JPH0317047Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a locking device that locks the outer shaft and the inner shaft at any insertion position in an extensible shaft-like body in which the inner shaft is telescopically inserted into the outer shaft. This invention relates to something that can be effectively applied to a telescopic axis-like body that can be constructed between a ceiling surface and a floor surface.

As shown in FIG. 1, in the conventional construction shaft-like body as described above, an inner shaft 3 is inserted into and fitted into an outer shaft 2 so as to be freely inserted into and removed from the outer shaft 2, and one end portions 2a and 3a spaced apart from each other are inserted into and fitted into an outer shaft 2. The rubber pads 4 and 5 against the vertical walls 1a and 1b are fitted, and a coil spring 6 is arranged inside the outer shaft 2 along its longitudinal direction, and one end of the coil spring 6 is attached to the outer shaft 2.
It is known that a pin 7 is engaged with the one end 2a of the inner shaft 3, and a pin 8 fixed to the other end 3b of the inner shaft 3 is engaged with the coil spring 6. In use, after adjusting the length of the inner shaft 3 to be slightly longer than the distance between the vertical walls 1a and 1b as shown by the imaginary line by turning the inner shaft 3, the inner shaft 3 is rotated against the biasing force of the coil spring 6. is pushed in and the whole is inserted between the vertical walls 1a, 1b, and the shaft-like body is fixed by the frictional force between the vertical walls 1a, 1b and the padding rubbers 4, 5 due to the elastic repulsive force of the coil spring 6. However, with such a configuration, the inner shaft must be rotated many times to adjust the length according to the distance between the vertical walls 1a and 1b.
It is very time consuming, and as the distance between the vertical walls 1a and 1b increases, the distance between the pins 7 and 8, that is, the effective length of the coil spring 6 increases, and if the pushing length of the inner shaft 3 is kept constant, the elastic repulsion force increases. is small, and only a small fixing force can be obtained, and since it is fixed by the pushing repulsion force of the inner shaft 3, a large force is required to attach the axis-like body, and the fixing force is small, and the actual loading capacity is only about 5 kg. The problem is that you can't get it.

In order to solve these problems, as shown in FIGS. 2 and 3, a rod is provided that is slidable from the other end 3b of the inner shaft 3 in the axial direction in the extending direction and is not relatively rotatable. 9 is extended, and a lock portion 10 is attached to the tip of the lock portion 9.
Attach this lock portion 10 and the other end portion 3b of the inner shaft 3.
A compression spring 11 is interposed between the lock part 1 and the lock part 1.
0, an annular groove 13 whose bottom surface is formed into a spiral cam surface 14 is formed on the outer periphery of the shaft portion 12 that fits loosely into the outer shaft 2, and the annular groove 13 engages with the inner surface of the outer shaft 2. A split ring 15 has been proposed in which a split ring 15 is fitted which has a biasing force for diameter expansion and has a protrusion 16 protruding from the inner periphery of one end in the circumferential direction to engage with the cam surface. When in use, after pulling out the inner shaft 3 so that it is slightly longer than the distance between the vertical walls 1a and 1b, the inner shaft 3 is rotated to rotate the shaft portion 12, and the protrusion 16 of the split ring 15 is rotated. The outer shaft 2 and the shaft portion 12 are engaged with each other via the split ring 15 to fix the lock portion 10, and then the inner shaft 3 is moved against the biasing force of the compression spring 11. is inserted between the vertical walls 1a and 1b. According to such a configuration, the length of the shaft-like body can be easily adjusted and the effective length of the compression spring 11 remains unchanged regardless of its length, but since it is fixed by the pushing repulsion force of the inner shaft 3, the force is reduced. In addition, the locking portion 10 is configured to press two diametrically narrow portions of the narrow split ring 15 against the inner surface of the outer shaft 3 at the cam surface 14 by rotating the shaft portion 12, so that a large amount of fixation is required. There are problems in that it does not provide enough force, and due to its structure, it can only be applied to objects with a fairly large outer diameter.

