JPH0321128Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention uses a movable frame on which a unit is mounted in a unit insertion/removal mechanism using an operation handle, such as a mechanism for closing and opening a switch, circuit breaker, etc. This invention relates to a device that automatically and reliably locks into a preset position.

[Conventional technology]

In switches and the like, various devices have been devised so that a movable frame on which a unit such as a device is mounted is locked in an immovable state at a fixed position such as a disconnection position or a connection position. JP-A-55-103005 discloses that when inserting a control unit into a unit chamber, an engaging piece provided on the bottom plate is rotated by a pin, and an engaging hole provided on a shelf plate of the unit chamber is rotated. The structure is such that the unit is fixed in the connected position. When pulling out the unit from the connected position to the disconnected position, rotate the engagement piece to remove it from the engagement hole, and then pull the unit forward.

[Problem that the invention attempts to solve]

With such a structure, when operating to a desired position, it is necessary to perform unlocking and locking operations once each before and after. For this reason, the operation is troublesome, and if the lock operation is forgotten, external vibrations, shocks, etc. may cause poor contact at the connection part with the vertical bus bar, resulting in abnormal overheating, leading to spillover accidents. Unexamined Japanese Patent Publication 1983-
A similar problem exists in the locking device for a multi-tiered switchboard unit described in Japanese Patent No. 201612.

Also, screw type ones (for example, Utility Model No. 54-82046)
In the case of the above-described method, the rotational operation force is light, so even if the locking stopper is hit, the user may continue operating without noticing it, which may bend the stopper and cause the set position to shift.

The present invention has been made in view of these conventional problems, and aims to provide an automatic position locking device that can automatically lock and unlock a lock in a fixed position without requiring special operations. purpose.

[Means for solving problems]

In order to achieve this purpose, the automatic position locking device of the unit insertion/removal mechanism of the present invention is provided with a movable frame that can move forward and backward with respect to a fixed frame, and is interlocked so as to be rotatable about an axis provided in the fixed frame. Attach the arm,
A lock collar into which the tip of the operating handle is inserted is attached to the tip of the interlocking arm so that it can slide freely and is biased in the extension direction, and the rotational movement of the interlocking arm based on the rotational operation of the operating handle is controlled by the locking collar of the movable frame. A lever interlocking mechanism for converting forward and backward movement is provided, and a long hole with a width W smaller than the outer diameter _d3 of the lock collar is formed on the front surface of the fixed frame, corresponding to the locus of movement of the tip of the lock collar attached to the interlocking arm. , and at a position corresponding to the fixed position of the movable frame in the elongated hole, a notch having a diameter d ₁ larger than the width w of the elongated hole and the diameter d ₃ of the lock collar, and from which the tip of the lock collar projects. It is characterized by the formation of

The aforementioned operation handle has an elongated hole with a width w smaller than the diameter d ₁ of the notch in the middle part of the tip of the operation handle.
forming a flange having a diameter D _b larger than that of the flange, and making the diameter D _a of the tip of the flange larger than the width w of the elongated hole;
It is preferable that the diameter D _c of the intermediate portion between the collar portion and the grip portion be smaller than the width w of the elongated hole, in order to prevent the operation handle from starting and ending at an intermediate position.

[Operation] In the present invention, the lock collar is attached to the interlocking arm while being biased forward by a spring or the like. When the movable frame is not in operation, that is, when the movable frame is in the normal position, the tip of the lock collar stably projects from the notch on the front surface of the fixed frame. Since the rotational movement of the lock collar and the forward and backward movement of the movable frame are linked, the movable frame will not move due to vibrations or the like. When the operating handle is inserted into the lock collar in order to move the movable frame, the lock collar retreats against the biasing force during insertion, and is released from the state of movement restraint due to the elongated hole narrower than the outer diameter of the lock collar. It becomes possible to move. When the operating handle is moved to the normal position, since a notch is provided at that position, simply by removing the operating handle, the lock collar will protrude due to its biasing force. In that position,
Due to the relationship between the lock collar and the dimensions of the long hole, the movable frame and operating handle are in a locked state.

In addition, the operation handle is provided with a flange portion having a diameter smaller than the diameter of the notch portion and larger than the width of the elongated hole in the middle part of the tip of the operation handle. By making the diameter of the water smaller than the width of the hole, and making the diameter of the middle part between the flange and the grip part smaller than the width of the elongated hole, the operating handle can be inserted and removed only at the notch, and the other intermediate parts can be inserted and removed. Since the flange cannot be removed from the elongated hole in this position, half-hearted operation can be prevented.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the case where this invention is applied to a closed switchboard will be concretely demonstrated based on the Example shown in illustration.

