TECHNICAL FIELD

[0001] The invention relates generally to a storage device and, more particularly, to a storage device that enables a large variety of different items of similar size to be stored in a portable container and to be readily selectable for retrieval and use.

BACKGROUND

[0002] It is common to have a large number of small items that must be stored in some manner. Such small items may include, by way of example, but not limitation, artist charcoal/pencils, children's crayons, drill bits, taps (for cutting threads), bobbins for sewing, spices, gauge pins, screwdriver bits, fishing weights, and the like. Often, small items are all stored together in a large bin, but it then becomes difficult to identify and retrieve any particular item. In other instances, a small box or drawer will be devoted to each item, but that often results in an inefficient use of space.

[0003] A screwdriver represents a particular case in point wherein a person may need a number of different screwdrivers to perform a task. This is particularly problematic, time consuming, and even dangerous, when such person is working on a ladder and must continually go up and down the ladder to fetch different screwdrivers. For such cases, screwdrivers are available which hold a number of different bits selectable by a user; such screwdrivers are referred to as multi-bit screwdrivers. There are, however, a number of drawbacks associated with "multi-bit" screwdrivers. The most common drawback is that such screwdrivers typically require two hands to change a bit, which can be dangerous when, for example, a user is standing atop a high ladder. Another common drawback is that the number of bits is very limited, such as six or even fewer bits. A still further drawback is that bits can be dropped or lost during handling.

[0004] In view of the foregoing, there is a need for a storage device that enables a large variety of different items of similar size to be readily stored and retrieved in a portable container and to be readily selectable for use. It would be desirable in one application for such a storage device to be adapted to a multi-bit screwdriver in a way which would allow the screwdriver to be operable with a single hand, to carry a sufficient number of bits to be useful in a large number of applications, and wherein the bits are secured and loaded within the screwdriver. PATENT

SUMMARY

[0005] The present invention, accordingly, provides a storage device for managing the storage and retrieval of items for delivery to a point of use. Accordingly, the storage device includes at least one cartridge defining a cavity for receiving at least one storage item. A receiver defines at least one cell for receiving the at least one cartridge, and a passageway extending longitudinally along the center of the receiver to an opening in an external surface of the receiver. Magnets are secured to the receiver and the at least one cartridge for magnetically biasing the at least one cartridge in a first position in the at least one cell wherein the cavity is not aligned with the passageway, and in a second position in the at least one cell wherein the cavity is aligned with the passageway.

[0006] In one application of the invention, the storage device is configured as a portion of a handle in a multi-bit screwdriver having a tubular shaft extending from the handle. The screwdriver is configured for enabling a user to select a bit and pass it through the handle and tubular shaft to an end of the shaft for use in tightening and loosening fasteners, such as screws. A ratchet mechanism is preferably positioned between the handle and the shaft for selectively controlling the direction of rotation in which the handle turns the shaft and bit.

[0007] The foregoing has outlined rather broadly the features and technical advantages of the present invention in order that the detailed description of the invention that follows may be better understood. Additional features and advantages of the invention will be described hereinafter which form the subject of the claims of the invention. It should be appreciated by those skilled in the art that the conception and the specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present invention. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the invention as set forth in the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

[0008] For a more complete understanding of the present invention, and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:

[0009] FIGURE 1 is a perspective view of a storage device embodying features of the present invention; PATENT

[0010] FIGURE 1A is a perspective view of a screwdriver embodying features of the storage device of FIG. 1 and further of the present invention;

[0011] FIGURES 2A-2D exemplify a bit adapted for use with the screwdriver of FIG. 1A;

[0012] FIGURE 3A is a cross-section of the screwdriver of the invention taken along line 3-3 of FIG. 1A;

[0013] FIGURE 3B is a cross-section of the screwdriver of the invention taken along line 3B-3B of FIG. 3 A;

[0014] FIGURE 3C is a cross-section of the screwdriver of the invention taken along line 3C-3C of FIG. 3 A;

[0015] FIGURE 3D is a cross-section of the screwdriver of the invention taken along line 3-3 of FIG. 1A;

[0016] FIGURES 4-7 exemplify various views of a cartridge adapted for holding a bit for use in a screwdriver of the invention;

[0017] FIGURES 8A-8D exemplify various states of cartridges positioned in a handle and taken along line 8-8 of FIG. 3D;

