HK1081145B - Screw holding screwdriver bit and combination thereof with screws - Google Patents

Description

Screw-retaining screwdriver bit and combination thereof with screw

Technical Field

The present invention relates to a screw-holding screwdriver bit and a combination thereof with a screw adapted for the screwdriver bit.

Background

The present applicant has previously conducted various developments and patents on screwdrivers (for example, japanese patent publication No. 46-31719, japanese patent publication No. 47-596, and japanese patent publication No. 48-9440) which have a structure in which, when a tip of a driver blade is fitted into a notch formed in a screw head, the screw head is held by adhesion to the tip of the driver blade and is carried to a desired position, and as a mechanism for securely performing a screwing operation, a locking pin is provided on the blade portion of the driver blade, and the blade portion and the notch of the screw head are tightly fitted by an elastic force of the locking pin.

The screwdriver having these screw holding mechanisms has a structure in which a screwdriver-bit holder having a blade-holding groove and a blade-insertion hole at its tip is provided with a main portion of a blade having a width larger than the diameter of the screwdriver-bit holder and a support tail portion slightly bent and extending from the center portion of the upper edge thereof on the side surface, and one end of an elastic pin is fastened to one side surface of the upper end of the support tail portion and the other end thereof is extended to the vicinity of the lower end of an engaging projection provided at the center portion of the lower edge of the main portion of the blade, so that the blade with the screw holding pin, which is configured such that the elastic pin is distant from the blade, can be detachably fitted.

The driver having the screw holding mechanism configured as described above is directed to a special screw having a recessed groove formed in a head portion of the screw and formed by a linear groove formed transversely to a center portion of the head portion, and a locking hole formed in a center portion of the linear groove and having a diameter larger than a groove width of the linear groove. Therefore, it is difficult to fully adapt the screwdriver having the screw holding mechanism to various types of screws having various types of screw fitting grooves of today.

Conventionally, as a power tool capable of accurately, reliably, easily and safely attaching and detaching a screw, a power tool having a structure as described below has been proposed (japanese patent application laid-open No. hei 7-328946), which includes: a cylindrical member fixed to a non-rotating portion of the power tool having a rotating shaft for rotating the screw; a sliding member which is fitted to an inner peripheral side of the cylindrical member and is slidable only in an axial direction by a predetermined dimension, and which has an axial through hole into which a rotation shaft of the power tool is inserted; a slide biasing member biasing the slide member in a direction protruding from the cylindrical member; a clamping member having a screw head guide surface provided at the inner side of the front end and having a tip end opened, and a screw head holding surface connected to the rear of the guide surface and supporting the screw head so that the axis of the screw coincides with the axis of the rotating shaft, the clamping member being attached to the sliding member so as to be openable and closable in the radial direction; a closing direction urging member for urging the clamp member in a closing direction.

The power tool configured as described above is configured such that, when the slide member is immersed in the cylindrical member only by a predetermined dimension against the urging force of the slide urging member, the clamp member including the pawl portions arranged at 3 positions substantially at equal intervals along the outer peripheral surface of the slide member is locked in the closed state by the cylindrical member, and when the slide member protrudes from the cylindrical member in accordance with the urging force of the slide urging member, the locking of the clamp member is released.

As an alternative, there has been proposed a screw holding device of an electric power tool (japanese patent application laid-open No. 8-71939) configured by: a clamping shaft with a tool bit detachably mounted at the front end; a screw holding portion slidably attached to the engaging shaft without coming off, wherein at least 3 elastic holding pieces are arranged so that the tips thereof are directed in directions to expand each other, and the periphery of the elastic pieces is covered with a cylindrical cover having an open tip; and a biasing mechanism for biasing the holding portion in a direction of a distal end of the engaging shaft.

In the screw holding device configured as described above, when the head of the screw is pushed in from the distal end opening portion of the cover of the screw holding device connected to the drive shaft of the electric power tool and to which the bit corresponding to the distal end is attached, the elastic holding piece is bent outward, whereby the screw head can be inserted to the position engaging with the bit beyond the ヘ -shaped bent portion thereof. In this state, the elastic holding piece is restored by its own elastic force and pressed against the periphery of the screw head, thereby holding the screw in a state of coming off.

However, in the conventional screw driver having the screw holding mechanism configured as described above, the screw head is not held by being fitted into the bit fitting groove formed in the screw head, but the outer periphery of the screw head is elastically clamped by the clamping member or the periphery of the head of the screw is held by being pressed by the elastic holding piece. Therefore, although the conventional screw driver having the screw holding mechanism has an advantage of not using a magnet, the shape and structure of the clamp member and the elastic holding piece are complicated, and the number of parts is increased, which causes not only a manufacturing cost but also a manufacturing cost.

In the past, in the combination of a screw and a driver bit, the present applicant has developed the following combination of a screw and a driver bit and has filed a patent application (japanese patent application laid-open publication No. 8-145024): by improving the groove structure of the driver bit fitting groove formed in the screw head, the driver bit can be effectively prevented from coming out (カムアウト) during the screw tightening operation, the screw can be prevented from being damaged as before, and even if the driver bit fitting groove of the screw is damaged, the screw tightening operation can be completed accurately and quickly in general, and the operation efficiency can be remarkably improved.

That is, the combination of the screw and the driver bit according to the above-described aspect is suitable for a driver having a structure in which a vertical end wall portion having a predetermined depth is formed at an end edge portion of a bit fitting groove of a screw head, horizontal step portions are provided from the vertical end wall portions, inclined groove portions are formed extending from the horizontal step portions toward a center portion of a screw neck portion, a substantially conical bottom surface is formed at a bottom portion thereof, and a wing portion that engages with a vicinity of the horizontal step portion is provided.

