CN104347322A - Circuit breaker - Google Patents

Abstract

This invention relates to circuit breakers. The purpose of this is to make the circuit breaker and the switching mechanism part of the earth leakage detection unit common. In the circuit breaker in which the leakage detection unit is installed on the side of the circuit breaker for wiring, the circuit breaker for wiring includes: an operating handle (2); a fixed contact (3) with a fixed contact (3a); a movable contact (4) has a movable contact (4a) that is in contact with/disengages from the fixed contact; the opening and closing mechanism part (8) consists of a latch (6) that is rotatably supported and makes the latch engage in the on state. If the latch (6) and the latch receiver (7) are fitted and released, the movable contact will leave; the leakage detection unit includes an operating handle, which is controlled by the latch The opening and closing mechanism part composed of the lock and the latch receiver, and the leakage detection function part for detecting leakage; an oval-shaped groove (7d) is provided on the plate-shaped side of the latch receiver, and an oval-shaped groove (7d) is provided on the latch receiver. The other side is detachably provided with interlocking pins.

Description

circuit breaker

technical field

The present invention relates to a circuit breaker in which an electric leakage detection unit is mounted on a circuit breaker for wiring.

Background technique

As a conventional circuit breaker, for example, a circuit breaker for wiring, the configuration disclosed in Patent Document 1 is known.

The circuit breaker includes an operating handle protruding from a main body case, a fixed contact having a fixed contact, a movable contact having a movable contact that contacts/disengages from the fixed contact, and an opening and closing mechanism portion that drives the movable contact. , an overcurrent tripping device that detects overcurrent, and an arc extinguishing device that extinguishes the arc generated between the fixed contact and the movable contact.

In the circuit breaker described above, in the ON state of the circuit breaker, the movable contact is turned on, and the movable contact of the movable contact contacts the fixed contact of the fixed contact.

Then, when the operating handle is turned off from the on state of the circuit breaker, the movable contact is turned off by the opening and closing mechanism, and the movable contact and the fixed contact are separated. In addition, when the operating handle is turned on, the movable contact is turned on by the opening and closing mechanism, and the movable contact contacts the fixed contact.

When an overcurrent flows through the main circuit in the on state of the circuit breaker, the overcurrent tripping device detects the overcurrent, and the movable contact is disconnected from the fixed contact by the switching mechanism. Also, the arc generated between the movable contact and the fixed contact is extinguished by the arc extinguishing device.

Also, a circuit breaker having a leakage breaking function is known by attaching a leakage detection unit having a leakage detection function and a switching mechanism to the side of the circuit breaker (see Patent Document 2).

In a circuit breaker having such an earth leakage breaking function, when an electric leakage is detected by the electric leakage detection unit, the opening and closing mechanism part of the electric leakage detection unit is driven, and the operation of the opening and closing mechanism part is directed to the side of the circuit breaker through the trip cam. The opening and closing mechanism is transmitted, so that the contacts of the circuit breaker are opened.

[Patent Document 1] Japanese Patent Laid-Open No. 2001-307613

[Patent Document 2] Japanese Patent Laid-Open No. 2007-200641

However, in the conventional circuit breaker, the switching mechanism part of the circuit breaker and the switching mechanism part of the earth leakage detection unit are constituted separately. Therefore, each switching mechanism part needs to be manufactured separately, and the number of parts increases.

Contents of the invention

Then, the subject of this invention is providing the circuit breaker which can make the switch mechanism part of a circuit breaker and an electric-leakage detection means common.

In order to achieve the above-mentioned problems, according to the present invention, in the circuit breaker in which the leakage detection unit is mounted on the side of the circuit breaker for distribution, the circuit breaker for distribution includes:

operating handle;

Fixed contacts, having fixed contacts;

a movable contact having a movable contact that makes contact with/disengages from the fixed contact; and

The opening and closing mechanism is composed of a rotatably supported latch and a plate-shaped latch receiver that fits the latch in the ON state. When the fitting between the latch and the latch receiver is released , so that the above-mentioned movable contact is separated;

The leakage detection unit includes an operating handle, an opening and closing mechanism part composed of the latch and a latch receiver, and a leakage detection function part for detecting leakage;

An elliptical groove is provided on one surface of the plate-shaped latch receiver, and a link pin is detachably provided on the other surface of the latch receiver.

In addition, in the circuit breaker described above, an interlocking pin is provided on the latch receiver of the leakage detection unit, and one end of the interlocking pin is inserted into a groove of the latch receiver of the circuit breaker for wiring.

In addition, the above-mentioned circuit breaker includes a first wiring circuit breaker installed on the side surface of the above-mentioned leakage detection unit, and a second wiring circuit breaker installed on the side opposite to the above-mentioned leakage detection unit of the first wiring circuit breaker. A line circuit breaker; a linking pin is provided on the latch receiver of the above-mentioned first distribution circuit breaker, and the latch receiver of the second distribution circuit breaker is installed in the groove of the latch receiver. The action is transmitted to the spacer of the link pin above.

Furthermore, in the above-mentioned circuit breaker, the spacer is formed of a resin molded product, and the spacer is press-fitted into one of the grooves of the latch receiver.

The effect of the present invention is described below:

According to the present invention, since the circuit breaker and the switching mechanism portion of the leakage detection unit can be made common, the number of parts can be reduced.

Description of drawings

Fig. 1 is an internal configuration diagram showing an off state of a circuit breaker according to a first embodiment of the present invention.

Figure 2 is a side view of the circuit breaker.

Fig. 3 is a configuration diagram of the latch receiver of the present invention, wherein (a) is a side view of the latch receiver, and (b) is a perspective view of the latch receiver.

Fig. 4 is an enlarged view of the slot portion of the latch receiver shown in Fig. 1 .

Fig. 5 is a perspective view showing a switching mechanism unit and a current interrupting unit according to the present invention.

Fig. 6 is a perspective view showing a switching mechanism unit and a current interrupting unit according to the present invention.

Fig. 7 is an external perspective view showing an off state of an electric leakage detection unit.

Fig. 8 shows the relationship between the latch receiver and the link pin during leakage operation, wherein (a) is a diagram of the on state of the latch receiver, and (b) is a diagram of the disconnected state of the latch receiver.

Fig. 9 shows the relationship between the latch receiver and the link pin during overcurrent operation, wherein (a) is a diagram of the on state of the latch receiver, and (b) is a diagram of the disconnected state of the latch receiver.

The symbols are explained as follows:

1-Body shell

2-Operating handle

3-fixed contact

4- Movable contact

6-Latch (latch)

7-Latch receiver, 7d-Slot

8-Opening and closing mechanism department

21-link pin

22-Spacer

Detailed ways

Next, an embodiment of the present invention will be described with reference to FIGS. 1-9. In the following embodiments, various limitations are made on constituent elements, types, combinations, shapes, relative arrangements, etc., but these are merely examples, and the present invention is not limited thereto.

1 is an internal configuration diagram showing a circuit breaker according to a first embodiment of the present invention, such as a two-pole wiring circuit breaker in an off state, FIG. 2 is a side view of the circuit breaker, and FIG. 3 is a circuit breaker of the present invention. The structural diagram of the latch receiver, wherein (a) is a side view of the latch receiver, (b) is a perspective view of the latch receiver, and FIG. 4 is an enlarged view of the groove of the latch receiver shown in FIG. 1 .

In the above figure, reference numeral 1 is a resin body case which is divided into left and right parts consisting of a case and a cover, reference number 2 is an operation handle whose operation part protrudes from the body case 1 to the outside, and reference number 3 is a The fixed contact of the fixed contact 3a, the symbol 4 is a movable contact with a movable contact 4a at one end, the symbol 5 is a movable contact frame that maintains the insulation of the movable contact 4, and the symbol 8 is arranged without The opening and closing mechanism part constituted by the latch 6 and the latch receiver 7 between the illustrated frames, the latch receiver 7 is arranged so as to overlap the movable contact frame 5 .

Symbol 9 is a latch pin connecting the latch 6 and the operating handle 2, and symbol 11 is a connecting pin, one end of which is connected to the lower end of the latch receiver 7, and the other end is slidably held in a groove provided in the body shell 1. .

The latch 6 is rotatably supported by an unillustrated frame via a shaft 6 a, and is connected to one end of a latch pin 9 . The latch receiver 7 is rotatably supported by an unillustrated frame through a shaft portion 7b, and is energized by a spring 18 in a direction in which the latch 6 and the latch receiver 7 are fitted. The movable contact holder 5 is pivotally supported by the main body case 1 through a shaft portion not shown.

Fig. 3 is a structural diagram of the latch receiver. In this embodiment, an elliptical groove portion 7d is provided on one surface of the latch receiver 7 in a plate shape, and an interlocking pin 21 is detachably provided on the other surface of the latch receiver 7 . That is, in FIG. 3 , the latch receiver 7 is composed of a plate-shaped flat portion 7 a and a cylindrical portion 7 f. A shaft portion 7b is provided at the upper end of the flat plate portion 7a, and a spring housing portion 7c for housing the spring 18 is provided at the center of the flat plate portion 7a. Further, a groove portion 7d is provided below the shaft portion 7b of the flat plate portion 7a. The groove portion 7d is formed as a long groove having an elliptical shape, and the entrance side of the long groove is formed in a tapered shape.

On the back surface of the flat plate portion 7a where the groove portion 7d is provided, a cylindrical portion 7f extending in a direction opposite to the groove portion 7d is formed. The interlocking pin 21 shown in FIG. 5 is press-fitted into this cylindrical portion 7f. The interlocking pin 21 can be attached to and detached from the cylindrical portion 7f.

In FIG. 2, an elliptical opening 1b is provided at a position facing the groove 7d of the main body case 1, and one end of an interlocking pin 21 to be described later can be inserted into the groove from the outside of the main body case 1. Within 7 days. Also, an elliptical opening is provided at a position facing the cylindrical portion 7f of the main body case 1, and one end of the link pin 21 inserted into the cylindrical portion 7f protrudes from the main body case 1 to the outside. Symbols 1a, 1a are fitting holes provided in the main body case 1, and the circuit breaker and the leakage detection unit can be positioned and fixed by fitting the fitting holes 1a, 1a into the protrusions 10a, 10a of the leakage detection unit.

Fig. 4 is an enlarged view of the slot portion of the latch receiver shown in Fig. 1 . In FIG. 4, reference numeral 22 is a spacer detachably press-fitted into one of the long grooves of the groove portion 7d, and is made of a resin molded product such as rubber or plastic, for example. When a plurality of circuit breakers are connected to the leakage detection unit, the spacer 22 is inserted into the groove of the latch receiver of the circuit breaker separated from the leakage detection unit, and the circuit breaker separated from the leakage detection unit can be The overcurrent action is transmitted to the circuit breaker on the leakage detection unit side.

Returning to FIG. 1 , symbol 12 is an arc extinguishing device provided with multiple grid plates to extinguish the arc generated at the contact point, symbol 13 is an arc commutator plate arranged at the lower end side of the arc extinguishing device 12 , and symbol 14 is an arc extinguishing device. The terminal portion on the load side, symbol 15 is the terminal portion on the power supply side, the terminal portion 14 on the load side is electrically connected to one end of the arc commutation plate 13 , and is electrically connected to the movable contact 4 through a lead wire not shown.

Reference numeral 16 is a bimetal whose lower end is connected between one end of the arc commutator plate 13 and the terminal 14 on the load side. When an overcurrent flows, the upper end of the bimetal 16 bends to the right in FIG. 1 and passes through the connecting pin. 11. Pull the latch receiver 7 to the right, so that the engagement of the latch receiver 7 and the latch 6 is released, so that the movable contact 4 is separated from the fixed contact 3 .

In addition, reference numeral 17 is an overcurrent detection device for detecting an overcurrent such as a short-circuit current, and includes a plunger 17a and a coil 17b. One end of the coil 17b is connected to the fixed contact 3, and the other end of the coil 17b is connected to the terminal portion 15 on the power supply side. In addition, when an overcurrent such as a short-circuit current is detected, the plunger 17a protrudes toward the latch receiver 7, and by pressing one end of the latch receiver 7, the latch receiver 7 and the latch 6 are disengaged. Buckle, so that the movable contact 4 is away from the fixed contact 3.

Next, the configuration of the leakage detection unit will be described with reference to FIG. 7 .

Fig. 7 is an external perspective view showing an off state of an electric leakage detection unit.

In FIG. 7 , the leakage detection unit 100 accommodates the leakage detection function part for detecting leakage in the main body casing 10, the switching mechanism part shown in FIG. An operating handle 20 protruding from the outside.

