JPH07328946A - Screw jack for power tool - Google Patents

Abstract

PURPOSE:To provide a screw jack for a power tool capable of fitting or removing the power tool rotating a screw to or from the screw correctly, surely, easily, and safely. CONSTITUTION:This screw jack for a power tool is provided with a tube member 1 fixed to the nonrotation section of a motor-driven screw driver, a slide member 2 fitted to the inside of the tube member 1 slidably by the prescribed size, a divergent screw head section guide face 3c-1 provided on the inside of the tip, a screw head section holding face 3c-3 continued to its back, a chucking member 5 openably/closably fitted to the slide member 2, and a spring 27 exciting the chucking member 5 in the closing direction. A screw head section is smoothly guided by the screw head holding face 3c-3 along the screw head guide face 3c-1 and held by the chucking member 5, and the closed state of the chucking member 5 is locked by the tube member 1 when the slide member 2 is buried into the tube member 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw chuck for a power tool capable of accurately, surely, easily and safely attaching / detaching a power tool for rotating a screw.

[0002]

2. Description of the Related Art Generally, at a construction site or the like, as shown in FIG. 4, an electric screwdriver 41 rotates a screw 42 to cause a drill portion 43 of the screw 42 to bite into a plate 45 and a screw portion 46. Was screwed into the plate 45.

The plate 45 is made of steel, and a nut 51 is screwed into the screw 42 fixed through the plate 45, as shown in FIG. 5, and screwed into the nut 51. A suspension ceiling (not shown) can be attached to the suspension bolt 52.

However, when the rotary shaft 47 of the screw driver 41 is inclined with respect to the screw 42, the tip of the rotary shaft 47 is accurately fitted into the fitting recess 48a formed in the head 48 of the screw 42. I can't, so the screw 42
The direction in which the screw is
There is a problem that the fitting recess 48a of the head 48 of the screw 42 is deformed at the tip of the. Further, when the inclination is large, the tip of the rotary shaft 47 is disengaged from the fitting recess 48a, and the screw driver 41
It is dangerous for workers to use.

[0005]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a screw chuck for a power tool, which allows a power tool for rotating the screw to be attached / detached to / from the screw accurately, reliably, easily and safely. It is in.

[0006]

In order to achieve the above object, a screw chuck for a power tool according to a first aspect of the present invention comprises a cylindrical member fixed to a non-rotating portion of a power tool having a rotating shaft for rotating a screw. A slide member fitted to the inner peripheral side of the tubular member so as to be slidable in the axial direction by a predetermined dimension and having an axial through hole into which the rotary shaft of the power tool is inserted; A slide urging member that urges in a direction projecting from the cylindrical member, a divergent screw head guide surface provided on the inner side of the tip, and a rear of the guide surface, and the shaft center of the screw is the shaft of the rotating shaft. A chucking member that has a screw head gripping surface that supports the screw head so as to match the core, and is attached to the slide member so as to be capable of opening and closing in the radial direction, and the chucking member that is attached in the closing direction. Closing direction biasing part And the chucking member is locked in a closed state by the tubular member when the slide member is retracted into the tubular member by a predetermined dimension against the urging force of the slide urging member. The chucking member is unlocked when the slide member projects from the tubular member according to the urging force of the urging member.

According to a second aspect of the present invention, in the screw chuck for a power tool according to the first aspect, the screw chuck is fixed to the outer peripheral surface of the cylindrical member, and the axial tip end is axially larger than the chucking member tip end. It is characterized by having a stopper that protrudes into.

[0008]

In the screw chuck for a power tool having the above-mentioned structure, the rotary shaft of the power tool is inserted into the axial through holes of the tubular member and the slide member inside the tubular member, and the tubular member is fixed to the non-rotating portion of the power tool. , Attached to power tools.

The operation of screwing the screw into the plate while punching the plate with the screw using the power tool to which the screw chuck is attached is performed as described below.