[0018] FIGURE 9A exemplifies a shaft of a screwdriver of the invention;

[0019] FIGURE 9B shows a cross-section of the shaft taken along line 9B-9B of FIG. 9A;

[0020] FIGURE 9C shows a cross-section of the shaft taken along line 9C-9C of FIG. 9A;

[0021] FIGURE 10A exemplifies a shaft of a screwdriver of the invention having a bit moving upwardly inside a barrel of the shaft;

[0022] FIGURE 10B shows a cross-section of the shaft taken along line 10B- 10B of FIG. 10A;

[0023] FIGURE 11A exemplifies a shaft of a screwdriver of the invention having a bit moving upwardly inside a barrel of the shaft;

[0024] FIGURE 11B shows a cross-section of the shaft taken along line 11B- 11B of FIG. 11 A;

[0025] FIGURE 12A exemplifies a shaft of a screwdriver of the invention having a bit moving upwardly inside a barrel of the shaft;

[0026] FIGURE 12B shows a cross-section of the shaft taken along line 12B- 12B of FIG. 12 A; PATENT

[0027] FIGURE 13 exemplifies a shaft of a screwdriver of the invention having a bit moving upwardly inside a barrel of the shaft;

[0028] FIGURE 14A exemplifies a shaft of a screwdriver of the invention having a bit in position for use;

[0029] FIGURE 14B shows a cross-section of the shaft taken along line 14B- 14B of FIG. 14 A;

[0030] FIGURE 15 exemplifies a shaft of a screwdriver of the invention having a bit moving downwardly inside a barrel of the shaft;

[0031] FIGURE 16 is a perspective view exemplifying a screwdriver of an alternate embodiment of the invention;

[0032] FIGURE 17 is a perspective view of the screwdriver of FIG. 16, showing a lower end of the screwdriver;

[0033] FIGURE 18 is a cross-sectional view of the screwdriver of FIG. 16 taken along line 18-18 of FIG. 16;

[0034] FIGURES 19 and 20 are perspective views of an alternate embodiment of the invention embodying principles of the present invention;

[0035] FIGURE 21 exemplifies a receiver of the screwdriver without an outer cover;

[0036] FIGURE 22 exemplifies an outer cover of the screwdriver without a receiver;

[0037] FIGURE 23 exemplifies a side view of the screwdriver in a locked position for operation;

[0038] FIGURE 24 is a bottom view of the screwdriver of FIG. 23 taken along the line 24-24 of FIG. 23;

[0039] FIGURE 25 exemplifies a side view of the screwdriver in an unlocked position for changing a bit;

[0040] FIGURE 26 is a bottom view of the screwdriver of FIG. 25 taken along the line 26-26 of FIG. 25;

[0041] FIGURE 27 exemplifies how the embodiment of FIGS. 19 and 20 may be mounted to a chuck of a power drill; and

[0042] FIGURE 28 exemplifies how the embodiment of FIGS. 19 and 20 may be permanently mounted to a power drill. PATENT

DETAILED DESCRIPTION

[0043] The following description is presented to enable any person skilled in the art to make and use the invention, and is provided in the context of a particular application and its requirements. Various modifications to the disclosed embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein. Additionally, as used herein, the term "substantially" is to be construed as a term of approximation. Refer now to the drawings wherein like or similar elements are designated by the same reference numeral through the several views.

[0044] Referring to FIGURE 1 of the drawings, the reference numeral 90 generally designates a storage device embodying features of the present invention for storing storage items such as, by way of example, but not limitation, artist charcoal/pencils, children's crayons, drill bits, taps (for cutting threads), bobbins for sewing, spices, gauge pins, bits for a screwdriver, fishing weights, and the like. The storage device 90 includes a number of cartridges 308, each of which defines a cavity (not shown in FIG. 1) for storing a single storage item. The storage device 90 includes a receiver 92 that defines at least one cell (not shown in FIG. 1) for receiving the at least one cartridge 308, and a passageway (not shown in FIG. 1) extending longitudinally along the center of the receiver to an opening 309 defined in an external surface of the receiver for inserting items into the unit, and for retrieving items from the unit. The passageway facilitates passage of a selected storage item between a cartridge 308 cavity and the opening 309. In the interest of efficiency, the storage device 90 is described in further detail below with respect to one application relating to a multi-bit screwdriver.

