JP2003311641A - Screw holding attachment for driver bit and driver bit mounting it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hexalobular type driver bit attachment having a small size, temporarily holding a screw and assembled to hardly cause mixing-in of an unnecessary metal piece to a machine. <P>SOLUTION: A screw holding attachment 1 for a driver bit is formed by a hexalobular driver bit 10 having a peripheral groove on the outer periphery of a shaft near a screw engagement part and a non-magnetic sleeve 11 having a removable engagement part and a magnet 12 fixed to the tip of the attachment. This attachment engages a screw with the driver bit and holds the same by the magnetic force of the magnet while the hexalobular type screw 15 is in the free state, and has a simple structure, so that it can be reduced in size so as to enable screw fastening in a narrow place. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driver bit attachment capable of holding a screw having a hexalobular type engaging hole at the tip of a driver bit,
Regarding the driver bit with attachment.

[0002]

2. Description of the Related Art A screw having a hexalobular type engaging hole in a screw head, that is, a hexalobular type screw has an advantage that it does not come out as compared with a cross screw having a cross engaging hole. Is expected to increase the use of hexalobular screws. Figure 6
The hexalobular screw 15 shown in (A) is composed of a screw head portion and a screw shaft portion 75, and the screw head portion 70 is provided with a hexalobal engagement hole 71 having six protrusions 72. . FIG. 6B shows a hexalobular type driver bit 10 to which the screw 15 is fastened, and six hexagonal shaft portions 85 of the driver bit 10 are provided with six recesses 83 evenly to form six protrusions 82. The cross-sectional shape of the driver bit tip portion 80 is hexalobal. When the screw 15 and the driver bit 10 are engaged, the protruding portion 72 of the screw engaging hole 71 is attached to the protruding portion 82 of the driver bit tip portion 80.
Fit together and transmit rotational torque. In addition to the advantage that the hexalobular screw and driver bit do not come out easily, the bit has excellent durability and torque transmission is good, so no extra force is required for rotation and the screw groove is not easily damaged. Have.

However, since the hexalobular type screw is less likely to bite with the tip of the driver bit, the screw wobbles when the screw is screwed into an object, causing a screw fastening failure. Therefore, until the screw is screwed into the fastening object to a certain extent and the screw does not wobble,
Although the method of temporarily holding the screw with a finger or the like has been adopted, it has been a cause of deteriorating work efficiency and lengthening the fastening time.

In order to solve the above problem, there is a screw fixing attachment which can temporarily fix a screw to the tip of a driver bit before mechanically tightening the screw and mechanically hold the screw before tightening. .

The conventional attachment shown in FIG. 5 comprises a front tubular body 50 and a rear tubular body 51, each having a through hole so that the rear tubular body 51 can slide into the through hole of the front tubular body 50. The rear tubular body 51 is pushed forward with respect to the front tubular body 50 by the spring 55. At the tip of the front tubular body 50, there is a thick portion 64 having an increased thickness in the outer peripheral direction, and at the thick portion 64, a screw fixing portion 60 for temporarily fixing the head of the screw to be tightened.
Is equipped with. A driver bit fixing portion 62 is provided on the inner periphery of the through hole of the other rear tubular body 51.

In this conventional attachment, the screw fixing portion 60 has a taper hole 65 formed in the thick portion 64 at the front end of the front tubular body 50 along the diametrical direction.
And a metal ball 53 having a diameter that protrudes from the tapered hole 65 to the inner circumference but does not pass through,
O-ring 54 that presses the inner peripheral direction and taper hole 65
And an O-ring groove 63 in which the O-ring 54 is installed across the opening at the outer periphery of the. In the screw fixing portion 60, the metal ball 53 is put in each taper hole 65, and the O ring groove 63
It is configured by fitting the ring 54. On the other hand, the driver bit fixing portion 62 formed on the inner circumference of the through hole of the rear tubular body 51 is composed of a circumferential groove 61 and an O-ring 54 installed in the circumferential groove, and is provided on the outer circumference of the shaft of the driver bit 10. The groove 18 is fixed by engaging the O-ring 54.

