JP2008106537A - Locking structure of upper portion of sliding door - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently secure safety in addition to an improvement in hanging workability by simply performing sliding-door hanging work and surely preventing the sliding door from coming off an upper rail and falling. <P>SOLUTION: This locking structure is equipped with a locking member 4 with the following functions. In a state in which a pair of right and left operating portions 6c are each protruded from an end surface 5d of a sliding member 5, a pivot large-diameter portion 2a of an upper pivot 2 can be housed in the large-diameter portion storage recess 5c of the sliding member 5 through a pivot inserting hole 6a of a lock plate 6, and concurrently with that, a pivot shaft portion 2b is put into the state of being arranged in such a manner as to face the pivot inserting hole 6a. In a state in which the operating portion 6c is pushed in, the displacement of the lock plate 6 with respect to the sliding member 5 makes a locking groove 6b and of the lock plate 6 and the storage recess 5c vertically communicate with each other. Thus, the pivot shaft portion 2b makes an entry into the locking groove 6b, so that the coming-off of the large-diameter portion 2a can be prevented by the pivot inserting hole 6a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lock structure for an upper part of a sliding door for suspending an upper pivot of the sliding door that opens and closes an entrance / exit in an upper rail state in a retaining state.

  Conventionally, there has been disclosed an interlocking sliding door in which the upper part of the sliding door is slidably fitted to the upper rail and the lower part of the sliding door is movably supported on the lower rail (see, for example, Patent Document 1).

However, in the conventional example shown in Patent Document 1 above, the upper part of the sliding door is merely slidably inserted into the upper rail. For example, due to vibration caused by an earthquake or a load caused by leaning on a person, etc. When an external force is applied in the direction in which the upper pivot is pulled out from the upper rail, there is a possibility that the upper portion of the sliding door may come off from the upper rail. Therefore, it is necessary to reliably prevent the sliding door from falling over.
Japanese Patent Laid-Open No. 2003-13668

  The present invention has been invented in view of the above-described conventional problems, and can easily perform the sliding door hanging work and can reliably prevent the sliding door from falling off the upper rail and falling down. It is an object of the present invention to provide a lock structure for an upper part of a sliding door that can sufficiently ensure safety in addition to improvement of workability.

  In order to solve the above-mentioned problems, the present invention provides a sliding door upper lock structure for hanging an upper pivot 2 of a sliding door 1 that opens and closes an entrance to an upper rail 3 in a state of being prevented from coming off. A pivot-shaped large-diameter portion 2a protrudes from the upper end of the pivot shaft portion 2b, and the upper rail 3 is provided with a lock member 4 for preventing the upper pivot 2 from coming off. 4 is a slide member 5 that is slidably fitted along the upper rail 3 in a direction parallel to the opening / closing direction A of the sliding door 1, and is supported to be displaceable in a direction parallel to the opening / closing direction A of the sliding door 1 with respect to the sliding member 5. The slide member 5 is provided with a large-diameter portion storage recess 5c that opens downward and can store the pivot large-diameter portion 2a. Before penetrating into A pivot insertion hole 6a through which the pivot large-diameter portion 2a can be inserted, and a pair of left and right locking grooves which are coupled to both sides of the pivot insertion hole 6a and are thinner than the pivot large-diameter portion 2a and into which the pivot shaft portion 2b can be inserted. 6b and a pair of left and right operation portions 6c protruding from the both end surfaces 5d of the slide member 5 so as to advance and retreat in the opening / closing direction A of the sliding door 1 are provided, and the operation portion 6c protrudes from the end surface 5d of the slide member 5. In this state, the pivot insertion hole 6a and the large-diameter storage recess 5c communicate vertically so that the pivot large-diameter portion 2a can be stored in the large-diameter storage recess 5c through the pivot insertion hole 6a and at the same time the pivot shaft The portion 2b is arranged facing the pivot insertion hole 6a, and the locking groove 6b and the large-diameter portion storage recess 5c communicate vertically when the operation portion 6c is pushed. Bot shaft portion 2b is characterized by a pivot insertion hole 6a and enters the locking groove 6b from the pivot large diameter portion 2a is configured to be retained at the pivot insertion hole 6a.

