Box with USB socket and dust collecting sander having box with USB socket

Abstract

To provide a box with a USB socket which can be detachably attached to a dust collecting sander instead of a battery holder so that a mobile battery can also be used as a power source.SOLUTION: Provided is a box with a USB socket for connecting a mobile battery that can be detachably attached to the handle of a dust collection sander in place of a battery holder, which has an outer shape whose maximum width, maximum length and maximum height match the battery holder, the a box with the USB socket including: a box body in which the USB socket is built-in with a socket opening exposed to the outside; a connection terminal located on both longitudinal sides of the box body at positions corresponding to the positions of the connection terminals located on both longitudinal sides of the battery holder, which are electrically connected to a power supply circuit to the motor when the battery holder is attached to the power supply attachment section; and a lead wire that electrically connects the USB socket and the connection terminal inside the box body.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a box with a USB socket that can be similarly detachably attached to the main body of a dust-collecting sander, instead of a battery box that is detachably attached to the main body as a power source for the dust-collecting sander, and that allows a mobile battery to be used as a power source for the dust-collecting sander, and a dust-collecting sander equipped with such a box. [Background technology]

[0002] In the interior construction of buildings such as houses, for example, before wallpapering the ceiling or walls, putty is filled into joints and uneven areas to prepare the base, and the base surface is smoothed by sanding and polishing with a sander.

[0003] During such sanding work, dust, mainly consisting of putty powder, is generated. The putty powder is generated in large quantities as fine powder with a particle size of approximately 5 to 30 μm, so in order to efficiently collect this large amount of fine dust, electric dust collectors that can be connected to a sander and operated in conjunction with the sander are now being used.

[0004] However, a sander connected to an electric dust collector is difficult for workers to handle because it is also equipped with a dust collection hose and power supply means that connect the dust collector and the sander, which has a negative impact on work efficiency.

[0005] Therefore, the present applicant has proposed a cordless, hoseless dust-collecting sander that is easy to handle by incorporating a power supply and dust collection device into the main body (see, for example, Patent Document 1). This proposed dust-collecting sander has a battery holder that is detachably attached inside the handle when the handle cover is removed, and is equipped with a dust collection device that is powered by a dry cell battery or a storage battery (rechargeable battery) held in the battery holder.

[0006] In this type of dust-collecting sander, as shown in FIG. 7, the dust-collecting device 20 has a battery holder 50 attached to the handle portion (12a, 12b), and is equipped with a small motor portion 17 powered by a battery held in the battery holder 50, and a fan portion 18 driven by the motor portion 17.

[0007] The sander is provided with a suction chamber 19 that sucks dust-laden air from inside the cover member 21 that covers the center and peripheral edges of the backside of the sandpaper 16, which is detachably fastened to the support plate 11 of the handheld sander unit 13 via a hook-and-loop fastener member 15, through a suction passage that communicates with the inside of the cover member, using the suction flow generated by the rotation of the fan unit 18 while it is running. The dust-laden air sucked into the suction chamber 19 is discharged from the suction chamber 19 to an outlet 27 to which a dust bag 51 is attached, and the filtered dust is collected in the dust bag 51.

[0008] Typically, when a battery holder is used, nickel-metal hydride rechargeable batteries are preferred because they are relatively low cost and can be repeatedly charged and discharged. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Utility Model Registration No. 3209519 Summary of the Invention [Problem to be solved by the invention]

[0010] However, when using nickel-metal hydride rechargeable batteries as the power source for dust-collecting sanders, the cordless operation allows for comfortable sanding work, but the operating time is short, at around 45 minutes. Therefore, in interior construction sites with large construction areas, the battery holder needs to be replaced frequently, which is inconvenient, as it requires the user to have spare batteries on hand. Furthermore, a characteristic of nickel-metal hydride rechargeable batteries is that their power supply performance gradually decreases over operating time, which reduces dust collection performance and makes it difficult to work efficiently.

