JP3732195B2 - Sliding door lock device - Google Patents

Description

  The present invention is installed in a door of a toilet or the like, and belongs to the technical field of a door lock device in which a lock means is provided on the inside of the door and a door handle is provided on the outside. Specifically, the lock bar is slidably engaged with the mounting block provided in the lock means, and the lock bar is reciprocally slid to lock and unlock the door. The present invention relates to a sliding door lock device that switches and displays a door locking / unlocking state.

  Conventionally, this type of sliding door lock device, for example, as shown in FIG. 12, is fastened with an inner locking means a for locking and unlocking the door d and an outer handle b sandwiched between the doors d, At the same time that the grooved lock bar 2 is slidably engaged with the mounting block 1 provided in the lock means a, and the door d is closed and then slid back and forth to lock and unlock the door d from the inside. The slide of the lock bar 2 is converted into a rotational motion by the rack and pinion mechanism, and the rotation is transmitted to the disc-shaped display plate 4 attached to the shaft tip of the rotary shaft 3, and different division indications provided on the display plate 4 The screen is switched to display the locked / unlocked state of the door d from the display window 5 of the handle b to the outside.

  Therefore, the lock means a is provided with a rack 6 along the longitudinal direction on one side in the lock bar 2, and a pinion gear 7 that meshes with the rack 6 at the base end of the rotary shaft 3, and the rotary shaft 3 is attached to the mounting block 1. Is held rotatably. Further, the rotary shaft 3 is provided with a reduction gear train g at the shaft tip, and the rotary shaft 3 is connected to the display plate 4 via the reduction gear train g.

  Therefore, normally, when the lock bar 2 is slid back and forth for a predetermined stroke, the door d is locked and unlocked accordingly, and at the same time, the pinion gear 7 rotates forward and backward through meshing with the rack 6, and the rotation is reduced. The speed is decelerated in the row g and transmitted to the display board 4, and each time the display board 4 is rotated halfway in the forward and reverse directions, the different display screens of the display board 4 facing from the display window 5 are switched according to the direction of rotation. Thus, the unlocked state of the door d is displayed outside.

On the other hand, when an emergency occurs, such as when the user falls in the toilet in the locked state, an operation tool such as an emergency unlocking key is displayed from the display window 5 to the display board 4 from the outside of the door d. When the pinion gear 7 is inserted into the central small hole and rotated, the pinion gear 7 rotates integrally with the rotating shaft 3, and the lock d 2 is slid in the unlocking direction through the meshing with the rack 6 to unlock the door d. .
Japanese Utility Model Publication No. 7-14042

  However, in the above-described conventional sliding door lock device, even if the lock bar 2 slides for a predetermined stroke and the pinion gear 7 rotates several times, the display plate 4 can always be switched halfway in the forward and reverse directions. Since the speed reduction gear train g is incorporated between the pinion gear 7 and the display plate 4 and the speed reduction mechanism is provided, the number of parts increases, the structure becomes complicated, and the assembly of the apparatus becomes troublesome and expensive. There were drawbacks.

  Therefore, although not known, the applicant has proposed a sliding door lock device that does not include a separate speed reduction mechanism and enables the switching display of the door locking / unlocking state using a display board.

  In this conventional sliding door lock device, as shown in FIG. 13, the rack 6 of the lock bar 2 is provided on the display switching gear portion 6a in the middle portion in the longitudinal direction and on both sides in the longitudinal direction of the gear portion 6a. The emergency unlocking gears 6b and 6c are divided into the parts. In particular, the display switching gear portion 6a is formed with a number of teeth that allow the pinion gear 7 to rotate integrally with the display plate 4 when the lock bar 2 is slid and the pinion gear 7 is rotated. ing. Further, the emergency unlocking gear portions 6b and 6c are formed at positions closer to the groove bottom surface 2a of the lock bar 2 than the display switching gear portion 6a in the installation height position. The rotating shaft 3 is normally urged to the groove bottom surface 2a side of the lock bar 2 by a positioning urging spring (not shown), and the pinion gear 7 is positioned and supported at a height position where it can mesh with the display switching gear portion 6a. It has a configuration.

