The screw is ferrous and the magnetic retainer helps the screw retaining portion to secure the screw.

Preferably, the screw retaining portions are evenly distributed on the holder. The screw retaining parts which are arranged orderly enable the structure of the screw retaining device to be compact and the appearance to be attractive.

Preferably, the holder has a hexahedral configuration in which screw retaining portions are distributed on at least one face. The hexahedron has simple and practical structure and is convenient to process.

Preferably, the retainer has a hemispherical configuration, the screw retaining portion is disposed on the spherical surface and extends toward the center of the sphere, and an extension line of the screw retaining portion passes through the center of the sphere of the retainer. The arrangement enables the holder to fix the most screws, and the screws are convenient to take and use.

Preferably, the surface of the holder contacting the human body is a curved surface. The surface of the retainer, which is in contact with the human body, is a curved surface, so that the wearing comfort is ensured, and the screw retaining device is also favorably fixed at a specific position of the human body to prevent the screw retaining device from moving.

Preferably, the fixing member is a band member fixable to an arm or a wrist. Is fixed on the upper limb, especially the arm or the wrist, accords with the operation habit of the user, and is simple and convenient.

Another technical problem to be solved by the present invention is to provide a screwdriver working assembly, by which a user can complete the loading and mounting work of a screw with one hand, thereby ensuring that the user has a free hand for holding the device to be fixed all the time.

The screw batch working combination device comprises a screw batch, wherein the screw batch is provided with a batch head and a screw pickup device connected to the screw batch in an adapting mode, the screw batch working combination device further comprises the screw retaining device, and when the batch head abuts against a nut part of any screw in the screw retaining device, the screw pickup device can pick up the screw in an operating mode.

The beneficial effect after the implementation of above-mentioned scheme is: the screwdriver capable of picking the screw is matched with the screw retaining device, when the screwdriver head abuts against the screw in the screw retaining device, the screw picking device is operable to pick the screw, so that the screw is separated from the screw retaining device, and the loading of the screw is completed. The whole loading process can be finished by a single hand, so that the other hand of the user can always stably hold the device to be fixed.

Drawings

Fig. 1 is a perspective view of a screw retaining device in a preferred embodiment of the present invention.

Fig. 2 is a cross-sectional view of the screw retaining device of fig. 1.

Fig. 3 is a perspective view of a screw retaining device in a second embodiment of the present invention.

Fig. 4 is a perspective view of a screw retaining device in a third embodiment of the present invention.

FIG. 5 is a perspective view of a screwdriver in the screwdriver working assembly of the present invention.

Fig. 6 is a schematic view of the screwdriver of fig. 5 in a screw loaded state.

Fig. 7 is a schematic view of the screwdriver of fig. 5 engaged with the screw retaining device of the first embodiment to perform screw loading.

Fig. 8 is a schematic view of the screwdriver of fig. 5 engaged with the screw retaining device of the second embodiment to perform screw loading.

Wherein,

1. screw retaining device 3, fixing piece 5, holder

7. Accommodating cavity 9, magnet 11 and magnetic conductive sheet

13. Screw 13a, nut portion 13b, and screw portion

15. Screw driver 17, shell 19 and handle

21. Bit 23, holding piece 25, shell

27. Abutting mechanism 29, supporting mechanism 31, switch

X, axis 51. curved surface

Detailed Description

The invention discloses a screw holding device and also discloses a screwdriver with a screw picking device, wherein the screw holding device is matched with the screwdriver for use, so that the workload of a user in the process of loading screws can be greatly reduced, and the damage or falling of a device to be fixed caused by the fact that the user is busy searching and supporting the screws can be avoided. The invention is further described below with reference to the accompanying drawings.

Referring to fig. 1, the screw retaining device 1 includes a fixing member 3 and a retainer 5 fixed to the fixing member 3. The fixing member 3 may be fixed to the torso of the human body, for example, between the waist, around the thigh, or even around the neck, and in this embodiment, the fixing member 3 is a band fixed to the arm or wrist. The fixing member 3 is made of an elastic rubber material, so that the circumference of the fixing member 3 can bear a certain degree of tension, thereby facilitating the wearing and taking-off of a user. Of course, the fixing member 3 may be made of leather or fiber material, or made of metal bracelet similar to a watch, and the hasps with adjustable joint circumferences are arranged at the two ends of the fixing member 3, so as to provide the most comfortable wearing mode for users with different body types. Of course, the fixing member 3 may also be made of plastic or other materials, and the manner of adjusting the circumference of the fixing member 3 may be various, and will not be described in detail here.

