JP3869684B2 - Telescopic member locking device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lock device for restricting the relative movement of an expansion / contraction member composed of one member and the other member connected to each other in a telescopic scaffolding plate, an extendable stepladder, a ladder or the like.
[0002]
[Prior art and problems]
In this type of conventional telescopic member locking device, one member of the telescopic member is provided with a rack, and the other member is provided with a device main body comprising a stopper or the like that is detachably engaged with the rack. However, in the conventional locking device, the structure of the device main body is complicated and the number of parts is large, so that it is difficult to incorporate the device main body into the other member in a compact manner and the manufacturing cost is high. was there.
[0003]
Moreover, there exists a thing described in Unexamined-Japanese-Patent No. 2000-27571 as a conventional locking device of an expansion-contraction member. In this locking device, a rack is provided on one member of the telescopic member, a base frame is attached to the other member, and a stopper that is removably engaged with the rack is pivotally attached to the base frame. In between, a spring that urges the meshing teeth to always mesh with the rack is interposed, and by engaging with a required portion of the stopper by a rotational motion, the stopper meshes with the locking position where the meshing tooth meshes with the rack. A rotating operation body provided with cams for holding the meshing teeth at the unlocking positions where the meshing teeth are separated from the rack against the force is pivotally attached to the frame, and by rotating the rotation operating body, Since the relative movement of the telescopic member is restricted, if a large impact or vibration is applied to the locking device while the work table or the like is being used, the rotating operation body rotates unexpectedly due to the impact or vibration, and the telescopic part There has been a drawback referred to the locked state of the will is released.
[0004]
In view of the above, an object of the present invention is to provide a lock device in which the structure of the device main body is simple and can be compactly incorporated into an extensible member, and the production cost can be reduced. Another object of the present invention is to provide a locking device that prevents the locked state from being easily released even if a large impact or vibration is applied during use.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 is a lock device that restricts relative movement of an expansion / contraction member composed of one member 4 and the other member 5 that are connected to each other so as to be expandable / contractible. The base frame 10 is attached to the other member 5, and the base frame 10 is provided with engaging teeth 11 that are detachably engaged with the rack 9 on one side and a cam 12 is formed on the other side. A stopper 13 is pivotally mounted, and a spring 14 is interposed between the stopper 13 and the frame 10 so that the meshing teeth 11 are always meshed with the rack 9, and extends to the frame 10 in parallel with the telescopic member. The movable shaft 17 is attached so as to be movable in the axial direction and pivotable, and a spring 28 for biasing the movable shaft 17 to one side in the axial direction is interposed between the movable shaft 17 and the frame 10 so that the movable shaft 17 is movable. A cam engagement piece 15 is fixed to a required portion of the shaft 17, and the cam engagement piece 15 A shift lever 16 protruding Luo integrally and engages against the biasing force of the spring 28 to the positioning groove 19 provided on the mount plate 18 which is attached to the other member 5, the cam in this way The cam engaging piece 15 holds the stopper 13 at the locked position where the engaging teeth 11 engage with the rack 9 and the unlocking position where the engaging teeth 11 disengage from the rack 9 against the spring biasing force. Is attached to the underframe 10 so as to be movable by a shift lever 16.
[0006]
According to a second aspect of the present invention, in the locking device for the telescopic member according to the first aspect, the shift lever 16 moves the cam engagement piece 15 only in the extension direction of the one member 4 in addition to the locking position and the unlocking position. It is possible to move to a position that permits the movement.