  Therefore, normally, when the lock bar 2 is slid back and forth for a predetermined stroke, the door is locked and unlocked at the same time. At the same time, when the rack 6 is engaged with the pinion gear 7 by the display switching gear portion 6a, each time The display panel is rotated halfway in the opposite direction, and the display section of the display board is switched according to the direction of rotation to display the door locking / unlocking state to the outside. On the other hand, in the event of an emergency, an emergency unlocking operation tool is inserted into the center small hole of the display board from the outside of the door, and the rotary shaft 3 is pushed into the door against the positioning biasing spring to Engage with the unlocking gear 6c. Then, the operation tool is rotated in the unlocking direction to rotate the pinion gear 7, and the lock bar 2 is slid to the unlocking position via the meshing with the rack 6 to unlock the door.

  However, such a conventional sliding door lock device has an advantage that a speed reduction mechanism is not required. However, each time the lock bar 2 is slid back and forth, the pinion gear 7 that rotates forward and backward together with the rotary shaft 3 and the display plate each time. Depending on the strength of the centrifugal force, even if the pinion gear 7 passes through the meshing position with the display switching gear portion 6a, the pinion gear 7 may turn more than half a turn. Therefore, as a result of repeating the sliding operation of the lock bar 2, the rotation angle of the display board is shifted over time, and accordingly, the door locking / unlocking state is accurately switched and displayed on the division display surface of the display board. There was a problem that it was impossible to do.

  Accordingly, an object of the present invention is to provide a sliding door lock device that can always display a switching state of a door locking / unlocking state with a display plate accurately without any deviation without adding a speed reduction mechanism or the like to cause a complicated structure. It is to provide.

Therefore, in order to solve the above-described problem, the invention described in claim 1 includes, for example, an inner locking means A for locking and unlocking the door D and an outer handle B as shown in the embodiment shown below. Fastened across D, engages the mounting block 11 provided in the locking means A with a substantially groove-like lock bar 10 slidably, and slides the lock bar 10 to disengage the door D from the inside. Simultaneously with the locking, the sliding of the lock bar 10 is converted into a rotational motion by a rack and pinion mechanism, and the rotation is transmitted to the display board 40 attached to the shaft tip of the rotary shaft 30, and different division indications on the display board 40 are transmitted. In the sliding door lock device that switches the surface and displays the unlocked state of the door D from the display window 45 of the handle B, the following (A), (B), (C), (D), (E) and (F) constituent requirements Characterized in that it comprises Te.
That is, (A) The lock bar 10 of the lock means A is provided with a rack 20 inward along the longitudinal direction, and the rack 20 is connected to the display switching gear portion 20a in the middle portion in the longitudinal direction and the gear. And the emergency unlocking gear portions 20b and 20c provided on both sides of the portion 20a and closer to the groove bottom surface 15 than the groove portion bottom surface 15a. A rotation restriction groove 21 parallel to the rack 20 is provided, and the rotation restriction groove 21 is formed by a tapered groove having a groove surface in a direction in which the groove width gradually narrows in the depth direction; A pinion gear 30b that meshes with the rack 20 is provided at the base end, and the pinion gear 30b is supported by the mounting block 11 so as to be rotatable and movable in the axial direction. (D) Corner 33, and a guide piece 35 in which a compression coil spring 34 is wound around the square hole 33 is inserted in a retractable manner. (E) In the guide piece 35, the rotation restricting groove 21 is provided at the distal end side. (F) The mounting block 11 attaches the rotating shaft 30 to a biasing spring 31 like an urging spring 31. The tip engaging portion 36b is formed with a tapered surface t corresponding to the tapered groove shape of FIG. The pinion gear 30b meshes with the display switching gear portion 20a of the rack 20 by constantly urging it toward the groove bottom surface 15 of the lock bar 10 by the urging means, and the tip engaging portion 36b of the guide piece 35 is the rotation restriction. It is configured to have six constituent elements of positioning and holding at a position where the groove 21 is engaged.