  By adopting such a configuration, the lock member 4 functions and the upper pivot 2 of the sliding door automatically moves with respect to the lock member 4 simply by pressing one of the left and right operation portions 6c. The sliding door 1 is prevented from coming off and can be reliably prevented from falling off the upper rail 33 due to vibration caused by an earthquake or a load caused by a person leaning.

  The lock member 4 slides the lock plate 6 in a state where the pivot shaft portion 2b enters the locking groove 6b from the pivot insertion hole 6a and the pivot large diameter portion 2a is prevented from coming off by the pivot insertion hole 6a. It is preferable to provide a fixing means for fixing the member 5 so that it does not move. In this case, since the displacement of the lock plate 6 with respect to the slide member 5 can be surely prevented by the fixing means, the fixing means can be locked for a long time. High reliability of functions can be secured.

  According to the present invention, the sliding member can be easily suspended by simply moving one of the pair of left and right operation portions into a depressed state so that the lock member functions. In addition, even if an external force is applied in the direction in which the upper pivot is pulled out of the upper rail due to an earthquake or a load caused by a person leaning on the upper pivot, the upper pivot is removed from the upper rail via the lock member. Since it is stopped, it is possible to prevent the sliding door from coming off from the upper rail and falling down, and as a result, it is possible to sufficiently secure safety in addition to improving the lifting workability.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  1 and 2 are explanatory views of the lock member 4 of the present invention, FIG. 3 is an explanatory view of the lock plate 6, and FIG. 4 is an explanatory view of a connection state between the lock member 4 and the wire 13 of the interlocking means 10. FIG. 5 is an explanatory diagram of a state in which the upper pivot 2 of the sliding door 1 is retained by the lock member 4.

  As shown in FIG. 7, three sliding doors are arranged in a sliding manner at the doorway. The three sliding doors include a first sliding door 1A having an upper pivot 2 that is locked by a locking member 4 mounted on the upper rail 3, a second sliding door 1B disposed on the rear side of the first sliding door 1A, and It consists of 1 C of 3rd sliding doors arrange | positioned at the rear side.

  An upper pivot 2 is attached to the upper end of the first sliding door 1. The upper pivot 2 is made of a pivot with a spring as shown in FIG. 6, for example, and a coil spring 2d is housed inside a cylindrical portion 2c with a hook opened upward and embedded in the sliding door 1, and the upper portion of the cylindrical portion 2c. The lower part of the pivot shaft 2b is inserted from the opening so as to be movable up and down. At the upper end of the pivot shaft 2b, a bowl-shaped pivot large diameter portion 2a that is thicker than the pivot shaft 2b is provided. As will be described later, when the sliding door 1 is lifted with the upper pivot 2 inserted into the upper rail 3 and the lower runner 7 is fitted into the lower rail 8, the coil spring 2d contracts (the state shown in FIG. 6C). The projecting dimension of the upper pivot 2 is shortened so that the lower runner 7 can be smoothly fitted into the lower rail 8. The upper pivots 2A and 2B having the same configuration are also attached to the upper ends of the second sliding door 1B and the third sliding door 1C.

  On the other hand, as shown in FIG. 7, the upper rail 3 includes a first upper rail groove 3a for guiding the upper part of the first sliding door 1A, a second upper rail groove 3b for guiding the upper part of the second sliding door 1B, A third upper rail groove 3c for guiding the upper part of the three sliding doors 1C is provided.

  A lock member 4 is attached to the first upper rail groove 3a. The lock member 4 has both a function as a pivot guide for guiding the upper pivot 2 of the first sliding door 1A and a lock function for preventing the upper pivot 2 from coming off.

