Ceiling Work Tool System

Abstract

To provide a ceiling work tool system capable of executing an agile work in a quiet state.SOLUTION: A ceiling work tool system comprises: a first lift frame 120 erected at a part facing a ceiling face CE of a truck 100; a second lift frame 130 usually stored in the first lift frame 120 and lifting so as to orient to the ceiling face CE by a lifting mechanism of the first lift frame 120 during work; a ceiling reaction force receiving plate 30 usually stored in the second lift frame 130 and lifting so as to orient to a work part of the ceiling face by a lifting mechanism of the second lift frame 130 during work; and a wet type drill unit 10. The ceiling reaction force receiving plate 30 includes a gas spring GS1 absorbing a vibration element received from the ceiling face CE during work while securing a work region of the drill unit 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a ceiling work tool system used for drilling anchor holes in ceiling slabs, air intake and exhaust holes for air conditioning equipment, mounting holes for lighting fixtures, and other ceiling processing work. [Background technology]

[0002] Known devices for drilling holes in a portion of a ceiling slab include the automatic ceiling drilling machine disclosed in Patent Document 1 and the drilling device disclosed in Patent Document 2. The automatic ceiling drilling machine disclosed in Patent Document 1 has a lifting section with an extendable mast erected on a carriage, a turntable mounted on the extendable mast so as to rotate, and a cutting tool attached to the turntable, and the desired hole is automatically drilled in the ceiling by the cutting action of the cutting tool and the rotation of the turntable.

[0003] The drilling device disclosed in Patent Document 2 is configured by attaching a drilling machine to a carriage. The drilling machine is capable of moving forward and backward and laterally to the drilling position on the carriage, and is further equipped with a jack arm that fixes the position of the carriage or the drilling machine, and a stroke sensor that regulates the forward and backward movement stroke during cutting. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 6-307076 [Patent Document 2] Patent No. 3076530 Summary of the Invention [Problem to be solved by the invention]

[0005] The automatic ceiling drilling machine in Patent Document 1 drills holes using a cutting tool attached to a rotating turntable, so the cutting accuracy depends on the accuracy of the turntable's rotation, and there are limits to how much accuracy can be improved. Furthermore, it does not take measures to prevent irregular stresses from the ceiling or floor during cutting, or vibrations caused by runout of the turntable and cutting tool, so it cannot suppress noise generation. The same is true for the drilling device in Patent Document 2.

[0006] Furthermore, when constructing ceiling slabs, there is a need to use tools to drill holes near side walls and inside and outside corners, but both the automatic ceiling drilling machine of Patent Document 1 and the drilling device of Patent Document 2 have a large portion of the equipment parallel to the floor surface, making it difficult to drill close to the corners. This is also true for tool systems of this type other than those of Patent Documents 1 and 2, and improvements have been desired.

[0007] In view of the above background, a primary object of the present invention is to provide a ceiling work tool system that is capable of performing ceiling surface processing work without generating noise. Other objects of the present invention will become apparent from the disclosure of this specification. [Means for solving the problem]

[0008] One aspect of the present invention is a ceiling work tool system mounted on a cart, comprising: a first frame erected at a position of the cart facing the ceiling surface; a second frame housed inside the first frame and raised and lowered toward the ceiling surface by the lifting mechanism of the first frame; a ceiling surface stopper housed inside the second frame and raised and lowered toward a working portion of the ceiling surface by the lifting mechanism of the second frame; and a work tool; wherein the ceiling surface stopper is configured to include a vibration-absorbing member that secures a working area for the work tool while absorbing vibration elements received from the ceiling surface when the work tool is operating. [Effects of the Invention]

