JP2002160110A - Drill stand - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drill stand allowing mounting and drilling of even an electric drill having no lock on mechanism on the drill body side, although a mainly direct current power supple type electric drill having no lock on mechanism of a conventional trigger cannot be applied, in a drill stand where the electric drill is mounted downwardly, a lever is tilted vertically to move the electric drill vertically, and forming work of a hole with a relatively large diameter can be easily performed. SOLUTION: This drill stand has a lock on mechanism R in which an opening lever 20 is tilted upwardly to move the electric drill 1 downwardly, a push pin 52 relatively moves in the pressing direction of a trigger 6, and the trigger 6 is held at the ON position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill stand for supporting an electric drill so as to be able to approach and separate toward a work material.

[0002]

2. Description of the Related Art When performing an operation of drilling a hole having a relatively large diameter in a workpiece using an electric drill, a drill stand usually called a borer attachment may be used to easily drill a hole. The drill stand includes a support provided vertically to the workpiece, a drill clamp moving along the support, and an operation lever for moving the drill clamp by tilting up and down. The electric drill is clamped in a downward position on the clamp, and the operating lever is normally tilted upward to move the electric drill downward toward the workpiece with the switch turned on, thereby drilling the workpiece. Is performed. This drill stand is mainly used to reduce the labor of the operator when drilling a hole having a relatively large diameter using an electric drill which is usually held by the operator and used. Generally, an AC drill (an electric drill operated by an AC power supply, the same applies hereinafter) having a large output (drilling ability) is used for a large-diameter drilling operation. Therefore, conventionally, this drill stand has been provided as a dedicated one for an AC drill.

[0003]

However, in the case where an AC power supply cannot be prepared or the like, a drill stand of this kind is used when performing a drilling operation using a DC drill (an electric drill operated by a DC power supply, the same applies hereinafter). You may need it. However, the AC drill generally has a function of locking the ON state once the switch is turned ON (lock-on function), whereas the DC drill generally has a function of avoiding wasteful consumption of the battery. Does not have such a function. Therefore, if it is dedicated to the AC drill, there is no need to provide a mechanism for holding the switch in the ON state on the drill stand side, but in the case of the DC drill, a mechanism for locking the switch to the ON state by some means is necessary. Becomes Conventionally, since a drill stand provided with a mechanism for locking a switch in an on state has not been provided, a reality is that a drill stand cannot be used in the case of a DC drill. Therefore,
The present invention provides a drill stand having a lock-on mechanism for locking a switch of an electric drill in an ON state, and thereby provides a drill stand that can be applied to a DC drill that does not have a switch lock-on function. The purpose is to:

[0004]

To this end, the present invention provides a drill stand as set forth in the above claims. According to the drill stand of the first aspect, when the operation lever is tilted upward, for example, the drill clamp moves down along the column, and the electric drill moves in a direction approaching the workpiece. When the electric drill approaches the work material, the electric drill is switched on by the lock-on mechanism that moves relatively to the electric drill, and is held at the on position. Thus, by the lock-on mechanism provided on the drill stand side,
Since the switch of the electric drill is held at the ON position, even an electric drill that does not have a lock-on mechanism for the switch can be mounted on the drill stand to perform drilling. Therefore, a DC machine having no switch lock-on function can be mounted on the drill stand to perform drilling, and furthermore, the DC machine can perform drilling in a place where an AC power supply cannot be prepared.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS.
A description will be given based on FIG. FIG. 1 shows a state in which an electric drill 1 of a DC power supply type is attached to a drill stand 10 of the present embodiment. A battery (DC power supply) is attached to the tip of the handle portion 2 of the electric drill 1. Note that the battery is omitted in the figure. A trigger 6 is provided at the base of the handle 2. While the trigger 6 is pushed upward in the figure and held in the ON position, the built-in switch is turned on, and accordingly, the electric drill 1 is activated and the drill 5 is rotated. Also, the main body 3 of the electric drill 1
A drill chuck 4 is provided at the tip of the drill, and a drill 5 as a tip tool is mounted on the drill chuck 4. The electric drill 1 is supported by a drill stand 10 described below in a state where the drill 5 faces the workpiece W in a downward direction.

[0006] Now, the drill stand 10 of the present embodiment.
Are a base 11, a support 12 provided on the base 11 in a rising shape, a drill clamp 13 movably provided along the support 12, and a lower side for regulating a moving range of the drill clamp 13. Holder 40 and lock-on mechanism R
Is provided. The workpiece W is set in a state of being placed on the upper surface of the base 11. In the drawing, a U-shaped steel is illustrated as the work material W, and the work material W is set on the upper surface of the base 11 in a state of being turned sideways. The column 12 is attached to the end of the base 11 at a right angle. A guide groove 1 having a constant width and a constant depth is provided on the back side (the right side in FIG.
2a is formed over the entire length. The upper and lower holder portions 30 and 40 and the drill clamp 13 can be moved up and down along the column 12 and cannot rotate around the axis of the column 12 through the guide groove 12a.