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the conventional locking section, an object of the present invention is to provide a locking device of an extensible shaft-like body that can obtain a large fixing force with a simple operation.

Therefore, in the present invention, the inner shaft 22 is inserted into the outer shaft 21 so as to be freely drawn out, and a threaded shaft 33 is attached to the center of the end of the inner shaft 22 inserted into the outer shaft 21.
22, and a cylindrical cam body 35 formed with a cam surface 36 whose end face is inclined with respect to the axis is loosely fitted onto the threaded shaft 33 so as to be eccentrically movable in the radial direction, The cam surface 3 of the cam body 35 is attached to one end surface.
A locking cam body 38 is attached to the cylindrical cam body 35, which has a cam surface 39 facing 6 and a locking portion 40 in elastic sliding contact with the inner surface of the outer shaft 21 at the other end.
The threaded shaft 33 is screwed into one of the locking cam body 38 and the end of the inner shaft 22, and the threaded shaft 33 is screwed into the other end.
A blade 43 is provided on the outer periphery of a cylindrical cam body 35 whose shaft end is fixed and is brought into contact with the inner surface of the outer shaft. Abutting bodies 24, 24 for the wall surface are provided at mutually separated ends of the inner shaft 22 and the outer shaft 21 or the inner shaft 2.
2 is interposed with a pressing rotary body 25 that advances the corresponding contact body 24 in the direction of the wall surface by rotation. After the contact body 24 is brought into contact with the opposing wall surface, the locking cam body 38 is brought into contact with the cylindrical cam body 35 by relatively rotating the outer shaft 21 and the inner shaft 22, and the cylindrical cam body 35 is rotated. After the blade 43 protruding from the outer circumferential surface is pressed against the inner surface of the outer shaft 21 by eccentrically moving in the radial direction, the pressing rotary member 25 is moved eccentrically in the radial direction.
An extensible shaft-like body configured so that when the contact body 24 is pressed against a wall surface by rotating the blade 43, the blade 43 bites into the inner circumferential surface of the outer shaft 21 and is firmly locked. Provides locking devices for

