JP7516192B2 - Chuck key - Google Patents

Description

The present invention relates to a chuck key.

Electric drills such as impact wrenches, or rotary tools such as lathes, are provided with a rotor called a chuck. The chuck is a mechanism that clamps and holds a cutting tool such as a drill. Figures 7 and 8 are diagrams for explaining the chuck 102 that is connected to the impact wrench. Figure 9 is a schematic diagram showing the chuck 102 and the impact wrench 50 to which the chuck 102 is connected.

The chuck 102 is provided on an adapter 100 that can be attached and detached to the impact wrench 50. The adapter 100 has a connection part 101 at one end that connects to the impact wrench 50. The convex socket 50A of the impact wrench 50 is inserted into the connection part 101 to connect to the impact wrench 50.

The chuck 102 is provided at the other end of the adapter 100. The chuck 102 has a substantially cylindrical chuck body 103, a set of three jaws 104, and a rotating sleeve 105. The rotating sleeve 105 rotates in the circumferential direction around the central axis of the chuck body 103.

The set of three jaws 104 is attached to the tip of the chuck body 103. The three jaws 104 are arranged in the circumferential direction around the central axis of the chuck body 103. The jaws 104 expand and contract relative to the chuck body 103 as the rotating sleeve 105 rotates relative to the chuck body 103. When the three jaws 104 expand relative to the chuck body 103, the diameters of the three circumferentially arranged jaws 104 become smaller, and when they contract, the diameters become larger.

When attaching a cutting tool to the chuck 102, the cutting tool is placed inside the three jaws 104 with larger diameters, and the rotating sleeve 105 is rotated. This causes the three jaws 104 to extend relative to the chuck body 103, reducing their diameters. This allows the cutting tool to be held by the three jaws 104. When removing the cutting tool from the chuck 102, the rotating sleeve 105 is rotated and contracted relative to the chuck body 103, and the cutting tool is removed from the three jaws 104 with larger diameters.

When the adapter 100 with this chuck 102 is attached to an impact wrench 50 and used, the rotating sleeve 105 may bite into the chuck body 103 due to the impact during use, preventing it from rotating. This may result in the cutting tool being unable to be removed.

Therefore, a bevel gear 106, which is a removable gear, is provided at the end of the cylindrical rotating sleeve 105, and a chuck key connection hole 107 is provided in the chuck body 103. The bevel gear 106 rotates the rotating sleeve 105 by operating a chuck key (not shown) that is inserted into and engaged with the chuck key connection hole 107. Examples of chuck keys include those described in Patent Document 1.

The chuck key described in Patent Document 1 can be attached to a power tool such as an impact wrench, and the chuck key can be rotated using the tool. This chuck key also has a through hole that runs through it in a direction perpendicular to the axis. By attaching a round shaft to this through hole, it can also be used as a manual chuck key.

Design Registration No. 1486109

When the chuck key described in Patent Document 1 is used as a manual type, it needs to be turned with bare hands. In this case, if the rotating sleeve 105 is tightly wedged into the chuck body 103, the chuck key may not turn with bare hands. Therefore, even when used as a manual type, it is desirable to be able to turn the chuck key using a tool such as a wrench. Although the chuck key described in Patent Document 1 can be turned using a wrench at the bit portion that can be attached to a power tool, there is a problem in that the bit portion is separated from the gear portion and is difficult to turn.

Therefore, one of the objects of the present invention is to provide a chuck key that can be turned using a rotary tool.

In view of the above object, the present invention provides a chuck key for use in attaching and detaching a tool bit from a chuck having a detachment gear, comprising:
A columnar member extending in a first direction;
a connection portion provided at one end of the columnar member and to which a rotary tool is connected;
a gear portion provided at the other end of the columnar member and meshing with the detachment gear;
a pair of flat surfaces that are parallel to each other and are provided on an outer circumferential surface of the columnar member between the connection portion and the gear portion, the flat surfaces being parallel to each other and in the first direction;
Equipped with
In the first direction, the end on the other end side of the gear portion is defined as a front end, the end on the one end side is defined as a rear end, and the distance between the front end and the rear end is defined as L.
At least a portion of the pair of flat surfaces exists in a region extending from the rear end to a position of a distance L toward the connection portion.

The present invention makes it possible to realize a chuck key that can be turned using a rotary tool.

