JPS6256613B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a limit switch.

Conventionally, this type of limit switch has a structure as shown in FIG. That is, the upper end of the push button 3 of the switch 2, which is a so-called micro switch provided in the container body 1, is inserted into the cylindrical housing part 7 that is integrally provided in the upper part of the container body 1, and the push button 3 is inserted into the cylindrical housing part 7. It was adapted to be pushed downward by a pushing body 8 driven by a plunger 6 installed therein. That is, when a downward load F is applied to the plunger 6, the plunger 6 moves downward against the return spring 9 and pushes down the pusher 8 while pushing down the OT absorption spring 10 provided on the upper part of the pusher 8. Then push button 3 of switch 2 to drive switch 2. Further, when the operation of the switch 2 is completed, the outward flange 11 provided on the outer periphery of the upper end of the pusher 8 collides with the inward flange 12 provided on the lower opening edge of the cylindrical storage section 7, and the pusher 8 then moves forward. It stops moving. Furthermore, if a load is applied to the plunger 6 even after the movement has been completed, the OT absorbing spring 10 will further bend, absorbing OT (the distance traveled by the actuator from its operating position to its operating limit position). However, such conventional devices have the disadvantage of having a large number of parts, making the assembly complicated, and increasing the cost.Moreover, there is a pusher 8 at the bottom of the plunger 6 and an OT absorbing spring 10.
In addition to necessarily requiring several parts such as the following, the cylindrical storage section 7 is required, which makes it difficult to downsize.

The present invention has been made in view of the above-mentioned drawbacks, and its purpose is to provide a first bullet and a second bullet inside the container.
To provide a limit switch which has a structure where only a bullet is provided and can take a relatively large plunger OT regardless of the small operating stroke of the built-in switch.

The present invention will be explained below with reference to Examples. FIGS. 2 to 5 and FIGS. 6a and 6b are drawings showing a first embodiment of the present invention. A switch 2, which is a so-called micro switch, is sandwiched between inward protrusions 13 that protrude from the inner walls on both sides of the container body 1, and is fixed with a fixing pin 14. Of course, the inward protrusion 13 may be used for clamping. In the figure, reference numeral 4 denotes a first bullet, and this bullet is formed from a T-shaped leaf spring body, and its central piece 4a
The rear end is buried in the upper inner wall of the rear end of the container body 1 by press-fitting or simultaneous molding, and the free end side hangs down as shown in Figure 4 and has a downward biasing force. . In the figure, reference numeral 5 denotes a second bullet, and this bullet 5 is formed from a U-shaped leaf spring body.
Embedded in the upper inner wall of the rear end of the vessel body 1 on the fixed side by press-fitting or simultaneous molding, so that both side pieces 5a are parallel to the center piece 4a of the bullet strip 4, and both side pieces 5a are on the inner wall side of the vessel body 1. The outer surface of the switch 2 and the outer surface of the switch 2 should not touch the outer surface of the switch 2.
and the inner wall side of the Both side pieces 5a of this bullet 5 are in a slightly upwardly facing state and have an upward biasing force. From the state shown in FIG. 4, a load in the A direction is applied to both sides 5a of the bullet 5, and a load in the B direction is applied to the center piece 4a of the bullet 4.
The lower surfaces of protruding pieces 4b protruding from both sides of the tip of the center piece 4a and the upper surfaces of both side pieces 5a are brought into elastic engagement with each other by intersecting the protruding pieces 4b. In this state, the lower surface of the center piece 4a lightly contacts the upper end of the push button 3 of the switch 2. On the other hand, a hole 15 is provided in the body 1 above the tip of the center piece 4a, passing through the inner and outer walls, and the head of the plunger 6 passes through the hole 15 so as to be able to slide upwardly and downwardly. The lower part of the plunger 6 is divided into two parts in a U-shape, and each leg piece 6a is in light contact with the upper surface of both side pieces 5a. Here, the central piece 4a exerts a force pushing down both side pieces 5a of the bullet 5 via the projecting piece 4b of the bullet 4.
F ₂ , the force of the pieces 5a on both sides pushing up the protruding piece 4b is F ₁
Then, set so that F ₁ ≧F ₂ . This pushing force is called initial tension. Also, force _F2 is set to be greater than OF of switch 2.