[0008]
According to a third aspect of the present invention, in the locking device for the telescopic member according to the first aspect , the positioning groove 19 of the mounting base plate 18 communicates with the vertical groove portion a extending parallel to the movable shaft 17 and the vertical groove portion a. a plurality of horizontal groove portions b, c orthogonal to a, the end ao of the vertical groove portion a as the lock position of the shift lever 16, the end bo of one horizontal groove portion b as the unlocking position, The end co of the lateral groove c is a position allowing only the extension direction.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, the case where the locking device according to the present invention is implemented on the telescopic scaffolding plate will be described with reference to the drawings. 1A and 1B are a plan view and a front view of the scaffold plate 1 in the stretched state, and FIGS. 2A and 2B are a plan view and a front view of the scaffold plate 1 in the stretched state. FIG. As can be seen from FIGS. 1 and 2, the telescopic scaffolding plate 1 is composed of a pair of scaffolding plate main bodies 2 and 3, and the respective scaffolding plate main bodies 2 and 3 are arranged at intervals in the scaffolding plate width direction. The scaffolding plate members 4 and 5 are made of an aluminum extrusion mold, and the scaffolding plate member 4 of one scaffolding plate main body 2 is slidably interposed between the scaffolding plate members 5 of the other scaffolding plate main body 3 in the length direction of the scaffolding plate. ing.
[0010]
One end side in the scaffold plate length direction of the scaffold plate member 4 of one scaffold plate body 2 and the other end side in the scaffold plate length direction of the scaffold plate member 5 of the other scaffold plate body 3 are connected to each other by connecting members 6 and 6, respectively. It is connected to. Further, the other end side of the scaffold plate length 4 of the scaffold plate member 4 of one scaffold plate body 2 and the one end side of the scaffold plate length 5 of the scaffold plate member 5 of the other scaffold plate body 3 are all the scaffold plate members 4. , 5 and are connected to each other by a band plate 7 which is externally fitted and supported so as to be slidable in the length direction of the scaffolding plate. Therefore, both the scaffold board main bodies 2 and 3 are relatively movable in the length direction of the scaffold board, and thereby the scaffold board 1 is configured to be stretchable in the length direction.
[0011]
One scaffold plate member 4 (one member of the expansion / contraction member) on one side of the scaffold plate width direction in one scaffold plate body 2 and one end side in the scaffold plate width direction of the other scaffold plate body 3 facing this scaffold plate member 4. The locking device 8 according to the present invention is interposed between the scaffold plate member 5 (the other member of the elastic member). Hereinafter, the locking device 8 will be described with reference to FIGS.
[0012]
FIG. 3A is an enlarged vertical sectional view of a portion surrounded by an arrow A in FIG. 2, showing a state held at the lock position, and FIG. 3B is an enlarged front view of the portion. 4A is an enlarged front view of the scaffold plate member 4 in a state in which only the extension can be extended, FIG. 4B is an enlarged front view of the same portion, and FIG. 5A is held in the unlocked position. The enlarged front view in the state by which it was carried out, (B) is the enlarged front view of the part. As can be seen from FIGS. 3 to 5, one scaffolding plate member 4 is provided with a rack 9 in the length direction, and the other scaffolding plate member 5 is attached with a frame 10. A stopper 13 having a meshing tooth 11 that engages and disengages with the rack 9 is provided on one side and a cam 12 is formed on the other side. A stopper 13 is pivotally mounted on the other side. A W-shaped kick spring 14 that biases the meshing teeth 11 so as to always mesh with the rack 9 is interposed therebetween. Further, the frame 10 is engaged with the cam 12 of the stopper 13, and the stopper 13 is engaged with the lock position (see FIG. 3) where the meshing teeth 11 mesh with the rack 9, and the extension direction of one scaffold plate member 4. Cam engaging pieces 15 for holding in a position allowing only movement (see FIG. 4) and a lock releasing position (see FIG. 5) where the meshing teeth 11 are disengaged from the rack 9 against the biasing force of the spring 14. However, the shift lever 16 is attached so as to be movable in the linear direction.