First, a drill clamp 13 includes a clamp portion 14 for sandwiching and fixing a cylindrical portion 3 a formed at the tip of a case of the main body 3 of the electric drill 1, and a clamp portion 1.
4 has upper and lower support portions 15 and 16 which extend rearward from the rear portion (the right portion in the figure) and are supported by the columns 12. The clamp part 14 is provided with a fixing bolt 14a, and when the fixing bolt 14a is tightened, the electric drill 1 is fixed to the drill clamp 13 and thus the drill stand 10 downward. If the fixing bolt 14a is loosened, the electric drill 1 can be rotated around the axis (machine length axis) of the drill 5, and the position can be adjusted so that the handle portion 2 does not interfere with the column 12 at the time of vertical movement. .

The upper and lower supporting portions 15 and 16 each have a cylindrical shape and are provided at a certain interval from each other in the axial direction of the column 12. The support portions 15 and 16 are attached movably along the column 12 with the column 12 inserted through the inner peripheral side thereof. Both support parts 15, 16
Guide pieces 17, 17 are attached to the inner peripheral side of the support member 12, and the guide pieces 17, 17 are located in the guide grooves 12a of the columns 12. For this reason, both support parts 15,
Reference numeral 16 is attached to the column 12 so that the column 16 cannot rotate around the axis of the column 12 and cannot rattle in the rotational direction. By moving the support portions 15 and 16 up and down along the columns 12, the drill clamp 13 and thus the electric drill 1 can be moved up and down along the columns 12 and 12. At the approximate center of the side of the drill clamp 13, the tip of an operation lever 20 is connected via a support shaft 21 so as to be rotatable up and down. The tip of the operation lever 20 that is tilted with respect to the support shaft 21 is rotatably connected via a guide pin 47 to a lower holder 40 described below. When the operation lever 20 is tilted up and down, the drill clamp 13 is moved.
As a result, the electric drill 1 moves up and down. This will be described later.

Next, the upper holder 30 and the lower holder 40 will be described. The upper holder portion 30 has a function of supporting a lock-on mechanism R described later on the column 12. The lower holder 40 regulates the lower limit of the drill clamp 13 by contacting the upper support 15 of the drill clamp 13 with the upper surface thereof, and also contacts the lower support 15 with the lower surface. Drill clamp 1
It has a function to regulate the upper limit of 3. Both holders 3
0, 40 have basically the same configuration. In the following description, the reference numerals of the constituent members of the upper holder portion 30 are given parentheses to the reference numerals of the corresponding constituent members of the lower holder portion 40,
A description of the same configuration of the lower holder portion 40 will be omitted. The upper holder 30 (40) has a cylindrical support 31 (41) having an inner peripheral hole 31 a through which the support 12 can be inserted without looseness, and the support 31 (41) is immovable with respect to the support 12. Lock part 32 (42) for fixing
have. The lock portion 32 (42) also has a substantially cylindrical shape, and is formed integrally with the support portion 31 (41) in a direction perpendicular to the axis of the support portion 31 (41). The lock portion 32 (42) includes a lock pin 33 (4
3) is provided movably in the axial direction. A compression spring 34 (44) is interposed between the lock pin 33 (43) and the lock portion 32 (42). For this reason,
This lock pin 33 (43) is in the lock direction (left side in the figure).
Has been energized. This spring urging force causes the lock pin 3
When 3 (43) moves in the locking direction, its tip protrudes into the inner peripheral hole 31a of the support portion 31 (41), and the lock hole 12b formed in the bottom surface of the guide groove 12a of the column 12 is formed.
~ 12b. When the lock pin 33 (43) is inserted into the lock hole 12b, the upper holder 30
(40) is immovably locked to the support 12.

