# Patent

## Title
Showcase

## Abstract

There is provided a simply-structured showcase which can lock a door without damaging an appearance. The showcase comprises a door pivotally supported on one side of an opening of a display room constituted in a main body to close the opening to be freely opened, main body side key metal fittings rotatably mounted to a surface of the door side of the main body on the other side of the opening, and door side key metal fittings rotatably mounted to a surface of the main body side on a non-pivotal support side of the door. The key metal fittings comprise through-holes for lock insertion, and are usually positioned in a space between the main body and the door. Portions in which the through-holes are positioned are protruded outward from the space in a rotated state, and the through-holes match each other in the state.

## Background
BACKGROUND OF THE INVENTION
The present invention relates to a showcase which can lock a door for opening/closing a display room.
The door of the showcase in which the display room is surrounded with a transparent wall has conventionally been constituted to be locked. In this case, there have generally been available a showcase which matches a hole formed in metal fittings of a main body side with a hole of a grip of a door and inserts a lock therein to lock the door (e.g., Japanese Patent Application Laid-Open No. 9-173186), and a showcase which extends a shaft incorporated in a door into a lower machine chamber and locks the door therein (e.g., Japanese Patent Application Laid-Open No. 5-141140).
However, in the case of the former structure, there is a problem of great damage of an appearance because not only realization is difficult but also metal fittings are visible to the outside when the door is not locked unless the door is smaller than the main body. On the other hand, in the latter case, since the locking is carried out in the machine chamber, the problem of the damaged appearance can be solved. However, a door structure becomes considerably complex to cause an increase in cost. Besides, the locking is carried out at a door lower end, bending of the door at the upper portion is increased, creating a problem that the upper portion is separated from the main body to take out goods.
SUMMARY OF THE INVENTION
The present invention has been made to solve the aforementioned conventional technical problems, and it is an object of the invention to provide a simply structured showcase which can lock a door without damaging an appearance.
A first aspect of the present invention is directed to a showcase comprising a door pivotally supported on one side of an opening of a display room constituted in a main body so as to openably close the opening; main body side key metal fittings rotatably mounted to a surface of the door side of the main body on the other side of the opening; and door side key metal fittings rotatably mounted to a surface of the main body side on a non-pivotal support side of the door, wherein the key metal fittings comprise through-holes for lock insertion and are usually positioned in a space between the main body and the door, portions in which the through-holes are positioned are protruded outward from the space in a rotated state, and the through-holes match each other in the state.
A second aspect of the present invention is directed to the above showcase, wherein by bending the key metal fittings into stair-form, the through-holes match each other in a state in which the positioning portions of the through-holes of the main body side key metal fittings are in close contact with the door side of the positioning portions of the through-holes of the door side key metal fittings.
A third aspect of the present invention is directed to the above showcase, wherein the key metal fittings are mounted to positions of no mutual overlap thereof in state in which they are positioned in the space.
A fourth aspect of the present invention is directed to the above showcase, wherein the key metal fittings are made of nonmagnetic materials.
A fifth aspect of the present invention is directed to the above showcase, wherein the main body and the door have holding structures capable of holding the state in which the key metal fittings are positioned in the space.
A sixth aspect of the present invention is directed to the above showcase, wherein the key metal fittings are mounted to the main body in the vicinity of a center of a non-pivotal support side of the door, or the door.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded perspective view of a showcase of an embodiment of the present invention (Embodiment 1);
FIG. 2 is a plan view of the showcase of FIG. 1 excluding a ceiling wall;
FIG. 3 is a plan view of the showcase of FIG. 1 excluding the ceiling wall, a net rack and a bottom plate;
FIG. 4 is an expanded view of a rear portion of FIG. 3;
FIG. 5 is an expanded front view of a locking device portion of the showcase of FIG. 1;
FIG. 6 is an upper perspective view of the showcase of FIG. 1 in a locked state;
FIG. 7 is an expanded front view of the locking device portion of the showcase of FIG. 1 in the locked state;
FIG. 8 is similarly expanded perspective view of the locking device portion of the showcase of FIG. 1 in the locked state;
FIG. 9 is a plan view of metal fittings of each key of the locking device of the showcase of FIG. 1;
FIG. 10 is a plan view of a showcase of another embodiment of the invention excluding a ceiling wall, a net rack and a bottom plate (Embodiment 2); and
FIG. 11 is an expanded view of a rear portion of FIG. 10.



DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Next, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. A showcase 1 of the embodiments is installed at a store such as a supermarket or a convenience store to sell plastic-bottled drinks or canned drinks in a cooled (or warmed) state.
Embodiment 1
FIG. 1 is an exploded perspective view of the showcase 1 according to Embodiment 1 of the present invention. FIG. 2 is a plan view of the showcase 1 in a state in which a ceiling wall 11 is removed, and FIG. 3 is a plan view corresponding to FIG. 2 in a state in which the ceiling wall 11, a net rack 2 and a bottom plate 13 are removed. A main body 3 of the showcase 1 of the embodiment comprises an insulated wall 4 made of foamed polyurethane, a bottom frame 6 made of a hard synthetic resin and mounted to an upper surface of the insulated wall 4, front support pillars 7, 7 and rear support pillars 8, 8 erected at four corners of the bottom frame 6, left and right and rear longitudinal transparent walls 9, 9, and 9 made of transparent double glass which are supported by the support pillars 7, 7, and 8, 8, and the ceiling wall 11.
A longitudinal door 12 (front door) as a transparent wall in which transparent double glass 12B is fitted into a surrounding sash 12A is pivotally supported by the right front support pillar 7 to rotate. In the main body 3, a display room 14 is constituted by being surrounded with the transparent walls 9, 9, and 9, the door 12, the ceiling wall 11, the bottom frame 6, and the center bottom plate 13. The door 12 closes a front opening of the display room 4 to be freely opened. A reference numeral 15 is a grip mounted to a center front in an up-and-down direction (longitudinal direction) of a non-pivotal supporting side (left side) of the sash 12A. A reference numeral 16 is a magnet gasket positioned around the front opening of the display chamber 14 and mounted to the main body 3, and bonded to the door 12 to seal it when the door 12 is closed.
A machine chamber 18 around which panels 17 are mounted is constituted below the insulated wall 4. A compressor and a condenser (not shown) are installed to constitute a refrigerant circuit of a cooling device in the machine chamber 18. A cooling chamber 19 whose upper surface is open is constituted in the insulated wall 4 (FIG. 3). A cooler and a blower (not shown) which constitute the refrigerant circuit are installed in the cooling chamber 19. The bottom plate 13 is made of a hard synthetic resin similar to that of the bottom frame 6, and detachably mounted to the bottom frame 6 to close the upper opening of the cooling chamber 19. The bottom plate 13 is detachably mounted to the bottom frame 6 for assembling workability and maintenance. Depending on designing, however, they may be formed integrally. Irrespective of separate/integral formation, the bottom plate 13 constitutes a part of the bottom frame 6.
A cold air outlet 21 is integrally formed from the front to the deep side on the right of the bottom plate 13. A cold air inlet 22 is integrally formed from the front to the deep side on the left. The cold air inlet 22 is communicated with a cold air suction side of the cooler in the cooling chamber 19, and the cold air outlet 21 is communicated with a cold air discharge side. Angles 23 are erected from the four corners of the bottom frame 6 (FIG. 1 shows front corners only). The front support pillars 7, 7 and the rear support pillars 8, 8 are connected to the angles 23 to be erected.
Shelf supports 24, 26 having a plurality of engaging holes formed up and down are integrally formed in the front support pillars 7, 7 and the rear support pillars 8, 8. Rear left and right sides are inserted and engaged with the engaging holes of the shelf supports 26, 26 of the rear support pillars 8, 8, and front left and right sides are fixed by screws to the engaging holes of the shelf supports 24, 24 of the front support pillars 7, 7, whereby a net rack 2 for displaying goods is hung in the display chamber 14. Incidentally, the net rack 2 is disposed at one state or a plurality of stages according to a use form.
The net rack 2 is made of a wire of a steel material, or a hard synthetic resin, and formed roughly into a rectangular shape. Corresponding spaces G1, G2 are constituted above the cold air outlet 21 and the cold air inlet 22 between the right side and the right transparent wall 9 and between the left side and the left transparent wall 9. In this case, a center of the left and right direction of the net rack 2 is displaced to the left (cold air inlet 22 side), and its mounting area is expanded to the left (cold air inlet 22 side), whereby the space G2 corresponding to a portion above the cold air inlet 22 is narrower than the space G1 corresponding to a portion above the cold air outlet 21. Incidentally, the space G1 of FIG. 2 is similar to that in the left/right side of the net rack of the conventional showcase.
In the rear support pillar 8, as shown in FIG. 4, a wiring receiving portion 28 is integrally formed inside the shelf support 26 (right side of the left rear support pillar 8, the left side of the right rear support pillar 8). The wiring receiving portion 28 receives a wiring for supplying power to a fluorescent lamp (illuminator, not shown) mounted to an inner surface upper end of the door 12. A front of the wiring receiving portion 28 is opened up and down, and a fin piece 29 made of a soft synthetic resin is integrally formed to narrow the opening in the rear support pillar 8 by double extrusion molding. When the wiring is received in the wiring receiving portion 28, the fin piece 29 is pushed aside to insert the wiring through the opening. After the insertion, the fin piece 29 returns to narrow the opening. Thus, the wiring is prevented from coming out through the opening.