[0013]
The structure of the locking device 8 will be described in more detail. A movable shaft 17 extending parallel to the scaffolding plate members 4 and 5 is attached to the underframe 10 so as to be movable in the axial direction and to be rotatable around the axis. A compression coil spring 28 for biasing the movable shaft 17 in one direction is interposed between the movable shaft 17 and the base frame 10, and a cam engagement piece 15 is fixed to a required portion of the movable shaft 17, and the cam A shift lever 16 is integrally provided on the engagement piece 15 so as to project in a direction perpendicular to the movable shaft 17. The shift lever 16 is engaged with the positioning groove 19 of the mounting base plate 18 attached to the scaffold plate member 5 against the urging force of the spring 28.
[0014]
The positioning groove 19 is formed through the mounting base plate 18 and has a plurality of vertical and horizontal lines that communicate with each other for positioning the shift lever 16 at three positions: the lock position, a position that allows only the extension direction, and a lock release position. The vertical groove portion a is a groove portion extending in parallel with the axial direction of the movable shaft 17, and the cam engaging piece is set by setting the shift lever 16 at the end ao of the vertical groove portion a. 15 is held in the locked position. The lateral groove portions b and c are groove portions orthogonal to the longitudinal groove portion a. By setting the shift lever 16 at the end portion bo of the lateral groove portion b, the cam engagement piece 15 is allowed to move only in the extending direction. The cam engaging piece 15 is held at the unlocked position by setting the shift lever 16 at the end co of the lateral groove b.
[0015]
In addition, “lock” is displayed at the position where the shift lever 16 is set so that the cam engagement piece 15 is held in the locked position, and the cam engagement piece 15 is only in the extending direction of the scaffold plate member 4. “Extend” is displayed at the position where the shift lever 16 is set so as to be held at the allowable position, and the shift lever 16 is set at a position where the cam engagement piece 15 is held at the unlocked position. Is displayed as "free". Thus, by displaying the characters “lock”, “stretch” and “free” at predetermined positions, the shift lever can be positioned quickly and easily.
[0016]
FIGS. 6 to 12 show the assembly procedure of the locking device 8, and in the assembly process, first, as shown in FIGS. 6A and 6B, the W-shaped kick spring 14 is set on the stopper 13, The stopper 13 is inserted into the underframe 10 from below, and the state shown in FIG.
[0017]
The frame 10 includes a pair of side plates 20 and 20, an upper plate 21 that connects the upper ends of the side plates 20 and 20, and a flange portion 22 that protrudes outward from the lower ends of the side plates 20 and 20. , 22 are provided with end plates 23, 23 at both left and right ends of the frame body 10a. Openings 21a, 21b are provided in the upper plate 21 of the frame body 10a, and each side plate 20 has a lower portion thereof. A bulging portion 20a is formed on the side, a pin insertion hole 20b is provided above the bulging portion 20a, and each end plate 23 is provided with a movable shaft insertion hole 23a. The stopper 13 is provided with a pin insertion hole 13a.
[0018]
After the stopper 13 is inserted into the frame 10 as shown in FIG. 7A, the pin insertion hole 20b on the stopper 13 side extends from the pin insertion hole 20b on the frame 10 side as shown in FIG. 7B. The stopper pivot pin 24 is inserted over 13a, and the stopper ring 25 is set at the insertion end of the pin 24, whereby the stopper 13 is pivotally mounted on the frame 10, and the meshing tooth 11 of the stopper 13 is mounted on the base plate 10. It is set as the state biased so that it may always protrude from the opening part 21a of the frame 10 to the upper direction.
[0019]
Next, as shown in FIG. 8, the movable shaft 17 with the stop ring 26 set at one end is inserted into the frame 10 through the compression coil spring 28 and further through the movable shaft insertion hole 23 a of the end plate 23. The movable shaft 17 is inserted into the insertion hole 15a of the cam engagement piece 15 in the frame 10, and the cam engagement piece 15 is fixed integrally to a required position of the movable shaft 17 by the stop rings 27 and 27, and the cam The tip end portion of the shift lever 16 projecting from the engagement piece 15 is projected from the lower end of the underframe 10 to obtain a state as shown in FIG. At this time, the movable shaft 17 is biased by the compression coil spring 28 toward one end side (left side in FIG. 9), so that the cam engagement piece 15 on the movable shaft 17 is actually the frame 10. Although it is in a position close to the left end in FIG. 9, it is shown in a state where it is held at an intermediate position in the left-right direction in the frame 10 against the biasing force of the spring 28.