[0045] Accordingly, in FIGURE 1A of the drawings, the reference numeral 100 generally designates a multi-bit screwdriver embodying features of the present invention. The screwdriver 100 preferably includes a handle portion 102, a ratchet 310, a shaft portion 104, and a bit portion 106, all of which portions will be described in further detail below.

[0046] FIGURE 2A is perspective view exemplifying the bit 106. FIGURE 2B is a side view of the bit of FIG. 2A, and as shown therein, the bit 106 includes a base PATENT portion 202 and a head portion 204. Head portion 204 is depicted as a Philips head, but may be of any suitable or desirable shape, such as a slotted (flat) head, square, hex socket, Allen, spanner head, spline drive, or the like. Base portion 202 preferably includes a number of generally concave sides or surfaces 206 arranged in any suitable shape, such as a hexagon or six-pointed star having six generally concave sides in a preferred embodiment, depicted in FIGURE 2C, or in alternative embodiments, base portion 202 may define any of a number of different shapes, such as a hexagon, pentagon, octagon, or the like with sides 206 which may be flat, but which are preferably concave, or the like, having edges, such as depicted by reference numeral 212. FIGURE 2D shows sides 206 of the base portion 202, and the edge 212, preferably conically canted toward head portion 204 at an angle 210 from a line 214 parallel to a centerline 208 of the bit 106. The angle 210 is preferably about 1°, but may vary from 0° to about 10° for reasons discussed below. Bit 106 is preferably made from substantially hard, non-magnetic material, such as high manganese steel alloy, stainless steel, or the like.

[0047] FIGURES 3 A and 3D are cross-sections of screwdriver 100 taken along line 3-3 of FIG. 1. Handle 102 preferably defines six columns 302, though more or less such columns may be so defined. Each column 302 includes at least one row 304 (three of which rows are exemplified in FIG. 3D), and each row 304 of each column 302 defines one respective cell 306 for holding one respective cartridge 308, discussed below. The screwdriver 100 preferably also includes a ratchet mechanism 310, which may comprise any conventional ratchet mechanism, but preferably a ratchet as taught in co-pending Patent Application No. 14/677,698, filed April 2, 2015, and incorporated herein by reference in its entirety.

[0048] FIGURES 3B and 3C depict a view of upper and lower cell surfaces, respectively, of a row 304 of cells 306. As shown in FIG. 3C and in dashed outline in FIG. 3B, each upper and lower surface preferably includes two receiver magnets 314 and 316 embedded therein in each cell 306. The north and south polarities of the magnets are designated in the drawings by positive and negative signs ("+" and "-"), respectively. The magnets 314 and 316 are preferably oriented to have opposite polarities. While polarities of magnets 314 and 316 are depicted of particular polarities, polarities may be reversed so long as resultant magnetic interactions are consistent with interactions caused by polarities described herein. PATENT

[0049] FIGURES 4-7 depict a cartridge 308 configured to receive and hold bit 106 in cell 306, and preferably fabricated from a non-magnetic material such as plastic, high manganese steel alloy, stainless steel, or the like. The cartridge 308 defines a cavity 402 for receiving bit 106 (FIG. 7), and a button 404. The cartridge 308 preferably includes three cartridge magnets, namely, a cavity magnet 410 positioned at the bottom of the cavity 402, and upper and lower magnets 406 and 408 positioned in upper and lower portions of the button 404. The polarity of the magnets 406 and 408 is preferably oriented the same, and opposite that of magnet 410. As exemplified most clearly in FIG. 5, the positive or north ends of magnets 406, 408, and 410 is represented by ends 406a, 408a, and 410b respectively; thus, as viewed in FIGS. 5, 6 A, and 6B, positive or north ends 406a and 408a of magnets 406 and 408 are oriented upwardly, and the positive or north end 410b of magnet 410 is oriented downwardly. Conversely, the negative or south ends of magnets 406, 408, and 410 is represented by ends 406b, 408b, and 410a respectively; thus, as viewed in FIGS. 5, 6A, and 6B, negative or south ends 406b and 408b of magnets 406 and 408 are oriented downwardly, and the negative or south end 410a of magnet 410 is oriented upwardly.

