CN1190814C - Thermal over-load relay - Google Patents

Abstract

A thermal overload relay. A tab 18a protrudes from a part of a window hole 19 of a display cover 18 in which a reset rod 16 protrudes, and the tab 18a is engages with a slot 16b of the reset rod 16 at a manual reset position to lock the reset rod 16 at the manual reset position. To hold the reset rod 16 in a press-in state at the automatic reset position after it is pushed and rotated, the tip of a screw driver is inserted to forcedly raise a slit 18b, to break off the tab 18a. Since the tab 18a is provided to a display cover 18 positioned on the front surface with the base of relay fitted, the break-off operation with the tab 18a as well as its result are easily confirmed.

Description

Thermal over-load relay

Technical field

The thermal over-load relay of the flexural property that the present invention relates to utilize the temperature of bimetal piece to rise to be produced particularly makes operating portion after the tripping operation be returned to the improvement of the resetting device of initial condition.

Background technology

Above-mentioned resetting device generally has and pushes the reposition lever that is installed in freely on the housing, by pushing this reposition lever, just can make the reversing device of the action of reversing along with tripping operation be returned to initial condition.This resets, and having resets at every turn carries out the hand-reset of push operation and automatically reversing device is returned to automatically reseting of initial condition by reposition lever is held in the state of pushing in advance after the bimetal piece cooling reposition lever, and they are changeable.At this moment, for example can not obtain in the electromagnetic contactor of self-hold circuit, if the reposition lever of hand-reset position switches to the position that automatically resets easily, so, even motor stops because of the tripping operation of thermal over-load relay, also can be created in the problem that bimetal piece cooling back motor is restarted.Therefore,, a kind of known technology is arranged: the pawl of interfering reposition lever is set,, just makes this pawl stir (folding り gets ら せ Ru) reposition lever being switched to from the hand-reset position when automatically reseting the position on housing as this countermeasure.

Figure 12 is the stereogram of prior art example that expression has the thermal over-load relay of above-mentioned pawl, and Figure 12 (A) is the state before pawl stirs, and Figure 12 (B) is the state after pawl stirs, and Figure 12 (C) is held in the state of pushing with reposition lever.In Figure 12 (A), from cover housing 1 above the demonstration lid 18 of (being in the front usually under the installment state) at dish be extruded with reposition lever 16 heads of flat column.Therefore, when pushing reposition lever 16 when overcome not shown returning spring after tripping operation, not shown reversing device just is returned to initial condition, and thermal over-load relay is by hand-reset.On the lid 23 of back side of shell, be formed with the pawl 23a that can stir (folding り gets the り possibility).The state after the front is stirred is prized pawl 23a in Figure 12 (B) expression with the front end of instruments such as Flathead screwdriver.Under this state, on lid 23, relatively form the square hole 23b of breach with the side of reposition lever 16.Under this state, when reposition lever 16 is pushed, can come in and go out in this side, form flexible snap-latch piece 16d and engage with square hole 23b, reposition lever 16 is retained the state of pushing.When producing tripping operation under this state, after the bimetal piece cooling, reversing device just automatically replies, and automatically resets.

Figure 13 represents different prior art examples, Figure 13 (A) expression reposition lever 16 push freely hand-reset position, Figure 13 (B) expression reposition lever 16 is retained the position that automatically resets of the state of pushing.Among Figure 13, reposition lever 16 is cylindric, from the hand-reset position original state of Figure 13 (A) push reposition lever 16, rotate 90 degree again, not shown snap-latch piece just engages with the part of housing 1 and is in the position that automatically resets.At this moment, pawl is not stirred in setting.

In this existing thermal over-load relay, structure shown in Figure 12 exists the back side that is positioned at housing 1 because of pawl 23a and is difficult to put into instrument, makes the very difficult problem of stirring of pawl 23a.In addition, structure shown in Figure 13 exists following problem: owing to only rotate reposition lever 16 reset mode is switched, so will produce such accident of having narrated when automatically reseting the position in case the product of hand-reset position is in.