The rear end side (right end side in the figure) of the lock pin 33 (43) also protrudes from the lock portion 32 (42), and the protruding portion is connected to the lever 36 via the support shaft 35 (45). (46) is mounted so as to be rotatable up and down. When the lever 36 (46) is tilted downward, the lock pin 3 is formed by leverage caused by the corner of the lever 36 (46) being abutted against the side surface of the lock portion 32 (42).
3 (43) moves in the unlocking direction (rightward in the figure) against the compression spring 34 (44). Lock pin 33 (43)
Moves in the unlocking direction, the leading end of the upper holder 30 is pulled out from the lock hole 12b.
The position (40) can be adjusted along the column 12. The lock holes 12b are formed at many locations along the guide grooves 12a at appropriate intervals. When the lever 36 (46) is returned upward (in the state shown in the figure), the lever action of the lever 36 (46) is eliminated, and the lock pin 33 (43) is released from the compression spring 34.
The upper holder 30 (40) is immovably locked by (44) in the locking direction.

Next, as shown in FIG.
And the support portions 31 and 41 of the lower holder portion 40 on the side opposite to the lock pin 33 (43) (the left side in the figure)
A guide pin 37 (47) is rotatably mounted in a direction orthogonal to the lock pin 33 (43). At the center of the guide pin 37 (47), an arc-shaped concave portion 37a having the same radius of curvature as that of the column 12 is formed over the entire circumference around its axis. The column 12 is in contact with the concave portion 37a, so that the upper holder portion 30 and the lower holder portion 40 move the guide pins 37 (4
7) It moves up and down smoothly using rolling. The above configuration is common to the upper holder section 30 and the lower holder section 40. At the upper end of the guide groove 12a,
A stopper 12c is attached. This stopper 1
By 2c, the upper holder 30, the drill clamp 13, and the lower holder 40 are prevented from falling off from the support column 12.

The upper holder 30 is provided with a lock-on mechanism R described below. This lock-on mechanism R is not provided on the lower holder section 40. The lock-on mechanism R includes a push pin 52 for pushing the trigger 6 to the ON position using the downward movement of the electric drill 1. The push pin 52 is supported by the bracket 50 so as to be movable in the vertical direction (in FIG. 4, a direction perpendicular to the paper surface). The bracket 50 is attached to the upper holder 30 using the guide pins 37. That is, in the upper holder portion 30, both end portions of the guide pin 37 protrude from both side portions of the support portion 31, and the bracket 50 is attached to the outside of the support portion 31 via the both protrusion portions. A base portion 50a is formed integrally with a front portion of the bracket 50 so as to project horizontally.

The base portion 50a has two insertion holes 51, 51 and an arc-shaped regulating hole 51a. The restriction hole 51a is formed along a circumference centered on the center of the clamp portion 14 (the machine axis of the electric drill 1). Insertion holes 51 are provided at both ends of the restriction hole 51a.
51 are formed continuously. A push pin 52 is inserted through one or the other insertion hole 51. Flange 52 formed at the upper end of push pin 52
A compression spring 53 is interposed between a and the base portion 50a. For this reason, the push pin 52 is urged in a direction to protrude upward from the upper surface of the base portion 50a. The urging force of the compression spring 53 is set larger than the urging force for urging the trigger 6 to the off position. A retaining ring 54 is attached to the lower end of the push pin 52. The retaining ring 54 regulates the upper limit of the push pin 52, and prevents the push pin 52 from falling out of the regulating hole 51a. The push pin 52 has a large diameter portion 52c and a small diameter portion 52b having a smaller diameter than the large diameter portion 52c. Small diameter part 5
2b is formed in a range slightly larger than the thickness of the base portion 50a along the axial direction. The restriction hole 51
a is formed with a width larger than the small diameter portion 52b and smaller than the large diameter portion 52c. The insertion hole 51 has a diameter that allows the large diameter portion 52c to be inserted. For this reason,
When the push pin 52 is located in the insertion hole 51, the push pin 52 can move up and down along its axial direction.
b is located in the regulating hole 51a, the large-diameter portion 52c
Cannot pass through the restriction hole 51a, so that the vertical movement is restricted.

Here, when the drill stand 10 is in use, the push pin 52 is located in the one insertion hole 51. The restriction hole 51a is used to easily move the push pin 52 to the other insertion hole 51. That is, the push pin 52 needs to be brought into contact with the trigger 6 of the electric drill 1 when using the drill stand 10. On the other hand, the electric drill 1 has its handle portion 2 positioned on the left side of the column 12 (under the column 12 in FIG. 4) or on the right side (above the column 12 in FIG. 4) with respect to the drill stand 10. Thus, it is necessary to attach the handle portion 2 to a position where the handle portion 2 does not interfere with the column 12 when the electric drill 1 moves up and down. For this reason, FIG.
According to the two positions of the trigger 6 in the case where the handle portion 2 is attached to a state where the handle portion 2 is located below the column 12 and in the case where the handle portion 2 is attached to a state where the handle portion 2 is located above the column 12,
There are provided insertion holes 51 at the locations. The position of the push pin 52 is changed from one insertion hole 51 to the other insertion hole 51.
(When the position of the handle portion 2 is changed), the push pin 52 is slightly pushed down against the compression spring 53 to hold the small diameter portion 52b at a position where the small diameter portion 52b can enter the regulating hole 51a. And push pin 5
2 may be moved along the restriction hole 51a. Small diameter part 5
In a state in which the push pin 2b is located in the regulation hole 51a, the axial movement of the push pin 52 is regulated (substantially immovable state), so that the downward movement of the electric drill 1 is restricted, and thereby the handle part 2 and the Interference of the columns 12 is avoided.

