JPH0113263Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a piezoelectric device used in igniters of gas appliances and the like.

Conventionally, this type of device has a rotary plate b that is slidably engaged with an operating shaft a in the axial direction, and a rotation locus of a claw c at the tip of the rotary plate b, as shown in FIG. 1, for example. It is equipped with a hammer d facing the hammer d, and a piezoelectric element e in the front facing the hammer d, and when the operating shaft a is driven in the counterclockwise direction in the drawing, the claw part c is attached to the hammer d. When the hammer d comes into contact with the front end face f, the hammer d is moved backward against the spring g, and then the claw part c is removed from the front end face f, and the hammer d is moved forward by the spring g. A device in which the piezoelectric element e is struck and a high voltage is generated is known. When the claw part c comes into contact with the circumferential side of the hammer d when the operating shaft a is returned clockwise, as shown in FIGS. 2 and 3. As shown in FIG. 4, there is also known a device in which the claw portion c is guided by an arcuate surface or the like and pushed upward, and is returned to the front after climbing over the hammer d (Japanese Utility Model Publication No. 8221/1983).

However, in this case, the front end face f of the hammer d
Since the peripheral edge shape is oblique to the plane, immediately before the claw part c comes off from the front end face f, the claw part c and the front end face f are separated from each other as shown in FIG. The point contact is made at the corner h of the leading edge of the spring g, and the elastic force of the spring g acts intensively on this point contact area, which tends to cause wear due to the contact parts being twisted together. According to , the claw c comes to come off the front end face f quickly, and the hammer d
This is accompanied by the inconvenience of not being able to apply sufficient urging force to the Furthermore, Publication No. 16457 of 1982 or Publication No. 16457 of 1983-
By locking a pawl on the diameter line of the hammer as seen in 21505, or by providing a protrusion on the side of the hammer and having the pawl act on it, as in Japanese Utility Model Application No. 52-8573. A device is known in which the above-mentioned contact portions are less likely to be strained.

However, in all of these devices, the surface facing the tip of the claw is a plane along the circumferential direction of the hammer, and the moving speed of the hammer is compared to the speed at which a person moves the claw by operating the shaft. However, because it is extremely large,
Even after the claw part is removed from the front end of the hammer, it continues to contact the side surface of the hammer, which inconveniently reduces the moving speed of the hammer, that is, the impact when striking the piezoelectric element.

The purpose of the present invention is to provide a device that eliminates such inconveniences, and includes a rotary plate 2 that is slidably engaged with an operating shaft 1 in the axial direction, and a rotating plate 2 that is slidably engaged with an operating shaft 1 in the axial direction. A hammer 4 facing the rotation locus of the claw portion 3 at the tip of the hammer 4, and a piezoelectric element 5 in the front facing the hammer 4.
When the operating shaft 1 is driven, the claw portion 3 comes into contact with the front end surface 6 of the hammer 4, causing the hammer 4 to move backward against the spring 7, and then the claw portion 3 In one in which the hammer 4 is moved forward by the spring 7 when it is removed from the front end surface 6,
The hammer 4 is shaped like a cone with a circular cross-section or a polygonal pyramid with a polygonal cross-section with the front end side tapering, and has an arcuate surface or an inclined surface obliquely intersecting the plane containing the rotation locus. forming the hammer 4
A cutout surface 8 is formed on the circumferential surface of the operating shaft 1 side,
The side edge 6a of the notch surface 8 and the front end surface 6 is the claw portion 3.
It is arranged parallel to the tip edge 3a of the.

5 to 8 show an embodiment in which the hammer 4 has a conical shape, and the hammer 4 is slidably engaged with a long hole 10 formed in a substrate 9 in grooves 11, 11 on both sides thereof. Furthermore, cutout surfaces 8' similar to the cutout surfaces 8 formed on the circumferential surface on the operating shaft 1 side are formed on the upper and lower sides of the hammer 4 and on the circumferential surface on the opposite side to the operating shaft 1.

In the drawing, 12 indicates a pressing spring of the rotating plate 2.

Next, to explain its operation, when the operating shaft 1 is driven counterclockwise in the drawing from the state shown by the solid line in FIG. When the claw portion 3 moves back against the front end surface 6 at a predetermined retreat position, the spring 7
The hammer 4 moves forward with the urging force and strikes the piezoelectric element 5 in front.

In this case, since the side edge 6a of the front end surface 6 and the tip edge 3a of the claw part 3 are parallel to each other, the form of contact between the two 3 and 6 immediately before the claw part 3 comes off from the front end face 6 is clearly shown in FIG. As a result, the line contact is made at the tip edge 3a of the claw portion 3, and compared to the conventional point contact, the area of the contact portion is increased, the pressure acting on it is significantly reduced, and the durability of the contact portion is increased. Abrasion resistance is significantly improved. The hammer 4 is shaped like a cone or a polygonal pyramid with its front end tapered. In other words, after the claw 3 is removed from the front end surface, the opposing side surface recedes from the claw 3. The contact between the hammer 4 and the claw portion 3 can be broken as quickly as possible,
By continuing this contact, the moving speed of the hammer 4 decreases and the impact force of the hammer 4 decreases, which is not inconvenient. Next, when the operating shaft 1 is operated back clockwise in the drawing, the pawl 3 comes into contact with the circumferential side of the rear end of the hammer 4 which is in the forward position as shown in FIG. Since it is an arcuate surface that obliquely intersects the plane including the rotation locus, the claw portion 3 is given an upward escape by the arcuate surface, and thus the claw portion 3 can climb over the hammer 4 and return to its original position. will be reinstated.