First, the head of the screw is brought into contact with the divergent screw head guide surface inside the tip of the chucking member, and the head is pushed into the chucking member. Then, the head moves along the diverging screw head guide surface and opens the chucking member in the radial direction against the biasing force of the closing direction biasing member. Then, when the head is pushed into the chucking member by a predetermined size, the head reaches the screw head gripping surface,
The chucking member is biased by the closing direction biasing member to be closed, and the head is gripped by the screw head gripping surface. As a result, the head portion is fitted inside the chucking member, is gripped and fixed by the chucking member, and the axis of the screw is the axis of the rotary shaft inserted in the slide member. Is matched with.

Therefore, the axial center position of the screw is accurately, surely and easily positioned at a predetermined position with respect to the power tool.

Next, the operator supports the power tool so that the screws are perpendicular to the plate, and further pushes the power tool vertically toward the plate. Then, the screw, the chucking member, and the slide member slide rearward in the axial direction with respect to the rotation axis of the cylinder member and the power tool against the urging force of the slide urging member, so that the cylinder member has a predetermined length. Only the size of is immersive. As a result, the chucking member is locked in the closed state in which the head is gripped by the tubular member. At the same time, the tip of the rotary shaft of the power tool slides axially forward with respect to the slide member, and fits into the recess formed on the upper surface of the head of the screw fixed to the chucking member.

As described above, with the shaft center position of the screw firmly positioned at a predetermined position with respect to the power tool, the rotary shaft accurately, reliably and easily in the recess of the head of the screw. Mated. Moreover, in the fitted state of the rotary shaft and the screw, the chucking member is locked in a closed state in which the screw head is gripped. Therefore, it is possible to reliably prevent a fitting error between the rotary shaft and the screw, and it is possible to reliably prevent the screw from coming off the rotary shaft when the screw is rotationally driven. Therefore, the screw tightening work can be performed safely and reliably.

Next, the worker drives the power tool to rotate the rotary shaft, and the rotary shaft rotates the screw. Then, the screw is screwed into the plate while piercing the plate and fixed in a state of penetrating the plate.

Next, the operator pulls the power tool axially rearward. Then, first, the rotary shaft separates from the recess of the screw head and slides axially rearward together with the tubular member of the screw chuck. At the same time, since the slide member projects from the tubular member by a predetermined size, the closing lock of the chucking member is released. Then, the chucking member moves rearward together with the slide member while being pushed open by the head of the screw. Further, when the power tool is pulled axially rearward, the chucking member is separated from the head of the screw and is biased by the closing direction biasing member to be closed.

As described above, according to the present invention, the screw can be accurately and easily positioned at a predetermined position with respect to the power tool only by pushing the screw into the chucking member, and the rotary shaft is screw head. The fitting recess can be fitted accurately and surely.

Further, when the slide member is immersed in the tubular member by a predetermined size and the rotary shaft is fitted into the screw, the chucking member is locked in a closed state by grasping the screw head. It is possible to reliably prevent the screw from coming off the rotating shaft when the screw is driven.

Further, since the screw head has a diverging screw head guide surface inside the tip of the chucking member, the screw head can be easily fitted to the chucking member along the guide surface.

Further, after the screw is screwed into the plate, the closing lock of the chucking member is released only by pulling the electric tool away from the plate. Therefore, the chucking member can be easily removed from the screw after fixing. be able to.

According to the second aspect of the present invention, since a stopper fixed to the outer peripheral surface of the cylindrical member and projecting in the axial direction from the tip of the chucking member is provided, the chucking member is screwed. When the screw is rotated with the rotating shaft of the power tool while holding the head of the tool and the screw is screwed into the plate by a predetermined size, the tip of the stopper contacts the plate and the rotating shaft presses the screw. Disappear. Therefore, due to the presence of the stopper, the operation of the rotary shaft screwing the screw into the plate can be automatically stopped.

The present invention will be described in detail below with reference to the embodiments shown in the drawings.

