JPH02279267A - Adjusting device for depth of thread fastening for rotating tool - Google Patents

Abstract

PURPOSE:To prevent the intrusion of a foreign matter into the bonding part and to prevent the damage of a biting part by composing so as to perform the biting bond of a sleeve and lock ring at the inside of a handle. CONSTITUTION:A biting bond parts 15, 25 of a sleeve 10 and lock ring 20 are hidden in a handle 30. The exposure of the biting bond parts 15, 25 to the external part is thus eliminated, the invasion of a foreign matter into this bond parts 15, 25 can be prevented and no finger clogging is caused by this bond parts, 15, 25 by mistake in case of performing the depth adjustment. Also by hiding the lock ring 20 as well in the handle 30 a user does not mix the handle 30 with the lock ring 20 in case of performing the adjustment of the thread fastening depth and can operate the handle 30 easily.

Description

[Detailed description of the invention] [Industrial application field]

The present invention is attached to the tip of a tightening tool such as an electric screwdriver, and by bringing the tip surface into contact with a work surface such as a wall, the distance between the tool and the work surface such as the wall can be adjusted. This invention relates to a screw tightening depth adjusting device that adjusts the tightening depth of a used screw.

[Conventional technology]

Conventionally, as this type of screw tightening depth adjusting device, devices shown in Japanese Utility Model Application No. 63-8697 et al. and Japanese Patent Publication No. 54-34960 have been proposed. As shown in these publications, in general screw tightening depth adjusting devices, a sleeve is attached to the tip of a rotary tool to adjust the distance from the work surface such as a wall where screws are tightened, and the sleeve is rotated. It is screwed to the tip of a rotating tool in a way that surrounds the driver bit that protrudes from the tip of the tool, and by rotating the sleeve, the sleeve is moved back and forth along the axial direction of the driver bit, thereby creating a gap between the tip of the sleeve and the work surface. The distance is adjusted, thereby adjusting the screw tightening depth. To prevent the sleeve from moving back and forth inadvertently after determining the tightening depth, the sleeve is usually coupled to a lock ring that is non-rotatably attached to the tip of the rotary tool, inhibiting its rotational movement. When readjustment is necessary, the sleeve and lock ring are temporarily disconnected and the sleeve is rotated. As seen in the conventional example exemplified above, the connection between the sleeve and the lock ring is held by the spring force of a separately used spring, and when the sleeve is released from the lock ring, the sleeve must be pressed against this spring force. is moved relative to the lock ring to release the connection between the two.

[Problem to be solved by the invention]

In the former conventional example (Japanese Utility Model Application Publication No. 63-86975), the lock ring is placed at the rear of the sleeve, and the rear end surface of the sleeve and the front end surface of the lock ring are connected to each other. The meshing connection between the sleeve and the lock ring is maintained by urging the lock ring forward by a spring housed between the lock ring and the tip of the rotary tool. This meshing part is such that when the sleeve is forcibly rotated, the lock ring temporarily retreats against the spring force of the spring, allowing the sleeve to rotate by a predetermined angle, so-called click rotation. It has a structure. Therefore, in order to adjust the sleeve position yA, it is necessary to forcibly rotate the sleeve while temporarily pushing the lock ring backward against the spring force by applying direct force to the meshing part, or After the lock ring is previously moved backward against the spring force of the spring to completely release the engagement with the sleeve, the sleeve can be freely rotated. However, in this conventional example, the meshing part between the sleeve and the lock ring is exposed to the outside, so when the rotary tool is in use, foreign objects can get into this meshing part and damage the meshing part, or the position of the sleeve may change. There is a risk of accidentally getting your fingers stuck in the gap between the sleeve and the lock ring that inevitably occurs during adjustment. In the latter conventional example (Japanese Patent Publication No. 54-34960), the lock ring is a member integrally fixed to the rotary tool, and a separate handle is provided between the lock ring and the sleeve. This handle is connected to the sleeve so that it cannot rotate relative to it, but can move back and forth.
The engagement protrusion formed on the front end of the lock ring and the engagement groove formed on the rear end of the handle engage with each other, thereby restricting the rotation of the sleeve, that is, the forward and backward movement, and the spring that biases the handle backward. This maintains the engagement between the two. Similar to the former conventional example, even with this combination structure of the sleeve and lock ring,
Since the connecting part between the two is exposed to the outside, there are problems such as damage to the engaging part due to the intrusion of foreign matter or jamming of fingers at the engaging part.Furthermore, in this conventional example, the lock ring does not rotate. Since it is provided on the tool side, the engaging protrusion that locks with the handle must also be provided on the rotary tool side, which causes the problem that the shape of the rotary tool side becomes complicated and molding becomes difficult. The present invention aims to solve the above problems,
The joint between the sleeve and the lock ring is hidden inside the handle, allowing for reliable and safe operation without the risk of foreign matter entering the engagement part or jamming of fingers.Moreover, no complicated molding is required on the rotary tool side. The present invention aims to provide a screw tightening depth adjusting device for a rotary tool that does not require the screw tightening depth of a rotating tool.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a handle that rotates together with the sleeve on the outer periphery of the sleeve that is attached to the tip of the tool in order to adjust the screw tightening depth, and a lock ring is also housed inside the handle. The sleeve and lock ring are meshed and connected inside the sleeve, the lock ring is biased toward the sleeve by a spring, the handle is movable back and forth with respect to the sleeve, and by moving the handle backward, the lock ring is pushed against the spring. A configuration is adopted in which the sleeve can be rotated together with the handle by retracting against force and releasing the engagement connection with the sleeve.