Accordingly, the screw configured as described above has an advantage that, when the tip end of the driver bit is fitted into the bit fitting groove, the screw is configured to have a small inclined contact area with respect to the entire bit fitting groove, and the vertical end wall portion and the horizontal step portion are provided so as to increase the area of the side wall portion in contact with the tip end of the driver bit at the boundary portion between the adjacent bit fitting grooves, thereby reliably preventing the driver bit from coming out. In the screw having such a configuration, since the wing portions each having the substantially right-angled edge portion to be fitted into the horizontal step portion formed at the end edge portion of the bit fitting groove of the screw are provided, the driver bit most suitable for the screw can be obtained.

The present inventors have made various studies and trial production and found that: the combination of a screw-holding screwdriver bit and a screw, which has a relatively simple structure, can be easily manufactured at low cost, and has versatility, can be obtained by providing a plurality of blade portions each having a substantially vertical end edge portion at a distal end portion, cutting off a part of each blade portion in the axial direction of the bit, forming a long groove as a guide passage of a desired length in a substantially extended portion of the cut-off portion of the blade portion in a continuous rotational shaft portion, and inserting and holding an elastic piece having a screw holding function in the guide passage by interaction with the blade portion which is elastically brought into contact with a bit fitting groove of the screw head and fitted in the bit fitting groove.

Disclosure of Invention

Accordingly, an object of the present invention is to provide a screw holding type driver bit and a combination of the driver bit and a screw, which can effectively prevent a coming-out phenomenon, can be manufactured at low cost with a simple structure, and can normally perform a screw tightening operation reliably and rapidly, thereby significantly improving the operation efficiency, by improving the blade part structure of the driver bit.

In order to achieve the above object, a screw-retaining driver bit according to the present invention is a screw-retaining driver bit having a plurality of flat blade portions formed with substantially perpendicular end edge portions at a tip end of a rotation shaft portion of a tip end portion thereof, and adapted to a screw having a bit fitting groove formed in a cross shape, a triangular shape, a deformed hexagonal shape, or the like, the screw including: a cutting portion formed by cutting a part of one of the plurality of flat blade portions in a blade axis direction; a long groove formed by cutting a part of the rotating shaft part from the cut-out part by a predetermined length on an extension line thereof; a protective sleeve attached to surround an outer circumference of a rotary shaft in which the long groove is formed, with a part of a tip of the flat blade portion exposed; and an elastic piece, between the cut-off part of the flat blade part and the elongated slot on the extension line thereof and the protective sleeve, the front end part of which is exposed from the protective sleeve together with the flat blade part, and which is inserted and arranged in a position shifted in the circumferential direction with respect to the cut-off part; the long groove is formed to have a width slightly larger than the thickness of the cut flat blade part, and the elastic piece is inserted into the long groove by bending a part of the elastic piece in the circumferential direction of the rotating shaft; the protective sleeve is fitted and fixed by caulking at the rear end portion mounted on the rotating shaft and in a notch portion provided on the outer periphery of the rotating shaft; the screw is held when the tip end portion of the elastic piece is fitted into the bit fitting groove of the screw by an elastic force acting in a direction opposite to a screwing direction of the screw.

A screw-retaining driver bit according to the present invention is a screw-retaining driver bit having a plurality of flat blade portions formed as substantially perpendicular end edge portions at a tip end of a rotation shaft portion of a tip end portion, and adapted to a screw having a bit fitting groove formed in a cross shape, a triangular shape, a deformed hexagonal shape, or the like, the screw-retaining driver bit including: a cutting portion formed by cutting a part of one of the plurality of flat blade portions in a blade axis direction; a long groove formed by cutting a part of the rotating shaft part from the cut-out part by a predetermined length on an extension line thereof; a protective sleeve attached to surround an outer circumference of a rotary shaft in which the long groove is formed, with a part of a tip of the flat blade portion exposed; and an elastic piece (18) which is arranged between the cut-off part of the flat blade part and the long groove on the extension line thereof and the protective sleeve, the front end part of the elastic piece is exposed from the protective sleeve together with the flat blade part, and the elastic piece is inserted and arranged in a position deviated along the circumferential direction relative to the cut-off part; the elongated groove is formed to have a width substantially equal to the thickness of the cut flat blade portion, is formed to be offset in the circumferential direction with respect to the position of the cut flat blade portion, and is inserted without bending the elastic piece; the protective sleeve is fitted and fixed by caulking at the rear end portion mounted on the rotating shaft and in a notch portion provided on the outer periphery of the rotating shaft; the tip of the elastic piece is fitted into the bit fitting groove of the screw by an elastic force acting in a direction opposite to a screwing direction of the screw, and holds the screw.

A screw-retaining driver bit according to the present invention is a screw-retaining driver bit having a plurality of flat blade portions formed as substantially perpendicular end edge portions at a tip end of a rotation shaft portion of a tip end portion, and adapted to a screw having a bit fitting groove formed in a cross shape, a triangular shape, a deformed hexagonal shape, or the like at a head portion, the screw-retaining driver bit including: a cutting portion formed by cutting a part of one of the plurality of flat blade portions in a blade axis direction; a long groove formed by cutting a part of the rotating shaft part from the cut-out part by a predetermined length on an extension line thereof; a protective sleeve attached to surround an outer circumference of a rotary shaft in which the long groove is formed, with a part of a tip of the flat blade portion exposed; and an elastic piece (18) which is arranged between the cut-off part of the flat blade part and the long groove on the extension line thereof and the protective sleeve, the front end part of the elastic piece is exposed from the protective sleeve together with the flat blade part, and the elastic piece is inserted and arranged in a position deviated along the circumferential direction relative to the cut-off part; the elongated groove is formed to have a width substantially equal to the thickness of the cut flat blade portion, is formed to be offset in the circumferential direction with respect to the position of the cut flat blade portion, and is inserted without bending the elastic piece; the protective sleeve is fitted and fixed by caulking at the rear end portion mounted on the rotating shaft and in a notch portion provided on the outer periphery of the rotating shaft; the elastic piece is provided with a clamping protrusion which is clamped with a clamping groove which is arranged in the direction vertical to the long groove corresponding to the rear end part of the elastic piece; the tip of the elastic piece is fitted into the bit fitting groove of the screw by an elastic force acting in a direction opposite to a screwing direction of the screw, and holds the screw.