  As shown in FIG. 1, the lock member 4 includes a slide member 5 slidably fitted along the upper rail 3 in a direction parallel to the opening / closing direction A of the sliding door 1, and the opening / closing direction A of the sliding door 1 with respect to the sliding member 5. And a lock plate 6 supported so as to be displaceable in a parallel direction.

  As shown in FIG. 2, the slide member 5 is formed with a fitting groove 5e that is slidably fitted into the first upper rail groove 3a. In addition, a large-diameter storage recess 5c that opens downward and has a size capable of storing the pivot large-diameter portion 2a is provided on the center side of the slide member 5. In this example, the slide member 5 is divided into an upper member 5a and a lower member 5b, and the lock plate 6 is sandwiched therebetween. FIG. 10 shows the upper member 5a, and the upper member 5a is formed with a large-diameter storage recess 5c. As shown in FIG. 2, the lower member 5b is formed with a large opening hole 5f that opens downward in a bowl shape, and the pivot large-diameter portion 2a extends from the opening hole 5f to a pivot insertion hole 6a of the lock plate 6 described later. It can be smoothly inserted into the large-diameter storage recess 5c. Further, a pair of screw holes 5g are provided on both sides of the large-diameter storage recess 5c in the upper member 5a, and a pair of screw insertion holes 5h facing the screw holes 5g are formed in the lower member 5b. By screwing the fixing screw 16 into the screw hole 5g of the upper member 5a through the locking groove 6b (or screw insertion hole 6d) of the lock plate 6 described later from the screw insertion hole 5h, the upper member 5a, the lock plate 6 and the lower The side member 5b is assembled integrally.

  At the center of the lock plate 6, as shown in FIG. 3, a round hole-shaped pivot insertion hole 6a that passes through the pivot large diameter portion 2a through the top and bottom is opened. A pair of locking grooves 6b are formed on both sides along the direction parallel to the opening / closing direction A of the sliding door 1 and connected to the pivot insertion hole 6a. Each of the pair of locking grooves 6b is narrower than the pivot large-diameter portion 2a and has a slit shape into which the pivot shaft portion 2b can be inserted. The shaft portion 2b can enter one of the locking grooves 6b from the pivot insertion hole 6a.

  Here, on both sides of the lower surface of the slide member 5, a pair of screw holes 5g are provided at positions facing the pair of locking grooves 6b.

  Furthermore, a pair of operation portions 6c having a certain thickness are provided on both end sides of the lock plate 6 (extension side of the lock groove 6b). Each operation portion 6c can protrude from both end surfaces 5d of the slide member 5 so as to freely advance and retract in the opening / closing direction A of the sliding door 1. In a state where the pair of operation portions 6c protrude from the both end surfaces 5d of the slide member 5 (the state shown in FIG. 1), the pivot insertion hole 6a and the large-diameter portion storage recess 5c communicate with each other vertically. When the operating portion 6c is pushed in until it touches the end surface 5d of the slide member 5 (the state shown in FIGS. 4 and 5), the one locking groove 6b and the large-diameter storage recess 5c communicate vertically. ing. In the example shown in FIGS. 4 and 5, when the pair of operation portions 6 c protrude, the end surface 5 d of the slide member 5 is flush with the side end surface 1 a of the first sliding door 1 </ b> A, and the side end surface 1 a of the first sliding door 1 </ b> A. Thus, when the side end face 1a of the first sliding door 1A hits the door stop 9, one operation part 6c hits the upper surface portion of the door stop 9 and is pushed in. It is.

  Next, the interlocking means 10 will be described. A pair of pivot guides 12 for guiding the upper pivot 2A of the second sliding door 1B is provided in the second upper rail groove 3b of the upper rail 3. As shown in FIG. 9, each pivot guide 12 is formed with a fitting groove 12a that is slidably fitted into the second upper rail groove 3b, and an upper pivot 2A (FIG. 15) of the second sliding door 1B. Are inserted into the pivot insertion hole 12b and a boss 50 screwed to the wire attachment plate 11 is provided.

