Patent Description:
Conventionally, as an oral cavity washing device, there has been known an oral cavity washing device including a device body in which a pump has been built, and a tank that includes a storage unit for storing liquid and slidably supports the device body (see PTL <NUM>). The device body is configured to be detachable from the tank. By detaching the device body from the tank, the tank can be cleaned.

Relevant prior art is also exemplified by <CIT>, <CIT>, and <CIT>. None of these documents disclose a tank comprising an openable bottom wall having attachment recesses comprising each an engagement projection protruding on its bottom side and being engageable with the corresponding attachment projection protruding from a lower part of an inner peripheral surface of the tubular body.

The present invention aims at improving the attachment of the opeanable bottom wall of the tank of an oral cavity washing device, and the invention is defined by claim <NUM>. Preferred embodiments are defined in the appended dependent claims.

In the oral cavity washing device disclosed in PTL <NUM>, the tank is integrally formed, and the bottom of the tank cannot be removed. For this reason, it is difficult to clean an inner bottom surface of the tank, and it is necessary to use a long cleaning brush or the like, so that cleaning performance of the tank is deteriorated.

The present disclosure has been made in view of such problems of the prior art. An object of the present disclosure is to provide an oral cavity washing device capable of improving cleaning performance of a tank.

An oral cavity washing device according to an aspect of the present disclosure comprises a device body that a pump is built in, and a tank detachably attached to the device body, the tank comprising a storage unit for storing liquid to be supplied to the device body, wherein the tank includes a bottom wall, at least a part of the bottom wall being formed to be openable.

According to the present disclosure, it is possible to provide an oral cavity washing device capable of improving cleaning performance of a tank.

Preferred embodiments are set out in the appended dependent claims.

Hereinafter, an exemplary embodiment will be described in detail with reference to the drawings. However, unnecessarily detailed description is omitted in some cases. For example, a detailed description of already well-known matters or a redundant description of substantially the same configuration may be omitted.

Note that the attached drawings and the following description are provided for those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter as recited in the claims.

As illustrated in <FIG>, oral cavity washing device <NUM> according to the present exemplary embodiment includes tank <NUM>, device body <NUM>, and nozzle <NUM>.

Tank <NUM> is formed in a bottomed tubular shape. The inside of tank <NUM> is, for example, storage unit <NUM> that stores liquid (hereinafter, water) such as water. In storage unit <NUM>, device body <NUM> is supported slidably in a length direction (hereinafter, referred to as a height direction. When oral cavity washing device <NUM> is not used, device body <NUM> is accommodated in storage unit <NUM>. When oral cavity washing device <NUM> is used, device body <NUM> is pulled out from storage unit <NUM>. In this case, water has been supplied to storage unit <NUM> of tank <NUM>.

Device body <NUM> is formed in a tubular shape in which both end sides in the height direction are closed. Device body <NUM> is provided with tube <NUM> disposed in storage unit <NUM> of tank <NUM>. A filter (not illustrated) for removing foreign substances mixed in the water stored in storage unit <NUM> is provided at a first end of tube <NUM>. A second end of tube <NUM> communicates with suction path <NUM> provided inside device body <NUM>. Suction path <NUM> communicates with pump <NUM> built in device body <NUM>, and supplies to pump <NUM> water in tank <NUM> sucked up by tube <NUM> by driving of pump <NUM>.

Pump <NUM> includes motor <NUM>, cam <NUM>, piston <NUM>, and pump chamber <NUM>. Motor <NUM> is driven by supply of electric power from a rechargeable battery (not illustrated) accommodated inside device body <NUM>. Cam <NUM> converts the rotation of motor <NUM> into an axial operating force. Piston <NUM> is reciprocated along the height direction of device body <NUM> by the axial operating force converted by cam <NUM>. An end portion of piston <NUM> is disposed in pump chamber <NUM>, and a volume of pump chamber <NUM> changes due to the reciprocating motion of piston <NUM>. Pump chamber <NUM> communicates with suction path <NUM> and discharge path <NUM> provided inside device body <NUM>. Note that a suction valve (not illustrated) is provided between pump chamber <NUM> and suction path <NUM>, and a discharge valve (not illustrated) is provided between pump chamber <NUM> and discharge path <NUM>.

When piston <NUM> is moved in a direction of increasing the volume of pump chamber <NUM> by driving of motor <NUM>, pump <NUM> causes water in tank <NUM> to flow into pump chamber <NUM> via tube <NUM> and suction path <NUM>. The water flowing into pump chamber <NUM> is discharged to nozzle <NUM> via discharge path <NUM> when piston <NUM> is moved in a direction of reducing the volume of pump chamber <NUM> by the driving of motor <NUM>.

Nozzle <NUM> is formed in a hollow elongated shape, and is detachable from device body <NUM>. The inside of nozzle <NUM> communicates with discharge path <NUM> in a state of being attached to device body <NUM>. Nozzle <NUM> jets the water flowing out of discharge path <NUM> from the tip thereof.

When such oral cavity washing device <NUM> is not used, nozzle <NUM> is removed from device body <NUM>, and device body <NUM> is pushed into tank <NUM> and stored in tank <NUM>. When oral cavity washing device <NUM> is used, device body <NUM> is pulled out from tank <NUM>, and nozzle <NUM> is attached to device body <NUM>. Details of oral cavity washing device <NUM> will be described below with reference to <FIG>.