[Effect]

According to the above configuration, since the meshing joint between the sleeve and the lock ring can be hidden inside the handle, the meshing joint is not exposed to the outside, and therefore, it is possible to prevent foreign matter from entering the joint. Also, when adjusting the depth, you will not accidentally jam your fingers at this joint.
Furthermore, since the lock ring can be hidden within the handle, the user can easily operate the handle without confusing the handle with the lock ring when adjusting the screw tightening depth.

【Example】

As shown in FIGS. 1 and 2, the screw tightening depth adjusting device according to the present invention surrounds the driver bit 1 protruding from the rotary tool 40, such as an electric screwdriver, at the tip of the rotary tool 40. A sleeve 10 is detachably attached to the cylindrical protrusion 41 formed at the tip of the rotary tool 40, and a lock ring is attached to the cylindrical protrusion 41 at the rear of the sleeve 10 in a non-rotatable manner. 20, a spring 26 that biases the lock ring 20 forward, and a handle 30 attached to the outer periphery of the sleeve 10. The sleeve 10 is molded from hard synthetic resin, and has a female threaded portion 12 formed on the rear half of its inner peripheral surface, and this female threaded portion 12 is formed on a male threaded portion 42 on the outer periphery of the cylindrical protrusion 41 at the tip of the rotary tool 40. The sleeve 10 is rotatably attached to the cylindrical protrusion 41 by screw coupling, and the sleeve 1
0 rotates, it moves back and forth along the axial direction of the driver bit 1, and adjusts the distance between the working surface such as a wall where the screw is tightened and the tip of the sleeve 10, thereby adjusting the tightening depth of the screw. A metal cap 11 is fixed to the tip of the sleeve 10, which is placed against the working surface to be adjusted, to improve strength. The handle 30 is attached to the outer periphery of the sleeve 10 so as to rotate together with the sleeve 10, and by rotating the handle 30, the sleeve 10 is moved back and forth to adjust the tightening depth described above.
A non-slip strip 131 is formed on the outer periphery. There are three guide protrusions running in the axial direction on the inner peripheral surface of the handle 30.
2 is formed, and this guide protrusion 32 is slidably fitted into the guide arm 14 formed on the outer peripheral surface of the sleeve 10, so that the handle 30 cannot rotate relative to the sleeve 10 but can move freely in the axial direction. becomes. The lock ring 20 is attached to the outer periphery of the cylindrical protrusion 41 at the rear of the sleeve 10 in a non-rotatable but movable manner. It freely fits into a pair of axially extending slide arms 43 formed on the male threaded portion 42,
The lock ring 20 is spring-biased toward the sleeve 10 by a spring 26 housed between a flange 24 provided on the inner peripheral edge of the front end of the lock ring 20 and a pedestal portion 44 behind the cylindrical protrusion 41 of the rotary tool 40. As shown in FIG. 1, the lock ring 20 is contained within the handle 30 over its entire length and is completely hidden within the handle 30. A first meshing step 15 is formed on the f& end surface of the sleeve 10, and a meshing connection is performed with a second meshing step 25 formed on the front end surface of the lock song 20. holds the sleeve 10 non-rotatably relative to the lock ring 20. Therefore, while the sleeve 10 is coupled to the lock ring 20,
Since its rotation is blocked by the lock ring 20, it becomes impossible to move back and forth, and the sleeve 10 is held in a predetermined position. This interlocking joint is completely hidden inside the handle 30 and is not exposed to the outside. The first and second interlocking step portions 15.25 formed on the sleeve 10 and the lock ring 20 each have a shape in which a plurality of protrusions are lined up at regular intervals along the circumferential direction, and the distance between adjacent protrusions in one interlocking step portion is The protrusions of the other interlocking step portion fit into the respective meshing step portions, whereby the two are interlocked and connected. Since each protrusion of each of the above-mentioned engaging step portions 15 and 25 is formed in a trapezoidal shape with tapered sides on both sides, the sleeve 10 is forcibly held together with the handle 30 when the sleeve 10 is engaged and connected to the lock ring 20. When rotated, the lock ring 20 temporarily retreats backwards against the force of the spring 26 due to the interaction between the tapered sides of each protrusion, and then returns to its original position due to the force of this spring. The sleeve 10 is rotated relative to the lock ring 20 by a predetermined angle, so-called click rotation, to adjust the longitudinal position of the sleeve 10. Further, as shown in FIG. 1, the stepped portion of the inner circumferential surface of the handle 30 is located outside the above-mentioned meshing joint portion and the lock ring 20
Therefore, by moving the handle 30 backward, the lock ring 2 is released.
0 can be moved backward against the spring force of the spring 26 to release the above-mentioned interlocking connection. As described above, the handle 30 is movable back and forth relative to the sleeve 10, but rotates together with the sleeve 10. Therefore, the handle 30
By pulling the sleeve 10 toward the rear of the rotary tool 40 side against the spring force and releasing the engagement coupling, the handle 30 is rotated, so that the sleeve 10 can be freely attached to the cylindrical protrusion without being restrained by the lock ring 20. 41, and the front and rear positions of the sleeve 10 can be adjusted steplessly.
Can be adjusted. An example of the rotary tool 40 to which the screw tightening depth adjusting device described above is attached will be briefly described based on the electric screwdriver shown in FIG. is built-in,
The driver bit 1 is attached to the chuck 5 within the cylindrical protrusion 41.
4 to the spindle 53. This spindle 53 is connected to the motor 50 via a clutch 52 and a speed reducer 51, and when the spindle 53 moves backward together with the driver bit by pressing the driver bit 1 against the target screw, the clutch 53 are coupled so that the spindle 53, that is, the driver bit 1, is rotationally driven by the motor 50, and the spindle 53 is urged by a return spring 55 in a direction to disengage the clutch 54. Note that even in the case of a rotary tool that does not have the threaded cylindrical protrusion 41 as described above, the screw tightening depth of the present application can be adjusted by attaching an attachment (not shown) having such a cylindrical protrusion to the rotary tool side. The device can be attached, and the screw tightening depth can be adjusted even with such a rotary tool. If this attachment is made detachable from the rotary tool, the above spring will be held between this attachment and the lock ring 20, and therefore, when screw tightening depth adjustment is not required, the device can be removed together with the attachment. This prevents the spring from popping out.