In FIG. 5, when using this attachment, the head of the screw is inserted from the tip of the front tubular body 50 and fixed by the screw fixing portion 62, and the tip of the driver bit and the screw head are inside the through hole. Can be temporarily held by engaging with the cross hole. At the time of screwing, the screw 40 is rotated by the rotation of the driver bit 10 to screw the screw into the object.
When the screw is screwed in, the end face 58 of the front tubular body 51 is screwed into the screw 4.
When 0 is brought into contact with an object to be screwed, and further pressed and tightened, the rear tubular body 51 advances into the front tubular body while compressing the spring 55. With the progress, screw 4
The 0 head is gradually pushed outward from the front tubular body. When the screw 40 is completely tightened, the head of the screw 40 is released from the screw fixing portion 60 and is detached from the attachment.

[0008]

The conventional attachment 5 as described above can be used only for a screw having a screw head thickness enough to fit between the screw fixing portion 60 and the rear tubular body 51. It could only be used for a screw having a screw head diameter smaller than the inner diameter of the tubular member 50 and large enough to be fixed by the metal ball 52 of the screw fixing portion 60. It was necessary to prepare multiple attachments in order to support various head-shaped screws.

Further, in the conventional attachment, since the position of the O-ring 54 for fixing the driver bit cannot be changed, it is possible to support a plurality of types of driver bits having different lengths from the driver bit circumferential groove 18 to the tip. I couldn't, and I had to prepare multiple attachments for this.

Further, in the conventional screw fixing attachment 5, since the outer diameter of the thick portion 60 is as large as 2-3 times the shaft diameter of the driver bit 10 or more, it is used to screw the screw into a narrow gap or the like. could not.

Since the conventional attachment 5 has a mechanical structure, its structure is complicated, requires a large number of parts, and is expensive.

As an improvement of such a conventional mechanical attachment, a driver bit made of a magnet, a steel driver bit having a magnetic attachment, etc. may be considered. If these are used, the screw can be fixed to the tip of the driver bit by magnetic force, but in addition to the screw intended to be held, other screws or other metal pieces are attracted to the shaft of the driver bit. . When such a magnetized driver bit is used in an automated assembly line, metal pieces adhering to the driver bit shaft may get mixed into the assembly parts. Was difficult.

An object of the present invention is to provide a screw holding attachment which can be applied to a plurality of types of driver bits and which can be used for a hexalobular type screw having various screw head shape dimensions with one attachment.

Another object of the present invention is to provide a screw retaining attachment that is smaller than conventional mechanical attachments, has a simpler construction, and is applicable to hexalobular screws.

Another object of the present invention is to provide a screw holding attachment capable of selecting and holding only a target screw without magnetizing a shaft portion of a driver bit.

[0016]

The attachment of the present invention is an attachment which can be detachably attached to the tip of a driver bit having a circumferential groove in a shaft portion to temporarily hold a hexalobular screw, but the attachment is A cylinder made of a non-magnetic material that has a hollow part into which the shaft part of the driver bit can be inserted, a ring-shaped magnet that is fixed to the tip opening of the cylinder and can insert the tip part of the driver bit, and the hollow part of the cylinder. Attaching and detaching the peripheral groove of the driver bit shaft portion and the rubber elastic ring, which are formed by one or more peripheral grooves formed on the inner circumference of the portion and a rubber elastic ring fixed to the peripheral groove, and are inserted into the cylindrical body. And an engaging portion for a driver bit that is fixed as much as possible. The tubular body includes an insertion opening for inserting a driver bit into the rear end opening of the hollow portion and a projecting opening through which the tip of the driver bit projects at the front end opening. The ring-shaped magnet is provided on the inner circumference of the hollow part of the cylindrical body and is fixed near the projecting opening of the cylindrical body.

