Foldable handle and window opening / closing device

Abstract

To suppress an increase in manufacturing cost, a deterioration in operability, and a decline in design property, in a foldable handle capable of preventing a rotation around a rotation shaft of a handle arm part in a usage state.SOLUTION: A direction of rotation when changing from a folded state to a usage state A is a front F. A slide body 5 has a plate-shaped stopper piece 7 projecting from a handle base part 2 side end of a front end part of the slide body 5, which slides along a rear face I of a front wall 3A of a handle arm part 3. In the usage state A, the handle arm part 3 is stopped against a stopping part H of the handle base part 2. The handle base part 2 in the usage state A has a cutout part having a wall face L facing a rear face 7A of the stopper piece 7. In the usage state A, the stopper piece 7 of the slide body 5 enters into a gap G between the wall face L of the cutout part of the handle base part 2 and the rear face I of the front wall 3A of the handle arm part 3, thereby preventing the rotation around a rotation shaft J of the handle arm part 3.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a folding handle used in a window opening and closing device for opening and closing a sliding screen in an opening and closing window. [Background technology]

[0002] In an opening / closing window in which a shoji screen attached to a window frame opens to the outside, a folding handle is used in a window opening / closing device that opens and closes the shoji screen, and can be changed between a usage configuration in which the drive shaft of the window opening / closing device is rotated when in use and a folded configuration in which the handle is folded when not in use (see, for example, Patent Document 1). Such a folding handle has a handle base attached to the drive shaft and a handle arm that can rotate around a rotation axis relative to the handle base.

[0003] The folding handle is equipped with a rotation prevention mechanism that prevents the handle arm portion from rotating around the rotation axis in order to improve operability when operating the folding handle to rotate the drive shaft when the handle arm portion is unfolded from the folded configuration to the usage configuration.

[0004] The anti-rotation mechanism in the folding handle of Patent Document 1 comprises a plurality of circumferential recesses 601 formed in the pivot shaft member 621, which is the base of the handle, and positioned circumferentially about the pivot shaft J1; an integral part consisting of an engagement shaft portion 819 that engages with the circumferential recesses 601, a driven portion 817 and an engagement shaft portion 816; a guide member that supports the integral part so that it can move in the forward and backward directions relative to the pivot shaft member 621; a compression spring 815 that urges the integral part toward the pivot shaft member 621; and a button 818 having a button inclined surface 8181 that abuts against the driven inclined surface 8171 of the driven portion 817.

[0005] When the handle main body 81, which is the handle arm portion, is folded around the rotation axis J1 relative to the rotation shaft member 621, which is the handle base portion, the button 818 protruding from the upper surface of the handle main body 81 is pressed in the usage mode shown in Figures 2 and 4 of Patent Document 1. This causes the button inclined surface 8181 to press the driven inclined surface 8171, and the driven portion 817 and the engaging shaft portion 819 retract from the rotating shaft member 621 against the biasing force of the compression spring 815, thereby disengaging the circumferential recess 601 from the engaging shaft portion 819. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2020-200694 Summary of the Invention [Problem to be solved by the invention]

[0007] In the folding handle of Patent Document 1, the direction in which button 818 is pressed to change from the usage configuration to the folding configuration is perpendicular to the advance / retract direction of an integrated part consisting of engagement shaft 819, driven part 817, and engagement shaft 816. A force acts on the integrated part in a direction perpendicular to the advance / retract direction via button inclined surface 8181 and driven inclined surface 8171. Therefore, the guide member needs to be provided, for example, in front of and behind driven part 817 in the advance / retract direction so as to support engagement shaft 819 and engagement shaft 816 (see, for example, Figure 4 of Patent Document 1), making it impossible to simplify and compact the structure of the guide member.

[0008] The anti-rotation mechanism in the folding handle of Patent Document 1 consists of multiple circumferential recesses 601 formed in the rotating shaft member 621 which is the base of the handle, the integrated part, the guide member, the compression spring 815, and the button 818, and the large number of parts increases the manufacturing cost.

[0009] Furthermore, the anti-rotation mechanism in the folding handle of Patent Document 1 is structured to engage the engagement shaft portion 819 with the circumferential recess 601, and since there is a gap in this concave-convex engagement portion, there is rattle when the drive shaft is rotated in the above-mentioned usage form of the folding handle, resulting in poor operability.