As illustrated in <FIG>, device body <NUM> is formed in a tubular shape in which both end sides in the height direction are closed. Device body <NUM> has a cross-sectional shape formed in a perfect circle so as to be rotatable relative to tank <NUM>. As illustrated in <FIG>, <FIG>, <FIG>, and <FIG>, nozzle mounting portion <NUM> on which nozzle <NUM> is detachably disposed is provided on an upper surface of device body <NUM>. An end portion of nozzle <NUM> is inserted into nozzle mounting portion <NUM>, and an engaging portion (not illustrated) provided inside of nozzle mounting portion <NUM> is engaged with an engaged portion (not illustrated) of the end portion of nozzle <NUM> to hold a mounted state of nozzle <NUM>. When button <NUM> (see <FIG>) provided at an upper part of a side surface of device body <NUM> is pressed, nozzle <NUM> mounted on nozzle mounting portion <NUM> can be removed from device body <NUM> by disengaging the engaging portion from the engaged portion.

As illustrated in <FIG> and <FIG>, power supply switch <NUM> for starting or stopping oral cavity washing device <NUM> is provided on a side surface of device body <NUM>. Level selection switch <NUM> that switches output of motor <NUM> of pump <NUM> and switches discharge strength of water from nozzle <NUM> is provided below power supply switch <NUM> on the side surface of device body <NUM>. Display lamp <NUM> that displays an ON/OFF state of power supply switch <NUM>, a selection level of level selection switch <NUM>, and the like is provided below level selection switch <NUM> on the side surface of device body <NUM>. As illustrated in <FIG>, lid <NUM> for protecting a charging connector of a rechargeable battery built in device body <NUM> is provided on the upper side surface of device body <NUM> at a position different from display lamp <NUM> in the circumferential direction.

As illustrated in <FIG>, <FIG>, <FIG>, and <FIG>, tube <NUM> communicated with suction path <NUM> is integrally attached to a lower surface of device body <NUM>. Tube <NUM> has a length enough to reach a bottom of tank <NUM> when device body <NUM> is pulled out from tank <NUM> (see <FIG>). Tube <NUM> is accommodated in tank <NUM> in a state of being wound a plurality of times while device body <NUM> is accommodated in tank <NUM>. Coil spring <NUM> that holds an attitude extending in a length direction of tube <NUM> is disposed around tube <NUM>. By disposing coil spring <NUM>, tube <NUM> can be wound without being bent when device body <NUM> is accommodated in tank <NUM>, and tube <NUM> can be neatly accommodated in tank <NUM>. In addition, by disposing coil spring <NUM>, when device body <NUM> is pulled out from tank <NUM>, tube <NUM> can be neatly extended from a wound state.

As illustrated in <FIG> and <FIG>, nozzle accommodating portion <NUM> is provided on the side surface of device body <NUM>. Nozzle accommodating portion <NUM> is formed in a groove shape capable of accommodating nozzle <NUM>, and extends in the height direction of device body <NUM>. Nozzle <NUM> detached from device body <NUM> is accommodated in nozzle accommodating portion <NUM>. By providing nozzle accommodating portion <NUM> in device body <NUM>, nozzle <NUM> detached from device body <NUM> can be handled together with device body <NUM>. Therefore, it is not necessary to manage nozzle <NUM> detached from device body <NUM> separately from device body <NUM>, and nozzle <NUM> can be easily managed.

As illustrated in <FIG> and <FIG>, pull-out projection <NUM> protruding from the side surface of device body <NUM> is provided at a lower part of the side surface of device body <NUM>. Pull-out projection <NUM> extends in the circumferential direction of device body <NUM>. A plurality of (here, two) pull-out projections <NUM> are provided in the circumferential direction of the side surface of device body <NUM>. Pull-out projection <NUM> constitutes holding portion <NUM> that holds device body <NUM> in tank <NUM> when device body <NUM> is pulled out from tank <NUM>.

Accommodating projection <NUM> protruding from the side surface of device body <NUM> is provided below pull-out projection <NUM> on the side surface of device body <NUM>. Accommodating projection <NUM> extends in the circumferential direction of device body <NUM>. A plurality of (here, two) accommodating projections <NUM> are provided in the circumferential direction of the side surface of device body <NUM>. Accommodating projection <NUM> constitutes lock portion <NUM> that holds device body <NUM> in tank <NUM> when device body <NUM> is accommodated in tank <NUM>.

As illustrated in <FIG>, marking projection <NUM> protruding from the side surface of device body <NUM> is provided at an upper part of the side surface of device body <NUM>. Marking projection <NUM> constitutes marking portion <NUM> serving as a reference for positioning of lock portion <NUM> when device body <NUM> is accommodated in tank <NUM>.

As illustrated in <FIG> and <FIG>, at a lower part of device body <NUM>, lower packing <NUM> as a sealing member is attached in close contact with a groove formed continuously in the circumferential direction on an outer peripheral surface of device body <NUM>. An outer peripheral surface of lower packing <NUM> is in close contact with an inner peripheral surface of tank <NUM> in a state where device body <NUM> is attached to tank <NUM>, and seals a gap between device body <NUM> and tank <NUM>. Note that lower packing <NUM> is detachably attached to the groove of device body <NUM>, and only lower packing <NUM> can be cleaned by detaching lower packing <NUM> from device body <NUM>.

Such device body <NUM> is slidably supported by tank <NUM>. As illustrated in <FIG>, when oral cavity washing device <NUM> is used, device body <NUM> is pulled out from tank <NUM>. On the other hand, as illustrated in <FIG>, device body <NUM> is accommodated in tank <NUM> when oral cavity washing device <NUM> is not used.

Tank <NUM> is formed of, for example, a polypropylene resin or the like so as to be cleaned by a dishwasher, and is made transparent or translucent in order to improve designability. As illustrated in <FIG> and <FIG>, tank <NUM> is formed in a bottomed tubular shape in which one end side in the height direction is opened and the other end side is closed. The cross-sectional shape of tank <NUM> is a perfect circle such that device body <NUM> can rotate relatively. The inside of tank <NUM> is storage unit <NUM> that stores water. Storage unit <NUM> supports device body <NUM> slidably in the height direction. Storage unit <NUM> can accommodate a part other than an upper surface side of device body <NUM>. As representatively illustrated in <FIG> and <FIG>, tank <NUM> includes tubular body <NUM> and bottom wall <NUM>.