A screw-retaining driver bit according to the present invention is a screw-retaining driver bit having a plurality of flat blade portions formed as substantially perpendicular end edge portions at a tip end of a rotation shaft portion of a tip end portion, and adapted to a screw having a bit fitting groove formed in a cross shape, a triangular shape, a deformed hexagonal shape, or the like at a head portion, the screw-retaining driver bit including: a cutting portion formed by cutting a part of one of the plurality of flat blade portions in a blade axis direction; a long groove formed by cutting a part of the rotating shaft part from the cut-out part by a predetermined length on an extension line thereof; a protective sleeve attached to surround an outer circumference of a rotary shaft in which the long groove is formed, with a part of a tip of the flat blade portion exposed; and an elastic piece, between the cut-off part of the flat blade part and the elongated slot on the extension line thereof and the protective sleeve, the front end part of which is exposed from the protective sleeve together with the flat blade part, and inserted and arranged in a position shifted in the radial direction with respect to the cut-off part; the long groove is at least as wide as the thickness of the cut flat blade part, and the elastic sheet is inserted into the long groove by bending a part of the elastic sheet along the radius direction of the rotating shaft; the protective sleeve is fitted and fixed by caulking at the rear end portion mounted on the rotating shaft and in a notch portion provided on the outer periphery of the rotating shaft; the tip of the elastic piece is fitted into the bit fitting groove of the screw by an elastic force acting in a radial direction of the screw, and holds the screw.

A screw-retaining driver bit according to the present invention is a screw-retaining driver bit having a plurality of flat blade portions formed as substantially perpendicular end edge portions at a tip end of a rotation shaft portion of a tip end portion, and adapted to a screw having a bit fitting groove formed in a cross shape, a triangular shape, a deformed hexagonal shape, or the like at a head portion, the screw-retaining driver bit including: a cutting portion formed by cutting a part of one of the plurality of flat blades in a blade axis direction and cutting a part of the rotation axis portion of the blade by a predetermined length from the cut flat blade; a protective sleeve attached to surround an outer circumference of a rotary shaft forming the cut-off portion in a state where a part of a tip of the flat blade portion is exposed; and an elastic piece, between the flat blade part and the cut-out part on the extension line thereof and the protective sleeve, the front end part of the elastic piece is exposed from the protective sleeve together with the flat blade part, and the elastic piece is inserted and configured to be deviated in the circumferential direction relative to the cut-out part; bending a portion of a protective sleeve mounted on an outer periphery of a rotary shaft so as to surround the flat blade section and the elastic piece to form a bent portion and form a guide passage for inserting and disposing the elastic piece; the protective sleeve is fitted and fixed by caulking at the rear end portion mounted on the rotating shaft and in a notch portion provided on the outer periphery of the rotating shaft; the tip of the elastic piece is fitted into the bit fitting groove of the screw by an elastic force acting in a direction opposite to a screwing direction of the screw, and holds the screw.

A screw-retaining driver bit according to the present invention is a screw-retaining driver bit having a plurality of flat blade portions formed as substantially perpendicular end edge portions at a tip end of a rotation shaft portion of a tip end portion, and adapted to a screw having a bit fitting groove formed in a cross shape, a triangular shape, a deformed hexagonal shape, or the like at a head portion, the screw-retaining driver bit including: a cutting portion formed by cutting a part of one of the plurality of flat blades in a blade axis direction and cutting a part of the rotation axis portion of the blade by a predetermined length from the cut flat blade; a protective sleeve attached to surround an outer circumference of a rotary shaft forming the cut-off portion in a state where a part of a tip of the flat blade portion is exposed; and an elastic piece, between the flat blade part and the cut-out part on the extension line thereof and the protective sleeve, the front end part of the elastic piece is exposed from the protective sleeve together with the flat blade part, and the elastic piece is inserted and configured to be deviated in the circumferential direction relative to the cut-out part; the cut-out part is provided with an inverted U-shaped retaining pin to retain a part of the elastic piece to form a guide passage for inserting and arranging the elastic piece; the protective sleeve is fitted and fixed by caulking at the rear end portion mounted on the rotating shaft and in a notch portion provided on the outer periphery of the rotating shaft; the tip of the elastic piece is fitted into the bit fitting groove of the screw by an elastic force acting in a direction opposite to a screwing direction of the screw, and holds the screw.

Drawings

Fig. 1 is a main part sectional side view showing one embodiment of a screw-holding type screwdriver bit of the present invention.

Fig. 2 is an end view of the head tip of the screw-holding screwdriver bit shown in fig. 1.

Fig. 3 is a sectional view taken along line III-III of the screw-holding screwdriver bit shown in fig. 1.

Fig. 4 is a principal part sectional side view of the screw-holding type screwdriver bit shown in fig. 1, as seen from the right side.

Fig. 5 is a plan view showing a principal part of a screw head in a state where the screw is held by a screw-holding-type driver bit, which is an example of a screw applied to the screw-holding-type driver according to the present invention.

Fig. 6 is a main cross-sectional side view of the screw head in a state of being shifted to the screw holding by the screw holding type screwdriver bit of the screw head shown in fig. 5.

Fig. 7 is an end view showing the tip of the head of a modified example of the screw-holding-type screwdriver bit of the present invention.

Fig. 8 is a major part sectional side view of the screw-holding type screwdriver bit shown in fig. 7.

Fig. 9 is a principal part sectional side view showing another modification of the screw-holding type screwdriver bit shown in fig. 8.

Fig. 10 is an end view showing the tip of the head of a screw-holding type screwdriver bit according to still another modification of the present invention.

Fig. 11 is a major part sectional side view of the screw-holding type screwdriver bit shown in fig. 10.

