Safety device for fixed core drills

Abstract

This prevents the operator from touching the rotating core bit, and also allows the operator to continue checking the drilling status even if dirt is generated during the drilling process. [Solution] A safety device for a fixed core drill 1 comprising a base 2 detachably fixed to a workpiece to be drilled, a guide column 3 erected from the base 2, and a drill unit 4 having a core bit 47 on the base 2 side and installed to be movable along the guide column 3, wherein a first frame member 120 that is fitted onto the core bit 47 is fixed to the base 2, a second frame member 150 that is fitted onto the core bit 47 is fixed to the drill unit 4, and both ends of a coil spring 180 provided between the first frame member 120 and the second frame member 150 and arranged around the core bit 47 are fixed to the first frame member 120 and the second frame member 150.

Description

Technical Field

[0001] The present invention relates to a safety device for a stationary core drill that is used by fixing a base to an object to be drilled, such as a concrete structure.

Background Art

[0002] A stationary core drill that is used by fixing a base to a concrete structure drills holes by rotating a core bit and moving a drill unit with a feed handle. Therefore, it is possible to drill concrete with lower noise and vibration compared to a hammer drill. However, because of the low noise and vibration, it is difficult to recognize the danger of the rotating core bit at a site with high environmental noise. When a wobble occurs due to core deviation in the rotating core bit or when it is about to stop, the operator may accidentally touch it, and an accident of being卷入 is likely to occur. Especially during upward construction, the posture of the operator is not stable, and if the operator's hand is卷入, it can lead to a major accident.

[0003] As a countermeasure against the situation where an operator's hand is卷入 into a rotating core bit, there is a control system that constantly biases the switch part of an energization switch that switches the on state and off state of the power supply to the drill unit to the off state, and makes the switch part that is constantly biased to the off state into the on state against the bias (see Patent Document 1). This control system can immediately stop the rotation of the core bit in case an accident occurs where an operator's finger is卷入 or a situation where it is likely to be卷入.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] It should be noted that the text "卷入" in the original Japanese text seems to be an incorrect or incomplete expression. In the translation, I have left it as it is for the purpose of following the original text precisely. If there is a more accurate or appropriate Japanese term, it would be beneficial to correct and improve the translation.However, the control system described in Patent Document 1 cannot prevent an operator's hand from getting caught in the rotating core bit. To prevent such an incident, it is desirable to have a safety device that can prevent an operator from touching the rotating core bit. Furthermore, this safety device must be one that allows the operator to continue checking the drilling status even if dirt is generated during drilling with a fixed core drill.

[0006] The present invention is proposed in view of the above problems, and aims to provide a safety device for a fixed core drill that can prevent an operator from touching the core bit while the fixed core drill is rotating, and that allows the operator to continue checking the drilling status even if dirt occurs during drilling. [Means for solving the problem]

[0007] The present invention provides a safety device for a fixed core drill, comprising a base detachably fixed to a workpiece, a guide column erected from the base, and a drill unit having a core bit on the base side and movably installed along the guide column, wherein a first frame member fitted onto the core bit is fixed to the base, a second frame member fitted onto the core bit is fixed to the drill unit, and both ends of a coil spring provided between the first and second frame members and positioned around the core bit are fixed to the first and second frame members. According to this invention, by placing a coil spring, which is provided between a first frame member fixed to the base and a second frame member fixed to the movable drill unit, around the core bit, a coil spring is constantly interposed between the rotating core bit and the operator, preventing the operator from touching the rotating core bit of a fixed core drill. Furthermore, if the area around the rotating core bit is covered with a transparent cylindrical cover, the operator will be unable to continuously check the drilling status due to dirt generated during drilling. However, by placing a coil spring around the rotating core bit, the operator can continue to check the drilling status even if dirt is generated during drilling. In particular, in the case of drilling with drilling water, the inside of a transparent cylindrical cover becomes dirty with damp cement powder, making it impossible to see the drilling status by the core bit, which greatly hinders drilling work. However, with this invention, the operator can continue to check the drilling status without any problems even when drilling with drilling water.