Tubular body <NUM> constitutes a peripheral wall of tank <NUM> and constitutes most of storage unit <NUM>. As illustrated in <FIG>, attachment projection <NUM> protruding from an inner peripheral surface of tubular body <NUM> is provided at a lower part of the inner peripheral surface of tubular body <NUM>. Attachment projection <NUM> extends in the circumferential direction of tubular body <NUM>. Engaging recess <NUM> is provided on an outer surface of attachment projection <NUM>. A plurality of (here, two) attachment projections <NUM> are provided in the circumferential direction of the inner peripheral surface of tubular body <NUM>. The lengths of the plurality of attachment projections <NUM>, <NUM> extending in the circumferential direction of tubular body <NUM> are different from each other. Attachment projection <NUM> constitutes attachment portion <NUM> that allows bottom wall <NUM> to be detachable from tubular body <NUM>.

As illustrated in <FIG>, bottom wall <NUM> constitutes a bottom wall of tank <NUM> that closes a lower opening of tubular body <NUM>, and constitutes the storage unit <NUM> in a state of being attached to tubular body <NUM>. As illustrated in <FIG>, on the outer peripheral side of bottom wall <NUM>, peripheral wall <NUM> that protrudes from the bottom surface toward tubular body <NUM> and is continuous in the circumferential direction is provided. The height of peripheral wall <NUM> is set such that user's finger reaches the bottom surface in a state where bottom wall <NUM> is removed from tubular body <NUM>. Since tank <NUM> is transparent, peripheral wall <NUM> is preferably as low as possible such that a boundary line between tubular body <NUM> and bottom wall <NUM> is not noticeable when bottom wall <NUM> is attached to tubular body <NUM>.

As illustrated in <FIG> and <FIG>, attachment recess <NUM> is provided on an outer surface of peripheral wall <NUM> of bottom wall <NUM>. An upper side of attachment recess <NUM> is opened, and one side in the circumferential direction of peripheral wall <NUM> is a bottom portion into which attachment projection <NUM> is inserted. Engagement projection <NUM> engageable with engagement recess <NUM> of attachment projection <NUM> is formed to protrude on a bottom side of attachment recess <NUM>. Between an opening and a bottom of attachment recess <NUM>, inclined surface <NUM> inclined upward from the bottom toward the opening is provided. A plurality of (here, two) attachment recesses <NUM> are provided in the circumferential direction of the outer peripheral surface of peripheral wall <NUM>. The opening lengths of the openings of the plurality of attachment recesses <NUM>, <NUM> with respect to the circumferential direction of peripheral wall <NUM> are different from each other. The opening lengths of the openings of the plurality of attachment recesses <NUM>, <NUM> correspond to extending lengths of the plurality of attachment projections <NUM>, <NUM> in the circumferential direction, respectively, such that the plurality of attachment projections <NUM>, <NUM> can be inserted. Attachment recess <NUM> constitutes attachment projection <NUM> of tubular body <NUM> and attachment portion <NUM> that allows bottom wall <NUM> to be detachable from tubular body <NUM>.

When bottom wall <NUM> is attached to tubular body <NUM>, first, corresponding attachment projections <NUM>, <NUM> are disposed with respect to the openings of attachment recesses <NUM>, <NUM> in attachment portion <NUM>. Next, tubular body <NUM> and bottom wall <NUM> are relatively moved in a direction approaching each other in the height direction so as to insert attachment projections <NUM>, <NUM> into the openings of attachment recesses <NUM>, <NUM>. Then, in a state where attachment projections <NUM>, <NUM> are inserted into attachment recesses <NUM>, <NUM>, tubular body <NUM> and bottom wall <NUM> are relatively rotated, and attachment projections <NUM>, <NUM> are inserted into the bottoms of attachment recesses <NUM>, <NUM>. At this time, engagement recess <NUM> of attachment projection <NUM> and engagement projection <NUM> of attachment recess <NUM> are engaged with each other, and an attachment state of bottom wall <NUM> with respect to tubular body <NUM> is maintained.

When bottom wall <NUM> is removed from tubular body <NUM>, first, tubular body <NUM> and bottom wall <NUM> are relatively rotated, and attachment projections <NUM>, <NUM> are removed from bottoms of attachment recesses <NUM>, <NUM> in attachment portion <NUM>. At this time, the engagement between engagement recess <NUM> of attachment projection <NUM> and engagement projection <NUM> of attachment recess <NUM> is released. Next, the relative rotation between tubular body <NUM> and bottom wall <NUM> is continued, attachment projections <NUM>, <NUM> are brought into contact with inclined surfaces <NUM>, <NUM> of attachment recesses <NUM>, <NUM>, and the relative rotation between tubular body <NUM> and bottom wall <NUM> is further continued. At this time, attachment projections <NUM>, <NUM> slide on inclined surfaces <NUM>, <NUM> to relatively move tubular body <NUM> and bottom wall <NUM> in a direction of separating from each other in the height direction. Attachment projections <NUM>, <NUM> that have finished sliding with inclined surfaces <NUM>, <NUM> are disposed in the openings of attachment recesses <NUM>, <NUM>. Then, bottom wall <NUM> can be removed from tubular body <NUM> by relatively moving tubular body <NUM> and bottom wall <NUM> in the direction of separating in the height direction.