[0020]
Thereafter, as shown in FIG. 9, the mounting base plate 18 is attached to the flange portion 22 of the frame body 10a with screws 33 (see FIGS. 3 to 5), and the shift lever 16 protruding from the cam engagement piece 15 is attached. A state in which the mounting plate 18 is engaged with the positioning groove 19 of the base plate 18 against the urging force of the compression coil spring 28 and the mounting base plate 18 is thus attached to the base frame 10 is shown in phantom lines in FIGS. FIG. 10 is a floor view of the mounting base plate 18 and shows a positioning groove 19 formed through the mounting base plate 18. As can be seen from FIGS. 9 and 10, the mounting base plate 18 is provided with concave steps 29 at the four corners of the bottom surface, and each concave step 29 is provided with a screw insertion hole 30.
[0021]
As shown in FIGS. 3 to 5, the frame 10 having the mounting base plate 18 attached to the lower end portion thereof is inserted into the inside of the opening 31 provided in the required portion of the scaffolding plate member 5 as shown in FIG. The screws 32 may be screwed and fixed to the scaffold plate member 5 through the screw insertion holes 30 of the recessed step portions 29 at the four corners of the base plate 18.
[0022]
When adjusting the length of the telescopic scaffolding plate 1 having the lock device 8 configured as described above, the shift lever 16 is slid along the positioning groove 19 of the mounting base plate 18 and the shift lever 16 is moved. As shown in FIG. 5B, the cam engagement piece 15 is engaged with one end portion 12c of the cam 12 formed on the stopper 13 by setting it at the position where the characters “free” are displayed. Thus, the stopper 13 is held in an unlocked position so that the meshing teeth 11 can be detached from the rack 9 and immersed in the opening 21a of the underframe 10, so that one scaffold plate member 4 is attached to the other scaffold plate member 5. On the other hand, it can be freely expanded and contracted, so that one scaffolding plate body 2 can be expanded and contracted with respect to the other scaffolding plate body 3.
[0023]
After the stopper 13 is held in the unlocked position and the length of the scaffolding plate main bodies 2 and 3 of the telescopic scaffolding plate 1 is adjustable, the shift lever 16 is moved along the positioning groove 19. Slide and set from the “free” display position set until then to the “lock” display position as shown in FIG. In the operation in this case, the shift lever 16 that has been set at the “free” display position (the end co of the lateral groove c that is the unlocking position) is required around the movable shaft 17 along the lateral groove c. When the angle pivots and the end portion co of the lateral groove portion c returns to the longitudinal groove portion a, the shift lever 16 is pulled along the longitudinal groove portion a by the urging force of the spring 28 acting on the movable shaft 17, and the end portion ao. It is automatically set to the lock position, which is the display position of “lock” located at.
[0024]
By setting the shift lever 16 at the display position of the positioning groove 19 “lock” as described above, the cam engagement piece 15 is engaged with the other end portion 12a of the cam 12, and the stopper 13 thereby has its meshing teeth. 11 is held in a locked position where it meshes with the rack 9, and one scaffold plate member 4 is fixed so as not to move relative to the other scaffold plate members 4 and 5, so that one scaffold plate body 2 is fixed to the other scaffold plate body. 3 is fixed to be immovable.