[0008] The safety device for a fixed core drill of the present invention is characterized in that the first frame member is connected to a first base portion which is detachably attached to the guide column near the base, and the second frame member is connected to a second base portion which is detachably attached to the guide column so as to follow the movement of the drill unit. According to this, by detachably attaching the first and second bases, which are connected to the first and second frame members that are externally fitted to the core bit, to the guide support column, it can be attached to a fixed core drill using a safety device for fixed core drills as needed, thereby increasing its versatility.

[0009] The safety device for a fixed core drill of the present invention is characterized in that the second frame material is provided in a position that avoids the water supply pipe that supplies water to the drill unit. According to this, when drilling water is injected into the drill unit of a fixed core drill through a water injection pipe and drilling work is performed, it is possible to reliably avoid the second frame material or the safety device for the fixed core drill interfering with the water injection.

[0010] The safety device for a fixed core drill of the present invention is characterized in that both ends of the coil spring are detachably fixed to the first frame material and the second frame material. According to this, for example, when a coil spring deteriorates or when it is necessary to replace it with a coil spring with a different number of turns or elastic force, the coil spring can be easily replaced. [Effects of the Invention]

[0011] According to the safety device for fixed core drills of the present invention, it is possible to prevent an operator from touching the core bit of the fixed core drill while it is rotating, and the operator can continue to check the drilling status even if dirt is generated during drilling. [Brief explanation of the drawing]

[0012] [Figure 1] (a) to (c) are perspective diagrams illustrating a drilling process using a fixed core drill equipped with a safety device for a fixed core drill according to an embodiment of the present invention. [Figure 2] A perspective view of the fixed core drill in the state shown in Figure 1(b), viewed from the opposite side. [Figure 3] A perspective view of a safety device for a fixed core drill according to an embodiment. [Figure 4] (a) is a partial explanatory diagram illustrating the fixing state between the first frame material and the end of the coil spring in the safety device for a fixed core drill according to the embodiment, and (b) is a partial explanatory diagram illustrating the fixing state between the second frame material and the end of the coil spring. [Figure 5] (a) is an enlarged perspective view showing the second base and support rod in the safety device for a fixed core drill according to the embodiment, and (b) is an enlarged perspective view showing the snap lock of the second base in figure (a) in the open position. [Modes for carrying out the invention]

[0013] [Safety device for fixed core drill according to the embodiment] The safety device 100 for a fixed core drill according to the embodiment of the present invention, as shown in Figures 1 to 3, is installed on a fixed core drill 1 that forms a hole in the drilled surface 200 of a concrete structure or the like, which is the object to be drilled, in a state where it can be detachably fixed to the object to be drilled, and prevents an operator from coming into contact with and getting caught in the core bit 47 of the rotating fixed core drill 1. The safety device 100 for a fixed core drill according to this embodiment is detachably attached to the fixed core drill 1.

[0014] The fixed core drill 1 comprises a base 2 that is detachably fixed to a workpiece surface 200 such as a concrete structure, a guide column 3 erected from the base 2, and a drill unit 4 that has a core bit 47 on the base 2 side and is installed to be movable along the guide column 3. The base 2 is a substantially flat plate shape with one side substantially aligned with the workpiece surface 200. In the illustrated example, a substantially rectangular flat plate shape base 2 is installed on the workpiece surface 200 and detachably fixed by fixing bolts or the like.

[0015] The guide column 3 is fixed to the base 2 so as to be erected from the other side of the base 2 that is positioned opposite to the drilled surface 200. In the illustrated example, the guide column 3 is formed in a roughly rectangular prism shape, and a rack 31 extending along the longitudinal direction is formed on the side where the drill body 43 and core bit 47 of the drill unit 4 are positioned.

[0016] The drill unit 4 includes a slide body 41 that is externally fitted onto the guide column 3, and a feed handle 42 provided on the slide body 41. The slide body 41 has a pinion (not shown) installed inside so as to engage with the rack 31, and the slide body 41 moves either towards the base 2 or away from the base 2 by rotating the feed handle 42.