  As shown in FIG. 8, the wire mounting plate 11 screwed to the pivot guide 12 is formed in a long shape from the door tip side to the door bottom side of the second sliding door 2A, and both ends in the longitudinal direction thereof. An endless wire 13 is wound around a pair of pulleys 14 provided on the side, and a part of the wire 13 is connected to a wire connecting portion 15 provided on the lock member 4. In this example, as shown in FIG. 2, the wire connecting portion 15 protrudes forward from the slide member 5 constituting the lock member 4, and one wire 13 is inserted into a recess 15 a provided at the tip of the wire connecting portion 15. The part is fixed. Here, as a method of fixing a part of the wire 13 and the recess 15a, for example, a method such as hardening with resin, caulking, screwing, or the like can be employed.

  Further, the pivot guide 17 slidably fitted into the third upper rail groove 3c includes a pivot insertion hole 17a into which one of the pair of upper pivots 2B (FIG. 15) of the third sliding door 1C is inserted. And a wire connecting portion (not shown) fixed to a part of the rear portion 13 b of the wire 13 of the wire mounting plate 11. The wire connecting portion and the wire 13 are fixed in the same manner as the wire connecting portion 15 and the wire 13 of the lock member 4 are fixed.

  Next, an example of the construction procedure of the sliding door 1 will be described with reference to FIGS.

  As shown in FIG. 11, the lock member 4 is slide-fitted into the first upper rail groove 3a on the near side of the upper rail 3, and the wire mounting plate 11 is slide-fitted into the second upper rail groove 3b. 3 The pivot guide 17 is slid and fitted into the upper rail groove 3c. The pivot guide 12, the pulley 14, and the wire 13 are assembled to the wire mounting plate 11 in advance at the factory shipment stage. Moreover, it can replace with the example of arrangement | positioning of FIG. 11, and the arrangement | positioning which slide-fits the lock member 4 to the 3rd upper rail groove | channel 3c of the back | inner side of the upper rail 3 is also possible like FIG. Hereinafter, a case where the lock member 4 is arranged in the first upper rail groove 3a on the near side will be described.

  First, the third sliding door 1C is lifted in the direction B of FIG. 13 (a), and the upper pivot 2B on the door tip side of the third sliding door 1C is inserted into the pivot insertion hole 17a of the pivot guide 17 on the back side. In the state where the upper pivot 2B on the side is directly inserted into the third upper rail groove 3c, the third sliding door 1C is lowered in the direction B of FIG. 13 (a) to lower the lower runner 7 into the third lower rail 8 groove of the lower rail 8. Fit (state of FIG. 13B).

  Next, in the same manner as in the case of the third sliding door 1C, with the pair of upper pivots 2A, 2A of the second sliding door 1B inserted into the pair of pivot guides 12 of the wire mounting plate 11 on the center side, Build 1B.

  Thereafter, the upper pivot 2 on the door bottom side of the first sliding door 1A is directly inserted into the first upper rail groove 3a on the front side, and the pivot insertion in which the upper pivot 2 on the door tip side is provided in the lock plate 6 of the lock member 4 is inserted. Insert into hole 6a.

  At this time, the fixing screw 16 which is a fixing means of the lock member 4 is in a temporarily tightened state, and the pair of operation portions 6c of the lock plate 6 are protruded from both end surfaces 5d of the slide member 5 (state shown in FIG. 1). Thus, the pivot large-diameter portion 2a can be stored in the large-diameter storage recess 5c through the pivot insertion hole 6a of the lock plate 6 from the direction of the arrow in FIG. 11 (or FIG. 12), and the pivot shaft portion 2b. Can be arranged facing the pivot insertion hole 6a. In this state, the 1st sliding door 1A is built in the same way as the case of the 3rd sliding door 1C (state of Drawing 15).