[0025]
Further, the shift lever 16 is slid along the positioning groove 19 and set to the “extend” display position as shown in FIG. 4B, so that the cam engagement piece 15 is connected to the one end 12 c of the cam 12. The stopper 13 is located in an intermediate portion with the other end portion 12a, and the engaging tooth 11 is merely engaged with the rack 9 by the urging force of the spring 28. However, one scaffold plate member 4 is shown in FIG. Movement in the left direction, that is, movement in the extension direction is possible, and movement in the right direction in FIG. Therefore, in this state, one scaffold board body 2 can only move in the extension direction with respect to the other scaffold board body 3.
[0026]
As described above, when the shift lever 16 is shifted from the “lock” display position of the positioning groove 19 to the “extend” display position, the “lock” display position (the end of the vertical groove a which is the lock position) is changed. The shift lever 16 set in ao) is slightly slid along the longitudinal groove a toward the other end side against the biasing force of the spring 28, and then the required angle around the movable shaft 17 along the lateral groove b. What is necessary is just to rotate and push in into the edge part bo of the horizontal groove part b.
[0027]
As described above, this locking device 8 is provided with a rack 9 on the scaffold plate member 4 of one scaffold plate body 2 constituting the telescopic scaffold plate 1, and a frame 10 on the scaffold plate member 5 of the other scaffold plate body 3. A stopper 13 having a meshing tooth 11 that is detachably meshed with the rack 9 and projecting on one side and a cam 12 formed on the other side is pivotally attached to the frame 10. A spring 14 is interposed between the base frame 10 and the meshing teeth 11 so that the meshing teeth 11 always mesh with the rack 9, and is engaged with the cam 12 to lock the stopper 13 with the meshing teeth 11. A cam engagement piece 15 is held on the frame 10 so as to be movable by a shift lever 16. The cam engagement piece 15 is held at the unlocked position where the meshing teeth 11 are separated from the rack 9 against the position and the spring 14 biasing force. From the shift lever 16 A cam engaging piece 15 by moving the operation in a linear direction can be restricted reliably expansion and contraction of the scaffold board 1 at any position Te.
[0028]
In particular, in this locking device 8, since the cam 12 for holding the stopper 13 in the locked position and the unlocked position is formed on the stopper 13 itself, the number of parts of the locking device main body is reduced, and the scaffold plate In addition to being compactly incorporated into the member, the manufacturing cost can be reduced.
[0029]
Further, the shift lever 16 can be operated to move the cam engagement piece 15 not only at the locked position and the unlocked position but also at a position allowing only the movement of the scaffold plate member 4 in the extending direction. By setting the shift lever 16 at a position that allows only the scaffold plate member 4, the scaffold plate member 4 can be easily extended.
[0030]
Further, in this locking device 8, a movable shaft 17 extending parallel to the scaffolding plate members 4 and 5 is attached to the underframe 10 so as to be movable in the axial direction and rotatable about the axis, and the movable shaft 17 is axially mounted. A spring 28 biased to one side of the movable shaft 17 is interposed between the movable shaft 17 and the base frame 10, and a cam engagement piece 15 is fixed to a required portion of the movable shaft 17. The shift lever 16 protruding in the position is engaged with the positioning groove 19 of the mounting base plate 18 attached to the scaffold plate member 5 against the urging force of the compression coil spring 28. The shift switching operation of the cam engagement piece 15 by the shift lever 16 to a position that permits only the movement in the extension direction or only the extension direction can be easily and quickly performed, and the urging force of the compression coil spring 28 allows the lock position and lock. The holding force of the shift lever 16 at the removal position and the position that allows only the movement in the extension direction becomes strong, so that the stopper 13 can be securely held at each position, and each position is caused by the impact or vibration applied to the scaffold plate 1. There is no risk of accidental switching.
[0031]
In particular, when the shift lever 16 is engaged with the locking position of the positioning groove 19 (the end ao of the vertical groove portion a), the shift lever 16 is displaced in the direction away from the lock position due to vibration or impact, and the unlocked state. Even when the shift lever 16 is approached, the biasing force toward the lock position by the compression coil spring 28 acts on the shift lever 16, so that the shift lever 16 is pulled back to the lock position by the spring biasing force and the unlocking is prevented. This ensures work safety.