FIG. 2 is a cross-sectional plan view of a switchboard housing the unit frame (fixed frame) and contact mounting frame (movable frame) of the present invention, and FIG. 3 is a partial front view thereof. In the figure, 1 is the panel frame that constitutes the box of the switchboard, 2
is a shelf board with the required number of stages of the board frame 1 fixed,
3 and 4 are doors, respectively. A guide frame 2a is provided on the shelf board 2, and a unit frame 5 having a device mounting plate portion 27 for attaching various devices is inserted and mounted from the front side of the panel frame 1 along the guide frame 2a. Reference numeral 6 denotes a roller provided so that the unit frame 5 can be mounted with a light force. On the unit frame 5, a contact mounting frame 9 with a power supply contact 7 and a load contact 8 provided on the back side is connected to an operating handle 18 and an interlocking unit using a unit frame guide portion 26 formed on the unit frame 5 as a guide. Arm 1
It is movably attached by the operation of 6.
Both of these contacts 7 and 8 are wired to equipment mounted on the unit frame 5 using electric wires or the like (not shown).

The panel frame 1 is provided with, for example, a three-phase, four-wire bus bar 10 and a load-side terminal 11 to which the power contact 7 and the load contact 8 are connected.

Lock pins 12 are embedded in two places on the shelf board 2, and when the unit frame 5 is inserted into the shelf board 2, a lock pin 12 is attached to the unit frame 5 in the middle by a shaft 13a. The groove 13b on the front side (clockwise side) of 13 is engaged and cannot be separated. 14 is a spring for biasing the hook 13 clockwise and maintaining the engaged state, and 13c is a release lever for releasing the engagement.

As shown in FIG. 4, a protrusion 13d, a recess 13e, and a straight portion 13f are formed on the back side of the hook 13, which interact with the actuator 24 fixed to the contact mounting frame 9 side. When the contact mounting frame 9 is in a disconnected position with respect to the unit frame 5, the actuator 24 pushes the protrusion 13c against the biasing force of the spring 14, as shown in FIG. 4a. It is in a slightly rotated state around the shaft 13a.
Therefore, the hook 13 is in a slightly retracted state with respect to the lock pin 12. When the unit frame 5 is inserted into the shelf board 2 together with the contact mounting frame 9 in this state, the lock pin 12 shown in the broken line state in FIG.
The hook 13 moves while tilting slightly to the left, fits into the groove 13b, and settles into a solid line state. When removing the unit frame 5 from the shelf board 5, push the release lever 13c by hand to the state shown by the dashed line. The lock pin 12 and the hook 13 will be disengaged, so the unit frame 5 can be pulled out in this state. If you tighten it, you can remove it smoothly.

When the contact mounting frame 9 is in the test position or connection position with respect to the unit frame 5, if the unit frame 5 is allowed to be inserted into the shelf board 2 as it is, the contacts will be directly connected to the power supply, which is dangerous. . Also,
Even if it were possible to pull out the unit frame 5 in the test or connection position from the shelf board 2, it would still be dangerous. For this reason, the contact mounting frame 9
When the actuator 24 is in the test position and the connection position with respect to the unit frame 5, the actuator 24 is attached to the straight part 13 on the back side of the hook 13, as shown in FIG. 4b.
It is configured so as to come into contact with f. In the same figure, the position of the actuator 24 indicated by a solid line is a test position, and the position indicated by a chain line is a connection position. Contact mounting frame 9
When the unit frame is in this positional relationship, the hook 13 is sandwiched between the actuator 24 and the pin 12 and cannot be rotated. Therefore, the hook 13 prevents the lock pin 12 fixed to the shelf board 2 from entering or leaving. As a result, in the state shown in FIG. 4b, the unit frame 5 cannot be attached to the shelf board 2, and the attached unit frame 5 cannot be pulled out even if the release lever 13c is pressed. In this way, attachment and detachment of the contact at a position other than the intended disconnection position is prevented, increasing safety.

FIG. 2 shows a state in which the unit frame 5 is fixed to the shelf board 2 by engaging the hook 13 with the lock pin 12 implanted in the shelf board 2 as described above.
The positions of the shelf board 2 and the unit frame 5 can be adjusted by operating the operating handle 18, which will be described below.
It remains immovable no matter where you move it.

Next, a mechanism for moving between the unit frame 5 and the contact mounting frame 9 will be explained.

