JPS6331898Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a screwdriver bit that is capable of tightening square nuts in addition to screws with a single bit.

When assembling machines that require screws and square nuts, prepare tightening tools for each.
Alternatively, it is not preferable to replace the tip tightening means of a single tool, as this is not only extremely troublesome, but also reduces work efficiency.

Therefore, it would be extremely useful from a practical standpoint if there were a tool equipped with a tightening means that can be used commonly for these screws and nuts. Therefore, as a shared tool that has these dual-purpose functions, but can be used for different purposes with extremely simple adjustment operations, the applicant of the present application first replaced the box for engaging the square nut with a bit having a cutting edge for engaging the screw head. The assembled screwdriver bit was proposed in Utility Model Registration Application No. 106929 in 1981.

The present invention relates to the improvement of this driver bit, and its purpose is to provide a device configuration that allows the box and bit to be freely interchanged.

The illustrated bit of the present invention will be described in detail below.

In FIG. 1, which shows a side view of an embodiment of the bit of the present invention, 1 is a bit consisting of a square shaft, the tip of which is a cutting edge 2 that engages with a screw head. 3 is a cylindrical body having a square hole, and has a box 4 at its tip that fits into a square nut, and is slidable in the axial direction when the square shaft of the bit 1 is fitted into the square hole. However, it is constructed so that it is integrated in the direction of rotation.

A cylindrical first operation member 5 is provided in the cylinder 3.
is fitted under a state of equilibrium between the spring forces acting from both axial length directions, and the second operating member 6, which is also cylindrical, is engaged with the end of the cylinder body 3 under the action of one of the spring forces. It is fitted in a state in which it is pressed into contact with the mating washer 7. In addition, 8 is a first steel ball as a position regulating member, and 9a and 9b are the first steel balls 8.
In the engagement hole into which the cutting edge 2 falls, the bit position shown by the solid line in the figure protrudes from the edge of the box 4, and the bit position shown by the chain line in the figure where the cutting edge 2 retreats to the deep part of the box 4. The holes are drilled on the bit surfaces separated by the distance of movement between the bits and the base. Further, 10 is a second steel ball as a locking member, and 11 is an outer groove into which the second steel ball 10 is slidably fitted, which is opened in the side surface of the bit 1 by the distance of movement between the two positions. There is.

FIG. 2 is an enlarged vertical cross-sectional view showing the functional components of the first steel ball 8, in which the first operating member 5 has the inner peripheral wall of its cylindrical body connected to the thickest pressing surface 5a. It is processed into a thin wall portion 5b at both ends and a stepped portion 5c that further widens on both sides, and an expansion spring 12 is interposed between one of the stepped portions 5c and the stepped portion 3a of the cylinder 3, and the other stepped portion is A pressure expanding spring 13 is interposed between the end face of the second operating member 6 and the pressing surface 5a, and under a balanced state of the forces exerted by these springs 12 and 13, the pressing surface 5a is pressed against the first steel ball 8. The engaging hole 9 is inserted through the small hole 14 made in the cylindrical body 3.
It is designed to fit into a. This small hole 1
4 has an outer opening diameter of the cylindrical body 3 configured to be large enough to allow the first steel ball 8 to freely enter and exit, and an inner opening diameter configured to be smaller than the diameter of the first steel ball 8. There is.

FIG. 3 is an enlarged vertical sectional view showing the functional component of the second steel ball 10, in which the thick pressing surface 6a of the second operating member 6 is in circumferential contact with the second steel ball 10, and The second operating member 6 is slidably fitted into the outer groove 11 through another small hole 15 bored in the cylinder 3 (shown by chain lines in the figure), and when the second operating member 6 is moved to the left in the figure, It is configured to resist the expansion force of the springs 12 and 13 and retreat together with the first operating member 5 from the area of action on the second steel ball 10, allowing the steel ball 10 to protrude (as shown by the solid line in the figure). There is.
The small hole 15, like the small hole 14 described above, is configured so that the opening diameter on the outside is different from that on the inside.
Reference numeral 16 designates a narrow ring, one end of which is brought into contact with the inside of the stop washer 7, the other end of which faces the outside edge of the small hole 15, and a second steel ball 1 is projected.
It is designed to prevent 0 from falling off.

