KR20210069157A - Auxiliary handle used for power tool - Google Patents

Abstract

Disclosed is an auxiliary handle for an electric tool, which is mounted in a direction of covering a housing of the electric tool in a direction for crossing a rotary shaft of the electric tool. The auxiliary handle for the electric tool comprises: a first chuck which includes a first arm unit covering one or more surfaces of the housing, and a first engagement unit protruding from one end of the first arm unit; a second chuck which includes a second engagement unit engaged with the first engagement unit by a hinge, and a second arm unit extended from the second engagement unit and installed to cover one or more surfaces of the housing on the opposite side to the first arm unit with the housing in the center; and a handle which has a grip on one end to be gripped by a user, and which has a shaft formed on the other end to penetrate the first engagement unit and the second engagement unit. On a surface where the shaft comes in contact with the first engagement unit, a screw thread is formed to be engaged by a screw. On the shaft and the second engagement unit, a pressurizing surface is formed to force the second engagement unit toward the first engagement unit. By the rotation of the shaft, when the grip gets closer to the first engagement unit, the second chuck rotates toward the first chuck. Accordingly, the auxiliary handle can be easily attached to/detached from the electric tool with simple manipulation.

Description

Auxiliary handle used for power tool}

The present invention relates to a power tool, and more particularly, to an auxiliary handle for a power tool mounted on the power tool so that a user can use the power tool stably by holding it.

In general, power tools use electricity from a wired or battery as a power source to drive a built-in motor to rotate a selectively combined tool depending on the purpose of work such as a screwdriver or drill to perform multiple tasks such as fastening screws or drilling holes. It is one of the tools that can

A typical power tool such as a screwdriver drill, hammer drill, or impact driver drill is formed in a pistol type including a handle. Accordingly, the user performs the operation by holding the handle with one hand. However, when performing work with a large load or impact, there is a disadvantage in that it is difficult to work firmly when the work is performed by gripping the handle with only one hand.

In order to solve this disadvantage, a power tool having an auxiliary handle capable of gripping the other hand in a horizontal direction at the front of the power tool is disclosed. US Patent Publication No. US2014-0251649 (hereinafter, 'publicly known invention') discloses a power tool having a detachable auxiliary handle. The known invention allows the user to detach the auxiliary handle, thereby increasing the convenience of use.

However, since the known invention can release only one of the two arms of the auxiliary handle from the housing of the power tool by manipulating the auxiliary handle, there is a disadvantage in that the amount of operation of the auxiliary handle is large. In addition, there is a disadvantage that a lot of space is required when the power tool is stored in a state in which the auxiliary handle is mounted.

1. US Publication No. US2014/0251649 (published on September 11, 2014)

The embodiment of the present invention has been devised to solve the above problems, and provides an auxiliary handle for a power tool that is very easy to attach and detach and that takes up little space even when the power tool is accommodated in a state where the auxiliary handle is mounted. want to

An embodiment of the present invention provides an auxiliary handle for a power tool mounted in a direction to surround the housing of the power tool in a direction transverse to the axis of rotation of the power tool in order to solve the above problems, the first surrounding at least one surface of the housing a first chuck including an arm part and a first coupling part protruding from one end of the first arm part; A second coupling part hingedly coupled to the first coupling part, and a second arm part extending from the second coupling part and installed to surround at least one surface of the housing opposite the first arm part with respect to the housing. a second chuck comprising; and a handle having a grip that a user can grip at one end and having a shaft penetrating the first coupling part and the second coupling part at the other end thereof. Including, a screw thread is formed on the abutting surface of the shaft and the first coupling part, and the shaft and the second coupling part have a pressing surface to apply a force to the second coupling part toward the first coupling part. This provides an auxiliary handle for a power tool, characterized in that when the grip approaches the first coupling portion by rotation of the shaft, the second chuck rotates toward the first chuck.

Here, between the first coupling part and the second coupling part, a restoring spring installed to apply a force in a direction away from the first coupling part and the second coupling part; it is preferable to further include.

A spring receiving hole in which the restoration spring can be accommodated is formed on surfaces of the first coupling part and the second coupling part facing each other.

