JP3010847U - Booster for energizing spark plug in model engine - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a booster for energizing a spark plug that does not generate power loss or harmful noise and that allows convenient energization work. [Structure] A head case 25 and a head cap 32 are screwed to the upper end of a cylindrical booster body 16 having a movable terminal 54 capable of contacting with a fixed terminal 13 of a spark plug P standing from a cylinder head 11 of a model engine E. By fastening them, the substrate storage chamber S is divided, and the substrate 35 on which the pulse control circuit is printed and printed is stored therein, and the printed wiring substrate 35 and the movable terminal 54 are connected to the booster cord on the anode side. While connecting and wiring by 57, the booster cords 58, 59 on the anode side and the cathode side which are also led out from the printed wiring board 35
Clips 60 and 61 were attached to the tip ends of the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a booster for energizing a spark plug in an engine mounted on a model airplane, a helicopter, a boat, a racing car, etc. which is operated by a so-called radio controlled radio.

[0002]

[Prior art]

 The specified voltage of the spark plug in this type of model engine is generally 1.5 V. Above this, the spark plug overheats, but below this, it cannot ignite.

Further, because of the low voltage as described above, resistance loss is likely to occur in the connection wiring with the 1.5V dry battery, and a high current of about 3A is required as compared with the low voltage. The result is exhaustion at an early stage, which is also extremely uneconomical.

Therefore, recently, a booster (b) of a type that uses a 12V lead battery (battery) and controls electric power by a pulse controller having a pulse control circuit built therein has become widespread.

That is, the pulse controller (c) in the form of an instrument as shown in FIG. 13 is installed in the middle of the booster cord (2) extending from the booster body (1) and the booster cord (2) A pair of clips (3) attached to the extension tip are used for connection with the battery.

[0006]

[Problems to be solved by the device]

 However, in such a conventional booster (b), since the pulse controller (c) is connected to the booster cord (2) in the middle of the booster cord (2) as an instrument form independent of the booster body (1), the spark plug (c) is connected. Depending on the weight of the pulse controller (c), the booster body (1) may fall off from the spark plug or the clip (3) may fall off from the battery during use of the booster cord. It is necessary to wire (2) long.

Then, in addition to a large power loss, harmful noise is generated, which has a problem of adversely affecting the radio-controlled radio device. Further, since the booster body (1) is provided with a string for the pulse controller (c), it is not possible for one person to conveniently carry out the energization work to the spark plug.

Further, the pulse controller (c) is also provided with a disconnection check clamp (4) for energization, but since the pulse controller (c) itself is far away from the booster body (1), the spark plug It is difficult to instantly check the disconnection status of, and it must be said that it is inconvenient.

[0009]

[Means for Solving the Problems]

 The present invention intends to improve such a problem, and the upper end portion of the cylindrical booster body having a movable terminal capable of contacting with a fixed terminal of a spark plug which is erected from a cylinder head of a model engine is configured for that purpose. Then, the head case and the head cap to be capped on the head case are screwed and fastened in a communicating state to form a board storage chamber, and the board with the pulse control circuit printed wiring is stored in the board storage chamber. While connecting and connecting the printed wiring board and the movable terminal with a booster cord on the anode side, connect the battery to the tip of the booster cord on the anode side and cathode side led out from the printed wiring board to the outside of the head case. The feature is that each clip to be used is attached.

[0010]

[Action]

 According to the above-mentioned configuration of the present invention, the board storage chamber is defined at the upper end of the cylindrical booster body, and the printed wiring board of the pulse control circuit is housed inside the chamber, so that it is separate from the conventional booster body. Unlike other instrument-type pulse controllers with strings, it is extremely easy and convenient to conduct electricity.

Further, since the printed wiring board and the movable terminal can be connected and wired by the anode side booster cord in a short linear state that conducts inside the booster body, power loss and harmful noise are not generated. Since it can be suppressed as much as possible, there is no risk of adversely affecting radio-controlled radio equipment.

[0012]

【Example】

 The specific configuration of the present invention will be described in detail below with reference to the drawings. In FIGS. 1 to 5 showing the usage state of the present invention, (11) is an engine mounted on a model airplane, helicopter, racing car, etc. The (E) cylinder head is provided with a large number of cooling fins (12). In this respect, the example of the figure shows a vertical engine (E) installed and used in a vertical posture, but it is needless to say that it is not limited to the vertical engine.