[0017] Furthermore, the drill unit 4 includes a drill body 43 held by a slide body 41, a drill head 44 positioned at the tip of the drill body 43, a water injection pipe connection portion 46 provided on the drill head 44 and to which a water injection pipe 45 for injecting drilling water W into the drill head 44 during drilling is attached, and a core bit 47 attached to the tip side of the drill head 44 and configured to drill a concrete structure or the like from the drilled surface 200 while rotating. When drilling by rotating the core bit 47, a drilling cover 5 is provided around the core bit 47 so as to be placed on the drilled surface 200, and the drilling cover 5 prevents drainage of the drilling water and scattering of the chips.

[0018] The safety device 100 for a stationary core drill includes a first base portion 110 detachably attached to the guide column 3 near the base 2, a first frame member 120 externally inserted into the core bit 47, and a connecting rod 130 connecting the first base portion 110 and the first frame member 120. The first base portion 110 is formed in a frame shape that can be loosely fitted around the outer periphery of the guide column 3. In the illustrated example, one side wall of a square frame is an opening / closing wall 111 attached via a hinge, and the opening / closing wall 111 is configured to open and close (see FIGS. 1 to 3). The closed state of the opening / closing wall 111 is held by locking a snap lock 112, and the opening / closing wall 111 is configured to open by releasing the snap lock 112.

[0019] On the side wall of the first base member 110 on the side of the first frame member 120, a pair of holes corresponding to the connecting rods 130 are drilled. When attaching the safety device 100 for the fixed core drill to the core drill 1, after attaching the first base member 110 to the guide post 3, insert the connecting rod 130 into these holes and tighten with a butterfly screw, so as to fix it so that a pair of connecting rods 130·130 protrude from the first base member 110. In the illustrated example, a pair of linear connecting rods 130 are provided, and the pair of connecting rods 130·130 are provided so as to extend to the first frame member 120. Each end of the pair of connecting rods 130·130 is arranged in contact with the outer surface of the flat plate ring-shaped first frame member 120 (the lower surface of the first frame member 120 in the illustration) and is fixed to the first frame member 120 by welding or the like. That is, in the present embodiment, the first base member 110 is connected to the first frame member 120 via the connecting rod 130. Further, the mutual interval of the pair of connecting rods 130·130 is set to an interval that does not contact the core bit 47 inserted between them.

[0020] The safety device 100 for the fixed core drill has a second base member 140 that is detachably attached to the guide post 3 so as to follow the movement of the drill unit 4, a second frame member 150 that is externally inserted into the core bit 47, and a connecting rod 160 that connects the second base member 140 and the second frame member 150. The second base member 140 is also formed in a frame shape that can be loosely fitted on the outer periphery of the guide post 3. In the illustrated example, one side wall of the square frame is an opening and closing wall 141 attached via a hinge, and the opening and closing wall 141 is configured to open and close (see FIGS. 1 to 3 and FIG. 5). The closed state of the opening and closing wall 141 is held by the locking of the snap lock 142, and the opening and closing wall 141 is opened by opening the snap lock 142.

[0021] A pair of holes corresponding to the connecting rods 160 are drilled in the side wall of the second base 140 on the second frame member 150 side. When attaching the fixed core drill safety device 100 to the core drill 1, the second base 140 is attached to the guide column 3, and then the connecting rods 160 are inserted into these holes and tightened with wing nuts, thereby fixing the pair of connecting rods 160-160 to protrude from the second base 140. In the illustrated example, a pair of Z-shaped connecting rods 160, bent in the drilling direction, are provided, and the pair of connecting rods 160-160 are bent towards the first base 110 side midway and extend to the second frame member 150. The ends of the pair of connecting rods 160-160 are in contact with the outer surface (upper surface of the second frame member 150 in the illustration) of the flat ring-shaped second frame member 150 and are fixed to the second frame member 150 by welding or the like. In other words, in this embodiment, the second base portion 140 is connected to the second frame member 150 via a connecting rod 160. Furthermore, the distance between the pair of connecting rods 160-160 is set so that they do not come into contact with the core bit 47 inserted between them.

[0022] One end of a support rod 170 is fixed to the outer surface of the second base 140 (in the illustrated example, the outer surface of the side wall facing the side wall having the snap lock 142) by bolting or the like, and the support rod 170 is provided so as to extend toward the slide body 41. The other end of the support rod 170 is detachably attached to the slide body 41 by a mounting bolt 171, and the second base 140 and the slide body 41 are fixed to each other via the support rod 170.