Summary of the invention

Therefore, problem of the present invention is, is provided with a pawl, and it prevents to turn to from the hand-reset position of reposition lever the unexpected switching of the position that automatically resets, and utilizes stirring of this pawl to carry out switching operation towards the position that automatically resets easily.

For achieving the above object, thermal over-load relay of the present invention comprises: utilize the heating that electrical current produces and make the heating part of bimetal piece bending deflection; When the addendum modification of described bimetal piece surpasses setting, make reversing device do the counter-rotating action and operating portion that docking point switches, this operating portion has makes the described reversing device that reverses after moving be returned to the columned reposition lever of the preceding initial condition of counter-rotating, and, the reset mode of this reposition lever, can switch between the position pushing hand-reset position freely and be held in automatically reseting of the state of pushing by the rotating operation that begins from this hand-reset position, be characterized in, on the edge part of the fenestra that the demonstration that described reposition lever is come in and gone out is covered, be formed with the pawl that can stir, and be formed with groove with this pawl engagement vertically at the peripheral part of described reposition lever, if do not stir described pawl, the operation that can not rotate of then described reposition lever, and near the instrument that is provided with the root of described pawl inserts the slotted eye of usefulness, and the grooving that between the back side of described demonstration lid is formed with two ends with described pawl and described slotted eye, couples together, prize by the instrument front end is inserted in the described slotted eye, can stir described pawl easily.Thus, pawl is set by under the dish installment state, covering in the demonstration that is usually located at the front, so, even under the state that is installed on the dish, also can easily stir pawl, the switching of the mode that can trip.

In addition, also can implement chamfering, thus, can place the instrument that inserts in the slotted eye, and prize easily in the bight, the back side of the pawl lateral edge portion of described slotted eye.

On the other hand, be formed with expression in the head side of described reposition lever described manually or the pointer portion of the position that automatically resets, the height setting of this pointer portion become when described reposition lever carries out rotating operation, to be hidden in show cover below get final product.By forming pointer portion, the manual position display with the position that automatically resets of reposition lever becomes clear and definite, but by its height setting is become such as mentioned above, then need when rotating, reposition lever not avoid the portion that avoids of the demonstration lid fenestra of pointer portion, thereby dwindle the gap around the reposition lever, can prevent entering of foreign matter.In this case, the enforcement chamfering gets final product on the bight, the back side covered of the described demonstration that overlaps with the motion track of described pointer portion when described reposition lever rotates.Thus, rotate reposition lever even do not stir pawl, portion is held in the state of pushing with reposition lever with fenestra edge part engaging pointer, and pointer portion yet can not slide and engages because of chamfered section.

Description of drawings

Fig. 1 is the vertical view of demonstration cover of the thermal over-load relay of expression the invention process form.

Fig. 2 is the enlarged drawing of P portion among Fig. 1.

Fig. 3 (A), (B), (C) are respectively the cutaway views along A-A line, B-B line and C-C line among Fig. 2.

Fig. 4 is the inside front view of initial condition of the thermal over-load relay of expression the invention process form.

Fig. 5 is the enlarged drawing of the operating portion among Fig. 4.

Fig. 6 is the diagrammatic sketch of the operating portion tripped condition of presentation graphs 5.

To be expression remain on the diagrammatic sketch of state behind the position that automatically resets with the reposition lever of the thermal over-load relay of Fig. 4 to Fig. 7.

Fig. 8 is the stereogram of expression reposition lever.

Fig. 9 represents the state after the pawl that will show lid in the thermal over-load relay of Fig. 4 is stirred, and wherein, (A) is the stereogram of relay integral body, (B) is the enlarged drawing of its reposition lever part.

Figure 10 represents reposition lever in the thermal over-load relay of Fig. 4 is remained on state behind the position that automatically resets, wherein, (A) is the stereogram of relay integral body, (B) is the enlarged drawing of its reposition lever part.

Figure 11 represents not stir among Fig. 2 the pawl that shows lid and the vertical view of the reposition lever that desire rotates from the hand-reset position.