  Thereafter, the first sliding door 1A is moved in the direction indicated by the arrow D in FIG. 16 (a), and the side edge surface 1a on the door tip side of the first sliding door 1A is brought into contact with the door stop 9, thereby following the first sliding door 1A. The operation part 6c on the door end protruding from the slide member 5 of the lock member 4 moving in contact with the end of the upper rail 3, here the upper surface portion of the door stop 9, is pushed by the displacement of the lock plate 6 with respect to the slide member 5. State (state of FIGS. 4 and 5). At this time, the pivot shaft portion 2b enters the locking groove 6b from the pivot insertion hole 6a of the lock plate 6 so that the pivot large diameter portion 2a is prevented from coming off by the pivot insertion hole 6a, and the upper pivot 2 is locked. The member 4 can be automatically locked.

  Finally, in a state where the upper pivot 2 is locked by the lock member 4, the lock plate 6 can be fixed against the slide member 5 by moving the fixing screw 16 from below the lock member 4. The displacement of the lock member 4 relative to the slide member 5 can be prevented.

  And if the 3 continuous sliding doors built in this way are moved to the direction which opens 1 A of 1st sliding doors from the fully closed state of Fig.16 (a), the 2nd sliding door 1B will be fixed with respect to the upper rail 3. FIG. Therefore, the second sliding door 1B is opened following the first sliding door 1A. At this time, the wire 13 moves following the first sliding door 1A, and the left and right pulleys 14 around which the wire 13 is wound also move. At this time, the difference in the transition distance between the first sliding door 1A and the second sliding door 1B is based on the relationship between the wire 13 and the pulley 14 that suspends the wire 13 and the transition distance from the closed position to the open position of the first sliding door 1A. The transition distance of the second sliding door 1B is halved, so that the second sliding door 1B is reliably opened and closed following the opening and closing of the first sliding door 1A as shown in FIGS. Can do. At this time, the pivot guide 17 of the third sliding door 1C also shifts due to the transition of the wire 13 and the pulley 14, but the second sliding door 1B also shifts by the same distance, so the relative position of the pivot guide 17 with respect to the third sliding door 1C does not change. Therefore, the third sliding door 1C does not move and can be fully opened. Further, when the first sliding door 1A is closed from the fully open state, the first sliding door 1A can be fully closed by the reverse operation.

  Then, the sliding member 1 is moved to the end portions of the upper and lower rails 3 and 8 and the side end face 1a of the sliding door 1 is merely brought into contact with the door stop 9 so that the lock member 4 functions and the upper pivot 2 of the sliding door 1 is locked. The member 4 is automatically prevented from coming off (the state shown in FIGS. 4 and 5), and the hanging work can be easily performed. In addition, it is not necessary to push the operating portion 6c at a high position with a finger, and the workability is further improved. Moreover, since the displacement of the lock plate 6 relative to the slide member 5 can be reliably prevented by the fixing screw 16 after locking, high reliability of the lock function can be ensured over a long period of time. Moreover, even if an external force is applied in a direction in which the upper pivot 2 is pulled out from the upper rail 3 due to a vibration caused by an earthquake or a load caused by a person leaning on the upper pivot 2, the upper pivot 2 is interposed via the lock member 4. Since it is prevented from coming off from the upper rail, there is no possibility that the sliding door 1 comes off from the upper rail and falls down, and safety is ensured.

  Moreover, since the operation part 6c protrudes right and left, respectively, even if it moves the sliding door 1 to the closing side or the opening side, either one of the operation parts 6c in the protruding state can be always pushed, and the lock member 4 will function reliably, and a locked state can be functioned more reliably.