[0011] In view of the above problems, the object of the present invention is to provide a box with a USB socket that can be detachably attached to the handle of a dust-collecting sander in place of a battery holder, so that a mobile battery can also be used as the power source for the dust-collecting sander rather than relying solely on nickel-metal hydride rechargeable batteries. [Means for solving the problem]

[0012] In order to achieve the above object, the box with USB socket according to the invention described in claim 1 is formed inside the handle of a dust collecting sander, and is equipped with a USB socket for connecting a mobile battery that is detachably attached in place of a battery holder that holds a rechargeable battery as a power source for supplying power to the motor of the dust collecting device, in a power supply attachment section to which the battery holder is detachably attached, a box body having an outer shape that fits inside the handle portion and is attached to the power supply attachment portion, and the USB socket is built in with a socket opening exposed to the outside; connection terminals arranged on both longitudinal side surfaces of the box body, the connection terminals being electrically connected to a power supply circuit to the motor unit when the box body is attached to the power supply attachment portion; The box is characterized by having a lead wire inside the box body that electrically connects the USB socket and the connection terminal.

[0013] The box with a USB socket according to the invention of claim 2 is the box with a USB socket according to claim 1, characterized in that the box body has an external shape whose maximum width, maximum length, and maximum height match those of the battery holder, and the connection terminals are provided in the same position as the connection terminals of the battery holder.

[0014] The box with a USB socket according to the invention of claim 3 is the box with a USB socket according to claim 1 or 2, further comprising a sleep prevention board that is connected to the USB socket between the lead wires inside the box body and prevents the mobile battery from going into sleep mode, The sleep prevention board is characterized by having a sleep mode prevention circuit implemented therein that executes a sleep prevention operation by passing current through the USB socket for a short period of time at predetermined time intervals when the motor unit is not energized, and that stops the sleep prevention operation when power is supplied to the motor unit again within a predetermined stop time and when the elapsed time during the non-energized state exceeds the predetermined stop time.

[0015] The dust-collecting sander according to the invention of claim 4 is a dust-collecting sander equipped with the box with USB socket of claim 1, and is equipped with a hand-held sander unit that presents a substantially rectangular sanding surface for sanding the surface to be sanded, and a dust-collecting device that sucks in dust generated by sanding the surface to be sanded with this hand-held sander unit by negative pressure generated by a fan unit that rotates when driven by a motor unit, and discharges it from an outlet. The handheld sander is provided with an exchangeable battery holder that holds a battery as a power source for the motor and is detachably attached to the handle of the handheld sander, and a box with a USB socket that is detachably attached to the handle instead of the battery holder and to which a mobile battery is connected as the power source, The handle portion includes a handle body having a power supply mounting portion in an internal space of which the battery holder or the box with USB socket is replaceably mounted, and a handle cover that is detachably removed from the handle body to expose the internal space, the power supply attachment section includes a holding section that engages with and holds the battery holder or the box with USB socket on both longitudinal sides thereof, and in this engaged state electrically connects connection terminals provided on the both sides to a power supply circuit to the motor section; The handle body and / or the handle cover are characterized in that when the tip connector of the USB connection cord is inserted into the USB socket of the box with USB socket attached to the power supply mounting portion to connect the mobile battery, a recess is provided at the edge portion which forms an insertion hole through which the USB connection cord can be inserted from the inside to the outside of the handle portion when the handle cover is attached to the handle body. [Effects of the Invention]

[0016] The USB socket box of the present invention is detachably attached in place of the dust-collecting sander's battery holder, and can be connected to a mobile battery to power the dust-collecting sander. This significantly extends the operating time of the dust-collecting sander at interior construction sites compared to conventional methods that relied on rechargeable batteries as a power source, allowing for efficient, continuous sanding work even on large construction areas. Furthermore, the ability to use a mobile battery as a power source eliminates the problem of a decrease in the dust-collecting sander's dust-collecting performance due to a decrease in electrical capacity.

[0017] In addition, by installing a sleep prevention board in the box with a USB socket, the mobile battery will not go into sleep mode when work is stopped for a short time, allowing work to be resumed smoothly, which also contributes to further improving the efficiency of the entire work process. [Brief explanation of the drawings]