Hereinafter, an embodiment in which the present invention is applied to the above-mentioned erected shaft-like body will be described based on FIGS. 4 to 12.
Reference numeral 21 denotes an outer shaft made of a pipe coated with a synthetic resin, and an inner shaft 22 made of a pipe coated with a synthetic resin is inserted into and removably inserted into the outer shaft 21. Reference numeral 23 denotes a synthetic resin bearing that is press-fitted into one end 21a of the outer shaft 21 on the insertion side of the inner shaft 22, and holds the inner shaft 22 in a slidable manner. 24 is the other end 2 of the outer shaft 21 and the inner shaft 22 that are spaced apart from each other.
1b and 22b, which are in contact with the wall surface and are swingable within a certain range, and on the contact surface with the wall surface, there is a pressing plate 24a made of elastic material such as rubber and having a large coefficient of friction. It is glued. Reference numeral 25 denotes a pressing rotating body screwed onto the other end 22b of the inner shaft 22 so as to be movable in the axial direction, and the abutting body 24 on the inner shaft 22 side is attached to this pressing rotating body 25 with screws 24b. ing. This pressing rotary body 25 has an inner shaft 22.
The head 26a of the bolt 26 extending to the side is concentrically embedded. Reference numeral 27 denotes a rotary operation cylinder externally fitted and fixed to the other end of the inner shaft 22, and an end plate portion 27a that engages with the other end of the inner shaft 22 is provided with a through hole 27b for the bolt 26. A nut 28 into which the bolt 26 is screwed is integrally buried. Reference numeral 27c denotes a rotation prevention protrusion protruding from the inner periphery of the rotary operation cylinder 27, and a cutout groove 2 formed at the other end 22b of the inner shaft 22.
9 is fitted and engaged. Reference numeral 30 denotes a mounting member for the contact body 24 which is externally fitted and fixed to the other end 21b of the outer shaft 21, and has the same structure as that of the externally fitted and fixed rotary operation cylinder 27 to the other end 22b of the inner shaft 22. Fixed externally. Reference numeral 31 denotes a locking device interposed between one end 22a of the inner shaft 22 and the inner surface of the outer shaft 21 at its extended position, and is configured so that the outer shaft 21 and the inner shaft 22 can be fixed at any position where the inner shaft is inserted. has been done. That is, a nut member 32 is fitted and fixed to one end 22a of the inner shaft 22, a bolt 33 is screwed into this nut member 32 from the outside of the inner shaft 22, and the tip 33b
It is caulked so that it cannot slip out. A cylindrical cam body 35 is fitted onto this bolt 33 and has a cam surface 36 whose end surface opposite to the nut member 32 is inclined with respect to the axis, and whose side surface on the side of the nut member 22 is inclined toward the axis. The nut member 32 is in contact with the nut member 32 via a washer 34. This cylindrical cam body 3
The through hole 37 of the bolt 33 of No. 5 is formed to have an oval cross section or a large diameter so that the cylindrical cam body 35 can be displaced eccentrically. Head 33 of the bolt 33
a has a cam surface 39 corresponding to the cam surface 36 of the cylindrical cam body 35, and has a locking portion 40 on the opposite side of the cylindrical cam body 35 that elastically engages with the inner surface of the outer shaft 21. A locking cam body 38 is fixed. The fixing structure of the locking cam body 38 and the bolt 33 is such that the bolt 33 passes through the main body 38a of the locking cam body 38, and the head 33a of the bolt 33 penetrates into the hexagonal hole of the main body 38a.
8b and is fixed together with adhesive or caulking to prevent it from slipping out. Note that the head 33a of the bolt 33 may be embedded integrally in the locking cam body 38. Further, the locking portion 40 includes a cylindrical portion 41 extending from the main body portion 38a of the locking cam body 38.
A thick large diameter portion 41a is formed at the tip of the cylindrical portion 41, and axial cuts 42 are made at multiple locations in the circumferential direction of the cylindrical portion 41. The outer surface of the shaft 41a is configured to come into pressure contact with the inner surface of the outer shaft 21. Furthermore, the cylindrical cam body 3
The outer peripheral surfaces of the locking cam body 5 and the locking cam body 38 are approximately cylindrical, but more precisely, by bringing the cam bodies 35 and 38 closer to each other, their cam surfaces 36 and 39 abut each other and move eccentrically relative to each other. The area of approximately 120 degrees on the side that comes into contact with the inner surface of the outer shaft 21 is the outer shaft 21.
The radius of these cam bodies 35, 3 is set to be approximately the same as or slightly larger than the radius _R0 of the inner surface.
The contact area with the inner surface of the outer shaft 21 during the eccentric movement of the cam body 8 is increased, and the remaining area is set relative to the inner diameter of the outer shaft 21 so that these cam bodies 35 and 38 can slide smoothly inside the outer shaft 21. It is set to a fairly small diameter. Further, the outer shaft 21 on the outer peripheral surface of the cylindrical cam body 35
A groove 44 is cut into the part that contacts the inner surface at an angle in the insertion direction of the inner shaft 22, and the groove 44 has a thickness smaller than the width of the groove T, preferably about half of the width of the groove T. The arcuate blade 43 of the blade 43 is fitted loosely, and the tip 43a of this blade 43 is connected to the cylindrical cam body 35.
It protrudes slightly from the outer peripheral surface of. Note that the blade 43 can be provided on the locking cam body 38 side, but since the cylindrical cam body 35 can move more eccentrically due to the through hole 37, even if the blade 43 is provided, it will not slide. This is preferable since there is no risk of accidental engagement with the inner surface of the outer shaft 21.