A soft fin piece 31 is additionally formed integrally in the rear support pillar 8 (similar in the case of the front support pillar 7) to adhere to the transparent wall 9, whereby sealing and holding performance of the transparent wall 9 are secured. A heat insulating material (not shown) is mounted in the ceiling wall 11, and a groove for drawing around the wiring is formed in the heat insulating material. The wiring raised from the machine chamber 18 in the wiring receiving portion 28 of the rear support pillar 8 is passed through the groove to reach the fluorescent lamp of the door 12. In other words, no coupler is disposed between the fluorescent lamp and the wiring. The pivotal supporting side of the door 12 can be reversed left and right (pivotally supported on the right according to the embodiment), and the grooves of the ceiling wall 11 are symmetrically formed left and right to deal with reversal of the door 12.
On the other hand, a locking device 32 is disposed in the showcase 1. The locking device 32 comprises main body side key metal fittings 33 mounted to the vicinity of the center of the up-and-down direction (longitudinal direction) of the left front support pillar 7 which constitutes the main body 3, door side key metal fittings 34 mounted to the inner surface (side opposite the grip 15) in the vicinity of the center of the up-and-down direction (longitudinal direction) of the non-pivotal support side (left in a closed state) of the sash 12A of the door 12, and a lock 36 (FIG. 2, and FIGS. 5 to 9).
Both key metal fittings 33, 34 are made of similarly shaped nonmagnetic plates of stainless steel or the like, and upper ends thereof are mounted to the front support pillar 7 and the sash 12A by screws 37 to rotate. In this case, the door side key metal fittings 34 are positioned above the main body side key metal fittings 33, usually drooped as shown in FIG. 5 (during nonuse), and positioned in a space between the main body 3 and the door 12 without mutual overlap thereof in the drooped state (In FIG. 5, the door side key metal fittings 34 are virtual). Such arrangement eliminates the necessity of expanding the space between the main body 3 and the door 12.
Additionally, as shown in FIG. 9, the main body side key metal fittings 33 are bent to the front into stair-form, and through-holes 33A are formed in tips thereof. The door side key metal fittings 34 are bent to the rear side into stair-form (main body side key metal fittings 33 are reversed and used), and through-holes 34A are similarly formed in tips thereof. When the door 12 is locked as described later, the door side key metal fittings 34 are rotated obliquely downward left while the door 12 is closed, and the main body side key metal fittings 33 are rotated obliquely upward left. The tips thereof are accordingly protruded from the space between the main body 3 and the door 12 outward (left), and the through-holes 33A, 34A match each other outward (left) from the space between the main body 3 and the door 12 (FIGS. 7, 8). At this time, the tips of the main body side key metal fittings 33 come into close contact with the door 12 side (front side) of the tips of the door side key metal fittings 34 (FIG. 9).
A projection 38 is formed in the front of the front support pillar 7, with which the through-hole 33A of the main body side key metal fittings 33 of the drooped state is engaged to be freely disengaged. Additionally, a projection (not shown) is formed in the sash 12A of the door 12, which is engaged with the through-hole 34A of the door side key metal fittings 34 of the drooped state to be freely disengaged. Accordingly, the key metal fittings 33, 34 are maintained in the drooped states against shocks or a centrifugal force during the rotation of the door 12.
According to the foregoing constitution, when the compressor of the machine chamber 18 and the blower of the cooling chamber 19 are run, the cooler exhibits a cooling operation, and cold air heat-exchanged with the cooler is discharged from the right cold air outlet 21 upward by the blower. The cold air discharged from the cold air outlet 21 rises through the space G1 between the net rack 2 and the right transparent wall 9, lowers through the left space G2, and is sucked from the cold air inlet 22 to circulate in the display room 14. Thus, the goods on the net rack 2 hung in the display chamber 14 are cooled to a predetermined temperature.
At this time, because of the expansion of the left side of the net rack 2 as described above, the space G2 is narrower than the space G1. However, since the space G2 is a path through which the cold air after cooling in the display room 14 lowers, the cold air easily lowers by gravity, and cooing performance is not deteriorated.
Next, when the door 12 of the showcase 1 is locked at the time of closing the store, the door 12 is closed as described above, the door side key metal fittings 34 are rotated obliquely downward left, the main body side key metal fittings 33 are rotated obliquely upward left, and the through-holes 33A, 34A are matched with each other as described above. A hook of the lock 36 is inserted through each of the through-holes 33A, 34A in this state to lock the door (FIGS. 6, 7, and 8).
In this case, since the tips of the main body side key metal fittings 33 are brought into close contact with the door 12 side (front side) of the tips of the door side key metal fittings 34, no so-called backlash (movement in the hook of the lock 36) of both key metal fittings 33, 34 occurs in the locked state.
Because of the constitution of the locking device 32, the key metal fittings 33, 34 are protruded to the outside from the space between the main body 3 and the door 12 at the time of locking, and usually stored in the gap between the main body 3 and the door 12. Thus, an appearance is not damaged, and the key metal fittings 33, 34 are not obstacles during normal door opening/closing. Especially, because of the simple structure in which the key metal fittings 33, 34 are mounted to the main body 3 or the door 12 to rotate, no cost increase occurs.
