JPS6021179Y2 - Screw-in tool with blade - Google Patents

Description

[Detailed explanation of the invention] This invention is a self-drilling screw, which has a drilling blade at the tip and which drills and threads into the target component and then leaves it behind to tighten the component. This relates to screw-in tools.

To screw a bladed screw into a target member while drilling a hole, it is necessary to hold the bladed screw on the rotational axis and rotate it, and it is desirable that it can be easily removed from the tool when screwing is finished. .

When the head of a screw with a blade is square, a square hole is provided at the tip of the bit that transmits the rotation, and the head is inserted into the bit, so that the bit can be rotated while being held on the axis of rotation, and when screwing is completed, the tool However, if the head is circular and is rotated by a screwdriver, the rotation must be transmitted by the bit while holding it on the axis of rotation by gripping it with a chuck. It requires a removal operation and the structure for opening and closing is complicated.

This project relates to a screw-in tool suitable for bladed screws with circular heads, in which the chuck automatically expands when screwing is completed, allowing the bladed screw to be removed from the tool, allowing for easy operation. It is.

An embodiment of the present invention will be described below with reference to the drawings.A housing 1 has a size and shape that can be carried by hand and has a built-in electric motor.An auxiliary housing 2 is screwed and protrudes from the tip of the housing 1, and a drive shaft 3 is rotated by the electric motor. is passed through the auxiliary housing 2, and the rectangular shaft-shaped base end 4a of the bit 4 is fitted into the square-shaped mounting hole 5 opened at the tip of the drive shaft 3, and a retainer 6 is inserted.
Fixed by

A restraining cover 7 is screwed and projected from the tip of the auxiliary housing 2, and a front housing 8 surrounding the bit 4 is further arranged in front of it.

The front housing 8 consists of a distal end 8b and a proximal end 8c, both of which are screwed together approximately at the center.

The length of the front housing 8 is variable in the axial direction by adjusting the threaded portion.

A return spring 9 is inserted between the center flange 4b of the bit 4 and the rear end of the base end 8c of the front housing 8, and acts to press the front housing 8 backward against the cover 7. In addition, the front housing 8 has a chuck 11 divided into a plurality of pieces that move back and forth to open and close along the inclined hole 10 at the tip.
is fitted, and the front opening 12 of the inclined hole 10
A circular cylindrical chuck opening member 13 is fitted therein.

The chuck 11 is pushed forward and receives a closing force by a spring 15 inserted between a spring receiver 14 in contact with the rear surface and a protrusion 1t8a in the center of the front housing 8.
The chuck opening member 13 holds the chuck 11 and the spring 15
The flange 13a at the rear end of the opening 12 is pushed forward by the flange 13a.
is stopped against a stopper 16 at the tip of the opening 12.

The bladed screw 20 has a drilling blade 21 at its tip and a circular head 22 at its base end, and the head 22 is provided with a + or - groove 22a for engaging a screwdriver blade. The bit 4 has a blade 17 at its tip that engages with this groove 22a.
is formed.

In this embodiment configured as described above, by pulling the front housing 8 forward against the elasticity of the return spring 9, the bit 4 with the blade 17 protruding toward the front of the chuck 11 is relatively retreated (the second 3), insert the bladed screw 20 through the chuck opening member 13 and insert its head 22 into the chuck 11.
At the same time, the groove 22a is engaged with the blade 17.

At this time, even if it is released into the front housing 8, the bladed screw 2
0 is bitten by the chuck 11 and the return spring 9 is acting in the direction of closing the chuck 11, so the state shown in FIG. 4 is maintained.

Furthermore, when the front nozzle 8 is pulled forward, the head 22
is inserted between the chuck 11 and the blade 17,
In accordance with the length of the head 22, the length of the front housing 8 is adjusted in advance using a threaded portion.

Next, while operating the electric motor and rotating the drive shaft 3 and bit 4, insert the punching blade 21 at the tip of the bladed screw 20 into the target member 2.
Press it at right angles to 3 and screw it in while drilling the hole.

When screwing is near the end, the chuck opening member 13 comes into contact with the surface of the member 23, and when the housing 1 is pressed and screwed further, the chuck opening member 13 retreats and is pushed into the opening 12, which causes the chuck 11 to open. While compressing the spring 15, the chuck opening member 13 is moved backward along the inclined hole 10 and opened to release the head 22.
When the head 22 is completely pushed into the opening 12, the head 22
3 and complete screwing (Figure 5).

At this time, by stopping the electric motor and separating the housing 1 from the member 23, the state shown in FIG. 2 is returned.

Although the auxiliary housing 2 is provided to adjust the relative position of the bit 4 with respect to the front housing 8, it may be omitted, or may be overlapped with the front housing 1 to serve as a guide for movement in the axial direction.

As described above, in this case, a front housing is provided that surrounds the bit engaged with the drive shaft and is movable in the direction of the rotational axis, and a chuck is built in at the tip of the housing and a chuck opening member is protruded. By pulling the housing forward and moving the bit relatively backward, the head of the screw with a blade is fully inserted and engaged with the chuck, and is stably held on the axis of rotation to perform screwing accurately and reliably. This is possible.

Also, when screwing is nearing the end, the cylindrical chuck opening member that holds the chuck and is pushed by the spring and protrudes toward the front housing hits the target member and is moved back, causing the chuck to spread and open. When screwing is almost completed and the bladed screw is no longer firmly screwed into the screw hole it has formed, the chuck opens and the head is automatically released, completing screwing and removing the housing from the component. When the tool is released, the bladed screw immediately separates from the tool.

Therefore, according to the present invention, not only can a screw with a circular head and a blade rotated by a screwdriver be stably held and screwed in, but also the chuck can be chucked with a simple structure without requiring special operations when screwing is completed. 11, which is extremely convenient in practice.

Further, since the front housing is configured to have a variable length in the axial direction, it is possible to hold and screw in even bladed screws having various head lengths.

[Brief explanation of drawings]

FIG. 1 is a partial front view showing an embodiment of the present invention, FIG. 2 is a partial enlarged vertical cross-sectional view, and FIGS. 3, 4, and 5 are partial vertical cross-sectional views showing operating states. 1...Housing, 3...Drive shaft, 4
...Bit, butt...Front housing, 9
... Return spring, 10 ... Slanted hole, 11
...Chuck, 12...Opening, 13.
...Chuck opening member, 15... Spring.

Claims (1)

[Scope of utility model registration request] A front housing 8 that is movable in the direction of the rotational axis is disposed surrounding a bit 4 coupled to a drive shaft 3 that is rotated by an electric motor built in the housing 1, and the front housing 8 is configured to have a variable length in the axial direction, Also, the front housing 8
A chuck 11 that opens and closes by moving along an inclined hole 10 at the tip of the chuck 11.
a cylindrical chuck opening member 13 is fitted into the opening 12 at the tip, and a spring 15 is provided for closing the chuck 11 and protruding the chuck opening member 13 forward of the opening 12. screwing tool.