[0050] Referring back to FIGURE 3D, as discussed above, the screwdriver 100 includes handle 102, which includes a number of columns 302, each of which columns includes at least one row 304 (three of which rows are exemplified in FIG. 3D), and each row 304 of each column 302 defines one respective cell 306. As shown in FIG. 3D, a cartridge 308 is positioned in each cell 306. For purposes of illustration, each cartridge is shown holding a Philips head bit, though typically, various bits, discussed above, would be stored in the cartridges. The screwdriver 100 further preferably includes a passageway 309 and a funnel 311 (with a lower opening slightly larger than an upper opening) for facilitating and directing the passage of bits between passageway 307 (FIGS. 3B, 3C) of the handle 102 and the shaft 104. Bores 313 and 315 are preferably formed for the purpose of facilitating placement of magnets 314 and 316, respectively, in the upper row of cells 306 of the handle 102.

[0051] FIGURE 8 A depicts a cross section of one row 304 of the handle 102 taken along line 8-8 of FIG. 3D. The row is exemplified in handle 102 having six columns 302, and hence, six cells 306 and six cartridges 308. For purposes of illustration of operation, letters are appended to the cartridges 308 to distinguish them, one from another. PATENT

FIGURES 8B-8D will be discussed further below with respect to operation of the screwdriver.

[0052] FIGURE 9A depicts a cross-section of the shaft 104 and ratchet mechanism 310 taken along line 3-3 of FIG. 1A. The shaft 104 includes a barrel 320 rotatably fixed to the ratchet mechanism 310 and handle 102. A sleeve 332 is slidably positioned about barrel 320, and restrained in axial movement by a catch 321. A spring 330 urges the sleeve against the catch 321, and a finger pull 324 is positioned on the sleeve for enabling a user to use a finger (or alternatively a thumb) to pull the sleeve back against the bias of spring 330. The interior of barrel 320 is preferably configured with a number of lands 322 that are tapered so that the barrel interior has a substantially circular cross-section at a lower end (as viewed in FIG. 9A) which tapers, at an upper end (as viewed in FIG. 9A), to a substantially polygonal shape, preferably a generally hexagonal or six-pointed star shape having six generally convex sides as shown in FIGS. 12B and 14B and corresponding to the sides of the bit shown in FIG. 2C. The taper of lands 322 along the barrel are seen more clearly in FIGS. 9A-15, discussed below in connection with the operation of the screwdriver 100. The number and shape of sides of the polygonal cross-section correspond to the number and shape of lands 322 of the barrel, which corresponds to the number and shape of sides of base 202 of bit 106. In a preferred embodiment, depicted in the figures, base 202 of bit 106 consists of six generally concave sides, as shown in FIG. 2C, and the barrel consists of six generally convex lands configured at the upper end to matingly engage the six generally concave sides 206 of base 202.

[0053] As more clearly depicted in FIG. 14 A, toward the upper end of barrel 320 and sleeve 332, the inside diameter of sleeve 332 opens along a taper 332a creating space 342. A leaf spring 326 is positioned between barrel 320 and sleeve 332 and secured thereto at 327 using securing means, such as conventional staking or clipping. A locking block 328 is positioned and secured atop each leaf spring 326. When sleeve 332 is in an upward position (as shown in FIGS. 9A, 10A, 11 A, 12A, 13, and 14A), the taper 332a presses against leaf springs 326 causing the leaf springs to bias locking blocks 328 toward two corresponding openings 344 defined in the barrel 320. Locking blocks 328 are further preferably provided with bottom surfaces 328b which seat on corresponding lower surfaces 344a of openings 344, both of which bottom surfaces 328b and lower surfaces 344a are inclined downwardly into the interior of barrel 320 at an angle 329 (FIG. 13) PATENT greater than zero but less than about 30° to further bias locking blocks 328 into openings 344. To prevent locking blocks 328 from falling into and through openings 344, sides 328c (FIG. 14B) of the locking blocks are configured in a wedge shape which wedges against sides 344c of openings 344. The wedging action is particularly acute when a load is applied to bit 106 (FIG. 14A) which then urges wedge-shaped sides 328c of locking blocks 328 inwardly against wedge-shaped sides 344c of openings 344, thus providing a backstop for supporting bit 106 under load. Locking blocks 328 preferably also define tapers 328a at lower ends of the barrel side of the blocks, for pushing locking blocks 328 outwardly against leaf spring 326 pressure, upon contact with bit 106, and allowing bit 106 to pass when it is moving upwardly through barrel 320, as shown in FIG. 13. Leaf spring 326 pressure is such that momentum of traveling bit 106 is capable of overcoming pressure and thereby pushes locking blocks 328 out of the bit path. * Once bit 106 passes the locking blocks, the locking blocks retum to the position of blocking the bit from moving back into the barrel 320. Bit 106 continues travel toward an opening 346 at the end of barrel 320, and is restrained from traveling of the barrel by stop 348. It may be appreciated that as a user uses a finger to pull the sleeve 332 back, as depicted in FIG. 15, the taper 332a moves downwardly allowing leaf springs 326 to expand outwardly into space 342, and locking blocks 328 to move outwardly from the openings 344 of the barrel 320. It may also be appreciated that surfaces of locking blocks 328 may be suitably curvilinear (i.e. , non-flat) to conform with openings 344 and fit within the curved space 342. It may be further appreciated that the combination of locking blocks 328, leaf spring 326, sleeve 332, and stops 348form a locking mechanism to secure a bit 106 in place at the end of the shaft 104.