The shaft may include a first shaft coupled to the first chuck and the second chuck; and a second shaft coupled to the first shaft so as to be rotatable between a use position parallel to the first shaft and a storage position bent to the first shaft.

It is effective to further include a fixing means for fixing the second shaft to the first shaft at the use position.

The fixing means may include: a movable slot elongated in the longitudinal direction of the second shaft and at least one of the first shaft; a pin coupled to a location where the movable slot is not formed among the first shaft and the second shaft, and coupled to the movable slot; and a rotation preventing means for preventing the second shaft from rotating about the pin when the second shaft is in the use position.

The rotation preventing means may include: a rotation preventing protrusion protruding from a surface facing the first axis of the two axes; and a rotation prevention groove concavely formed on the surface facing the second shaft of the first shaft so that the rotation prevention protrusion can be inserted.

It is effective to further include a movement preventing means for preventing the rotation preventing protrusion from falling out of the rotation preventing groove.

The movement preventing means, the movement preventing groove formed on the surface of the two shafts; a movement preventing rib which is movably coupled to the second coupling portion and engages the movement preventing groove; and a movement prevention restoration spring for restoring the movement prevention rib to be positioned in the movement prevention groove.

According to the problem solving means of the present invention as described above, various effects including the following items can be expected. However, the present invention is not established only when exhibiting all of the following effects.

As described above, when the auxiliary handle of one embodiment of the present invention rotates the handle, the first chuck and the second chuck simultaneously approach or move away from the housing of the power tool, so that the auxiliary handle can be easily attached to and detached from the power tool with little manipulation. can

In addition, by forming the shaft of the handle to be bent, there is an advantage that the area occupied by the space can be reduced even when the auxiliary handle is stored in the mounted state.

1 is a perspective view of an auxiliary handle for a power tool of an embodiment in a state coupled to the power tool of the present invention;
Figure 2 is a perspective view of the first chuck of Figure 1;
Figure 3 is a perspective view of the second chuck of Figure 1;
Fig. 4 is a cross-sectional view taken along line IV-IV of Fig. 1;
5 is a perspective view of the first axis of FIG. 1 ;
Fig. 6 is a perspective view of the second axis of Fig. 1;
Figure 7 is a perspective view of the movement preventing knob of Figure 1;
Fig. 8 is a partial perspective view of the shaft of Fig. 1 in a position of use;
Fig. 9 is a partial perspective view of the shaft of Fig. 1 in a stowed position;
Figure 10 is a side view of a state in which the auxiliary handle of Figure 1 is released from the power tool;
11 is a side view of a state in which the auxiliary handle of FIG. 1 is coupled;

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

1 is a perspective view of an auxiliary handle for a power tool of an embodiment coupled to a power tool of the present invention, FIG. 2 is a perspective view of the first chuck of FIG. 1, FIG. 3 is a perspective view of the second chuck of FIG. 1, FIG. 4 is 1 is a cross-sectional view taken along line IV-IV of FIG. 1 , FIG. 5 is a perspective view of the first axis of FIG. 1 , FIG. 6 is a perspective view of the second axis of FIG. 1 , FIG. 7 is a perspective view of the movement prevention knob of FIG. 1 , FIG. 8 is used FIG. 9 is a partial perspective view of the shaft of FIG. 1 in the retracted position, and FIG. 9 is a partial perspective view of the shaft of FIG. 1 in the stowed position.

As shown in these figures, the auxiliary handle for a power tool of an embodiment of the present invention is mounted in a direction that transverses the rotation shaft 12 of the power tool 10 and surrounds the housing 11 of the power tool. , a first chuck 100 installed including a first arm part 110 surrounding at least one surface of the housing 11 and a first coupling part 120 protruding from one end of the first arm part; A second coupling part 220 hingedly coupled to the first coupling part 110 , the second coupling part 220 extending from the second coupling part 220 , and the opposite side of the first arm part 110 with respect to the housing 11 . A second chuck 200 including a second arm portion 210 installed to surround at least one surface of the housing, a grip 310 that a user can grip is formed at one end, and the first coupling portion ( 120 and a handle 300 having a shaft 340 penetrating through the second coupling part 210 .