In the present embodiment, both ends of the mount 3 are inserted through mounting holes (not shown) on both side surfaces of the holder 5, respectively, and the holder 5 is fixed to the mount 3. Of course, the fixing member 3 may also extend through the mounting hole at the bottom of the holder 5, and those skilled in the art can also find many ways to fix the holder 5 to the fixing member, which will not be described herein.

Referring to fig. 1, in the first embodiment relating to the holder 5, the holder 5 has a substantially regular hexahedral shape in which two rows of screw holding portions for receiving the screws 13 are provided on one surface. The screw retaining portions are configured as receiving cavities 7 distributed in the holder 5, the receiving cavities 7 having an opening at one end flush with the surface of the holder 5 and being provided as blind holes at the other end. The blind hole provides a certain degree of support for the screw 13, and provides a reaction force for the screw 13 during the loading process of the screw 13, especially when the nut portion 13a is collided, so as to assist the screw 13 to be finally picked up by the screw picking device, and as to the loading process of the screw 13, the details will be omitted. The accommodating cavity 7 has a certain depth and a certain width, and can be used for accommodating screws 13 of different specifications, and simultaneously, the nut part 13a of the screw 13 is ensured to be always higher than the surface of the opening, so that the screw 13 can be conveniently taken and used, and the screw 13 can be in a loaded state at any time. Preferably, the depth of the housing 7 is at least 2mm, so that even the smallest sized screws 13 can be received therein. Of course, the depth of the accommodating cavities 7 can be different, and a plurality of accommodating cavities 7 with the same depth can be arranged on the same holder 5, so as to meet the requirement of a large number of screws 13 with the same specification; the holder 5 can also be provided with a plurality of accommodating cavities 7 with different depths so as to meet the requirements of users on screws 13 with different specifications when finishing comprehensive work.

Of course, the inner wall of the receiving cavity 7 may be worn along with frequent insertion and extraction of the screw 13, which results in that the width thereof is continuously enlarged, which is not beneficial to fixing the screw 13, and therefore, the invention provides a limiting member for limiting the movement of the screw 13 in the receiving cavity 7. Referring to fig. 1 and 2, the limiting member includes two magnetic conductive sheets 11 and a magnet block 9, the two magnetic conductive sheets 11 are oppositely disposed and respectively externally tangent to the outer walls of the two rows of accommodating cavities 7, the magnetic conductive sheets 11 are iron sheets or other magnetic conductive metal sheets, and the magnet block 9 respectively transmits magnetism to the inner walls of the two rows of accommodating cavities 7 through the magnetic conductive sheets 11 contacting with the magnet block, so that at least a part of a screw 13 made of an iron material in the accommodating cavity 7 is tightly attached to the inner walls of the accommodating cavities 7, thereby helping the accommodating cavities 7 to hold the screw 13 and limiting the screw 13 from shaking or shifting. Of course, the limiting member may be a magnet block 9 extending lengthwise and circumscribing the outer walls of all the accommodating cavities 7, or only include two magnetic conductive sheets 11 made of permanent magnetic material.

Of course, the position limiting element is not limited to the above-mentioned manner of attracting by magnetism, and may also be configured to have the function of releasably clamping the screw 13 by disposing an elastic sheet in the accommodating cavity 7, and may also be configured to have a cavity of the accommodating cavity 7 made of an elastic material, so that the inner wall of the accommodating cavity 7 is always kept elastic, thereby facilitating the clamping and the taking out of the screw 13. Of course, other embodiments for helping the housing chamber 7 to hold the screw 13 are also conceivable by those skilled in the art and will not be described in detail here.

