JPH0547278Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a joint device with a locking means that can be utilized in a foldable ladder or the like.

(Prior Art) As shown in FIG. 10, this type of joint device with a locking means includes a pair of rotary discs 2 and 3 which are rotatably supported by a support shaft 1, one of which is a rotary disc 2. Locking recesses 5A to 5c are provided on the peripheral edge 4 of the rotary disk 3, and a locking piece 7 is provided on the other rotary disk 3 and can be freely fitted into and removed from the locking recesses 5A to 5C and is biased in the fitting direction by a spring 6. and a lock release lever 8 for moving the locking piece 7 in the release direction,
By fitting the locking piece 7 into any one of the locking recesses 5A to 5C, the mounting legs 9 and 10 connected from both rotary disks 2 and 3 are fixed at a predetermined angle. The locked recesses 5A to 5 can be
By pushing out the locking piece 7 fitted into the locking recess 5A to 5C by the locking release lever 8 against the biasing force of the spring 6, both the rotary disks 2 and 3 (the mounting legs The parts 9 and 10) are configured to be able to rotate relative to each other around the support shaft 1.

Therefore, the locking piece 7 is inserted into the locked recesses 5A to 5C.
In order to hold the intermediate rotary disc 11 in the detached position relative to the rotary disc 2, the intermediate rotary disc 11 is rotatable within a certain range around the spindle 1, and the intermediate rotary disc 11 is rotated in the opposite direction (arrow) with respect to the rotary disc 2. A torsion coil spring 13 is provided which urges the coil spring 13 to abut against the stopper pin 12 (direction R), and the intermediate rotary disk 11 rotates at a constant angle in the positive direction (direction of arrow F) against the spring 13. Then, recesses 14A to 14C that match the locked recesses 5A to 5C are formed on the periphery of the intermediate rotary disk 11, and each recess 14A to
Protrusions 15a to 15c that protrude from the peripheral edge 4 of the rotating disk 2 and are not caught when the locking piece 7 moves in the opposite direction are provided on the side edge of the forward direction 14C.

According to such a configuration, when the locking lever 8 moves the locking piece 7 backward to the release position where it separates from the locked recesses 5A to 5C of the rotary disk 2, the intermediate rotary disk 11 is moved by the biasing force of the spring 13. As a result, it rotates in the direction of arrow R to a position where it comes into contact with the stopper pin 12, and each of the locked recesses 5A to 5C of the rotary disk 2 is closed. Therefore, even if you release your hand from the locking release lever 8 and return the locking piece 7 to the fitting direction, the locking piece 7 will ride on the periphery of the intermediate rotary disk 11 and the locked portion of the rotary disk 2 will be removed. Since they do not fit into the recesses 5A to 5c, both rotary disks 2 and 3 can be rotated relative to each other, but the rotation direction at this time is the same as that of the mounting legs 9 and 1.
0, the locking piece 7 slides on the periphery of the intermediate rotary disk 11.
When the mounting legs 9 and 10 are opened in the positive direction (direction of arrow F), the intermediate rotary disk 1
The locking piece 7 sliding on the peripheral edge of the locking piece 1 is caught on the first protrusion 15a to 15c that it encounters, and the locking piece 7
moves while rotating the intermediate rotary disk 11 in the direction of arrow F against the biasing force of the spring 13.
When the locking recesses 5A to 5C of the rotary disk 2 match, the locking piece 7 that is caught in front of one of the protrusions 15a to 15c is moved by the biasing force of the spring 6. Opposing locked recesses 5A~
5C and the recesses 14A to 14C, thereby locking both rotary disks 2 and 3.

That is, when the locking piece 7 that has been moved to the release position by the lock release lever 8 is automatically held at the release position, and when both rotary disks 2 and 3 are relatively rotated in the forward direction (direction of arrow F), first When the locking pieces 7 are automatically engaged with the locking recesses 5A to 5C that meet each other and the rotating discs 2 and 3 are relatively rotated in the opposite direction (in the direction of arrow R), the locking recesses 5A to 5C and the locking pieces are automatically engaged. In order to make it possible to rotate both rotary disks 2 and 3 to the rotation limit without engaging them with 7, the intermediate rotary disk 11 and the torsion coil spring 13 having the above-described structure were provided. It is.

(Problem to be solved by the invention) In the conventional configuration as described above, a large intermediate rotary disk 11 and a strong force that rotates the intermediate rotary disk 11 reliably against the friction between it and the rotary disk 2 are required. Since the torsion coil spring 13 must be interposed between the rotary disks 2 and 3, not only is the cost high, but also the elastic fatigue of the torsion coil spring 13 and the rotary disk 2 and the intermediate There was a high possibility that the intermediate rotary disc 11 would not rotate smoothly due to friction between it and the rotary disc 11, and that it would not be able to perform its intended function.