The first chuck 100 is formed in an arc shape, and includes a first arm part 110 surrounding one surface of the housing 11 of the power tool, and a first coupling part 120 formed on the upper end of the first arm part 110 . include A first coupling part shaft hole 122 through which the shaft 340 can pass in a direction transverse to the first coupling part 120 is formed, and a thread 123 is formed on the inner circumferential surface of the first coupling part shaft hole 122 . do. A coupling protrusion 111 protrudes from the opposite end of the first coupling part 120 of the first arm part 110 and is fitted into the groove 13 formed in the housing of the power tool 10 . A first coupling part hinge part 121 is formed at an upper end of the first coupling part 120 facing the second coupling part 220 . In addition, a spring receiving hole 124 in which the restoring spring 400 can be accommodated is formed on a surface of the first coupling part 120 facing the second coupling part 220 . The spring receiving hole 124 is formed to have a larger diameter than the first coupling part shaft hole 122 .

The second chuck 200 includes a second arm part 210 formed in an arc shape symmetrical to the first arm part 110 , and a second coupling part 220 formed at an upper end of the second arm part 210 . A second coupling part hinge part 221 capable of being hingedly coupled to the first coupling part hinge part 121 is formed at an upper end of the second coupling part 220 facing the first coupling part. The second coupling part shaft hole 225 through which the shaft 340 can pass in a direction transverse to the second coupling part 220 and the first coupling part 120 of the second coupling part shaft hole 225 facing each other A spring receiving hole 224 in which the restoration spring 400 can be accommodated is formed on the surface. The spring receiving hole 224 is formed to have a larger diameter than the second coupling part shaft hole 225 .

That is, spring receiving holes 124 and 224 in which the restoring spring 400 can be accommodated are formed on the surfaces of the first coupling part 120 and the second coupling part 220 facing each other. Between the first coupling part 120 and the second coupling part 220 in the spring receiving holes 124 and 224, the first coupling part 120 and the second coupling part 220 are separated in a direction away from each other. A restoring spring 400 is installed to apply a force.

The second coupling part shaft hole 225 is formed to expand in a direction toward the grip 310 , and a pressing surface 222 is formed so as to be pressed toward the first coupling part.

A through hole 226 penetrating through the upper and lower sides of the second coupling part 220 is formed, and the boss 228 to which the movement preventing screw 540 is coupled is protruded from the outer surface of the second coupling part 220 and a movement prevention rib insertion hole 227 into which the movement prevention rib 530 is inserted is formed through the upper side of the boss 228 .

A coupling protrusion 211 protrudes from the opposite end of the second coupling part 220 of the second arm 210 and is fitted into the groove 13 formed in the housing of the power tool 10 .

The handle 300 is formed of a shaft 340 and a grip 310 . The shaft 340 includes a first shaft 320 coupled to the first chuck 100 and the second chuck 200 , a use position parallel to the first shaft 320 ( FIG. 8 ), and , and a second shaft 330 coupled to the first shaft 320 so as to be rotatable between the storage positions (FIG. 9) bent on the first shaft. The grip 310 is coupled to one end of the second shaft 330 .

Screw threads 123 and 321 are formed on the abutting surface of the shaft 340 and the first coupling part 120 to be screwed together. That is, the first shaft 320 is a screw thread 321 is formed on the outer peripheral surface to be engaged with the screw thread 123 formed in the first coupling part shaft hole 122 of the first coupling part 120 .

In addition, pressing surfaces 322 and 222 are formed on the shaft 340 and the second coupling part 220 to apply a force to the second coupling part 220 toward the first coupling part 120 . so that when the grip 310 approaches the first coupling part 120 by the rotation of the shaft 340 , the second chuck 200 rotates toward the first chuck 100 . do. That is, by forming the pressing surface 322 in which the diameter of the first shaft 320 increases to be tapered, it is formed in contact with the coupling surface of the second coupling part 222 .

and fixing means for fixing the second shaft 330 with respect to the first shaft 320 at the use position (FIG. 8). The fixing means includes at least one of the second shaft 330 and the first shaft 320 with a movable slot 332 elongated in the longitudinal direction of the shaft, the first shaft 320 and the first shaft 320 . Among the two shafts 330 , a pin 326 coupled to the movable slot 332 is not formed and coupled to the movable slot 332 , and the second shaft 330 is located at the use position (FIG. 8). When there is a rotation preventing means for preventing the second shaft 330 from rotating about the pin 326 is included.