In FIG. 9, the hammer 4 is shaped like a pyramid, and its operation is not particularly different from that of the above-mentioned conical hammer.

In addition, in the conventional type described above, for example, a cutting surface or a square head may be formed on the front end of the cylindrical hammer so that the side edge of the front end face and the tip edge of the claw part are parallel to each other. However, in either case, a step is created between the rear end and front end of the hammer, and when the hammer moves forward or the claw returns, the claw gets caught on the step, preventing smooth operation. I can't get it.

According to the present invention, however, the hammer 4 is shaped like a cone or a pyramid, and the cutout surface 8 is formed on the circumferential side of the hammer 4, so that no step is formed between the front end and the rear end of the hammer 4. Therefore, the claw portion 3 does not get caught on the circumferential side of the hammer 4.

As described above, according to the present invention, the hammer 4 has a conical shape with a circular cross section or a polygonal pyramid shape with a polygonal cross section with the front end side tapering, and the hammer 4 has a shape that is oblique to the plane containing the rotation locus. The hammer 4 is formed to have an arcuate surface or an inclined surface, and a cutout surface 8 is formed on the circumferential surface of the hammer 4 on the side of the operating shaft 1, and a side edge 6a between the cutout surface 8 and the front end surface 6 forms the claw. Since it is parallel to the tip edge 3a of the portion 3, the contact between the claw portion 3 and the front end surface 6 immediately before the claw portion 3 comes off the front end surface 6 extends over the entire width of the front edge 3a. This results in a line contact state, which significantly reduces the occurrence of deterioration due to kneading of point contact type contact parts, and the hammer is formed as described above, that is, the side surface of the hammer 4 facing the tip of the claw part 3. is retreated from the claw portion 3, the contact between the hammer 4 and the claw portion 3 is broken as quickly as possible, and the impact force of the hammer 4 is not reduced. Since the notch surface 8 is continuous with the circular arc surface or slope obliquely intersecting the surface, no step is formed between the notch surface 8 and the circumferential surface, and therefore the claw portion 3 engages with the step and the hammer 4 moves forward. This has the effect that the return of the claw portion 3 is not hindered, and smooth operation can be obtained.

[Brief explanation of the drawing]

Figure 1 is a plan view of a conventional device, Figures 2 and 3 are
The figures are a plan view and a cutaway side view illustrating the return operation of the pawl, FIG. 4 is an enlarged side view showing the state immediately before the pawl is removed from the hammer, and FIG. 5 is a plan view of an example of the device of the present invention. Figure 6 is a side view taken along the line - in Figure 5;
Fig. 7 is an enlarged side view showing the state immediately before the claw part is removed from the hammer, Fig. 8 is a perspective view of the main part illustrating the return operation of the claw part, and Fig. 9 is a perspective view of the main part of another embodiment. It is a diagram. 1... Operating shaft, 2... Rotating plate, 3... Claw portion, 3
a... Tip edge, 4... Hammer, 5... Piezoelectric element,
6...Front end surface, 6a...Side edge, 7...Spring, 8...
...Notch surface.

Claims (1)

[Scope of utility model registration request] A rotary plate 2 that is slidably engaged with the operating shaft 1 in the axial direction, a hammer 4 that faces the rotation locus of the claw portion 3 at the tip of the rotary plate 2, and a hammer 4 that faces the hammer 4. When the operation shaft 1 is driven, the claw portion 3 comes into contact with the front end surface 6 of the hammer 4, causing the hammer 4 to move backward against the spring 7, and then to move the hammer 4 backward against the spring 7. The claw portion 3 comes off from the front end surface 6 and the hammer 4
In the hammer 4, the hammer 4 has a conical shape or a polygonal pyramid shape with a thicker front end side, and is obliquely intersecting the plane containing the rotation locus. The operating shaft 1 of the hammer 4 is formed to have an arcuate surface or an inclined surface.
A cutout surface 8 is formed on the side circumferential surface, and the intersecting edge 6a of the cutout surface 8 and the front end surface 6 is the tip edge 3 of the claw portion 3.
a, and for the return movement of the rotary plate 2, the tip edge 3a is pressed against the conical or polygonal pyramidal slope by a hammer 4.
A piezoelectric device, characterized in that it moves in the axial direction of an operating shaft 1 offset from the center of a sliding shaft of a conical or polygonal pyramid.