(Means for Solving the Problems) In order to solve the above-mentioned conventional problems, the present invention aims to solve the above-mentioned conventional problems. A locking recess is provided, a locking piece that can be freely fitted into and removed from the locked recess and biased in the fitting direction, and a locking release lever that moves the locking piece in the detaching direction. In the joint device provided with the other rotary disk,
An automatic engagement stopper is provided that enters between the tip of the locking piece that has been moved backward to the release position by the lock release lever and the periphery of the one rotary disk and holds the locking piece in the release position. , an engagement release operation part that moves an automatic engagement stopper that holds the locking piece in the release position to a non-engagement position in front of the locked recess when the two rotary disks rotate relative to each other in the forward direction; The present invention proposes a joint device with a locking means formed on the periphery of one of the rotary discs.

(Operation of the invention) When both rotary disks are rotated relative to each other in the forward direction while the locking piece is held at the detached position by the automatic engagement stopper, the locking piece reaches the position of the locked recess. Before the disengagement operation part and the automatic engagement stopper come into contact with each other, the automatic engagement stopper is moved to the disengaged position and separated from the locking piece, so that the locking piece is Due to force, it comes into contact with the periphery of one of the rotary disks. In this state, as the relative rotation of both rotary disks progresses and the locking piece reaches the position of the locking recess of one of the rotary disks, the locking piece is fitted into the locking recess by the biasing force. , both rotary disks are locked to each other.

To release the locked state of both rotary disks, the locking piece is released from the locked recess by the locking release lever. At this time, the automatic engagement stopper automatically engages the tip of the locking piece that has reached the release position and holds the locking piece in the release position, so both rotary disks can be moved with the release lever released. Can be rotated relative to each other. At this time, when rotating both rotary disks relative to each other in the forward direction, as described above, before the locking piece reaches the position of the next locked recess, the automatic The engagement stopper is moved to the non-engagement position by the disengagement operation section and is disengaged from the locking piece, so that the locking piece reaches the position of the next locked recess. At this time, the locking piece fits into the locked recess to lock both rotary disks again. If both rotary disks are relatively rotated in opposite directions, the automatic engagement stopper that holds the locking piece in the disengaged position is switched to the disengaged position by the disengagement operation section. Therefore, it passes through without being fitted into the locked recess, and both rotary disks can be rotated relative to each other in opposite directions up to their rotation limits.

(Example) An example of the present invention will be described below based on the attached illustrative drawings.

In Figures 1 to 4, 20 is the mounting leg 2.
1 and 22 are a pair of rotary discs that sandwich the rotary disc 20 from both left and right sides, and are provided with mounting legs 23. Reference numeral 24 denotes a support shaft that pivotally connects both rotary disks 20 and 22 such that they can rotate freely relative to each other.

On the periphery 25 of the rotary disk 20 located inside, there are a plurality of locked recesses 26A to 26C, and protruding engagement release operation parts 27A to 27C located a certain distance in front of each of the locked recesses 26A to 26C. is formed. On the side of the pair of rotary disks 22 located on the outside, there are locking pieces 28 that selectively fit into the locking recesses 26A to 26C, and a spring 29 that biases the locking pieces 28 in the fitting direction. and a lock release lever 30 for releasing the locking piece 28 from the locked recesses 26A to 26C.

The locking piece 28 is supported so as to be movable in the radial direction passing through the support shaft 24 by fitting both left and right ends into guide slots 31 provided in the pair of rotating discs 22 . Both front ends 32a of a V-shaped spring receiving member 32 installed between the pair of rotary disks 22 are engaged with the rear end of the guide slot 31, and the spring receiving member 32 passes through the rear end thereof. A locking piece positioning member 34 that fits into the rear end of the locking piece 28 is attached to the tip of the guide rod 33, and the tip of the guide rod 33 from which the locking piece positioning member 34 protrudes is attached to the locking piece 28. The spring receiving member 3 is fitted into the hole 35 provided in the spring receiving member 3.
The spring 29 is attached to the guide rod 33 between the rear end of the spring 29 and the locking piece positioning member 34.
is loosely fitted. The locking piece positioning member 34 attached to the locking piece 28 via the guide rod 33 is moved from the pair of rotary disks 22 to the locking piece positioning member 34, which is attached to the locking piece 28 via the guide rod 33, so that the locking piece 28 moves left and right and leaves the guide slot 31. This is prevented by fitting between them.

The lock release lever 30 is connected to a pair of rotary disks 22.
A pair of locking piece push-up portions 30a are pivotally connected to the base of the rotary disk 30 by a support shaft 36, and are located between the inner rotary disk 20 and the outer pair of rotary disks 22.

