JP5702187B2 - Screen door cart - Google Patents

Description

  The present invention relates to a door door for a screen door that is attached to a screen door that can be freely opened and closed along a rail of a sash.

  Insect doors are usually installed at entrances and windows of houses. The screen door is movable along a rail formed in the sash, and a door pulley is attached to the lower arm of the screen door for the movement.

  For example, as disclosed in Patent Documents 1-6, the door for the screen door is attached to the door frame so that the position of the wheel can be adjusted in the vertical direction, and is biased downward by a spring. Is configured to be locked at the position of the rising end. And, by locking the wheel at the position of the rising end, the work of attaching and removing the screen door to and from the sash can be performed easily and reliably, and the vertical width of the screen door and the vertical width of the sash Even if there is a slight error, the screen door can be securely attached to the sash by adjusting the position of the wheel, and even if the screen door is lifted by the action of external force during use of the screen door, the wheel The wheel is pushed down by a spring to prevent the wheel or screen from coming off the rail.

  However, since all the conventional doors disclosed in Patent Documents 1-6 are formed by combining many parts having complicated shapes, the structure is very complicated and the number of parts is large. There was a drawback that it was time consuming and expensive, and it was not easy to use.

Japanese Utility Model Publication No. 5-19478 Japanese Patent Laid-Open No. 5-1113086 JP 2004-92311 A JP 2006-322192 A JP 2006-322193 A JP 2006-342591 A

  Therefore, the object of the present invention is to simplify a door door for doors with a lock function that locks the wheel to the position of the rising end as in the past and a door door for a door that has a drop-off prevention function that prevents the door from falling off due to floating. It is to improve the usability with a simple structure.

In order to solve the above-mentioned problems, a door door for a screen door according to the present invention includes a mounting frame for fixing the screen door to a lower arm of the screen door, a wheel support frame that is telescopically assembled to the mounting frame, and a wheel support frame that is rotatable. A supported wheel, a coil spring interposed between the mounting frame and the wheel support frame and urging the wheel support frame in the extending direction; and screwed to the mounting frame; An adjustment screw for positioning the shortened position of the wheel support frame and adjusting the position of the shortened position; and a lock lever for locking the wheel support frame at a shortened position contacting the adjustment screw, An operation element arranged to be movable to a position where it can be seen from the outside of the mounting frame, and the wheel support frame that moves together with the operation element And a engagement disengaging the locking member, said locking member and moves the operation element in one direction in a state of moving is engaged with the wheel supporting frame the wheel supporting frame in the contracted position the lock the wheel supporting frame in the contracted position, operates as the locking member and moves the operation element in the opposite direction unlocks out from the wheel supporting frame, said adjustment screw, the locking lever It also serves as a lever locking member for locking the at a locking position.

  In the present invention, the operating element of the lock lever has a long screw fitting groove that is fitted into the adjustment screw, and the groove width of the screw fitting groove is larger than the outer diameter of the head of the adjustment screw. An adjustment screw is fitted into the wide portion when the operating element is moved to the unlocking position, and includes a large wide portion and a narrow width portion whose groove width is smaller than the outer diameter of the head. The wheel support frame can be adjusted and positioned by advancing / retracting operation. When the operating element is moved to the lock position, an adjusting screw is fitted into the narrow portion, and the head of the adjusting screw is located on the upper surface of the operating element. It is desirable that the operation element is held in the locked position by being engaged with the actuator.

  Preferably, in the present invention, the wheel support frame is accommodated in the mounting frame so as to be movable up and down, and the coil spring is disposed between the lower surface of the upper wall of the mounting frame and the upper surface of the upper wall of the wheel support frame. Further, the adjusting screw is further provided as a spring guide that penetrates the upper wall of the mounting frame and fits into the coil spring to guide expansion and contraction of the coil spring.

  Furthermore, in the present invention, the locking body of the lock lever extends downward from the operation element toward the wheel support frame, and a locking projection formed on the wheel support frame is fitted and locked on the side surface. It is desirable to have a locking groove.

  The door door for door according to the present invention has the function of a lever locking member for locking the lock lever at the lock position in addition to the function of positioning and position adjustment of the wheel support frame on the adjustment screw. The number of parts is small and the configuration is simple as compared with the case where the members having are provided individually. In addition, since the operation element of the lock lever is arranged so that it can be moved to a position where it can be seen from the outside on the mounting frame, the operation element can be moved to the lock position or unlocked when the screen door is attached or removed. The operation to move to a position can be performed easily and reliably, and it can be accurately confirmed at a glance whether the operation element is in the locked position or the unlocked position without causing misidentification. Easy to use.