FIG. 1 shows a cross section of an embodiment of a screw chuck for a power tool of the present invention. In this embodiment, the tubular member 1 and
The cylindrical member 1 is provided with a substantially cylindrical slide member 2 slidably fitted on the inner peripheral surface thereof, and a claw portion 3 attached to the slide member 2 so as to be openable and closable in the radial direction. A cylindrical stopper 28 is fixed to the outer peripheral surface of the tubular member 1. The stopper 28 projects in the axial direction by a predetermined dimension from the tip of the claw portion 3. Figure 1
As shown in (B), the claw portions 3 are arranged at three locations along the outer peripheral surface of the slide member 2 at substantially equal intervals, and the three claw portions 3 form the chucking member 5. ing.

The cylindrical member 1 has a flange portion 6 at one end in the axial direction, and the flange portion 6 is formed with a screw hole 7 penetrating in the axial direction. A non-rotating screw portion 22 of an electric screwdriver 21 as a power tool shown in FIG. 2 is screwed into the screw hole 7. The outer peripheral surface 6a of the flange portion 6 is knurled (not shown) to increase the friction coefficient of the outer peripheral surface 6a so that the flange portion 6 can be easily rotated manually. Therefore, the flange portion 6 can be easily screwed into the non-rotating screw portion 22.
The flange portion 6 has an annular surface 8 provided around the other axial end of the screw hole 7, and a spring receiving ring 10 is arranged on the annular surface 8. A spring 12 as a slide biasing member is arranged between the receiving ring 10 and an annular recess 11 provided on one end surface of the slide member 2 in the axial direction. The slide member 2 has a through hole 13 penetrating in the axial direction. A rotary shaft 23 of the electric screwdriver 21 is rotatably inserted into the through hole 13, and a tip 24 of the rotary shaft 23 has the through hole. It is designed to project from the tip of 13. The rotary shaft 23 can be replaced according to the type of screw to be screwed into the plate.

Further, the slide member 2 has a screw hole 15 provided in the radial direction, and a screw 16 is inserted in the screw hole 15.
Are screwed together. And the head 16a of this screw 16
Is fitted into an opening 17 formed in the cylindrical member 1 and having a predetermined axial dimension, and is guided by the opening 17 and slidable in the axial direction by a predetermined dimension.

The slide member 2 has a substantially rectangular recess 18 that is recessed in the radial direction, and the base 3a and the rear portion 3b of the tab 3 are arranged in the recess 18. The base portion 3a of the claw portion 3 is pivotally attached to the side wall of the recess 18 by a pivot shaft A. This pivot axis A is
As shown in FIG. 1 (A), at the position where the slide member 2 projects to the maximum extent with respect to the tubular member 1, it is located axially outward of the tubular member 1. The pivot axis A is located inside the tubular member 1 when the slide member 2 is retracted from the position shown in FIG. 1 (A) into the tubular member 1.
Further, the rear portion 3b of the claw portion 3 is urged radially outward by a spring 27 arranged in a hole 26 bored radially from the recess 18. This spring 27
Constitute a closing direction urging member. The claw portion 3 has a front portion 3c that extends axially forward from the base portion 3a and projects axially forward from the front end surface 2a of the slide member 2. The front portion 3c is tapered with a tip inclined surface 3c-1 inside the tip. This slope 3
c-1 constitutes a screw head guide surface. The front part 3c
Has a projecting portion T projecting inward in the radial direction. The projecting portion T includes the tip inclined surface 3c-1 and a flat surface 3c-2 continuous from the inclined surface 3c-1 in the axial direction and the flat surface 3c-2. Surface 3c
-2 includes a rear end inclined surface 3c-3 as a screw head gripping surface extending radially outward.

The power tool screw chuck having the above-described structure is mounted on the electric driver 21 shown in FIG.
The operation of screwing the screw into the plate while using the screw chuck will be described below.

First, the rotary shaft 23 of the electric screwdriver 21 is inserted into the cylinder portion 1 and the slide member 2 of the screw chuck, and the screw portion 22 of the electric screwdriver 21 is inserted into the screw hole 7 of the flange portion 6 of the cylinder portion 1. The screw chuck is screwed and attached to the electric screwdriver 21.