The rotation preventing means includes a rotation preventing protrusion 331 protruding from a surface facing the first axis 320 of the second shaft 330 and the first so that the rotation preventing protrusion 331 can be inserted. The shaft 320 includes a rotation preventing groove 323 concavely formed on the surface facing the second shaft 330 .

It further includes a movement preventing means for preventing the rotation preventing protrusion 331 from falling out of the rotation preventing groove (323). The movement preventing means is movably coupled to the movement preventing groove 334 formed on the surface of the two shafts 330 and the second coupling part 220 to engage the movement preventing groove 323 . and a restoration spring 550 for restoring the prevention rib 530 and the movement prevention rib 530 to be positioned in the movement prevention groove 334 .

More specifically, a pin insertion hole 324 into which a pin 326 is fitted and coupled is formed at the end of the first shaft 320 coupled to the second shaft 330 , and the pin insertion hole 324 is formed. The upper and lower ends of the formed ends are opened by opening holes 325 so that the ends of the second shaft 330 are not interfered during rotation, and the rotation prevention grooves 323 are concave on the surface in contact with the second shaft 330 . is formed

At the end of the second shaft 330 facing the first shaft 320, a rotation prevention protrusion 331 that can be fitted into the rotation prevention groove 323 is protruded, and the movement slot 332 is long on the shaft. It is formed to be penetrated, so that the pin 326 coupled to the pin insertion hole 324 is fitted and slidably moves. On the other hand, the end of the moving slot 332 toward the first axis 320 is formed with an expansion slot 333 in a direction transverse to the moving slot 332 . The expansion slot 333 is formed so that when the second shaft is rotated to the receiving position (FIG. 9), the pin can be rotated without further interference.

The movement prevention rib 530 is formed to protrude from the movement prevention knob 500 as shown in FIG. 7 . The movement preventing knob 500 includes a cylindrical knob body 510 and a spring support 520 having a through hole formed in the center of the knob body 510 and protruding from the inner circumferential surface of the through hole toward the center. Accordingly, one end of the movement prevention restoration spring 550 is supported by the spring support portion 520 of the movement prevention knob 550 , and the other end is supported by the head portion (including the washer) of the bolt 540 coupled to the boss 228 . As a result, the movement prevention restoration spring 550 always presses the movement prevention knob 550 toward the second chuck 200 so that the movement prevention rib 530 is always located in the movement prevention groove 334, 2 Prevents the shaft 330 from moving in the grip direction. In order to move the second shaft in the grip direction, the movement prevention knob 500 is pulled forward based on FIG. 8 to release the coupling between the movement prevention rib 530 and the movement prevention groove 334, and then the second shaft is moved in the grip direction. After moving to, as shown in Figure 9, by folding in a clockwise direction, it can move to the storage position.

Hereinafter, the operation of the auxiliary handle will be described with reference to FIGS. 10 and 11 . 10 is a side view of a state in which the auxiliary handle of FIG. 1 is released from the power tool, and FIG. 11 is a side view of a state in which the auxiliary handle of FIG. 1 is coupled.

10, when the shaft 340 is retracted in the grip 310 direction (X1), the threads (123, 321) rotate the first arm part 110 in the clockwise direction (T3), As the pressing surface 322 retracts, the restoring spring 400 rotates the second arm 210 in the counterclockwise direction T1 to be released from the housing 11 of the power tool.

11 , when the shaft 340 advances in the opposite direction X2 of the grip 310 , the threads 123 and 321 rotate the first arm 110 in the counterclockwise direction T4 . As the pressing surface 322 of the shaft advances, the second arm 210 is rotated in the clockwise direction T2, so that the first arm 110 and the second arm 210 hold the housing 11 of the power tool. Press to secure it to the power tool.

