JP4481452B2 - Portable work machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a portable work machine, and more particularly, to a portable work machine fixed to an installation surface facing a work position by an adsorption force by a vacuum pressure.
[0002]
[Prior art]
Various portable work machines have been developed that are carried to the work site, fixed to a required installation surface facing the work position using the suction force of vacuum pressure, and performing operations such as drilling.
For example, Japanese Patent Application Laid-Open No. 8-336826 discloses a suction fixing device for a drilling device in which a concrete surface processing core drill device is supported on an elevator car floor. In this suction fixing device, the suction packing is protruded from the lower surface of the suction body, and a vacuum pressure is formed in a space between the suction body and the car floor surface sealed by the suction packing. In such a suction fixing device, the core drill device can be reliably suctioned and fixed at a required position even when the floor surface is formed to be somewhat rough due to the elasticity of the suction packing.
[0003]
[Problems to be solved by the invention]
However, in the conventional suction fixing device that fixes by the suction force by the vacuum pressure in this way, an elastic sealing material such as a suction packing is disposed between the suction body and the floor surface. A space defined by the elastic sealing material between the two forms a relatively large air pocket. For this reason, when the adsorption force varies depending on the magnitude of the vacuum pressure, the compression amount of the elastic sealing material varies, and the distance between the adsorbent and the floor surface also varies. It is difficult to accurately control the tool position and posture. On the other hand, if the elastic sealing material is made of a material that is hard to some extent, the fluctuation of the compression amount can be suppressed, but it becomes difficult to follow the unevenness of the floor surface, and the floor surface is only slightly deformed due to floor deflection etc. Thus, the elastic sealing material may be separated from the floor surface, thereby destroying the vacuum pressure state, suddenly losing the adsorptive power, and easily coming off the floor surface.
[0004]
The present invention has been made based on such circumstances, and is fixed to the required installation surface facing the work position by the suction force by the vacuum pressure, so that the tool is in an accurate position and a constant posture even if the vacuum pressure changes to some extent. It is an object of the present invention to provide a portable work machine that can be securely held with a required suction force while holding the machine.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, according to the present invention, a portable working machine comprising a frame portion that supports a work tool and a base portion that is adsorbed to an installation surface facing a work position and supports the frame portion, The base portion includes a support surface formed on the upper surface and supporting the frame portion , an adsorption plate having an opening on the lower surface and connected to a vacuum pressure source, and an elastic seal lip disposed on the peripheral portion. The elastic seal lip seals the space between the suction plate and the installation surface while the lower surface of the suction plate is in contact with the installation surface, and adsorbs the suction plate to the installation surface by the vacuum pressure acting on the groove and fixes it. Further, a fixed shaft extending upward from the support surface, an adjustment hole formed on the bottom wall of the frame portion slidable on the support surface, and movably inserted through the fixed shaft, and the adjustment hole At the end of the protruding fixed shaft By pressing the bottom plate against the supporting surface by urging the presser plate to be worn and the presser plate and the bottom wall in a direction away from each other, the frame portion is fixed, and the urging is released. There is provided a portable work machine that includes a lock device that allows the frame portion to move, and is capable of adjusting the position of the frame portion with respect to the support surface .
[0006]
Furthermore, according to the present invention, the portable working machine includes a frame portion that supports the work tool and a base portion that is attracted to the installation surface facing the work position and supports the frame portion, and the base portion is A base plate is provided for mounting a plurality of suction plates having a groove open to the lower surface and connected to a vacuum pressure source and an elastic seal lip disposed on the periphery, and the lower surface of the suction plate is installed on the lower surface of the suction plate. The suction plate and the installation surface are sealed in contact with each other, and the suction plate is adsorbed and fixed to the installation surface by the vacuum pressure acting on the groove. A portable working machine is provided in which a passage communicating with the vacuum pressure source is formed inside and a support surface supporting the frame portion is formed on the upper surface, and the position of the frame portion is adjustable with respect to the support surface. The
These portable work machines are preferably provided with a safety device that disables the work tool when the pressure in the groove exceeds a specified value.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
1 to 6 show a portable work machine according to a preferred embodiment of the present invention. The portable working machine of the present embodiment is formed as a portable drilling machine 10, and a frame part 14 that supports an electric drill 12 that is a working tool on the front surface part, and a base part that supports the frame part 14 from below. 16 and the base portion 16 is suction-fixed to the installation surface at the required position facing the work position with a vacuum pressure to perform the required drilling operation.