Furthermore, since the key metal fittings 33, 34 are made of nonmagnetic materials, no reduction occurs in a magnetic force of the magnet gasket 16. Especially, since the key metal fittings 33, 34 of the locking device 32 are mounted to the main body 3 in the vicinity of the center of the non-pivotal support side of the door 12 or the door 12, bending of the upper and lower ends of the door 12 in the locked state can be limited to a minimum, whereby safety can be improved more.
Embodiment 2
FIGS. 10, 11 show another embodiment of the showcase 1 of the invention. Components denoted by reference numerals similar to those of FIGS. 1 to 9 are similar to those of the same. In this case, the showcase 1 of the embodiment is constituted in a manner that front and rear surfaces of a display room 14 are opened, and the openings of the front and rear surfaces comprise doors. Main differences from the previous embodiment are shapes of a bottom frame and a rear support pillar, and a door mounted in place of the rear transparent wall. In this case, the bottom frame is denoted by a reference numeral 6A, the rear support pillar by 8A, and the door of the rear surface (rear door) by 41. The bottom frame 6A is formed into a shape capable of erecting rear support pillars 8A, 8A at rear four corners by inserting a core into the same mold as that of the bottom frame 6.
To mount the door 41 in the same size and to secure an aperture of a rear opening of the display room 14, the rear support pillar 8A is moved to the front side (door 12 side) to be mounted, and a shape thereof is different from that of the aforementioned rear support pillar 8. That is, in this case, the rear support pillar 8A exhibits a shape roughly similar to that of the front support pillar 7, and wiring receiving portions 43, 44 are disposed side by side on two places of the front side in addition to a similar shelf support 42. In openings of the wiring receiving portions 43, 44, fin pieces 46, 47 made of soft synthetic resins are integrally formed by double extrusion. In this case, the wiring receiving portions 43, 43; and 44, 44 receive wiring for an electric heater when the display room 14 is heated to be used in addition to the wiring of the aforementioned fluorescent lamp.
The door 41 is similar in structure to the front door 12, and an outer surface thereof excluding a grip 48 comes to the same position as that of the outer surface of the rear transparent wall 9 of the showcase 1 of FIG. 1 (same outer size) because of the movement of the rear support pillars 8A, 8A to the front side. Accordingly, substantially similar sizes are realized between the case of one door in FIG. 1 and the case of two front and rear doors in FIG. 10 to improve handling performance during transportation and storage. It is to be noted that the aforementioned locking device 32 is disposed also in the door 41.
As discussed above in detail, according to the present invention, the showcase comprises the door pivotally supported on one side of the opening of the display room constituted in the main body so as to openably close the opening, the main body side key metal fittings rotatably mounted to the surface of the door side of the main body on the other side of the opening, and the door side key metal fittings rotatably mounted to the surface of the main body side on the non-pivotal support side of the door. The key metal fittings comprise the through-holes for lock insertion, and are usually positioned in the space between the main body and the door, portions in which the through-holes are positioned are protruded outward from the space in the rotated state, and the through-holes match each other in the state. Thus, the lock can be inserted into the through-holes in the matched state thereof to lock the door.
In other words, since the key metal fitting are protruded outside from the space between the main body and the door only during locking, and usually stored in the gap between the main body and the door, an appearance is not damaged, and the key metal fittings are not obstacles during normal door opening/closing. Especially, because of the simple structure in which the key metal fittings are mounted to the main body or the door to rotate, no cost increase occurs.
According to the invention, in addition to the above, by bending the key metal fittings into stair-form, the through-holes match each other in a state in which the positioning portions of the through-holes of the main body side key metal fittings are in close contact with the door side of the positioning portions of the through-holes of the door side key metal fittings. Thus, no so-called backlash occurs in both metal fittings in the locked state, and safety is improved.
According to the invention, the key metal fittings are mounted to positions of no mutual overlap thereof in a state of being positioned in the space. Thus, the key metal fittings can be mounted without expanding the space between the main body and the door, and space efficiency can be increased.
According to the invention, the key metal fittings are made of nonmagnetic materials. Thus, no reduction occurs in the magnetic force of the magnet gasket or the like used for sealing the door.
According to the invention, the main body and the door have holding structures capable of holding the state in which the key metal fittings are positioned in the space. Thus, it is possible to prevent a problem that the key metal fittings are improperly rotated by a centrifugal force, vibration or the like during the door opening/closing.
Furthermore, according to the invention, the key metal fittings are mounted to the main body in the vicinity of the non-pivotal support side of the door, or the door. Thus, bending of the door end can be limited to a minimum, and safety can be improved more.