As described above, when the auxiliary handle of one embodiment of the present invention rotates the handle 300, the first chuck and the second chuck 200 simultaneously approach or move away from the housing 11 of the power tool, so that even with little manipulation. The auxiliary handle can be easily attached to and removed from the power tool.

In addition, by forming the shaft 340 of the handle to be bent, there is an advantage in that the area occupied by the space can be reduced even when the auxiliary handle is stored in the mounted state.

In the above, preferred embodiments of the present invention have been exemplarily described, but the scope of the present invention is not limited only to such specific embodiments, and can be appropriately changed within the scope described in the claims.

10: power tool 12: rotary shaft
11: housing 110: first arm part
120: first coupling part 100: first chuck
220: second coupling portion 210: second arm portion
200: second chuck 310: grip
340: axis 300: knob
123, 321: thread 322, 222: pressure surface
400: restoration spring 124, 224: spring receiving hole
320: first axis 330: second axis
332: move slot 326: pin
331: rotation prevention projection 323: rotation prevention groove
334: movement prevention groove 530: movement prevention rib

Claims (9)

In the auxiliary handle for a power tool mounted in a direction that surrounds the housing of the power tool in a direction transverse to the axis of rotation of the power tool,
a first chuck including a first arm portion surrounding at least one surface of the housing, and a first coupling portion protruding from one end of the first arm portion;
A second coupling part hingedly coupled to the first coupling part, and a second arm part extending from the second coupling part and installed to surround at least one surface of the housing opposite the first arm part with respect to the housing. a second chuck comprising; and
a handle having a grip that a user can grip at one end and having a shaft penetrating the first coupling part and the second coupling part at the other end thereof;
including,
A screw thread is formed on the abutting surface of the shaft and the first coupling part to be screwed,
A pressing surface is formed on the shaft and the second coupling part to apply a force toward the second coupling part toward the first coupling part,
Auxiliary handle for a power tool, characterized in that the second chuck rotates toward the first chuck when the grip approaches the first coupling portion by rotation of the shaft.
The method of claim 1,
a restoring spring installed between the first coupling part and the second coupling part to apply a force in a direction away from the first coupling part and the second coupling part;
Auxiliary handle for power tools, characterized in that it further comprises.
Auxiliary handle for a power tool, characterized in that the first coupling portion and the second coupling portion facing each other is formed with a spring receiving hole in which the restoration spring can be accommodated.
4. The method according to any one of claims 1 to 3,
The shaft may include a first shaft coupled to the first chuck and the second chuck; and
a second shaft coupled to the first shaft so as to be rotatable between a use position parallel to the first shaft and a storage position bent to the first shaft;
Auxiliary handle for power tools comprising a.
5. The method of claim 4,
fixing means for fixing the second shaft to the first shaft at the use position;
Auxiliary handle for power tools, characterized in that it further comprises.
6. The method of claim 5,
The fixing means,
a moving slot formed in at least one of the second axis and the first axis in the longitudinal direction of the axis;
a pin coupled to a location where the movable slot is not formed among the first shaft and the second shaft, and coupled to the movable slot; and
rotation preventing means for preventing the second shaft from rotating about the pin when the second shaft is in the use position;
Auxiliary handle for power tools comprising a.
7. The method of claim 6,
The rotation prevention means,
a rotation preventing protrusion protruding from the surface facing the first axis of the second axis; and
a rotation prevention groove formed concavely on the surface facing the second shaft of the first shaft so that the rotation prevention protrusion can be inserted;
Auxiliary handle for power tools comprising a.
8. The method of claim 7,
a movement preventing means for preventing the rotation preventing protrusion from coming out of the rotation preventing groove;
Auxiliary handle for power tools, characterized in that it further comprises.
9. The method of claim 8,
The movement preventing means,
a movement preventing groove formed on the surface of the two shafts;
a movement preventing rib which is movably coupled to the second coupling part and engages the movement preventing groove; and
a movement prevention restoration spring for restoring the movement prevention rib to be positioned in the movement prevention groove;
Auxiliary handle for power tools comprising a.

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