JPH09174447A - Nut fastening attachment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform conversion of a box with a plus or a minus bit through further simple operation, in an attachment attached to the tip part of a plus or a minus driver to use it as a box driver. SOLUTION: A nut fastening attachment is provided with a square through- hole 5 is formed coaxially with the end situated deep of a box recess 4 to hold a nut and a retractable lock piece 7 to lock axial movement of a driver shaft axially slidably inserted in the square through-hole. A slidable operation ring 8 is arranged at the cylindrical part of the outer periphery of the square through-hole 5. The operation ring is provided on an inner circumference with a taper part 15, and through wedge operation when the operation ring 8 is relatively moved, the rock piece 7 is pushed in such a manner to protrude from the inner peripheral surface of the square through-hole 5. By moving a nut fastening attachment 21 to the root side of a driver shaft, a plus or a minus driver bit is protruded from the box recess 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut tightening attachment to be mounted on a shaft of a driver, and by mounting the driver on a tip portion of a plus driver or a minus driver, the driver is attached to a nut (a bolt head in this specification). It is used in the meaning including)) to be used as a box driver to fasten the attachment.

[0002]

2. Description of the Related Art An example of a conventional nut tightening attachment is shown in FIG. The conventional nut tightening attachment 31
A box recess 4 for accommodating a nut is provided at the large-diameter side end of a cylindrical main body 1 having an outer circumference of two steps, and a bottomed hole 32 for inserting a driver shaft is provided at the small-diameter side end. Has been. A driver shaft to which this type of nut tightening attachment can be attached usually has a hexagonal cross section, and has a circumferential groove 19 near its tip. Therefore,
The bottomed hole 32 into which the driver shaft is inserted is usually a hexagonal hole, and a spring-biased lock piece 7 to be engaged with the circumferential groove 19 of the driver shaft is attached to the inner peripheral surface thereof. The box recess 4 naturally has a cross-sectional shape adapted to the outer diameter of the nut to be tightened, and holds the nut unrotatably and axially movable.

When tightening a nut using this conventional nut tightening attachment, the bottomed hole 32 of the nut tightening attachment is inserted into the tip of the driver being used. When the tip of the driver reaches the bottom of the bottomed hole 32,
The lock piece 7 is engaged with the circumferential groove 19 of the driver shaft, and the nut tightening attachment 31 is held at the tip of the driver so as not to rotate relative to each other by fitting the hexagonal section of the driver shaft and the hexagonal section of the bottomed hole 32. Therefore, the driver can be used as a box driver for tightening the nut. When returning to the original plus driver or minus driver, the nut tightening attachment 31 is pulled out from the tip of the driver.

In an electric tool or an air tool, a chuck 33 in which the base end side of the driver shaft is provided on the drive shaft of the tool
To be fixed. The screwdriver used in this manner has positive or negative (mostly positive) bit tips with different sizes on both ends of the driver shaft. FIG. 5 shows such a driver shaft having bit tips at both ends.

[0005]

By mounting this nut tightening attachment of this type, a plus or minus screwdriver can be used as a box driver, and the attachment and detachment of the attachment can be performed with one touch. Very convenient, especially when tightening screws and nuts, using electric or pneumatic tools. However, if a large number of screws and nuts must be tightened alternately, the nut tightening attachment must be removed and attached frequently, and the removed nut tightening attachment can be put in a pocket or on a nearby table. It is necessary to repeat the operation of placing it, tightening the screw, then picking up the nut tightening attachment, mounting it on the tip of the driver shaft and tightening the nut, and place the removed attachment on the base. Alternatively, the work of picking up the attachment from the table and aligning the tip of the driver shaft with the bottomed hole 32 of the attachment is complicated, and the work efficiency is reduced.

The present invention has been made for the purpose of solving the above-mentioned problems when attachments are frequently attached and detached, and the conversion between the box at the tip of the driver shaft and the plus or minus bit can be performed by a simpler operation. The challenge is to be able to do it.

