JPS6214608Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an interlock device for a power supply device for a refrigerated container or the like.

In the power supply device for a refrigerated container, as shown in FIG. 1, a pair of engaging claws 3 are provided on the receptacle 2 side of a switch box 1, and a pair of locking rods that move in and out in conjunction with an operating knob 5 of a switch 4 are provided. 6
When the required power plug is connected to the receptacle 2, the notch of each engaging claw 3 faces each locking rod 6, allowing the operation knob 5 to be turned on. A so-called interlock device is adopted in which the locking lever 6 locks each engaging claw 3 itself so that it cannot be separated from the power plug, and when the protective cap 7 is inserted into the receptacle 2 as shown in the figure, the operating knob 5 The on operation is disabled. However, conventionally, each of the engaging claws 3 is swingably supported around a pivot 8, and a spring (not shown) is used to urge the engaging portion 9 to constantly protrude inward in the radial direction. When inserting the power plug or the protective cap 7 into the receptacle 2, slide each engaging claw 3 radially outward while sliding along the guide surface 10 formed on the tip side of each engaging claw 3. Since they are made to expand, when removing these, it is necessary to manually operate each of the engaging claws 3 to expand them at the same time, which has the drawback of making handling extremely complicated. In addition, since each engaging claw 3 has a guide surface 10, and the guide surface 10 guides the power plug etc. while expanding, there is a problem in that the structure becomes larger. The springs and the like must also be made stronger, which results in a loss of smoothness of operation.

The purpose of this invention is to solve these conventional problems, and its feature is that a retaining claw is pivotally supported in the receptacle of the switch box so that it can move out and back in the radial direction. An interlock device for a power supply device in which a locking lever that moves in and out in conjunction with the on/off operation of a switch is provided so as to be slidable in the axial direction, and the locking lever is regulated by an engaging claw when a required plug is not connected. The receptacle is provided with a pusher that presses the engagement claw inward in the radial direction, and is positioned relative to the receptacle so that the pusher corresponds to a position where the engagement claw is pushed in the protruding direction and a position where the pusher is pushed in the retraction direction. The restraining ring is slidably fitted in the axial direction, and a regulating member is provided in the axial direction that abuts the engaging pawl to restrict the locking rod when disconnected, and restricts the restraining ring to the latter position when the required connection is made. The point is that it is slidably installed.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. In FIGS. 2 and 3, 11 is a switch box containing a switch, and 12 is a pair of left and right locking rods that are provided with a receptacle 13 in between. It is provided so as to be slidable in the axial direction so as to move in and out in conjunction with the on/off operation. The receptacle 13 is for connecting the required power plug 14, and is equipped with a bottomed cylindrical receptacle body 15 made of a suitable insulating material, and the bottom of the receptacle body 15 is electrically connected to the contact pin 16 of the power plug 14. A connectable contact body 17 is supported by the projection 18 . The receptacle body 15 has a spring receiving portion 19 approximately at the center in the axial direction, and a retaining ring 20 at the tip side.
are provided in the circumferential direction, and a pair of left and right recessed grooves 21 parallel to the axial direction and an opening 22 opening from the tip side of each recessed groove 21 to the inner circumference are formed between the two. There is. Reference numeral 23 denotes an engaging pawl formed in a substantially L-shape, and the engaging portion 24 is disposed in each recessed groove 21 in a state that it can protrude from the opening 22 into the receptacle body 15. The engagement pawl 23 is pivoted by a pivot shaft 26 that fits into a pivot groove 25 so that the engagement portion 24 can move in and out of the engagement portion 24 in the radial direction. Power plug 1
4 has an engaged portion 27 with which the engaging portion 24 of the engaging claw 23 is removably engaged, and when the power plug 14 is connected to the receptacle 13, each engaging claw 23
The outer surface 28 is substantially parallel to the axis. Reference numeral 29 denotes a spherical presser, which has a holding hole 31 formed in the restraining ring 30.
The engagement claws 23 are housed in the housing and are biased radially inward by a pressure spring 32, and this pusher 29 presses each engaging pawl 23 inward in the radial direction. Note that the elastic force of the presser 29 can be arbitrarily adjusted using the adjustment screw 33. restraining ring 30
is fitted around the outer periphery of the receptacle body 15 so as to be relatively unrotatable, and the pusher 29 is connected to the engaging claw 2.
3 in the protruding direction (the state shown in FIGS. 3 and 5) and the position in which the material is pressed in the retracting direction (the state shown in FIG. 4). A compression spring 34 urges the check ring 30 to the former position, and is interposed between the spring receiver 19 of the receptacle body 15 and the stepped portion 35 of the check ring 30. 3
Reference numeral 6 denotes a pair of left and right regulating members formed in a substantially L-shape, which are slidably supported in the axial direction on the spring receiving portion 19 side of the receptacle body 15, and are opposed to each locking rod 12. It has a contact portion 37 . Each regulating member 36 regulates the restraint ring 30 so that it cannot move when the power plug 14 is connected to the receptacle 13 and the switch is turned on as shown in FIGS. 2 and 3. When the protective cap 38 is inserted, it comes into contact with the engaging pawl 23 and restricts the locking rod 12 from being able to protrude.