(P) is an ignition plug fixedly integrated with the center portion of the upper surface of the cylinder head (11) in a standing state with a certain height, and its upper end portion is a fixed terminal (13) for energization. Make up. Similarly, (14) is a large-diameter hexagonal nut portion that integrally extends from the mid-height position of the spark plug (P), and is provided with a circular small-diameter neck portion (15) continuous at the lower end position. There is.

(B) is a generic term for a booster for energizing the spark plug (P) in order to start the engine (E), which is assembled into a unit from a large number of the following parts. ing.

That is, in FIGS. 6 to 11 showing the disassembled state and the assembled state of the energizing booster (B), (16) is a cylindrical booster body, and a core tube (17) of a certain length and its It is composed of a spring retainer (18) and a collet chuck (19) which are connected to the upper and lower ends thereof.

Although the core tube (17) is a brass tube sliced into rings, the spring retainer (18) is a hollow product having a larger outer diameter than the core tube (17). It has been cut, and its thin insertion leg (20) is inserted from above into the hollow inside of the core tube (17) and is integrally caulked.

Reference numeral (21) is a core tube receiving step formed on the outer peripheral surface of the spring retainer (18) by thinning the insertion leg (20), and (22) is the outer peripheral surface of the spring retainer (18). A spring receiving groove provided in the middle of the surface, and the space between the spring receiving groove (22) and the core tube receiving step (21) is set as a spring guide inclined surface (23). ing.

Further, (24) is a male screw engraved on the upper end portion of the outer peripheral surface of the spring retainer (18), to which a female screw (26) of the head case (25) is screwed from above. It has been concluded. (27) is a spring receiving plate sandwiched between the lower surface of the head case (25) and the upper surface of the spring retainer (18), and (28) is a cord which is opened in the center of the lower surface of the head case (25). The conduction hole is shown.

The head case (25) is formed by cutting an aluminum rod into a U-shaped cross section, and the circumferential body surface of the head case (25) has an insertion hole (29) for a current adjusting operation tool and a cord guide notch (30). ) Is formed with an opening. In that case, the cord lead-out notch (30) is U-shaped in a front view, and a booster cord, which will be described later, can be pulled out from above.

(31) is a male screw engraved on the upper end of the opening of the head case (25), and (32) is a head cap machined from an aluminum rod into an inverted U-shaped cross section. The female screw (33) formed corresponding to the lower end is screwed and fastened to the male screw (31) of the head case (25) in a crowned state from above. In the fastened state, the head case (25) and the head cap (32) have a cylindrical shape with the same straight diameter, and the inside thereof is partitioned as a substrate storage chamber (S). The head cap (32) can be removed from the head case (25).

Reference numeral (34) is a lamp see-through hole formed in the central portion of the upper surface of the head cap (32), and (35) is a printed wiring board of a pulse control circuit inserted into the board storage chamber (S). As the pulse control circuit extracts in Fig. 12, the control signal generator (pulse generator) (36), current controller (FET) (37), current adjusting volume (38), disconnection check clamp ( LED) (39), etc.

The current adjustment volume (38) is located at a position corresponding to the insertion hole (29) of the current adjustment operation tool opened in the head case (25), and the minus hole inserted through the insertion hole (29). By locking the current adjusting operation tool (T) such as a driver with the locking notch (40) of the current adjusting volume (38) and rotating the current adjusting operation tool (T), the current level can be adjusted. ing. A colored mark serving as a mark of the adjustment position is also provided on the surface of the current adjustment volume (38), but this is not shown.

Further, the disconnection check clamp (39) is erected in the lamp see-through hole (34) opening in the head cap (32), and the spark plug (39) is visually observed from the outside. It is possible to know the energization state to P), and when it does not emit light, it is necessary to investigate the disconnection, defective battery, reverse polarity connection, and other causes.

Reference numeral (41) is a ground plate such as a copper plate which is integrally projected from the printed wiring board (35), and is conductively connected to the head case (25) and the head cap (32) in an elastic state. Reference numeral (42) is an electric insulating cover of the printed wiring board (35) which is also inserted into the board storage chamber (S).

Like the spring retainer (18), the above-mentioned collet chuck (19) is also machined from a brass rod, but its outer diameter is almost equal to that of the core cylinder (17), and its thin wall An insert leg (43) is inserted into the hollow portion of the core tube (17) from below and is integrally caulked.