[0007]

A nut tightening attachment according to a first aspect of the present invention is provided with a box recess 4 for accommodating a nut which is relatively non-rotatable and axially movably housed. The driver shaft 2 is provided with a hole 5 and is axially slidably inserted into the inner peripheral surface of the corner through hole.
It is characterized in that a lock piece 7 that can be retracted and retracted is provided to lock the axial movement of 0.

According to a second aspect of the present invention, in the nut tightening attachment according to the first aspect, the operation ring slidably mounted on the tubular outer periphery of the portion of the corner through hole 5 where the lock piece 7 is provided. 8, the operating ring has a tapered portion 15 on the inner periphery thereof, and the lock piece 7 is moved to the inner peripheral surface of the corner through hole 5 by the wedge action of the tapered portion when the operating ring 8 moves relative to the outer periphery. It is characterized in that it pushes so as to project from the. The tapered portion 15 of the inner diameter of the operation ring can have both a structure that is inclined in the axial direction and a structure that is inclined in the circumferential direction. When tilted in the axial direction, the operating ring 8 slides in the axial direction so that the lock piece 7 appears and retracts. When tilted in the circumferential direction, the operating ring 8 rotates to lock. Piece 7 appears and disappears.

According to a third aspect of the present invention, in the nut tightening attachment according to the second aspect, the operating ring 8 is axially movable with respect to the attachment body 1 and is biased by the spring 16 toward the moving end on the box recess 4 side. And an inner peripheral ridge 13 for restricting the outward movement of the lock piece 7 at the moving end and an inner peripheral groove 14 located on the box recess side of the operating ring 8, This inner ridge 1
The stepped surface between the inner peripheral groove 14 and the inner peripheral groove 14 is a conical tapered surface. It is preferable to provide a spring 16 between the operation ring 8 and the attachment body 1 for urging the operation ring 8 toward the sliding end on the protruding side of the lock piece. This spring prevents unnecessary movement of the operating ring 8 and prevents the nut tightening attachment 21 from coming off the driver shaft 20.

[0010]

According to the first aspect of the present invention, the driver bit 18 can be projected from the box recess 4 by moving it to the base side of the driver shaft 20 without removing the nut tightening attachment 21. It is possible to convert between the box and the plus or minus bit with a simpler operation.

According to the second aspect of the present invention, by operating the operation ring 8, it is possible to easily engage and disengage the driver shaft 20 and the nut tightening attachment 21 by the lock piece 7, and the nut tightening attachment. Two
1 can be attached / detached to / from the driver shaft 20 with one touch.

According to the third aspect of the invention, the nut tightening attachment can be unfixed and the driver shaft can be moved backward to the root portion by a single operation of grasping and pulling the operating ring 8 and the retracted attachment. By pushing the button toward the tip side of the driver shaft, the attachment can be advanced to the mounting position and its fixing operation can be performed.

[0013]

1 shows an embodiment of a nut tightening attachment according to the present invention. The main body 1 of the attachment is a short cylinder having a large-diameter cylindrical portion 2 and a small-diameter cylindrical portion 3, and has a rectangular cylinder (usually hexagonal cylinder) shape that matches the outer diameter of a nut fastened to the large-diameter side end. A box recess 4 is formed. And at the back end of this box recess 4,
A through hole 5 having a smaller diameter (usually hexagonal) cross section than the box recess is provided so as to penetrate to the small diameter side end portion of the attachment body 1. The angular cross section of the through hole 5 has a shape and dimensions that match the cross sectional shape of the driver shaft to which the attachment is attached.