It is the front view which looked at the screen door with which the door door for screen doors concerning this invention was attached from the indoor side before building in a sash. It is a longitudinal cross-sectional view of the sash which attached the said screen door. FIG. 3 is a cross-sectional view of FIG. 2. It is the perspective view which looked at the doorwheel from the front side, and shows the state which moved the lock lever to the lock release position. It is the perspective view which looked at the doorwheel of FIG. 4 from the rear surface side. It is the perspective view which looked at the doorwheel from the front side, and shows the state which moved the lock lever to the lock position. It is the perspective view which looked at the door pulley of FIG. 6 from the rear surface side. It is a perspective view which decomposes | disassembles and shows a doorwheel in the direction of FIG. (A) is a principal part side view which shows the lower end part and rail of a screen door just before building in a sash, (b) is a front view at the time of seeing the door wheel and rail of (a) from the indoor side, (c) FIG. 4B is a rear view of the door wheel and rail of FIG. (A) is a side view of the main part showing the lower end portion of the screen door and the rail that are in use by building the screen door in the sash and moving the lock lever to the unlocked position, and (b) is a side view of (a). The front view which looked at the door wheel and the rail from the indoor side, (c) is the rear view which looked at the door wheel and the rail of (b) from the outdoor side. (A) is the principal part side view which shows the lower end part of a screen door and a rail at the time of adjusting the position of a wheel support frame to a position different from FIG. 10 (a) with an adjustment screw, (b) is the door wheel of (a). The front view which looked at the rail from the indoor side, (c) is the rear view which looked at the door wheel and rail of (b) from the outdoor side. (A) is the principal part side view which shows the lower end part and rail of the screen door in the state which the screen door floated and the fall prevention mechanism of the door wheel act | operated, (b) is the door wheel and rail of (a) from the indoor side. The front view seen, (c) is the rear view which looked at the door wheel and rail of (b) from the outdoor side.

  1 shows a screen door 1 for insect protection to which a screen door door cart (hereinafter simply referred to as a “door wheel”) 20 according to the present invention is attached. FIGS. 2 and 3 show the screen door 1 of a house. The state which attached to the sash 10 of opening parts, such as a window and an entrance / exit, so that a horizontal movement is possible is shown.

  2 and 3, 10 a is an upper sash frame of the sash 10, 10 b is a lower sash frame of the sash 10, 10 c is a left and right vertical sash frame of the sash 10, and 11 is a horizontal frame attached to the sash 10. It is an open-type glass shoji.

  A rail 12 for a screen door is formed on the lower sash frame 10b, and a guide 13 for the screen door is formed on the upper sash frame 10a, and a wheel 21 of a door wheel 20 attached to the lower arm 2 of the screen door 1 is formed. Is placed on the rail 12 of the lower sash frame 10b, and the engaging member 6 attached to the upper arm 3 of the screen door 1 is locked from the indoor side to the guide 13 of the upper sash frame 10a. The screen door 1 is attached to the sash 10 at a position outside the glass shoji 11 so as to be laterally movable.

  As shown in FIG. 1, the screen door 1 is configured such that an insect screen 5 is stretched in a rectangular screen door frame composed of the lower heel 2, the upper heel 3 and the left and right vertical ridges 4. The two door wheels 20 are attached to the front surface facing the indoor side with an appropriate distance between each other, and the two engagement members 6 are appropriately disposed between the front surfaces facing the indoor side of the upper collar 3. It is attached keeping the interval of. 2 and 3, reference numeral 7 denotes brushes attached to the upper and lower armpits 3 and 2 of the screen door 1 and the left and right vertical shafts 4, respectively. The screen door 1, the sash 10, the glass shoji 11 and the like This is to prevent insects from entering by closing the gaps between them.