In the first embodiment, the storage cavities 7 are arranged in two rows on one surface of the holder 5 in order, and are independent from each other without interference, but the arrangement of the storage cavities 7 is not limited to this. Referring to fig. 3, in the second embodiment of the screw retaining device 1, the receiving cavities 7 are distributed on two opposite surfaces, and when the screws 13 on the surface convenient for use are taken out, the user can take the fixing member 3 off and change the direction to wear the fixing member again, so that the screws 13 on the other surface are in a position convenient for loading.

Referring to fig. 4, in order to carry a larger number of screws 13 at a time, the shape of the holder 5 may be configured as a hemisphere in the third embodiment, and the arrangement of the receiving cavities 7 is uniformly dispersed along the hemisphere, that is, the receiving cavities 7 extend toward the center of the holder 5, and the extension line of the receiving cavities 7 passes through the center of the holder 5.

Of course, the shape of the holder 5 and the arrangement of the receiving cavities 7 are not limited to the three embodiments described above, and those skilled in the art can easily conceive of other alternative shapes and arrangements, which are not listed here. It is worth mentioning that in order to improve the discomfort of the user when wearing the screw retaining device and to better fix the screw retaining device to a certain part of the body, the surface of the retainer 5 that contacts the body part is particularly made as a curved surface 51. As shown in fig. 1, the bottom surface of the retainer 5 is a curved surface 51 with a certain curvature, which can adapt to the shape of the wrist or arm skeleton of the user, so that the retainer 5 is more stably held on one position of the arm or wrist, and the screw 13 is prevented from being rapidly loaded due to rotation.

In the above-described embodiments, the screw holding portion is in the form of the receiving cavity 7, each receiving cavity 7 receives one screw 13 individually, and the receiving cavities 7 are spaced apart from each other by a distance such that the screws 13 do not interfere with each other, and each screw 13 is in an upright and easy-to-take state. Of course, the screw retaining portion may be of another construction, such as a clamp made of a recoverable material, or other conceivable construction; in summary, the function of the screw retaining portion is to provide stable support for the single screw 13 and to enable the screw 13 to be in an upright position ready to be loaded, and as for the specific structure, a person skilled in the art can easily conceive of many embodiments, which will not be described herein.

In summary, the screw holding device 1 is adjustably fixed to the wrist or arm of the user so that the screw 13 housed therein always assumes an upright and easy-to-take state. Of course, the screw holding device 1 of the present invention is used in combination with a screwdriver 15 provided with a screw picking device to maximize the advantages of the screw holding device 1, and the following description is briefly made of the screwdriver 15 capable of automatically clamping the screw 13.

According to different power sources, the screwdriver can be divided into a manual screwdriver, a pneumatic screwdriver, a hydraulic screwdriver and an electric screwdriver, and the electric screwdriver also has a direct current and an alternating current.

Referring to fig. 5 and 6, the dc electric screwdriver 15 includes a housing 17, and the housing 17 is assembled by folding two symmetrical half shells with screws (not shown), and a battery (not shown), a motor (not shown), a transmission mechanism (not shown), and an output shaft (not shown) are disposed therein. The housing 17 has a horizontal portion and a portion of the handle 19 disposed at an obtuse angle to the horizontal portion, preferably between 100 and 130 degrees in the present invention, so that the handle 19 can be comfortably held for operation. A push button switch 31 is provided at the upper portion of the handle 19 portion, the battery is fixed to the rear portion of the handle 19 portion, and the transmission mechanism portion is fixedly received in the horizontal portion of the housing 17. As a preferred embodiment, the battery may be a lithium ion battery. It should be noted that the lithium ion battery referred to herein is a generic term of a rechargeable battery in which a negative electrode material is a lithium element, and may be constructed in many systems, such as a "lithium manganese" battery, a "lithium iron" battery, and the like, depending on a positive electrode material. In the present embodiment, the lithium ion battery is a lithium ion battery having a rated voltage of 3.6V (volts). Of course, the battery 6 may also be of a nickel cadmium, nickel hydrogen, or the like, of a type well known to those skilled in the art.