The pair of rotary disks 22 are provided with an automatic engagement stopper 37 and a plate spring 38 that biases the stopper 37 in the engagement direction. The automatic engagement stopper 37 is connected to the elongated hole 3 provided in the base.
9, the support shaft 40 allows for rocking around the support shaft 40 and movement along the elongated hole 39 (movement within a range of about the protruding height of the disengagement operation parts 27A to 27C). A pair of rotary disks 2
The support shaft 4 is mounted within the mounting leg 23 of the
The locking piece 28 is moved between the tip of the locking piece 28 and the peripheral edge 25 of the rotary disk 20 by swinging around 0.
It is provided with a tip hook portion 37a that enters from the rear side. The outer end of the plate spring 38 is locked to the support shaft 40, and the plate spring 38 is held by a pin 41 attached to the pair of rotary disks 22 (mounting legs 23) behind the automatic engagement stopper 37. The inner end thereof is bent so as to come into pressure contact with the rear surface of the tip of the automatic engagement stopper 37.

As shown in FIGS. 1 and 3, when both rotary disks 20 and 22 are at the closed movement limit position where both mounting legs 21 and 23 are adjacent to each other in parallel, the locking piece 28 is
It is held by an automatic engagement stopper 37 at the detached position where it has moved backward against the spring 29. At this time, the automatic engagement stopper 37 is at the forward limit position where the distal hook portion 37a abuts against the circumferential edge 25 of the rotary disk 20, and the distal hook portion 37a is in contact with the distal end of the locking piece 28 and the circumferential edge 25 of the rotary disk 20. It enters between the locking piece 28 from the rear side.

When the rotary disks 20 and 22 are rotated relative to each other in the positive direction in which both the mounting legs 21 and 23 are opened relative to each other in this state, the locking piece 28 is moved to the first disengagement operation part 2.
It will pass through position 7A, but at this time,
When the distal end hook portion 37a of the automatic engagement stopper 37 collides with the disengagement operation portion 27A, forward movement in the direction of arrow F is blocked, and only the locking piece 28 moves forward, as shown in FIG. The automatic engagement stopper 37 swings backward around the support shaft 40 to a non-engaged position against the biasing force of the plate spring 38, and is disengaged from the tip of the locking piece 28. Therefore, the locking piece 28
comes into contact with the peripheral edge 25 of the rotary disk 20 due to the biasing force of the spring 29. Engagement release operation section 27
The automatic engagement stopper 37, which has swung backwards due to the collision with A, is pushed up to the backward limit by the engagement release operation part 27A as the relative rotation of both rotary disks 20 and 22 progresses, and the engagement is stopped. Release operation section 27
You will have to drive over A.

As shown in FIG. 5, the first disengagement operation section 2
The locking piece 28 that has passed through 7A is in contact with the peripheral edge 25 of the rotary disk 20 due to the biasing force of the spring 29.
As the relative rotation of both rotary discs 20 and 22 progresses and the locking piece 28 reaches the position of the first locked recess 26A, the locking piece 28 is moved to the position of the first locked recess 26A, as shown in FIG. It is fitted into the recess 26A by the biasing force of the spring 29, and both rotary disks 20 and 22 are locked at a predetermined angle.

To release the locked state of both rotary discs 20 and 22, rotate the lock release lever 30 around the support shaft 36 as shown by the imaginary line in FIG. The portions near both left and right ends of the locking piece 28 are pushed up, and the locking piece 28 is moved backward against the spring 29 in a direction in which it is removed from the locked recess 26A. When the locking piece 28 moves backward by a predetermined distance, the tip hook portion 37a of the automatic engagement stopper 37 automatically engages with the tip of the locking piece 28 by the biasing force of the plate spring 38, and the locking piece 28
is held in a position separated from the locked recess 26A. At this time, the automatic engagement stopper 37 temporarily
Due to the friction between the locking piece 28 and the locking piece 28, the locking piece 28 moves backward together with the locking piece 28 to the retract limit, but as the push-up operation force from the lock release lever 30 disappears, the force of the spring 29 engages the locking piece. Together with the locking piece 28 moving forward in the direction, the locking piece 28 returns to the original position, that is, the position where the tip hook portion 37a can come into contact with the peripheral edge 25 of the rotary disk 20.

