JPH03201328A - Ratchet type charge mechanism of breaker - Google Patents

Abstract

PURPOSE:To cope with an existing condition by means of one plugging pawl for the purpose of cost down by providing the plugging pawl having a plurality of engaging part, which engage with a plurality of teeth of a ratchet gear. CONSTITUTION:A plugging pawl 19 has two pieces of engaging parts 19a, 19b which engage with two pieces of teeth 3a of a ratchet gear 3. When the ratchet 3 rotates and the plugging pawl 19 approaches the toothless part 18, firstly the engaging part 19a locks, next the engaging part 19b locks so as to get over the toothless part 18. That is, since the plugging pawl 19 has a plurality of engaging parts, which engage with a plurality of teeth of the ratchet gear 3 respectively, this plugging pawl 19 performs a function of plugging also in the toothless part 18 of the ratchet gear 3. Thereby, one plugging pawl can cope with an existing condition so that cost reduction can be achieved.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is a circuit breaker, for example, after charging a closing spring by operating a handle from the front of the circuit breaker housing, the current-carrying part is activated by giving a command. This relates to a ratchet-type charging mechanism for air circuit breakers that are closed and then opened by force.

[Prior Art] A conventional air circuit breaker of this type is constructed as schematically shown in FIGS. 4 and 5. Fig. 4 is a side view, and Fig. 5 is a view of Fig. 4 viewed from the left. In the figure, (1) is the casing, and the internal mechanism is shown in, for example, Japanese Patent Application Laid-Open No. 129720/1982. Therefore, the explanation will be omitted. (2) is a charging cam that is part of the internal mechanism, (3) is an electric drive ratchet, (4) is a manual drive ratchet, and (5) is the cam (2) and each ratchet (3), (4). ), (6) is the motor, (7) is the motor (6)
) is engaged with the ratchet (3). (8) is a manual charging handle, and (9) is a feed pawl driven by the handle (8), which engages the ratchet (4). (10) and (11) are a pair of conductors forming a part of the current-carrying section.

The charging cam is activated by driving the feed pawl (7) with the motor (6) to rotate the ratchet (3), or by driving the feed pawl (9) with the handle (8) and rotating the ratchet (4). Rotate and charge. Other detailed operations are shown in the above-mentioned publication, so their explanation will be omitted.

The ratchet type charging mechanism in Figures 4 and 5 is
FIG. 6 and FIG. 7 will be explained in detail. Figure 6 is an enlarged sectional view taken along the line ■-■ in Figure 4, and Figure 7 is a view of Figure 6 viewed from above, with the same parts as in Figures 4 and 5 designated by the same reference numerals. The explanation will be omitted. In the figure, (12)
is a main body frame installed within the housing (1), which rotatably supports the camshaft (5). Reference numeral (13) denotes a mechanism frame that is attached to the main body frame (12) with attachment screws (14), and a feed claw (7) driven by a motor (6) is rotatably attached thereto. (15) is a tension spring that urges the feed claw (7) in the direction of engagement;
16) are two reversal prevention claws (17) rotatably provided on the main body frame (12).
a push spring (18) that urges each in the meshing direction;
is the missing tooth part formed on the ratchet (3).

The mechanical part of the circuit breaker notifies the motor (6) of the completion of charging by operating the limit switch, but the motor (6)
6) continues to rotate due to inertia even after completion of charging, which is turned off by the limit switch, so that the feed claw (7) is operated. At this time, by positioning the feed claw (7) on the toothless part (18) of the ratchet (3) as shown in FIG.
) is prevented from being driven (overrun).

This is shown, for example, in Japanese Utility Model Application Publication No. 49-90869.

[Problems to be Solved by the Invention] In the ratchet type charging mechanism of the conventional circuit breaker as described above, since the ratchet (3) is provided with the toothless portion (18), the reversal prevention claw (16) is Since two reversal prevention claws (16) must be provided to prevent the ratchet (3) from reversing, there is a problem in that two reversal prevention pawls (16) are required, resulting in an increase in cost.

The present invention has been made to solve this problem, and an object of the present invention is to provide a ratchet type charging mechanism for a circuit breaker that can be used with a single anti-reverse claw, thereby reducing costs.

[Means to solve the problem]

In order to achieve the above object, a ratchet type charging mechanism for a circuit breaker according to the present invention includes a reversal prevention pawl having a plurality of engaging portions that respectively engage with a plurality of teeth of a ratchet gear.

[For further use] In this invention, since the reversal prevention pawl has a plurality of retaining portions that respectively engage with a plurality of teeth of the ratchet gear, the reversal prevention pawl can be used even in the toothless portion of the ratchet gear. Works to prevent reversal.

[Embodiment] An embodiment of the present invention will be described with reference to FIGS. 1 and 2. Figure 1 is a side view of the main part, Figure 2 (a).

(B) is a diagram illustrating that the reversal prevention claw in Figure 1 corresponds to the toothless part of the ratchet gear, and the same or equivalent parts as the above conventional one are given the same reference numerals and explanations are omitted. . In the figure, reference numeral (19) indicates a reverse rotation prevention claw, and two engaging portions (19a) that engage with two teeth (3a) of the ratchet gear (3).

(19b).

In this way, the ratchet (3
) rotates and the reversal prevention claw (19) approaches the toothless part (18), as shown in Figure 2 (A), the retaining part (
19a) and then, as shown in FIG.
is one tooth (3a), but the missing tooth part (1
When 8A) is two teeth (3a), three retaining parts (19a), (19b), (19c) are used as shown in Fig. 3.
It is sufficient to use a reversal prevention claw (19A) having a reversal prevention claw (19A).
By setting the number of retaining portions in 9), the same effects as in the above embodiment can be obtained.

[Effects of the Invention] As described above, according to the present invention, it is possible to cope with the problem with one anti-reverse claw, thereby achieving an effect of reducing costs.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a main part showing one embodiment of the present invention, Figs. 2 (a) and (b) are diagrams for explaining the operation of the anti-reverse claw, and Fig. 3 is a section showing another embodiment of the invention. 4 is a side sectional view showing a conventional circuit breaker, FIG. 5 is a view of FIG. 4 seen from the left, FIG. 6 is an enlarged sectional view taken along line VI-VI in FIG. 4, and FIG.
The figure is a view of FIG. 6 from above. In the figure, (3) is the ratchet, (3a) is the tooth of the ratchet gear, (7) is the feed pawl, (1st) is the toothless part, (
19) is a reverse rotation prevention claw, and (19a) and (19b) are engaging portions.

Claims (1)

[Claims] (1) A ratchet-type charging mechanism for a circuit breaker, in which the ratchet gear has a toothless portion and a feed pawl and a reversal prevention pawl engage, wherein the reversal prevention pawl has a plurality of teeth of the ratchet gear. A ratchet-type charging mechanism for a circuit breaker, characterized in that a plurality of engaging portions are provided which engage with each other.