Next, the operating lever 20 is provided between the drill clamp 13 and the lower holder 40 as described above.
1 and a guide pin 47 so as to be bridged. The operation lever 20 has a U-shape, and both ends of the operation lever 20 are rotatably supported by both ends of the support shaft 21 and the guide pin 47, respectively. The guide pin 47 attached to the lower holder portion 40 is provided with a long slot 20a formed in the operation lever 20,
20a. These long slots 20a, 20a
Is formed long along a line passing between the support shaft 21 and the guide pin 47. The support shaft 21 is allowed to move only in the vertical direction (the direction parallel to the support 12). For this reason, when the support shaft 21 is located at the same height (side-by-side) with respect to the guide pin 47, the distance between the support shaft 21 and the guide pin 47 is minimized, and the support shaft 21 is higher than the side-by-side position. The axial distance between the support shaft 21 and the guide pin 47 increases as the position of the support shaft 21 and the guide pin 47 increases. This change in the distance between the axes is absorbed by the slots 20a. In the case of this embodiment,
If the operation lever 20 is tilted downward (pressed down), the electric drill 1 can be moved upward. When the operation of pushing down the operation lever 20 is stopped, the operation lever 20 is tilted upward by its own weight of the electric drill 1 or the like, and accordingly, the electric drill 1 moves downward. Accordingly, in the case of the present embodiment, if the operator applies a force in the direction of tilting (pushing up) the operation lever 20, the tilting operation force and the total weight of the electric drill 1, the drill clamp 13, and the like are reduced. A corresponding force is applied as a pressing force of the drill 5 against the workpiece W. In addition, an auxiliary lever 23 is attached to the rotation tip side of the operation lever 20.
The electric drill 1 can be moved up and down with a small force by gripping and pushing up and down the auxiliary lever 23.

The drill stand 10 configured as described above
Is used as follows. First, as shown in FIG. 1, the operation lever 20 is tilted downward to hold the drill clamp 13 at the upper end position. In this holding state, the cylindrical portion 3a is clamped to the clamp portion 14 of the drill clamp 13 and the electric drill 1 is held. Is installed facing down. In this mounted state, as shown in FIG. 1, the push pin 52 is in a state of protruding upward from the base portion 50a by the compression spring 53, and the upper end thereof substantially contacts the trigger 6 of the electric drill 1 or the trigger 6 Is slightly pushed in. At this stage, the upper end of the push pin 52 does not necessarily need to be in contact with the trigger 6, and the trigger 6 does not need to be slightly pressed. In short, the electric drill 1 moves downward and the drill 5
The trigger 6 may be pushed into the push pin 52 and turned on before the tip of the upper part contacts the workpiece W, and the position of the upper holder 30 can be adjusted so as to realize this. In order to adjust the position of the upper holder portion 30, the lock hole 12b into which the lock pin 33 is inserted may be changed as described above. The position of the lower holder 40 is also adjusted according to the position of the upper holder 30.

Next, as shown in FIG.
When the operation lever 20 is tilted upward (counterclockwise direction in the figure) with the guide pin 47 as the center, the support shaft 21 is displaced downward, and as a result, the drill clamp 13 is moved downward, so that the electric drill 1 is moved. Start moving downwards. When the electric drill 1 moves downward, the push pin 52 is displaced in the direction of pushing the trigger 6 relatively to the trigger 6, so that the trigger 6 is gradually pushed to the ON side.
As shown in FIG. 2, the trigger 6 is completely pushed into the ON position, and the electric drill 1 is activated, and thus the drill 5 is turned on.
After the rotation starts, the operation lever 20 is further tilted upward to push down the electric drill 1, and thereafter the push pin 52 is displaced downward against the compression spring 53. FIG.
5 shows a state in which the push pin 52 has almost reached the lower limit. In this state, since the upper support portion 15 of the drill clamp 13 is in contact with the lower holder portion 40, the drill clamp 13 cannot move downward any more, so that the electric drill 1 reaches the lower limit and the drill 5 is processed. Penetrate the material W,
The hole has been completely completed. As described above, according to the lock-on mechanism R, when the operation lever 20 is tilted, the electric drill 1 moves downward toward the workpiece W, and the trigger 6 is locked at the ON position by the push pin 52. After the drilling is completed, the operation lever 20 is tilted downward to move the drill clamp 13 upward and return the electric drill 1 upward. When the electric drill 1 returns upward, the push pin 52 is displaced upward (in a direction protruding upward from the base portion 50a) by the compression spring 53. Push pin 52
When the electric drill 1 further moves upward after reaching the upper end position, the trigger 6 is gradually displaced to the off side, and when the electric drill 1 reaches the upper end position, the trigger 6 reaches the off position. The electric drill 1 stops.