[0009] According to the present invention, vibrations received during work are absorbed by the vibration-absorbing member, enabling work to be performed in a quiet manner. In addition, because the work tools are housed in the second frame, and the second frame is housed in the first frame, transportation, movement, and work near the side walls of the ceiling surface are facilitated, allowing for work with a small turning radius. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is an external perspective view of a ceiling work tool system according to an embodiment of the present invention; [Figure 2] FIG. 2 is an external perspective view of a lifting mechanism provided in the ceiling work tool system. [Figure 3] FIG. 10 is a front view showing a state in which the lifting mechanism is extended. [Figure 4] FIG. 10 is a partially enlarged front view of the lower structure of the ceiling work tool system when it is moving. [Figure 5] FIG. 10 is a partially enlarged front view of the lower structure of the ceiling work tool system during operation. [Figure 6] FIG. 10 is a partially enlarged front view of the upper structure when the ceiling work tool system is moving. [Figure 7] FIG. 10 is a partially enlarged front view of the upper structure of the ceiling work tool system during operation. [Figure 8] An explanatory diagram of the marking function. [Figure 9] FIG. 4 is a schematic diagram showing a state in which the ceiling work tool system is moving. [Figure 10] FIG. 10 is a schematic diagram showing a state in which the second lifting frame starts to rise. [Figure 11] Schematic diagram showing the state in which the ceiling reaction force receiving portion abuts the ceiling surface. [Figure 12] Schematic diagram showing the state in which the floor reaction force receiving portion abuts the floor surface. [Figure 13] FIG. 10 is a schematic diagram showing a state in which the tip bit of the drill unit is raised toward the work site. [Figure 14] FIG. 10 is a schematic diagram showing a state in which the tip bit of the drill unit has entered the work area. DETAILED DESCRIPTION OF THE INVENTION

[0011] A ceiling work tool system according to one embodiment of the present invention will be described below with reference to the drawings. There are various types of work tools used in ceiling work, but in this example, an example will be described in which the present invention is applied to a work tool system that drills ceiling slabs using a servo motor, which is a type of electric motor, and a wet drill unit.

[0012] For ease of explanation, three-dimensional axes XYZ are set on the drawing, and the +X direction is the forward direction, the -X direction is the backward direction, the X direction is the front-to-back direction, the +Z direction is the vertically upward or upward direction, the -Z direction is the downward direction, the +Y direction is the right direction, the -Y direction is the left direction, the Y direction is the left-to-right direction, looking from the left to the right (or vice versa) is sometimes called a side view, looking from above down is called a top view, looking from the front is called a front view, and looking from the rear is called a rear view.

[0013] [Configuration and Function] Fig. 1 is an external perspective view of an overhead work tool system 1 according to this embodiment. Fig. 2 is an external perspective view of a lifting mechanism provided in the overhead work tool system 1, partially showing the rear side of the lifting mechanism shown in Fig. 1. Fig. 3 is a front view showing the lifting mechanism in an extended state. Fig. 4 is a partially enlarged front view of the lower structure when the ceiling work tool system 1 is moving, and Fig. 5 is a partially enlarged front view of the lower structure when the ceiling work tool system 1 is working. Fig. 6 is a partially enlarged front view of the upper structure when the ceiling work tool system 1 is moving, and Fig. 7 is a partially enlarged front view of the upper structure when the ceiling work tool system 1 is working.

[0014] As shown in these figures, the ceiling work tool system 1 is configured by mounting the main devices or parts, including the work tools used for ceiling work, on a cart 100. The cart 100 includes a frame-shaped bottom frame 101, a planar joint plate 102, a frame-shaped fixture storage frame 104, and casters 105. The casters 105 are fixed to each of the four corners of the bottom frame 101, with wheels 106 rotatably clamped between them. The fixture storage frame 104 is equipped with a battery 200 that supplies power to electrical equipment including the work tools, a water circulation device 300 for supplying and draining cooling water to and from the work tools, and a control panel 400 equipped with an interface for controlling and monitoring the operation of the rotary drive source, the lifting mechanism, etc.

[0015] The joint plate 102 is a metal plate that is fixed to the bottom frame 101 in front of the bottom frame 101 and parallel to the floor surface. The size of the joint plate 102 when viewed from above is slightly larger than the external size of the lifting mechanism and is approximately the same size as the short side of the cart 100. The joint plate 102 has a substantially rectangular opening in the approximate center.

[0016] As shown in Figures 2 and 3, the ceiling work tool system 1 of this embodiment comprises a first lifting frame 120 erected vertically upward from the cart 100, a second lifting frame 130 that is housed in the first lifting frame 120 during transport or movement and is controlled to rise and fall so as to protrude vertically upward by the lifting mechanism of the first lifting frame 120 during work, a drill unit 10 that is housed in the second lifting frame 130 during transport or movement and protrudes toward the work area on the ceiling surface by the lifting mechanism of the second lifting frame 130 during work, a water absorption unit 20, a ceiling reaction force receiving plate 30 that is parallel to the ceiling surface, etc.