Such attachment portion <NUM> has a screw structure in which attachment projection <NUM> and attachment recess <NUM> mesh with each other. Therefore, by rotating bottom wall <NUM> about an axis of tubular body <NUM>, bottom wall <NUM> can be attached to and detached from tubular body <NUM>. In such attachment portion <NUM>, extending lengths in the circumferential direction of the plurality of attachment projections <NUM>, <NUM> are different from each other. Therefore, an attachment position of bottom wall <NUM> with respect to tubular body <NUM> can be positioned at one position in the circumferential direction. Note that the attachment position of bottom wall <NUM> can be positioned by providing attachment portion <NUM> at one position in the circumferential direction, but since there is a possibility that rattling of bottom wall <NUM> with respect to tubular body <NUM> increases, it is preferable to provide attachment portion <NUM> at a plurality of positions in the circumferential direction.

Here, in the conventional tank, tubular body <NUM> and bottom wall <NUM> are formed of one continuous member. For this reason, in the conventional tank, bottom wall <NUM> cannot be removed from tubular body <NUM>, and a finger does not reach the bottom surface from the opening of the tank when cleaning the inner surface of the tank, and it is necessary to use a long cleaning brush or the like.

On the other hand, tank <NUM> includes tubular body <NUM> and bottom wall <NUM> detachably attached to tubular body <NUM> such that at least a part of the bottom wall can be opened. In such tank <NUM>, bottom wall <NUM> is removed from tubular body <NUM> when cleaning the inside of tank <NUM>. Since the finger reaches the inner bottom surface of bottom wall <NUM> detached from tubular body <NUM>, it is not necessary to use a long cleaning brush or the like. Therefore, the inner bottom surface in tank <NUM> can be easily cleaned. Further, since peripheral wall <NUM> of bottom wall <NUM> is set to a height at which a finger can reach the bottom surface, the inside of tank <NUM> can be easily cleaned.

As illustrated in <FIG>, <FIG>, and <FIG>, bottom packing <NUM> as a seal member is disposed between tubular body <NUM> and bottom wall <NUM>. As illustrated in <FIG>, <FIG>, bottom packing <NUM> is attached in close contact with groove <NUM> formed continuously in the circumferential direction on the outer peripheral surface of peripheral wall <NUM> of bottom wall <NUM>. Bottom packing <NUM> is detachable from groove <NUM>. On an outer peripheral surface of bottom packing <NUM>, a lip that is in close contact with the inner peripheral surface of tubular body <NUM> is formed continuously in the circumferential direction. Bottom packing <NUM> is in close contact with tubular body <NUM> and bottom wall <NUM> to seal a gap between tubular body <NUM> and bottom wall <NUM>. Note that groove <NUM> may be provided on the inner peripheral surface of tubular body <NUM>.

Here, in the conventional tank, a seal member such as bottom packing <NUM> is formed integrally with the tank, and the seal member cannot be removed unless a part of the tank is broken. In addition, when the seal member is disposed on a side of the bottom wall of the tank, it is difficult to clean the seal member, and dirt such as water stains and mold is likely to adhere to the seal member.

On the other hand, bottom packing <NUM> is detachably attached to groove <NUM> of bottom wall <NUM> detachably attached to tubular body <NUM>. Therefore, when bottom packing <NUM> is removed from tank <NUM> at the time of cleaning or the like, bottom packing <NUM> can be easily removed from groove <NUM> of bottom wall <NUM> by removing bottom wall <NUM> from tubular body <NUM>. In addition, since bottom packing <NUM> can be easily removed from tank <NUM>, bottom packing <NUM> can be easily cleaned, and bottom packing <NUM> can be maintained in a clean state.

As illustrated in <FIG> and <FIG>, an upper wall constituting groove <NUM> to which bottom packing <NUM> is attached is provided with notch <NUM> formed by cutting away so as to be separated from the outer peripheral surface of bottom packing <NUM>. Notch <NUM> enables a finger to abut on the outer peripheral surface of bottom packing <NUM> by inserting the user's finger. Therefore, bottom packing <NUM> attached to groove <NUM> can be easily removed from groove <NUM>. Note that a plurality of notches <NUM> may be provided in the circumferential direction of groove <NUM>.

Here, as a configuration in which at least a part of the bottom wall of tank <NUM> is formed to be openable, for example, tank <NUM> may be configured by tubular body <NUM> and bottom wall <NUM>, and detachable screw type attachment portion <NUM> may be provided between tubular body <NUM> and bottom wall <NUM>. In this configuration, bottom wall <NUM> can be attached to tubular body <NUM> or bottom wall <NUM> can be removed from tubular body <NUM> by relatively rotating tubular body <NUM> and bottom wall <NUM>. Note that, in this configuration, since tubular body <NUM> and bottom wall <NUM> are relatively rotated, it is necessary to form at least screw type attachment portion <NUM> as a cylinder. In addition, tank <NUM> may be configured by tubular body <NUM> and bottom wall <NUM>, and for example, bottom wall <NUM> may be configured openably and closably with respect to tubular body <NUM> via attachment portion <NUM> including a hinge or the like. Furthermore, tank <NUM> may be configured by tubular body <NUM> and bottom wall <NUM>, and for example, bottom wall <NUM> may be configured to be detachable from tubular body <NUM> via attachment portion <NUM> including a fitting portion or the like fitted by sliding in the height direction or a left-right direction.

Further, as another configuration, for example, tank <NUM> is configured by one continuous member of tubular body <NUM> and bottom wall <NUM>, and an opening communicating with the inner bottom surface of bottom wall <NUM> is provided with respect to bottom wall <NUM>, and a lid for closing the opening is provided. In this configuration, the opening of bottom wall <NUM> is preferably opened such that a finger can be inserted to clean the entire bottom surface inside bottom wall <NUM>. It is preferable that the lid that closes the opening can hold a state in which the opening is closed, for example, by openably and closably providing the lid on bottom wall <NUM> via a hinge, providing an engaging portion engageable with bottom wall <NUM> at least at one place, or fitting the lid entirely to bottom wall <NUM>.