【Effect of the invention】

As described above, the present invention includes a handle that is not rotatable with the sleeve but is movable back and forth on the outer periphery of the sleeve that is housed at the tip of the tool in order to adjust the screw tightening depth, and inside the handle. Since the sleeve and lock ring are configured to engage and connect, the engagement connection between the sleeve and lock ring is hidden inside the handle and is not exposed to the outside. In addition to preventing foreign matter from entering the mating area and damaging the mating part, there is no chance of accidentally jamming your fingers at this joint when adjusting the depth, which is the case with conventional devices. There are advantages. In addition, since the entire lock ring can be hidden inside the handle, the user can easily adjust the screw tightening depth without confusing the handle with the lock ring when adjusting the screw tightening depth. It has the advantage of being repeatable.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing a screw tightening depth adjusting device for a rotary tool according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the device. 10 is a sleeve, 15 is a first engagement step, 20 is a lock ring, 25 is a second engagement step, 26 is a spring, 30 is a handle, 33 is a release projection, 40 is a rotary tool,
41 is a cylindrical protrusion.

Claims (1)

[Claims] (1) A rotary tool such as an electric screwdriver that is rotatably attached to a cylindrical projection provided at the tip of the tool to surround a rotating bit that protrudes from the tip of the tool, so that the tip surface can be used as a work surface such as a wall. It consists of a sleeve that is used in abutment, a lock ring that is coupled to the sleeve to hold the sleeve in place, and a handle that allows the sleeve to be removed from the lock ring and rotated freely,
The sleeve has a female thread formed on its inner periphery and is rotatably screwed to a male thread provided on the cylindrical protrusion, so that it can move forward and backward in the axial direction of the rotary bit, and as the sleeve rotates. By moving back and forth along the axial direction, the distance between the tip end of the sleeve and a working surface such as a wall is adjusted to adjust the tightening depth by the bit, and the lock ring cannot rotate toward the outer periphery of the cylindrical protrusion. The lock ring is attached so as to be movable in the axial direction; the lock ring is biased by a spring toward the first mesh step formed on the rear end surface of the sleeve, and the second mesh step formed on the lock ring and the first mesh step are urged together by a spring. The sleeve is held in a non-rotatable state with respect to the cylindrical protrusion by engaging with the meshing stepped portion, and the handle is non-rotatable relative to the sleeve on the outer periphery of the sleeve and is movable back and forth, and is attached to the lock ring. The handle is attached so as to be rotatable and movable back and forth, and a release protrusion that engages with the lock ring is formed on the inner periphery of the handle, and when the handle is moved rearward, the release protrusion releases the lock ring from the spring. The sleeve is moved backward against the spring force of the handle to release the meshing connection between the first and second meshing steps, thereby making the sleeve rotatable with respect to the cylindrical protrusion along with the handle, and inside the handle. A screw tightening depth adjusting device for a rotary tool, characterized in that the rear end of the sleeve and the lock ring are housed in the handle, and the above-mentioned meshing joint is hidden in the handle.