[0018] [Figure 1]1A and 1B are schematic external views showing a box with a USB socket according to an embodiment of the present invention attached to a dust-collecting sander, in which FIG. 1A is a side view and FIG. 1B is a plan view. [Figure 2] 1 shows external views of the box with a USB socket, where (a) is a side view, (b) is a front view when placed next to a conventional battery holder, (c) is a back view when placed next to a conventional battery holder, (d) is a plan view, and (e) is a bottom view when placed next to a battery holder. [Figure 3] 2A and 2B are partial perspective views showing the schematic configuration of the box with a USB socket in FIG. 1, where (a) is a side view and (b) is a plan view omitting the details of the board. [Figure 4] 2A and 2B are explanatory diagrams showing the schematic configuration of a sleep prevention board mounted on the box with a USB socket in FIG. 1, where FIG. 2A is a schematic plan view and FIG. 2B is a schematic circuit diagram. [Figure 5] 5 is a flowchart showing a sleep prevention operation by the sleep prevention board of FIG. 4. [Figure 6] 2 is an explanatory diagram showing a state in which the box with a USB socket shown in FIG. 1 is attached to a dust-collecting sander. FIG. [Figure 7] FIG. 2 is a side cross-sectional view of a conventional dust-collecting sander having a basic configuration common to that of the dust-collecting sander of FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0019] The box with USB socket of the present invention replaces the battery holder normally used as a power source for a dust collector and is removably attached to a power supply attachment section formed inside the handle of a dust collecting sander, and is equipped with a USB socket for connecting a mobile battery.The box with USB socket has an outer shape that fits inside the handle of the dust collecting sander and is attached to the power supply attachment section, and includes a box body with a built-in USB socket with the socket opening exposed to the outside, and connection terminals located on both longitudinal sides of the box body that are electrically connected to the power supply circuit to the motor when attached to the power supply attachment section, with the USB socket and the connection terminals electrically connected by lead wires inside the box body.

[0020] According to the above configuration, the box with USB socket of the present invention can be attached to the power supply attachment section of the handle of the dust-collecting sander instead of the battery holder, and at the same time, the USB socket is electrically connected to the power supply circuit to the motor section.Therefore, by simply inserting the connector at one end of the USB connection cord, which has a mobile battery connected to the other end, into the USB socket, the mobile battery can be easily used as a power source for the dust-collecting sander.

[0021] For example, while conventional nickel-metal hydride rechargeable batteries have a capacity of 1900mAh, currently commercially available mobile batteries have a capacity of over 10,000mAh. Therefore, using a mobile battery via the USB socket box of the present invention significantly extends the operating time of a dust-collecting sander at interior construction sites compared to conventional methods that rely solely on rechargeable batteries held in a battery holder as a power source, enabling efficient sanding work to continue even on large construction areas. Furthermore, using a mobile battery as a power source eliminates the problem of a dust-collecting sander's dust-collecting performance declining due to a decrease in the electrical capacity of nickel-metal hydride rechargeable batteries.

[0022] The battery holder attached to the handle of the dust-collecting sander is typically of a standard configuration, with spring terminals protruding from the inside to hold multiple, say four, rechargeable batteries, and snap terminals electrically connecting the batteries to each other located on both longitudinal sides.

[0023] On the other hand, the power supply attachment part on the dust-collecting sander side has a holding part in the internal space of the handle that engages with and holds the battery holder so that the connection terminals (snap terminals) located on both sides of the battery holder are electrically connected to the power supply circuit. Therefore, the number of batteries that the battery holder can hold and its external dimensions can be designed to fit the internal space of the handle, or an applicable battery holder can be selected from commercially available ones.

[0024] Therefore, since it is desirable that the box body of the USB socket box of the present invention, when attached to the power supply attachment section, fits securely into the internal space of the handle section of the dust collection sander, it is preferable that its external shape be substantially identical to the external shape of a battery holder that is normally used.

[0025] Therefore, it is simple to design the box so that its maximum width, length, and height match those of the battery holder, and to position the metal connection terminals in the same positions as those of the battery holder. This ensures that the box, when engaged with the power supply attachment section's retaining section, is electrically connected to the power supply circuit in the same way as the battery holder.

[0026] The box body, like the battery holder, is made of an insulating plastic that is lightweight and easy to mold into any shape, but is molded in a shape that allows the USB socket to be placed inside.To satisfy this requirement, the box body is preferably composed of an upper part and a lower part that are joined together to form a roughly cylindrical interior space.

[0027] In this case, the upper and lower parts have an inner shape capable of storing and holding the USB socket and lead wires, and are provided with a socket through-hole through which the socket opening of the USB socket is exposed to the outside. Furthermore, terminal through-holes through which the metal connection terminals are arranged from the inside to the outside may also be formed at predetermined positions on both longitudinal side surfaces of the box body.

