JPS63276887A - Current-energized for spark plug in model engine - Google Patents

Abstract

PURPOSE:To simplify a job of assembly as well as to make the assembling state holdable so stably and strongly by setting a front end of a clip lever so as to cause a needle to come into contact with a plug's fixed terminal of itself at a time when it is bitten in a neck part of the spark plug. CONSTITUTION:Pickup operating pieces 31 and 31 of both clip levers 16 and 17 are held with finger tips, and upon the front end is opened wide, holding pieces 28 and 28 of the front and are covering on a large diametral hexagone nut part 14 of a spark plug P, and engaged pieces 29 and 29 are bitten in a small diametral neck part 15 of the plug P and engaged with it likewise. That is to say, with only these levers 16 and 17 are operated to be thrust in rectilinearly, a movable terminal 18 in an insulating holder 19 comes into contact with a fixed terminal 13 righteously of itself. In addition, since closing energizing force by compression coil springs 34 and 34 is given to the holding pieces 28 and 28 at the front end of these levers 16 and 17 and the engaged pieces 29 and 29, a stable engaged state to the plug P is strongly maintainable.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a device for energizing a spark plug in an engine installed in a model airplane, a helicopter, a boat, a racing car, or the like.

<Prior art> One of the applicants of the present invention developed a cap device for energizing the spark plug of a model engine of this kind in 1983-41.
No. 628 was proposed and its implementation achieved considerable results. However, as a result of continued intensive research, I learned that the following problems still need to be solved even with the above-mentioned known devices.

<Problems to be Solved by the Invention> That is, in the above-mentioned known device, due to its structure, firstly, by rotating the cap cylinder (13), the engaging portion (14) at the lower end of the cap cylinder (13) is connected to the spark plug (P). Hexagonal nut type stopper (8)
Because it is designed to be engaged with the cap tube (
In addition to the need to push the cap tube (13) into the cap (8), it is also necessary to rotate it further, and in relation to the specifications and form of the engine, the cap tube (13)
) is still complicated to install and use.

Second, the lower end l) joint (14) of the cap tube (13) must be specially manufactured and processed to have a size and opening shape that properly adapts to the plug body (8), otherwise the engine The startability of the engine deteriorates. Also, the cap tube (1
In 3), it is also necessary to screw the knob-shaped rotary operation part (19), which increases the overall cost of the cap structure.

Thirdly, even if the lower end engaging part (14) of the cap tube (13) and the stopper (8) are formed to fit correctly, their mutual engagement is rigid, and the engagement state is rigid. Since the spring pressure that strengthens and locks the plug is not fully heated, the engaging portion (14) may easily separate from the stopper (8) when subjected to external forces such as engine vibration or impact.

Fourth, the cap cylinder (13) as a whole, including its knob-shaped rotary operation part (19), has become significantly larger and heavier, and since it stands perpendicularly from the engine cylinder head (7), its plug body ( 8) It is very unstable when used and is prone to tilting and wobbling, so it may fall off accidentally.

Means to solve problems.

The present invention is intended to fundamentally solve these problems, and for this purpose, as a device for supplying electricity to a spark plug in a model engine, a pair of pivot pins facing each other in the middle of the longitudinal direction are used to open and close the spark plug. A pair of metal clip levers assembled to the clip lever, a pair of compression coil springs connected and hung between the levers facing each other in order to keep the front ends of both clip levers always closed, and the pivot pin mentioned above also doubles as it is. An insulating holder is held and fixed inseparably inside both levers, and a movable holder is fitted into the front end of a compression coil spring enclosed in the holder, and is always pressed in the direction of advancing from the holder. The terminal consists of a coil spring inside the holder, and one of the levers is connected to both poles of the plug cord. The first feature is that the movable terminal automatically comes into contact with the fixed terminal of the plug when it is bit into the neck, and also has a pair of pivot pins located midway in the longitudinal direction. one metal clip lever to which is fixed in advance, and the other metal clip assembled and engaged with the pivot pin so as to be bondable and mutually open and close around the pivot pin. In order to always close the lever and the front ends of both clip levers, a pair of compression coil springs are connected and suspended between the levers facing each other, and the pivot pin is used as it is, and a is inserted into the inside of both levers.
The holder consists of an insulating holder that is held and fixed to the holder, and a movable terminal that is fitted into the front end of a compression coil spring enclosed in the holder and is always pressed in the direction of advancing from the holder. When the two poles of the plug cord are connected to the inner coil spring and the one lever mentioned above, and the front ends of both levers are bitten into the small diameter neck of the spark plug protruding from the cylinder head, the above movable The second feature is that the terminal is set to automatically come into contact with the fixed terminal of the plug.