[0054] In operation, with bits 106 loaded in cartridge cavities 402, a user selects bit 106 as shown most clearly by FIGS. 8A-8D, showing a cross-section of handle 102 taken along line 8-8 of FIG. 3D. FIG. 8A depicts an initial state of cartridges 308 in handle 102. By way of example, if a user desires to use bit 106 in cartridge 308a, then he would apply force with a finger to button 404 of cartridge 308a in a direction indicated by arrow 820. As cartridge 308a is pushed inwardly, cartridges 308b are pushed outwardly, until cartridge 308a is positioned as shown in FIG. 8C, at which point cartridges 308b are restored to their original position, which tends to hold cartridge 308a in its new position shown in FIG. 8C. The negative polarity of magnet 408 of cartridge 308a and the negative polarity of magnet 316 (FIG. 3C), together with the positive polarity of magnet 406a of PATENT cartridge 308a and magnet 316 (FIG. 3B) further tend to repel and thereby restrain cartridge 308a in the position of FIG. 8C.

[0055] Once cartridge 308a is in the position of FIG. 8C, the bit 106 positioned in cavity 402 of cartridge 308a is aligned with the center of the barrel 320. A user may then flick the screwdriver 100 with his or her hand to apply centrifugal force to move the bit 106 into and along the barrel 320 as shown in FIG. 9A. FIG. 9B shows how the barrel 320 cross-section is substantially circular, with small lands 323. FIG. 9C shows the normal position of locking blocks 328 when bit 106 is not in position for use. FIG. 10A shows bit 106 moving upwardly in the direction of arrow 1002, and FIG. 10B shows how the lands 323 are enlarging. FIG. 11A shows bit 106 continuing to move upwardly in the direction of arrow 1002, and FIG. 11B shows how lands 323 continue to enlarge toward the sides 206 of base 202 of bit 106. FIG. 12A shows bit 106 continuing to move upwardly in the direction of arrow 1002 toward the locking blocks 328, and FIG. 12B shows how lands 323 continue to enlarge toward the sides 206 of base 202 of bit 106, almost coinciding with them. FIG. 13 shows bit 106 continuing to move upwardly and engaging locking blocks 328, causing locking blocks 328 to move outwardly, against spring 326 pressure, as bit 106 passes them. FIG. 14A shows bit 106 in position just above locking blocks 328 sufficiently to allow locking blocks 328 to re-enter openings 344 and prevent bit 106 from moving downwardly, while stops 348 prevent bit 106 from moving upwardly, thereby securing bit 106 in position for use. FIG. 14B shows how the lands 323 fully engage the sides 206 of the base 202 of bit 106, thereby preventing bit 106 from rotating, rendering bit 106 ready for use. It can be appreciated that the configuration of the lands 323 allows a bit 106 to enter barrel 320 at virtually any angular orientation, and to be adjusted in its orientation as it moves along inside the barrel so that at the upper end of the barrel, the bit is properly oriented with the shaft 104, secured therein, and ready for use in the screwdriver 100.