[0032]
The locking device 8 applied to the elastic members of the elastic scaffolding plate 1, that is, the scaffolding plate members 4 and 5 connected to each other so as to expand and contract, has been described. The locking device 8 is a stepladder 33 as schematically shown in FIG. It can be applied to an expansion / contraction member (or an expansion / contraction ladder), that is, an expansion / contraction member composed of any one of the leg column members 34a and the other leg column member 34b that are connected to each other so as to be extensible / contractable. .
[0033]
【The invention's effect】
In the locking device according to the first aspect of the present invention, a rack is provided on one member of the telescopic member, a base frame is attached to the other member, and a meshing tooth that meshes with the rack is provided on one side of the base frame. In addition, a stopper having a cam formed on the other side is pivotally mounted, and a spring is interposed between the stopper and the base frame so that the meshing teeth are always meshed with the rack, and the cam is engaged with the cam. A cam engaging piece that holds the stopper in the locked position where the meshing teeth mesh with the rack and the unlocking position where the meshing teeth separate from the rack against the spring biasing force is attached to the frame so that it can be moved by the shift lever. Therefore, the relative movement of the telescopic member can be reliably restricted at an arbitrary position by moving the cam engaging piece in the linear direction with the shift lever. Further, in this locking device, since the cam for holding the stopper in the locked position and the unlocking position is formed on the stopper itself, the number of parts of the locking device main body portion is reduced, and the scaffold plate member is compact. It can be built in and the production cost can be reduced.
Further, according to the present invention, the movable shaft extending in parallel with the telescopic member is attached to the underframe so as to be movable in the axial direction and rotatable, and the spring for biasing the movable shaft toward one side in the axial direction is provided with the movable shaft and the base. Positioning of the mounting base plate, which is interposed between the frame, the cam engaging piece is fixed to the required portion of the movable shaft, and the shift lever protruding integrally from the cam engaging piece is attached to the other member. Since it is engaged with the groove against the biasing force of the spring, the shift switching operation of the cam engagement piece by the shift lever to the lock position and the lock release position can be easily and quickly performed, and The urging force of the spring increases the holding force of the shift lever at the locked position and unlocked position, so that the stopper can be securely held at each position, and each position is unpredictable due to the impact or vibration applied to the elastic member. There is no possibility to switch. In particular, when the shift lever is engaged with the lock position of the positioning groove, even if the shift lever is displaced from the lock position due to vibration or shock and enters the unlocked state, the shift lever is moved to the lock position side. Since the spring urging force acts, the shift lever is pulled back to the lock position by the spring urging force and the unlocking is prevented, thereby ensuring work safety.
[0034]
According to the second aspect of the invention, the shift lever allows the cam engagement piece to be moved to a position that allows only the movement of the one member in the extending direction in addition to the lock position and the lock release position. By setting the shift lever at a position that allows only the extension, the extension operation of the scaffold plate member can be easily performed.
[0036]
According to the invention of claim 3 , the positioning groove of the mounting base plate is composed of a longitudinal groove portion extending in parallel with the movable shaft, and a plurality of transverse groove portions that communicate with the longitudinal groove portion and are orthogonal to the longitudinal groove portion. The end of the vertical groove is the shift lever lock position, the end of one horizontal groove is the unlocking position, and the end of the other horizontal groove is the position allowing only the extension direction. The shift switching operation of the cam engagement piece by the lever can be performed quickly and easily, and the holding force of the shift lever is effectively exerted at the lock position. In particular, the lock release position (at the horizontal groove portion) from the lock position (at the vertical groove portion). ) Are orthogonal to each other, so that the shift lever does not slide from the locked position to the unlocked position due to impact or vibration, and can be used very safely.
[Brief description of the drawings]
FIGS. 1A and 1B are a plan view and a front view, respectively, in a contracted state of an extensible scaffolding board provided with a locking device according to the present invention.
FIGS. 2A and 2B are a plan view and a front view, respectively, of the stretchable scaffold board in an extended state.
3A is an enlarged longitudinal sectional view of a portion surrounded by an arrow A in FIG. 2, and shows the locking device held at the locking position, and FIG. 3B is a view of the locking device viewed from the mounting base plate side. FIG.
4A is an enlarged longitudinal sectional view of a portion surrounded by an arrow A in FIG. 2, and shows a locking device in a state in which the elastic member can only be extended, and FIG. 4B is a mounting base for the locking device. It is the front view seen from the board side.
5A is an enlarged longitudinal sectional view of a portion surrounded by an arrow A in FIG. 2 and shows the locking device held at the unlocking position, and FIG. 5B shows the locking device from the mounting base plate side. FIG.
6A is a front view showing a state in which a stopper is inserted into the frame, and FIG. 6B is a side view thereof.
7A is a front view showing a state in which the stopper has been inserted into the frame, and FIG. 7B is a side view showing the state in which a pin for wearing the stopper pivot is inserted.
FIG. 8 is an exploded view showing a state in which a movable shaft, a compression coil spring, a frame, and a cam engaging piece with a shift lever are assembled to each other.
FIG. 9 is a front view showing a state in which an attachment base plate is to be attached to the lower end portion of the underframe.
FIG. 10 is a bottom view of the mounting base plate.
FIG. 11 is a front view of the locking device main body.
FIG. 12 is a bottom view of the locking device main body.
FIG. 13 is a side view of the locking device main body.
FIG. 14 is a side view of a stepladder provided with a locking device according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Telescopic scaffolding plates 4 and 5 Scaffolding plate member 8 Locking device 9 Rack 10 Base frame 11 Engagement tooth 12 Cam 13 Stopper 14 Compression coil spring 15 Cam engagement piece 16 Shift lever 17 Movable shaft 18 Mounting base plate 19 Positioning groove a Positioning groove Vertical groove ao Vertical groove end b Positioning groove horizontal groove bo Horizontal groove end c Positioning groove horizontal groove co Horizontal groove end

Claims (3)

A locking device that restricts relative movement of an elastic member composed of one member and the other member that are connected to each other so as to be extendable and contractable, wherein a rack is provided on one member, and a frame is attached to the other member, The base frame is fitted with a stopper that engages with the rack in a detachable manner on one side and a cam formed on the other side, and the meshing tooth is located between the stopper and the base frame. A spring that constantly urges the rack to mesh is interposed, and a movable shaft that extends parallel to the telescopic member is attached to the frame so as to be movable in the axial direction and turnable. An urging spring is interposed between the movable shaft and the frame, a cam engagement piece is fixed to a required portion of the movable shaft, and a shift lever protruding integrally from the cam engagement piece is connected to the other lever. The biasing force of the spring in the positioning groove provided in the mounting base plate attached to the member Anti together to engaged, husband and an unlocked position where engaging teeth thus meshed teeth stopper engaged with the cam is against the locked position and the spring bias which meshes with the rack is disengaged from the rack s A locking device for a telescopic member in which a cam engaging piece to be held is attached to a frame so as to be movable by a shift lever.   2. The telescopic member locking device according to claim 1, wherein the shift lever is operable to move the cam engaging piece to a position allowing only the movement of the one member in the extending direction in addition to the locking position and the unlocking position. . The positioning groove of the mounting base plate is composed of a vertical groove extending parallel to the movable shaft and a plurality of horizontal grooves communicating with the vertical groove and orthogonal to the vertical groove, and the end of the vertical groove is locked to the shift lever. 2. The expansion / contraction member locking device according to claim 1 , wherein the position of the one side groove portion is set as a lock release position, and the other side groove portion is set as a position allowing only the extension direction.

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