<Example> Hereinafter, the specific configuration of the present invention will be described in detail based on the illustrated example.
In Figure 3, (11) is the cylinder head of the model engine (E), which has many cooling fins (11).
2) is provided. (P) is an ignition plug fixedly integrated into the center of the top surface of the cylinder head (11) in an upright state, and its protruding tip is defined as a fixed terminal (13) for energization. (14) is a hexagonal nut part that extends from the midway point of the spark plug (P) with a large diameter, and the base end is a small diameter neck part (15) that is circular.
It is continued as

On the other hand, (16) and (17) are anchored by a pair of metal clip levers facing each other, and a movable terminal (18
) is assembled into an overall unit.

That is, first, the insulating holder (19) of the movable terminal (18) is made of heat-resistant cloth-filled Bakelite zelkova and is formed into a hollow cylindrical shape as in No. 4.5 IIO.

In (20), the continuous annular pin receiver provided in the middle part of the outer peripheral surface of the holder C19) is a recessed groove, but as a pair of pins corresponding to the pivot pins of the clip lever described later,
It is also possible to arrange them so that they face each other 180 degrees.

Similarly, (21) is a stepped spring holder formed on the inner peripheral surface of the holder (19), and (22) is a compression coil spring sealed and installed in the hollow interior of the holder (19), with the rear end being a spring. While the receiver is fixed to the step surface (21), a movable terminal (16) is electrically connected to the front end of the spring (22). The movable terminal (1
8) is made from yellow tF [in the form of a pin with a large-diameter head (23), and the fifth circumference B (25) provided on the outer peripheral surface of the small-diameter shaft (24) is As shown in the figure, the separated front end of the spring (22) is fitted.

Therefore, the movable terminal (18) is constantly subjected to a forward pushing force by the spring (22), and resists the pushing force as it sinks into the holder (19).
It is also possible to leave work at the rear. Needless to say, the anode side of the plug cord (26) is integrally connected to the spring (22) by soldering, welding, or the like.

Next, the pair of clip levers (16) and (17) are punched out by pressing a brass plate into the unfolded form as shown in Fig. 6.11, and then as shown in Figs. 7 to 10 and 12.
- They are curved in the shape of concave arcs facing each other as shown in Figure 15. (27) (27) is each lever (16)
A pair of left and right connecting ears (17) located in the middle of the first half in the longitudinal direction and bent relatively tall from both side edges of the levers (16) and (17). 27) (27) Comrades are confronted face to face.

(2B) (2B) is a pair of left and right holding pieces that are also continuously bent from both side edges at the front end position of the ear pieces (27) (27), and have an arc shape when viewed from the front. There is.

Moreover, by slightly bending the front edge at the front end position, the plug (P) has a small diameter neck (1
5) are set as locking pieces (29) and (29) that bite into and act on. As is clear from Figure 2.3, during its biting action, the holding piece (2B)
(2B) is also the large diameter hexagonal nut part of the plug (P) (
14).

Also, (30) (30) are each lever (16) (17)
A pair of left and right spring holders formed by bending both side edges from approximately the midpoint in the longitudinal direction of the spring holder are pieces;
The rear half of the spring receiver is set as the knob operation pieces (31) (31) for each lever (16) (17). (32) (32) is a connection hole for a plug cord that is opened in the middle of the operation piece (31) (31), and each lever (16) (17)
f) Longitudinal center & sl (Y - Y) to remote left tFJ
Or, it is arranged to be biased to the right side. The cathode side of the plug cord (26) is inserted into either of the reconnection holes (32) (32), and the two are connected and integrated by soldering, welding, or the like.

