JP4738991B2 - Door opening and closing device - Google Patents

Description

  The present invention relates to a door opening and closing device that opens and closes a door with respect to a base via a rotation mechanism. In this specification, the “base” includes various cases, housings, and the like, and the “door” has a broad meaning including a lid, a shielding plate, and the like. Further, the “latch mechanism” has substantially the same meaning as a lock or locking mechanism.

  FIG. 11 shows the door opening and closing device of Patent Document 1, in which (a) shows the door closed position and (b) shows the door open position. In this door opening / closing device, the door 3 is switched to a closed position and an open position with respect to the base body 2 via a rotation mechanism, and is releasably locked via a latch mechanism at the closed position. Here, the base body 2 is bordered by the flange portion 26 on the upper side, the side wall 23 projects outward from the rear side 23a compared to the front side 23b, and a window portion that communicates the inside and the outside is formed on the projecting end surface. . The door 3 has a support arm 31 that is arranged from the inside of the base 2 to the outside through the window portion. The rotation mechanism is characterized in that it has an arcuate gear portion 37 provided on the arm 31 of the door 3 and a rotating gear 7 attached to the arc center of the gear portion 37, and the base body 2 has an arcuate rib 27. And a gear-shaped second fixed gear portion 28 which is provided on the inner side of the first fixed gear 27a and meshes with the rotary gear 7. The rotation gear 7 is mounted on the output shaft of the damper means 6. The latch mechanism 4 is a push-push locking mechanism in which an engaging protrusion 34 protruding from the door 3 is assembled on the base 2 side (this mechanism is a push-open mechanism or a push-lock / push-open mechanism). When the door 3 is pushed from the open position to the closed position against the urging force of the urging means 5, the engagement protrusion 34 on the door side is moved. The door 3 is locked and unlocked when the door 3 is further pushed in the closing direction. The biasing means 5 is a coil-shaped spring member. One end 5a is locked to a protrusion 29 provided on the base side, and the other end 5b is locked to a shaft portion 35 provided on the arm side. Yes.

JP 2003-129742 A

  In the door opening and closing device of the above-mentioned document 1, the door 3 is opened and closed along a locus along the first fixed gear portion 27a constituting the rotation mechanism. That is, as the rotation mechanism, when the door 3 is switched from the closed position to the open position and from the open position to the closed position, the rotation fulcrum of the door 3 is moved downward or upward according to the first fixed gear portion 27a having the internal shape. Thus, the amount of protrusion of the door 3 from the inside of the base body 2 is suppressed at the open position, and a favorable operation resulting from the meshing of the gears with the braking of the damper means 6 can be obtained. However, in the above rotation mechanism, the arcuate gear portion 37 is meshed with the first fixed gear portion 27a concentric with the second fixed gear 28, so that the degree of freedom in determining the opening / closing locus of the door is lacking, and between the gears If the accuracy between the gears is difficult and the accuracy between the gears is not achieved, reliable operation cannot be obtained. On the other hand, as the latch mechanism 4, when the door 3 receives an external force or is thermally deformed, it immediately affects the engaging protrusion 34 attached to the door 3. For example, the latching state of the engaging protrusion 34 is changed. There was a risk of inadvertent release or malfunction. Further, because the door 3 is engaged and disengaged through the engaging protrusion 34 projecting from the inner surface, the engaging protrusion 34 protrudes upward in the base at the door open position, and the appearance is damaged. It gets in the way when the goods are put in and out.

  The object of the present invention is to solve the above-described problems and particularly to improve the usability by simplifying the structure of the rotating mechanism and improving the switching operation characteristics. In particular, the latch mechanism is intended to improve the appearance characteristics and prevent malfunction due to deformation of the door.

In order to achieve the above object, the invention according to claim 1 is a door opening / closing device in which a door is switched between a closed position and an open position via a rotation mechanism with respect to the base , and the base is slidably assembled. And a slider that is operatively connected to the door and a biasing means that biases the slider in one direction, and the pivot mechanism includes the door provided on the support arm and the arm. And a rack that meshes with the arcuate gear portion that is provided substantially parallel to each other at a predetermined interval. And a guide part that guides the movement of the sliding part, the door is opened and closed by sliding of the slider, and can be switched between an open position and a closed position along the rack part and the guide part. It is characterized by.