  As shown in FIGS. 4 to 8, the door wheel 20 includes an attachment frame 22 for fixing to the lower rod 2, and a wheel support frame 23 that is incorporated in the attachment frame 22 so as to be vertically stretchable. The wheel 21 supported rotatably on the wheel support frame 23 around a horizontal wheel shaft 24, the lower surface of the upper wall 25 of the mounting frame 22, and the upper surface of the upper wall 26 of the wheel support frame 23. A coil spring 27 that is interposed between the frames 22 and 23 to urge both the frames 22 and 23 in the direction of extension, and is screwed to the upper wall 25 of the mounting frame 22 so that the tip is attached to the upper wall 26 of the wheel support frame 23. The adjustment screw 28 that positions and adjusts the expansion / contraction position of the wheel support frame 23 by moving forward and backward by rotating operation, and lifts the wheel support frame 23 when the screen door 1 is attached and detached And a locking device 29 for locking the shortened position is position.

  In the following description, the surface facing the indoor side of the door 20 is the “front surface”, and the surface facing the outdoor side (the screen door 1 side) is the “rear surface”. This is also common to the parts forming the 20.

  The mounting frame 22 is formed by cutting a metal plate such as a stainless steel plate or an iron plate into a predetermined shape, and then bending the metal plate. The mounting frame 22 has a rectangular container shape when viewed from the front, with the rear surface and the lower surface being opened. The flat and horizontal upper wall 25 whose left and right lengths are longer than the front and rear widths, the flat front vertical wall 30 extending straight downward from the front end of the upper wall 25, and the left and right side ends of the upper wall 25 The left and right side walls 31 extend straight downward from the left and right side walls 31, and the lower end portions of the left and right side walls 31 extend further below the lower end of the front vertical wall 30. A flat plate-shaped mounting portion 32 having a vertically long rectangular shape is continuously connected to the rear end portions of the left and right side walls 31 so as to project laterally, and is fixed to a screw insertion hole 32a formed in the mounting portion 32. The door pulley 20 is fixed to the screen door 1 by inserting the screw 8 (see FIG. 1) and screwing it onto the lower arm 2 of the screen door 1.

  A longitudinally elongated guide groove 33 is formed at a substantially central position in the front-rear direction (width direction) of the left and right side walls 31, and is formed in the guide groove 33 at both left and right ends of the wheel support frame 23. The guide projection 34 is fitted in a vertically movable manner, and the wheel support frame 23 moves up and down within the mounting frame 22 within the range of the length of the guide groove 33, whereby the mounting frame 22 and the wheel The support frame 23 can be expanded and contracted mutually. In other words, the wheel support frame 23 moves up and down between a rising limit position where the guide protrusion 34 is locked to the upper end of the guide groove 33 and a lower limit position where the guide protrusion 34 is locked to the lower end of the guide groove 33. It can be done.

  Further, a recess 31a is formed by cutting out a part of the front end side of the side wall 31 at a lower end portion of the left and right side walls 31, that is, a side wall portion extending downward beyond the lower end of the front vertical wall 30. Then, the horizontal step wall 38 at the lower end of the wheel support frame 23 and the locking edge 39 extending downward from the horizontal step wall 38 move up and down in the recess 31a.

  A screw hole 35 having an internal thread is formed on the inner periphery of the upper wall 25 in the left-right direction, and the adjustment screw 28 is screwed into the screw hole 35 from above. The lower end of the adjustment screw 28 is fitted into the inside of the coil spring 27 from above, and the adjustment screw 28 is moved up and down inside the coil spring 27, whereby the adjustment screw 28 is supported by the wheel support. Positioning and adjusting the position of the frame 23 during expansion and contraction are performed. The adjustment screw 28 also serves as a support member for supporting the upper end portion of the coil spring 27 and a spring guide for guiding expansion and contraction of the coil spring 27.

  Around the screw hole 35 on the lower surface of the upper wall 25, when the screw hole 35 is formed from the upper surface side of the upper wall 25 with a drill, a part of the upper wall 25 bulges downward. By deforming, a cylindrical portion 35 a surrounding the screw hole 35 is formed, and this cylindrical portion 35 a is fitted and locked in the upper end portion of the coil spring 27.

  The upper wall 25 is formed with an elongated hole 36 extending in the left and right direction at a position closer to the rear end side of the upper wall than the screw hole 35, and a part of the locking device 29 is formed in the elongated hole 36. The locking body 47 of the lock lever 45 that forms the shape of the lock lever 45 is movably fitted along the long hole 36. Details of the lock device 29 will be described later.