Fig. 12 is a plan view showing a principal section of a screw head in a state where a screw is held by a screw-holding-type driver bit, which is another example of a screw applied to the screw-holding-type driver according to the present invention.

Fig. 13 is a plan view showing another embodiment of the head of the screw holding type screwdriver of the present invention and a screw suitable for the head, and is a sectional view of essential parts of the head of the screw holding type screwdriver in a state where the head and the screw are held.

Fig. 14 is a plan view showing a principal section of a head portion of a screw-holding type screwdriver according to still another embodiment of the present invention and a screw suitable for the head portion, the head portion of the screw-holding type screwdriver and the head portion of the screw in a holding state.

Fig. 15 is an end view showing the tip of the head of another embodiment of the guide passage in which the elastic piece of the screw-holding type screwdriver bit of the present invention is inserted and disposed.

Fig. 16 is an end view showing the tip of the head of still another embodiment of the guide passage in which the elastic piece of the screw-holding type screwdriver bit of the present invention is inserted and disposed.

Fig. 17 is an end view of the head tip of the screw-holding screwdriver bit shown in fig. 16.

Fig. 18 is a principal end side view showing a screw-holding type screwdriver bit according to still another embodiment of the present invention.

Detailed Description

Hereinafter, a screw holding type screwdriver bit and a combination thereof with a screw according to the present invention will be described in detail with reference to the accompanying drawings.

[ example 1 ]

Fig. 1 to 4 show one embodiment of a screw-holding type screwdriver bit of the present invention. And figures 5 and 6 show one embodiment of a screw suitable for a screw-retaining shaped screwdriver bit of the present embodiment. That is, in fig. 1 to 4, 5 and 6, reference numeral 10 denotes an essential portion of the screw holding type driver bit of the present embodiment, and the tip end portion 12a of the blade portion 12 at the tip end of the rotary shaft 11 of the driver bit 10 is configured as a bit fitting groove 32 formed as a cross-recessed groove in a center portion of the screw head 30a of the screw 30.

Therefore, the screw-holding-type driver bit 10 of the present embodiment is configured to have a plurality of (4 in the illustrated embodiment) flat blade portions 12 which are fitted into the bit fitting groove 32 of the screw 30 and engage with the substantially vertical end wall portion 33a and the two side wall portions 33b and 33b formed in the opening end edge portion 32a of the bit fitting groove 32 and the substantially vertical end wall portion 13 formed in the conical bottom portion 34, respectively, and to form the conical projecting portion 14 having an inclination angle θ of substantially 1 to 45 °, preferably 25 to 35 °, with respect to the horizontal plane in the tip center portion of the flat blade portion 12 corresponding to the conical bottom portion 34 of the bit fitting groove 32 which is formed from the end wall portion 33a toward the center portion of the screw neck portion 30 b.

Therefore, in the screw-holding type driver bit 10 of the present embodiment, the plurality of flat blade portions 12 having the substantially perpendicular end edge portion 13 formed at the distal end portion 12a are formed such that a part of the flat blade portion 12 is cut off in the bit axial direction with respect to any one of the flat blade portions 12, and a long groove 16 having a desired length is formed at a portion of the continuous rotary shaft 11 on a substantially extended line L of the cut-off portion 15 of the flat blade portion. In addition, in the flat blade part 12 which is elastically fitted into the blade fitting groove 32 in contact with the substantially vertical side wall surface 33b of the blade fitting groove 32 of the screw head 30a, the elastic piece 18 having a screw holding function is inserted and arranged in the long groove 16. Further, the structure may be such that a protective sleeve 20 is fitted around the outer periphery of the rotary shaft 11, which is disposed in the long groove 16, with an elastic piece 18 having a screw holding function inserted therein, in a state where the distal end projection 12a of the flat blade portion 12 and the distal end portion 18a of the elastic piece 18 are exposed. The protection sleeve 20, such as a fitting end portion 20a with respect to the rotation shaft 11, may be fitted into a cutout 11a provided on a part of the outer periphery of the rotation shaft 11 and fixed by caulking.

In this case, the distal end portion 18a of the elastic piece 18 having the screw holding function is inserted into the long groove 16 and is positioned offset in the circumferential direction with respect to the flat blade portion 12 from which the distal end portion 12a is cut (see fig. 2 to 4). Therefore, the long groove 16 is formed to have a width slightly larger than the thickness of the cut flat blade portion, and the elastic piece 18 having the screw retaining function is inserted into the rotary shaft 11 so as to be partially bent in the circumferential direction (see fig. 4). With this configuration, the elastic piece 18 can hold itself in the long groove 16 by its own bending elastic force, and the tip end portion 18a of the elastic piece 18 can be positioned at a position offset from the cut flat blade portion. That is, in the illustrated example, the elastic piece 18 inserted into the long groove 16 is bent at a part 18b thereof, and thus the distal end portion 18a of the elastic piece 18 having the screw holding function can be set so as to be displaced toward the rotation rear side (the side wall portion 33b side of the bit fitting groove 32) with respect to the tightening rotation direction of the driver bit 10.

In fig. 6, the bit fitting groove 32 of the screw 30 in the present embodiment is formed in accordance with the opening dimension m according to the conventionally known JIS (japanese industrial standards). That is, the tip fitting portion 32 is configured such that substantially vertical end wall portions 33a and both side wall portions 33b, 33b having a press taper (press angle γ of the upsetting punch) of about 1.5 to 5 ° are formed at a required depth from the opening end edge portion 32a, and a tapered bottom surface 35 having an inclination angle α of about 25 to 35 ° is formed from a lower edge portion 33 a' of the end wall portion 33a toward the center of the screw neck portion 30b via a plurality of substantially horizontal step portions 34.

Next, an operation of engaging the screw-holding-type driver bit 10 (see fig. 4) and the screw 30 (see fig. 6) adapted to the bit of the present embodiment with each other will be described.