[0028] Commercially available mobile batteries have a sleep mode function that automatically shuts off the power supply if no current is required for a certain period of time after the power supply time. When this sleep mode occurs, it can usually be resolved by unplugging and replugging the USB connector or by turning the power switch on and off on the mobile battery itself. During the polishing process, however, it is common for the motor to be temporarily stopped for a short period of time to perform some other task and then immediately resume polishing work. However, having to unplug and replug the connector or turn the power switch on and off every time the device goes into sleep mode and starts work again is a hassle and reduces work efficiency.

[0029] Therefore, it is desirable to provide a means for preventing the mobile battery from going into sleep mode whenever work is stopped for such a short period of time in the box with a USB socket of the present invention. That is, a sleep prevention board that prevents the mobile battery from going into sleep mode is provided inside the box and connected to the USB socket between the lead wires.

[0030] The sleep prevention board is equipped with a sleep mode prevention circuit that performs a sleep prevention operation by passing current through the USB socket for a short period of time at predetermined time intervals when the motor unit is not powered, and stops the sleep prevention operation when power is supplied to the motor unit again within a predetermined stop time, or when the time elapsed during the non-powered state exceeds the predetermined stop time.

[0031] The power-on time for the sleep prevention operation can be set appropriately within the range of, for example, 0.3 to 2 seconds, and the time interval can be set appropriately within the range of 5 to 20 seconds. The longer the power-on time and the shorter the time interval, the more power the battery will consume, and if the power-on time is short and the time interval is long, the device may go into sleep mode depending on the characteristics of the mobile battery, so it is important to set the time appropriately for each.

[0032] The sleep prevention function also stops when work is stopped for an extended period of time, such as several hours. Therefore, even if a mobile battery is left connected to the USB socket box attached to the dust collection sander after work is finished, power will not be supplied to the mobile battery, ensuring safety and preventing unnecessary power consumption.

[0033] By placing this sleep prevention board between the USB socket and the power supply circuit, the sleep prevention function prevents the device from going into sleep mode during short breaks, allowing you to resume work smoothly and without any hassle.In addition, using a mobile battery as the power source for the dust collection sander contributes to further improving the efficiency of the entire work process.

[0034] The USB socket box of the present invention, which has the above-mentioned configuration, can be installed in place of the battery holder for an existing dust-collecting sander, so no special or major modifications to the dust-collecting sander itself are necessary. Therefore, the dust-collecting sander product can be equipped with the USB socket box along with a standard battery holder. This dust-collecting sander, like the conventional one, is equipped with a dust collection device that receives power from these power sources attached to the handle.

[0035] When using the mobile battery, the USB connection cord with its connector plugged into the USB socket of the box with USB socket attached to the handle needs to be able to pass through the handle from the inside to the outside without any hindrance, so the handle is provided with an insertion hole for the USB connection cord.

[0036] That is, the handle portion comprises a handle body having a power supply attachment section in whose internal space a battery holder or a box with a USB socket can be replaceably attached, and a handle cover that can be detached from the handle body to expose the internal space. The handle body and / or the handle cover may have a recess on the edge thereof that forms an insertion hole through which the USB connection cord can be inserted from the inside to the outside of the handle portion when the handle cover is attached to the handle body.

[0037] Therefore, when attaching a box with a USB socket to the power supply attachment section of the handle body and inserting the tip connector of the USB connection cord into the USB socket to connect a mobile battery, the USB connection cord is fitted into the recess provided on the edge of the handle body and / or the handle cover, and the handle cover is then attached to the handle body, closing the recess to form an insertion hole, and the USB connection cord is inserted into the insertion hole.

[0038] In this way, the polishing work is performed with only the USB connection cord inserted on the outside and the USB socket and the connector inserted into it housed inside the handle, preventing the USB socket and connector from becoming dirty or clogged due to dust generated during the work, which could cause poor contact.In addition, the USB connection cord, which is fitted into the recessed part closest to the USB socket and connector, is pinched between the handle body and the handle cover, preventing the connector from coming loose from the USB socket during the work, and preventing damage to the USB socket and connector because the external USB connection cord is not subjected to stress such as pulling or twisting.