When a downward load is applied to the head of the plunger 6, the leg pieces 6a of the plunger 6 push down both side pieces 5a of the bullet 5, and the force that causes the side pieces 5a to push up the projecting piece 4b of the bullet 4. decreases, the bullet 4 that had been elastically compressed by the pressing force of the side piece 5a
The initial tension F ₂ of the central piece 4a acts to push the push button 3 of the switch 2 and drive the switch 2 to open and close. When the operation of the switch 2 is completed, the central piece 4a stops moving. <In this case, it may be applied to the outer grain of the switch 2, or it may be stopped by protruding from the inner wall of the container body 1. >If a load is further applied to the plunger 6 even after the movement of the central piece 4a has stopped, the bullet 5
As shown in FIGS. 6a and 6b, only the side pieces 5a of the switch 2 are curved in the way the outer surface of the switch 2 is assembled. Therefore, since the bending of both pieces 5a can be ensured regardless of the stroke of the switch 2 (the stroke of the built-in switch 2 is often smaller than the stroke of a limit switch), the OT of the limit switch can be increased.

7 to 9 are diagrams showing a second embodiment of the present invention, in which the central piece 4a of the bullet 4 and the side pieces 5a of the bullet 5 are lengthened. The life span of each bullet 4, 5 is extended by providing a relatively large margin for stress, and the center piece 4a
The rear half and the rear halves of both side pieces 5a are bent downward, and the lower end of the center piece 4a and the base piece 5b are buried in the inner wall of the lower part of the vessel body 1, respectively, and the length of the hanging part is as shown in FIG. There is more leeway than in the example. The relationship between the projecting piece 4b of the central piece 4a of the bullet 4 and the side pieces 5a of the bullet 5, the structure of the operating plunger 6, and the fixing structure of the switch 2 are the same as in the embodiment shown in FIG. Further, FIG. 8 shows the state before the bullets 4 and 5 are set, and FIG. 9 shows the state after they are set.

FIGS. 10 to 12 show a third embodiment of the present invention, and this embodiment is designed to increase the length of the bullets 4, 5 to disperse stress and extend the life of the bullets 4, 5. The first bullet 4 and the second bullet 5 are overlapped and curved into a C-shape, one end of which is buried in the center of the inner wall of the front end of the vessel body 1, and the tip of the bullet 4 is shaped into a T-shape. At the same time, the tip of the bullet 5 is divided into two parallel pieces 5 on both sides.
A, and the engagement relationship between the side pieces 5a of the bullet 5 and the central piece 4a and protruding piece 4b of the T-shaped tip of the bullet 4 is constructed in the same manner as in the embodiment shown in FIG. There is.
The lower portions of these bullets 4 and 5 are provided with window holes 16 that can be penetrated up and down, respectively.
The side body part of the switch 2 provided in the container body 1 is loosely fitted into the inside, and the push button 3 of the switch 2 is inserted into the center piece 4 of the bullet strip 4.
a It is in contact with the lower surface. Of course, both pieces 5a, 5a are movable upward and downward on the sides of the switch 2. Further, the plunger 6 has the lower ends of both leg pieces 6a in contact with the upper surfaces of both side pieces 5a of the bullet 5, respectively, as in the embodiment shown in FIG. Thus, when a downward load is applied to the head of the plunger 6, it will operate in the same manner as the embodiment shown in FIG. 11 shows the condition before the bullets 4 and 5 are set, and FIG. 12 shows the condition after they are set.

13 to 15 show a fourth embodiment of the present invention. In this embodiment, the base piece 5b of the second bullet strip 5 formed in a U-shape is embedded in the inner wall of the rear end of the vessel body 1, T
The rear end of the center piece 4a of the letter-shaped bullet strip 4 is buried in the front inner wall of the container body 1, and the lower surface of the projecting piece 4b on both sides of the opposing center piece 4a and the upper surface of both side pieces 5a are connected to each other. Resiliently engage. The switch 2 is fixed to the container body 1 in the same manner as in the embodiment shown in FIG. 2, and its push button 3 is in contact with the lower surface of the central piece 4a. Also plunger 6
Similarly to the embodiment shown in FIG. 2, the lower ends of both leg pieces 6a are brought into contact with the upper surfaces of both side pieces 6a. 14 shows the state before the bullets 4 and 5 are set, and FIG. 15 shows the state after they are set. However, in this embodiment, by setting the fulcrums of the both sides 5a of the bullet 5 and the fulcrum of the center piece 4a of the bullet 4 at different positions, the center of the bullet 4 can be Since the processing, size, material, etc. of the piece 4a can be changed, processing the shape of the bullet 4 becomes relatively easy.