The above door opening and closing device is more preferably embodied as follows.
A structure in which the guide portion on the base side is formed as a second rack portion and the sliding portion on the door side is a gear meshing with the second rack portion (Claim 2);
Configuration - the door is switched to the closed position from the open position against the biasing force of the biasing means (claim 3),
A structure in which the door is swingably coupled to the slider via a link and has a spring member interposed between the link (Claim 4);
A rotary damper unit attached to the slider is provided, and a rotary gear mounted on an output shaft of the damper unit is meshed with rack teeth provided on the base body (Claim 5).

In order to achieve the above object, the inventions of claims 6 and 7 are specified from the rotating mechanism and the latch mechanism. That is, the invention according to claim 6 is a door opening / closing device in which the door is switched between a closed position and an open position with respect to the base body via a rotation mechanism and releasably locked via a latch mechanism at the closed position. any Tona Rutotomoni of claims 3 5, wherein the latch mechanism comprises a detachment mechanism provided corresponding to said slider and said base, and a release knob provided on the door, When the door is switched from the open position to the closed position against the urging force, the door is locked through the engagement / disengagement mechanism and is unlocked by operating the knob. On the other hand, according to the invention of claim 7, the door is switched between a closed position and an open position with respect to the base body via a rotation mechanism, and is locked in a releasable manner via a latch mechanism at the closed position. in the device, either Tona Rutotomoni of claims 3 5, wherein the latch mechanism is provided in correspondence with the slider and the base, switching from the open position against the urging force of the door to a closed position direction It is a push-push locking mechanism that locks when released, and further releases the lock when the door is pushed in the same direction and released.

In the first aspect of the invention, for example, compared to the conventional mechanism of Document 1, the rack portion (first rack portion) and the guide portion are kept at a predetermined interval, which is simplified and designed to determine the opening / closing locus of the door. The degree of freedom can be expanded. In addition, since the door is opened and closed by sliding the slider with respect to the base, the opening and closing operation can be maintained better via the slider, or the door can be opened and closed while approaching the corresponding surface on the base. As in the embodiment, it is easy to set so that the biasing force of the biasing means is applied to the door side equally.
In the invention of claim 2, the door meshes with the arcuate gear portion on the support arm side with respect to the rack portion on the base side (first rack portion), and meshes with the gear on the support arm side with respect to the second rack portion. A better and more stable switching operation is realized in the situation.
In the invention of claim 3, the door is switched from the open position to the closed position against the biasing force of the biasing means.
In the invention of claim 4, since the door is connected to the slider via the link, the link is made so that unnecessary stress does not occur between the door (rotation and movement) and the slider (linear movement) having different movements. In addition, the spring member interposed between the door and the link absorbs rattling at the open and closed positions of the door, for example, the door moves the slider (the movement by the biasing force of the biasing means). ), The spring member is spring-charged when it is switched from the closed direction to the open direction, thereby facilitating the uniform movement of the door.
In the invention of claim 5, when braking the opening or closing speed of the door with the rotary damper means, the damper means is attached to a slider that moves linearly so that an unexpected external force is not applied to the damper means. Thus, damage to the damper means is prevented.

In the inventions of claims 6 and 7, by providing the engagement / disengagement mechanism and the push / push locking mechanism between the slider and the base instead of between the door and the base, for example, an external force or heat applied to the door The possibility of inadvertently releasing the lock due to deformation or the like can be solved. Further, in the case of the sixth aspect, the door is locked through the engagement / disengagement mechanism portion so that the door is unlocked by operating the release knob. However, it is possible to reliably eliminate the possibility of malfunction. In the case of claim 7, the advantage of the push-push locking mechanism, that is, the locking and unlocking can be performed by pushing the door together, so that the operability is excellent, and the release knob is not required and the appearance characteristics are maintained. it can.

  The best mode of the present invention will be described with reference to the drawings. 1 to 9 show a box structure to which a door opening / closing device is applied, and FIG. 10 shows another example of a latch mechanism. In the following description, the outline, structure, operation, and modification will be described in detail in this order.

(Outline) In the box 1 of the embodiment, the box-shaped base 2 has an opening on one side surface, and the opening is opened and closed by a door 3 to which the door opening and closing device of the present invention is applied. The base 2 only needs to have an opening that is opened and closed by the door 3 or an operation surface corresponding to the opening (referred to here as an opening for convenience, including such an aspect), depending on the application product. Designed. Therefore, the door 3 is not limited to a door disposed in a substantially vertical direction in the closed position, and in a substantially horizontal direction in the open position. The aspect arrange | positioned at a perpendicular direction may be sufficient. The door opening / closing device has a slider 4, a conston spring 5 as a biasing means, a damper means 6 for braking, and the like related to the rotation mechanism, and a release knob 7 related to the latch mechanism. have.