[0010] Furthermore, the rotation prevention mechanism in the folding handle of Patent Document 1 is configured to house the integrated part and the guide member within the handle main body 81, which is the handle arm part, and to engage the engagement shaft part 819 of the integrated part with the circumferential recess 601, which increases the outer size of the handle arm part and also increases the outer size of the handle base because it is necessary to form multiple circumferential recesses 601 that engage with the engagement shaft part 819 in the circumferential direction of the rotation axis J1 of the rotation shaft member 621, which is the handle base. Therefore, the appearance is not compact and neat, and the design is degraded.

[0011] The present invention aims to provide a folding handle that can prevent rotation of the handle arm around the rotation axis when in use to rotate the drive shaft of a window opening and closing device, without increasing manufacturing costs, without deteriorating operability, and without reducing design. [Means for solving the problem]

[0012] The folding handle according to a first aspect of the present invention has a handle base attached to the drive shaft of a window opening and closing device that opens and closes the shoji screens of an opening and closing window, and a handle arm that can rotate around a rotation axis relative to the handle base, and can change its shape between a usage form in which the drive shaft is rotated when in use, and a folded form in which the handle arm is folded when not in use, and in the usage form, rotation of the handle arm about the rotation axis can be prevented.

[0013] The folding handle includes a slider that slides along the longitudinal direction of the handle arm and is biased by an elastic body toward the handle base. The slider has a plate-shaped stopper piece that protrudes from the handle base side end of the front end of the slider and has a width direction parallel to the rotation axis, and slides along the rear surface of the front wall of the handle arm. The direction in which the handle arm rotates about the rotation axis when changing from the folded configuration to the usage configuration is defined as the front.

[0014] In the usage mode, the handle arm abuts against the abutment portion of the handle base. The handle base has a notch with a wall surface facing the rear surface of the stopper piece. In the usage mode, the stopper piece of the slider enters a gap between the wall surface of the notch in the handle base and the rear surface of the front wall of the handle arm, preventing the handle arm from rotating about the rotation axis.

[0015] According to the folding handle according to the first aspect, in a usage configuration in which the drive shaft of a window opening / closing device is rotated, the stopper piece of the sliding body biased by the elastic body enters the gap between the wall surface of the notch in the handle base and the rear surface of the front wall of the handle arm, and the state in which the stopper piece enters the gap is maintained, thereby preventing the handle arm from rotating around the rotation axis relative to the handle base.

[0016] Therefore, the structure of the rotation prevention mechanism that prevents rotation of the handle arm portion around the rotation axis is simple, and the number of parts is small, so increases in manufacturing costs can be suppressed. Furthermore, the stopper piece is biased by the elastic body in the direction of entering the gap, and the stopper piece is maintained in a state of abutting on the front and rear surfaces that form the gap, so rattle can be suppressed, improving operability when operating the folding handle to rotate the drive shaft of the window opening / closing device in the above-mentioned usage form. Furthermore, the handle base and handle arm portion can be made compact, resulting in a neat appearance and improving design.

[0017] A folding handle according to a second aspect of the present invention is a folding handle according to the first aspect, wherein the rear surface of the stopper piece is a tapered surface that becomes thinner toward the tip of the stopper piece, and the wall surface of the cutout portion is a tapered surface that comes into surface contact with the rear surface of the stopper piece.

[0018] According to the folding handle of the second aspect, in the above-mentioned usage mode, the wedge-shaped stopper piece, biased by the elastic body, enters the gap, and the rear surface of the stopper piece comes into surface contact with the wall surface of the cutout portion of the handle base, thereby increasing the effect of suppressing rattling, and since the pressure acting on the stopper piece is dispersed by the surface contact, there is no risk of the stopper piece being damaged by incorrect operation, etc.

[0019] A folding handle according to a third aspect of the present invention is the folding handle according to the first aspect, wherein a release operating unit is provided at the rear end of the sliding body integrally with the sliding body, which moves the sliding body back from the handle base against the biasing force of the elastic body, in order to release the prevention of rotation of the handle arm section about the rotation axis when changing from the usage configuration to the folded configuration.

[0020] According to the folding handle of the third aspect, the direction in which the release operating part is operated to release the prevention of rotation is parallel to the direction in which the slider is retracted from the handle base. This makes it easier to guide the slider as it advances and retreats relative to the handle base, allowing the handle arm to be made compact. Since the release operating part is provided integrally with the slider at the rear end thereof, the number of parts can be reduced, and in the folded configuration, the release operating part is hidden between the handle arm and the base of the window opening / closing device, making it difficult to see, further improving the design.