[0017] The first lifting frame 120 and the second lifting frame 130 each have a pair of opposing side walls. The opposing side walls are reinforced with reinforcing plates screwed at a predetermined interval. A guide rail 121 protruding linearly in the Z direction is formed on the side wall of the first lifting frame 120 facing the second lifting frame 130, and a guide is formed on the side wall of the second lifting frame 130 for fitting the guide rail 121 of the first lifting frame 120. With the second lifting frame 130 supported by the guide rail 121 and the guide, the lifting mechanism of the first lifting frame 120, for example, a first lifting ball screw 122 with a male thread, is inserted into the end of the second lifting frame 130 with a female thread, and the first lifting ball screw 122 is rotated by a first lifting motor 124. This allows the second lift frame 130 to protrude vertically upward from or be retracted vertically downward from the first lift frame 120. The timing and rotation speed of the rotation drive of the first lift motor 124 are controlled by a control device on the operation panel 400.

[0018] The lower ends of the pair of side walls of the first lifting frame 120 pass through the openings in the joint plate 102 so as to be able to move up and down freely and are joined to the floor reaction force receiving plate 40. However, guide locks are provided on the inside of each side wall immediately below the joint plate 102, which restrict the amount of lifting of the first lifting frame 120 to be below a certain level.

[0019] The floor reaction force receiving plate 40 is a metal plate arranged parallel to the floor surface, and as shown in FIG. 4, it is separated from the floor surface FL during transportation or movement, but as shown in FIG. 5, during operation, it abuts directly or indirectly (when a buffer material is interposed, for example) against the floor surface FL and functions as a floor stopper. At that time, the floor reaction force receiving plate 40 receives stress (reaction force) from the floor surface FL. In addition, gas springs GS2 and GS3 and linear guides LG1 and LG2 that guide the movement of the gas springs GS2 and GS3 in the Z direction are provided between the joint plate 102 and predetermined outer positions of the pair of side walls of the first lifting frame 120.

[0020] The linear guides LG1 and LG2 are components that guide the first lifting frame 120 linearly to prevent its posture from deviating from a line parallel to the Z-axis when it is raised or lowered or during operation. The gas springs GS2 and GS3 are components that use the reaction force of compressed gas as a spring. Compared to metal coils, they have a smaller outer diameter and are lighter, and have a large initial load and a small elastic constant, which gives them the advantage of providing a constant elastic force over a wide range of strokes. In this embodiment, the gas springs GS2 and GS3 are used as vibration-absorbing members that absorb vibrations caused by the reaction force (stress) acting on the floor reaction force receiving plate 40. The reaction force includes a force capable of supporting the weight of the first lifting frame 120 and the second lifting frame 130. Although not shown in FIG. 1, a gas spring (GS2) and a linear guide (LG1) are also provided on the other side wall of the first lifting frame 120, as shown in FIGS.

[0021] A second ball screw 132 with a male thread and its support member are also provided in the space between the side walls of the second lifting frame 130. The second ball screw 132 acts as one of the lifting mechanisms for raising and lowering the drill unit 10, the water suction unit 20, etc. toward the ceiling surface, and is rotationally driven by a second lifting motor 134 provided at the lower end of the second lifting frame 130. The timing and rotational speed of the rotational drive of the second lifting motor 134 are also controlled by the control device of the operation panel 400. The first ball screw 122 and the second ball screw 132 are arranged in positions where they do not overlap when viewed from above.

[0022] A height adjustment table 111 and its support member 112 are detachably attached to the lower bottom of the second lifting frame 130. The height adjustment table 111 is used to adjust the amount of lifting of the second lifting frame 130 afterwards. The support member 112 is threaded with a female screw and also serves as a support member for the first ball screw 122.

[0023] The drill unit 10, which is housed in the second lifting frame 130 during transportation or movement and protrudes from the second lifting frame 130 during operation, is provided with a water suction unit 20 and a ceiling reaction force receiving plate 30 that is parallel to the ceiling surface. In addition, a plurality of guide blocks 133 are formed on the inside of the upper end side wall of the second lifting frame 130 to prevent the drill unit 10 and other components from slipping off when fully extended as shown in Figure 3.