(Structure) As shown in FIG. 5, the substrate 2 has a container shape in which the inside is partitioned by the upper and lower surfaces 20, 21, both side surfaces 22 and the back surface 23 and the front side is opened. On the upper surface 20, there are mounting piece portions 20a projecting on both front sides, a disposition plate 24 extending in the front-rear direction at the middle of the left and right, and a locking wall portion 29 extending in the front-rear direction on the front side of the disposition plate 24 (see FIG. 9) and the like. Among these, the arrangement | positioning board 24 comprises substantially rectangular shape, the tooth-shaped rack tooth | gear 25 provided along one side among both sides, the guide wall part 26 provided along the other side, And a support portion 27 protruding in a pair with a gap in the middle of the rear side. The locking wall portion 29 is a portion that locks a later-described striker 8 that constitutes a main portion of the latch mechanism, the front one side is formed on the tapered guide surface 29a, and the front end is set to the locking surface 29b. Has been. The locking wall portion 29 may be formed on the arrangement plate 24 side. The lower surface 21 is provided with mounting piece portions 21a protruding on both rear sides.

  Both side surfaces 22 have a lower side 22a projecting outward from an upper side 22b, and a substantially rectangular frame member 10 is attached to the upper side from the stepped portion by means such as a screw. The frame member 10 is supported by a large number of vertical ribs 22c, is disposed in an inclined state with the rear side being higher than the front, and has a tooth shape provided to face the inner surfaces of the lower frame piece and the upper frame piece, respectively. The first rack portion 11 and the second rack portion 12, and a guide groove 13 (see FIG. 1) located below the second rack portion 12 and provided along the second rack portion 12. Have.

  The slider 4 is slidably incorporated in the arrangement portion 24, and the conston spring 5 is held by both support portions 27. That is, the slider 4 is omitted or simplified for the sake of drawing, but both sides have a substantially U shape in which the corresponding side edge of the arrangement portion 24 is slidably sandwiched, and the intermediate portion 40 has a one-step higher concave shape. Is formed. A rotary damper means 6 is attached to a portion 41 between the intermediate portion 40 and one side. The damper means 6 is composed of an oil damper or the like, and has a rotating shaft receiving resistance such as hydraulic oil, and a gear mounted on the distal end side of the rotating shaft. It meshes with a part. For this reason, the damper means 6 brakes the sliding speed of the slider 4 and can absorb inadvertent rattling of the slider 4 with respect to the arrangement portion 24.

  The Conston spring 5 is held by the support portions 27 of the main body, and passes through the reverse end of the intermediate portion 40 of the slider 4 through the pull-out end side of the leaf spring 5a drawn from the main body to the front portion of the intermediate portion 40. The slider 4 is always urged rearward by the urging force in a state of being locked to the provided latching portion 40a (see FIG. 8). On the other hand, the extension part 43 which protruded ahead is provided in the part 42 between an intermediate part and the other side. As inferred from FIG. 9, the extension portion 43 has a hollow portion 43 a that opens on one side, and the biasing portion (not shown) that biases the striker 8 and the striker 8 toward the hollow portion 43 a. Means are arranged. The striker 8 includes a support portion 8a disposed in the hollow portion 43a, a small block-shaped engagement portion 8b provided at a protruding end of the support portion 8a, and a contact portion provided below the front end of the engagement portion 8b. 8c. The lower end surface of the contact part 8c is formed in a taper shape. The striker 8 abuts on the guide surface 29a while the slider 4 is moved forward against the biasing force of the conston spring 5, and enters the cavity against the biasing force by the reaction force received from the guide surface 29a. If it passes through the guide surface while being retracted, it protrudes again by the urging force as shown in FIG. 9A and is locked to the locking surface 29b at the front end. In the locked state, the slider 4 is held at the foremost position (door open position) against the urging force of the conston spring 5.