FIG. 1 is a plan view of a chuck key according to an embodiment. FIG. 2 is a perspective view of the chuck key. FIG. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a diagram for explaining the positions at which the plane pairs are formed. FIG. 6 is a diagram showing a state in which the chuck key is attached to the chuck. FIG. 7 is a diagram for explaining a chuck to be connected to an impact wrench. FIG. 8 is a diagram for explaining a chuck to be connected to an impact wrench. FIG. 9 is a schematic diagram showing a chuck and an impact wrench to which the chuck is connected.

Figure 1 is a plan view of the chuck key 1 of this embodiment. Figure 2 is a perspective view of the chuck key 1. Figure 3 is a cross-sectional view taken along line III-III in Figure 1. Figure 4 is a cross-sectional view taken along line IV-IV in Figure 1.

The chuck key 1 has a columnar member 10 that extends in one direction (hereinafter referred to as the first direction). The columnar member 10 is composed of a connection portion 2 provided at one end thereof, a gear portion 3 provided at the other end thereof, and a pair of flat surfaces 51, 52, and 53 provided between the connection portion 2 and the gear portion 3.

The connection part 2 is connected to an electric rotating tool, for example, an impact wrench. In this embodiment, the connection part 2 is configured as a bit, but the configuration of the connection part 2 is not particularly limited as long as it is configured to be connected to an electric rotating tool.

The gear portion 3 meshes with the bevel gear 106 (see FIG. 7) of the chuck 102. The gear portion 3 is conical in shape with a diameter that decreases outward in the first direction. The tip of the gear portion 3 is provided with an insertion portion 4 that is inserted into a chuck key connection hole 107 (see FIG. 7) of the chuck 102. When the insertion portion 4 is inserted into the chuck key connection hole 107, the gear portion 3 meshes with the bevel gear 106. The shape of the gear portion 3 is not particularly limited as long as it is a shape that meshes with the bevel gear 106 of the chuck 102 described above.

The flat pairs 51, 52, and 53 are provided on the outer peripheral surface of the columnar member 10 between the connection portion 2 and the gear portion 3. As shown in FIG. 3, the flat pairs 51, 52, and 53 are parallel to the first direction and to each other. The flat pairs 52 and 53 are provided at positions rotated ±60° from the flat pair 51 around the axial center of the columnar member 10. That is, as shown in FIG. 3, the cross-sectional view of the flat pairs 51, 52, and 53 viewed from the first direction is hexagonal. The spacing between the flat pair 51, the flat pair 52, and the flat pair 53 are all the same and are larger than the diameter of the connection portion 2, which is the bit.

In this embodiment, the plane pairs 51, 52, and 53 are provided adjacent to the gear portion 3 in the first direction. However, the plane pairs 51, 52, and 53 only need to be provided close to the gear portion 3, and may be separated from the gear portion 3 as shown in FIG. 5. FIG. 5 is a diagram for explaining the formation positions of the plane pairs 51, 52, and 53.

The end of one end side (connection portion 2 side) of the gear portion 3 in the first direction is the rear end, and the end of the other end side (insertion portion 4 side) is the front end, and the distance between the front end and the rear end is represented by L. In this case, it is sufficient that at least a part of the flat surface pairs 51, 52, 53 exists in the area from the rear end of the gear portion 3 toward the connection portion 2 to a position of the distance L. Note that, when the flat surface pairs 51, 52, 53 are formed away from the gear portion 3, the columnar member 10 between the flat surface pairs 51, 52, 53 and the gear portion 3 may be cylindrical or prismatic.

Returning to Figures 1 to 4, a groove 6 is formed in the pair of flat surfaces 51, 52, and 53 along the circumferential direction centered on the central axis of the columnar member 10. A ring 7 is fitted into this groove 6. The ring 7 may be a C-ring or an O-ring. Furthermore, the ring 7 may be a metal member or an elastic member. Also, as shown in Figure 4, the ring 7 has a diameter that protrudes beyond the pair of flat surfaces 51, 52, and 53 when fitted into the groove 6.

Next, we will explain how to use the chuck key 1 configured as described above. The chuck key 1 is used to loosen the rotating sleeve 105 of the chuck 102 when the rotating sleeve 105 is too tight and cannot be loosened by bare hands, making it impossible to remove the cutting tool from the jaws 104.

Figure 6 is a diagram showing the state in which the chuck key 1 is attached to the chuck 102. Note that the chuck 102 shown in Figure 6 is the same as the chuck 102 described in Figure 7, so a detailed description of it will be omitted.