Figure 12 is the stereogram of the thermal over-load relay of the existing example of expression, wherein, (A) is state before the stirring of pawl, (B) is the state after the stirring of pawl, and (C) is the state after reposition lever is pushed.

Figure 13 is the stereogram of the thermal over-load relay of the different existing example of expression, wherein, (A) is the preceding state that pushes of reposition lever, (B) is the state after reposition lever pushes.

Embodiment

Below, according to Fig. 1～11 example of the present invention is described.At first, Fig. 4 is the front view that the back side lid of thermal over-load relay is unloaded, represents enclosure interior, and Fig. 5 is the enlarged drawing that omits the part of its operating portion.In Fig. 4 and Fig. 5, thermal over-load relay comprises: utilize the heating that electrical current produces and make the heating part 3 of bimetal piece 2 bending deflections; When the addendum modification of described bimetal piece 2 surpasses setting, make reversing device 4 do the counter-rotating action and operating portion 7 that docking point 5 and 6 switches.For this structure, action, now be described in detail as follows slightly.When bimetal piece 2 bendings, its upper end is indexed to the right-hand of Fig. 4.This action passes to release lever 9 by switching mechanism 8, and release lever 9 is a fulcrum and to counterclockwise rotating with axle 10.On the other hand, counter-rotary-ing plate 12 with an end be fulcrum and with V-shaped groove 11a (Fig. 5) collision that is fixed on supporting slice 11 1 ends on the housing 1, set up extension spring 13 between the other end of its other end and supporting slice 11.On counter-rotary-ing plate 12, be fixed with movable platen 14.

Like this, under the initial condition of Fig. 5, from the elastic force generation effect of extension spring 13, make counter-rotary-ing plate 12 to counterclockwise rotating, counter-rotary-ing plate 12 is run into and is stopped at shown position.Here, when release lever 9 because of the bending deflection of bimetal piece 2 when counter clockwise direction is rotated, this release lever 9 is just pushed the midriff 13a of extension spring 13 with projection 9a, make extension spring 13 to counterclockwise rotating.Thereupon, counter-rotary-ing plate 12 is also to counterclockwise rotating.At this moment, if when the addendum modification of bimetal piece 2 surpasses and the increase corresponding with it of the amount of spin of setting, release lever 9, extension spring 13 is just crossed from the dead point of clockwise direction to the counter clockwise direction conversion for the effect of counter-rotary-ing plate 12.In case cross this dead point, counter-rotary-ing plate 12 is just to counter-rotating counterclockwise.Fig. 6 represents this inverted status.

On the other hand, near release lever 9, in the front end of the fixed contact flat spring 5a of housing 1 the fixed contact 5b of normally closed contact 5 is installed in cantilever support,, travelling contact 5c is installed on counter-rotary-ing plate 12 under the initial condition of Fig. 5, contacting with fixed contact 5b.In addition, near on housing 1, the fixed contact 6b of normal opened contact 6 is installed at the front end of the fixed contact flat spring 6a of cantilever support, with the front end of the travelling contact flat spring 6c of fixed contact flat spring 6a almost parallel ground cantilever support, the travelling contact 6d relative with fixed contact 6a is installed.On fixed contact flat spring 6a, be bent to form the roughly flat spring 6e of the ヘ word shape of the participation aftermentioned homing action of orthogonal direction integratedly.Like this, when counter-rotary-ing plate 12 resembles when reversing above-mentioned, as shown in Figure 6, normally closed contact 5 (5b 5c) leaves, and normal opened contact 6 (6b, travelling contact flat spring 6c 6d) are subjected to the pushing of bar-shaped teat 14a of movable platen 14 and closed (tripping operation).Above-mentioned release lever 9, counter-rotary-ing plate 12, extension spring 13 etc. constitute reversing device 4.Reversing device 4 is made the operating current value of counter-rotating action, adjust dial 15 by rotation, thereby the position of the fulcrum shaft 10 of release lever 9 is adjusted to (for operating portion 7, can with reference to the specification of the special Willing of Japan Patent of another invention of present inventors flat 11-341776 number) like that shown in dotted line with giving off normal.