  The wheel support frame 23 is formed by cutting a metal plate such as a stainless steel plate or an iron plate into a predetermined shape and then bending it in the same manner as the mounting frame 22. The elongated flat and horizontal upper wall 26, a rear vertical wall 37 extending downward from the rear end of the upper wall 26, and a crank with the lower end of the rear vertical wall 37 facing the front side of the wheel support frame 23 The horizontal step wall 38 and the locking edge 39 formed by bending into a shape, the locking edge 39, and a wheel receiver 37a having an arc shape in the center of the lower end portion of the rear vertical wall 37, A space 40 (see FIG. 9A) into which the upper end of the rail 12 of the lower sash frame 10b of the sash 10 is inserted is formed.

  The wheel 21 is made of synthetic resin, has a flange portion 21a at one end in the axial direction, and the wheel support frame is supported by the wheel shaft 24 in a posture in which the flange portion 21a faces the wheel receiver 37a. 23 is rotatably attached. At this time, a part of the lower end of the wheel 21 projects downward from the lateral wall 38 at a position facing the space 40, but occupies a position above the lower end of the locking edge 39. .

  The front-rear width of the wheel support frame 23 (the front-rear width of the upper wall 26) is as narrow as about half of the front-rear width of the mounting frame 22 (front-rear width of the upper wall 25). The left and right lengths 23 are such that they can be fitted into the mounting frame 22 through a small gap that does not rattle with the mounting frame 22 and move up and down without resistance.

  The guide projections 34 are formed at both left and right end portions of the rear vertical wall 37 of the wheel support frame 23 and are fitted in the guide grooves 33, and both left and right end portions of the horizontal step wall 38. Are formed in the recess 31a of the mounting frame 22 with an anti-shake projection 41 that contacts the front edge of the left and right side walls 31, and the anti-shake projection 41 moves up and down along the side wall 31. The wheel support frame 23 can be moved up and down stably.

  A spring receiver 42 having a convex shape is formed at a central position in the left-right direction of the upper wall 26 of the wheel support frame 23 by cutting and raising a part of the upper wall 26 upward. The coil spring 27 is interposed between the spring receiver 42 and the cylindrical portion 35 a on the lower surface of the upper wall 25 of the mounting frame 22 by being fitted to the lower end portion of the coil spring 27.

  Further, a part of the rear vertical wall 37 is raised at a position slightly lowering from the upper end of the rear vertical wall 37 of the wheel support frame 23 and at a position closer to the right side from the center in the rear view. As a result, a locking projection 43 projecting to the rear surface side of the rear vertical wall 37 is formed, and the locking device 29 is formed by the locking projection 43 and the lock lever 45 attached to the mounting frame 22. ing.

  The lock lever 45 is slidably disposed on the upper surface of the upper wall 25 of the mounting frame 22, and moves together with the operator 46 to engage and disengage with the locking projection 43. The operating body 46 and the locking body 47 are integrally formed of a synthetic resin.

The operation element 46 is a horizontally long member having a rectangular shape in plan view, and is visible on the upper surface of the upper wall 25 of the mounting frame 22 and can be moved and operated in the left-right direction along the elongated hole 36. Has been placed. The front-rear width of the operation element 46 is substantially the same as the width of the upper wall 25, and the left and right lengths are slightly shorter than the length of the upper wall 25.
By disposing the operation element 46 at such a position, when the screen door 1 is attached to or removed from the sash 10, the operation element 46 is moved to the locked position or moved to the unlocked position. Can be performed easily and reliably, and it can be accurately confirmed whether the operation element 46 is in the locked position or the unlocked position without causing misunderstanding.

  The locking body 47 has a vertically long plate shape, extends downward from one end in the length direction of the operation element 46, and passes through the long hole 36 of the upper wall 25 of the mounting frame 22 to thereby move the inside of the mounting frame 22. Has entered. A locking bullet piece 47a is formed on the rear surface of the locking body 47, and the locking body 47 is locked to the lower surface of the upper wall 25 of the mounting frame 22 so that the locking body 47 has the long hole 36. So that it does not escape upward. In addition, lateral locking grooves 48 into which the locking protrusions 43 are fitted and locked are formed in one side edge of the locking body 47 in the left-right direction and arranged in a plurality of rows vertically. In the illustrated example, three locking grooves 48 having different groove widths are formed, but the groove widths of the locking grooves 48 may be the same as each other. Alternatively, the number of the locking grooves 48 may be two or one.