As described above, the bevel gear 106 is provided on the rotating sleeve 105 of the chuck 102. The bevel gear 106 is arranged to rotate integrally with the rotating sleeve 105. In addition, the chuck body 103 is provided with a plurality of chuck key connection holes 107 along the circumferential direction.

When manually rotating the chuck key 1, the insertion portion 4 of the chuck key 1 is inserted into the chuck key connection hole 107 relative to the chuck 102. Then, the gear portion 3 of the chuck key 1 and the bevel gear 106 mesh with each other. In this state, a rotating tool, such as a wrench, is used to pinch and hold the flat pair 51, the flat pair 52, or the flat pair 53, and rotate the chuck key 1. At this time, the wrench is positioned between the gear portion 3 and the ring 7. Since the gear portion 3 and the ring 7 protrude beyond the flat pair 51, 52, and 53, even if the wrench tries to slide in the first direction, the gear portion 3 or the ring 7 prevents the wrench from sliding. This allows the wrench to stably rotate the chuck key 1.

In addition, if the position where the wrench is turned is far from the gear portion 3, which serves as the fulcrum of rotation, the chuck key 1 becomes difficult to turn, and the rotational force may not be transmitted to the bevel gear 106. In this embodiment, the flat surface pairs 51, 52, and 53 held by the wrench are located near the gear portion 3, so that the chuck key 1 is easier to turn and the rotational force can be reliably transmitted to the bevel gear 106 compared to when the flat surface pairs 51, 52, and 53 are far from the gear portion 3.

Furthermore, the spacing between flat surface pairs 51, 52, and 53 is greater than the diameter of connection portion 2, which is the bit. Therefore, in this embodiment, the chuck key 1 can be held more firmly and is easier to rotate than when the bit portion is held with a wrench.

When rotating the chuck key 1 electrically, an electric rotating tool, such as an impact wrench, is connected to the connection part 2, as in the case of a conventional chuck key. The insertion part 4 is then inserted into the chuck key connection hole 107, and the gear part 3 is meshed with the bevel gear 106 to achieve the state shown in FIG. 6, after which the chuck key 1 is rotated by the impact wrench.

As described above, according to this embodiment, when the chuck key 1 is manually rotated to loosen the overtightened rotating sleeve 105, the chuck key 1 can be rotated in a stable state even if a rotating tool such as a wrench is used. This allows the bevel gear 106 and rotating sleeve 105 of the chuck 102 to be rotated reliably, and the cutting tool can be removed.

REFERENCE SIGNS LIST 1 Chuck key 2 Connection portion 3 Gear portion 4 Insertion portion 51, 52, 53 Flat surface pair 6 Groove 7 Ring 10 Columnar member 50 Impact wrench 100 Adapter 101 Connection portion 102 Chuck 103 Chuck body portion 104 Jaw 105 Rotating sleeve 106 Bevel gear 107 Chuck key connection hole

Claims (4)

A chuck key used to attach and detach a tool bit from a chuck with a detachment gear,
A columnar member extending in a first direction;
a first connection portion provided at one end of the columnar member and connected to an electric rotating tool;
a gear portion provided at the other end of the columnar member and meshing with the detachment gear;
a second connection portion connected to a wrench, the second connection portion being provided on an outer circumferential surface of the columnar member between the first connection portion and the gear portion, the second connection portion including a pair of flat surfaces that are parallel to the first direction and parallel to each other;
Equipped with
In the first direction, the end on the other end side of the gear portion is defined as a front end, the end on the one end side is defined as a rear end, and the distance between the front end and the rear end is defined as L.
At least a portion of the plane pair is present in a region from the rear end toward the first connection portion by a distance L.
Chuck key. a groove formed in the pair of flat surfaces along a circumferential direction centered on a central axis of the columnar member;
a ring fitted in the groove;
Equipped with
The ring protrudes beyond the pair of flat surfaces.
2. The chuck key of claim 1. The first connection portion is formed of a bit,
When viewed from the first direction, the distance between the pair of flat surfaces is greater than the diameter of the bit.
The chuck key according to claim 1 or 2. The rod-shaped member further includes two pairs of flat surfaces provided on the outer peripheral surface of the rod-shaped member at positions rotated by ±60° from the pair of flat surfaces around the axis of the rod-shaped member.
The chuck key according to any one of claims 1 to 3.

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