When cutting off the electrical current of electromagnetic contactor when thermal over-load relay generation tripping operation, bimetal piece 2 is cooled and is returned to initial condition.But, just not be not returned to initial condition if the reversing device 4 after the counter-rotating does not increase homing action.Therefore, above housing, be provided with reposition lever 16 highlightedly.Fig. 8 is the stereogram of expression reposition lever 16.Among Fig. 8, reposition lever 16 is the cylindric of band ladder, bloats to be formed with the leg-of-mutton pointer 16a of portion on a side of increased diameter head, at its opposition side, axially is formed with the groove 16b of triangular-section.In addition, on head, be provided with the slotted eye 16c that the instrument that is used for rotating the Flathead screwdriver and so on of reposition lever 16 can be inserted.In addition, on the minor diameter axial region of reposition lever 16, departing from the outstanding resilient snap-latch piece 16d of formation in 45 positions of spending with the 16a of pointer portion, departing from 90 positions of spending again with this snap-latch piece 16d, be formed with notch part 16e, it is cut into く word shape at the axial region front end by inclined plane and vertical guide.Like this, among Fig. 5, enter in the notch part 16e with the flat spring 6e of above-mentioned fixed contact flat spring 6a one.

Reposition lever 16 slides vertically freely and is installed in rotation on the housing 1, and the returning spring 17 that is constituted because of the compression spring that inserts axial region is subjected to protruding in the application of force of the direction of housing 1.Fig. 4～reposition lever 16 shown in Figure 6 is positioned at the hand-reset position, be subjected to returning spring 17 elastic force reposition lever 16 as shown in Figure 5, snap-latch piece 16d engages with the end difference 1a of housing 1 and is positioned in axially, and the demonstration lid 18 of head above sealing housing 1 is outstanding.Under the tripped condition of Fig. 6, when push operation reposition lever 16, the inclined plane of notch part 16e will be released with the flat spring 6e of fixed contact flat spring 6a one from notch part 16e.Thus, fixed contact flat spring 6a pushes movable platen 14 to the right by travelling contact flat spring 6c to right-hand bending.Its result, the counter-rotary-ing plate 12 of inverted status is subjected to clockwise rotation and drives, and when the dead point was crossed in the effect of extension spring 13, just counter-rotating was returned to initial condition.

Fig. 7 represents reposition lever 16 is remained on the position that automatically resets of the state of pushing.Will from Fig. 5 the hand-reset position make the position that automatically resets of Fig. 7, then in Fig. 5, the front end of the instrument of Flathead screwdriver and so on is inserted among the slotted eye 16c (Fig. 8) of reposition lever 16, after running into reposition lever 16, revolve to clockwise direction and to turn 90 degrees.Thus, snap-latch piece 16d engages with the end difference 1b of housing 1, is retained the state of pushing.Under this state, be pushed out from the notch part 16e of reposition lever 16 with the front end of the flat spring 6e of fixed contact flat spring 6a one, become the state on the axial region outer peripheral face that is shelved on reposition lever 16.Thus, in the initial condition (non-inverted status) of Fig. 7, the gap smaller between fixedly travelling contact 6b, the 6d of contact 6.Its result, even electrical current begins the counter-rotating action above setting, reversing device 4, travelling contact 6d also contacts with fixed contact 6b and can not stop to reverse before counter-rotary-ing plate 12 finishes counter-rotating.Therefore, when bimetal piece 2 coolings, reversing device 4 just automatically reverts to initial condition.

Here, Fig. 1 shows to cover 18 vertical view that Fig. 2 is the enlarged drawing of P portion among Fig. 1.In Fig. 1 and Fig. 2, show to cover to offer the outstanding fenestra 19 of head that can make reposition lever 16 on 18.Fenestra 19 is that circle shape behind the place ahead of circular arc is made on one side of square hole, and the circular arc edge the periphery arc surface of reposition lever head.And, the outstanding leg-of-mutton pawl 18a that is formed with the groove 16b engagement of reposition lever in an end margin portion on circular arc limit.This fenestra 19 connects the head of the reposition lever 16 that inserts the hand-reset position as shown in Figure 2, groove 16b and pawl 18a engagement, and the 16a of pointer portion faces mutually with a side in the bight, the place ahead of fenestra 19.In addition, in Fig. 1, show that cover 18 hole 20 is to make the outstanding usefulness of prod 21 (Fig. 4) of doing hand trip(ping) by pulling, and hole 22 makes adjustment dial 15 (Fig. 4) use towards top.

On the other hand, cover on 18 showing, to be provided with the instrument front end that is used for Flathead screwdriver and so on and to be inserted near the pawl 18a root slotted eye 18b.And, showing that cover 18 the back side is formed with a pair of grooving 18c, to couple together between the two ends with pawl 18a and slotted eye 18b.Here, Fig. 3 (A) is the cutaway view along A-A line among Fig. 2, the section shape of expression grooving 18c.In addition, Fig. 3 (B) and Fig. 3 (C) are respectively along the cutaway view of B-B line among Fig. 2 and C-C line, shown in Fig. 3 (B), bight, back side 18d to the pawl lateral edge portion of slotted eye 18b makes chamfering, and for example shown in Fig. 3 (C), bight, the back side 18e with the linear edge portion of the circular arc limit opposition side of fenestra 19 is made chamfering.

In Fig. 2, the reposition lever 16 of hand-reset position to be switched to the position that automatically resets, then from shown position reposition lever 16 is rotated 90 degree to clockwise direction (direction of arrow), the 16a of pointer portion makes with showing the opposing party bight of covering fenestra the place ahead of 18 and faces mutually shown in double dot dash line.At this moment, under this state, owing to reposition lever 16 does not rotate with the interference of pawl 18a, so pawl 18a is stirred.Its objective is, in the instrument front end insertion slotted eye 18b with Flathead screwdriver and so on, its front end is pried open.Thus, show and cover 18 that pawl 18a disconnects easily because of grooving 18c ruptures.Thus, reposition lever 16 is rotatable.At this moment, shown in Fig. 3 (B), because the bight 18d of slotted eye 18b is a chamfering, so the insertion of instrument 24 and to pry open be easy.Fig. 9 represents the thermal over-load relay after pawl 18a stirs, and Fig. 9 (A) is the stereogram of relay integral body, and Fig. 9 (B) is the enlarged drawing of its reposition lever part.Figure 10 represents the thermal over-load relay after reposition lever 16 rotates, and Figure 10 (A) is the stereogram of relay integral body, and Figure 10 (B) is the enlarged drawing of its reposition lever part.The effect of automatically reseting that the reposition lever 16 of position of automatically reseting is produced be narrated like that.

Yet, in Fig. 2, spend when automatically reseting the position when reposition lever 16 rotates 90 from the hand-reset position to the direction of arrow, the 16a of pointer portion marks arc track, in being decorated with the scope of oblique line with show that covering 18 overlaps.Therefore, when reposition lever 16 rotates, otherwise make the 16a of pointer portion and show that covering 18 collides, and then must avoid the front edge portion of fenestra 19 circular-arcly.But, in the diagram example, as shown in Figure 8, be provided with on the top of the 16a of pointer portion highly to the ladder of A, when depressing reposition lever 16, the upper surface of the 16a of pointer portion just be hidden in demonstration cover 18 below.Therefore, even the front edge portion of fenestra 19 is illustrated linearities, reposition lever 16 also not can with show that cover 18 collides and can rotate.Thus, if no ladder A, then can not produce the gap that is equivalent to the oblique line part that between the head side of the front edge portion of fenestra 19 and reposition lever 16, produced, thereby foreign matter just can not enter from this gap.

When on the 16a of pointer portion at reposition lever 16 ladder A (Fig. 8) being set, as shown in figure 11, do not rotate reposition lever 16 if do not stir pawl 18a, then rotate in the scope in the space of reposition lever 16 between pawl 18a and groove 16b, be hidden in and show that cover the sub-fraction that the 18 following 16a of pointer portion represent with Figure 11 bend engages with the edge part of fenestra 19, reposition lever 16 is held in the state that is pushed into, and the result has the danger of the generation misoperation that is in the position that automatically resets.Therefore, in the diagram example, shown in Fig. 3 (C), on bight, the back side 18e of the front edge portion of fenestra 19, implement chamfering.Therefore,, produce slip, do not engage because of there being chamfering even the 16a of pointer portion is engaged with bight 18e with the oblique line portion of Figure 11.Thus, in the hand-reset position, can prevent that reposition lever 16 is retained the misoperation of the state of pushing.

In this thermal over-load relay, if do not stir pawl 18a, then because reposition lever is not switched to the position that automatically resets from the hand-reset position, so the danger that can avoid the answer because of casual switching bimetal piece 2 after tripping operation that motor is restarted, and, because pawl 18a cover on 18 showing,, just look at and just can judge at a glance that pawl 18a has or not and stir so stir operation easily.In addition, owing near the root of pawl 18a, be provided with the slotted eye 18b that instrument inserts usefulness, simultaneously showing that covering 18 the back side is formed with the grooving 18c that couples together between the two ends with pawl 18a and slotted eye 18b, and on bight, the back side 18d of the pawl lateral edge portion of slotted eye 18b, make chamfering, so by with in the insertion slotted eye 18b such as Flathead screwdriver and can easily stir pawl 18a.

In addition, the 16a of pointer portion owing to the position that manually automatically resets in the formation expression of the head side of reposition lever 16, and the height setting of the 16a of this pointer portion becomes to be hidden in when reposition lever 16 rotating operations and is lower than demonstration and covers 18 the back side, so the gap of the fenestra 19 of the demonstration lid 18 of perforation insertion reposition lever 16 is less, and makes foreign matter be difficult to enter this gap.Also have, when rotating reposition lever 16 and implement chamfering on bight, the back side 18e of the edge part of the fenestra 19 that overlaps with the motion track of the 16a of pointer portion, therefore, engage with this back side chamfered section 18e at hand-reset position reposition lever 16, the possibility that by mistake is retained the state of pushing is less.

As mentioned above, adopt the present invention, can carry out the switching of reset mode easily and reliably to thermal over-load relay, and can improve the reliability of action.

Claims (4)

1. thermal over-load relay comprises: utilize the heating that electrical current produces and make the heating part of bimetal piece bending deflection; When the addendum modification of described bimetal piece surpasses setting, make reversing device do the counter-rotating action and operating portion that docking point switches, this operating portion has makes the described reversing device that reverses after moving be returned to the columned reposition lever of the preceding initial condition of counter-rotating, and, this reposition lever can switch between the position pushing hand-reset position freely and be held in automatically reseting of the state of pushing by the rotating operation that begins from this hand-reset position, it is characterized in that

On the edge part of the fenestra of the demonstration lid that described reposition lever is come in and gone out, be formed with the pawl that can stir, and be formed with groove with this pawl engagement vertically at the peripheral part of described reposition lever, if do not stir described pawl, the operation that can not rotate of then described reposition lever, and

Near the instrument that is provided with the root of described pawl inserts the slotted eye of usefulness, and the grooving that couples together between the back side of described demonstration lid is formed with two ends with described pawl and described slotted eye, prizes by the instrument front end is inserted in the described slotted eye, and described pawl is stirred easily.

2. thermal over-load relay as claimed in claim 1 is characterized in that, implements chamfering in the bight, the back side of the pawl lateral edge portion of described slotted eye.

3. thermal over-load relay as claimed in claim 1, it is characterized in that, be formed with expression in the head side of described reposition lever described manually or the pointer portion of the position that automatically resets, the height setting of this pointer portion become when described reposition lever carries out rotating operation, to be hidden in show cover below.

4. thermal over-load relay as claimed in claim 3 is characterized in that, implements chamfering on the bight, the back side of the fenestra edge part that the described demonstration that overlaps with the motion track of described pointer portion when described reposition lever rotates is covered.

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