[0039] It should be noted that the recess only needs to be formed on one of the handle body and the handle cover, as long as it has a sufficient internal dimension to accommodate the USB connection cord. It is also possible to provide a recess on both sides, with the recesses butting against each other to form an insertion hole with sufficient internal dimensions. However, in terms of manufacturing effort, it is simpler to form a recess on only one side. [Example]

[0040] As an embodiment of the present invention, a box with a USB socket equipped with a sleep prevention board is shown in Figures 1 to 3, including the case where it is attached to a dust-collecting sander. Figure 1 is a schematic external view showing the box with a USB socket according to this embodiment attached to a dust-collecting sander, with (a) being a side view and (b) being a plan view. Figure 2 is an external view of the box with a USB socket according to this embodiment, with (a) being a side view, (b) being a front view when aligned with a conventional battery holder, (c) being a rear view when aligned with a conventional battery holder, (d) being a plan view, and (e) being a bottom view when aligned with a battery holder. Figure 3 is a partial see-through view showing the schematic configuration of the box with a USB socket according to this embodiment, with (a) being a side view and (b) being a plan view with the details of the board omitted.

[0041] As shown in FIG. 6, the box 1 with USB socket in this embodiment is formed inside the handle portion (12a, 12b) of the dust collecting sander 10 and is provided with a USB socket 7 that is detachably attached in place of the battery holder 50 to the holding portion (23a, 23b) of the power supply attachment portion 22 to which the battery holder 50 is detachably attached, the battery holder 50 holding a rechargeable battery as a power source for supplying power to the motor portion 17 of the dust collecting device 20, and into which the tip connector 32 of the USB connection cord 31 is inserted to connect the mobile battery 30 via the USB connection cord 31.

[0042] As shown in FIG. 2, the box 1 with USB socket in this embodiment has an insulating plastic box body made up of an upper part 2 and a lower part 8, which are joined together to form an internal space in which the necessary components can be stored.

[0043] The USB socket box 1 of this embodiment only needs to have an outer shape that allows it to be securely attached to the power supply attachment portion 22 of the handle body 12a and fit securely inside the box without rattle when closed by the handle cover 12b. Therefore, in this embodiment, the maximum outer shape of the box is set to match the maximum outer shape of the battery holder 50.

[0044] Specifically, at least the maximum vertical width W of the box body fits within the retaining sections (23a, 23b) and matches the maximum vertical width Wb of the battery holder 50. In this embodiment, as shown in Figure 2, the box body is designed with an outer shape whose maximum horizontal width D and maximum height H also match the maximum horizontal width Db and maximum height Hb of the battery holder 50. Furthermore, the positioning of each connection terminal T, described below, is the same as that of the connecting snap terminals S of the battery holder 50.

[0045] Therefore, there is no need to provide any special structure for attaching the box with USB socket 1 to the power supply attachment section 22 of the dust collecting sander 10. Much like the battery holder 50, the box with USB socket 1 is simply attached to the power supply attachment section 22 and held in the holding sections (23a, 23b), and each connection terminal T is electrically connected to the power supply circuit for supplying power from the power source to the motor section 17.

[0046] Therefore, the dust collecting sander 10 to be attached can be a dust collecting sander 10 manufactured with the same configuration and using the same manufacturing process as conventional ones. That is, as the dust collecting device 20, a battery holder 50 is detachably attached to a power supply attachment section 22 in the internal space of the handle body 12a to which the handle cover 12b is detachably attached, and a small motor section 17 powered by a battery held in the battery holder 50 and a fan section 18 driven by the motor section 17 are mounted.

[0047] The handheld sander unit 13 is provided with a suction chamber 19 that sucks dust-laden air from inside the cover member 21, which covers the center and peripheral edges of the backside of the sandpaper 16, through a suction passage that communicates with the inside of the cover member, by the suction flow generated by the rotation of the fan unit 18 while it is running. The dust-laden air sucked into the suction chamber 19 is discharged from the suction chamber 19 to an outlet 27 to which a dust bag 51 is attached, and the filtered dust is collected in the dust bag 51.

[0048] In this embodiment, a recess 24 is formed on the edge of the handle body 12a of the dust-collecting sander 10. When the handle cover 12b is attached to the handle body 12a, this recess 24 is closed by the edge of the handle cover 12b to form an insertion hole. This insertion hole allows the USB connection cord 31 to be inserted from the inside to the outside of the gripping portions (12a, 12b) without hindrance when the box with USB socket 1 is attached to the power supply attachment portion 22 instead of the battery holder 50 and the connector 32 of the USB connection cord 31 of the mobile battery 30 is inserted into the USB socket 7 of the box with USB socket 1.