Next, the head 32 of the screw 31 shown in FIG.
Is a tip inclined surface 3c-1 on the inner side of the tip of the claw portion 3 which constitutes the screw head guide surface of the chucking member 5 which spreads toward the end.
And the head 32 is pushed into the chucking member 5. Then, as shown in FIG.
Is a tip end inclined surface 3c- which forms a screw head guide surface that widens toward the end.
While being guided by 1, the chucking member 5 is opened in the radial direction. Then, when the head portion 32 is pushed into the chucking member 5 by a predetermined size, the chucking member 5 is biased by the spring 27 to be closed as shown in FIG. As a result, the head 32 of the screw 31 comes into close contact with the rear end inclined surface 3c-3 of the protrusion T of the claw portion 3, and the head 32 has the rear inclined surface 3c-3 and the front end surface 2a of the slide member 2. It is located in a predetermined surrounding space for accommodating the head. In this position,
Fitting recess 33 formed in the head 32 of the screw 31
Is closely opposed to the tip 24 of the rotary shaft 23 of the electric screwdriver inserted in the through hole 13 of the slide member 2. That is, the axial center position of the screw 31 is matched with the axial center of the rotary shaft 23 of the electric driver, and the rotary shaft 23 is reliably positioned at a predetermined position where the screw 31 is accurately fitted. Further, since the head 32 of the screw 31 is guided by the front end inclined surface 3c-1 and automatically guided to the predetermined position, the head 32 can be easily positioned.

Next, the operator supports the electric screwdriver 21 so that the screw 31 is perpendicular to the plate 35, and further pushes the electric screwdriver 21 toward the plate 35 vertically. Then, the electric driver 21 vertically approaches the plate 35 together with the tubular member 1.
At this time, the screw 31, the chucking member 5, and the slide member 2 do not move with respect to the plate 35. Therefore, the screw 31, the chucking member 5, and the slide member 2 slide with respect to the tubular member 1 and the rotary shaft 23 in the direction in which the slide member 2 is retracted into the tubular member 1, and the screw 31
The tip 24 of the rotary shaft 23 fits into the fitting recess 33 formed in the head 32 of the. In this way, with the shaft center position of the screw 31 firmly positioned at a predetermined position with respect to the electric screwdriver 21, the rotary shaft 23 is accurately and surely inserted into the recess 33 of the head 32 of the screw 31. And it is fitted easily. Therefore, the rotational force of the rotary shaft 23 can be efficiently transmitted to the screw 31.

When the chucking member 5 slides together with the slide member 2 with respect to the tubular member 1 in the direction in which the slide member 2 is immersed in the tubular member 1, the claw portion 3 is formed.
The pivot axis A of the base portion 3 a of the base 3 enters the inside of the tubular member 1. Therefore, the front end portion 1a of the tubular member 1 is connected to the pivot axis A of the base portion 3a.
The front part of the claw 3 is surrounded to prevent the claw part 3 from opening. That is, as shown in FIG. 3C, when the tip 24 of the rotary shaft 23 is fitted in the fitting recess 33 of the head portion 32 of the screw 31, the claw portion 3 is locked in the closed state.

Next, the operator operates the electric screwdriver 21.
Is driven to rotate the rotary shaft 23, and the screw 31 is rotated by the rotary shaft 23. Then, as shown in FIG. 4D, the screw 31 is screwed into the plate 35 while piercing the plate 35, and is fixed in a state of penetrating the plate 35.

During rotation of the rotary shaft 23 and rotation of the screw 31, the pivot shaft A of the claw portion 3 is located inside the tubular member 1, so that the claw portion 3 remains closed. It is possible to reliably prevent the screw 31 from being locked and coming off the chucking member 5. Therefore, the electric screwdriver 21
Thus, the work of screwing the screw 31 into the plate 35 can be performed safely, reliably and easily.

When the screw 31 is screwed into the plate 35 by a predetermined size, the tip 28a of the stopper 28 fixed to the tubular member 1 contacts the plate 35, and the rotary shaft 23
Does not press the screw 31. That is, the stopper 2
8, the screwing dimension of the screw 31 into the plate 35 is automatically determined. Further, the stopper 28 covers the chucking member 5 holding the head 32 of the screw 31. That is, since the stopper 28 covers the fitting portion between the rotating shaft 23 and the screw 31 and the rotating screw 31, safety can be improved.