  The door 3 is formed of an outer plate 30 and an inner plate 31 joined as shown in FIG. 8, and is bent in a generally U shape as viewed from the side, and forms a latch mechanism and a release knob 7 and a spring. A member 18 is incorporated inside. Here, as shown in FIG. 9, the knob 7 has a lever shape that is long in the vertical direction, the lower side is formed wider by one step, the operation part 7 a protruding from the wide outer surface, and the upper side is bent. And a tapered pressing portion 7c formed on the end surface of the bent portion 7b facing upward, and a projection (not shown) for positioning and supporting the spring member 18. The abutting portion 8c and the pressing portion 7c are set in a tapered shape that allows the striker 8 to easily move in the retracting direction when the pressing portion 7c is lifted in contact with the abutting portion 8c. On the other hand, the outer plate 30 is provided with a through hole 30a in the lower intermediate portion for arranging the operation portion 6a so as to be movable up and down from the inside. The inner plate 31 includes a supporting arm 32 facing both sides, a shielding horizontal rib 31a projecting inside the arms 32, and a pair of mounting pieces 35 projecting from the upper intermediate portion. An elongated through hole 36 that is opened to the outside of one piece 35 and is inserted through the bent portion 7b so as to be movable up and down is provided. Reference numeral 31b denotes a relief overhanging portion for disposing the lower portion of the knob 7. Further, the outer plate 30 and the inner plate 31 have ribs (not shown) on the opposing surfaces, and the knob 7 together with the coil-shaped spring member 18 in a space 3a (see FIG. 4) formed by the ribs. It is arranged so that it can move freely.

  The support arm 32 is formed on the outer periphery of the tip and is engaged with the first rack 11, and the support arm 32 is pivotally supported via the stopper 15 or the like at the center of the arc of the gear portion 32 a and is engaged with the second rack portion 12. It has a gear 33 and a projection-like sliding portion 34 that is arranged coaxially with the gear 33 and moves in a state of being fitted in the guide groove 13. And in this form, as a rotation mechanism, the movement in the meshing state of the arcuate gear part 32a with respect to the first rack part 11, the movement in the meshing state of the gear 33 with respect to the second rack part 12, and the guide groove 13 The movement of the sliding portion 34 in the fitted state substantially confirms the opening / closing locus accompanied with the rotation and movement of the door 3, and the door 3 is connected to the slider 4 via the link 9 as described below. The door 3 can be opened and closed in a favorable manner.

  That is, as shown in FIG. 8, the link 9 is provided on the same axis as the front side, and the link 9 swings relative to the door 3 in a state where the two protrusions 9a are fitted in the shaft holes 35a of the corresponding pieces 35 on the door side. The slider 4 is movably connected, and the rear side is slidably connected to the slider 4 in a state where the rear side is hooked on a latching portion 40 a provided on the front side of the slider-side intermediate portion 40. A coil spring 16 is interposed between the link 9 and the door 3. The coil spring 16 is supported by the protrusion 9 a and two supporting portions 9 b protruding from the corresponding end surface, one end is locked to the door side, the other end is locked to the link side, and the door 3 is connected to the slider 4. It is wound up so as to accumulate and increase the urging force as it rotates and moves by backward movement. However, the door 3 may be connected to the slider 4 so as to be swingable directly without using the link 9, and a spring member corresponding to the coil spring 16 may be interposed in the connecting portion.

(Operation) FIGS. 7 and 9A show a state where the door 3 is in a closed position in which the opening of the base 2 is completely closed. In this closed position, as the latch mechanism, the slider 4 is in the foremost position against the urging force of the conston spring 5, and the striker 8 on the slider side is engaged with the engagement surface of the engagement wall portion 29 as shown in FIG. The door 3 is held in a state of being latched to 29b, and the door 3 is held via the link 9 on the slider 4 whose position is restricted. As the rotation mechanism, in the arms 32 on both sides of the door, the arcuate gear portion 32 a meshes with the teeth of the first rack portion 11, the gear 33 meshes with the teeth of the second rack portion 12, and the sliding portion 34 becomes the guide groove 13. It is mated with.

When the door 3 is switched from the closed position to the open position, when the knob 7 is pressed upward via the operation portion 7a, the door 7 is moved upward against the urging force of the spring member 18, and the pressing portion 7c is moved to the striker side. The striker 8 is brought into contact with the lower end surface of the contact portion 8c, and further, the striker 8 is moved back into the hollow portion 43a against the urging force by the sliding action of the taper shape. In this manner, when the striker 8 is retracted, the engaging portion 8b is disengaged from the locking surface 29b of the locking wall 29 described above and is unlocked. FIG. 9B shows a state when the lock is released. The knob 7 is moved to the initial position by the urging force of the spring member 18 when the hand is released from the operation portion 7a . In this released state, the slider 4 is moved backward by the biasing force of the conston spring 5, and the door 3 is driven by the slider 4 via the link 9. In the open position, the overhanging portion of the door 3 protruding from the base 2 due to the movement of the door 3 along the first and second rack portions 11 and 12 and the guide groove 13 is greatly reduced, and appearance characteristics and the like are improved. .