  According to the first aspect of the present invention, (1) normally, when the door is locked and unlocked by sliding the lock bar from the inside of the door, the pinion gear passes out of engagement with the display switching gear portion of the rack. At the same time, the tip engagement portion of the guide piece engages with the rotation restricting groove, and further rotation of the pinion gear is restricted by the guide piece, so that the pinion gear can be disengaged from the display switching gear portion. After rotation, it is not affected by centrifugal force, and if it rotates halfway together with the display board, further rotation is always prevented, so that the door lock / unlock state on the display screen of the display board is always accurate and accurate. The display can be switched from the display window to the outside. (2) On the other hand, also when the emergency unlocking is performed from the outside of the door, the guide piece has the tip engaging portion engaged with the rotation restricting groove. However, in the sliding door lock device of the present invention, when the rotating shaft is pushed in and rotated during this emergency unlocking, the pinion gear is engaged with the emergency unlocking gear portion, while in the square hole of the rotating shaft. Since the compression coil spring is compressed and the guide piece is slightly pulled into the square hole by the compression distance, the taper surface of the tip engagement portion against the groove surface of the rotation restricting groove against the spring property of the compression coil spring. As a result, even if the guide piece is engaged with the rotation restricting groove, it is easy to rotate the pinion gear and unlock the lock bar in the unlocking direction even if the guide piece is engaged with the rotation restricting groove. Can be slid.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 are exploded perspective views showing a sliding door lock device as an example of the present invention. The sliding door lock device includes a lock unit A attached to the inside of the door D in a toilet, for example, and a handle B attached to the outside, with the door D interposed therebetween.

  The locking means A includes a metal lock bar 10 and a resin mounting block 11. The lock bar 10 is formed in a substantially groove shape as a whole. In particular, on the opposing long inner side surfaces, protruding rail portions 13 and 14 are provided along the opening edge of the groove opening 12, and these protruding stripes are provided. Guide long grooves 16 and 16 are formed between the rail portions 13 and 14 and the groove bottom surface 15. Further, the outer side surface is slightly narrowed inward in the longitudinal direction with respect to each other inwardly, and a gripping portion 17 is formed there. The lock bar 10 is formed in a deformed groove shape by opening a groove on the lock side of one end and opening the insertion port 18 of the mounting block 11 there.

  As shown in FIG. 3, the lock bar 10 is partially cut away in the length direction as shown in FIG. 3, and the lock bar 10 has a notch at both end faces between the locking position and the unlocking position. The abutting step portions 13a and 13b for regulating the sliding trolley are provided. Further, as shown in FIG. 1, the groove bottom surface 15 is provided with a rectangular groove 19 that is recessed in the depth direction and is vertically long and shallow. The rectangular groove 19 is provided with a rack 20 inward along the longitudinal direction at the groove edge 19a on one side. The rack 20 includes a display switching gear portion 20a in the middle in the length direction and emergency unlocking gear portions 20b and 20c on both sides of the gear portion 20a. The display switching gear portion 20a meshes with a pinion gear 30b, which will be described later in detail (see FIG. 4). However, when the pinion gear 30b is rotated by sliding the lock bar 10, the pinion gear 30b is integrated with the display plate 40 halfway. It is formed by providing teeth with the number of meshes that rotate. As shown in FIG. 1, the emergency unlocking gear portions 20b and 20c have different installation height positions from the display switching gear portion 20a, and are provided at a height position closer to the bottom surface 19b of the rectangular groove 19 than that. ing.

  In addition, as shown in FIGS. 1 and 3, the lock bar 10 is provided with an elongated rotation restricting groove 21 parallel to the rack 20 at the center of the bottom surface 19 b of the rectangular recessed groove 19. The rotation restricting groove 21 is provided on the right side of the restriction groove portions 21a and 21b corresponding to the emergency unlocking gear portions 20b and 20c of the rack 20 and on the right side thereof corresponding to the display switching gear portion 20a. It is comprised with the groove part 21c. The regulation groove portions 21a and 21b are formed in a tapered groove shape having a substantially V-shaped cross section by providing a groove surface in a direction in which the groove width gradually decreases in the depth direction (see FIG. 5). On the other hand, the escape groove 21c is formed slightly wider than the diameter of the pinion gear 30b (see FIG. 3).

  The mounting block 11 is manufactured by insert resin molding, for example, and as shown in FIGS. 1 and 2, guide rail portions 26 and 26 that are recessed along the longitudinal direction are integrally formed on both symmetrical side surfaces of the mounting body 25. At the same time, tube-shaped studs 27 and 27 each having a female screw hole screwed to the inner periphery are provided upright from the component assembly surface 11a of the mounting body 25. Further, the mounting main body 25 is formed in accordance with its outer shape in order to incorporate a through hole 25a for supporting the rotary shaft 30 and a biasing spring 31 on the part assembly surface 11a between the studs 27 and 27. The insertion narrow groove 25b and a mounting notch 25c formed in accordance with the outer shape for assembling the stopper 32 are recessed.