An interlocking arm 16 is attached to the unit frame 5, which is rotatable about an interlocking arm rotation shaft 15 embedded in the unit frame 5 and drives a contact. is the drive shaft 17
is installed. The drive shaft 17 is inserted into an elongated hole 16a provided at the tip of the interlocking arm 16, and is freely engaged therewith. An operating rod 19 is fixed to the base end of the interlocking arm 16 to engage with an operating handle 18 for moving the contact mounting frame 9 to the test position and the connection position.
The tip of the operating rod 19 faces an elongated hole 5b opened in the grip frame 5a on the front side of the unit frame 5.

The operating rod 19 has a built-in lock collar 21 that is pressed forward by a spring 20, and a guide hole 2 is formed in the center of the lock collar 21.
1a, and the tip of the operating handle 18 shown in FIG. 5 is inserted into this guide hole 21a. This operation handle 18 has an insertion portion 18a at the tip and a collar portion 18.
b, consisting of a small diameter portion 18c and a grip portion 18d. The grip portion 18d is coated with rubber. As shown in _FIG .
larger than the width w of b, and the notch portions 5b-1, 5
It is set smaller than the diameter d ₁ of b-2 and 5b-3. Further, the diameter D _c of the small diameter portion 18c is the same as that of the long hole 5b.
is set smaller than the width w of . Flange part 18b
The diameter D _b is larger than the diameter d ₂ of the guide hole 21a of the lock collar 21, and naturally larger than the width w of the elongated hole 5b of the grip frame 5a.
It is set smaller than the diameter d ₁ of 2.5b-3.

As a result, the operating handle 18 can be opened at the notch 5b.
-1, 5b-2, and 5b-3, it cannot be inserted into the lock collar 21, and once inserted into the lock collar 21,
It cannot be removed in the middle of the elongated hole 5b, and the notch 5
It can be removed only at locations b-1, 5b-2, and 5b-3. Moreover, this notch 5b-
At locations 1, 5b-2, and 5b-3, the biasing force of the spring 20 causes the tip of the lock collar 21 to slightly protrude forward from this notch. The diameter d ₃ of the tip of the lock collar is the notch 5b.
-1, 5b-2, and 5b-3 are made slightly smaller in diameter than the diameter _d1 , and can be locked by fitting into the notch when protruding. This relationship can be expressed as follows.

D _c < w < D _a < d ₃ < d ₁ , w < d ₂ < D _b < d ₁ Therefore, insert the tip of the operating handle 18 into the lock collar 21, and while pushing it in, move the operating handle 18 as shown in the drawing. , the contactor unit 9 is moved to the test position and the connection position by turning to the right. The three large-diameter notches 5b-1, 5b-2, and 5b-3 of the elongated hole 5b in FIG. The tip of 18 can be inserted into and pulled out from the operating rod 19. If the operation of the operating handle 18 is stopped at a position other than these fixed positions, the operating handle 18 cannot be removed from the lock collar 21, so it can be identified from the outside, and the outer end of the operating handle 18 may become an obstruction. Since the door cannot be closed, it can be seen that it is not easily manipulated into position.

When the operating rod 19 is operated at both ends of the elongated hole 5b in the grip frame 5a, and the tip of the operating rod 19 reaches the notch 5b-1 or 5b-3,
Stopper 5 to stop operating rod 19
c, 5d (see Figure 9). These stoppers 5c, 5d are made to come into contact with a trapezoidal head formed at the tip of the operating rod 19, and the sloped surface of the trapezoidal head is brought into contact with the stopper surface when it comes into contact with the stoppers 5c, 5d. They are made to abut at approximately right angles.

When the other notch 5b-1 or 5b-3 approaches the notch 5b-2 at the test position, which is an intermediate position, the notch 5b-2 swings to clear a path.
Inspection position stoppers 22 and 23 are provided to prevent movement from. This prevents the operating handle 18 from being carelessly moved from the test position to the disconnection position or the close position, and prevents it from moving directly to the connection position when attempting to move from the disconnection position to the test position. When operating the operating handle 18, the stopper 22
Alternatively, by pushing the protruding piece 22a or 23a of 23, the other end is raised so that the operating handle 18 can move freely. In addition, 25 in the figure is a contactor position display name plate, and the contactor operation mechanism, that is, the interlocking arm 16.
It displays the position of the contact and the position of the contact. FIG. 8 shows the details.

6 and 7 respectively show the operating handle 1.
8, the contact mounting frame 9 is moved to the test position and the connection position.