  In addition, by moving the first sliding door 1A and hitting the door per door 9, it is confirmed whether the sliding door 1 (1 </ b> A to 1 </ b> C) can be opened and closed in conjunction with the operation of the sliding door 1 and the upper pivot 2 of the first sliding door 1 </ b> A. Since the locking operation is performed at the same time, it is not necessary to perform the locking operation separately, and the hanging operation is further increased. In addition, by preventing only the upper pivot 2 of the first sliding door 1A located closest to the locking member 4 from slipping out, the first sliding door 1A can be prevented from falling forward and, in the unlikely event, the second sliding door 1B or the second sliding door Even when the upper pivot 2A or 2B of the 3 sliding door 1C is detached from the upper rail 3, the first sliding door 1A located in front becomes a wall to prevent the second sliding door 1B or the third sliding door 1C from falling down. As a result, the sliding doors 1A to 1C can be efficiently prevented from falling.

  The operation unit 6c may be pushed by a finger, and in this case, it is easy to confirm that the function of the lock member 4 is working.

  Furthermore, since the wire mounting plate 11, the pair of pulleys 14 and the wire 13 can be integrally provided with respect to the pivot guide 12 slidably fitted to the upper rail 3, the interlocking means 10 using the wire 13 as an interlocking element is provided. Assembling to the upper rail 3 becomes easy, and there is an advantage that the number of parts can be reduced and the labor required for assembling can be saved.

  Moreover, in this example, as shown in FIG. 17, the catch member 18 for preventing the rebounding at the time of closing the first sliding door 1A at the end of the first upper rail groove 3a of the upper rail 3 on the door contact 9 side. Is installed. The catch member 18 includes a shaft portion receiver 18a that is fixed to the top surface of the upper rail 3, a shaft portion retainer 18b that is pivotally supported about the longitudinal axis 18k by the shaft portion retainer 18a, and a shaft portion retainer 18b that is pivot shaft portions. And a torsion spring 18c that biases the spring 2b in the direction of pressing. A pivot shaft insertion hole 18d is opened at the end 18g opposite to the door stop 9 side of the shaft receiver 18a, and the tip of the shaft pressing member 18b disposed so as to cover the pivot shaft insertion hole 18d. The portion is formed with mountain-shaped tapered surfaces 18e and 18f for guiding the pivot shaft portion 2b. When the first sliding door 1A is moved to the fully closed position, the pivot shaft portion 2b hits the front tapered surface 18e and the shaft portion presser 18b. So that the pivot shaft portion 2b is pressed by the back-side tapered surface 18f by the spring return of the shaft portion presser 18b so that the first sliding door 1A can be prevented from bouncing back. It has become. Further, when the first sliding door 1A is opened, the pivot shaft portion 2b pushes open the shaft portion presser 18b and comes out of the pivot shaft portion insertion hole 18d, so that the opening operation can be performed smoothly. The catch member 18 is also installed at a position for holding the pivot shaft portion 2b on the door bottom side of the third sliding door 1C, and holds the third sliding door 1C in the fully open position.

  FIG. 18 shows another example of the catch member 18. The difference from FIG. 17 is that the distal end portion of the shaft portion presser 18b protrudes more outward than the end portion 18g opposite to the door stop 9 side of the shaft portion receiver 18a. The pivot shaft portion 2b is sandwiched between a semicircular hole 18i provided in the shaft portion receiver 18a and a semicircular hole 18j provided in the shaft portion retainer 18b.

  In the above embodiment, the case where the protruding operation portion 6c is applied to the upper surface portion of the door stop 9 has been described. Of course, the present invention is not limited to this. When the side end face 1a of the sliding door 1A hits the door stop 9, it is also possible that the operation portion 6c hits the contact portion to be in the pushed state.