[0021] A folding handle according to a fourth aspect of the present invention is the folding handle according to the first aspect, wherein a protrusion is provided integrally with the handle base, the protrusion abutting the sliding body during the transition from the usage configuration to the folded configuration, causing the sliding body to gradually retreat from the handle base against the biasing force of the elastic body, and receiving the biasing force via the sliding body in the folded configuration.

[0022] According to the folding handle of the fourth aspect, when the handle is shifted from the usage configuration to the folded configuration, the protrusion formed integrally with the handle base abuts against the slider, gradually retracting the slider from the handle base against the biasing force of the elastic body, and in the folded configuration, the biasing force is received via the slider. Therefore, when shifting to the folded configuration, a responsive feeling is felt, which provides a comfortable operational feel, improving operability and enabling the folded configuration to be maintained.

[0023] A window opening and closing device according to a fifth aspect of the present invention includes the folding handle according to any one of the first to fourth aspects. [Effects of the Invention]

[0024] As described above, the folding handle of the present invention is a folding handle that can prevent rotation around the rotation axis of the handle arm portion when in use to rotate the drive shaft of a window opening and closing device, which can suppress increases in manufacturing costs and improve operability and design. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a perspective view of a window opening / closing device having a folding handle according to an embodiment of the present invention, showing a state in which the folding handle is in use. [Figure 2] FIG. 4 is a perspective view of the opening / closing window, showing the folding handle in a folded state. [Figure 3] FIG. 4 is a cross-sectional view showing the folding handle in use. [Figure 4]FIG. 4 is a cross-sectional view showing the folding handle in a folded configuration. [Figure 5] FIG. 2 is an exploded perspective view of the folding handle. [Figure 6] 5 is an explanatory view of the operation of the folding handle, showing a state in which the handle arm portion has been rotated forward from the folded state of FIG. 4. [Figure 7] 7 is an explanatory view of the operation of the folding handle, showing a state in which the handle arm portion has been rotated further forward from the state in FIG. 6. FIG. [Figure 8] 8 is an explanatory view of the operation of the folding handle, showing the state in which the handle arm portion is further rotated forward from the state in FIG. 7 to assume the usage mode. [Figure 9] 9 is an explanatory view of the operation of the folding handle, showing a state in which the handle arm portion is rotated rearward from the state in FIG. 8. FIG. [Figure 10] 10 is an explanatory view of the operation of the folding handle, showing a state in which the handle arm portion has been rotated further rearward from the state in FIG. 9. DETAILED DESCRIPTION OF THE INVENTION

[0026] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0027] Orientation Definition Hereinafter, in a folding handle 1 having a handle arm portion 3 that can rotate around a rotation axis J relative to the handle base portion 2, the direction in which the handle arm portion 3 rotates around the rotation axis J when changing from usage configuration A (Figure 3) to folding configuration B (Figure 4) will be referred to as "rear" or "rearward" (arrow R in the figure), and the direction in which the handle arm portion 3 rotates around the rotation axis J when changing from folding configuration B (Figure 4) to usage configuration A (Figure 3) will be referred to as "front" or "forward" (arrow F in the figure).

[0028] [Window opening and closing device] The window opening and closing device C shown in Figure 1-2 opens and closes a shoji screen attached to a window frame in an opening and closing window E, which opens the shoji screen toward the outside of the room, and is equipped with a folding handle 1 that can be changed between a usage form A (Figure 1) and a folding form B (Figure 2).

[0029] [Foldable handle] In usage mode A shown in Figures 1 and 3, the folding handle 1 can rotate the drive shaft D of the window opening / closing device C around the center of rotation O. In usage mode A shown in Figure 3, the folding handle 1 has the abutment stop portion 3B of the handle arm portion 3 abutted against the abutment stop portion H of the handle base 2. Therefore, the handle arm portion 3 cannot be rotated forward F around the rotation axis J. In addition, the stopper piece 7 of the slide body 5 enters the gap G between the wall surface L of the cutout portion K of the handle base 2 and the rear surface I of the front wall 3A of the handle arm portion 3. Therefore, the handle arm portion 3 cannot be rotated backward R around the rotation axis J.