[0008]
As shown in FIGS. 1 to 3, the frame portion 14 is mounted with an electric drill 12 so as to be movable up and down via a sliding plate 18 provided on the front surface portion. A feed handle 20 is arranged for raising and lowering the rotary blade located at the tip of the head toward the required position. The feed handle 20 and the sliding plate 18 are connected by a plurality of gears (not shown) and a rack. Further, a handle 22 that can be used when the drilling machine 10 is moved to a required position is provided on the upper portion of the frame portion 14, and a bottom wall 24 that slides on the base portion 16 is provided on the lower portion. In the bottom wall 24, a long hole 26 is formed as an adjustment hole through which a fixed shaft, which will be described later, is movably inserted, with its long axis extending in the front-rear direction of the drilling machine 10.
[0009]
The base portion 16 of the present embodiment includes a substantially oval metal suction plate 28 arranged along the long axis in the front-rear direction of the drilling machine 10, and slides the frame portion 14 through the bottom wall 24. A flat support surface 30 that is movably supported is formed on the upper surface of the suction plate 28. A fixed shaft 32 inserted into the long hole 26 of the bottom wall 24 extends from the support surface 30 of the suction plate 28, and the long axis of the long hole 26 extends at the tip of the fixed shaft 32 protruding from the long hole 26. A disc-shaped presser plate 34 having a larger diameter than the other is mounted and held on the fixed shaft 32 by a nut 36. In this embodiment, the outer diameter of the fixed shaft 32 is substantially equal to the short axis dimension of the long hole 26, and therefore the frame portion 14 can move in the long axis direction of the long hole 26, that is, in the front-rear direction with respect to the base portion 16. Furthermore, it can also rotate around the fixed shaft 32.
[0010]
As shown in FIGS. 2, 3, and 6, a lock device 38 that fixes the frame portion 14 at a required position on the support surface 30 is disposed on the bottom wall 24. The locking device 38 of the present embodiment accommodates two large-diameter balls 42 and one small-diameter ball 44 in a deep groove 40 formed on the top surface of the bottom wall 24, and a small-diameter in a lateral hole 46 communicating with the deep groove 40. A drive screw 48 for moving the ball 44 in the lateral direction is screwed together. Reference numeral 50 denotes a lock handle for operating the drive screw 48.
[0011]
In the locking device 38 of the present embodiment, the length of the deep groove 40 is approximately equal to the sum of the diameters of the two large diameter balls 42, and the width is approximately equal to the diameter of the large diameter balls 42. Further, the depth is formed to be equal to or slightly larger than the diameter of the large-diameter balls 42, and when the large-diameter balls 42 are completely accommodated in the deep grooves 40, these large-diameter balls 42 are bottoms. It is preferable not to protrude from the top surface of the wall. On the other hand, the lateral hole 46 has a diameter larger than that of the small-diameter ball 44 and smaller than that of the large-diameter ball 42. Therefore, the small-diameter ball 44 is located at the boundary between the lateral hole 46 and the deep groove 40, and between these You can move freely.