[0024] The drill unit 10 comprises a servo motor 11, which serves as a rotary drive source, a rotational force transmission unit 12, and a tip bit mounting shank 13. A tip bit 14, whose tip is shaped at an angle that allows it to drill holes in metal plates and concrete plates simultaneously, is removably mounted on the tip bit mounting shank 13.

[0025] A work hole 31 that is U-shaped when viewed from above is formed in the approximate center of the ceiling reaction force receiving plate 30. This work hole 31 ensures a work area for the drill unit 10. The portion of the ceiling reaction force receiving plate 30 other than the work hole 31 functions as a protective member that protects the tip bit 14 of the drill unit 10. The water suction unit 20 is connected to a water circulation device 300, and supplies cooling water to the water suction shank of the drill unit 10, and includes a member for absorbing metal chips, concrete slag, etc. generated during work.

[0026] The ceiling reaction force receiving plate 30 is a metal plate placed parallel to the ceiling surface. It is a generally rectangular flat plate measuring 10 cm to 18 cm in length and width, but may have an uneven shape between it and the ceiling surface. When the ceiling work tool system 1 is transported or moved, the ceiling reaction force receiving plate 30 is separated from the ceiling surface CE as shown in FIG. 6, and during operation, it functions as a ceiling surface stopper that abuts against the ceiling surface CE as shown in FIG. 7. At this time, the ceiling reaction force receiving plate 30 receives stress (reaction force) from the ceiling surface CE. Therefore, the ceiling reaction force receiving plate 30 is also provided with a vibration absorbing member similar to the floor surface stopper 40.

[0027] 6 and 7 show an example of a vibration-absorbing member. Specifically, one end of a gas spring GS1 and one end of a pair of linear shafts LS are fixed to the back surface (the surface opposite the ceiling surface) of the ceiling reaction force receiving plate 30. The gas spring GS1 is equivalent to the gas springs GS2 and GS3 described above, and its other end is fixed to the outer wall of the rotational force transmission section 12 of the drill unit 10. The other end of the gas spring GS1 may also be fixed to another location. The other end of the linear shaft LS slidably passes through a linear bushing LB fixed to the tip bit mounting shank 13, forming a free end.

[0028] The linear bushing LB is a type of linear motion mechanism that uses the rolling of steel balls, and is capable of infinite linear motion as long as the length of the linear shaft LS that passes through it is uninterrupted. In other words, the resistance when the linear shaft LS passes through and displaces is extremely small, and vibrations are absorbed and noise generation is suppressed, so it serves to suppress core wobble of the drill unit 10, absorb vibrations, and provide sound insulation.

[0029] 6 and 7, only one pair of linear shaft LS and linear bush LB is shown, but there is another pair behind it. Therefore, the ceiling reaction force receiving plate 30 functions as a ceiling surface stopper that is elastically supported at three points: the pair of linear shafts LS and one gas spring GS1. This ensures that vibrations caused by stress (reaction force) from the ceiling surface can be absorbed. Note that it is also possible to use only one of the gas spring GS1, linear shaft LS, and linear bush LB as a vibration-damping member.

[0030] A first sensor D1 is fixed to a predetermined position on the tip bit mounting shank 13, while a second sensor D2 is fixed to the free end of the linear shaft LS of the pair of linear shafts LS that is closest to the first sensor D1. The first sensor D1 and the second sensor D2 are provided to detect the relative position of the drill unit 10. The sensor output (output of the first sensor D1) is led to a control device built into the operation panel 400 and used to control the lifting speed of the lifting mechanism of the first lifting frame 120 and / or the second lifting frame 130.

[0031] For example, in the control device of the operation panel 400, the lifting mechanism of the first lifting frame 120 and the lifting mechanism of the second lifting frame 130 are raised and lowered at a first speed until the drill unit 10 reaches a predetermined threshold value (for example, the distance from the ceiling surface CE to the tip bit of the drill unit 10 reaches approximately 5 cm) from the initial position, and when the relative position of the drill unit 10 exceeds the threshold value, the lifting mechanism of the first lifting frame 120 and the lifting mechanism of the second lifting frame 130 are raised and lowered at a second speed slower than the first speed. As a result, the drill bit 10 or the like can be raised and lowered (raised) at a relatively high speed until the threshold value is reached, thereby shortening the time until work can be started.