Fig. 5 and 6 are schematic views showing the engagement state between the screw holding type driver bit 10 and the screw 30 shown in fig. 4. That is, fig. 5 shows a state in which the tip portion of the flat blade portion 12 and the tip portion of the elastic piece 18 of the screw-holding-type screwdriver bit 10 are fitted in the bit fitting groove 32 formed in the screw head 30a of the screw 30. At this time, the distal end portion of the elastic piece 18 elastically contacts the side wall portion 33b of the bit fitting groove 32 on the rotation rear side with respect to the screw tightening rotation direction R of the screw holding-type driver bit 10. As a result, the elastic piece 18 elastically contacting the side wall portion 33b of the bit fitting groove 32 of the screw head 30a interacts with the flat blade portion 12 of the screw-holding-type driver bit 10 fitted in the bit fitting groove 32, thereby effectively exhibiting a screw holding function.

In the present embodiment, when the screw-holding-type driver bit 10 and the screw 30 shown in fig. 5 are engaged with each other, as shown in fig. 6, when the tip portion of the flat blade portion 12 is fitted into the bit fitting groove 32 of the screw head 30a, the tip portion 18a of the elastic piece 18 contacts the open end edge portion 32a of the bit fitting groove 32 as shown by the broken line. Therefore, by pressing the screw holding type driver bit 10 from above, the distal end portion 18a of the elastic piece 18 is elastically displaced and fitted into the bit fitting groove 32 as shown by the solid line. Thus, the distal end portion 18a of the elastic piece 18 fitted into the bit fitting groove 32 elastically contacts the side wall portion 33b of the bit fitting groove 32. Therefore, in this case, in order to smoothly fit the distal end portion 18a of the elastic piece 18 into the bit fitting groove 32, it is preferable to form an inclined surface as shown in the drawing.

[ example 2 ]

Fig. 7 and 8 show a modification of the above-described embodiment of the screw-holding-type screwdriver bit according to the present invention. That is, in the present embodiment, the long groove 15 provided in the screw-holding-type driver bit 10 is set to have a width substantially equal to the width of the flat blade portion to be cut, and is cut off so as to be shifted in the circumferential direction with respect to the position of the flat blade portion, and the elastic piece 18 having the screw holding function is not bent, and the rear end portion 18c thereof is engaged and inserted into and arranged in the long groove 16. In this case, a locking recess 17A is formed in a rear end portion 16a of the long groove 16 of the rotary shaft 11, and a locking protrusion 19A that engages with the locking recess 17A is formed in a rear end portion 18c of the elastic piece 18. The other structure is the same as that of the screw holding type screwdriver bit 10 described in embodiment 1.

In the screw-holding type screwdriver bit 10 of the present embodiment configured as described above, since the distal end portion 18a of the elastic piece 18 inserted into the elongated slot 16 disposed in the screw-holding type screwdriver bit 10 is offset in the circumferential direction with respect to the position of the cut flat blade, the screw 30 can be reliably held by the screw-holding type screwdriver bit 10 as in the case of fig. 5 and 6 of the above-described embodiment 1, and smooth screwing work can be easily performed.

[ example 3 ]

Fig. 9 shows another modification of the screw-holding type screwdriver bit of the present invention according to the embodiment 2. That is, in the present embodiment, as means for locking the rear end portion 18c of the elastic piece 18 having the screw holding function in the long groove 16 of the screw-holding-type driver bit 10, the rear end portion 16a of the long groove 16 of the rotary shaft 11 is provided with the locking groove 17b in the direction perpendicular to the long groove 16, and the rear end portion 18c of the elastic piece 18 is provided with the locking projection 19b that engages with the locking groove 17 b. Therefore, in the screw-holding type driver bit 10 of the present embodiment configured as described above, the screw 30 can be reliably held by the screw-holding type driver bit 10 exactly in the same manner as in embodiment 2 described above, and smooth screw tightening work can be easily performed.

[ example 4 ]

Fig. 10 and 11 show another embodiment of the screw-holding type screwdriver bit of the present invention. That is, in the present embodiment, the distal end portion 18a of the elastic piece 18 having the screw holding function is inserted and disposed in the long groove 16 so as to be shifted outward in the radial direction with respect to the cut flat blade portion. In this case, the long groove 16 is formed by cutting an elastic piece 18 having a screw retaining function into a shape having a width substantially equal to or slightly larger than the thickness of the cut flat blade portion and partially curved along the radial direction of the rotary shaft 11. That is, in the illustrated example, the elastic piece 18 inserted into the long groove 16 is set so as to be bent at a part 18b thereof, whereby the distal end portion 18a of the elastic piece 18 having the screw retaining function is displaced radially outward (toward the end wall portion 33a of the bit fitting groove 32) with respect to the flat blade portion 12.

Therefore, in the screw-holding type driver bit 10 configured as described above, the distal end portion 18a of the elastic piece 18 inserted into the elongated slot 16 disposed in the screw-holding type driver bit 10 is displaced outward in the radial direction with respect to the cut flat blade portion, and thus elastically contacts the end wall portion 33a of the bit fitting groove 32. As a result, the elastic piece 18 elastically contacting the end wall portion 33a of the bit fitting groove 32a of the screw head 30a interacts with the flat blade portion 12 of the screw-holding-type driver bit 10 fitted in the fitting groove 32, and thus the screw holding function can be effectively exhibited.

[ example 5 ]

Fig. 12 is a view showing another example of a screw suitable for the screw-holding type screwdriver bit of the present invention. That is, in the present embodiment, the combination of the positive and negative screws (プラマイね)30A having the configuration in which one of the linear grooves intersecting with each other of the bit fitting grooves 32 of the screw 30 shown in the above embodiment 1 can be fitted to the in-line driver bit (マイナスドライバ - ビツト) as the bit fitting grooves 32 of the screw head 30A and the screw-holding-type driver bit 10A of the embodiment 1 is configured. Accordingly, fig. 12 is a plan view showing a main part of the screw head of positive and negative screws 30A in a state where the screw is held by screw-holding type screwdriver 10A as shown in fig. 5.