[0012]
In FIG. 6A, the lock device 38 urges the presser plate 34 and the bottom wall 24 through the three balls 42 and 44 in a direction separating them from each other. The state which pressed to the support surface 30 of 28 and fixed the flame | frame part 14 is shown. By screwing the drive screw 48 into the lateral hole 46, the small-diameter ball 44 gradually moves from the lateral hole 46 into the deep groove 40, whereby the two large-diameter balls 42 move upward in the deep groove 40, and the holding plate 34 is moved. Press. Since the presser plate 34 is fixed on the fixed shaft 32 by the nut 36, the bottom wall 24 is pressed on the support surface 30, and the frame portion 14 moves on the support surface 30 of the suction plate 28 with its frictional force. Fixed to impossible. On the other hand, when moving the frame portion 14, the drive screw 48 is returned via the lock handle 50. As a result, the bias of the three balls is released, the small-diameter ball 44 gradually moves from the deep groove 40 into the lateral hole 46, and the large-diameter ball 42 descends in the deep groove 40, as shown in FIG. Become. The urging of the large-diameter ball 42 against the holding plate 34, and hence the urging of the bottom wall 24 against the suction plate 28, is released, and the frame portion 14 moves on the support surface 30 and adjusts the position relative to the support surface 30. Can do.
[0013]
As shown in FIG. 4, on the flat lower surface of the suction plate 28, a groove extending in the front-rear direction and the lateral direction, that is, a shallow groove 52 is formed over the entire surface, and an elastic seal lip 54 is disposed on the peripheral portion. Yes. The shallow groove 52 is opened not only at the lower surface of the suction plate 28 but also at the peripheral portion of the suction plate 28 at a position between the elastic seal lip 54 and the lower surface. The elastic seal lip 54 is preferably formed by integrating a rubber elastic material having a hard rubber hardness of Hs = 85 ° or more, preferably about Hs = 90 °, onto the suction plate 28 by, for example, baking.
[0014]
As shown in FIGS. 1, 2 and 6, the fixing portion of the elastic seal lip 54 integrated with the suction plate 28 is formed so as not to protrude from the lower surface of the suction plate 28. When fixed by suction, the mounting surface and the lower surface of the suction plate 28 are formed so as to be surely in contact with each other. In the present embodiment, the protrusion 56 is projected from the side surface portion of the suction plate 28 and integrated with the contact area with the elastic seal lip 54 increased. Further, it is preferable that the elastic seal lip 54 protrudes in a trumpet shape from the peripheral portion of the suction plate 28 beyond the lower surface, and is formed to be, for example, about 10 mm to 30 mm without making it longer than necessary.
[0015]
Further, a communication hole 58 that communicates with the shallow groove 52 is formed in the suction plate 28, and a vertical hole 60 that communicates with the communication hole is formed through the fixed shaft 32. On the other hand, a vacuum pump 64 is attached to the frame portion 14, and a suction conduit 66 extends between the vacuum pump 64 and the distal end portion of the fixed shaft 32. In order to prevent foreign matter from being sucked into the vacuum pump 64, for example, an air filter is disposed in the communication hole 58. Reference numeral 68 denotes a pressure sensor for detecting the vacuum pressure acting on the shallow groove 52.
[0016]
When the vacuum pump 64 is operated, the air in the shallow groove 52 is sucked through the suction pipe 66, the vertical hole 60, and the communication hole 58. An elastic seal lip 54 disposed on the periphery of the suction plate 28 seals between the mounting surface on which the suction plate 28 is placed. Thereby, a vacuum pressure acts on the shallow groove 28, and the suction plate 28 is fixed in a state where the lower surface thereof is in contact with the installation surface. In order to make the space for forming the vacuum pressure, that is, the volume of the air reservoir, as small as possible, the shallow groove 52 is preferably formed as shallow as possible.
[0017]
FIG. 5 shows an electric circuit of the drilling machine 10 of the present embodiment. In this drilling machine 10, a drill motor MT for driving the electric drill 12 and a pump motor MP for driving the vacuum pump 64 are arranged in parallel to the AC power source in which the main switch 70 is arranged. A pressure detector 72 is provided as a safety device for disabling the electric drill 12 when the acting adsorption force is small, that is, when the vacuum pressure acting on the shallow groove 52 does not reach a specified value. Reference numeral 74 denotes an operation switch of the drill motor MT. The pump motor MP may be either a direct current motor or an alternating current motor. When an alternating current motor is used, the AC / DC converter 76 is disposed at a position indicated by an imaginary line instead of a position indicated by a solid line.
[0018]
When drilling work is performed with the punching machine 10, it is performed as follows.
First, the hole punching machine 10 is moved to a work position where the hole 22 is gripped by gripping the handle 22, and the suction plate 28 of the base portion 16 is placed on a suitable installation surface. This installation surface may be somewhat uneven. Further, at this stage, the suction plate 28 may support the elastic seal lip 56 in the peripheral portion without the lower surface contacting the installation surface.
[0019]
Next, the main switch 70 shown in FIG. 5 is closed, and the drive motor MP of the vacuum pump 64 is operated. Air in the shallow groove 52 is sucked through the suction pipe 66, the vertical hole 60, and the communication hole 58 shown in FIG. 1, and the lower surface of the suction plate 28 is in direct contact with the installation surface. When the specified vacuum pressure is reached, the pressure detector 72 detects this state with a signal from the pressure sensor 68, and the drill motor MT can be operated. Thereby, when the operation switch 74 is closed, the electric drill 12 is operated. By rotating the feed handle 20, the blade is moved up and down to make a required hole. If the vacuum pressure drops to a state where the vacuum pressure does not reach the specified value for some reason during the operation, the pressure detector 72 detects this state and disables the drill motor MT.
[0020]
When the electric drill 12 is moved with the suction plate 28 fixed, the lock handle 50 shown in FIG. 2 is loosened to release the urging force of the presser plate 34 via the three balls 42 and 44. Thereby, the frame part 14 can move to the required position on the support surface 30 of the suction plate 28 while moving the fixed shaft 32 in the long hole 26. Therefore, fine adjustment of the drilling position after suction is possible. Is possible. After the electric drill 12 is disposed at a predetermined position, the frame portion 14 is fixed to the suction plate 28 by tightening the lock handle 50 again. It is also possible to provide another safety device that renders the drill motor MT inoperable electrically or mechanically when the pressing force of the presser plate 34 by the lock device 38 is released.
[0021]
After the drilling operation is finished, when removing the drilling machine 10 from the installation surface, the main switch 70 is opened. Then, atmospheric pressure is applied to the shallow groove 52. If necessary, a ventilation valve (not shown) for connecting the suction pipe 66 to the atmosphere may be provided.
[0022]
According to the punching machine 10 of the present embodiment, the suction plate 28 is in direct contact with the installation surface, and the elastic seal lip 54 is not interposed therebetween, so that even if the vacuum pressure acting on the shallow groove 52 changes, the suction plate 28 does not move and holds the position very accurately. Further, the elastic seal lip 54 extending from the peripheral portion of the suction plate 28 can absorb the suction plate 28 even when the installation surface is uneven due to its elasticity, and the installation surface itself is bent. However, it is possible to follow this while deforming along the installation surface, and therefore, the suction plate 28 is not suddenly detached from the installation surface due to the thrust load due to the drilling operation. Further, since the lower surface of the suction plate 28 directly contacts the material of the installation surface, even if an uneven load is applied to the suction plate 28, the suction plate 28 does not tilt with respect to the installation surface, and the horizontal state is maintained. The blade of the electric drill 12 is maintained in a fixed posture. Furthermore, since the elastic seal lip 54 has a short lip length and is formed of a relatively hard material, the suction plate 28 is not displaced due to excessive elasticity, and accurate positioning accuracy is maintained. For this reason, the installation surface may be a steel material or a concrete surface at a construction site in addition to a work table having a flat work surface, and can be applied not only to a flat surface but also to a certain curved surface.
[0023]
Further, the lock device 38 can move the frame portion 14 and the electric drill 12 by releasing the biasing of the presser plate 34 even when the suction plate 28 is fixed. Therefore, the lock device 38 moves the fixing position for each drilling operation. There is no need, and it is possible to continuously perform the drilling operation at a plurality of positions with the suction plate 28 fixed at a predetermined position, and extremely high work efficiency can be obtained.