It is sectional drawing of the locking member used for one Embodiment of this invention. (A)-(d) is a top view of a locking member same as the above, a front view, a side view, and a top view in the state where a lock plate was displaced. (A)-(d) is a top view of a lock plate same as the above, a front view, a side view, and a bottom view. It is a top view explaining the connection state of the lock member same as the above and the wire of an interlocking means. It is front sectional drawing which shows the state which prevented the upper pivot of the sliding door same as the above in the locking member. (A) is a side view of the upper pivot same as the above, and (b) and (c) are explanatory views when the protruding height of the upper pivot is changed by a spring. It is a side view of the state which suspended the upper part of the 3 continuous sliding door same as the above on the upper rail. (A)-(c) is the front view of the wire attachment plate which comprises the interlocking means same as the above, a bottom view, and a side view. (A)-(d) is a front view of a pivot guide same as the above, a top view, a side view, and a front sectional view. (A)-(f) is a front sectional view of an upper member which constitutes a slide member same as the above, a plane sectional view, a side sectional view, a top view, a front view, and a bottom view. It is a perspective view explaining the state which attached the lock member for 1st sliding doors, the pivot guide with a wire attachment plate for 2nd sliding doors, and the pivot guide for 3rd sliding doors from the near side of an upper rail same as the above. It is a perspective view explaining the state which attached the lock member for 1st sliding doors, the pivot guide with a wire attachment plate for 2nd sliding doors, and the pivot guide for 3rd sliding doors from the back | inner side of the upper rail same as the above. (A) (b) is explanatory drawing of the built-in operation | movement of a sliding door same as the above. It is a perspective view of the built-in state of the triple sliding door same as the above. It is a side view of the built-in state of the triple sliding door same as the above. (A)-(e) is explanatory drawing of the opening operation | movement of the 3 continuous sliding door same as the above. (A) and (b) are the top views and front views explaining a catch member same as the above. (A)-(c) is the top view explaining the modification of a catch member same as the above, a front view, and a bottom view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sliding door 2 Upper pivot 2a Pivot large diameter part 2b Pivot shaft part 3 Upper rail 4 Lock member 5 Slide member 5c Large diameter part accommodation recess 5d End surface of a slide member 6 Lock plate 6a Pivot insertion hole 6b Lock groove 6c Operation part A Opening and closing direction

Claims (2)

  A sliding door lock structure for hanging the upper pivot of the sliding door that opens and closes the entrance door to the upper rail in a retaining state, wherein the upper pivot of the sliding door has a bowl-shaped pivot large diameter portion at the upper end of the pivot shaft portion. The upper rail is provided with a locking member for preventing the upper pivot from coming off, and the locking member slides in a direction parallel to the sliding door opening / closing direction along the upper rail. And a lock plate supported so as to be displaceable in a direction parallel to the sliding door opening / closing direction with respect to the slide member, and the slide member opens downward and accommodates the pivot large-diameter portion. A large-diameter portion is provided, and the lock plate has a pivot insertion hole through which the pivot large-diameter portion can be inserted so as to penetrate vertically, and is coupled to both sides of the pivot insertion hole. A pair of left and right locking grooves that are thinner than the large-diameter part and into which the pivot shaft part can be inserted, and a pair of left and right operation parts that protrude from the both end faces of the slide member toward the opening and closing direction of the sliding door are provided. When the operating portion protrudes from the end face of the slide member, the pivot insertion hole and the large diameter portion storage recess communicate with each other vertically so that the pivot large diameter portion can be stored in the pivot large diameter portion through the pivot insertion hole. At the same time, the pivot shaft portion is disposed facing the pivot insertion hole, and when the operation portion is pushed in, the pivot groove portion is pivotally inserted by vertically communicating with the locking groove and the large-diameter storage recess. A lock structure for an upper part of a sliding door, characterized in that the large diameter portion of the pivot enters the lock groove through the hole and is prevented from being removed by the pivot insertion hole.   The lock member is fixed so that the lock plate does not move relative to the slide member when the pivot shaft part enters the locking groove through the pivot insertion hole and the pivot large diameter part is prevented from being removed by the pivot insertion hole. The locking structure for the upper part of the sliding door according to claim 1, further comprising fixing means for performing the operation.

Images