Even in the combination of the screw-holding type screwdriver bit 10A and the positive and negative screws 30A of the present embodiment configured as described above, as shown in the drawing, the screws can be reliably held, and smooth screw tightening work can be easily performed.

[ example 6 ]

Fig. 13 is a view showing another embodiment of the screw-holding type screwdriver bit of the present invention and a screw adapted for use therein. The present embodiment is configured by a combination of a screw 30B having a three-sided groove branching in three directions from the center of the screw head 30a as the bit fitting groove 32 of the screw head 30a, and a screw-holding-type driver bit 10B having a flat blade portion 12 engageable with the bit fitting groove 32 of the screw 30B. Therefore, in the screw holding type driver bit 10B of the present embodiment, similarly to the screw holding type driver bit 10 of the above embodiment, the flat blade portion 12 is cut off in the bit axial direction with respect to any one of the flat blade portions 12, and a long groove 16 having a desired length is formed along a continuous part of the rotary shaft 11 in a substantial extension of the cut-off portion 15 of the flat blade portion, and an elastic piece having a screw holding function is inserted and arranged in the long groove 16 by interaction with the bit fitting groove 32 which elastically contacts the screw head portion 30a and the flat blade portion 12 fitted in the fitting groove 32.

Even in the combination of the screw-holding-type driver bit 10B and the screw 30B of the present embodiment configured as described above, as shown in the drawing, the screw can be reliably held, and smooth screw tightening work can be easily performed.

[ example 7 ]

Fig. 14 is a view showing another embodiment of the screw-holding type screwdriver bit of the present invention and a screw adapted for use therein. The present embodiment is constituted by a combination of a screw 30C provided with a deformed hexagonal hole as a bit fitting groove 32 of a screw head 30a and a screw-holding-type driver bit 10C having a deformed hexagonal corner portion 12' engageable with the bit fitting groove 32 of the screw 30C. Therefore, in the screw holding type driver bit 10C of the present embodiment, similarly to the screw holding type driver bit 10 of the above embodiment, a corner portion is cut off in the bit axial direction at any one of the corner portions 12 ' of the deformed hexagonal shape, and a long groove 16 of a desired length is engraved along a continuous part of the rotation shaft 11 in a substantial extension of the cut-off portion 15 ' of the corner portion, and the elastic piece 18 having a holding function is inserted and arranged in the long groove 16 by an interaction with the bit fitting groove 32 elastically coupling the screw head portion 30a and the corner portion 12 ' of the deformed hexagonal shape fitted in the fitting groove 32.

Even in the combination of the screw-holding-type driver bit 10C and the screw 30C of the present embodiment configured as described above, as shown in the drawing, the screw can be reliably held, and smooth screw tightening work can be easily performed.

[ example 8 ]

Fig. 15 shows another embodiment of the guide passage into which the elastic piece provided with the screw-holding type screwdriver bit 10 of the present invention is inserted. That is, in the present embodiment, when the screw-holding type driver bit 10 according to embodiment 1 is assembled, the flat blade portion 12 and a part of the rotary shaft 11 extending from the flat blade portion 12 are cut off in the bit axial direction with respect to any one of the flat blade portions 12, and the elastic piece 18 having the screw holding function is inserted and arranged into the guide passage 22 by the interaction of the flat blade portion 12 fitted into the fitting groove 32 in contact with the elastic screw head portion 30a with respect to the cut-off portion 15 ″ of the flat blade portion and the continuous rotary shaft 11, and the guide passage 22 into which the elastic piece is inserted and arranged is constituted by the partially bent formed portion 21 of the protective sleeve 20 fitted around the outer periphery of the rotary shaft 11 around the flat blade portion 12 and the elastic piece 18.

By configuring the guide passage 22 into which the elastic piece 18 is inserted, the elastic piece 18 having a screw holding function can be easily attached.

[ example 9 ]

Fig. 16 and 17 show another embodiment of the guide passage into which the elastic piece provided with the screw-holding-type screwdriver bit 10 of the present invention is inserted. That is, in this embodiment, when the screw-holding-type driver bit 10 according to embodiment 1 is assembled, the flat blade portion 12 and the extended rotary shaft 11 are partially cut off in the bit axial direction with respect to any one of the flat blade portions 12, and the inverted U-shaped elastic piece holding pin 24 is attached to the cut-off portion 15' of the flat blade portion and the continuous rotary shaft 11, thereby forming the guide passage 22 into which the elastic piece is inserted and arranged, and the elastic piece 18 having the screw holding function is inserted and arranged into the guide passage 22 by the interaction with the flat blade portion 12 that is fitted into the fitting groove 32 by being in elastic contact with the bit fitting groove 32 of the screw head 30 a.

By configuring the guide passage 22 for inserting and disposing the elastic piece 18 in this manner, the elastic piece 18 having the screw holding function can be easily attached.

[ example 10 ]

Fig. 18 shows still another embodiment of the screw-holding-type screwdriver bit according to the present invention, that is, the screw-holding-type screwdriver bit 10 according to each of the above-described embodiments has a configuration in which a screw holding sleeve 40 surrounding a screw head 30a of a screw 30 held by the flat blade portion 12 and the elastic piece 18 is attached to an outer periphery of the rotary shaft 11 in which the elastic piece 18 having a screw holding function is inserted and arranged in the elongated slot 16 by a coil spring 42 so as to be elastically biased in the bit axial direction. The screw retaining sleeve 40 is

As described above, in the screw-holding-type driver bit 10 of the present embodiment having the above-described configuration, as shown in fig. 18, the tip portion of the screw holding sleeve 40 is pressed from above around the screw heads 30a of the plurality of desired screws 30 arranged and suspended on the screw bracket 44, and in a state where the screw heads 30a are positioned and held by the screw holding sleeve 40, the tip portion 12a of the flat blade portion 12 and the tip portion 18a of the elastic piece 18 of the screw-holding-type driver bit 10 are smoothly and reliably fitted into the bit fitting groove 32, and the screw holding operation can be completed quickly. When the screw held in the screw holding operation is moved to a desired screw mounting object, the screw 30 held by the tip portion 12a of the flat blade portion and the tip portion 18a of the elastic piece 18 of the screw holding type screwdriver bit 10 is held by being surrounded by the screw holding sleeve 40, and can be safely and reliably moved to the screw mounting object.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various configurations and methods can be adopted such as the shape and size of the elastic piece and the structure of the guide passage for inserting the elastic piece, and various design changes can be made without departing from the scope of the claims of the present invention.