[0024]
Further, since the lower surface of the suction plate 28 is in direct contact with the installation surface, only a very small space is formed by the shallow groove 52 between the installation surface and the lower surface of the suction plate 28. Therefore, the vacuum pump 64 and the pump motor MP that drives it may be small, and the drilling machine 10 can be reduced in weight and energy consumption can be reduced. Furthermore, since the space portion formed by the shallow groove 52 is small, the time required to reach the specified vacuum pressure is short, and thus an economical structure that is easy to use can be obtained.
[0025]
FIG. 7 shows a punch 10a according to another embodiment.
The punching machine 10a of this embodiment is different from the embodiment shown in FIGS. 1 to 6 only in that it includes two suction plates 28. Therefore, the same reference numerals are given to the same parts as those of the above-described embodiment. A detailed description thereof will be omitted.
In the present embodiment, the base portion 16 includes a base plate 78 on which two suction plates 28 are mounted. The base plate 78 has an internal passage 80 that communicates with the shallow groove 52 of each suction plate 28 via a communication hole 58 and a vertical hole 60, and a support surface 82 that supports the frame portion 14 is formed on the upper surface. is there. The fixed shaft 84 protrudes from the support surface 82, and the fixed shaft 84 is movably inserted into the long hole 26 formed in the bottom wall 24 of the frame portion 14, as in the above-described embodiment. A presser plate 34 and a nut 36 are attached to the tip protruding from the head. A vertical hole 86 communicating with the internal passage 80 is formed in the fixed shaft 84. Therefore, the vacuum pump 64 (through the suction pipe 66 to which the shallow groove 52 of each suction plate 28 is connected to the tip portion. 1). A valve mechanism that selectively connects the vacuum pump 64 only to the required suction plate 28 may be provided. Further, the number and arrangement positions of the suction plates 28 are not limited to those shown in FIG. 7 and can be appropriately selected as necessary.
[0026]
According to the drilling machine 10a of the present embodiment, by disposing the plurality of suction plates 28 apart from each other, it is possible to withstand a larger thrust load generated during the drilling operation. Further, by arranging the plurality of suction plates 28 along the curved surface, it can be directly fixed to a curved outer peripheral surface such as a large-diameter pipe.
[0027]
In each of the above-described embodiments, the frame portion 14 is directly placed on the support surfaces 30 and 82 of the suction plate 28 or the base plate 78. However, the present invention is not limited to this. For example, the frame portion 14 acts via the frame portion 14. An appropriate intermediate member such as a reaction member that transmits the reaction force of the work tool to the suction plate 28 or the base plate 78 or further to the installation surface is interposed between the support surfaces 30 and 82 and the frame portion 14. Also good. In the case where such an intermediate member is provided, the above-described locking device can be disposed on this intermediate member. Further, in order to facilitate the position adjustment of the frame portion 14 with respect to the support surfaces 30 and 82, an index such as a scale indicating the movement amount or movement direction of the frame portion 14 is provided on the support surfaces 30 and 82 or the intermediate member. It may be provided.
[0028]
【The invention's effect】
As apparent from the above, according to the portable working machine of the present invention, the elastic seal lip seals between the suction plate and the installation surface while the lower surface of the suction plate is in contact with the installation surface. Even if it changes to some extent, the tool can be reliably held at a correct position and with a required suction force while maintaining a constant posture. In addition, the position of the frame can be adjusted with respect to the support surface of the suction plate, so that the position of the work tool can be changed while the base is fixed, and the work efficiency can be increased and fixed. By urging the presser plate attached to the end of the shaft and the bottom wall of the frame part in a direction away from each other, the bottom wall is pressed against the support surface to fix the frame part, and this urging is released. By doing so, the lock device that allows the frame portion to move makes it very easy to adjust the position of the frame portion relative to the support surface.