In this attachment, the hexalobular screw is attracted by the magnet and temporarily held in a state of being engaged with the tip of the driver bit. Further, after tightening the screw, it can be easily separated from the driver bit.

In the attachment of the present invention, the screw head can be attracted and held by the magnet regardless of the thickness of the screw head and the diameter of the screw head, so that one attachment can handle various screw head shapes. Further, since the position of the engaging portion of this attachment is determined by the position of the circumferential groove provided on the inner circumference of the hollow portion of the tubular body, it is 1
One attachment can support multiple types of driver bits.

In the attachment of the present invention, the ring-shaped magnet is simply fixed to the opening of the tip of the cylindrical body, and the screw head is attracted and held by the magnet, so that a mechanical screw holding mechanism is formed. There is no need to do it, and it is possible to make a simple attachment with a small diameter. Further, since the attachment constituent members are inexpensive and the number of constituent parts is small, the cost is lower than that of the conventional attachment.

Since the attachment of the present invention does not magnetize the shaft of the driver bit itself nor the cylinder of the attachment itself, the shaft or the cylinder of the attachment attracts other screws or other metal pieces. Less is.

The attachment of the present invention can be provided in combination with a driver bit, in which case it can be used immediately by mounting it on a driver driving device as shown in FIG. The attachment that engages the driver bit can be removed and reattached if desired.

Here, the driver bit includes one in which an engaging end portion which engages with a hexalobular screw is provided at one end or both ends, and the driver bit is pushed into and fixed to the driver device. It also includes a manual screwdriver bit with a fixed handle at the end.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION A cylindrical body of a screw holding attachment for a hexalobular type screw of the present invention carries a ring-shaped magnet in a tip opening portion, and when a tip portion of a driver is inserted, a ring-shaped magnet is inserted inside the ring-shaped magnet. It is arranged to project.
Such a cylinder is preferably cylindrical.

Since the tubular body is made of a non-magnetic material, it is not magnetized by the magnet fixed to the tip of the tubular body, and the risk of attracting other screws or other metal pieces to the outer periphery of the attachment is reduced. Such non-magnetic materials include polymers,
Among ceramics and metals, aluminum, copper and alloys thereof, stainless steel and the like are used. It also includes providing a circumferential groove or an appropriate step portion on the outer circumference of the cylindrical body to prevent the fingers from slipping when the attachment is attached to or detached from the driver bit.

The ring-shaped magnet is fixed to the opening of the projecting opening of the cylindrical body in such a direction that the tip of the hexalobular type driver bit can be inserted into the hole.
The head of the magnetic screw is attracted to the projecting opening side of the cylindrical body for temporary holding. It is preferable that the ring-shaped magnet be embedded in the inner peripheral side of the opening portion of the projecting port because the outer side of the magnet is surrounded by the non-magnetic material. In the attachment of the present invention arranged as such, the magnetic force of the magnet does not substantially act on the outer circumference of the cylindrical body, and it becomes difficult to extend to areas other than the head of the target screw, and sucks other screws or metal pieces. You can be less afraid.

Since the ring-shaped magnet can obtain a magnetic force enough to stably hold the screw head even if the wall thickness is thin, it is useful for keeping the outer peripheral size of the attachment small. Further, when a plurality of magnets are fixed to the tip of the attachment, fixing work and position adjustment are performed for each magnet, but if a ring-shaped magnet is used, fixing is performed only once, so the work process is simplified. And has the effect of shortening the time.