In the above configuration, in order to construct the shaft-like body 20 between the vertical walls 1a and 1b, first place the shaft-like body 20 at a desired position between the vertical walls 1a and 1b as shown in FIG. 12a. Then, when the contact body 24 of the other end 21b of the outer shaft 21 is brought into contact with the vertical wall 1a and the inner shaft 22 is pulled out from the outer shaft 21, a screw shaft 33 provided at the end of the inner shaft 22 is inserted. The locking cam body 35 moves integrally with the outer circumferential surface of the locking portion 40 in sliding contact with the inner surface of the outer shaft 21. At this time, the locking portion 40 of the locking cam body 35 is formed by dividing the cylindrical portion 41 facing opposite to the pulling direction into a plurality of parts from the end surface by the cut 42, so that the locking portion 40 of the locking cam body 35 is axis 22
When the inner shaft 22 is pulled out, the inner shaft 22 can be easily pulled out by performing an action of contracting in the radial direction. In this way, the inner shaft 22 is pulled out and the contact body 24 attached to the outer end of the pressing rotary body 25 is brought close to or in contact with the vertical wall 1b. Next, as shown in FIG. 12b, when the inner shaft 22 is rotated in the direction of the arrow by the rotary operation cylinder 27, the locking cam body 38 is pressed against the inner surface of the outer shaft 21 and stopped, so that the screw shaft 33 and the nut member 32, the inner shaft 22 locks into the locking cam body 3.
8 side, and the cylindrical cam body 35 is inserted through the washer 34.
moves closer to the locking cam body 38. At this time, the rotation of the cylindrical cam body 35 is prevented by the ratio of its cam surface 36 to the cam surface 39 of the locking cam body 38, and the cylindrical cam body 35 slides on the cam surface due to the abutment between these cam surfaces 36 and 39. The blade 43 fixed to the outer circumferential surface of the inner shaft 21 is brought into pressure contact with the inner surface of the outer shaft 21, and the inner shaft 22 is prevented from moving in the direction of contraction while the inner shaft 22 is pulled out to a desired length. In particular, since the blades 43 are inclined outward in the insertion direction of the inner shaft 22, when the inner shaft 22 attempts to contract, the blades 43 bite into the inner peripheral surface of the outer shaft 21, preventing movement in the contraction direction. It is something that is prevented. In this way, the outer shaft 21 and the inner shaft 22 are firmly fixed via the cam bodies 35, 38, the bolt 33, and the nut member 32. Incidentally, eccentric movement of the locking cam body 38 is allowed by the gap between the threaded portion of the bolt 33 and the nut member 32, and eccentric movement of the cylindrical cam body 35 is allowed by the large diameter through hole 37. Thereafter, as shown in FIG. 12c, the pressing rotary body 25 is rotated in the direction of the arrow.
5 toward the vertical wall 1b, the abutting body 24 is strongly pressed against the vertical wall 1b, and the axis-like body 20 is firmly constructed between the vertical walls 1a and 1b. At that time, the reaction force of the pressing force causes the outer shaft 21 to
When a force is applied that causes the inner shaft 22 to be inserted into the locking device, and the locking device 31 attempts to slightly displace toward the other end 21b of the outer shaft 21, the blade 43 is loosely engaged with the groove 44, so that the locking device 31 stands upright. As it goes up, it bites into the inner surface of the outer shaft 21 more firmly, so that the locking device 31 is firmly fixed to the inner surface of the outer shaft 21 with a force corresponding to the pressing force by the pressing rotary body 25. In this way, by pressing the contact body 24 against the vertical walls 1a, 1b using the screw mechanism, the operation is extremely simple and a strong fixing force can be obtained.
The loading capacity can be improved five times or more compared to the conventional one, and the locking device 31 can sufficiently withstand the large pressing force required for this purpose.

The shaft-like body 20 installed between the vertical walls 1a and 1b in this way can be used as a hanger or drying rack, as shown in FIG. 13, or as a rail for hanging curtains or partitions, as shown in FIG. It can be used for a variety of purposes.