Next, the effect will be explained. 2 and 3 show a state in which the power plug 14 is inserted into the receptacle 13 and the engaging claw 23 is irremovably engaged with the engaged portion 27. At this time, the restraining ring 30 is connected to the compression spring 34.
Since the pusher 29 is in contact with the retaining ring 20, the pusher 29 presses the engaging pawl 23 radially inward on the engaging portion 24 side of the pivot 26, and each engaging pawl 23, the engaging portion 24 engages with the engaged portion 27 of the power plug 14, and the outer surface 28 is in a substantially parallel state, so that the regulating member 36 can freely slide on the outer surface 28 of the engaging claw 23. Yes, there is a check ring 30 as shown in the diagram.
It can be moved arbitrarily to the stepped portion 35 side. When the operating knob is turned on, the switch is turned on and the locking rod 12 protrudes in the direction of the arrow a, as shown by the imaginary line, at the abutting portion 3 of the regulating member 36.
Contact with 7. Therefore, the restraint ring 30 cannot be moved in the direction indicated by arrow b (release direction), and the power plug 14 is therefore completely locked so that it cannot be pulled out.

When unplugging the power plug 14, first operate the operating knob to the OFF position to return the locking rod 12 in the direction indicated by arrow b, and then slide the check ring 30 in the direction indicated by arrow b while resisting the compression spring 34. . Then, the pusher 29 crosses the pivot 26 and engages the engaging claw 2 on the opposite side of the engaging portion 24.
3, and the engaging claw 23 retracts radially outward from the receptacle body 15 as shown in FIG. 4, so that the power plug 14 can be easily unlocked.
After that, the power plug 14 may be pulled out in the direction of the arrow a.

When the protective cap 38 is inserted into the receptacle 13, as shown in FIG. Since the locking lever 12 is in contact with the mating claw 23 and is therefore restricted from protruding by the regulating member 36, it is impossible to turn on the operation knob while the protective cap 38 is attached.

Note that the presser 29 may have a shape other than a spherical shape.

As described in detail in the embodiments above, in the present invention, the engaging pawl is pressed radially inward by the presser by operating the check ring in the axial direction, and the engaging pawl is engaged and disengaged. , the engaging claw can be easily engaged and disengaged when inserting and removing the plug, and it is easy to handle.
The whole can be made very compact. Also, despite using a restraining ring, a separate regulating member is provided,
With this, the movement of the lock lever or check ring is regulated according to the purpose, so that the predetermined interlock function can be sufficiently ensured.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a conventional example, Fig. 2 is a partially cutaway plan view showing an embodiment of the present invention, Fig. 3 is an enlarged view of the same main part, and Figs. 4 and 5 are explanations of the same operation. It is a diagram. DESCRIPTION OF SYMBOLS 11...Switch box, 12...Lock rod, 13...Receptacle, 14...Power plug, 15...Receptacle body, 23...Engaging claw, 24...Engaging part, 27...Engaged part , 29...
...pressure element, 30...restraint ring, 34...compression spring,
36...Regulation member.

Claims (1)

[Scope of utility model registration request] An engaging pawl for preventing removal is pivoted to the receptacle of the switch box so that it can move in and out in the radial direction, and a locking rod that moves in and out in conjunction with the on/off operation of the switch is provided to be able to slide in the axial direction to disconnect the required plug. An interlock device for a power supply device in which a locking rod is sometimes restricted by an engaging claw is provided with a pusher that presses the engaging claw radially inward, and the pusher presses the engaging claw in the protruding direction. A restraining ring is fitted around the receptacle so as to be slidable in the axial direction so as to correspond to the position and the position of pressing in the retracting direction, and when it is not connected, the restraining ring is brought into contact with the engaging pawl to restrict the locking lever. An interlock device for a power supply device, characterized in that a regulating member is slidably provided in the axial direction for regulating the check ring to the latter position when a required connection is made.