[0056] When bit 106 is no longer needed or another bit is desired, bit 106 may be restored to its cartridge 308 by using a finger or thumb to pull downwardly on the finger pulls 324, thereby pulling taper 332a back, and allowing leaf springs 326 to expand outwardly into space 342, thereby allowing bit 106 to fall back into the barrel, until it lands in cavity 402 of its respective cartridge 308, positioned as shown in FIG. 8C. With reference to FIG. 8D, a user may then press button 404 of cartridge 308d in the direction of arrow 822 to push cartridge 308a in the direction of arrow 824 back to its original PATENT position of FIG. 8A, but without pushing cartridge 308d to a position as shown by cartridge 308a in FIG. 8C. When cartridge 308d pushes cartridge 308a far enough for magnets 406 and 408 (FIGS. 4-7) of cartridge 308a to pass over magnets 316 (FIGS. 3B, 3C), the magnetic force repels the cartridge back to its original position as shown in FIG. 8A. At this point, the user stops pushing in the direction of arrow 822 and magnetic forces of magnets 316 (FIGS. 3B, 3C) attracting cartridge 308d magnets 406, 408 and 410, attract cartridge 308d back to its original position, shown in FIG. 8A.

[0057] If bits 106 have not been or are not loaded into cartridge cavities 402, then, with reference to FIGS. 8B and 8C, a user may continue pushing cartridge 308a until cartridge 308a engages and pushes cartridge 308d far enough out of its respective cell 306 so that a user may grab and pull cartridge 308a out of respective cell 306. A bit 106 may then be loaded into cavity 402 of cartridge 308d. Cartridge 308d is then placed back into its respective receiver cell 306 and pushed in until it engages cartridge 308a as shown in FIG. 8D and pushes cartridge 308a until its respective magnets 314 and 316 pull cartridge 308a back to a proper position in its respective cell 306. Cartridge 308d is then released so that its respective magnets 314 and 316 may pull cartridge 308d back to its proper position within its respective cell 306. The same procedure used to load bits 106 may also be used to unload or remove bits 106 from a cartridge cavity 402, or to replace bits 106 with other bits 106.

[0058] FIGURE 16 depicts a screwdriver 1700 according to an alternative embodiment of the invention, similar to the embodiment of screwdriver 100 described above with respect to FIGS. 1A-15, but in which a selected bit 106 is dropped out of an opening defined in a lower end of the handle, rather than being passed through the shaft 104. Accordingly, as shown in FIG. 16, the screwdriver 1700 preferably includes a handle 1702, a ratchet 1710, a shaft 1704, and a driver 1706. The handle 1702 includes a bit holder portion 1712. As shown in FIGURE 17, a lower end of the handle 1702 defines an opening 1708 through which bits 106 may fall out, as discussed below.

[0059] FIGURE 18 depicts a cross-section of the screwdriver 1700 taken along the line 18-18 of FIG. 16. Bit holder portion 1712 of handle 1702 as shown is configured with six columns and two rows defining twelve cells 1806 for holding up to twelve cartridges and bits 106 in a manner similar to screwdriver 100 described above. As with the embodiment described above with respect to FIGS. 1A-15, the number of columns may vary from six columns, and the number of rows may vary from two or three. While PATENT not shown, the cells 1806 are adapted for receiving the same cartridges 308 as described above with respect to screwdriver 100 of FIGS. 1A-15. The cells 1806 are virtually identical to the cells 306 but for being oriented 180° (about a horizontal axis) from the cells 306 relative to the rest of the screwdriver, and therefore will not be described in further detail herein.

[0060] The portion 1714 of the screwdriver 1700 above the bit holder 1712 is configurable in any suitable manner as a conventional screwdriver, and therefore will not be discussed in further detail herein.

[0061] Operation of screwdriver 1700 of FIGS. 16-18 is similar to operation of screwdriver 100 of FIGS. 1A-15, except when a user presses a button 404 of a cartridge 308, a bit falls downwardly, as viewed in FIG. 18, and out through opening 1708, for capture by a user. The user then mounts bit 106 onto driver 1706. When work using the bit 106 is complete, the bit is manually removed from the driver 1706, the screwdriver is oriented with the opening facing upwardly, and the bit is placed in the opening 1708 wherein it falls into the cartridge 308 from whence it came, and the cartridge is pushed back into position shown in FIG. 8A and discussed above.

[0062] FIGURES 19-28 depict a power screwdriver 2100 according to an alternate embodiment of the invention wherein multi-bit screwdriver 100 is adapted for being driven by a power tool, such as a power drill (FIGS .27-28), by adding a shank to a bottom end of the screwdriver. Since power screwdriver 2100 contains many components that are similar or identical to those of screwdriver 100, exemplified by FIGS. 2-15, such components are referred to by the same reference numerals and will not be described in any further detail.