Next, as shown in FIG. 3 (E), the operator pulls the electric driver 21 axially rearward. Then, first, the rotary shaft 23 slides axially rearward together with the tubular member 1, and the tip 24 of the rotary shaft 23 separates from the recess 33 of the head 32 of the screw 31. At the same time, the slide member 2 moves forward with respect to the tubular member 1, and the pivotally attached portion A of the claw portion 3 comes out from the front end portion 1a of the tubular member 1, so that the lock of the claw portion 3 is released. Further, when the electric screwdriver 21 is pulled rearward in the axial direction so as to be separated from the plate 35,
The rear end inclined surface 3c-3 of the claw portion 3 moves rearward along the head portion 32 of the screw 31, and at the same time, the claw portion 3 is pushed open by the head portion 32 of the screw 31. When the electric screwdriver 21 is further pulled axially rearward, as shown in FIG.
It is separated from the head 32 of No. 1 and is biased by the spring 27 to close.

Thus, according to this embodiment, the screw 3
With the shaft core of No. 1 aligned with the shaft core of the rotary shaft 23 of the electric screwdriver 21, the rotary shaft 2 is inserted into the fitting recess 33 of the screw 31.
The tip 24 of 3 can be securely fitted, and
In the fitted state, the screw 31 can be locked. Therefore, it is possible to reliably prevent the fitting error between the screw 31 and the rotary shaft 23 and the removal of the rotary shaft 23 from the fitting recess 33 of the screw 31. Therefore, according to the above embodiment, the screwing operation of the screw 31 into the plate 35 can be performed safely and reliably.

After the screw 31 is screwed into the plate 35, the closing lock of the chucking member 5 is released only by pulling the electric screwdriver 21 away from the plate 35. The king member 5 can be easily removed.

In the above embodiment, the chucking member 5
However, the chucking member may be composed of two wider claw portions which are curved in the circumferential direction. Further, the chucking member may be composed of three or more tab portions.

[0037]

As is apparent from the above, the screw chuck for a power tool of the present invention has a diverging screw head guide surface provided with a chucking member for grasping and fixing the screw head on the inner side of the tip. Since it has a screw head gripping surface connected to the rear of the guide surface, the screw head can be guided to the screw head gripping surface along the screw head guide surface, and the screw is attached to the chucking member. Can be easily installed.

Further, when the tubular member is pressed toward the plate and the tip of the screw is pressed against the plate with the chucking member gripping the head of the screw, the chucking member is sunk into the tubular member together with the slide member. Then, the closed state of the chucking member is locked by the tubular member. At the same time, the screw slides with respect to the tubular member in the retracted direction, and the head of the screw fits into the rotating shaft. As described above, since the closed state of the chucking member can be locked by the tubular member at the same time when the rotary shaft is fitted to the screw head, it is possible to reliably prevent the screw head and the rotary shaft from being disengaged. The screw can be reliably and safely rotated by the rotating shaft.

After the screw is screwed into the plate, the slide member projects from the tubular member by pulling the power tool away from the plate, and the closing lock of the chucking member is automatically released. By continuing to pull the power tool, the chucking member is pushed open by the head of the screw while leaving the head of the screw.
Therefore, the chucking member can be easily removed from the fixed screw.

According to the second aspect of the present invention, since the stopper fixed to the outer peripheral surface of the tubular member and projecting in the axial direction from the tip of the chucking member is provided, the chucking member is screwed. When the screw is rotated with the rotating shaft of the power tool while holding the head of the tool and the screw is screwed into the plate by a predetermined size, the tip of the stopper contacts the plate and the rotating shaft presses the screw. Disappear. Therefore, due to the presence of the stopper, the operation of the rotary shaft screwing the screw into the plate can be automatically stopped. Therefore, it is easy to set the dimensions for screwing the screws into the plate.