A pair of left and right pivot pins (33) are passed through between the connecting ear pieces (27) (27), and a pair of left and right pivot pins (33) are inserted between the connecting ear pieces (30) (30). By connecting and tensioning a pair of compression coil springs (34) (34), both levers (16) (17) are
As is clear from Figure 3, its pivot pin (33) (33
) is the center of oscillation, and the front end opens and closes at 70 degrees.

In that case, the pivot pin (33) (33) is connected to the lever (16).
) (17) rather than one long line that completely penetrates and traverses it.
As a pair of short and separated left and right pieces, each has a slight dimension (W) extending inward from the connecting ear piece (27) (27)
) (W), and the pin receiver of the insulating holder (19) is inserted into the groove (
20). In other words, the pivot pin (33) (
33) simultaneously connects both levers (16) (17) and simultaneously shifts the position of the insulating holder (19) held in the hollow interior of both levers <16) (17) along its longitudinal direction. It is also configured to function as a stopper to prevent the formation of layers.

In this regard, in the illustrated example, in order to particularly facilitate the assembly work, a left and right pair of pivot pins (33) (33) made of rivets are attached to the center of the connecting lug (27) of one lever (16). Install the penetrating pin (33) in the fixed state by caulking it in advance, and then attach the other lever (1) to the pivot pin (33) (33).
7), and the pivot pin (33) (33)
It is assembled so that the opening and closing movements described above can be performed with ease.

(S) has the other lever (1) as a necessary configuration for that purpose.
The pin receiver formed to correspond to the connecting ear piece (27) in 7) is a receiving notch, and its punched opening form is the same as No. 11ff.
As can be seen from the figure 1, it is almost L-shaped when viewed from the side. From the entrance/exit part (35) to the central part (36) of the notch (S)
) until the pivot pin (33) (33) can be inserted. Moreover, the bending boundary position between the entrance/exit part (35) and the inner part (36) is made slightly narrower than the opening diameter CD of the inner part (36) as a retaining shoulder 9B (37). The pivot pin (3) is forced to pass through the retaining shoulder (37), so to speak.
3) The receiver (33) is inserted into the notch (S) and is locked.

The above plug cord (26) (75 connection hole (32)
(32) can be moved to either lever (16) (1
7), it is preferable to first punch out an opening into one lever (16) on which the pivot pin (33) (33) is fixedly installed.
7) without the plug cord (26) attached.
This is because assembly work can be done easily.

(38) (3B) is a grip cover made of soft synthetic resin that is integrally attached to the knob operation pieces (31) (31) of both levers (16) (17), and one of the grip covers is a plug cord ( It also has the focusing ability of 88N (26). still,
As long as the pivot pins (33) (33) do not cross the levers (16, 17) in a skewered and penetrating state as a pair of left and right, the pin receiver will not fit into the other lever (17) equipped with the insertion notch (S). The pivot pin (16) can also be made in exactly the same form as the other lever (16) that does not have the notch (S) and assembled symmetrically with each other.
33) It is sufficient if the insulating holder (19) of the movable terminal (18) can also be held in a stable fixed state inside both levers (16) and (17) by (33).

Function> When using the present invention with the above configuration, the knob operating pieces (31) (3) of both clip levers (16) (17)
1) with the fingertips of one hand as shown in Figures 16.19 to 1, the front end is forcibly expanded, and the holding piece (28) at the front end is held open. 28) onto the large-diameter hexagonal nut (14) of the spark plug (P), and attach the same locking piece (29) to the plug (29).
It bites and locks into the small diameter neck (15) of P). That is, while expanding both levers (16) and (17) from their front ends, the spark plug (P) In order to lock it in the crowned state, it is sufficient to simply push it in a straight line.