[0030] When switching from the usage configuration A shown in Fig. 3 to the folding configuration B shown in Fig. 4, the release operation unit 8 is operated so as to move it away from the handle base 2, and the sliding body 5 is slid away from the handle base 2. This causes the stopper piece 7 of the sliding body 5 to come out of the gap G, allowing the handle arm unit 3 to be rotated rearward R around the rotation axis J. The release operation unit 8 is provided integrally with the sliding body 5, and the direction in which the release operation unit 8 is operated is parallel to the direction in which the sliding body 5 slides.

[0031] Referring to Figure 5, a rivet 10 is inserted through the through-hole 3a at the base end of the handle arm 3 and the through-hole 2a in the handle base 2 to fasten the shaft end. This allows the handle arm 3 to be attached to the handle base 2 so as to be rotatable around the rotation axis J.

[0032] A plain bearing 12 is fitted onto the support shaft 11 of the handle arm portion 3. In this state, a head 11A at the tip of the support shaft 11 abuts against the end face of the plain bearing 12 as shown in Figure 3-4, so that the plain bearing 12 is prevented from coming off.

[0033] The support shaft 11 and the plain bearing 12 are inserted into the recess 4A (Fig. 3-4) of the knob part 4. As a result, as shown in Fig. 3-4, the locking part 12A of the plain bearing 12 is locked into the locking part 4B of the knob part 4. The knob part 4 is prevented from coming off the support shaft 11 and the plain bearing 12, and becomes rotatable around the center of rotation N.

[0034] See Figures 3-5. The slide body 5 is housed in the handle arm section 3 so that the front surface of the slide body 5 is aligned with the rear surface of the front wall 3A of the handle arm section 3. A compression coil spring 6, which is an elastic body, is attached between the wall surface U of the handle arm section 3 and the spring receiving portion Q of the slide body 5. Therefore, the slide body 5 slides along the longitudinal direction of the handle arm section 3 and is biased by the compression coil spring 6 in a direction approaching the handle base section 2.

[0035] The sliding body 5 has a plate-shaped stopper piece 7 at its front end. That is, the stopper piece 7 protrudes from the handle base 2 side end of the sliding body 5, and slides along the rear surface I (FIGS. 3-4) of the front wall 3A of the handle arm 3 with the direction parallel to the rotation axis J as the width direction M (FIG. 5).

[0036] In the usage mode A shown in Figure 3, the handle base 2 has a notch K with a wall surface L facing the rear surface 7A of the stopper piece 7. The rear surface 7A of the stopper piece 7 is a tapered surface that becomes thinner toward the tip side of the stopper piece 7. Therefore, the stopper piece 7 is wedge-shaped. Furthermore, the wall surface L of the notch K is a tapered surface that comes into surface contact with the rear surface 7A of the stopper piece 7.

[0037] The handle base 2 has a protrusion 9 at the rear of the handle base 2 in the usage configuration A shown in Fig. 3. In the folded configuration B shown in Fig. 4, the wall surface 5A of the slider 5 abuts against the wall surface 9A of the protrusion 9, and the wall surface 5A is pressed against the wall surface 9A by the compression coil spring 6, thereby maintaining the folded configuration B. In the folded configuration B where the wall surface 5A abuts against the wall surface 9A, the handle arm portion 3 cannot be moved rearward R.

[0038] The folding handle 1 is attached to the drive shaft D of the window opening / closing device C as follows: The spline hole 2A (Fig. 5) of the handle base 2 is fitted onto the spline shaft T of the drive shaft D of the window opening / closing device C shown in Fig. 3-4. The folding handle 1 is attached to the drive shaft D by threading a set screw 13 into the attachment hole 2B shown in Fig. 5.

[0039] [Operation description] (From folded state to usable state) In the folded form B of Figure 4, when the handle arm portion 3 is unfolded by rotating the handle arm portion 3 forward F, first, the wall surface 5A of the sliding body 5 comes into contact with the R surface 9B at the upper end of the wall surface 9A of the protrusion 9, as shown in Figure 6.

[0040] When the handle arm portion 3 is moved from the state shown in FIG. 6 as indicated by the arrow F1, the tip of the stopper piece 7 comes into contact with the arcuate surface P of the handle base portion 2 as shown in FIG.

[0041] When the handle arm portion 3 is moved from the state shown in Figure 7 in the direction of arrow F2, the handle arm portion 3 can no longer be rotated forward F around the rotation axis J at a position where the abutment stop portion 3B of the handle arm portion 3 abuts and stops against the abutment stop portion H of the handle base 2 shown in Figure 3, resulting in usage mode A shown in Figures 3 and 8.