Reference numeral (44) is a core tube receiving step surface formed on the outer peripheral surface of the collect chuck (19) by thinning the insertion leg (43), and (45) is a circumferential cylinder of the collect chuck (19). There are a plurality of keyhole-shaped split grooves that are engraved at a certain depth from the lower end, with the entire surface being radially symmetrically arranged, and the same number of locking claws (46) are diverged between adjacent grooves. Has been done.

Therefore, each locking claw (46) can be elastically expanded and deformed from the toe (47) at the lower end thereof, and the hexagon nut part (14) of the spark plug (P) as a whole can be deformed. The nut portion (14) can be fitted so as to surround it. Moreover, the toes (47) of the locking claws (46) are slightly bulged inward, and they bite into the small-diameter lower end neck (15) of the hexagonal nuts (14) and the nuts It is designed so that it does not come out upward from (14).

As described above, since the booster body (16) is assembled into a cylindrical shape from the three parts of the core cylinder (17), the spring retainer (18) and the collet chuck (19), the overall length is different. When manufacturing several kinds of energization boosters (B), it is possible to deal with them by simply changing the length of the core tube (17) made of a simple brass tube. 18) and the collet chuck (19) can be commonly used as general-purpose parts, which is extremely effective for cost reduction in multi-product production.

Further, (48) is a sheath cylinder slidably fitted into the booster body (16), and is composed of a brass tube of a constant length, and a spring is provided at the upper end of the circumferential barrel surface. The handle ring (49), which also functions as a retainer, is fitted and then integrally caulked.

That is, since the handle ring (49) is machined from a brass rod in the form of an overhanging flange having a diameter larger than that of the sheath tube (48), the fingertip of the operating hand can be stably hung on it. Further, a spring receiving groove (50) is provided at the upper end of the outer peripheral surface of the handle ring (49), and the spring guiding slope is provided between the upper end and the spring receiving groove (50). It is also formed as a face (51).

Since a separate handle ring (49) is attached to the sheath tube (48), when producing several kinds of boosters (B), the sheath tube is corresponding to the core tube (17). It is sufficient to change the length of the cylinder (48), which is also excellent in cost reduction for multi-product production.

Reference numeral (52) denotes an exterior state of the booster body (16), which is the upper and lower sides of the spring receiving groove (22) of the spring retainer (18) and the spring receiving groove (50) of the handle ring (49). It is a compression coil spring which is stretched and connected to each other, and by which the sheath cylinder (48) is pressed and urged downward, and the booster main body (16) is always enclosed so that its locking claw (46) is not exposed downward. Keep it at.

In that case, the upper and lower ends of the coil spring (52) are simply and simply locked in the spring receiving groove (22) of the spring retainer (18) and the spring receiving groove (50) of the handle ring (49). In addition, since the spring retainer (18) and the handle ring (49) are provided with the spring guiding inclined surfaces (23) and (51) facing each other on both outer peripheral surfaces thereof, the booster body described above is not provided. It is possible to assemble and disassemble the sheath cylinder (48) with respect to the core cylinder (17) of (16) without the need for tools and easily pulling it out even with a hand.

Further, at that time, since the coil spring (52) has a spiral directional property, the spring retainer (18) of the booster body (16) and the handle ring (49) of the sheath tube (48) are relatively positioned relative to this. When the coil spring (52) is wound around, the coil spring (52) is surely and stably locked as if slipping into the spring receiving groove (22) (50) along the guide inclined surface (23) (51).

Reference numeral (53) is a terminal insulating holder slidably fitted into the inside of the collet chuck (19) of the booster body (16), which is formed from cloth-baked bakelite into a cylindrical shape. A movable terminal (54) corresponding to the fixed terminal (13) of the ignition plug (P) is integrally press-fitted in the center of the lower end thereof so as not to fall off. The movable terminal (54) is also machined from a brass rod into a chip shape.

Reference numeral (55) is a spring receiving notch provided at the upper end of the outer peripheral surface of the terminal insulating holder (53), and another compression member is provided between the spring receiving notch and the spring receiving plate (27). A coil spring (56) is connected and stretched so that the terminal insulating holder (53) is constantly urged downward. However, the movable terminal (54) is kept in a retracted state in which it is inevitably immersed in the inside than the toe (47) of the above-mentioned collet chuck (19).