16 to 18 show a fifth embodiment of the present invention, in which the rear halves of both side pieces 5a are bent downward, and the rear half of the center piece 4a is bent downward to form the respective The lower end is buried in the inner wall of the lower part of the vessel body 1, and the plate lengths of the bullets 4 and 5 are made relatively long so that stress can be dispersed. In addition, Figure 17 shows the 18th stage before setting bullets 4 and 5.
The figure shows the state after setting.

19 to 21 illustrate the embodiment of the invention shown in FIG.
The rear end is embedded and fixed in the upper rear end inner wall of the vessel body 1,
From this embedding and fixing position, the rear end of the second bullet 5 is embedded and fixed in the inner wall of the lower rear end of the lower part of the vessel body 1, and is curved in a C shape from the middle, and the lower surface of the parallel side pieces 5a provided at the tip. and the center piece 4a of the bullet 4, and the projecting pieces 4b on both sides of the tip.
The lower part of the switch 2 is loosely fitted into the window hole 16' in the lower part of the bullet 5, and the upper part has both side pieces 5a pushed downward. The both side pieces 5a are arranged so as not to come into contact with each other on both sides. However, in this embodiment, the lower surface of the center piece 4a of the bullet strip 4 is brought into light contact with the upper end of the push button 3 of the switch 2, the lower ends of both leg pieces 6a of the plunger 6 are brought into light contact with the upper surface of both side pieces 5a of the bullet strip 5, and the second The operation is similar to that of the embodiment shown in the figure, and the plate length of the second bullet 5 is increased to distribute stress and extend the service life.
The processing, material, etc. of the bullet 4 can be changed apart from the fulcrum of the bullet 5.

FIG. 22 shows a seventh embodiment of the present invention, which includes a first bar 4 having a downward biasing force.
and a second bullet 5 having an upward biasing force are arranged side by side at the free end of the first bullet 4 and the lower surface of the horizontal piece 4c and the upper surface of the free end of the second bullet 5. are elastically engaged with each other, and a push button 3 of the switch 2 is attached to the bottom surface of the tip of the horizontal piece 4c.
and the lower surface of the plunger 6 is brought into contact with the upper surface of the bullet 5. When the plunger 6 is pushed down, the horizontal piece 4c pushes and drives the push button 3 with its initial tension _F2 , and the plunger 6 When both are pressed down, the tips of the bullets 5 can pass downwards without contacting the front end of the switch 2.
The same operation as the embodiment in FIG. 2 can be obtained.

FIG. 23 shows an eighth embodiment of the present invention, in which the second bullet 5 is formed of a linear spring material, and the end portion is embedded and fixed in the inner wall on the front end side of the vessel body 1. The upper surface of the free end thereof and the lower surface of the free end of the plate-shaped first bullet 4 having a downward biasing force whose end is embedded and fixed in the inner wall on the rear end side of the vessel body 1. are brought into elastic contact with each other, and the bullet 5 is made by the plunger 6.
When the button 3 of the switch 2, which is in contact with the lower surface of the free end of the bullet 4, is pressed downward, the initial tension of the bullet 4 is
It is designed to be driven at F ₂ , and when the plunger 6 is further pushed down after the push-drive, the bullet 5 is pushed downward without the tip of the bullet 5 coming into contact with the switch 2. ing. FIG. 24 shows another example of the bullet 5.