[0063] FIGURES 19 and 20 show two perspective views of one embodiment of power screwdriver 2100, including a shank 2108 extending from a bottom side 92a of receiver 92, and wherein receiver 92 comprises only a single row 304 (FIG. 3D) of cells 306 (FIG. 3 A) and a shaft 2104 is similar to shaft 104, but is relatively shorter. It is understood that power screwdriver 2100 may be configured with multiple rows 304 of cells 306 and that shaft 2104 may be scaled longer or shorter. In a preferred embodiment, an outer cover 2112 envelopes cells 306 of receiver 92, and defines openings 2114 configured for providing access to cells 306 of the receiver. Outer cover 2112 is preferably coupled to or integral with sleeve 332 to move synchronously with the sleeve. PATENT

[0064] FIGURE 21 shows power screwdriver 2100 receiver 92 without the outer cover 2112. As depicted, a longitudinal groove 2120 is defined in the receiver. In a preferred embodiment, a second longitudinal groove (not shown) is defined on an opposing side of the receiver.

[0065] FIGURE 22 shows the power screwdriver 2100 outer cover 2112 without the receiver 92. As depicted, two tongues 2126 extend inwardly from an inward surface of the outer cover. The tongues 2126 are configured to matingly engage and slide along complementary grooves 2120 when outer cover 2112 is positioned about receiver 92. It is noted that outer cover 2112 is coupled to sleeve 332 for synchronous movement with the sleeve. Thus, coil spring 330 (see, e.g., FIG. 9A) that biases sleeve 332 in a forward position toward the end of shaft 2104, also biases outer cover 2112 in a forward position. A retaining ring (not shown) or the like is preferably positioned in a groove 2128 in an end of the outer cover 2112 to limit the bias of spring 330 and the forward movement of the outer cover 2112.

[0066] FIGURES 23 and 24 illustrate an operating mode of power screwdriver 2100. As shown most clearly in FIG. 24, two tongues 2126 engage complementary grooves 2120 permitting spring 330 to slide outer cover 2112 and sleeve 332 into a forward position. In such position, outer cover 2112 covers cells 306, precluding external access to cartridges 308, and also preventing cartridges 308 from flying out of respective cells from centrifugal force generated when a power drill spins screwdriver 2100 at high speeds. It is noted that open stops 2122 and closed stops 2124 limit how much outer cover 2112 can be rotated when opening or closing, respectively, outer cover 2112.

[0067] FIGURES 25 and 26 illustrate a bit changing mode of power screwdriver 2100. As shown most clearly in FIG. 26, two tongues 2126 do not engage complementary grooves 2120, and so restrain outer cover 2112 and sleeve 332 in a rearward position. In such position, outer cover 2112 allows access to cells 306, thereby permitting external access to cartridges 308 so bits 106 may be selected, removed, or changed, as discussed above with respect to FIGS. 2-15.

[0068] FIGURES 27 and 28 exemplify how screwdriver 2100 may be coupled to a power drill 2130. In FIG. 27, shank 2108 is secured in a chuck 2132 to thereby form a temporary coupling. In FIG. 28, a more permanent coupling between screwdriver 2100 and power drill 2130 is formed when shank 2108 is secured directly to power drill 2130. PATENT

[0069] It is understood that the present invention may take many forms and embodiments. Accordingly, several variations may be made in the foregoing without departing from the spirit or the scope of the invention. For example, someone could use similar cartridge configuration but bias them with elastic or other spring material. In another example, the function performed by the tongues 2126 and grooves 2120 for the outer cover 2112 and receiver 92 may be performed by other means, such as ball and detent. In yet another example, second grooves similar to grooves 2120 could be formed in receiver 92 for receiving tongues 2126 in the closed position of outer cover 2112. In a still further example, the function performed by magnets 314, 316, 406, 408, and 410 for biasing cartridges 308 as described above could be performed by springs

[0070] Having thus described the present invention by reference to certain of its preferred embodiments, it is noted that the embodiments disclosed are illustrative rather than limiting in nature and that a wide range of variations, modifications, changes, and substitutions are contemplated in the foregoing disclosure and, in some instances, some features of the present invention may be employed without a corresponding use of the other features. Many such variations and modifications may be considered obvious and desirable by those skilled in the art based upon a review of the foregoing description of preferred embodiments. Accordingly, it is appropriate that the appended claims be construed broadly and in a manner consistent with the scope of the invention.