  The operating element 46 is formed with a horizontally long screw fitting groove 49 into which the adjusting screw 28 is fitted so as to penetrate the operating element 46 vertically. The screw fitting groove 49 has an arcuate wide portion 49a whose groove width is larger than the outer diameter of the head portion 28a of the adjusting screw 28, and a groove width that is continuous with a part of the wide portion 49a. And a narrow portion 49b smaller than the outer diameter of 28a.

  4 and 5, when the operating element 46 is moved to a position where the adjusting screw 28 is fitted in the wide width portion 49a (an unlocking position), the locking body 47 and the locking protrusion 43 is in a disengaged state, and the wheel support frame 23 is movable up and down (extendable) relative to the mounting frame 22 and rises to a position where it comes into contact with the lower end of the adjustment screw 28 ( And the adjustment screw 28 can be moved up and down to adjust the expansion / contraction position of the wheel support frame 23.

  Further, in a state where the adjustment screw 28 is sufficiently raised and the wheel support frame 23 is raised (shortened) to a position where it comes into contact with the lower end of the adjustment screw 28, the operation element 46 is moved as shown in FIGS. As described above, when the adjustment screw 28 is moved into the position where the adjustment screw 28 is fitted in the narrow width portion 49b (lock position), the locking projection 43 is locked in any locking groove 48 of the locking body 47. At the same time that the wheel support frame 23 is held (locked) in the shortened position, the head 28a of the adjusting screw 28 abuts and engages with the upper surface of the operator 46, whereby the operator 46 is in the locked position. Retained. In this case, the operating element 46 may be fixed by tightening the adjusting screw 28.

  Accordingly, the adjusting screw 28 has a function as a lever locking member for locking the lock lever 45 at the lock position in addition to the function for positioning and position adjustment of the wheel support frame 23. In this way, by providing the adjusting screw 28 with a plurality of functions, it is possible to reduce the number of components and simplify the configuration of the door roller 20 as compared with the case where members having the respective functions are provided individually. .

  FIG. 1 shows the screen door 1 before being built in the sash 10, and at this time, each door wheel 20 is moved to the lock position so that the wheel support frame as shown in FIGS. 23 is locked in the shortened position. In this state, the screen door 1 is attached to the sash 10 from the outdoor side as shown in FIGS. The procedure is as follows.

  First, the screen door 1 is slightly tilted and the upper end portion is inserted from the outdoor side to the indoor side of the guide 13 in the upper sash frame 10a, and the engaging member 6 of the upper rod 3 is locked to the guide 13 from the indoor side, The screen door 1 is lowered straight onto the rail 12 of the lower sash frame 10b, and the wheels 21 of the door wheel 20 attached to the lower rod 2 are placed on the rail 12, so that the screen door 1 is sashed. 10 built. 9A to 9C show the state of the lower end portion of the screen door 1 immediately before the wheel 21 is placed on the rail 12. From this state, the screen door 1 is lowered and the wheel 21 is moved. It is placed on the rail 12. Even after the screen door 1 is thus built, the engaging member 6 is engaged with the guide 13 of the upper sash frame 10a.

  Next, by moving the operating element 46 to the unlocking position (see FIGS. 4 and 5), the locking body 47 is detached from the locking projection 43, and the lock of the wheel support frame 23 is released. Is in use. 10A to 10C show the state of the lower end portion of the screen door 1 in the use state. Thus, when the screen door 1 is in use, the urging force of the coil spring 27 acts on the mounting frame 22 and the wheel support frame 23 in the direction in which both the frames 22 and 23 are extended. Since the load of the screen door 1 acting downward on the mounting frame 22 is larger, the mounting frame 22 is not lifted upward by the coil spring 27, and the wheel support frame 23 always hits the lower end of the adjusting screw 28. It is positioned at the point of contact.

  When increasing the vertical engagement width between the engagement member 6 and the guide 13, the position of the wheel support frame 23 is adjusted by rotating the adjustment screw 28. That is, as shown in FIGS. 11A to 11C, by lowering the adjustment screw 28, the attachment frame 22 is pushed up to extend the attachment frame 22 and the wheel support frame 23 to each other. The distance between the wheel 21 and the engaging member 6 (the vertical width of the screen door 1) is increased.

  In this way, the vertical width of the screen door 1 can be adjusted in accordance with the sash 10 by expanding and contracting the wheel support frame 23 relative to the mounting frame 22 with the adjusting screw 28 in this manner. Even if there is a slight error in the width and the vertical width of the sash 10, the screen door 1 can be securely attached to the sash 10.