[0042] In other words, the slide body 5 is biased by the compression coil spring 6 in the direction approaching the handle base 2, so when the handle arm portion 3 is moved from the state shown in Figure 7 as indicated by arrow F2, the handle arm portion 3 moves forward while maintaining the tip of the stopper piece 7 in contact with the arc surface P of the handle base 2.

[0043] When the tip of the stopper piece 7 passes over the arc surface P, the biasing force of the compression coil spring 6 causes the tip of the stopper piece 7 to automatically enter the gap G as shown in Figure 3, resulting in usage mode A. In usage mode A, the handle arm portion 3 cannot be rotated forward F or backward R around the rotation axis J.

[0044] By operating the knob 4 in usage mode A, the handle arm 3 and the handle base 2 can be rotated around the rotation center O. This causes the drive shaft D of the window opening / closing device C to rotate around the rotation center O, allowing the sliding screen of the opening / closing window E shown in Figure 1 to be opened or closed.

[0045] (From use to folded state) In usage mode A in Figure 8, when the release operation part 8 is operated with a finger so as to move in the release operation direction V, the stopper piece 7 can be removed from the gap G (Figure 3). With the stopper piece 7 removed from the gap G, the handle arm part 3 can be moved rearward as shown by arrow R1 in Figure 8.

[0046] In the state shown in Figure 9 where the handle arm portion 3 is moved slightly rearward with the tip of the stopper piece 7 coming out of the gap G, the tip of the stopper piece 7 abuts against the arc surface P of the handle base portion 2, so that the finger can be released from the release operating portion 8.

[0047] When the handle arm portion 3 is moved further rearward from the state shown in Figure 9 as indicated by arrow R2, the corner S at the rear end of the wall surface 5A of the sliding body 5 comes into contact with the R surface 9B at the upper end of the wall surface 9A of the protrusion 9, as shown in Figure 10.

[0048] When the handle arm portion 3 is further moved rearward from the state shown in Figure 10 as indicated by arrow R3, the folding configuration B shown in Figure 4 is achieved, in which the wall surface 5A of the sliding body 5 comes into surface contact with the wall surface 9A of the protrusion 9. In the folding configuration B, the wall surface 5A is pressed against the wall surface 9A by the compression coil spring 6, so that the folding configuration B is maintained.

[0049] The protrusion 9 provided on the handle base 2 comes into contact with the sliding body 5 during the transition from usage configuration A to folding configuration B, and gradually moves the sliding body 5 back from the handle base 2 against the biasing force of the compression coil spring 6. In folding configuration B, the protrusion 9 receives the biasing force of the compression coil spring 6 via the sliding body 5.

[0050] [Action and effect] According to the folding handle 1 according to the embodiment of the present invention, in usage configuration A, which is the configuration when used to rotate the drive shaft D of the window opening / closing device C, the stopper piece 7 of the sliding body 5, which is biased by the compression coil spring 6, enters the gap G between the wall surface L of the notch K in the handle base 2 and the rear surface I of the front wall 3A of the handle arm portion 3, and the state in which the stopper piece 7 enters the gap G is maintained. This prevents the handle arm portion 3 from rotating around the rotation axis J relative to the handle base 2.

[0051] Therefore, the structure of the rotation prevention mechanism that prevents rotation of the handle arm portion 3 around the rotation axis J is simple, and the number of parts is small, so increases in manufacturing costs can be suppressed. Also, the stopper piece 7 is urged by the compression coil spring 6 in the direction of entering the gap G, and the stopper piece 7 is kept in contact with the front and rear surfaces I and L that form the gap G, so rattle can be suppressed, improving operability when operating the folding handle 1 to rotate the drive shaft D of the window opening / closing device C in usage mode A. Furthermore, the handle base 2 and handle arm portion 3 can be made compact, resulting in a neat appearance, and improving design.

[0052] According to the folding handle 1 of the embodiment of the present invention, in usage mode A, the wedge-shaped stopper piece 7 biased by the compression coil spring 6 enters the gap G, and the rear surface 7A of the stopper piece 7 comes into surface contact with the wall surface L of the cutout portion K of the handle base 2, thereby increasing the effect of suppressing rattling, and since the pressure acting on the stopper piece 7 is dispersed by the surface contact, there is no risk of the stopper piece 7 being damaged by incorrect operation, etc.