[0029]
In addition, the base portion includes a base plate on which a plurality of suction plates having a groove open to the lower surface and connected to the vacuum pressure source and an elastic seal lip disposed on the peripheral portion are mounted. With the lower surface of the plate in contact with the installation surface, the space between the adsorption plate and the installation surface is sealed, and the suction plate is adsorbed and fixed to the installation surface by the vacuum pressure acting on the groove. A passage for communicating the groove of each suction plate to the vacuum pressure source is formed inside, and a support surface for supporting the frame portion is formed on the upper surface, and the position of the frame portion can be adjusted with respect to the support surface. In a portable work machine, when a plurality of suction plates mounted on a base plate are arranged along a curved surface, for example, it can be directly fixed to a curved outer peripheral surface such as a large-diameter pipe, and work efficiency is further improved. Increase.
[0030]
When these portable work machines are equipped with a safety device that disables the work tool when the vacuum pressure in the groove does not reach the specified value, the work tool is operated with a vacuum pressure for suction fixation. This increases the reliability of the work equipment.
[Brief description of the drawings]
FIG. 1 is a side view with a portion of a portable drilling machine according to a preferred embodiment of the present invention omitted.
FIG. 2 is an explanatory view taken along the line II-II in FIG.
FIG. 3 is an explanatory view taken along the line III-III in FIG.
FIG. 4 is an explanatory view showing the arrangement of shallow grooves formed on the lower surface of the suction plate.
5 is a simplified electrical circuit diagram of the drilling machine of FIG. 1. FIG.
6A and 6B are diagrams illustrating the operation of the lock device, in which FIG. 6A is an explanatory diagram in a state in which a frame portion is fixed to a suction plate, and FIG.
FIG. 7 is an enlarged schematic cross-sectional view showing a lower structure portion of a drilling machine according to another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Portable drilling machine (portable work machine), 12 ... Electric drill (working tool), 14 ... Frame part, 16 ... Base part, 26 ... Long hole (adjustment hole), 28 ... Adsorption plate, 30 ... Support Surface 32, Fixed shaft 34, Presser plate 38, Lock device 52, Shallow groove 54, Elastic seal lip 64, Vacuum pump (Vacuum pressure source)

Claims (3)

A portable working machine comprising a frame portion that supports a work tool and a base portion that is attracted to an installation surface facing a work position and supports the frame portion, and the base portion is formed on an upper surface, and the frame A suction plate having a support surface that supports the portion, a groove that opens to the lower surface and is connected to a vacuum pressure source, and an elastic seal lip that is disposed on the periphery, and the lower surface of the suction plate is installed on the lower surface of the suction plate The suction plate and the installation surface are sealed in contact with each other, and the suction plate is adsorbed and fixed to the installation surface by the vacuum pressure acting on the groove, and further fixed upward extending from the support surface. A shaft, an adjustment hole formed on the bottom wall of the frame portion slidable on the support surface, and movably inserted through the fixed shaft, and a presser attached to an end of the fixed shaft protruding from the adjustment hole The plate, the presser plate and the bottom wall A locking device that presses the bottom wall against the support surface by urging in a separating direction to fix the frame portion, and allows the frame portion to move by releasing the urging. A portable working machine characterized in that the position of a frame part can be adjusted with respect to the support surface . A portable working machine comprising a frame portion that supports a work tool and a base portion that is adsorbed to an installation surface facing a work position and supports the frame portion, wherein the base portion opens on a lower surface and has a vacuum pressure Comprising a base plate for mounting a plurality of suction plates having a groove connected to the source and an elastic seal lip disposed on the periphery , the elastic seal lip is in a state where the lower surface of the suction plate is in contact with the installation surface, The space between the suction plate and the installation surface is sealed, and the suction plate is sucked and fixed to the installation surface by the vacuum pressure acting on the groove. The base plate communicates the groove of each suction plate with the vacuum pressure source. A portable working machine characterized in that a passage is formed inside and a support surface for supporting the frame portion is formed on the upper surface, and the position of the frame portion can be adjusted with respect to the support surface. The portable work machine according to claim 1 or 2 , further comprising a safety device that disables the work tool when the vacuum pressure in the groove does not reach a specified value.

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