The screw picking device in the invention is preferably exemplified by a screw supporting device, the screw supporting device can be integrated with a screwdriver, and can also be used as a screwdriver accessory which is convenient to assemble and disassemble, and the screw supporting device shown in the embodiment is a fixing component of the screwdriver. Referring to fig. 5 and 6, the screw supporting device mainly includes a housing 25 coupled to the screwdriver 15, an abutting mechanism 27 for abutting the screw 13, a supporting mechanism 29 for supporting the screw 13, and a driving mechanism (not shown) for driving the supporting mechanism 29 to support the screw 13. The bits 21 are part of an abutment mechanism 27 and the holding mechanism 29 comprises a plurality of holding members 23 which hold the screws 13 from different directions. This has the advantage that the screw 13 can be held in a number of different orientations so that the screw 13 does not tilt during driving into a workpiece. The number of the rests 23 is at least two and the rests 23 are circumferentially uniformly arranged about the axis X. So that the resultant of the action of the plurality of buttresses 23 is directly on the screw 13 located on the axis X. If the number of the handpieces 23 is 2, the two handpieces 23 are exactly symmetrical about the axis X; if the number of the supports 23 is 3, the three supports 23 are located exactly on the three vertices of an equilateral triangle, with the axis X passing through the center of the equilateral triangle; and so on. In the present embodiment, the number of the supporters 23 is 2. When the bit 21 contacts the nut portion 13a of the screw 13, whether a force is applied from the nut portion 13a toward the bit 21 or the bit 21 presses against the nut portion 13a and receives a reaction force of the screw 13, the contact of the two triggers the movement of the driving mechanism inside the housing 25, and the movement of the driving mechanism directly causes the 2 holding members 23 to be folded toward the axis X from a direction away from the axis X under the action of the principle of leverage, thereby clamping the screw portion 13b of the screw 13. As to the specific structure inside the screw supporting device and the mutual matching relationship among the mechanisms, reference may be made to the chinese patent application No. 201210272608.0, which is entitled "screw supporting device and screw tool for assembling the screw supporting device" and will not be further described here.

Referring to fig. 7, the screwdriver working combination device of the present invention comprises the screw holding device 1 and the screwdriver 15 provided with the screw supporting device. When the screwdriver 15 and the screw retaining device 1 are used in cooperation, the screwdriver and the screw retaining device 1 are respectively positioned on the left arm and the right arm of a user, namely, the user wears the screw retaining device 1 on one wrist (or arm) and holds the screwdriver 15 with the other hand. Assuming that the user is familiar with performing more complex actions with the right hand, the screw retaining device 1 is located on the user's left wrist, as shown in fig. 8, while the screwdriver 15 is held by the user's right hand. (of course, the user can simply choose to wear the screw retaining device 1 on the right wrist with his left hand holding the screwdriver 15 according to his own operating habits.) since the screws 13 in the screw retaining device 1 are all in an "upright" position, the user's left hand can be maintained in a stable workpiece position without having to "touch the east and west" when the user has performed the installation of one screw 13 and needs to reload the screw 13. When loading the screw 13, the user only needs to bring the screwdriver 15 held by the right hand close to the left arm (or the left wrist) to make the screwdriver head 21 of the screwdriver 15 touch the nut portion 13a of any one of the screws 13, so that no matter the right hand slightly applies force to the left screwdriver 13 or the left wrist slightly applies force to the right screwdriver head 21, the movement of the screw holding device on the screwdriver 15 can be immediately triggered, and the holding member 23 tightly "holds" the screw portion 13b of the screw 13. After the screw portion 13b is "held" by the screwdriver 15, the user moves the right hand away from the left wrist, and the "held" screw 13 is gradually released from the screw holding device 1, and the following screw 13 driving work is performed together with the screwdriver 15. The screw driver 15 also has a function of stabilizing the screw 13 during the driving of the screw 13 and a function of automatically loosening the screw 13 after the screw 13 is driven to a certain depth, so that the reader can look at the specification of the chinese patent application No. 201210272608.0, namely the screw supporting device and the screw tool for assembling the screw supporting device, which is not described in detail herein.