[0049] This recess 24 allows only the USB connection cord 31 to be inserted on the outside, and the polishing work is performed with the USB socket 7 and the connector 32 inserted into it stored inside the handle, so the USB socket 7 and connector 32 are prevented from becoming dirty or clogged with dust generated during the work, and there is no risk of poor contact. Furthermore, the USB connection cord 31 fitted into the recess 24 closest to the USB socket 7 and connector 32 is sandwiched between the handle body 12a and the handle cover 12b, so the connector 32 is prevented from coming off the USB socket 7 during the work, and damage to the USB socket 7 and connector 32 is also prevented because stress such as pulling or twisting is not applied to the outer USB connection cord 31.

[0050] Both longitudinal side surfaces (2a, 2b) of the USB socket box 1 are integrally formed at both longitudinal ends of the upper portion 2 that constitutes the box body, and slit-shaped terminal openings (Fa, Fb) into which connection terminals (Ta, Tb) are fitted from the inside to the outside are formed at predetermined positions on both side surfaces (2a, 2b). In this embodiment, leaf-spring-shaped metal terminals are arranged in the terminal openings (Fa, Fb) as connection terminals (Ta, Tb).

[0051] The box 1 with a USB socket also has a built-in USB socket 7 into which the tip connector 32 of the USB connection cord 31 is inserted. In this embodiment, the upper portion 2 of the box 1 with a USB socket is recessed in the center, and a forward bulge 3 is formed having a stepped surface 4 rising in front of the recess 6. A through hole 4F is formed in the stepped surface 4, and the USB socket 7 is installed so that the socket opening is exposed to the outside from this through hole 4F.

[0052] Furthermore, in the internal space of the front bulge 3 of the upper part 2 and the internal space of the lower part 8 communicating therewith, the connection terminal Ta arranged on the front side surface 2a is electrically connected to the USB socket 7 by a lead wire La. Meanwhile, in the internal space of the rear bulge 5 formed behind the recess 6 of the upper part 2 and the internal space of the lower part 8, the connection terminal Tb arranged on the rear side surface 2b is electrically connected to the USB socket 7 by a lead wire Lb.

[0053] The USB socket 7 itself may be a USB input port that corresponds to the connector of a USB connection cord that is normally used for powering the mobile battery 30. In this embodiment, since the connector 32 of the USB connection cord 31 is a Type-C male connector, a Type-C female connector is used as the USB socket 7.

[0054] The recess 6 of the upper part 2 has an engagement hole 6F formed therein for use in joining the lower part 8, and the lower part 8 has an engagement claw 8P protruding therefrom and extending upward from the bottom surface. When the upper part 2 is placed on the lower part 8 and pressed down, the engagement claw 8P is pressed into the engagement hole 6F from below, engaging the two and joining the upper part 2 and the lower part 8 together integrally. Furthermore, by joining the two, the internal spaces of the two parts also become connected to each other.

[0055] In this embodiment, in order to prevent the mobile battery 30 from going into sleep mode during a short temporary work stoppage, a sleep prevention board 9, which is equipped with a sleep prevention circuit that performs a sleep prevention operation, is installed between the USB socket 7 and the lead wires (La, Lb). In practice, the USB socket 7 is mounted on the sleep prevention board 9.

[0056] The schematic configuration of the sleep prevention board 9 in this embodiment is shown in the explanatory diagram of Fig. 4. Fig. 4(a) is a schematic plan view of the sleep prevention board 9, and Fig. 4(b) is a schematic circuit diagram thereof. In this sleep prevention board 9, a transistor element Q1, in this case a MOSFET (metal-oxide-semiconductor field-effect transistor), is used as a switch by turning it on and off in response to an output signal from a one-chip microcomputer (microcontroller) U1, and controls the supply of sleep prevention current to terminal J1 of the USB socket 7 that supplies power to the mobile battery 30.

[0057] A memory unit, such as a flash ROM, of the microcomputer U1 stores a program for preventing sleep when the motor unit 17 is de-energized, i.e., when the power switch (SW) is turned off. The transistor element Q1 is turned on and off in accordance with this program, which repeatedly turns on and off the connection circuit A connected to the terminal J1 of the USB socket 7.