[0023] A coil spring 180 having an inner diameter larger than the outer diameter of the core bit 47 is provided between the first frame member 120 and the second frame member 150, and both ends of the coil spring 180 are fixed to the first frame member 120 and the second frame member 150.

[0024] As shown in Figure 4(a), the male threaded portion 192 of the knurled knob 191 is provided on the first frame member 120, penetrating in the direction of movement of the drill unit 4, and the knob portion 193 of the knurled knob 191 is positioned on the inner surface of the first frame member 120 that is on the coil spring 180 side (the upper surface of the first frame member 120 in the figure). A wing nut 194 is provided on the outer surface of the first frame member 120 (the lower surface of the first frame member 120 in the figure) and is screwed onto the male threaded portion 192. One end of the coil spring 180 is positioned along the inner surface of the first frame member 120 (the upper surface of the first frame member 120 in the figure) and is detachably fixed by being sandwiched between the knob portion 193 of the knurled knob 191 and the inner surface of the first frame member 120 (the upper surface of the first frame member 120 in the figure).

[0025] As shown in Figure 4(b), the male threaded portion 192 of the knurled knob 191 is provided on the second frame member 150, penetrating in the direction of movement of the drill unit 4, and the knob portion 193 of the knurled knob 191 is positioned on the inner surface of the second frame member 150 that is on the coil spring 180 side (the lower surface of the second frame member 150 in the figure). A wing nut 194 is provided on the outer surface of the second frame member 150 (the upper surface of the second frame member 150 in the figure) and is screwed onto the male threaded portion 192. The other end of the coil spring 180 is positioned along the inner surface of the second frame member 150 (the lower surface of the second frame member 150 in the figure) and is detachably fixed by being sandwiched between the knob portion 193 of the knurled knob 191 and the inner surface of the second frame member 150 (the lower surface of the second frame member 150 in the figure).

[0026] The second base 140 is fixed to the drill unit 4 by being fixed to the slide body 41 via the support rod 170. The second frame member 150, which is fixed to the second base 140 via the connecting rod 160, is fixed to the drill unit 4 by the second base 140 being fixed to the drill unit 4.

[0027] The first frame member 120 is constantly biased and pressed in the drilling direction by a coil spring 180, and the first base 110, which is fixed to the first frame member 120 via a connecting rod 130, is constantly biased and pressed so as to be in a position that is constantly in contact with the base 2. In other words, the first base 110 is fixed to the base 2, and the first frame member 120, which is fixed to the first base 110, is also fixed to the base 2.

[0028] Furthermore, the Z-shaped connecting rod 160 that connects the second frame member 150 and the second base 140, and the second frame member 150 are positioned to avoid the water inlet pipe connection part 46 of the drill head 44 and the water inlet pipe 45 that injects drilling water W into the drill unit 4 attached to the water inlet pipe connection part 46.

[0029] When drilling into a work surface 200 of a concrete structure or the like with a fixed core drill 1 equipped with a safety device 100 for fixed core drills, a coil spring 180 is constantly interposed between the rotating core bit 47 and the operator, as shown in Figures 1(a) to (c).

[0030] According to the safety device 100 for a fixed core drill of this embodiment, by arranging a coil spring 180, which is provided between a first frame member 120 fixed to the base 2 and a second frame member 150 fixed to the movable drill unit 4, around the core bit, the coil spring 180 is always interposed between the rotating core bit 47 and the operator, thereby preventing the operator from touching the rotating core bit 47 of the fixed core drill 1.

[0031] Furthermore, if the core bit 47 is covered with a transparent cylindrical cover while it is rotating, the operator will be unable to continue checking the drilling status due to dirt generated during the drilling operation. However, by placing a coil spring 180 around the core bit 47 while it is rotating, the operator can continue to check the drilling status even if dirt is generated during the drilling operation. In particular, when drilling with drilling water W injected through a water injection pipe 45, a transparent cylindrical cover would become contaminated with damp cement powder on the inside, making it impossible to see the drilling status by the core bit 47, which would greatly hinder the drilling operation. However, with the safety device 100 for a fixed core drill of this embodiment, the operator can continue to check the drilling status without any problems even when drilling with drilling water.