The engaging portion which is detachably engaged with the driver bit communicating with the hollow portion of the tubular body is provided on the inner circumference of the tubular body.
One or two or more peripheral grooves and a rubber elastic ring fitted in the peripheral groove are formed, and the inner surface side of the rubber elastic ring is fitted in the peripheral groove provided on the outer periphery of the shaft portion of the driver bit. The rubber elastic ring is an annular body exhibiting rubber-like elasticity, such as an O-ring. A part of the rubber elastic ring mounted on the cylindrical body projects to the inner peripheral surface of the hollow portion of the cylindrical body, and therefore, the rubber elastic ring is detachably engaged with the peripheral groove of the shaft portion of the driver bit. Although only one peripheral groove may be formed on the inner periphery of the driver bit cylinder, a plurality of peripheral grooves may be formed. When the position of the circumferential groove differs depending on the type of driver bit used, the circumferential groove on which the rubber elastic ring is mounted can be changed, and a single attachment can handle a plurality of types of driver bits.

If a plurality of circumferential grooves are formed in the hollow portion of the tubular body, it can be applied to a plurality of types of driver bits.
If the number of circumferential grooves increases, the attachment becomes longer and it is difficult to attach and detach. It is preferable that two circumferential grooves be formed depending on the length of the attachment, the type of driver bit that is often used, and the like.

FIG. 7 shows an example of a hexalobular screw which is held by using the attachment of the present invention. The material of these screws is a ferromagnetic material that is attracted to the magnet.
The types of screws are widely applicable to machine screws, bolts, bolts with holes, and other screws. The shape of the screw head is shown in Fig. 7.
(A) pan screw, (B) truss screw, (C) round countersunk screw, (D) countersunk screw, etc.
Head shapes such as heads having different thicknesses, for example, FIG. 7 (E)
Even a thick screw such as a flanged hexagon bolt can be held by the hexalobular type driver bit by this attachment.

The engaging portion provided on the cylindrical body is such that the tip of the driver bit for holding the hexalobular screw is projected from the projecting opening of the cylindrical body and fitted into the engaging hole of the head of the screw. Are positioned and placed. On the other hand, when the hexalobular screw is engaged with the tip of the driver bit, the engaging portion is preferably arranged so that the peripheral edge of the screw head comes into annular contact with the attachment tip. Is attracted by the magnet and comes into contact with the opening of the cylindrical body, and can be held stably. It is preferable to provide play in the engagement between the driver bit engaging portion and the groove of the driver bit, the hexalobular screw sufficiently engages with the tip of the driver bit, and the screw head is in the cylindrical opening. Placed in contact. Such play is
By setting the width of the peripheral groove on the driver bit side appropriately, it is possible to move the attachment slightly forward and backward with respect to the driver bit, and finely adjust the positional distance between the attachment cylinder opening and the screw head. it can.

In order to improve the contact between the tip end surface of the attachment and the screw heads of various shapes, the inner peripheral portion of the circumscribed surface 91 of the ring-shaped magnet is chamfered to form an annular taper portion, as shown in FIG. It is preferable to provide 90. Hexalobular type screw head 70, like the flat head screw in Fig. 7 (D).
Is a flat screw or the hexagonal bolt type of Fig. 7 (E),
The flat circumscribing surface 91 of the ring-shaped magnet 12 comes into contact with the screw head 70, and the rounded edge screws such as the round head machine screw of FIG. 7C and the truss machine screw of FIG. In the case of a screw having rounded edges such as a pan head machine screw of (A), the tapered portion 92 of the ring-shaped magnet 12 contacts the screw head 70,
Hold each screw 15 in a stable manner.

When using the attachment of the present invention, the hexalobular type driver bit with the attachment is fixed to the driver driving device. When the driver bit tip protruding from the attachment protrusion is engaged with the hexalobular type engaging hole of the screw head that was properly held, the magnet fixed to the attachment tip attracts the hexalobular type screw by magnetic force. . The screw is carried to the screwing position while being held by the driver driving device to the driver bit, and then screwed by the driver bit rotated while being pressed by the driver driving device. When screwing is completed and the driver bit is moved in a direction away from the target object, the screw is already fixed to the target object and is removed from the driver bit. Then, the next screw can be held at the tip of the driver bit and similarly screwed into the object.