(effect of the invention)

As apparent from the above-described embodiments, the screw holding type driver bit according to the present invention is a screw holding type driver bit in which a plurality of flat blade portions each having a substantially vertical end edge portion are provided at a tip end portion thereof, a center portion of a tip end of each of the flat blade portions is formed by a conical projection, the flat blade portion is cut along a bit axial direction with respect to any one of the flat blade portions, a long groove having a desired length as a guide passage is formed in a rotating shaft portion extending substantially continuously from a cut portion of the flat blade portion, and an elastic piece having a screw holding function is inserted and held in the long groove by an interaction with the flat blade portion elastically contacting the screw head bit fitting groove and fitted into the bit fitting groove The screw tightening work is performed quickly, and the screw holding type screwdriver bit which significantly improves the work efficiency can be obtained.

Further, according to the screw holding type driver bit of the present invention, the flat blade portion is cut along the bit axial direction with respect to the flat blade portion of the driver bit, and the long groove having a desired length is engraved, and the elastic piece having the screw holding function is inserted and arranged in the long groove. Further, since the flat blade portion at the tip of the driver bit is fitted when holding the screw, the above-mentioned pressing elastic force of the elastic piece is used only, and therefore, it is not necessary to use the attraction force by the conventional magnet, air, or the like at the same time, and a reliable and stable screw holding function can be exhibited.

Further, according to the combination of the screw-holding type driver bit and the screw of the present invention, since the flat blade portion and the elastic piece of the driver bit are directly fitted into the bit fitting groove of the screw to exhibit a reliable screw holding function, the turning force of the driver bit can be smoothly transmitted to the screw without causing a separation phenomenon or a breakage of the screw, and the screw tightening operation can be normally and rapidly completed with an appropriate torque. Further, the object to which the screw made of various soft and hard materials is attached can be reliably screwed with an appropriate torque, and the screw breakage can be greatly reduced, and the safety and workability of the screwing operation can be easily and economically improved.

Claims (6)

1. A screw-retaining driver bit having a plurality of flat blade portions formed with substantially perpendicular end edge portions at the tip of a rotating shaft portion of a tip portion, the screw-retaining driver bit being suitable for a screw having a bit fitting groove formed in a cross, triangle, or deformed hexagonal shape at the head, the screw comprising:

a cut-out portion (15, 15') formed by cutting out a part of one of the plurality of flat blade portions in the direction of the blade axis;

a long groove (16) formed by cutting a part of the rotating shaft part from the cut-out part to a predetermined length on an extension line thereof;

a protective sleeve (20) which is attached to surround the outer circumference of the rotating shaft forming the long groove in a state in which a part of the tip of the flat blade section is exposed; and

an elastic piece (18) which is arranged between the cut-off part of the flat blade part and the long groove on the extension line thereof and the protective sleeve, the front end part of the elastic piece is exposed from the protective sleeve together with the flat blade part, and the elastic piece is inserted and arranged in a position deviated along the circumferential direction relative to the cut-off part;

the long groove is formed to have a width slightly larger than the thickness of the cut flat blade part, and the elastic piece is inserted and arranged by bending a part (18b) in the circumferential direction of the rotating shaft;

the protective sleeve is fitted and fixed by caulking at a rear end portion (20a) attached to the rotating shaft in a notch portion (11a) provided on the outer periphery of the rotating shaft;

the screw is held when the tip end portion of the elastic piece is fitted into the bit fitting groove of the screw by an elastic force acting in a direction opposite to a screwing direction of the screw.

2. A screw-retaining driver bit having a plurality of flat blade portions formed with substantially perpendicular end edge portions at the tip of a rotating shaft portion of a tip portion, the screw-retaining driver bit being suitable for a screw having a bit fitting groove formed in a cross, triangle, or deformed hexagonal shape at the head, the screw comprising:

a cut-out portion (15, 15') formed by cutting out a part of one of the plurality of flat blade portions in the direction of the blade axis;

a long groove (16) formed by cutting a part of the rotating shaft part from the cut-out part to a predetermined length on an extension line thereof;

a protective sleeve (20) which is attached to surround the outer circumference of the rotating shaft forming the long groove in a state in which a part of the tip of the flat blade section is exposed; and

an elastic piece (18) which is arranged between the cut-off part of the flat blade part and the long groove on the extension line thereof and the protective sleeve, the front end part of the elastic piece is exposed from the protective sleeve together with the flat blade part, and the elastic piece is inserted and arranged in a position deviated along the circumferential direction relative to the cut-off part;

the elongated groove is formed to have a width substantially equal to the thickness of the cut flat blade portion, is formed to be offset in the circumferential direction with respect to the position of the cut flat blade portion, and is inserted without bending the elastic piece;

the protective sleeve is fitted and fixed by caulking at a rear end portion (20a) attached to the rotating shaft in a notch portion (11a) provided on the outer periphery of the rotating shaft;

the tip of the elastic piece is fitted into the bit fitting groove of the screw by an elastic force acting in a direction opposite to a screwing direction of the screw, and holds the screw.