In the above embodiment, the bolts 26 and 33 are twisted in the same direction, so the direction of rotation of the inner shaft 22 and the direction of rotation of the rotary pressing body 25 are opposite. They can be rotated in the same direction. Also, lock the bolt 33 on the cam body 3.
8, and a nut member 32 is provided on the inner shaft 22 side, but conversely, a bolt 33 is provided on the inner shaft 22 side.
The locking cam body 38 may be displaceably mounted and a nut member may be provided on the locking cam body 38. Further, the shape of the blade 43 is not limited to that of the embodiment, and may be a plate having a plurality of blades, for example.

In addition, the locking device of the present invention can be applied not only to an erected axoid but also to various extensible axoids in which an inner shaft is inserted into an outer shaft, and is applicable not only to a single axoid but also to structures in which axoids are combined. It can also be applied to objects.

According to the extendable shaft-like locking device of the present invention, as is clear from the above description, the inner shaft 22 is inserted and fitted into the outer shaft 21 so as to be freely drawn out, and the outer shaft 21
A threaded shaft 33 is disposed at the center of the end of the inner shaft 22 inserted therein in the axial direction of the inner and outer shafts 21 and 22, and a cam surface 36 whose end surface is inclined with respect to the shaft center is provided on the threaded shaft 33.
A cylindrical cam body 35 formed in the cylindrical cam body 35 is loosely fitted in the cylindrical cam body 35 so as to be eccentrically movable in the radial direction.
The locking cam body 38 has a cam surface 39 opposite to the cam surface 36 of the outer shaft 21 and a locking portion 40 in elastic sliding contact with the inner surface of the outer shaft 21 at the other end thereof. disposed within the outer shaft 21 in close proximity to the body 35;
The threaded shaft 33 is screwed into one of the locking cam body 38 and the end of the inner shaft 22, and the shaft end of the threaded shaft 33 is fixed to the other, and the cylindrical shape is brought into contact with the inner surface of the outer shaft. Since a blade 43 is provided on the outer periphery of the cam body 35 and is inclined outward in the direction of insertion of the inner shaft 22, when the inner shaft 22 is pulled out, both cam bodies 35, 38 are cut through the threaded shaft 33. are maintained at a constant interval, and the blade 43 protruding from the outer circumferential surface of the cylindrical cam body 35 can be smoothly pulled out without coming into pressure contact with the inner circumferential surface of the outer shaft 21.

After further pulling out the desired length, the inner and outer shafts 21,
22 by grasping any part of these shafts 21, 22.
By relatively rotating the locking cam body 3
8 is drawn toward the cylindrical cam body 35 via the screw shaft 33, causing the cam surfaces of both cam bodies 35 and 38 to abut against each other, and this abutment causes the cylindrical cam body 35 to eccentrically move in the radial direction. A state in which the outer circumferential surface is pressed against the inner circumferential surface of the outer shaft 21 and the blade 43 protruding from the outer circumferential surface is strongly pressed against the inner circumferential surface of the outer shaft 21 to prevent contraction of the inner shaft 22. The inner shaft 22 can be fixed to the outer shaft 21 in this manner, and since the blade 43 is inclined outward in the direction of insertion of the inner shaft 22, the inner shaft 22 is not compressed. Even if a force in the direction is applied, the blade 43 is moved toward the outer shaft 21 by the applied force.
It bites into the inner circumferential surface of the inner shaft 22, reliably prevents contraction of the inner shaft 22, and fixes the inner shaft 22 at a desired length.

Further, according to the present invention, the abutting body 24 for the wall surface is provided at the ends of the outer shaft 21 and the inner shaft 22 that are spaced apart from each other.
24, and a pressing rotary body 25 is interposed between one of the abutting bodies 24 and the outer shaft 21 or the inner shaft 22 to advance the corresponding abutting body 24 toward the wall surface by rotation. Therefore, as shown above, the blade 4
3 is pressed against the inner surface of the outer shaft 21, the pressing rotary body 25 is rotated and the abutting body 2 is pressed against the inner surface of the outer shaft 21.
When the blade 4 is brought into pressure contact with the wall surface, the reaction force tries to contract the inner shaft 22, and the blade 43 is more firmly inserted into the inner circumferential surface of the outer shaft 21, thereby being securely locked. , if the pressing rotary body 25 is further rotated, both shafts 21 and 2 will be rotated according to the rotational force.
The two abutting bodies 24, 24 can be pressed against the wall surface with a large tensile force, and even if a relatively heavy article is supported on both shafts 21, 22, it will not come off the wall surface.