An attachment mounting driver bit which is a combination of the screw holding attachment and the driver bit will be described. As described above, there is a preferable positional relationship between the hexalobular type driver bit and the attachment.Therefore, after obtaining the attachment, adjust the position of the driver bit engagement part according to the type of hexalobular type driver bit to be used. It may be necessary. However, in the attachment-installed driver bit, the position of the engaging portion for the driver bit is already adjusted, so that it can be used immediately after being obtained. Since the attached attachment is detachable, when the driver bit of the attachment attachment driver bit is damaged and cannot be used, the attachment can be removed and attached to another driver bit. If the attachment is damaged,
The attachment can be removed and used as a normal hexalobular type driver bit, or only the attachment can be newly obtained and attached.

[0034]

FIG. 1 shows an embodiment of the present invention. The cylindrical body 11 is a cylindrical body formed of non-magnetic synthetic resin, and the hollow portion is also cylindrical and has a diameter such that a driver bit can be inserted therethrough. A circumferential groove 13 is formed in the inner periphery of the hollow portion of the cylindrical body, and a magnet 12 is fitted in the inner periphery of the distal end opening of the cylindrical body 11. The magnet 12 has a ring shape, and is fitted into a step portion on the inner peripheral side formed for fixing the magnet in the distal end opening portion of the cylindrical body 11. In this example, the inner periphery of the ring is almost the same as the hollow portion of the cylindrical body. The ring is held coaxially with the same diameter, and the outer circumference of the ring is covered with the thin portion of the cylindrical body 11. An O-ring 14 is fitted in the rear circumferential groove 13 so that the inner circumference of the O-ring 14 engages with the circumferential groove 18 of the driver bit inserted in the hollow portion, as shown in FIG. 2 (A). Then, the driver bit engaging portion is formed.

In the attachment 1 of the present invention thus formed, the driver bit 10 is inserted in the hollow portion 11
When it is inserted from 7, the outer periphery of the hexagonal cross section of the driver bit is pushed in while expanding the O-ring, and enters.
As shown in (A), the O-ring 14 is fitted in the concave portion of the circumferential groove 18, and the attachment is placed on the driver bit. In this state where the attachment 1 is engaged with the driver bit 10, the tip portion 19 of the driver bit is projected from the projection 16 or is in a state of looking into the projection 16.

The hexalobular type driver bit 10 equipped with the attachment is attached to the shaft hole of the rotary shaft of the driver driving device, and when the tip portion 19 of the driver bit is engaged with the head hole of the hexalobular type screw 15, the screw is generated by the magnetic force. Are held in engagement with the driver bit tip 19. Figure 2 (B) with the screw held
As shown in FIG. 5, the peripheral portion of the screw head 70 contacts the tapered inner peripheral surface of the ring-shaped magnet 12 in an annular shape, so that the screw can be stably held without wobbling. The screw held at the tip of the driver bit is transported to the fastening point,
Then, it is rotated while being pressed by the driver bit and screwed into the object. When the screwing is completed, the screw is fixed to the object, so that the screw comes off the driver bit. Although the metal pieces of the magnetic material were scattered within the moving range of the driver bit, they were hardly attached to the attachment 1 and the driver bit 10.

FIG. 3 shows a modification of the above embodiment, but is an example in which two rows of driver bit engaging peripheral grooves 13, 13 are provided on the rear side of the hollow portion of the cylindrical body 11. This allows
From the tip portion 19 of the driver bit 10 to the circumferential groove 18 of the driver bit 10, it is possible to mount corresponding to two types of driver bits having different lengths. Driver bit 10 to use
Corresponding to the above, the O-ring can be used by being fitted into either the front or rear circumferential groove 13.