At one axial position of the through hole 5, a taper hole 6 having a slightly larger diameter on the outer peripheral side and opening to the outer peripheral surface on the small diameter side of the attachment main body is provided at a plurality of portions (usually normal). Are provided at three positions), and lock pieces 7 made of steel balls are fitted into the tapered holes. The small-diameter end (through-hole side) of the tapered hole 6 is slightly smaller than the diameter of the lock piece 7, and although the lock piece 7 can project from the peripheral surface of the through-hole 5, it falls off to the through-hole side. There is nothing to do.

In the small-diameter cylindrical portion 3 of the attachment body,
An operation ring 8 is inserted movably in the axial direction, a collar 9 is fitted near the end face of the small diameter cylindrical portion, and is fixed by a stop ring 11. The operation ring 8 is provided with inner peripheral ridges 12 and 13 at an end portion located on the large diameter side of the attachment body at the time of insertion and an intermediate portion in the axial direction.
An inner peripheral groove 14 serving as a clearance space for the lock piece 7 is provided between the second and third portions. The step between the inner circumferential groove 14 and the intermediate inner ridge 13 is a conical tapered portion 15. A side of the inner peripheral ridge 13 opposite to the inner peripheral groove is a cylindrical inner peripheral surface, and the inner peripheral surface of the cylinder, the outer peripheral surface of the collar 9 and the top surface of the inner peripheral ridge 12 at the end and the attachment main body. The small diameter cylindrical portion 3 is in sliding contact. And the collar 9 and the inner peripheral ridge 1 of the middle part
A compression coil spring 16 is interposed in a compressed state between the end surface of the attachment body 3 on the side opposite to the inner peripheral groove side, and the operation ring 8 is elastically pressed to the step portion 17 between the large diameter outer peripheral surface and the inner diameter outer peripheral surface of the attachment body. doing. In this elastic pressure state, the top surface of the intermediate inner ridge 13 becomes the position where the tapered hole 6 is closed, and the lock piece 7
Restrain the movement of the outside of.

Next, the attaching / detaching operation of the nut tightening attachment of this embodiment will be described. The operator grasps the operation ring 8 and inserts the driver bit 18 into the through hole 5. At this time, the lock piece 7 is held in a state of protruding toward the through hole 5, and the lock piece 7 contacts the tip of the inserted driver bit. In this state, the driver bit is prevented from being inserted, and the operator tries to further retract the operation ring. Therefore, the compression coil spring 16 is compressed, the operation ring 8 slides, and the inner peripheral groove 14 is provided outside the lock piece 7.
Will be located. In this state, the lock piece 7
Since it can escape to the outside, it is pushed by the tip of the bit to be recessed, and the driver bit 18 is further inserted into the through hole 5. In this state, the axial frictional resistance force acting on the lock piece 7 is smaller than the biasing force of the compression coil spring 16 (when the frictional force becomes large for some reason, the spring 16 is compressed to release the lock piece. Therefore, the operation ring 8 tries to return by the urging force of the coil spring 16, and the tapered surface 1
By the action of 5, the driver bit 18 is inserted while the lock piece 7 is always pressed to the inner side, that is, the outer periphery of the driver shaft. for that reason,
When the circumferential groove 19 of the driver bit reaches the position of the lock piece 7, the lock piece 7 automatically fits in the circumferential groove 19 and a resistance force against the insertion force is generated. Therefore, when the operator releases the operation ring 8, the nut tightening attachment 21 is attached to the tip end portion of the driver shaft 20 with the lock piece 7 fitted in the circumferential groove 19 of the driver shaft. The axial movement of the mounted nut tightening attachment 21 is blocked by the lock piece 7, and the rotation is blocked by fitting the angular shape of the through hole 5 and the angular shape of the driver shaft.

When returning to the original Phillips screwdriver from this state, the operator grasps the operation ring 8 and pulls it toward the front side (base side of the driver shaft). By this operation, the compression coil spring 16 is compressed and the operation ring 8 slides,
When the lock piece 7 escapes into the inner circumferential groove 14, the axial restraint of the attachment body 1 is released, and the attachment body 1 moves toward the root side of the driver bit. Since the through hole 5 penetrates the bottom of the box recess 4, the attachment body 1 moves to the base side of the driver shaft, and the plus bit of the driver shaft penetrates the attachment body 1 and projects. Will be able to tighten.