The present invention includes a switch housed in a container body, and a first button whose one end is fixed to the inner wall of the container and whose other free end is pressed to open and close the push button of the switch using an accumulated elastic force.
one end of the bullet is fixed to the inner wall of the container, the other free end is engaged with the free end of the first bullet, and the first bullet is elastically retracted to the return position of the push button of the switch. a second bullet that slidably penetrates the inner and outer walls of the container body, and is configured to oppose the free end of the second bullet and release the engagement with the first bullet. Second
and a plunger that presses and drives the free end of the bullet, so when the plunger is pushed, the second bullet deflects and releases the engagement of the first bullet. The built-in switch push button is driven by the accumulated elastic force, and the built-in switch push button can be operated with a constant force regardless of the stroke of the plunger, and the operating stroke of the built-in switch is small. The second bullet allows for a relatively large OT regardless of the stroke of the built-in switch, and it is easy to assemble the first and second bullets into the body. It has the excellent effect of being able to construct an OT absorption mechanism (conventionally, it required a pushing body, a return spring, an OT absorption spring, and an outward or inward flange as a stopper).

[Brief explanation of the drawing]

Fig. 1 is a diagram of a conventional example, Fig. 2 is a side sectional view of the first embodiment of the present invention, Fig. 3 is a front sectional view of the same, and Fig. 4 is an enlarged view of the main part of the same before both bullets are set. Perspective view,
FIG. 5 is an enlarged perspective view of the main part after both bullets are set as above, FIGS. 6 a and b are explanatory views of the same as above, FIG. The figure is an enlarged perspective view of the main part before both bullets are set, FIG. 9 is an enlarged perspective view of the main part after both the bullets are set, and FIG. 10 is a side sectional view of the third embodiment of the present invention. , Figure 11 is an enlarged perspective view of the main part before both bullets are set, Figure 12 is
The figure is an enlarged perspective view of the main part after both bullets are set as above, FIG. 13 is a side sectional view of the fourth embodiment of the present invention, and FIG.
Figure 4 is an enlarged perspective view of the main part before both bullets are set as above.
Fig. 15 is an enlarged perspective view of the main part after both the above bullets are set, Fig. 16 is a side sectional view of the fifth embodiment of the present invention, and Fig. 17 is an enlarged view of the main part before both the above bullets are set. FIG. 18 is an enlarged perspective view of the main part after both bullets are set as above, FIG. 19 is a side view of the sixth embodiment of the present invention, and FIG. 20 is a main part before both bullets are set as above. FIG. 21 is an enlarged perspective view of the main part after both bullets are set as above, FIG. 22 is an enlarged perspective view of the main part of the seventh embodiment of the present invention, and FIG. 23 is an enlarged perspective view of the main part of the seventh embodiment of the present invention. FIG. 24 is an enlarged perspective view of the main part of the embodiment No. 8, and FIG.
1 is an enlarged perspective view of another example of the bullet, 1 is the vessel body, 2
is a switch, 3 is a push button, 4 is a first bullet, 5 is a second bullet, and 6 is a plunger.

Claims (1)