Here, in the conventional tank, since tubular body <NUM> and bottom wall <NUM> are formed of one continuous member and at least a part of bottom wall <NUM> is not opened, water remaining in the tank cannot be discarded in a state where device body <NUM> is attached to the tank. Therefore, in the conventional tank, it is necessary to remove device body <NUM> from the tank when water remaining in the tank is discarded. In addition, when device body <NUM> is removed from the tank, water remaining in the tank may be splashed around the tank.

On the other hand, tank <NUM> is formed such that at least a part of the bottom wall can be opened. Therefore, when water remaining in tank <NUM> is discarded, the water can be discarded from the opening, and it is not necessary to remove device body <NUM> from tank <NUM>. In addition, since the water remaining in tank <NUM> can be discarded without removing device body <NUM> from tank <NUM>, it is possible to suppress the water remaining in tank <NUM> from splashing around. Therefore, it is possible to reduce a burden of cleaning the periphery of oral cavity washing device <NUM> after use.

Device body <NUM> is supported by such tank <NUM> so as to be slidable in the height direction. As illustrated in <FIG>, <FIG>, and <FIG>, when oral cavity washing device <NUM> is used, device body <NUM> is pulled out from tank <NUM>. Device body <NUM> is held in a pull-out state pulled out from tank <NUM> by holding portion <NUM>. On the other hand, as representatively illustrated in <FIG> and <FIG>, when use of oral cavity washing device <NUM> is finished, device body <NUM> is accommodated in tank <NUM>. An accommodated state of device body <NUM> accommodated in tank <NUM> is held by lock portion <NUM>.

As illustrated in <FIG> and <FIG>, holding portion <NUM> includes pull-out projection <NUM> of device body <NUM>, and pull-out recess <NUM> provided in tank <NUM> engageable with pull-out projection <NUM>. Pull-out recess <NUM> is also illustrated in <FIG>. Pull-out recess <NUM> is provided at an upper part of the inner peripheral surface of tubular body <NUM> of tank <NUM> so as to be engageable with pull-out projection <NUM> of device body <NUM>. Pull-out recess <NUM> is formed continuously in the circumferential direction of tubular body <NUM> so as to be engageable with the plurality of pull-out projections <NUM>, <NUM>.

When device body <NUM> is pulled out from tank <NUM>, pull-out projection <NUM> and pull-out recess <NUM> are engaged with each other, and holding portion <NUM> holds device body <NUM> at a pull-out position with respect to tank <NUM>. Note that by pulling out device body <NUM> from the pull-out position of tank <NUM>, the engagement of holding portion <NUM> is released, and device body <NUM> can be detached from tank <NUM>. In such holding portion <NUM>, pull-out projection <NUM> is provided at a position where tank <NUM> overlaps with pull-out projection <NUM> in a front view in a state where device body <NUM> is attached to tank <NUM>. Therefore, in the state where device body <NUM> is attached to tank <NUM>, pull-out projection <NUM> is not exposed from tank <NUM> in a front view, and unnecessary unevenness can be hidden, so that designability can be improved.

As illustrated in <FIG> and <FIG>, lock portion <NUM> includes accommodating projection <NUM> of device body <NUM>, and accommodating recess <NUM> provided in tank <NUM> engageable with accommodating projection <NUM>. Accommodating recess <NUM> is also illustrated in <FIG>. Accommodating recess <NUM> is provided on the inner peripheral surface of peripheral wall <NUM> of bottom wall <NUM> of tank <NUM> so as to be engageable with accommodating projection <NUM> of device body <NUM>. Accommodating recess <NUM> extends in the circumferential direction of peripheral wall <NUM>. The extension length in the circumferential direction of accommodating recess <NUM> is set to be longer than the extension length in the circumferential direction of accommodating projection <NUM>. A plurality of (here, two) accommodating recesses <NUM> are provided in the circumferential direction of the inner peripheral surface of peripheral wall <NUM> so as to be engageable with the plurality of accommodating projections <NUM>, <NUM>. Inclined surfaces <NUM>, <NUM> inclined upward from the lower side to the upper side are provided on both sides in the circumferential direction of accommodating recess <NUM>.

When device body <NUM> is accommodated in tank <NUM>, in such lock portion <NUM>, accommodating projection <NUM> and accommodating recess <NUM> are engaged with each other to hold device body <NUM> at an accommodating position with respect to tank <NUM>. Note that, at this time, although not illustrated, tube <NUM> is accommodated between device body <NUM> and tank <NUM> in a state of being wound a plurality of times. Lower packing <NUM> is disposed above accommodating projection <NUM>. By disposing lower packing <NUM> above accommodating projection <NUM>, lower packing <NUM> does not interfere with accommodating recess <NUM> when device body <NUM> is accommodated in tank <NUM> or when device body <NUM> is pulled out from tank <NUM>, and wear of lower packing <NUM> can be reduced.

Conventionally, when device body <NUM> held by lock portion <NUM> is pulled out from tank <NUM>, device body <NUM> is gripped and pulled out from tank <NUM> to disengage lock portion <NUM>. However, for example, when water or the like adheres to device body <NUM>, device body <NUM> may slip, and device body <NUM> may not be pulled out from tank <NUM>. In such a case, it is difficult to release the engagement of lock portion <NUM>.