[0058] The program sets the time and interval for powering the mobile battery 30 via the USB socket 7 during sleep prevention operation. The program can be rewritten from terminal J2 using the MCLR / VPP / RA3 pin (pin 4), RA1 / ICSPCLK pin (pin 6), and RA0 / ICSPDAT / pin (pin 7) of the microcomputer U1, allowing the powering time and interval settings to be changed as needed.

[0059] As shown in FIG. 4( b), in the sleep prevention circuit of this embodiment, when the switch of the dust collecting sander 10 is turned on, power is supplied from the SW positive terminal J3 via the switch to terminal J4 and terminal J5, which is shorted to terminal J4, to the motor unit 17 (M in the circuit diagram), driving the fan unit 18 to rotate. When the switch is turned off and power supply to the motor unit 17 is stopped, the input from terminals J4 and J5 to the RA4 pin (pin 3) of the microcomputer U1 goes low, and the output from the RA2 pin (pin 5) alternates between high and low states. When this output is high, a voltage is applied to transistor element Q1, turning it on, energizing connection circuit A and allowing current to flow to the mobile battery 30 via the USB socket 7. When the output from the RA2 pin (pin 5) is low, transistor element Q1 goes off, stopping power supply to connection circuit A, i.e., power supply to the mobile battery 30 via the USB socket 7, resulting in a power outage. This repeated power supply and power outage prevents the mobile battery 30 from transitioning to sleep mode.

[0060] Furthermore, when the switch is turned on again to resume power supply to the motor unit 17, and the input from terminals J4 and J5 to the RA4 pin (pin 3) of the microcomputer U1 remains high, the output from the RA2 pin (pin 5) remains low, and a power outage continues for the connection circuit A. That is, during this time, normal power supply to the motor unit 17 continues, dust collection by rotational driving of the fan unit 18 continues, and unnecessary power supply for preventing sleep is not executed.

[0061] Furthermore, when the work process is completed and the power switch is turned off, power supply to motor unit 17 is stopped, and the input from terminals J4 and J5 to pin RA4 (pin 3) of microcomputer U1 goes low, sleep prevention operation resumes. Note that this sleep prevention circuit is configured so that while power is being supplied to connection circuit A during sleep prevention operation, light-emitting diode (LED) D1 lights up, allowing you to confirm that sleep prevention operation is being performed.

[0062] The process of the sleep prevention operation in the sleep prevention board 9 having the above configuration will be explained using the flow diagram in Figure 5 as an example in which the sleep prevention power-on time when the motor unit 17 and fan unit 18 are not powered is 0.5 seconds, the time interval is 10 seconds, i.e., the power outage time after the power-on time is 9.5 seconds, and the power-off elapsed time before the sleep prevention operation is stopped is set to 2 hours.

[0063] First, when the power switch (SW) of the dust collecting sander 10 is turned off to interrupt the sanding operation during the work process and it is recognized that the motor unit 17 and the fan unit 18 are no longer energized (S100), the sleep prevention circuit of the sleep prevention board 9 starts a sleep prevention operation (S101). In this sleep prevention operation, the USB socket 7 is energized for 0.5 seconds, followed by a power outage for 9.5 seconds, which are repeated (S102).

[0064] During this repetition of power on / off (S102), the time that has elapsed since the power switch (SW) was turned off is measured, and if the elapsed time does not exceed two hours and power is not restored to the motor unit 17 and fan unit 18, the sleep prevention operation repeatedly turns on power to the USB socket 7 for 0.5 seconds and then cuts off power for 9.5 seconds.

[0065] When work is resumed, the power switch (SW) of the dust collecting sander 10 is turned on, and once it is confirmed that power has been restored to the motor unit 17 and fan unit 18, the sleep prevention operation is terminated at that point (S105). This avoids the sleep mode of the mobile battery 30 due to a temporary stop, and work can be resumed smoothly without the hassle of reinserting the connector 32, thereby maintaining good work efficiency.

[0066] Furthermore, after the work is completely finished and the power switch (SW) is turned off, if two hours of non-powered operation have elapsed, the sleep prevention operation will end (S105) even if the mobile battery 30 remains connected to the dust collecting sander 10 via the USB socket box 1. This ensures safety and prevents unnecessary power consumption of the mobile battery 30. In a typical mobile battery 30, the mobile battery 30 itself will automatically power off after remaining in sleep mode for a certain period of time.