[Scope of Claims] 1. A switch housed in the container body, and a first bar whose one end is fixed to the inner wall of the container and whose other free end is used to press and open/close a push button of the switch using accumulated elastic force. and a second bullet having one end fixed to the inner wall of the container and the other free end engaging the free end of the first bullet, and elastically retracting the first bullet to the return position of the push button of the switch. a second bullet that slidably penetrates the inner and outer walls of the vessel body, faces the free end of the second bullet, and releases the engagement with the first bullet. A limit switch comprising a plunger that presses and drives the free end of a bullet. 2. The first bullet is formed from a T-shaped leaf spring body, and the rear end of its center piece is fixed to the inner wall of the end of the vessel, and the second bullet is formed from a U-shaped spring body, and the second bullet is formed from a U-shaped spring body. Both side pieces are arranged in parallel on both sides of the center piece of the first bullet,
A base piece with the rear ends of both side pieces connected to the front edges of both sides is fixed to the inner wall of the end of the vessel body on the fixed side of the center piece, and the lower surfaces of the projecting pieces on both sides of the tip of the center piece and the upper surfaces of the tips of both sides are elastically connected to each other. Claims characterized in that the lower surface of the two leg pieces that are in contact with each other and are divided into two on both sides of the lower part of the plunger are in contact with the upper surface of the side pieces, and the lower surface of the center piece is in contact with the upper end of the push button of the switch. The limit switch described in paragraph 1. 3. The first bullet is formed of a T-shaped leaf spring body, the rear half of the central piece is bent downward at a substantially right angle, and the lower end is fixed to the lower inner wall of the vessel body, and the second bullet is formed by a T-shaped leaf spring body. The strips are formed of U-shaped spring bodies, and the rear halves of both side pieces are bent downward at a substantially right angle to be arranged in parallel on both sides of the center side of the first bullet strip, and the rear ends of both side pieces are bent downward at a substantially right angle. The base pieces connected to the front edges of both sides are fixed to the inner wall of the lower part of the container body on the side where the center piece is fixed, and the lower surfaces of the projecting pieces on both sides of the tip of the center piece and the upper surfaces of the tips of both sides are elastically engaged with each other, and the base pieces of the plunger are connected to each other. 2. The limit switch according to claim 1, wherein the lower surface of the leg piece divided into two on both sides of the lower part is in contact with the upper surface of the both side legs, and the lower surface of the center leg piece is in contact with the upper end of the push button of the switch. 4 The first bullet stripe and the second bullet stripe, each made of a leaf spring body, are overlapped and bent into a C shape with the second bullet stripe on the inside, and one lower end of both bullet stripes is The central piece of the T-shaped free end of the first bullet is fixed to the inner wall of the body end part, and the center piece of the T-shaped free end of the first bullet is arranged between the parallel side pieces provided at the free end of the second bullet. The lower surface and the upper surfaces of both sides are elastically engaged with each other, and the push button of the switch, which is loosely fitted into the window hole provided in the lower part of both bullets, is brought into contact with the lower surface of the center piece, and the lower sides of the plunger are brought into contact with each other. Claim 1, characterized in that the lower surface of the two-pronged leg is in contact with the upper surface of both sides of the leg.
Limit switch described in section. 5. The first bullet is formed by a T-shaped leaf spring body, and the rear end of the center piece is fixed to the inner wall of one end of the container, and the second bullet is formed by a U-shaped spring body, A base piece with the rear ends of both sides connected to the front edges of both sides is fixed to the inner wall of the end of the container body on the side opposite to the fixing side of the center piece, and the lower surface of the projecting piece on both sides of the tip of the center piece and the upper surface of the tip of the both sides are fixed. are elastically engaged with each other, the lower surfaces of the leg pieces divided into two on both sides of the lower part of the plunger are in contact with the upper surfaces of the both legs, and the lower surface of the center piece is in contact with the upper end of the push button of the switch. A limit switch according to claim 1. 6 The first bullet is formed of a T-shaped leaf spring body, the rear half of the central piece is bent downward at a nearly right angle, the lower end is fixed to the lower inner wall of the container body, and the second The base piece is formed of a U-shaped spring body, the rear half of each side piece is bent downward at a substantially right angle, and the rear ends of both side pieces are connected to the front edges of both sides. and fixed to the lower inner wall of the container on the opposite side, the lower surfaces of the protrusions on both sides of the center end and the upper surfaces of the ends of the both sides are elastically engaged with each other, and the legs are divided into two on both sides of the lower part of the plunger. 2. The limit switch according to claim 1, wherein the lower surface of one side is in contact with the upper surfaces of said both sides, and the lower surface of said central piece is in elastic contact with the upper end of a push button of the switch. 7. The first bullet is formed of a T-shaped leaf spring body, the rear end of the center piece is fixed to the upper side of the inner wall of the end of the container, and the second bullet made of the leaf spring body is bent into a C-shape. The lower end is fixed to the inner wall of the end of the vessel below the center piece fixing position, and the parallel protrusions formed on the upper surface of the tip of the side piece and on both sides of the tip of the center piece are formed at the free end of the second strip. The push button of the switch, which is loosely fitted into the window hole provided in the lower part of the second bullet, is brought into contact with the lower surface of the center piece, and the push button of the switch is brought into contact with the lower surface of the center piece, and the push button of the switch is loosely fitted into the window hole provided in the lower part of the second bullet. 2. The limit switch according to claim 1, wherein the lower surface of the two-pronged leg is in contact with the upper surface of both legs. 8. The limit switch according to claim 1, wherein one of the bullets is made of a wire spring material and the other bullet is made of a leaf spring.