The opening and closing mechanism includes the latch 6 shown in FIG. 1 , the latch receiver 7 , the connecting pin 9 for connecting the latch 6 and the operating handle, and the like.

The electric leakage detection function part may be composed of a zero-phase current transformer for detecting electric leakage and a tripping coil. The tripping coil is driven by a signal from the zero-phase current transformer to trip and drive the switching mechanism. In addition, the trip coil is electrically connected to the terminal portion via a conductor.

Reference numeral 30 is an electric leakage display part protruding outward when electric leakage is detected. Reference numeral 40 is a terminal cover provided with a plurality of conductors 41, through which the terminal part 25 of the leakage detection unit 100 and the terminal part 15 of the circuit breaker shown in FIG. 1 are electrically connected.

Reference numeral 10b is an elliptical opening of the main body case 10 that is provided at a position facing the cylindrical portion 7f of the latch receiver of the opening and closing mechanism, and one end of the interlocking pin 21 inserted into the cylindrical portion 7f is inserted from the main body case. The body 10 protrudes toward the outside. Reference numerals 10a, 10a denote protruding portions provided in the main body case 10 of the leakage detection unit, and fitted into fitting holes 1a, 1a provided in the main body case of the circuit breaker.

If leakage is detected, the leakage detection unit 100 drives the opening and closing mechanism through the tripping coil, the operating handle 20 moves from the on position to the off position, and the leakage indication part 30 protrudes from the upper part of the main body case 10 to the outside.

Next, the operation of the circuit breaker of the present invention will be described with reference to FIG. 1 .

In FIG. 1 , in the off state of the circuit breaker, the movable contact 4 is separated from the fixed contact 3 . Here, when the operating handle 2 is turned on from the off state of the circuit breaker, the fixed contact 3 and the movable contact 4 come into contact through the opening and closing mechanism portion 8 . Further, when the operating handle 2 is turned off from the on state of the circuit breaker, the movable contact 4 and the fixed contact 3 are separated by the opening and closing mechanism 8 .

When the above-mentioned circuit breaker is in the ON state, if an overcurrent flows through the main circuit, the upper end of the bimetal 16 is bent toward the right side in FIG. Pulling to the right side releases the fitting of the latch receiver 7 and the latch 6 of the opening and closing mechanism portion 8 , and separates the movable contact 4 from the fixed contact 3 .

Furthermore, if an overcurrent such as a short-circuit current flows through the main circuit, the overcurrent detection device 17 detects the overcurrent, and the plunger 17a protrudes toward the latch receiver 7, pushing one end of the latch receiver 7 to open and close. The fitting and releasing of the latch 6 and the latch receiver 7 of the mechanism part 8 causes the movable contact 4 to separate from the fixed contact 3 . Furthermore, an arc generated between the movable contact 4 a and the fixed contact 3 a is extinguished by the arc extinguishing device 12 .

Next, the operation when the above-mentioned circuit breaker is attached to the leakage detection unit will be described.

First, the operation when only one circuit breaker is attached to the leakage detection unit will be described.

As shown in FIG. 7 , the interlocking pin 21 is inserted into the cylindrical portion of the latch receiver 7 of the opening and closing mechanism portion of the leakage detection unit. In addition, the interlocking pin 21 is not inserted into the cylindrical part 7f of the latch receiver of the switching mechanism part of the circuit breaker, and the spacer shown in FIG. 4 is not inserted into the groove part of the latch receiver.

If the circuit breaker shown in FIG. 1 is installed on the side of the leakage detection unit 100 shown in FIG. 7, one end of the interlocking pin 21 protruding from the latch receiver of the leakage detection unit 100 is inserted into the switch of the circuit breaker. The groove portion 7 d of the latch receiver 7 of the mechanism portion 8 . Figure 8 shows the relationship between the latch receiver 7 of the circuit breaker and the interlocking pin 21 of the leakage detection unit during the leakage action, wherein (a) is a diagram of the on-state of the latch receiver, and (b) is a latch A diagram of the disconnected state of the accept piece.