When the locking piece 28 is moved backward to the disengaging position by the locking release lever 39 as described above and the locking piece 28 is held at the disengaging position by the automatic engagement stopper 37, both rotating discs 20, 22 can be freely rotated relative to
If the relative rotation direction at this time is the positive direction in which the mounting legs 21 and 23 are opened, as described above, the locking piece 28 is rotated before the locking piece 28 reaches the next locked recess 26B. 28 and the automatic engagement stopper 37 is released by the next engagement release operation section 27B in the same manner as described above, so that the engagement piece 28 is automatically fitted into the next engagement recess 26B. However, both rotary discs 20 and 22 are locked again at a predetermined angle. When locking both rotary discs 20, 22 at an angle determined by the engagement of the locking recess 26C with the locking piece 28, the locking piece 28 once fitted into the locking recess 26B
After disengaging with the lock release lever 30, both rotary disks 20, 22 may be further rotated in the forward direction.

Both rotary disks 20, 22 after the locking pieces 28 released from the locking recesses 26A to 26C by the lock release lever 30 are held by the automatic engagement stoppers 37.
When the relative rotation direction of is the opposite direction that closes the mounting legs 21 and 23, as shown in FIG.
When the distal end hook portion 37a of the automatic engagement stopper 37 engaged with the distal end of the locking piece 28 is in advance of the locking piece 28, the disengagement operation portions 27A to 27
C in the direction of arrow R, the automatic engagement stopper 37 is moved in the direction away from the locking piece 28, that is, in the direction of the non-engagement position, by the engagement release operation parts 27A to 27C. The automatic engagement stopper 37 and the locking piece 28
are pushed up against the spring 29 and moved backward while the respective disengagement operating portions 27A to 2
We will overcome and pass 7C. That is, since the holding action of the locking piece 28 by the automatic engagement stopper 37 is not released by the engagement release operation parts 27A to 27C, both rotary disks 20 and 22 are held at the rotation limit (both mounting legs 21 , 23).

Incidentally, the plate spring 38 can be omitted by constructing the automatic engagement stopper 37 with a plate spring having an appropriate thickness. In this case, the direction of movement of the automatic engagement stopper 37 must be restricted to a straight line.

(Effects of the invention) As described above, the joint device with locking means of the present invention has the same function as the conventional joint device with locking means of this type shown in FIG. 10, but in terms of structure, Compared to the intermediate rotary disk 11 required in conventional devices, the self-engaging stopper that holds the locking piece in the disengaged position can be constructed very compactly, and the stopper is biased. Spring (plate spring 3 in the example)
8) also allows the use of smaller and relatively weaker torsion coil springs than the torsion coil springs 13 that bias the intermediate rotary disk 11, so that costs can be reduced. Moreover, compared to the conventional intermediate rotary disk 11, there is no fear that a large frictional force that would cause operating resistance will act on the automatic engagement stopper, so that the automatic engagement stopper can always operate smoothly and reliably. Therefore, the desired function can be reliably exhibited over a long period of time. Furthermore, the thickness of the overlapping portion of both rotary disks can be made relatively thin, which is effective in reducing the size and weight of the entire device.

[Brief explanation of the drawing]

Figure 1 is a side view, Figure 2 is an exploded perspective view, Figure 3 is a partially vertical side view of Figure 1, Figure 4 is an enlarged cross-sectional plan view of the main part, Figures 5 to 7 are each A partially longitudinal side view illustrating the operating state; FIGS. 8 and 9 are longitudinal sectional side views of main parts illustrating the state when the automatic engagement stopper passes over the disengagement operation section; FIG. 10 is a conventional device. FIG. 1, 24, 36, 40... Support shaft, 2, 20...
One rotary disk, 3, 22...The other rotary disk, 4,
25...periphery of rotary disks 1 and 20, 5A to 5C, 2
6A to 26C... Locked recess, 6, 29... Spring, 7, 28... Locking piece, 8, 30... Lock release lever, 11... Intermediate rotary disk, 13... Torsion coil Spring, 27A to 27C... Disengagement release operation part, 31... Guide slot, 32... Spring receiving member, 33... Guide rod, 34... Locking piece positioning member, 37... Automatic engagement stopper, 38...Plate spring.

Claims (1)

[Scope of utility model registration request] A locking recess is provided on the periphery of one of a pair of rotary disks that are mutually rotatably supported, and the other rotary disk is capable of being fitted into and removed from the locking recess in the fitting direction. In a joint device including a biased locking piece and a locking release lever that moves the locking piece in a release direction, the other rotary disk is retracted to a release position by the locking release lever. An automatic engagement stopper is provided that enters between the tip of the moved locking piece and the periphery of the one rotary disk to hold the locking piece in the disengaged position, and the two rotary disks are moved relative to each other in the forward direction. When rotating, an engagement release operation part is formed on the periphery of the one rotary disk to move an automatic engagement stopper that holds the engagement piece in the disengagement position to a disengagement position in front of the engagement recess. A joint device with locking means consisting of: