JPH074752Y2 - Drawer type circuit breaker terminal connection device - Google Patents

Description

[Detailed description of the device] [Technical field to which the device belongs]

This invention is normally swingably attached to a plate-shaped terminal provided on a drawer type circuit breaker, and connects the plate-shaped terminal and a plate-shaped terminal provided on a fixed side, for example, a bus bar side so as to be able to come into contact with and separate from each other. Therefore, two contact strips, which are substantially strip-shaped and have contact portions formed on both end sides, are arranged inside the holding surface of the contact piece support having two holding surfaces facing each other in parallel so that the contact portions face each other. A plurality of pairs of contact pieces facing each other in parallel are arranged in parallel with the holding surface with a plate-like spacer interposed therebetween, and each contact is made in the vicinity of one side contact portion of each contact piece pair. A pair of contact pieces and spacers arranged in the plurality of rows are supported by two small-diameter shafts that penetrate through a large-diameter through hole provided at the same position in the row with the holding surface in the row direction, and each of the contact pieces is supported. The contact spring that presses the pair in the opposite direction of the contact part To connect the plate-shaped terminal of the drawer type circuit breaker inserted between the opposite contact portions of the contact piece pair and the plate-shaped terminal inserted from the other side of the contact piece pair to each other. Relates to a terminal connecting device.

[Prior art and its problems]

5 and 6 show an example of the structure of a conventional terminal connecting device. FIG. 5 shows a side view of this device and FIG. 6 shows a plan view. The U-shaped contact side support 1 having a narrow central side 1a has a substantially rectangular shape in which contact portions 2a, 2b are formed on both end sides inside two holding surfaces 1b, 1b facing each other in parallel. A pair of contact pieces 20 in which the contact pieces 2 are opposed to each other in parallel so that the contact portions 2a and 2b face each other vertically with the central side 1a interposed therebetween.
Are arranged in parallel with the holding surfaces 1b, 1b, and each pair of contact pieces is kept at a predetermined distance from each other by using the plate-shaped spacer 3 and the liner 17. Contact part of these contact piece pairs
A large-diameter through hole 10 is provided at the same position of the contact piece in the vicinity of 2b, and this through-hole has a small diameter together with the holding surfaces 1b and 1b of the contact piece support, the plate-like spacer 3, and the disc-shaped liner 17. Axis 5
Through which the contact piece pair is supported inside the contact piece support 1 with play between it and the shaft 5. Two pairs of these contact pieces constitute one pair, and a plate-shaped spring holder 4 having the same thickness as the liner 17 is inserted between the pair of contact pieces belonging to each pair, and a wedge 19 is driven into the lower end thereof. The pair of contact piece pairs support the lower end surfaces of the pair, and a contact spring 18 is inserted between the spring receiver 4a formed at the upper end of the pair of contact piece pairs and the upper end surface of the pair of contact pieces. Therefore, the plate-shaped terminal 7 provided on the drawer type circuit breaker (not shown) is inserted from the left side of the drawing between the facing contact portions of the contact piece pair, and the plate-shaped terminal 8 provided on the fixed bus bar side is on the right side. If this terminal connecting device is moved to the right along with the draw-out type circuit breaker so as to be inserted from above, the contact spring 18 is compressed by an amount corresponding to the thickness of these inserted terminals, and the required contact load is generated. By the way, the thickness of the plate-shaped terminals 7 and 8 varies depending on the rated energizing current and the rated short-circuit current of the circuit breaker.Therefore, the number of pairs of contact pieces depends on the maximum expected current. Inside the parallel holding surface of the one-sided support, it can be easily increased or decreased in response to a given electric current, but in order to change the distance between the two parallel shafts 5, in the conventional structure, As shown in FIGS. 1 to 12, it is necessary to change the pitch of the holes of the contact piece support 1 from p to p _A and p _B , and the pitch of the holes of the spacer 3 from p to p _A and p _B as well. Yes,
Since the sizes of the contact piece supports and the spacers are different depending on the pitches, it is necessary to prepare the contact piece supports and the spacers having various sizes according to the magnitude of the applied current. In FIGS. 5 and 6, 6 is
After the plate-shaped terminal 7 provided in the drawer type circuit breaker is inserted between the facing contact portions of the contact piece pair, the entire terminal connecting device can be swung vertically with respect to the terminal 7 via the contact piece support 1. It is a fitting for joining to.

[The purpose of the device]

This invention eliminates the disadvantages associated with the conventional structure described above, and only one kind of contact piece support or spacer is used to economically achieve all rated energization currents or rated short-circuit currents within the expected range. An object is to provide a compatible terminal connecting device.

[Key points of the device]

In this invention, two strip-shaped contact pieces having contact portions formed on both end sides are arranged so that the contact portions face each other inside the holding surface of a contact piece support having two holding surfaces facing each other in parallel. A plurality of pairs of contact pieces facing each other in parallel are arranged in parallel with the holding surface with a plate-like spacer interposed therebetween, and each contact is made in the vicinity of one side contact portion of each contact piece pair. The contact piece pairs and the spacers arranged in the plurality of rows are supported by the shafts having the diameters smaller than the diameters of the two through holes inserted from the outside of the holding surface in the through holes provided at the same positions of the pieces. A contact spring for pressing the contact portions in the opposite direction is provided with each of the contact piece pairs, and a plate-like terminal of a drawer type circuit breaker inserted between the opposite contact portions of the contact piece pair from one side of the contact piece pair. And the plate-shaped terminal inserted from the other side In the subsequent device, an insertion portion for closely inserting the shaft into the holding surface of the contact piece support and the plate-like spacer to fix the relative position of the shaft with respect to the holding surface faces the contact portion of the contact piece pair. The above-mentioned object is achieved by providing a plurality of them at intervals in the direction.

[Example of device]

1 and 2 show an embodiment of a terminal connecting device constructed based on the present invention. Here, FIG. 1 shows a side view of this apparatus, and FIG. 2 shows a plan view. The two parallel holding surfaces 11b, 11b of the contact piece support 11 having the spacing dimension set corresponding to the maximum rated energizing current or the maximum rated short-circuit current within the assumed range have the dimension t ₁ together with the current rating. From t ₂ , t ₃ to the thickness of the terminals 7,8, the shaft 5 penetrating through the center of the large-diameter through hole 10 of the contact piece 2 in the column direction in the column direction is widened corresponding to the contact portion of the contact piece pair. In order to allow dense insertion at a plurality of positions in the opposing direction, three circular through holes having a diameter substantially equal to the diameter of the shaft 5 at intervals of pitches P1 to P3 as shown in FIG. Vertically extending through holes 15 having a plurality of constrictions, which are formed by punching out by slightly shifting the positions and slightly overlapping each other, are provided above and below. Further, the plate-like spacer 13 supported by the shaft 5 is also provided with a notch 16 having the same shape as the through hole 15. Of course, this notch can also be a through hole in the shape of an elongated hole with a closed periphery like the through hole 15. The shaft 5 inserted into the through hole 15 is fixed at any of the positions of the pitches P1, P2 and P3 where the width of the through hole 15 is increased. Therefore, by changing the insertion part of the shaft 5, the contact piece pair is changed. Can be adjusted according to the thickness of the terminals 7 and 8 which varies depending on the stage of current rating. Therefore, multiple current rated connection devices can be formed with one type of contact strip support and spacer. The number of pairs of contact pieces in the present device may be increased or decreased according to the current rating, and the distance between the pairs of contact pieces in the row direction may be a distance pipe having an integer multiple of the thickness in the row direction of the contact pieces. Shall be kept. In this embodiment, the contact spring 4 is the same as the contact spring 4 even if the current rating is changed.
The amount of compression is made constant by changing the length of
The current carrying capacity per contact part is always kept constant, and the spring holder is the only member whose dimensions can be changed according to the current rating.However, this spring holder is also formed with a length that can support all current ratings, and the wedge 19 If the same number of holes into which holes are driven are provided at the same pitch as the insertion portions provided on the parallel holding surfaces of the contact piece support, a terminal connection device that can support all current ratings can be formed with only one type of component member. can do. On the other hand, if the spring holder is formed to have a length that can support all current ratings, the vertical dimension of the terminal connecting device will increase depending on the length of the spring holder. However, there is a case where an unnecessarily large space is required. Therefore, it is practical to divide the length of the spring holder into, for example, two stages so as to cope with a reduction in product types. Next, regarding the effect of cost reduction due to the small number of products, as can be seen from the figure, the contact piece support 11 is formed in an extremely simple U shape and it is possible to use inexpensive iron material, Even if the distance between the holding surfaces 11b and 11b is formed wide corresponding to the maximum value of the assumed current rating, the cost does not increase so much. In this case, it is necessary to use a non-ferrous material such as brass for the fitting 6 and the shaft 5, but the cost corresponding to the maximum difference in length due to the current rating of these members is due to the difference only in material cost. because there is,
The effect on the cost of the entire device is extremely small, and the effect on the loss side is substantially less than the effect of mass production and parts management that can be obtained when one type of component material meets the full current rating as in the present invention. It can be ignored.

[Effect of device]

As described above, according to the present invention, two parallel holding surfaces of the contact piece support and a plate-like spacer for keeping a distance between the contact piece pairs are provided with the contact piece or the contact piece pair between the two surfaces. Since the shaft to be supported on the contact part is densely inserted, and the relative positions of the shaft with respect to the holding surface and the plate-like spacer are fixed, the insertion parts are provided in the facing direction of the contact part by the number of expected current rating steps. With the exception of the spring holder, it is possible to construct a terminal connection device that supports all possible current ratings with only one type of contact piece support and plate spacer, and a large number of component members can be used for large numbers. Due to the effects of production and parts management, it is possible to economically provide the terminal connecting device.

[Brief description of drawings]

1 and 2 show an embodiment of a terminal connecting device constructed according to the present invention, respectively, a side view and a plan view of the device, and FIGS. 3 and 4 respectively show a holding surface and a plate of a contact piece support. 5A, 5B, 6A, 6B, 6C, 6D, 6E, 6F, 6F, 6G, 6H, 6E, 6F, and 6E are explanatory views showing examples of the shape of the insertion portion provided in the spacers, FIG. 5 and FIG.
Figures 9 to 10 and Figures 10 to 12, respectively,
In the conventional terminal connecting device, the contact piece support and the plate-like spacer showing that the size of the member differs depending on the current rating due to the center distance between the two shafts supporting the contact piece pair, and therefore a separate member is required. FIG. 1,1A, 1B, 11: Contact piece support, 2: Contact piece, 2a, 2b: Contact part, 3,3A, 3B, 13: Spacer, 5: Shaft, 7,8: Terminal, 10: Through hole, 18 : Contact spring, 20: One pair of contacts.

Claims (1)

[Scope of utility model registration request] 1. A contact strip, which has two strip-shaped contact strips having contact strips formed on both ends thereof, faces each other on the inside of the contact strip support having two parallel holding strips. As described above, a plurality of pairs of contact pieces, which are opposed to each other in parallel, are arranged in parallel in parallel with the holding surface with a plate-like spacer interposed therebetween, and each contact piece pair is provided in the vicinity of one side contact portion. A pair of contact pieces and spacers arranged in a plurality of rows are supported by shafts having diameters smaller than the diameters of the two through holes inserted from the outside of the holding surface in through holes provided at the same positions of the contact pieces. And a contact spring for pressing each of the contact piece pairs in the opposite direction of the contact portion is provided, and a plate shape of a drawer type circuit breaker inserted between the opposite contact portions of the contact piece pair from one side of the contact piece pair. The terminal and the plate-shaped terminal that is inserted from the other side In the subsequent device, an insertion portion for closely inserting the shaft into the holding surface of the contact piece support and the plate-like spacer to fix the relative position of the shaft with respect to the holding surface faces the contact portion of the contact piece pair. A terminal connection device for a drawer type circuit breaker, wherein a plurality of terminal connection devices are provided at intervals in a direction.