Therefore, as illustrated in <FIG>, accommodating recess <NUM> of lock portion <NUM> is provided with inclined surfaces <NUM>, <NUM> on both sides in the circumferential direction of peripheral wall <NUM>, that is, on both sides in a relative rotation direction between device body <NUM> and tank <NUM>. Therefore, by relatively rotating device body <NUM> and tank <NUM>, accommodating projection <NUM> and inclined surface <NUM> are brought into contact with each other, and accommodating projection <NUM> moves while sliding along inclined surface <NUM>. When accommodating projection <NUM> moves along inclined surface <NUM>, device body <NUM> is moved upward to come out of tank <NUM>. When device body <NUM> moves upward, the engagement between accommodating projection <NUM> and accommodating recess <NUM> is released at lock portion <NUM>. In a state where the engagement of lock portion <NUM> is released, device body <NUM> can be easily pulled out from tank <NUM>.

In such lock portion <NUM>, even when device body <NUM> slides, the engagement of lock portion <NUM> can be easily released by relatively rotating device body <NUM> and tank <NUM>. Therefore, device body <NUM> can be easily pulled out from tank <NUM>. In the state in which the engagement of lock portion <NUM> is released, accommodating projection <NUM> moves along inclined surface <NUM>, so that device body <NUM> is moved in a direction in which device body <NUM> is pulled out from tank <NUM>. Therefore, an area for gripping device body <NUM> is increased, and device body <NUM> can be more easily pulled out from tank <NUM>.

Note that, as the lock portion that can release the engagement by relatively rotating device body <NUM> and tank <NUM>, for example, inclined surfaces <NUM>, <NUM> may not be provided on both sides in the circumferential direction of accommodating recess <NUM>. In this case, by relatively rotating device body <NUM> and tank <NUM>, engagement projection <NUM> is positioned outside a range of accommodating recess <NUM>, so that the engagement of the lock portion is released. Even with such a lock portion, device body <NUM> can be easily pulled out from tank <NUM>.

Accommodating projection <NUM> constituting such lock portion <NUM> is provided on the side surface of device body <NUM> at a position where tank <NUM> overlaps with accommodating projection <NUM> in a front view when device body <NUM> is pulled out from tank <NUM>. Therefore, as illustrated in <FIG>, in the state where device body <NUM> is pulled out from tank <NUM>, accommodating projection <NUM> is not exposed from tank <NUM> in a front view, and unnecessary unevenness can be hidden, so that designability can be improved.

Such lock portion <NUM> is provided inside tank <NUM>, and even if tank <NUM> is formed to be transparent, it is difficult to see engagement or disengagement. Therefore, as illustrated in <FIG> and <FIG>, marking portion <NUM> that serves as a guide of the engagement state of lock portion <NUM> is provided in a portion visible from the outside of tank <NUM>.

As illustrated in <FIG> and <FIG>, marking portion <NUM> includes marking projection <NUM> of device body <NUM>, and marking recess <NUM> provided in tank <NUM> engageable with marking projection <NUM>. Marking recess <NUM> is provided at an upper opening edge of tubular body <NUM> of tank <NUM> so as to be engageable with marking projection <NUM>. Marking recess <NUM> has a bottom portion engaging with marking projection <NUM>, and is provided with inclined surfaces <NUM>, <NUM> inclined upward on both sides in the circumferential direction from the bottom portion.

When marking projection <NUM> of device body <NUM> is engaged with the bottom portion of marking recess <NUM> of tank <NUM>, marking portion <NUM> indicates that accommodating projection <NUM> and accommodating recess <NUM> are engaged with each other in lock portion <NUM>. Therefore, the user can recognize that lock portion <NUM> is engaged by visually recognizing the engagement between marking projection <NUM> and marking recess <NUM>.

When device body <NUM> and tank <NUM> are relatively rotated, marking portion <NUM> moves while marking projection <NUM> slides along inclined surface <NUM>. When marking projection <NUM> moves along inclined surface <NUM>, device body <NUM> is moved upward to come out of tank <NUM>. Therefore, it is possible to assist disengagement of lock portion <NUM>. When marking projection <NUM> finishes the movement of inclined surface <NUM>, as illustrated in <FIG>, it can be seen that marking projection <NUM> is disposed at an opening edge of tubular body <NUM>, and that the engagement between accommodating projection <NUM> and accommodating recess <NUM> is released at lock portion <NUM>. Therefore, the user can recognize that the engagement of lock portion <NUM> is released by visually recognizing the release of the engagement between marking projection <NUM> and marking recess <NUM>.

Here, as illustrated in <FIG>, drying hole <NUM> penetrating a peripheral wall of tubular body <NUM> is provided at an upper part of a side surface of tubular body <NUM> of tank <NUM>. Drying hole <NUM> is disposed to face nozzle accommodating portion <NUM> of device body <NUM> in the state where device body <NUM> is accommodated in tank <NUM>. By providing drying hole <NUM> in tank <NUM> in this manner, nozzle <NUM> accommodated in nozzle accommodating portion <NUM> can be dried. Drying hole <NUM> is disposed to face a bottom wall side of nozzle accommodating portion <NUM> of device body <NUM> in the state where device body <NUM> is pulled out from tank <NUM>. By disposing drying hole <NUM> in this manner, the water accumulated in nozzle accommodating portion <NUM> can be discharged from drying hole <NUM>.

In oral cavity washing device <NUM>, tank <NUM> is constructed with tubular body <NUM> and detachable bottom wall <NUM>, so that bottom wall <NUM> can be removed to supply water to storage unit <NUM> in tank <NUM>. However, for example, when water is poured in a wash basin or the like, there is no problem as long as it is a water supply port of a type that can be expanded like a shower type or the like, but in a water supply port of a type that cannot be expanded, it may be difficult to supply water in a state where tank <NUM> from which bottom wall <NUM> has been removed is vertical. Therefore, it is preferable that water can be supplied to storage unit <NUM> in tank <NUM> even in a state where tank <NUM> is laid down.