[0032] The ceiling reaction force receiving plate 30 also has a marking function. That is, as shown in the partially enlarged view of Fig. 8, on the surface portion of the ceiling reaction force receiving plate 30 facing the ceiling surface CE, two irradiators LD1 and LD2 that irradiate line lasers in the same angular direction are provided at positions equidistant radially from the center and approximately 90 degrees apart in the circumferential direction. The irradiation timing of each irradiator LD1 and LD2 is controlled by a control device on the operation panel 300.

[0033] The irradiation line of the line laser emitted from each irradiator LD1, LD2 is designed so that the point where it intersects with the other irradiation line becomes the rotation axis of the drill unit 10. Therefore, this intersecting point represents the work site WP, which is the starting point of work by the drill unit 10. The worker can position the work site WP simply by moving the cart 100 so that it is at the desired position, so it is easy to move and operate the cart 100 to the desired work site WP, and work can be done quickly.

[0034] The number of irradiators LD1 and LD2 may be three or more. Also, an irradiator other than a line laser, for example, a two-dimensional beam light or an imaging device may be used to realize a function equivalent to marking.

[0035] [Example of operation] Next, an example of the operation of the ceiling work tool system 1 will be described with reference to Figures 9 to 14, which schematically show the state of the ceiling work tool system 1. In these figures, Ca is a straight line (axis) that is an extension of the rotation axis of the drill unit 10, and indicates the relationship between the arrangement of the ceiling work tool system 1 and the working area WP. That is, the ceiling work tool system 1 of this embodiment is arranged so that the working area on the ceiling surface CE, the rotation axis of the drill unit 10, and the lifting axes of the first lifting frame 120 and the second lifting frame 130 coincide with each other. In a front view, the ceiling reaction force receiving plate 30 is contained within the floor reaction force receiving plate 40, and the floor surface stopper is located almost directly below the ceiling surface stopper. Therefore, the working area WP can be processed with the ceiling work tool system 1 stably fixed.

[0036] 9 shows a state during movement of the ceiling work tool system 1. The second lifting frame 130 and the like (including the drill unit 10, the height adjustment table 111, the support member 112, etc.) are housed in the first lifting frame 120.

[0037] When the drill unit 10 is positioned at the work site WP by the above-mentioned marking function, the second lifting frame 130 and the like are raised linearly in the direction of the ceiling surface CE by the lifting mechanism of the first lifting frame 120, as shown in Fig. 10. At this time, the second lifting frame 130 and the like are raised at the first speed until the relative position of the drill unit 10 detected by the first sensor D1 and the second sensor D2 reaches a threshold value, at which point the rotation speed is reduced to the second speed.

[0038] As shown in Figure 11, when the ceiling reaction force receiving plate 30 abuts against the ceiling surface CE, the ceiling reaction force receiving plate 30 functions as a ceiling surface stopper. At this time, the ceiling reaction force receiving plate 30 is pushed downward by the reaction force, and the gas springs GS1, GS2, and GS3 are compressed. As a result, as shown in Figure 12, the first lifting frame 120 passes through the cart 100 and descends. Then, the floor reaction force receiving plate 40 abuts against the floor surface FL and functions as a floor surface stopper. In other words, the ceiling surface stopper and floor surface stopper are automatically linked together without any operation by the operator.

[0039] As shown in Figure 13, when the ceiling reaction force receiving plate 30 contacts the ceiling surface CE and the floor reaction force receiving plate 40 contacts the floor surface FL, the gas spring GS1 urges the ceiling reaction force receiving plate 30 toward the ceiling surface CE, and the gas springs GS2 and GS3 urge the floor reaction force receiving plate 40 toward the floor surface FL. This stabilizes the working environment of the ceiling work tool system 1. Once this stability is achieved, as shown in Figure 14, the tip bit 14 of the drill bit 10 penetrates the working hole 31 in the ceiling reaction force receiving plate 30 and begins processing the working area on the ceiling surface CE.

[0040] As described above, in this embodiment, the first lifting frame 120 erected on the cart 100 at a position facing the ceiling surface CE, the second lifting frame 130 housed inside the first lifting frame 120 during transport or movement, and the drill bit 10, ceiling reaction force receiving plate 30, etc. housed in the second lifting frame 130 during transport or movement rise in a relay manner toward the ceiling surface CE during work, so the overall height of the ceiling work tool system 1 can be kept low except when work is being done, making transport and movement extremely easy. For example, even when performing ceiling surface processing work in a large office building where the height from floor to ceiling exceeds 4m, the system can easily fit into an elevator or the like that is about 2m high.