In the test position shown in FIG. 6, the power contact 7 is in contact with the busbar 10 in order to supply power to the equipment mounted on the unit frame 5, but the load contact 8 is in contact with the load side terminal 11. position to maintain sufficient clearance for disconnection. This makes it possible to supply power to the equipment being tested without supplying power to the load.

In the connection position shown in FIG. 7, the power contact 7 and the load contact 8 are both connected to the bus bar 10 and the load side terminal 11, and are in a normal operating state.

In this way, in this device, the unit frame 5
can be stored in a fixed position relative to the panel frame 1 in which the door 3 can be closed, and in that position, the contact mounting frame 9 can be operated to the disconnection position, the test position, and the connection position.

The above has described an example in which the present invention is applied to the operating mechanism of a closed switchboard, but it goes without saying that the present invention can also be applied to unit frame insertion/removal mechanisms of other devices.

[Effect of idea]

As explained above, in the present invention, the lock collar is configured to move forward and backward using a spring or the like, and the diameter of the lock collar and the dimensions of the elongated hole and the notch are set as described above.

As a result, in the normal position, simply by releasing the operating handle, the lock collar automatically protrudes from the notch due to its biasing force. Therefore, the movable frame can be locked without requiring any special locking operation.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the relationship between the dimensions of the long hole, operating handle, and lock collar in the present invention, Figure 2 is a cross-sectional plan view of a closed switchboard showing an embodiment of the present invention, and Figure 3 is a front view of its main parts. Figure 4 is an explanatory view showing the engagement relationship between the hook and the lock pin, Figure 5 is a perspective view of the operating handle, Figures 6 and 7 are movement of the contact mounting frame in the test position and connection position, respectively. FIG. 8 is a plan view showing the state, FIG. 8 is a front view showing details of the name plate, and FIG. 9 is an enlarged view showing the relationship between the operating rod and the stopper. 1: Panel frame, 2: Shelf board, 3, 4: Door, 5:
Unit frame, 5a: Grip frame, 5b: Long hole, 5b
-1, 5b-2, 5b-3: Notch, 5c, 5
d: Stopper, 6: Roller, 7: Power contact,
8: Load contact, 9: Contact mounting frame, 10: Bus bar, 11: Load side terminal, 12: Lock pin, 1
3: Hook, 13a: Shaft, 13b: Groove, 13
c: Release lever, 13d: Projection, 13e:
recessed part, 13f: straight part, 13g: cam part inclined surface, 14: spring, 15: interlocking arm rotating shaft, 16: interlocking arm, 16a: long hole, 17: drive shaft, 18: operating handle, 19: operating rod,
20: Spring, 21: Lock collar, 22,
23: Stopper, 24: Operator, 25: Nameplate,
26: Unit frame guide section, 27: Equipment mounting section.

Claims (1)

[Claims for Utility Model Registration] 1. A movable frame is provided so as to be movable forward and backward with respect to a fixed frame, and an interlocking arm 16 is attached so as to be rotatable about a shaft 15 provided on the fixed frame, and an operating handle 1 is provided.
A lock collar 21 into which the tip of the lock collar 8 is inserted is attached to the tip of the interlocking arm 16 so as to be slidable and biased in the extension direction, and the rotational movement of the interlocking arm 16 based on the rotational operation of the operating handle 18 is controlled. A lever interlocking mechanism is provided for converting the forward and backward movement of the movable frame, and the lever interlocking mechanism is provided on the front side of the fixed frame so as to correspond to the locus of movement of the tip of the lock collar 21 attached to the interlocking arm 16, and to be larger than the outer diameter d ₃ of the lock collar 21. A long hole 5b with a small width w is formed, and a hole 5b with a diameter d ₁ larger than the width w of the long hole 5b and the diameter d ₃ of the lock collar 21 is formed at a position corresponding to the fixed position of the movable frame in the long hole 5b. Moreover, the automatic position locking device for the unit insertion/removal mechanism is characterized in that cutouts 5b-1 to 5b-3 are formed from which the tip of the lock collar 21 projects. 2. The operation handle 18 has cutout portions 5b-1 to 5b-3 in the middle part of the tip of the operation handle 18.
Diameter D _b smaller than d ₁ and larger than width w of elongated hole 5b
A flange portion 18b is formed, the diameter D _a of the tip portion 18a is larger than the width w of the long hole 5b, and the diameter D of the intermediate portion 18c between the flange portion 18b and the grip portion 18d is made larger than the width w of the elongated hole 5b. _c , the width w of the long hole 5b
An automatic position locking device for a unit insertion/removal mechanism according to claim 1, which is characterized by having a diameter smaller than that of the utility model registered claim 1.