Therefore, as illustrated in <FIG>, liquid supply hole <NUM> for injecting water into storage unit <NUM> is formed in the side surface of tank <NUM>. As illustrated in <FIG> and <FIG>, liquid supply hole <NUM> is formed in a tubular shape protruding from the side surface of tank <NUM>. Liquid supply hole <NUM> is disposed so as to be positioned below lower packing <NUM> in the state where device body <NUM> is pulled out from tank <NUM>. Furthermore, liquid supply hole <NUM> is disposed so as to be positioned above lower packing <NUM> in the state where device body <NUM> is accommodated in tank <NUM>. By disposing liquid supply hole <NUM> in this manner, liquid supply hole <NUM> does not interfere with lower packing <NUM>, and the sealability of lower packing <NUM> can be maintained. As illustrated in <FIG>, liquid supply hole <NUM> is closed by liquid supply lid <NUM>.

As illustrated in <FIG>, liquid supply lid <NUM> is provided with closing portion <NUM> having an outer diameter larger than an outer diameter of liquid supply hole <NUM>. The contour of closing portion <NUM> is formed such that both sides in a vertical direction are formed by curved surfaces, and both sides in a horizontal direction are formed as straight track ellipses. An outer surface of closing portion <NUM> is curved along a side surface shape of tank <NUM>. By forming closing portion <NUM> in this manner, designability can be enhanced. On an inner surface of closing portion <NUM>, peripheral wall <NUM> that protrudes toward liquid supply hole <NUM> and can be inserted into an inner periphery of liquid supply hole <NUM> is formed continuously in the circumferential direction. As illustrated in <FIG>, liquid supply lid <NUM> is attached to tank <NUM> openably and closably in the vertical direction via hinge <NUM>. For example, liquid supply lid <NUM> may be provided openably and closably in a left-right direction with respect to tank <NUM> via hinge <NUM>, and an opening and closing direction of liquid supply lid <NUM> may be any direction.

As illustrated in <FIG> and <FIG>, hinge <NUM> includes shaft <NUM> provided in tank <NUM>, and hook <NUM> provided in liquid supply lid <NUM> rotatably engaged with shaft <NUM>. Hook <NUM> is also illustrated in <FIG>. Since hinge <NUM> includes shaft <NUM> and hook <NUM>, liquid supply lid <NUM> can be detachable from tank <NUM>. Therefore, only liquid supply lid <NUM> can be cleaned. Note that hook <NUM> may be provided in tank <NUM>, and shaft <NUM> may be provided in liquid supply lid <NUM> to form hinge <NUM>. Further, the hinge may be formed continuously with tank <NUM> and liquid supply lid <NUM>.

As illustrated in <FIG>, hinge <NUM> is provided at a position entirely hidden by closing portion <NUM> of liquid supply lid <NUM> in a front view. By hiding hinge <NUM> with liquid supply lid <NUM>, hinge <NUM> can be protected, and breakage of hinge <NUM> can be suppressed. In addition, it is possible to increase the strength of hook <NUM> and improve the strength of hinge <NUM> without providing hook <NUM> at an end of liquid supply lid <NUM>. Note that at least a part of hinge <NUM> may be hidden by liquid supply lid <NUM> in a front view. In addition, when hinge <NUM> has high strength, hinge <NUM> may not be hidden by liquid supply lid <NUM>. Hinge <NUM> is disposed at a position that is not touched by a user's finger when the user grips bottom wall <NUM> and attaches and detaches bottom wall <NUM> to and from tubular body <NUM>. By disposing hinge <NUM> in this manner, bottom wall <NUM> can be easily attached to and detached from tubular body <NUM> without interfering with hinge <NUM>.

As illustrated in <FIG> and <FIG>, liquid supply packing <NUM> as a seal member is disposed between liquid supply hole <NUM> and liquid supply lid <NUM>. As illustrated in <FIG>, liquid supply packing <NUM> is attached in close contact with groove <NUM> formed continuously in the circumferential direction on the outer peripheral surface of peripheral wall <NUM> of liquid supply lid <NUM>. Liquid supply packing <NUM> is detachable from groove <NUM>. An outer peripheral surface of liquid supply packing <NUM> is in close contact with the inner peripheral surface of liquid supply hole <NUM> in a state where liquid supply hole <NUM> is closed by liquid supply lid <NUM>. Liquid supply packing <NUM> is in close contact with liquid supply hole <NUM> and liquid supply lid <NUM> to seal a gap between liquid supply hole <NUM> and liquid supply lid <NUM>. Note that groove <NUM> may be provided on the inner peripheral surface of liquid supply hole <NUM>.

An upper wall portion constituting groove <NUM> to which liquid supply packing <NUM> is attached is provided with notch <NUM> formed by cutting away so as to be separated from the outer peripheral surface of liquid supply packing <NUM>. A plurality of (here, two) notches <NUM> are provided in the circumferential direction of groove <NUM>. Notch <NUM> may be provided at one location in the circumferential direction of groove <NUM>. Notch <NUM> enables a finger to abut on the outer peripheral surface of liquid supply packing <NUM> by inserting the finger of the user. Therefore, liquid supply packing <NUM> attached to groove <NUM> can be easily removed from groove <NUM>.

Herein, conventionally, when liquid supply lid <NUM> is opened with respect to liquid supply hole <NUM>, the end portion of liquid supply lid <NUM> protrudes from the side surface of tank <NUM> in a front view. Therefore, for example, when tank <NUM> is dropped in a state where liquid supply lid <NUM> is opened, a protruding end portion of liquid supply lid <NUM> collides with a peripheral member, and hinge <NUM> holding liquid supply lid <NUM> may be damaged.