## Claims

1. A showcase comprising:
a door pivotally supported on one side of an opening of a display room constituted in a main body so as to operably close the opening;
main body side key metal fittings rotatably mounted to a surface of the door side of the main body on a support pillar on the other side of the opening; and
door side key metal fittings rotatably mounted to a surface of the main body side on a non-pivotal support side of a sash of the door,
whereby both of the key metal fittings comprise through-holes for lock insertion and are completely positioned for storage in a space between the support pillar of the main body and the sash of the door, and both are rotated and protrude outside the space only during locking, the key metal fittings mounted to positions of no mutual overlap thereof, relative to the support pillar and the sash, in a state in which they are positioned in the space for storage, and portions of both in which the through-holes are positioned are protruded outward from the space in a rotated state, and an axis of the through-holes are in alignment to enable lock insertion in the rotated state.

2. The showcase according to claim 1, wherein by bending the key metal fittings into stair-form, the through-holes match each other in a state in which the positioning portions of the through-holes of the main body side key metal fittings are in close contact with the door side of the positioning portions of the through-holes of the door side key metal fittings.

3. The showcase according to claim 1 or 2, wherein the key metal fittings are made of nonmagnetic materials.

4. The showcase according to claim 1 or 2, wherein the main body and the door have holding structures capable of holding the state in which the key metal fittings are positioned in the space.

5. The showcase according to claim 1 or 2, wherein the key metal fittings are mounted to the main body in the vicinity of a center of the mon-pivotal support side of the door, or the door.