  The rotary shaft 30 is integrally formed of resin, and a pinion gear 30b is provided at the base end of the main shaft portion 30a having a square shaft shape, and a ring-shaped spring pressing portion 30c is provided at a distance from the pinion gear 30b toward the tip. Is provided. In addition, the rotating shaft 30 has a square hole 33 formed in the axial direction from the base end face of the pinion gear 30b as shown in FIG. 6, and in a rib shape near the hole edge of the opposing inner wall surface in the square hole 33. A protruding protrusion 33a that protrudes is formed. And the guide piece 35 is inserted in the square hole 33 by the compression shaft spring 34 so that it can protrude and retract in the rotating shaft 30 of such a shape.

  The guide piece 35 is made of metal and is a polyhedral piece main body portion 36 that can be engaged with the square hole 33 of the rotating shaft 30, and a coil mounting shaft portion 37 that protrudes from the base end surface of the piece main body portion 36. Consists of. The piece main body portion 36 is provided with an engaging rib 36a projecting on a symmetrical side surface thereof, and a tip engaging portion 36b opposite to the shaft portion 37 is gradually tapered with a tapered surface t. It is formed to have a substantially V-shaped cross section in accordance with the tapered groove shape of the ten restriction groove portions 21a and 21b. The guide piece 35 having such a shape is inserted by inserting the compression coil spring 34 around the shaft portion 37 and pushing the piece main body portion 36 into the square hole 33 of the rotary shaft 30, and the engagement rib 36 a is prevented from coming off. The tip engaging portion 36b is normally held in a state protruding from the square hole 33.

  As shown in FIGS. 1 and 2, the urging spring 31 is bent so that the main body shaft portion 30 a of the rotating shaft 30 can be sandwiched between the pinion gear 30 b and the spring pressing portion 30 c, and the spring force is a compression coil of the rotating shaft 30. It is made of a leaf spring material stronger than the spring 34. The stopper 32 is formed by bending a relatively thick metal piece into an L plate shape. The stopper plate 32 is provided with a mounting plate portion 32a on one piece, and an abutting plate portion 32b on the other piece. In addition, the code | symbol 37 in a figure is the exterior cover which covers the components assembly surface 11a of the attachment block 11. FIG. Therefore, the outer cover 37 is provided with insertion holes 37a through which the studs 27 and 27 and the spring pressing portion 30c of the rotary shaft 30 are passed.

  In the lock means A, the mounting block 11 described above is inserted into the lock bar 10 through the insertion port 18, and the guide rail portions 26 and 26 are engaged with the guide long grooves 16 and 16 for assembly. In the mounting block 11, with the biasing spring 31 sandwiched between the pinion gear 30b and the spring holding portion 30c, the pinion gear 30b is inserted into the through hole 25a, and the biasing spring 31 is inserted into the insertion slot 25b to rotate. The shaft 30 is erected so as to be movable in the axial direction. At this time, the rotating shaft 30 is constantly urged toward the groove bottom surface 15 side of the lock bar 10 by the urging spring 31, the pinion gear 30 b meshes with the display switching gear portion 20 a of the rack 20, and the tip engagement of the guide piece 35. The portion 36b is positioned and held at a position where it engages with the restriction groove portions 21b and 21c of the rotation restriction groove 21.

  The stopper 32 has the abutting plate portion 32b applied to the side surface of the mounting block 11, and one mounting plate portion 32a is fitted into the mounting notch 25c to be fixed. Then, the exterior cover 37 is put on the component mounting surface 11a of the mounting block 11, and the locking means A is assembled as shown in FIG.

  On the other hand, the handle B includes a display board 40, a handle case 41, and a mounting bracket 42 as shown in FIGS. The display plate 40 has a tube shaft-shaped rotation receiving shaft 44 erected at the center of the back surface of the disc 43. A hollow hole 44 a in the rotation receiving shaft 44 is a through hole formed in a substantially rectangular shape in accordance with the angular axis shape of the rotation shaft 30, and penetrates the center of the disk 43. The hollow hole 44a is formed by forming a hole shape from the middle position in the depth direction to the opening at the center of the disk with a smaller diameter, and providing a step at the position of the middle hole. The disc 43 is provided with a semi-circular division display surface that divides the surface of the plate into two equal parts and identifies the locking / unlocking state of the door D.