Furthermore, by rotating the pressing rotating body 25 in the opposite direction of the above operation, the pressing force of the abutting body 24 against the wall surface is released, and both shafts 21 and 22 can be easily removed from the wall surface. By relatively rotating the shafts 21 and 22 in the opposite direction to the above, both cam bodies 35 and 3
8 and then pull out the inner shaft 22 slightly to release the biting of the blade 43 into the inner circumferential surface of the outer shaft 21. In this state, the cylindrical cam body 35 is free from the screw shaft 33. Since it is eccentrically movable in the radial direction, the blade 43 relative to the inner circumferential surface of the outer shaft 21
While preventing the inner shaft 22 from biting into the contact body 24,
It can be inserted into the body to make it deflated.

[Brief explanation of the drawing]

Fig. 1 is a sectional plan view of a conventional example, Fig. 2 is a partial sectional front view of main parts of another conventional example, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Figs. 4 to 12 are 4 is a front view, FIG. 5 is an enlarged front view showing a section of the upper part of the pressing rotary body, and FIG. 6 is an embodiment of the present invention.
The figure is an enlarged longitudinal sectional front view of the locking device, and Figure 7 is the 6th
BB sectional view in the figure, FIG. 8 is a CC sectional view in FIG. 6, FIG. 9 is a DD sectional view in FIG. 6, FIG. 10 is an enlarged longitudinal sectional front view of the cylindrical cam body, FIG. 11 is a front view of the blade, FIGS. 12 a, b, and c are explanatory diagrams of the operating procedure during erection, and FIGS. 13 and 14 are front views showing an example of how the shaft-like body is used. 20 is an erected axoid body, 21 is an outer axis, 22 is an inner axis,
31 is a locking device, 32 is a nut member, 33 is a bolt (screw shaft), 35 is a cylindrical cam body, 36, 39
is a cam surface, 38 is a locking cam body, 40 is a locking portion, 4
3 is the blade, 44 is the groove.

Claims (1)

[Scope of utility model registration request] The inner shaft 22 is inserted into the outer shaft 21 so as to be freely drawn out, and a threaded shaft 33 is disposed in the center of the end of the inner shaft 22 inserted into the outer shaft 21 in the axial direction of the inner and outer shafts 21 and 22. A cylindrical cam body 35 formed on the shaft 33 with a cam surface 36 whose end face is inclined with respect to the shaft center.
is fitted loosely so as to be eccentrically movable in the radial direction, while a cam surface 39 opposite to the cam surface 36 of the cam body 35 is formed on one end surface, and the other end is elastically slidably contacted with the inner surface of the outer shaft 21. The locking cam body 38 forming the locking portion 40 is brought close to the cylindrical cam body 35 and the outer shaft 2
1, the screw shaft 33 is screwed into one of the locking cam body 38 and the end of the inner shaft 22, and the shaft end of the screw shaft 33 is fixed to the other. A blade 43 that is inclined outward toward the insertion direction of the inner shaft 22 is provided on the outer circumference of the cylindrical cam body 35 that is brought into contact with the inner surface, and furthermore, a blade 43 that is inclined outwardly toward the insertion direction of the inner shaft 22 is provided, and further, edges of the outer shaft 21 and the inner shaft 22 that are spaced apart from each other are provided. The contact body 2 against the wall surface
4 and 24, and a pressing rotary body 25 is provided between one of the abutting bodies 24 and the outer shaft 21 or the inner shaft 22, which advances the corresponding abutting body 24 toward the wall surface by rotation. A locking device with an extensible shaft-like body.