Then, as is clear from Figure 2.3, the movable terminal (18) held in the insulating holder (19) will automatically correctly connect to the fixed terminal (13) of the spark plug (P). Since the movable terminal (18) is also applied with back pressure by the spring (22), it is possible to provide a reliable energizing action to the spark plug (P) via the plug cord (26). It turns white. The clip levers (16) (17)
Its own locking pieces (29) (29) come into contact with the neck (15) of the spark plug (P), resulting in so-called body grounding.

Moreover, the holding piece (2B) (28) and the locking piece (29) (2
9) is also given a closing biasing force by the compression coil springs (34) (34), so the spark plug (P
), and even if it encounters vibrations and shocks from the engine (E), it can effectively absorb them and prevent wobbling, tilting, ups and downs, etc. There is no risk of this occurring.

<Effects of the Invention> In summary, in the present invention, the pair of pivot pins (33) (33) facing each other at the midway point in the longitudinal direction,
A pair of gold MM clip levers (16) (17) assembled to open and close, and both clip levers (1
6) A pair of compression coil springs (34) (34) connected and hung between the levers (16) and (17) facing each other in order to always close the front end of the lever (17), and the pivot pin (33). ) (33) can be used as is,
An insulating holder (19) is held and fixed in an undetachable manner inside both levers (16) and (17), and a compression coil spring (2) is enclosed within the holder (19).
2) and is always attached to the front end of the holder (19).
It consists of a movable terminal (18) that is pressed in the direction of advancing from the holder (19), and a coil spring (22) in the holder (19), and a plug cord (
26), and at the same time, bite the front ends of both clip levers (16) and (17) into the small diameter neck (15) of the spark plug (P) protruding from the cylinder head (11). When the above movable terminal
- (18) is set so that it automatically contacts the fixed terminal (13) of the plug (P), so the problems of the prior art mentioned at the beginning can be completely solved, and the manufacturing and Machining and assembly can be performed easily, and effects that can be used for various engines can be achieved.

In particular, as embodied in the illustrated embodiment, a pair of pivot pins (33) are provided in advance to one clip lever (16).
(33) is held fixed, and the remaining clip lever (17) is attached to its pivot pin (33) (33).
Both levers (113) (17) can be freely engaged and disengaged later.
If they are assembled and engaged so that they can open and close with each other, the above-mentioned assembly work can be performed more easily and efficiently, and mass productivity can be significantly improved.

In other words, the movable terminal (18) insulating holder (
After fitting and fixing the holder (19)
The other lever (17) can be correctly and smoothly assembled and engaged with the pivot pins (33) (33) of one lever (16) so as to cover the two levers (17).

In that case, the receiver for the pivot pin (33) (33) for assembling and engaging the other lever (17) is inserted into the notch (
S), from the entrance/exit part (35) and the inner part (36) of the pin (33) (33) and the retaining shoulder part (37) with a slightly narrow opening width that continues at the boundary position.
If the opening is formed into an overall L-shape when viewed from the side, the assembly workability described above will be excellent, and the assembly state will never be changed! This can be said to be even more beneficial since it can be kept stable and robust without falling off.

[Brief explanation of the drawing]

Fig. 1 is an overall schematic sectional view showing the process of using the present invention;
The diagrams are the same (cross-sectional view of the used state, Figure 3 is 3-3 in Figure 2)
Fig. 4 is a side view showing an extracted insulating holder of the movable terminal, Fig. 5 is an enlarged sectional view taken along line 5-5 in Fig. 4, and Fig. 6 is one of the clips. FIG. 7.8 is a side view and front view of the clip lever in a bent and raised three-dimensional state; FIG. 9 is a sectional view taken along line 9-9 of FIG. 8; FIG. 10-10m sectional view in Figure 7, Figure 11 is a plan view showing the other clip lever unfolded, Figures 12 and 13 are side and front views of the three-dimensional state in which the clip lever is bent up, Figure 14 The figure is a sectional view taken along line 14-14 in Fig. 13, and Fig. 15 is a sectional view taken along line 15-15 in Fig. 12.
Figures 16 and 17 are side and rear views showing the overall assembled state, Figure 18 is a sectional view taken along line 18-18 in Figure 16, and Figures 19 to 21 are the same (both clip levers are Overall side view, plan view, and front view in the expanded operating state, No. 22
The figure is a sectional view taken along line 22-22 in FIG. 19, and FIG. 23 is an enlarged sectional view taken along line 23-231it in FIG. 19. (E) ...Model engine (P) ...Spark plug (S) ...Put the pivot pin receiver into the notch (11).
...Cylinder head (13) ...Fixed terminal (14) ...Hex nut (15) ...Neck (16) (17) ...Clip lever (18) )
...Movable terminal (19) ...Door color edge holder (20) ...Pin holder is inserted into groove (22) (34) (34) - Compression coil spring (
27) (27) ...Connecting ear piece (2B) (28
)...Holding piece (29) (29)...Locking piece (30) (30)...Spring holder piece (31) (
31) ...Knob operation piece (33) (33)
... Pivot pin (35) ... Doorway (3G) ... Back part (37) ... Stopping shoulder (3B) (38) ... Grip cover patent Applicant: Tetra Co., Ltd. Figure 3 Figure 8 = ≠ Figure 9 Figure io