  When the screen door 1 is lifted or lifted by the action of an external force, the mounting frame 22 of the door wheel 20 is connected to the lower arm 2 of the screen door 1 as shown in FIGS. Although the wheel support frame 23 is lifted together, the wheel support frame 23 is urged downward by the coil spring 27 so that the wheel support frame 23 extends with respect to the mounting frame 22 and maintains the state in which the wheel 21 contacts the rail 12. The door 20 is prevented from falling off the rail 12.

  The adjustment of the expansion / contraction position of the wheel support frame 23 by the advance / retreat operation of the adjustment screw 28 and the prevention of falling off of the door wheel 20 due to the expansion / contraction of the coil spring 27 include that the guide protrusion 34 of the wheel support frame 23 is a guide groove of the mounting frame 22. This is performed within a range that moves within the area 33. Further, the falling of the door wheel 20 is prevented by further extending the wheel support frame 23 with respect to the mounting frame 22 from the state where the wheel support frame 23 is positioned by the adjusting screw 28. Therefore, the length of the adjusting screw 28 is set such that the adjusting screw 28 is advanced (lowered) as much as possible to lower (extend) the wheel support frame 23 to the positioning lower limit position, as shown in FIG. Even in this case, the guide protrusion 34 is formed in such a length as to occupy a position near the center in the guide groove 33.

  When removing the screen door 1 from the sash 10, as shown in FIGS. 9A to 9C, the wheel support frame 23 is locked in the shortened position by moving the operation element 46 of each door wheel 20 to the lock position. In this state, the screen door 1 is removed from the sash 10 in the reverse procedure of the above-described installation.

DESCRIPTION OF SYMBOLS 1 Screen door 2 Lower arm 21 Wheel 22 Mounting frame 23 Wheel support frame 25, 26 Upper wall 27 Coil spring 28 Adjustment screw 28a Head 29 Locking device 43 Locking protrusion 45 Lock lever 46 Operating element 47 Locking body 48 Locking groove 49 Screw fitting groove 49a Wide part 49b Narrow part

Claims (4)

A mounting frame for fixing to the lower arm of the screen door, a wheel support frame assembled to the mounting frame in a telescopic manner, a wheel rotatably supported by the wheel support frame, the mounting frame and the wheel support frame, a coil spring for urging the wheel supporting frame in the direction of elongation is interposed between, it is screwed to the mounting frame, and forward and backward by the rotation operation, positioning and the shortened position of the shortened position of the wheel supporting frame An adjustment screw that adjusts the position of the wheel, and a lock lever that locks the wheel support frame in a shortened position that contacts the adjustment screw ,
The lock lever includes an operation element arranged to be movable to a position where the lock lever is visible from the outside, and a locking body that moves together with the operation element to engage with and disengage from the wheel support frame. the a, the contracted position wheel support frame engages with the locking member and moves said wheel supporting frame the operator in one direction in a state of moving the wheel supporting frame in the contracted position And when the operating element is moved in the opposite direction, the locking body operates to release from the wheel support frame to release the lock,
The adjustment screw also serves as a lever locking member for locking the lock lever at the lock position.
A screen door cart characterized by that.   The operator of the lock lever has a long and long screw fitting groove into which the adjustment screw is fitted, and the screw fitting groove has a wide width portion whose groove width is larger than the outer diameter of the head of the adjustment screw. , The groove width is made of a narrow part smaller than the outer diameter of the head, and when the operating element is moved to the unlocking position, the adjusting screw is fitted into the wide part, and the adjusting screw is moved forward and backward. Position adjustment and positioning of the wheel support frame become possible, and when the operation element is moved to the lock position, an adjustment screw is fitted into the narrow width portion, and the head of the adjustment screw is locked to the upper surface of the operation element. The screen door door cart according to claim 1, wherein the operating element is held in a locked position.   The wheel support frame is accommodated in the attachment frame so as to be movable up and down, and the coil spring is interposed between the lower surface of the upper wall of the attachment frame and the upper surface of the upper wall of the wheel support frame. The adjustment screw further penetrates the upper wall of the mounting frame and fits into the coil spring, and further serves as a spring guide for guiding expansion and contraction of the coil spring. Door door cart.   The locking body of the lock lever extends downward from the operation element toward the wheel support frame, and has a locking groove in which a locking projection formed on the wheel support frame is fitted and locked on a side surface. A door door for a screen door according to any one of claims 1 to 3.

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