When returning to the box driver again, the operator is required to pull the large-diameter cylindrical portion 2 of the nut tightening attachment or the operating ring 8 pulled toward the base side of the driver bit.
When the lock piece 7 reaches the position of the inner circumferential groove 14 at the tip of the driver shaft when the lock piece 7 is moved to the tip side of the driver shaft by grasping (which can be moved more lightly by grasping the large diameter cylindrical portion 2), , The lock piece 7 is the inner circumferential groove 1
4 and the operation ring 8 moves until it comes into contact with the step portion 17 of the attachment body, so that the attachment cannot be moved any further, and the nut tightening attachment 21 cannot move in the axial direction at this position. Fixed to.

That is, in the nut tightening attachment of this embodiment, the fixation of the nut tightening attachment is released and the driver shaft is retracted to the root portion by one operation of grasping and pulling the operation ring 8, and then retracted. One operation of pushing the existing attachment to the tip side of the driver shaft causes the attachment to advance to the mounting position and be fixed in one operation. When removing the nut tightening attachment 21 from the tip of the driver bit, the operation ring 8 may be pulled and the large diameter cylindrical portion 2 of the attachment body may be grasped and the attachment body may be removed from the driver bit.

[0020]

As described above, according to the present invention, when the screw is tightened, the nut tightening attachment is retracted to the base side of the driver shaft so that the driver bit is projected from the box recess. When tightening the nut, the nut tightening attachment is advanced to the tip side of the driver shaft to fix the box recess to the tip of the driver shaft. Therefore, even when a large number of screws and nuts have to be tightened alternately, it is not necessary to perform the work for mounting and removing the nut tightening attachment, and the work efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a nut tightening attachment of the present invention.

FIG. 2 is a cross-sectional view at the time of attachment to a driver shaft.

FIG. 3 is a cross-sectional view after completion of mounting on a driver shaft.

FIG. 4 is a cross-sectional view when tightening the screw with a screwdriver.

FIG. 5 is a perspective view of a conventional attachment mounted on a driver shaft.

[Explanation of symbols]

 1 main body 4 box recess 5 through hole 7 lock piece 8 operating ring 12 inner ridge 13 inner ridge 14 inner groove 15 taper 16 compression coil spring 20 driver shaft 21 nut tightening attachment

Claims (3)

[Claims] 1. An angular through hole (5) coaxial with the box is provided at the rear end of a box recess (4) for accommodating a nut so that the nut cannot be relatively rotated and is movable in the axial direction. Driver shaft (20) that is slidably inserted in the inner peripheral surface
Nut tightening attachment, characterized in that it is provided with a lock piece (7) that can be retracted and retracted to stop the axial movement of the nut. 2. An operating ring (8) slidably mounted on a cylindrical outer periphery of a portion of the square through hole (5) where a lock piece (7) is provided, the operating ring being provided on the inner periphery. The lock piece (7) is provided with a taper portion (15), and the wedge action of the taper portion when the operation ring (8) moves relative to the outer circumference.
The nut tightening attachment according to claim 1, wherein the nut is attached so as to protrude from the inner peripheral surface of the corner through hole (5). 3. The operation ring (8) is the attachment body.
Axial movement to (1) and spring (16) to box recess (4)
Is attached to the moving end of the
Lock piece (7) at the moving end on the inner diameter side of (8)
The inner peripheral ridge (13) for restraining the outward movement of the inner peripheral ridge (13) and the inner peripheral groove (14) located on the box recess side of the box, and between the inner peripheral ridge (13) and the inner peripheral groove (14). The nut tightening attachment according to claim 2, wherein the step surface of the nut is a conical tapered surface.