As shown in FIG. 8, in the ON state of the circuit breaker, one end of the link pin 21 is located at the right end of the groove portion 7d of the latch receiver 7 of the circuit breaker. Then, when the leakage detection means detects the leakage, the opening and closing mechanism part of the leakage detection means operates, and the latch receiver of the leakage detection means moves to the open position. At this time, one end of the interlocking pin 21 moves from the position shown in FIG. 8(a) to the position shown in FIG. 8(b), so that the latch receiver 7 on the circuit breaker side moves to the right with the shaft 7b as the center, The fitting of the latch receiver 7 and the latch 6 is released. As a result, the movable contact 4 is separated from the fixed contact 3, and at the same time, the operating handle 2 indicates the off position. The operating handle 20 of the leakage detection unit also represents the disconnected position.

In this way, when the leakage detection unit detects the leakage, the circuit breaker can be disconnected by the leakage detection unit.

9 shows the operation when the circuit breaker detects an overcurrent. FIG. 9 shows the relationship between the latch receiver 7 of the circuit breaker and the interlocking pin 21 of the leakage detection unit during an overcurrent operation.

In FIG. 9 , when the circuit breaker detects an overcurrent, the switch mechanism of the circuit breaker operates. At this time, the latch receiver 7 on the circuit breaker side moves from the position in FIG. 9( a ) to the position in FIG. 9( b ) centering on the shaft 7 b. However, since the interlocking pin 21 is inserted into the elliptical groove 7d of the latch receiver 7 and only moves from the right end to the left end in the groove, the action of the latch receiver on the circuit breaker side is not transmitted to the latch of the leakage detection unit. The interlocking pin 21 of the lock receiver.

Therefore, when the circuit breaker detects an overcurrent, only the circuit breaker is turned off, and the leakage detection unit does not operate. In addition, the operating handle of the circuit breaker indicates the off position, and the operating handle of the leakage detection unit remains to indicate the on state.

As described above, when the leakage detection unit detects a leakage, the circuit breaker and the leakage detection unit operate, and when the circuit breaker detects an overcurrent, only the circuit breaker operates. Also, when a leakage is detected, the leakage detection unit and the operating handle of the circuit breaker indicate the off position, and when an overcurrent is detected, only the operating handle of the circuit breaker indicates the off position. Therefore, the position of the operating handle can be used to determine the cause Overcurrent disconnection, or disconnection due to leakage.

Next, the operation when a plurality of circuit breakers are attached to the side surface of the earth leakage detection unit will be described. In the cylindrical part 7f of the latch receiver 7 of the opening and closing mechanism part of an electric leakage detection means, as shown in FIG. 7, the interlocking pin 21 is inserted. Also, the interlocking pin 21 is inserted into the cylindrical part 7f of the latch receiver of the opening and closing mechanism part of the first circuit breaker installed on the side of the leakage detection unit, and the spacer shown in FIG. 4 is not inserted into the groove of the latch receiver. Section 7d.

Moreover, the 2nd circuit breaker is connected with the side surface of the 1st circuit breaker on the side opposite to an electric-leakage detection means. The interlocking pin 21 is not inserted into the cylindrical portion 7f of the latch receiver of the switching mechanism portion of the second circuit breaker, but the spacer 22 shown in FIG. 4 is inserted into the groove of the latch receiver.

And, in the state that the first circuit breaker and the second circuit breaker are installed on the side of the leakage detection unit, the interlocking pin 21 of the latch receiver of the leakage detection unit is inserted into the latch receiver 7 of the first circuit breaker. The interlocking pin 21 of the latch receiver of the first circuit breaker is inserted into the groove of the latch receiver of the second circuit breaker.

And, when the leakage detection unit detects the leakage, the opening and closing mechanism portion of the leakage detection unit operates, and the latch receiver of the leakage detection unit moves to the disconnected position. At this time, through the interlocking pin 21 of the leakage detection unit, the latch receiver of the first circuit breaker is activated, and through the interlocking pin 21 of the latch receiver of the first circuit breaker, the second circuit breaker is activated. The latch receiver operates to open the first circuit breaker and the second circuit breaker. Also, the operating handles of the first circuit breaker and the second circuit breaker indicate the off position, and the operating handle of the leakage detection unit also indicates the off position.

Next, when the first circuit breaker detects an overcurrent, the opening and closing mechanism of the first circuit breaker operates, and the latch receiver moves to the off position. At this time, only the interlocking pin 21 of the leakage detection unit moves in the groove of the latch receiver of the first circuit breaker, so the opening and closing mechanism of the leakage detection unit does not operate. Moreover, the opening and closing mechanism of the second circuit breaker makes the latch receiver of the second circuit breaker act through the interlocking pin 21 of the latch receiver 7 of the first circuit breaker, and the latch receiver and the latch Nesting trips, and the second circuit breaker also opens.