  The handle case 41 is made of a resin and formed into a cap shape. An emergency operation hole 41a is provided in the center of the elliptical surface so that the hollow hole 44a of the rotary shaft 44 can be faced, and is displayed adjacent to the emergency operation hole 41a. A window 45 is opened. The mounting bracket 42 is provided with an insertion hole 42a through which the rotation receiving shaft 44 of the display plate 40 passes. In the figure, reference numeral 46 denotes an O-ring made of a leaf spring.

  In the handle B, the mounting bracket 42 is assembled at a predetermined mounting position of the door D in which mounting holes x, y, and z are previously drilled. The mounting bracket 42 is screwed at a predetermined position of the door D with the insertion hole 42a aligned with the intermediate mounting hole y. On the other hand, on the lock means A side, from the inside of the door D, the rotary shaft 30 and the studs 27 and 27 are inserted into the mounting holes x, y, and z, respectively, while from the handle B side, the rotary bearing shaft of the display plate 40 is inserted. 44 is inserted into the intermediate mounting hole y, and the rotary shaft 30 is engaged through the O-ring 46. Then, the screws 49 and 49 are screwed into the female screw holes of the studs 27 and 27, and the locking means A is fastened to the mounting bracket 42 of the handle B with the door D interposed therebetween. Then, the display plate 40 is covered, and the handle case 41 is put on the mounting bracket 42 and screwed to the mounting bracket 42. In this way, the sliding lock device is assembled and assembled to the door D as shown in FIG.

  Now, when using the sliding lock device having the above-described configuration, when the door D is locked, the slide lock device is slid in the direction indicated by the arrow in FIG. When the lock bar 10 is slid by the distance of the sliding stroke L, the abutting plate portion 32b of the stopper 32 abuts against the abutting step portion 13a on one side of the ridge rail portion 13, and the lock bar 10 slides. Stop. Then, as shown by a chain line in FIG. 8, the lock bar 10 protrudes to a position straddling between the door D and the door support frame P, and the door D is locked. In addition, the code | symbol 50 in FIG. 8 is a stopper engaged with the guide long grooves 16 * 16 by the side of the insertion port 18 of the lock bar 10 at the time of this locking.

  On the other hand, when unlocking the door D, the lock bar 10 is slid by the distance of the sliding stroke L in the direction opposite to the arrow direction. That is, the door D is unlocked by sliding the stopper plate 32b of the stopper 32 to a position where the stopper plate 32b abuts against the other end of the protruding rail portion 13 and stops.

  As described above, when the door D is locked and unlocked by reciprocatingly sliding the lock bar 10, if the pinion gear 30 b meshes with the display switching gear portion 20 a of the rack 20 at the same time during the sliding stroke of the lock bar 10, the pinion gear 30 b Is rotated halfway in the forward / reverse direction integrally with the display board 40, and according to the turning direction, the section display surface of the display board 40 facing from the display window 45 is switched, and the locking / unlocking state of the door D is displayed to the outside. The

  Now, in the sliding door lock device of the present invention, when the door D is locked and unlocked by reciprocatingly sliding the lock bar 2 as described above, the pinion gear 30b is disengaged from the display switching gear portion 20a and rotated. When passing over the clearance groove 21c of the restriction groove 21, at the same time, as shown in FIG. 5, the tip engaging part 36b of the guide piece 35 engages with the restriction groove parts 21a and 21b of the rotation restriction groove 21, and that of the pinion gear 30b. The above rotation is regulated by the guide piece 35. Therefore, even if the pinion gear 30b is disengaged from the display switching gear portion 20a, the pinion gear 30b is not affected by the centrifugal force after the rotation. As a result, the display board 40 can switch and display the door locking / unlocking state accurately and accurately from the display window 45 on different semi-circular divided display surfaces.

  On the other hand, in the event of an emergency such as a user falling down in the toilet while the door is locked, an emergency unlocking tool is used from the outside of the door D. The portion is inserted into the middle position of the hollow hole 44a of the display board 40 through the emergency operation hole 41a of the handle B, and the rotary shaft 30 is pushed into the door D against the biasing spring 31, as shown in FIGS. Thus, the pinion gear 30b is meshed with the emergency unlocking gear portion 20b. Then, with the rotary shaft 30 pushed in, the emergency unlocking tool is pushed in the unlocking direction to rotate the pinion gear 30b and sequentially mesh with the display switching gear portion 20a and the emergency unlocking gear portion 20c. However, the door D is unlocked by sliding the lock bar 10 to the unlocking position in the direction of the arrow in the figure.