[0053] According to the folding handle 1 according to the embodiment of the present invention, the release operation unit 8 is provided integrally with the sliding body 5 at the rear end thereof, and the release operation direction V (FIG. 8) is parallel to the direction in which the sliding body 5 is retracted from the handle base 2. This makes it easy to guide the sliding body 5 as it advances and retreats relative to the handle base 2, allowing the handle arm unit 3 to be made compact. Because the release operation unit 8 is provided integrally with the sliding body 5 at the rear end thereof, the number of parts can be reduced, and in the folded form B shown in FIG. 2, the release operation unit 8 is hidden between the handle arm unit 3 and the base of the window opening / closing device C and is therefore difficult to see, further improving the design.

[0054] According to the folding handle 1 of the embodiment of the present invention, the sliding body 5 is biased by the compression coil spring 6 in a direction approaching the handle base 2, so that there is a tangible response during the transition from a state in which the corner S of the sliding body 5 abuts against the R surface 9B of the protrusion 9 as shown in FIG. 10 to a state in which the wall surface 5A of the sliding body 5 is in surface contact with the wall surface 9A of the protrusion 9 as shown in FIG. 4, which provides a comfortable operating feel and improves operability while allowing the folding form B to be maintained.

[0055] The above description of the embodiments is given by way of example only and is not intended to be limiting, and various improvements and modifications can be made without departing from the scope of the present invention. [Explanation of symbols]

[0056] 1 Folding handle 2 Handle base 2A Spline hole 2B Mounting hole 2a Through hole 3 Handle arm 3A Front wall 3B Stop part 4 Knob 4A Recess 4B Locking portion 5 Slide body 5A Wall 6 Compression coil spring (elastic body) 7 Stopper piece 7A Rear 8 Release operation part 9 Projection part 9A Wall surface 9B R surface 10 Rivet 11 Support shaft 11A Head 12 Slide bearing 12A Locking part 13 Set screw A. Usage form B. Folded form C Window opening / closing device D Drive shaft E Opening window F Front G Gap H Stopping part I Rear J Rotation axis K Notch L Wall M Width direction N Rotation center O Rotation center P Arc surface Q Spring bearing part R Rear S-angle T-spline shaft U Wall V Release operation direction

Claims

1. A folding handle has a handle base attached to a drive shaft of a window opening / closing device that opens and closes a sliding screen of an opening / closing window, and a handle arm that is rotatable around a rotation axis relative to the handle base, and can be changed between a usage configuration in which the drive shaft is rotated when in use and a folded configuration in which the handle arm is folded when not in use, and in which rotation of the handle arm around the rotation axis can be prevented when in the usage configuration, a slider that slides along the longitudinal direction of the handle arm and is biased by an elastic body in a direction approaching the handle base, The direction in which the handle arm portion rotates around the rotation axis when changing from the folded configuration to the usage configuration is defined as the front, the slider has a plate-shaped stopper piece that protrudes from the handle base side end of the front end of the slider, has a width direction parallel to the pivot axis, and slides along the rear surface of the front wall of the handle arm portion, In the usage mode, the handle arm portion is abutted against and stopped by the abutment stop portion of the handle base, the handle base has a notch having a wall surface facing the rear surface of the stopper piece in the usage mode, In the above-described usage mode, the stopper piece of the slider enters a gap between a wall surface of the notch in the handle base and a rear surface of the front wall of the handle arm, thereby preventing the handle arm from rotating around the rotation axis. Foldable handle.

2. the rear surface of the stopper piece is a tapered surface that becomes thinner toward the tip end of the stopper piece, a wall surface of the notch portion is a tapered surface that comes into surface contact with the rear surface of the stopper piece; The folding handle of claim 1.

3. a release operation unit that moves the slider back from the handle base against the biasing force of the elastic body in order to release the prevention of rotation of the handle arm unit about the rotation axis when changing from the usage configuration to the folding configuration, and that is provided integrally with the slider at the rear end of the slider; The folding handle of claim 1.

4. a protrusion that abuts against the slider during the transition from the usage configuration to the folding configuration, causing the slider to gradually retreat from the handle base against the biasing force of the elastic body, and that receives the biasing force via the slider in the folding configuration, is provided integrally with the handle base; The folding handle of claim 1.

5. A window opening and closing device comprising the folding handle according to any one of claims 1 to 4.

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