  The door 3 is opened / closed by movement of the arcuate gear portion 32a in mesh with the first rack portion 11, movement of the gear 33 in mesh with the second rack portion 12, and sliding portion with respect to the guide groove 13. By the movement in the fitted state of 34, a locus accompanied with the rotation and movement of the door 3 is obtained. Further, in the switching process, the speed is reduced by the meshing of the teeth and braking by the damper means 6 is received. As the rotation mechanism, for example, the engagement between the second rack portion 12 and the gear 33 is omitted, the engagement between the first rack portion 11 and the arcuate gear portion 32a, and the sliding portion 34 with respect to the guide groove 13. It is also possible to almost confirm the opening / closing locus with the rotation and movement of the door 3 by the movement in the fitted state.

  When the door 3 is to be closed again, the door 3 is pulled forward against the urging force of the conston spring 5. Then, conversely, the arcuate gear portion 32 a meshes with the teeth of the first rack portion 11, while the gear 33 meshes with the teeth of the second rack portion 12, and the sliding portion 34 enters the guide groove 13. Rotate and move downward while being guided. Then, the striker 8 abuts against the guide surface 29a while the slider 4 is moved forward against the biasing force of the conston spring 5, and enters the cavity against the biasing force by the reaction force received from the guide surface 29a. If it passes through the guide surface while being retracted, it protrudes again by the urging force as shown in FIG. 9A and is locked to the locking surface 29b at the front end. In the locked state, the slider 4 is held at the foremost position against the urging force of the conston spring 5, and the door 3 is held at the open position via the link 9 by the slider 4.

  In the above structure, since the movement of the door 3 is a rotation and a movement movement, the link 9 that absorbs the movement of each other is interposed between the slider 4 that moves linearly, When the door 3 is driven by the biasing force of the conston spring 5 via the slider 4, the opening speed of the door 3 is likely to change due to the movement of the center of gravity of the door 3 (in this example, the acceleration is more likely as the door is opened). Therefore, the opening speed of the door 3 is decelerated by the biasing action of the coil spring 16 in proportion to the opening amount of the door 3 (movement amount of the slider 4), each of the conston spring 5 and the coil spring 16 The urging force is received by the left and right intermediate portions of the door 3 so that a uniform driving force can be transmitted to the gears 32a of the arms 32 provided on both sides of the door 3 as much as possible. Sly to - 4 external force unexpected damper means be provided to have been devised in such a point that was not applied as much as possible.

(Modification) The latch mechanism of FIG. 10 locks the door 3 when the door 3 is switched from the open position to the closed position against the urging force of the conston spring 5 via the link 9 and the slider 4. This is an example when a push-push locking mechanism is employed that releases the lock when the hand is pushed in the same direction and the hand is released. That is, in this modified example, the latch device 50 described in Japanese Patent Application Laid-Open No. 2004-137725, Japanese Patent Application No. 2004-201050, or the like is mounted on the mounting frame portion 24a provided in the base side arrangement portion 24 as a push-push locking mechanism. The striker 45 projecting from the rear end surface of the portion 42 of the slider 4 is engaged with and disengaged from the latch device 50. Of course, in this case, the knob 7, the striker 8, the locking wall portion 29, the door side knob arrangement portion, and the like are omitted. The latch device 50 includes a housing 51 that is open at one end, an abutting portion 52 that contacts the striker 45, and a cam groove 53. The latch device 50 is disposed in the housing 51 and is moved against the urging force of the spring member 55. A sliding member 54, a tracing pin member 56, a shock absorbing responding member 57, a claw 58a on the distal end side, and a pin 58b on the proximal end side, and is rotatably supported by the sliding member 54. A claw 58 is provided. Among these, the engaging claw 58 is pivotally supported in a state where the shaft portion is fitted to the corresponding portion of the sliding body 54, and is brought into an unlocking position almost retracted into the sliding body by the movement of the sliding body 54. As shown in the figure, the claw 58a protrudes from the sliding body and is switched to the locking position for pressing the striker 45. In the unlocking position, the sliding body 54 is moved to the inlet side of the housing 51 by the urging force of the spring member 55, and the engaging claw 58 rides on the rib 58 (not shown) provided in the housing. Keep that state. In the locking position, the sliding body 54 is moved to the inside of the housing against the biasing force of the spring member 55 by the pushing force of the striker 45, and is maintained through the engagement of the cam groove 53 and the pin member 56 at the position after the movement. At the same time, the engaging claw 58 moves the pin 58b to the lower portion from the rib protruding portion and tilts to project the claw 58a from the sliding body. That is, in the above locking mechanism, the engaging claw 58 is moved from the unlocked position to the locked position by the pushing force of the striker 45 against the sliding body 54 (the slider 4 is moved via the link 9 by the pushing operation of the door 3). Since the lock is released by the next pressing force of the striker 45 against the sliding body 54, the usability is excellent.