[0032] Furthermore, by detachably attaching the first base 110 and the second base 140, which are connected to the first frame member 120 and the second frame member 150, respectively, which are externally fitted to the core bit 47, to the guide support column 3, the safety device 100 for fixed core drills can be attached to a fixed core drill as needed, thereby increasing its versatility.

[0033] Furthermore, by positioning the second frame member 150 and the Z-shaped connecting rod 160 to avoid the water supply pipe 45 that supplies water to the drill unit 4, it is possible to reliably avoid the second frame member 150 and the safety device 100 for the fixed core drill obstructing the water supply when drilling water W is supplied to the drill unit 4 of the fixed core drill 1 through the water supply pipe 45 and drilling work is performed.

[0034] Furthermore, by detachably fixing both ends of the coil spring 180 to the first frame member 120 and the second frame member 150, the coil spring 180 can be easily replaced, for example, when the coil spring 180 deteriorates or when it is necessary to replace it with a coil spring with a different number of turns or elastic force.

[0035] [Scope of the invention disclosed herein] The inventions disclosed herein include, in addition to the inventions and embodiments listed herein, the inventions disclosed herein also include, to the extent applicable, those that modify the partial content of these inventions to include other content disclosed herein, or those that add other content disclosed herein to these inventions, or those that delete the partial content to the extent that partial effects are obtained and define them as broader concepts. Furthermore, the inventions disclosed herein also include the following and modifications.

[0036] For example, the shape of the connecting rod 160 that connects the second frame member 150 and the second base 140 can be any shape that avoids the water supply pipe 45 that supplies water to the drill unit 4, such as an L-shape, in addition to the Z-shape described above. Furthermore, the structure for detachably fixing both ends of the coil spring 180 to the first frame member 120 and the second frame member 150 can be any structure other than the knurled knob 191 described above, such as sandwiching the first frame member 120 and the second frame member 150 with a U-shaped leaf spring, within an applicable range. In addition, the structure in the safety device for a fixed core drill of the present invention in which the first frame member is fixed to the base and the second frame member is fixed to the drill unit can be any structure other than the embodiment described above, within an applicable range. For example, it is also possible to fix the second frame member to the drill unit via a connecting rod. [Industrial applicability]

[0037] This invention can be used when employing a fixed core drill, which is used by fixing the base to the object to be drilled, such as a concrete structure. [Explanation of symbols]

[0038] 1…Fixed core drill 2…Base 3…Guide support 31…Rack 4…Drill unit 41…Slide body 42…Feed handle 43…Drill body 44…Drill head 45…Water inlet pipe 46…Water inlet pipe connection 47…Core bit 5…Drilling cover 100…Safety device for fixed core drill 110…First base 111…Opening / closing wall 112…Snap lock 120…First frame material 130…Connecting rod 140…Second base 141…Opening / closing wall 142…Snap lock 150…Second frame material 160…Connecting rod 170…Support rod 171…Mounting bolt 180…Coil spring 191…Knurled knob 192…Male threaded part 193…Knob part 194…Wing nut 200…Drilled surface W…Drilling water

Claims

1. A safety device for a fixed core drill, comprising a base that is detachably fixed to the object to be drilled, a guide column erected from the base, and a drill unit having a core bit on the base side and installed to be movable along the guide column, The first frame material, which is to be extrapolated onto the core bit, is fixed to the base. The second frame material, which is to be fitted onto the core bit, is fixed to the drill unit. A safety device for a fixed core drill, characterized in that both ends of a coil spring, which is provided between the first frame material and the second frame material and positioned around the core bit, are fixed to the first frame material and the second frame material.

2. The first frame member is connected to a first base that is detachably attached to the guide support near the base, The safety device for a fixed core drill according to claim 1, characterized in that the second frame material is connected to a second base which is detachably attached to the guide column so as to follow the movement of the drill unit.

3. The safety device for a fixed core drill according to claim 1 or 2, characterized in that the second frame material is provided in a position that avoids the water supply pipe for supplying water to the drill unit.

4. The safety device for a fixed core drill according to claim 1 or 2, characterized in that both ends of the coil spring are detachably fixed to the first frame material and the second frame material.

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