Claims (1)

[Scope of Claims] 1. A pair of metal clip levers (16) (17) assembled to open and close by a pair of pivot pins (33) (33) facing each other at a midway point in the longitudinal direction.
and a pair of compression coil springs (34) connected and suspended between the opposing levers (16, 17) in order to keep the front ends of both the clip levers (16, 17) closed at all times.
(34), an insulating holder (19) that is irremovably held and fixed inside both levers (16) and (17) by using the pivot pins (33) and (33) as they are, and the holder ( 19) A compression coil spring (2
2) and is always attached to the front end of the holder (19).
It consists of a movable terminal (18) that is pressed in the direction of advancing from the holder (19), a coil spring (22) in the holder (19), and a plug cord (2) attached to one of the levers (16, 17).
6), and at the same time, bite the front ends of both clip levers (16) and (17) into the small diameter neck (15) of the spark plug (P) protruding from the cylinder head (11). When the above movable terminal (1
8) A device for energizing a spark plug in a model engine, characterized in that the spark plug (8) is set to automatically contact the fixed terminal (13) of the plug (P). 2. A pair of pivot pins (33) (33
) is fixed in advance on one metal clip lever (1
6), and the other metal which is assembled and engaged with the pivot pins (33) (33) so as to be freely engageable and detachable, and to mutually open and close along the pivot pins (33) (33). A pair of compression coil springs (34, )
(34), an insulating holder (19) that is irremovably held and fixed inside both levers (16) and (17) by using the pivot pins (33) and (33) as they are, and the holder ( 19) A compression coil spring (2
2) and is always attached to the front end of the holder (19).
It consists of a movable terminal (18) that is pressed in the direction of advancing from the terminal, and both poles of the plug cord (26) are connected to the coil spring (22) in the holder (19) and one of the levers (16). When the front ends of both levers (16, 17) are fitted into the small diameter neck (15) of the spark plug (P) protruding from the cylinder head (11), the movable terminal ( 18) A device for energizing a spark plug in a model engine, characterized in that the spark plug (18) is set to automatically contact a fixed terminal (13) of the plug (P). 3. The front ends of both clip levers (16, 17) are held at the large hexagonal angle of the spark plug (P) by a pair of opposing holding pieces (28, 28) bent up from both side edges of the clip levers (16, 17). A locking piece that has an overall annular shape in front view that can hold the nut part (14), and also bites into the small diameter neck part (15) of the spark plug (P) from the front edge of the front end part. (29) A device for supplying electricity to a spark plug in a model engine according to claim 2, characterized in that (29) is also bent. 4. To the pivot pin (33) fixed to one clip lever (26) (33), the other clip lever (17)
A pin receiving notch (S) for removably assembling and engaging the pivot pin (33) is provided at the entrance/exit part (35) and the inner part (36) of the pivot pin (33), as well as a slightly narrow continuation at the boundary position thereof. From the retaining shoulder (37), the overall length is approximately L when viewed from the side.
Claims characterized in that the opening is formed in a letter shape.
2. A device for supplying electricity to a spark plug in a model engine according to item 2.