In summary, the above-mentioned screwdriver 15 has the functions of automatically clamping the screw 13, stabilizing the screw 13 and loosening the screw 13 when appropriate, and the functions of stabilizing the screw 13 and loosening the screw 13 make the screwdriver play a great role in the installation process of any screw 13, so that the workload of the user is reduced, the risks of finger injury and the like possibly caused by the supporting of the screw 13 are avoided, and the screwdriver is also beneficial to the user to always stabilize the device to be processed in the installation process of the screw 13. However, if the screw holding device 1 of the present invention is absent, the process of "loading" the screw 13 is still tedious even with such a modified screwdriver 15, because without such a screw holding device 1, which can free one hand, the process of loading the screw 13 cannot be freed from the assistance of the other hand, whereas the problems or concerns described in the background art are difficult to avoid as long as the other hand is involved in the loading process.

In other words, the screw retaining device 1 described above provides a user with a convenient storage and access for screws, and the screw retaining device 1 not only "tacitly" cooperates with the screwdriver 15 having a screw clamping device, but also is suitable for use with a strong magnetic screwdriver (not shown). In the strong magnetic screwdriver, the screw pick-up device is a magnet arranged at the rear end of the screwdriver head, and the magnet conducts magnetism to the iron screwdriver head, so that the screwdriver head also has strong magnetism. Thus, when the magnetic bit comes into contact with the screw in the screw retaining device, the ferrous screw is immediately attracted by the magnetic bit, thereby being carried away from the screw retaining device during movement of the screw batch by the user, completing the loading of the screw into the screw batch.

Of course, in addition to the two types of screwdriver with screw pick-up means described above, the screw-holding device 1 has an unparalleled advancement even when used with a conventional screwdriver 15, the only difference being that the screw-holding device 1 needs to be worn on the wrist of the hand used to hold the screwdriver 15 when the user is using the conventional screwdriver 15. Of course, the screw holding device 1 is most preferably used in combination with the screwdriver 15 to form the screwdriver working combination device of the present invention, so that the user can easily understand the difficulties and troubles encountered in the conventional loading and installing processes of the screw 13.

The above definitions of the various elements are not limited to the various specific configurations or shapes mentioned in the embodiments, and may be easily and commonly replaced by those skilled in the art.

It will be appreciated by those skilled in the art that the invention can be implemented in other ways, provided that the technical spirit of the invention is the same as or similar to the invention, or that any changes and substitutions based on the invention are within the protection scope of the invention.

Claims (9)

1. A screw retaining device comprises a fixing piece which can be fixed on a human body trunk and a retainer connected to the fixing piece, and is characterized in that: the retainer is provided with a plurality of mutually independent screw retaining parts for retaining a single screw, the screw retaining parts are constructed into a plurality of accommodating cavities distributed in the retainer, one end of each accommodating cavity is provided with an opening, the other end of each accommodating cavity is provided with a blind hole, and the blind hole can provide axial supporting force for the screw accommodated in the accommodating cavity.

2. The screw retaining device of claim 1, wherein: the depth of the accommodating cavity is at least 2 mm.

3. The screw retaining device of claim 1, wherein: the retainer is also provided with a limiting piece for limiting the screw to move in the accommodating cavity.

4. The screw retaining device of claim 3, wherein: the limiting piece is magnetic and at least partially contacts with the accommodating cavity, and a screw placed in the accommodating cavity is attracted by the limiting piece.

5. The screw retaining device of claim 1, wherein: the retainer has a hexahedral configuration, in which screw retaining portions are distributed on at least one face.

6. The screw retaining device of claim 1, wherein: the retainer has a hemispherical configuration, the screw retaining part is distributed on the spherical surface and extends towards the spherical center direction, and the extension line of the screw retaining part passes through the spherical center of the retainer.

7. The screw retaining device of claim 1, wherein: the surface of the retainer contacting with the human body is a curved surface.

8. The screw retaining device of claim 1, wherein: the fixing piece is a belt-shaped piece capable of being fixed on an arm or a wrist.

9. The utility model provides a screwdriver work composite set, includes the screwdriver, the screwdriver is equipped with criticizes the head and connects the screw pickup assembly who connects on the screwdriver which characterized in that: the screw driver assembly further comprising a screw retaining device according to any one of claims 1 to 8, said screw pick-up device being operable to pick up a screw when the driver head abuts the nut portion of any one of the screws in the screw retaining device.