3. A screw-retaining driver bit having a plurality of flat blade portions formed with substantially perpendicular end edge portions at the tip of a rotating shaft portion of a tip portion, the screw-retaining driver bit being suitable for a screw having a bit fitting groove formed in a cross, triangle, or deformed hexagonal shape at the head, the screw comprising:

a cut-out portion (15, 15') formed by cutting out a part of one of the plurality of flat blade portions in the direction of the blade axis;

a long groove (16) formed by cutting a part of the rotating shaft part from the cut-out part to a predetermined length on an extension line thereof;

a protective sleeve (20) which is attached to surround the outer circumference of the rotating shaft forming the long groove in a state in which a part of the tip of the flat blade section is exposed; and

an elastic piece (18) which is arranged between the cut-off part of the flat blade part and the long groove on the extension line thereof and the protective sleeve, the front end part of the elastic piece is exposed from the protective sleeve together with the flat blade part, and the elastic piece is inserted and arranged in a position deviated along the circumferential direction relative to the cut-off part;

the elongated groove is formed to have a width substantially equal to the thickness of the cut flat blade portion, is formed to be offset in the circumferential direction with respect to the position of the cut flat blade portion, and is inserted without bending the elastic piece;

the protective sleeve is fitted and fixed by caulking at a rear end portion (20a) attached to the rotating shaft in a notch portion (11a) provided on the outer periphery of the rotating shaft;

the elastic piece is provided with a locking protrusion (19B) which is locked with a locking groove (17B) which is arranged corresponding to the rear end part of the elastic piece and is vertical to the direction of the long groove;

the tip of the elastic piece is fitted into the bit fitting groove of the screw by an elastic force acting in a direction opposite to a screwing direction of the screw, and holds the screw.

4. A screw-retaining driver bit having a plurality of flat blade portions formed with substantially perpendicular end edge portions at the tip of a rotating shaft portion of a tip portion, the screw-retaining driver bit being suitable for a screw having a bit fitting groove formed in a cross, triangle, or deformed hexagonal shape at the head, the screw comprising:

a cut-out portion (15, 15') formed by cutting out a part of one of the plurality of flat blade portions in the direction of the blade axis;

a long groove (16) formed by cutting a part of the rotating shaft part from the cut-out part to a predetermined length on an extension line thereof;

a protective sleeve (20) which is attached to surround the outer circumference of the rotating shaft forming the long groove in a state in which a part of the tip of the flat blade section is exposed; and

an elastic piece (18) which is interposed between the cut-out portion of the flat blade portion and the elongated slot on the extension thereof and the protective sleeve, the distal end portion of which is exposed from the protective sleeve together with the flat blade portion, and which is disposed so as to be shifted in position in the radial direction with respect to the cut-out portion;

the long groove is formed to have the same width as or slightly wider than the thickness of the cut flat blade part, and the elastic piece is inserted into the long groove by bending a part (18a) in the radial direction of the rotating shaft;

the protective sleeve is fitted and fixed by caulking at a rear end portion (20a) attached to the rotating shaft in a notch portion (11a) provided on the outer periphery of the rotating shaft;

the tip of the elastic piece is fitted into the bit fitting groove of the screw by an elastic force acting in a radial direction of the screw, and holds the screw.

5. A screw-retaining driver bit having a plurality of flat blade portions formed with substantially perpendicular end edge portions at the tip of a rotating shaft portion of a tip portion, the screw-retaining driver bit being suitable for a screw having a bit fitting groove formed in a cross, triangle, or deformed hexagonal shape at the head, the screw comprising:

a cutting part (15') which is formed by cutting a part of one of the plurality of flat blade parts along the direction of the blade shaft and cutting a part of the rotating shaft part of the blade by a predetermined length from the cut flat blade part;

a protective sleeve (20) which is mounted to surround the outer circumference of the rotary shaft forming the cut-out portion in a state in which a part of the tip of the flat blade portion is exposed; and

an elastic piece (18) which is interposed between the flat blade portion and the cut-out portion on the extension line thereof and the protective sleeve, the front end portion of which is exposed from the protective sleeve together with the flat blade portion, and which is disposed so as to be shifted in position in the circumferential direction with respect to the cut-out portion;

bending a portion of a protective sleeve mounted on the outer periphery of the rotary shaft so as to surround the flat blade section and the elastic piece to form a bent portion (21) and form a guide passage (22) for inserting and disposing the elastic piece;

the protective sleeve is fitted and fixed by caulking at a rear end portion (20a) attached to the rotating shaft in a notch portion (11a) provided on the outer periphery of the rotating shaft;

the tip of the elastic piece is fitted into the bit fitting groove of the screw by an elastic force acting in a direction opposite to a screwing direction of the screw, and holds the screw.

6. A screw-retaining driver bit having a plurality of flat blade portions formed with substantially perpendicular end edge portions at the tip of a rotating shaft portion of a tip portion, the screw-retaining driver bit being suitable for a screw having a bit fitting groove formed in a cross, triangle, or deformed hexagonal shape at the head, the screw comprising:

a cutting part (15') which is formed by cutting a part of one of the plurality of flat blade parts along the direction of the blade shaft and cutting a part of the rotating shaft part of the blade by a predetermined length from the cut flat blade part;

a protective sleeve (20) which is mounted to surround the outer circumference of the rotary shaft forming the cut-out portion in a state in which a part of the tip of the flat blade portion is exposed; and

an elastic piece (18) which is interposed between the flat blade portion and the cut-out portion on the extension line thereof and the protective sleeve, the front end portion of which is exposed from the protective sleeve together with the flat blade portion, and which is disposed so as to be shifted in position in the circumferential direction with respect to the cut-out portion;

a cut-out portion in which an inverted U-shaped holding pin (23) is provided to hold a part of the elastic piece, thereby forming a guide passage (24) into which the elastic piece is inserted and arranged;

the protective sleeve is fitted and fixed by caulking at a rear end portion (20a) attached to the rotating shaft in a notch portion (11a) provided on the outer periphery of the rotating shaft;

the tip of the elastic piece is fitted into the bit fitting groove of the screw by an elastic force acting in a direction opposite to a screwing direction of the screw, and holds the screw.