[0067] In the box with USB socket according to the present invention, the power-on time and time interval of the sleep prevention operation in the sleep prevention board 9, as well as the elapsed time of no power supply until the sleep prevention operation is stopped, are not limited to the settings in the above embodiment, but can be selected appropriately according to the characteristics of the mobile battery product being used. [Industrial Applicability]

[0068] The box with USB socket according to the present invention can be used not only for dust-collecting sanders, but also for mobile batteries for various cordless handheld power tools that are used with detachable battery holders, by giving it an external shape and terminal arrangement that can be used as an alternative to the battery holder. [Explanation of symbols]

[0069] 1: Box with USB socket 2: Upper part 2a: Side (front side) 2b: Side (back side) Fa,Fb: Opening for terminal Ta, Tb: Connection terminal La, Lb: Lead wires 3: Front bulge 4: Step surface 4F: Through hole 5: Rear bulge 6: Depression 6F: Engagement hole 7: USB socket 8: Lower part 8P: Engagement claw 9: Sleep prevention board 10: Dust collection sander 11: Support plate 12a: Handle body 12b: Handle cover 13: Handheld sander 15: Hook fastener material 16: Sandpaper 17: Motor section 18: Fan Club 19:Suction chamber 20: Dust collector 21: Cover member 22: Power supply attachment part 23a, 23b: Holding part 24: Recess 27: Outlet 30: Mobile battery 31: USB connection cord 32: Connector 50: Battery holder S: Snap terminal 51: Dust bag

Claims

1. A box with a USB socket is provided, which is provided with a USB socket for connecting a mobile battery, and is detachably attached in place of a battery holder that holds a rechargeable battery as a power source for supplying power to a motor part of a dust collecting device, and is formed inside a handle part of a dust collecting sander. a box body having an outer shape that fits inside the handle portion and is attached to the power supply attachment portion, and the USB socket is built in with a socket opening exposed to the outside; connection terminals arranged on both longitudinal side surfaces of the box body, the connection terminals being electrically connected to a power supply circuit to the motor unit when the box body is attached to the power supply attachment portion; A box with a USB socket, further comprising: a lead wire for electrically connecting the USB socket and the connection terminal inside the box body.

2. 2. The box with USB socket according to claim 1, wherein the box body has an outer shape whose maximum width, maximum length, and maximum height match those of the battery holder, and the connection terminals are provided in the same position as the connection terminals of the battery holder.

3. The box further includes a sleep prevention board connected to the USB socket between the lead wire and the box body, preventing the mobile battery from entering a sleep mode; The box with USB socket described in claim 1 or 2, characterized in that the sleep prevention board performs a sleep prevention operation by flowing current to the USB socket for a short period of time at predetermined time intervals when the motor unit is not powered, and is equipped with a sleep mode prevention circuit that stops the sleep prevention operation when power is supplied to the motor unit again within a predetermined stop time and when the elapsed time during the power non-supply period exceeds the predetermined stop time.

4. A dust-collecting sander includes a hand-held sander unit that presents a substantially rectangular file surface for sanding a surface to be sanded, and a dust-collecting device that sucks in dust generated by sanding the surface to be sanded with the hand-held sander unit using negative pressure generated by a fan unit that rotates when driven by a motor unit, and discharges the dust from an outlet. The handheld sander is provided with an exchangeable battery holder that holds a battery as a power source for the motor and is detachably attached to the handle of the handheld sander, and a box with a USB socket that is detachably attached to the handle instead of the battery holder and to which a mobile battery is connected as the power source, the handle portion comprises a handle body having a power supply mounting portion in an internal space of which the battery holder or the box with USB socket is replaceably mounted, and a handle cover that is detachably removed from the handle body to expose the internal space, the power supply attachment section includes a holding section that engages with and holds the battery holder or the box with USB socket on both longitudinal side surfaces thereof, and in this engaged state electrically connects connection terminals provided on the both side surfaces to a power supply circuit for the motor section; 2. A dust-collecting sander equipped with a box with a USB socket as described in claim 1, characterized in that the handle body and / or the handle cover have a recess on their edge that forms an insertion hole through which the USB connection cord can be inserted from the inside to the outside of the handle portion when the handle cover is attached to the handle body and the tip connector of the USB connection cord is inserted into the USB socket of the box with a USB socket attached to the power supply mounting portion to connect the mobile battery.

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