On the other hand, as illustrated in <FIG> and <FIG>, the end portion of liquid supply lid <NUM> is disposed within a range of the side surface of tank <NUM> in a front view in a state where liquid supply lid <NUM> is opened. Specifically, the end portion of liquid supply lid <NUM> on a side opposite to hinge <NUM> is disposed at a position not protruding from a lower end of the side surface of tank <NUM> in a front view in a state where liquid supply lid <NUM> is opened. Therefore, it is possible to suppress interference of the end portion of liquid supply lid <NUM> with the peripheral member in the state where liquid supply lid <NUM> is opened, and it is possible to suppress the influence on hinge <NUM>.

In such oral cavity washing device <NUM>, tank <NUM> is formed such that at least a part of bottom wall <NUM> can be opened. Therefore, a finger can reach the bottom surface on the inner side of tank <NUM> from a portion where an opening of bottom wall <NUM> is formed, and it is not necessary to use a long cleaning brush or the like, and cleaning can be easily performed.

Therefore, in such oral cavity washing device <NUM>, cleaning performance of tank <NUM> can be improved.

Furthermore, device body <NUM> is slidably supported by tank <NUM> between an accommodated state in which the device body is accommodated in tank <NUM> and a pull-out state in which the device body is pulled out from tank <NUM>. Therefore, even in oral cavity washing device <NUM> of tank telescopic type, cleaning performance of tank <NUM> can be improved.

Further, tank <NUM> includes tubular body <NUM> and bottom wall <NUM> detachably attached to tubular body <NUM>. Therefore, since bottom wall <NUM> can be separated from tubular body <NUM>, the inside of tank <NUM> can be cleaned more easily. In addition, after use, liquid remaining in tank <NUM> can be discarded more reliably.

Between tubular body <NUM> and bottom wall <NUM>, attachment portion <NUM> that holds an attached state between tubular body <NUM> and bottom wall <NUM> is formed. Then, in attachment portion <NUM>, bottom wall <NUM> is relatively rotated with respect to tubular body <NUM>, whereby the holding of the attached state between tubular body <NUM> and bottom wall <NUM> is released. Therefore, bottom wall <NUM> can be easily attached to and detached from tubular body <NUM>.

Further, attachment portion <NUM> has a screw structure that engages with each other, and bottom wall <NUM> is attached to and detached from tubular body <NUM> by rotating bottom wall <NUM> about an axis of tubular body <NUM>. Therefore, bottom wall <NUM> can be easily attached to and detached from tubular body <NUM>.

Furthermore, bottom packing <NUM> as a seal member that seals a gap between tubular body <NUM> and bottom wall <NUM> is detachably attached between tubular body <NUM> and bottom wall <NUM>. Therefore, only bottom packing <NUM> can be cleaned after bottom packing <NUM> is removed, and bottom packing <NUM> can be maintained in a clean state. In addition, bottom packing <NUM> can be easily cleaned.

Further, bottom wall <NUM> is provided with groove <NUM> that holds bottom packing <NUM>. In groove <NUM>, notch <NUM> separated from an outer peripheral surface of bottom packing <NUM> is formed. Therefore, in notch <NUM>, an exposed area of the outer peripheral surface of bottom packing <NUM> can be increased, and bottom packing <NUM> can be easily removed from groove <NUM>.

In the oral cavity washing device according to the present exemplary embodiment, the device body is a tank telescopic type in which the device body is slidably supported by the tank. However, the present disclosure is not limited to this. For example, the present disclosure is also applicable to tank-separated type oral cavity washing device <NUM> as illustrated in <FIG>. In tank-separated type oral cavity washing device <NUM> illustrated in <FIG>, tank <NUM> is detachably attached to device body <NUM>. Note that nozzle <NUM> is detachably attached to device body <NUM>. Even in such tank-separated type oral cavity washing device <NUM>, cleaning performance can be improved by making at least a part of bottom wall <NUM> openable. Note that, in tank-separated type oral cavity washing device <NUM> illustrated in <FIG>, tank <NUM> is constructed with tubular body <NUM> and bottom wall <NUM> detachably attached to tubular body <NUM>. In addition, liquid supply lid <NUM> that closes the liquid supply hole is detachably or openably-and-closably attached to tubular body <NUM>.

Claim 1:
An oral cavity washing device (<NUM>), comprising:
a device body (<NUM>) that a pump (<NUM>) is built in;
a tank (<NUM>) detachably attached to the device body (<NUM>), the tank (<NUM>) comprising a storage unit (<NUM>) for storing liquid to be supplied to the device body (<NUM>), wherein the tank (<NUM>) includes a bottom wall (<NUM>), at least a part of the bottom wall (<NUM>) being formed to be openable, and the tank (<NUM>) comprises a tubular body (<NUM>) and the bottom wall (<NUM>) detachably attached to the tubular body (<NUM>), and
an attachment portion (<NUM>) that holds an attached state between the tubular body (<NUM>) and the bottom wall (<NUM>) is formed between the tubular body (<NUM>) and the bottom wall (<NUM>), wherein
the attachment portion (<NUM>) comprises a plurality of attachment projections (<NUM>) protruding from a lower part of an inner peripheral surface of the tubular body (<NUM>), and a plurality of attachment recesses (<NUM>) provided on an outer peripheral surface of the bottom wall (<NUM>),
each attachment projection (<NUM>) extends in a circumferential direction of the tubular body (<NUM>) and comprises an engaging recess (<NUM>) on its outer surface,
each attachment recess (<NUM>) comprises an engagement projection (<NUM>) protruding on its bottom side and being engageable with the engagement recess (<NUM>) of the attachment projection (<NUM>),
opening lengths of the plurality of attachment recesses (<NUM>) correspond to extending lengths of the plurality of attachment projections (<NUM>) in the circumferential direction, and
in the attachment portion (<NUM>), the bottom wall (<NUM>) is configured to be relatively rotated with respect to the tubular body (<NUM>) to release holding of the attached state between the tubular body (<NUM>) and the bottom wall (<NUM>).