  Now, also at the time of this emergency unlocking, as for the guide piece 35, the front-end | tip engaging part 36b is engaging with the control groove part 21a of the rotation control groove 21. FIG. However, in the sliding door lock device of the present invention, when emergency unlocking is performed, when the rotary shaft 30 is pushed in and rotated as shown in FIG. 11, the pinion gear 30b is engaged with the emergency unlocking gear portion 20b. Thus, the compression coil spring 34 is compressed in the square hole 33 of the rotating shaft 30, and the guide piece 35 is slightly pulled into the square hole 33 by the compression distance, so that the spring property of the compression coil spring 34 is resisted. Thus, the taper surface t of the tip engaging portion 36b is allowed to rotate while sliding on the groove surface of the restricting groove portion 21a. As a result, at the time of emergency unlocking, even if the guide piece 35 is engaged with the rotation restricting groove 21, if the rotary shaft 30 is pushed, the pinion gear 30b is rotated and the lock bar 10 is easily slid in the unlocking direction. Can be moved.

It is a disassembled perspective view which shows the sliding door lock apparatus of this invention. It is a disassembled perspective view which shows a sliding door lock device in the opposite direction to FIG. It is a top view which shows the inside of the groove part of a lock bar. It is a top view which shows the internal structure of a locking means. It is a longitudinal cross-sectional view which shows a locking means. It is a disassembled perspective view which shows the structure of a rotating shaft. It is an assembly perspective view which shows a locking means. It is a side view which shows a sliding door lock device in a door attachment state. It is a top view which shows the internal structure of the locking means at the time of emergency unlocking. It is a side view which shows the internal structure of the locking means at the time of emergency unlocking. It is a longitudinal cross-sectional view which shows the locking means at the time of emergency unlocking. It is a side view which shows the conventional sliding door lock device in a door attachment state. It is a side view which shows the internal structure of the locking means with which the other conventional sliding door lock apparatus was equipped.

Explanation of symbols

A Locking means B Handle D Door 10 Lock bar 11 Mounting block 20 Rack 20a Display switching gear 20b, 20c Emergency unlocking gear 21 Rotation restricting groove 30 Rotating shaft 30b Pinion gear 31 Energizing spring (urging means)
33 Square hole 34 Compression coil spring 35 Guide piece 36b Tip engagement portion t Tapered surface

Claims (1)

An inner lock means for locking and unlocking the door and an outer handle are fastened with the door interposed therebetween, and a substantially groove-shaped lock bar is slidably engaged with a mounting block provided for the lock means, At the same time as sliding the bar to lock and unlock the door from the inside, the sliding of the lock bar is converted into a rotational motion by a rack and pinion mechanism, and the rotation is transmitted to the display plate attached to the shaft tip of the rotary shaft. In a sliding door lock device that displays a door locking / unlocking state from a display window of the handle by switching different display sections on the display board,
A sliding door lock device comprising the following structural requirements (A), (B), (C), (D), (E) and (F).
(A) The lock bar of the lock means is provided with a rack inward along its longitudinal direction, and the rack is provided on both sides of the gear portion for display switching at the middle portion in the length direction and on the both sides thereof. An emergency unlocking gear provided at a height closer to the bottom of the groove.
(B) The lock bar is provided with a rotation restricting groove parallel to the rack on the bottom surface of the groove, and the rotation restricting groove is formed by a tapered groove provided with a groove surface in a direction in which the groove width gradually narrows in the depth direction. thing.
(C) A pinion gear that meshes with the rack is provided at the base end of the rotating shaft, and the pinion gear is supported by the mounting block so as to be rotatable and movable in the axial direction.
(D) A square hole is drilled in the base end surface of the rotating shaft, and a guide piece having a compression coil spring wound around the square hole is inserted and retracted.
(E) The guide piece is provided with a tip engaging portion that is tapered gradually with a tapered surface corresponding to the tapered groove shape of the rotation restricting groove on the tip side.
(F) The mounting block constantly urges the rotating shaft toward the groove bottom surface of the lock bar by urging means so that the pinion gear meshes with the display switching gear portion of the rack, and the tip of the guide piece Positioning and holding at a position where the engaging portion engages with the rotation restricting groove.

Images