As described above, since the drill stand 10 of the present embodiment is provided with the lock-on mechanism R, when the operating lever 20 is operated to bring the electric drill 1 close to the workpiece W, the drill pin 10 is pushed through the push pin 52. As a result, the trigger 6 is pushed into the ON position, whereby the electric drill 1 is automatically activated. The push pin 52 locks the trigger 6 at the ON position while the electric drill 1 is moved downward to perform the boring process. For this reason, the DC drill without the lock-on mechanism of the normal trigger (DC power supply type electric drill 1)
Can be attached to the drill stand 10 for drilling. Further, even with an AC drill (an AC power type electric drill) provided with a lock-on mechanism for a trigger,
The lock-on mechanism R, which is mounted on the drill stand 10, can perform the drilling while locking the trigger at the ON position, thereby saving the trouble of operating the lock-on mechanism built in the electric drill. Can be.

The embodiment described above can be implemented with various changes. For example, the drill stand 10 in which the electric drill 1 is moved up and down by tilting the operation lever 20 up and down is exemplified. However, the lock-on mechanism R according to the present invention moves the operation lever up and down in parallel, for example. The present invention can be similarly applied to a drill stand that moves the electric drill 1 up and down. Further, if the auxiliary lever 23 of the operation lever 20 is provided on the side of the clamp portion 14 opposite to the illustration, the electric drill 1 is gripped by the auxiliary drill 23 and the operation lever 20 is tilted downward around the guide pin 47. Since it moves downward, it is possible to make holes in a stable state.

Further, the push pin 52 is exemplified by a configuration in which the two insertion holes 51, 51 can be appropriately selected and the position thereof can be changed, but a configuration in which the push pin 52 is fixed to one location may be used. Also,
The two support shafts are supported on the base portion 50a so as to be parallel to each other and movable in the axial direction, a bar is bridged between the support shafts, and the bar is pressed against the trigger 6, thereby changing the position of the member. , The lock-on mechanism R can be operated at a plurality of positions of the electric drill.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of the present invention, and is a side view of a drill stand with an electric drill attached. This figure shows a state in which the electric drill is held at the upper end position by tilting the operation lever downward.

FIG. 2 is a view showing an embodiment of the present invention, and is a side view of a drill stand with an electric drill attached. This figure shows a state where the operation lever is lifted halfway. In this state, the trigger is pushed to the ON position.

FIG. 3 is a view showing an embodiment of the present invention, and is a side view of a drill stand with an electric drill attached. This figure shows a state in which the operation lever is pushed up to the upper end position, and the drilling is completed.

FIG. 4 is a plan view of an upper holder and a drill clamp taken along line (4)-(4) of FIG. 1;

[Explanation of symbols]

 R: Lock-on mechanism 1: Electric drill (DC power supply type) 2: Handle part 3a: Cylindrical part 5: Drill (tip tool) 6: Trigger 10: Drill stand 12: Column 13: Drill clamp 14: Clamp part 15: Upper side Support section 16 Lower support section 20 Operation lever 30 Upper holder section 33 Lock pin 36 Lever 37 Guide pin 40 Lower holder section 43 Lock pin 46 Lever 50a Base section 51 Insertion hole, 51a: regulating hole 52: push pin, 52b: small diameter portion, 52c: large diameter portion

Claims (1)

[Claims] 1. A drill clamp for holding an electric drill toward a workpiece, a support for movably supporting the drill clamp in a direction approaching and separating from the workpiece, and a rotatably supported by the support. An operation lever rotatably connected to the drill clamp at a tip end of the rotation is provided, and the electric drill is moved toward the workpiece by moving the drill clamp along the column by tilting the operation lever up and down. A drill stand for removably supporting a drill stand, wherein a lock-on mechanism for holding a switch of the electric drill in an on position using an operation of the electric drill approaching the work material is provided on the column.