  The present invention only has to include the technical elements specified in claim 1, and the details can be variously changed as necessary.

It is an external view which shows the box to which the door opening / closing apparatus of the form example is applied in the open position of the door. It is the front view which looked at the box of FIG. 1 from the front side. It is the top view which looked at the box of FIG. 1 from the top. (A) is a side view of the said box, (b) is the sectional view on the AA line of FIG. It is an external view which shows the said box in the closed position of a door. It is the top view which looked at the box of FIG. 5 from the top. (A) is the side view of the box of FIG. 6, (b) is the BB sectional drawing of FIG. It is a block diagram which fractures | ruptures and shows a part of said door, a slider, etc. FIG. It is a figure which shows typically the latch mechanism of the said door opening / closing apparatus. It is a figure which shows the other example of the said latch mechanism. It is explanatory drawing which shows the door opening / closing apparatus of patent document 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Box 2 ... Base | substrate (24 is an arrangement | positioning part, 25 is a rack tooth)
3 ... Door (32 is an arm, 32a is an arcuate gear part, 33 is a gear, 34 is a sliding part)
4 ... Slider (40 is an intermediate part, 41 and 42 are parts, 43 is a hollow part)
5 ... Conston spring (biasing means)
6 ... damper means 8 ... striker (corresponding to engagement / disengagement mechanism portion, 8b is an engagement portion, 8c is a contact portion)
DESCRIPTION OF SYMBOLS 11 ... 1st rack part 12 ... 2nd rack part 13 ... Guide groove (guide part)
16 ... Coil spring (spring member)
29... Locking wall (corresponding to an engaging / disengaging mechanism, 29b is a locking surface)
45 ... Striker 50 ... Latch device (push / push locking mechanism)

Claims (7)

In the door opening and closing device in which the door is switched to a closed position and an open position via a rotation mechanism with respect to the base body,
The base has a slider that is slidably assembled and operatively connected to the door, and a biasing means that biases the slider in one direction,
The rotation mechanism includes a support arm, an arcuate gear portion provided on the arm, and a sliding portion provided at a substantially arcuate center of the gear portion, and the base is provided at a predetermined interval. And a guide portion that guides the movement of the sliding portion and the rack portion that meshes with the arcuate gear portion provided substantially parallel to each other,
The door is opened and closed by sliding of the slider, and is switched between an open position and a closed position along the rack part and the guide part.   2. The door opening and closing device according to claim 1, wherein the base side guide portion is formed as a second rack portion, and the door side sliding portion is a gear meshing with the second rack portion. Door opening and closing apparatus according to claim 1 is switched to the closed position from the open position against the urging force of the door before Symbol biasing means.   The door opening and closing device according to claim 3, wherein the door is swingably connected to the slider via a link and has a spring member interposed between the door and the link.   5. A rotary damper unit attached to the slider, and a rotating gear mounted on an output shaft of the damper unit meshes with rack teeth provided on the base. Door opening and closing device. In the door opening and closing device in which the door is switched to a closed position and an open position with respect to the base body via a rotation mechanism, and is releasably locked via a latch mechanism at the closed position.
Any Tona Rutotomoni of claims 3 5, wherein the latch mechanism comprises a detachment mechanism provided corresponding to said slider and said base, and a release knob provided on the door, the A door opening and closing device, wherein when the door is switched from an open position to a closed position against an urging force, the door is locked through the engagement / disengagement mechanism and unlocked by operating the knob. In the door opening and closing device in which the door is switched to a closed position and an open position with respect to the base body via a rotation mechanism, and is releasably locked via a latch mechanism at the closed position.
Any Tona Rutotomoni of claims 3 5, wherein the latch mechanism is provided in correspondence with the slider and the base, when switched to a closed position direction from the open position against the urging force of the door A door opening and closing device that is a push-push locking mechanism that locks and further releases the lock when the door is pushed in the same direction and released.

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