In the bit of the present invention having such a configuration, the engaging holes 9a, 9b and the outer groove 11 are machined on the square axis surface of the bit 1, while the cylindrical body 3 having the box 4 is first expanded from its small diameter end. Insert the pressing strip 12, then drop the first steel ball 8 into the small hole 14,
Fit the first operating member 5 and insert another expansion spring 13, and then insert the second steel ball 10 into the small hole 15.
After dropping the second operating member 6, the ring 16 is finally inserted and the stop washer 7 is locked to prevent the previously assembled members from coming off, thus completing the assembly.

Here, in order to assemble the box 4 of the cylindrical body 3 which has been assembled, and the bit 1, the second operating member 6 of the cylindrical body 3 is pushed in the upper left direction in FIG. and the pressure expansion spring 12 via the first operating member 5.
is compressed against their expansion forces, and as a result, the second operating member 6 moves to the left and the first operating member 6 moves to the left.
The operating member 5 also moves in the same direction. At this time, the first
The amount of movement of the second operating members 5 and 6 is the same as that of both springs 12,
13, the amount of movement of the second operating member 6 is twice that of the first operating member 5, but in the final state of these movements, the second operating member 6 moves as shown by the solid line in FIG. In the illustrated position, the first operating member 5 is in a state where the thin wall portion 5b shown in the second figure reaches above the first steel ball 8.

While maintaining this state, insert the square shaft bit 1 into each of the first and second holes of the engagement holes 9a, 9b and outer groove 11.
When the steel balls 8, 10 are aligned with the cylinder 3 and inserted into the cylinder 3, the first and second steel balls 8, 10 are pushed outward by the outer wall surface of the bit 1 entering. being pushed towards.

In this way, since the steel balls 8, 10 are no longer pressed from the outside when the first and second operating members 5, 6 are moved to the above-mentioned positions, the steel balls 8, 10 are released from the outside.
The 10 protrudes and retreats from the intrusion area of the bit 1,
The bit 1 can be easily inserted into the cylindrical body 3. Then, when the cutting edge 2 of the bit 1 protrudes from the edge of the box 4, more specifically, the second steel ball 1
When the second operating member 6 reaches the top of the outer groove 11,
When the pressure on the spring 13 is released,
3, the second steel ball 10 is pushed by the thick pressing surface 6a of the member 6 and falls into the outer groove 11. When the bit 1 is further inserted and the engagement hole 9a reaches the position of the first steel ball 8, the steel ball 8 falls into the engagement hole 9a, and from the state where it was held by the first steel ball 8 protruding from the side edge of the pressing surface 5a of the thin portion 5b,
When the pressing is released, the first operating member 5 is moved to the second
The state shown in the figure is obtained.

This causes the first bit between bit 1 and box 4 to
The assembly shown in the figure is completed.

When recombining the bit 1 with a different cutting edge 2 and the cylinder 3 with a different shape of the box 4, the bit 1 is inserted into the cylinder 3 while the second operating member 6 is pressed. Since it can be easily removed, this rearrangement can be carried out at any time.

Furthermore, switching between bit 1 and box 4 during use is achieved by pulling the first operating member 5 in the upper left direction in FIGS. The pressing surface 5a that was in circumferential contact with the first steel ball 8 retreats, the thin wall portion 5b reaches above the steel ball 8, and the pulling action of the member 5 also causes the cylinder 3 itself to move to the left. Since a moving force is applied, this mobility pushes the first steel ball 8 against the hole wall of the engagement hole 9a and raises it, and after that, the cylinder body 3 becomes freely movable to the left in FIG. .