[0038]

The screw holding attachment of the present invention comprises a tubular body that can be detachably engaged with the driver bit and a magnet fixed to the tip of the tubular body. The magnetic force of the magnet engages the screw with the driver bit. Since the screw is held in this state, the screw does not wobble when the hexalobular type screw is fastened, and the screw can be stably screwed in without temporarily holding it with a finger or the like, so that the working time can be shortened. In addition, the screw can be temporarily held on the driver bit at a position away from the object to be fastened, and the screw does not fall off even if the driver bit is changed in direction, so it is screwed in a gap where fingers cannot be inserted, and screwed sideways or downward. However, fast and reliable fastening can be achieved.

Further, since the cylinder of the attachment is non-magnetic, the attachment itself is not magnetized, so that there is less risk of attaching metal pieces. In particular, if the magnet is fixed to the inner peripheral side of the distal end opening of the cylindrical body, the range of magnetism is further reduced, so that the possibility of attaching metal pieces is further reduced.

As an engaging portion for a driver bit provided in the attachment, a peripheral groove on the inner circumference of the attachment,
If an engaging means composed of an O-ring fitted in the circumferential groove is used,
Since the only component is the O-ring, it can be manufactured easily and the raw material cost can be reduced. In such an engaging portion, a plurality of circumferential grooves on the inner circumference of the attachment can be formed. Therefore, by changing the position of the circumferential groove to which the O-ring is fixed, it is possible to handle a plurality of types of driver bits.

Since the tubular body can be made small in diameter and small in size and is much more compact than the attachment of the conventional mechanical screw holding mechanism, it can be used for transporting and fastening screws to a narrow place.

The present invention is an attachment mounting driver bit in which the above-mentioned screw holding attachment is mounted on a hexalobular type driver bit, which can be designed and formed so that the attachment and the driver bit are engaged at an optimum position. .

[0043]

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a screw holding attachment according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view (A, B) of a tip end portion of a hexalobular type driver bid equipped with a screw holding attachment according to an embodiment of the present invention.

FIG. 3 shows a modification of the screw holding attachment according to the embodiment of the present invention.

FIG. 4 is a view showing a mode of using the attachment-installed driver bit according to the embodiment of the present invention.

FIG. 5 is a schematic sectional view of a conventional screw holding attachment.

FIG. 6 shows a front view and side view (A) of a hexalobular screw and a front view and a side view (B) of a hexalobular driver bit.

FIG. 7 shows a front view and a side view of each screw of a hexalobular screw (A to E) to which the attachment of the present invention can be applied.

[Explanation of symbols]

1 attachment 10 Hexalobular Driver Bit 11 cylinder 12 ring magnet 13 circumferential groove 14 O-ring 15 Hexalobular screw 18 Driver bit circumferential groove 19 Driver Bit Tip 70 Hexalobular Screw Head 71 Hexalobular type engagement hole

Claims (4)

[Claims] 1. An attachment for temporarily holding a head of a hexalobular screw at the tip of a driver bit having a circumferential groove formed on the outer circumference of the shaft, the attachment being capable of inserting the shaft portion of the driver bit. A tubular body made of a non-magnetic material with a hollow portion, a ring-shaped magnet fixed to the tip opening of the tubular body and into which the tip portion of the driver bit can be inserted, and 1 formed on the inner circumference of the hollow portion of the tubular body. One or two or more peripheral grooves and a rubber elastic ring fixed to the peripheral grooves, and an engagement for detachably engaging the peripheral groove of the driver bit shaft portion inserted into the cylindrical body with the rubber elastic ring. A screw holding attachment for a driver bit, which is configured to hold the screw at the tip of the driver bit by sucking the head of the screw with the magnet. 2. The screw holding attachment according to claim 1, wherein the magnet is embedded in the inner circumference of the tip of the attachment. 3. The screw holding attachment according to claim 1, wherein two peripheral grooves on the inner circumference of the attachment are formed, and a rubber elastic ring is installed in one of the peripheral grooves. 4. An attachment-installed driver bit formed by detachably engaging the screw holding attachment according to any one of claims 1 to 3 and a driver bit having a circumferential groove on the outer circumference of the shaft near the screw engaging portion.