In this way, when the first circuit breaker detects an overcurrent, the first circuit breaker is turned off, and at the same time, the second circuit breaker is turned off, and the leakage detection unit does not operate. In this case, the operating handles of the first circuit breaker and the second circuit breaker indicate the OFF position, and at the same time, the operating handle of the leakage detection unit remains in the ON position.

When the second circuit breaker detects an overcurrent, the opening and closing mechanism of the second circuit breaker operates, and the latch receiver moves to the off position. At this time, the spacer 22 is inserted into the groove of the latch receiver, and the interlocking pin 21 of the latch receiver of the first circuit breaker is moved through the spacer 22, so that the latch of the first circuit breaker can be accepted. pieces of action. As a result, the fitting of the latch receiver and the latch of the first circuit breaker is released, and the first circuit breaker is disconnected. The action of the latch receiver of the first circuit breaker is not transmitted to the interlocking pin 21 of the latch receiver of the leakage detection unit, and therefore, the latch receiver of the leakage detection unit does not operate.

In this way, when the second circuit breaker detects an overcurrent, the second circuit breaker is turned off, and at the same time, the first circuit breaker is also turned off, and the leakage detection unit does not operate. In this case, the operating handles of the first circuit breaker and the second circuit breaker indicate the OFF position, and at the same time, the operating handle of the leakage detection unit remains in the ON position.

As described above, by inserting the spacer 22 into the groove of the latch receiver of the second circuit breaker, the movement of the latch receiver of the second circuit breaker can be transmitted to the latch receiver of the first circuit breaker through the spacer. Latch acceptor.

According to an embodiment of the present invention, an oval-shaped groove is provided on one side of the plate-shaped latch receiver, and at the same time, an interlocking pin is detachably provided on the other surface of the latch receiver, as a circuit breaker. A general-purpose opening and closing mechanism can be used with the opening and closing mechanism of the leakage detection unit.

Also, when installing a plurality of circuit breakers to the leakage detection unit, not only are interlocking pins and spacer parts added after the above-mentioned opening and closing mechanism, but also the operating handles of the circuit breakers and the leakage detection unit are operated in case of overcurrent. Unlike leakage operation, overcurrent operation and leakage operation can be distinguished from the handle position.

The embodiments of the present invention have been described above with reference to the drawings, but the present invention is not limited to the above-described embodiments. Various changes can be made within the scope of the technical thought of the present invention, and they all belong to the protection scope of the present invention.

Claims (4)

1. A circuit breaker, the leakage detection unit is installed on the side of the circuit breaker for wiring, and the circuit breaker is characterized in that: The above-mentioned circuit breakers for wiring include: operating handle; Fixed contacts, having fixed contacts; a movable contact having a movable contact that makes contact with/disengages from the fixed contact; and The opening and closing mechanism part is composed of a latch rotatably supported and a plate-shaped latch receiver that fits the latch in the ON state. When the fitting between the latch and the latch receiver is released , so that the above-mentioned movable contact is separated; The leakage detection unit includes an operating handle, an opening and closing mechanism part composed of the latch and a latch receiver, and a leakage detection function part for detecting leakage; An elliptical groove is provided on one surface of the plate-shaped latch receiver, and a link pin is detachably provided on the other surface of the latch receiver. 2. The circuit breaker of claim 1, wherein: A link pin is provided on the latch receiver of the leakage detection unit, and one end of the link pin is inserted into a groove of the latch receiver of the circuit breaker for distribution. 3. The circuit breaker of claim 2, wherein: including a first distribution circuit breaker installed on the side of the leakage detection unit, and a second distribution circuit breaker installed on the side opposite to the leakage detection unit of the first distribution circuit breaker; The latch receiver of the first distribution circuit breaker is provided with an interlocking pin, and is installed in the groove of the latch receiver of the second distribution circuit breaker to transmit the movement of the latch receiver to the above-mentioned link. Spacers for moving pins. 4. The circuit breaker of claim 3, wherein: The spacer is formed of a resin molded product, and this spacer is press-fitted into one of the grooves of the latch receiver.