[0041] Even during operation, the largest component is the cart 100, followed by the first lifting frame 120. However, because the first lifting frame 120 is attached to the joint plate 102 on the short side of the cart 100, it becomes extremely easy to work, for example, in areas close to the side walls of the ceiling surface CE. Furthermore, the gas spring GS1 absorbs vibrations caused by the reaction force that the ceiling reaction force receiving plate 30 receives from the ceiling surface CE, and the linear shaft LS and linear bushing LB absorb vibrations caused by lateral shaking during operation, so noise generated during operation is significantly reduced compared to when these vibration-absorbing members are not used. In other words, ceiling surface processing work can be performed in a quiet environment.

[0042] In addition, the first lifting frame 120 is erected so that its lower base can be displaced from the cart 100 in the direction of the floor surface FL, and the lower base is vibration-absorbed by a pair of gas springs GS2, GS3 that absorb vibration elements received from outside when the drill unit 10 is operating, thereby enabling ceiling surface processing work to be performed in an even quieter state.

[0043] Furthermore, when the ceiling reaction force receiving plate 30 abuts against the ceiling surface CE and functions as a ceiling surface stopper, the floor reaction force receiving plate 40 functions in conjunction with it as a floor surface stopper, so that the worker can start work quietly in a stable state without vibration without having to perform any special operations.

[0044] In addition, sensors D1 and D2 are provided to detect whether the relative position of the drill unit 10 has reached a threshold distance to the work site, and the control device of the operation panel 300 controls the drill unit 10 etc. to be raised relatively quickly until the relative position of the drill unit 10 reaches the threshold from the initial position, and then raised at a slower speed when the relative position of the drill unit 10 exceeds the threshold, thereby shortening the time until work can begin.

[0045] Furthermore, by providing a ceiling work tool system that further includes a display means for displaying the work starting point of the work area on the ceiling surface CE, the work area on the ceiling surface can be easily grasped, enabling rapid ceiling surface construction work.

[0046] In this embodiment, an example has been described in which the first lifting frame 120 and the second lifting frame 130 are raised and lowered in the vertical direction in a relay manner, but the number of frames that are raised and lowered may be three or more. Furthermore, in the present embodiment, an example of a wet drill unit 10 has been described, but a dry drill unit or a configuration in which another type of rotary tool is mounted as a power tool may also be used.

Claims

1. A ceiling work tool system mounted on a cart, a first frame provided upright at a portion of the carriage facing a ceiling surface; a second frame housed inside the first frame and raised and lowered toward the ceiling surface by a lifting mechanism of the first frame; a ceiling surface stopper and a work tool housed inside the second frame and raised and lowered by a lifting mechanism of the second frame toward a work site on the ceiling surface; the ceiling surface stopper includes a vibration absorbing member that absorbs vibration elements received from the ceiling surface during operation of the power tool while ensuring a working area for the power tool, The first frame has a lower bottom portion that is erected so as to be displaceable from the cart toward the floor, and the lower bottom portion is provided with a floor stopper via a vibration-absorbing member that absorbs vibration elements received from the outside when the power tool is in operation, and the floor stopper and the ceiling stopper are linked together.

2. The vibration absorbing member is a gas spring having one end fixed to the ceiling surface stopper and the other end fixed to a predetermined portion of the power tool. The ceiling work tool system according to claim 1 .

3. 2. The ceiling work tool system according to claim 1, wherein the vibration absorbing member is a linear shaft having one end fixed to the ceiling surface stopper and the other end passing through a linear bushing fixed to a predetermined portion of the work tool.

4. a control unit for controlling the operation of the lifting mechanism of the first frame and / or the lifting mechanism of the second frame; a position sensor that detects whether the relative position of the power tool reaches a predetermined threshold; the control means raises the second frame or the power tool at a first speed until the relative position of the power tool reaches the threshold value from the initial position, and raises the second frame or the power tool at a second speed slower than the first speed when the relative position of the power tool exceeds the threshold value. The ceiling work tool system according to any one of claims 1 to 3.

5. 5. The overhead work tool system according to claim 1, further comprising a display means for displaying a work start point of a work area on the ceiling surface.

Images