At this time, the second steel ball 10 slides on the outer groove 11 in its pushed position (engaged state), so the cylindrical body 3 slides until the second steel ball 10 reaches the left end of the outer groove 11. At this movement position, bit 1 is
As shown by the chain line in the upper part of FIG.
The locking by the left end of 1 prevents the cylinder 3 from moving leftward thereafter. At various positions of the cylinder 3 in this blocking state, the engagement hole 9b is located below the first steel ball 8, and when the pulling operation on the first operating member 5 is released in this state, the pressure is expanded. Even with the return power of Hatsujo 12,
The member 5 moves in the opposite direction and forces the steel ball 8 into the engagement hole 9b with its pressing surface 5a.

Thus, the first steel ball 8 in circumferential contact with the pressing surface 5a
cannot retreat from the area of engagement with the engagement hole 9b, and as a result, the bit 1 is maintained deep within the box 4, allowing the box 4 to tighten the square nut.

From the usage state of this box 4, the first operating member 5
When pulled to the right, the pressure on the first steel ball 8 is released in the same manner as described above, and the cylinder body 3 can be moved to the right as it is, and the bit 1 shown in the solid line in FIG. The protruding position of the bit 1 can be maintained, and the screws can be tightened using the bit 1.

As described above, according to the bit of the present invention, the cylindrical body having the box as another tightening means that fits into the square nut can be moved with respect to the bit having the cutting edge as the tightening means that engages with the screw. When installing, by holding the cylindrical body against the bit at the position where the cutting edge of the bit fully protrudes from the edge of the box and at the position where it is retracted deep into the box, it is possible to attach screws, square nuts, etc. with a single bit. Two types of tightening work can be easily performed without replacing the bit.

In addition, in the bit of the present invention, in addition to the position regulating member that maintains the moving position, a locking member that normally regulates the movement range is provided, and both the position regulating member and the locking member have their locking action. Since the bits and boxes can be separated by retreating from the area, they can be recombined and converted at any time, and the range of use of the bits of the present invention can be further expanded. The practical benefits are enormous.

In the illustrated embodiment of the bit of the present invention, the two small holes 14 and 15 bored in the cylindrical body 3 have their inner opening diameters reduced to prevent the steel balls 8 and 10 from falling inward (the bit 1). However, if the position regulating member and the locking member are made of a shaft body and the outer end is made of an arcuate head with a large diameter, this head can also be used to prevent it from coming out of the small hole. Since the small hole itself is prevented from falling out, the small hole itself does not require the processing of the illustrated embodiment, and may be a simple through hole.

In addition, in accordance with the intent of the bit of the present invention, it is possible to increase or decrease the number of parts and change the shape without departing from the gist of the bit.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the bit of the present invention, and FIGS. 2 and 3 are longitudinal sectional side views showing enlarged configurations of the main parts of the bit of the present invention. 1... Bit, 2... Cutting edge, 3... Cylindrical body, 4...
...Box, 5...First operating member, 5a...Press contact surface, 5b...Thin wall portion, 6...Second operating member, 6a
... Pressing surface, 8 ... First steel ball, 9a, 9b ... Engagement hole, 10 ... Second steel ball, 11 ... Outer groove, 1
2, 13... Expansion spring, 14, 15... Small hole, 1
6...Ring.

Claims (1)

[Scope of utility model registration request] A bit having a cutting edge for engaging a screw head is attached to a cylindrical body having a box for engaging a square nut at the tip, and a position where the bit protrudes from the edge of the box and a position where the cutting edge retreats deep into the box. A locking member is configured to be movable between the positions and integral in the circumferential direction, and the locking member is exposed through a small hole bored in the cylindrical body to a bit outer groove having a length equal to the movement between the occupied positions. and a position regulating member that faces through another small hole drilled in the cylindrical body into the engagement hole on the outside of the bit corresponding to the above-mentioned position, and these locking members and position regulating members are arranged in their locking action area. and an operating member that leads to the retracting area are respectively disposed on the cylinder body, and the operating member relative to the position regulating member is normally used to selectively use the bit and the box, and both operating members are operated together to switch between the bit and the box. A driver bit characterized in that it is configured to be able to perform separation.