[Brief description of drawings]

FIG. 1 (A) is a sectional view of an embodiment of a screw chuck for a power tool of the present invention, and FIG. 1 (B) is a view showing the above embodiment as seen from below in the axial direction.

FIG. 2 is a diagram showing a main part of an electric screwdriver as a power tool.

FIG. 3 (A) is a sectional view showing how a screw is attached to the above embodiment, and FIG. 3 (B) is a sectional view showing how a screw is attached to the chucking member of the above embodiment. Yes,
In FIG. 3 (C), the electric screwdriver is pressed toward the plate to fit the tip of the rotary shaft into the recess of the screw head, and at the same time, the slide member is slid upward with respect to the tubular member to remove the chucking member. FIG. 8 is a cross-sectional view showing a state in which a pivot shaft A is located inside a tubular member 1 and a chucking member is locked in a closed state.

FIG. 4 (D) is a cross-sectional view showing a state in which the stopper is in contact with the plate by screwing the screw into the plate by the rotating shaft of the electric screwdriver and screwing the screw to a predetermined size.
FIG. 4F is a sectional view showing a state where the electric driver is pulled vertically from the plate to separate the rotary shaft from the screw, and at the same time, the closing lock of the chucking member is released and the chucking member is opened. Is pulled more vertically,
FIG. 6 is a cross-sectional view showing a state in which the chucking member is completely separated from the screw and is biased by a spring to close the chucking member.

FIG. 5 (A) is a diagram showing a state in which a screw is attached to the rotating shaft of the electric screwdriver and is arranged vertically to the plate, and FIG. 5 (B) is a diagram in which the screw is screwed into the plate. It is sectional drawing which shows the state with which the suspension bolt was connected to the screw via the nut.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cylindrical member, 2 ... Sliding member, 3 ... Claw part, 3a ... Base part, 3b ... Rear end part, 3c ... Front end part, T ... Projection part, 3c-
DESCRIPTION OF SYMBOLS 1 ... Front-end inclined surface, 3c-2 ... Flat surface, 3c-3 ... Rear-end inclined surface, 5 ... Chucking member, 6 ... Flange part, 7 ... Screw hole, 8 ... Annular surface, 10 ... Spring receiving ring, 12
... Spring, 13 ... Through hole, 17 ... Opening, 21 ... Electric screwdriver, 22 ... Non-rotating screw part, 23 ... Rotating shaft, 24
... tip, 28 ... stopper, 31 ... screw, 32 ... head,
33 ... Fitting recess, 35 ... Plate, A ... Pivot shaft.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuo Ito 2-7-15, Kashiwaoka, Makomanai, Minami-ku, Sapporo-shi, Hokkaido (72) Inventor Kazuya Nakamura 3-1, 81, Higashi-Naeho, East-ku, Sapporo, Hokkaido Koyo Equipment Co., Ltd.

Claims (2)

[Claims] 1. A tubular member fixed to a non-rotating portion of a power tool having a rotating shaft for rotating a screw, and an inner peripheral side of the tubular member fitted so as to be slidable in an axial direction by a predetermined dimension, A slide member having an axial through hole into which the rotary shaft of the power tool is inserted; a slide biasing member for biasing the slide member in a direction projecting from the tubular member; A screw head guide surface, and a screw head gripping surface that is connected to the rear of the guide surface and supports the screw head so that the axis of the screw coincides with the axis of the rotary shaft. A chucking member attached to the slide member so as to be openable and closable in any direction, and a closing direction urging member for urging the chucking member in the closing direction, wherein the slide member urges the slide urging member. Against the tubular member against While the chucking member is locked in the closed state by the tubular member when the sliding member projects from the tubular member according to the urging force of the urging member, the chucking member is locked by the urging force of the urging member. The screw chuck for power tools is characterized by being released. 2. The screw chuck for a power tool according to claim 1, further comprising a stopper fixed to an outer peripheral surface of the cylindrical member and having an axial end projecting in the axial direction more than an axial end of the chucking member. A screw chuck for power tools that is characterized by