Further, (57) is a booster cord of an example of an anode for electrically connecting the printed wiring board (35) and the movable terminal (54), needless to say, since it is built in the booster body (16). , Its short length is enough to prevent power loss and harmful noise.

Reference numerals (58) and (59) are a pair of anode-side and cathode-side booster cords led out to the outside from the printed wiring board (35) through the cord lead-out notch (30) of the head case (25). Although it may be possible to linearize the midway portion into a parallel focused state, it is preferable to wind it into a coil shape as a so-called curl cord.

Reference numerals (60) and (61) are a pair of clips attached to the leading ends of the booster cords (58) and (59), and as suggested by FIG. 12, a battery (62) for starting the engine. Needless to say is used to connect to). As the battery (62), a voltage of 7.2V to 12V is prepared.

Reference numeral (63) is a fuse which is inserted and connected in the vicinity of the tip end portion of the cathode side booster cord (59), and ensures safety against a short shot and the like. Reference numeral (64) is a bending protection cover that covers the lead-out base end portions of both booster cords (58) and (59), and is fitted into the lead-out notch (30) of the head case (25) as a tightly wound form of a coil spring. ing. When the fuse (63) runs out, the fuse tube in the fuse case can be replaced.

When the model engine (E) is started using the booster (B) of the present invention, a booster cord (58) (59) derived from the head case (25) of the booster body (16). While connecting the clips (60) (61) attached to the battery to the anode side and the cathode side of the battery (62), place one thumb on the head cap (32) of the booster body (16) from above, The remaining index finger and middle finger are applied to the handle ring (49) of the sheath tube (48) from below, and the sheath tube (48) is pulled up as shown by the arrow (U) in FIG.

By doing so, the locking claw (46) of the collect chuck (19) in the booster body (16) is exposed and is kept in a state where it can be expanded and deformed from the tip of the toe (47). 19) is inserted into the spark plug (P) of the engine (E) from above, as indicated by the arrow (D) in the figure, so as to be crowned.

In the process, since the toe (47) of the locking claw (46) is projected inward, this is once drawn along the hexagon nut part (14) of the spark plug (P). As shown in FIG. 2, it expands and deforms, and as it passes through the nut portion (14), it contracts and restores itself, and bites and locks on the neck portion (15) having a small diameter.

On the other hand, the movable terminal (54) inside the booster body (16) following the insertion operation also receives the back pressure of the compression coil spring (56) thereof, and the fixed terminal () of the ignition plug (P 1). It is kept in close contact with 13) and gives a stable and reliable energizing action to the spark plug (P). Then, this can be instantly confirmed from above the head cap (32) by the light emission of the wire breakage clamp (39). If the light emission does not occur, the battery (62) is defective, the polarity is reversed, the wire is disconnected, etc. This is extremely convenient because the cause of can be known.

Further, depending on the voltage of the battery (62) and the type of the spark plug (P), the current flowing state changes, but the head case (25) of the booster body (16) has a current adjusting volume (38). Since it is also installed, it can be properly adjusted by externally rotating the current adjusting operation tool (T).

Further, when the toe (47) of the locking claw (46) is locked to the small diameter neck (15) of the hexagon nut (14) at the final stage, if the pulling up hand is released, The outer peripheral surface of the locking claw (46) is constrained in a completely enclosed state as shown in FIGS. 3 to 5 by the sheath tube (48) returning downward, and the sheath coil (48) also has a compression coil. As a result of the back pressure of the lub spring (52), the provisional engine (E) is installed not only in the vertical position but also in a tilted position at a certain angle, but sudden vibration or shock may occur in the engine (E). However, there is no risk that the above-mentioned bite locking force will decrease, rattling will occur, or even fall off.

In any case, the printed wiring board (35) of the pulse control circuit is built in the board storage chamber (S) of the booster body (16) and movable with the printed wiring board (35). The booster cord (57) on the anode side that connects to the terminal (54) can also be used in a short straight wiring state, so power loss and harmful noise can be suppressed as much as possible, and it can be conveniently handled and used. Of.

[0048]

[Effect of device]

 As described above, the energizing booster of the present invention has the movable terminal (54) which can contact the fixed terminal (13) of the spark plug (P) which is installed from the cylinder head (11) of the model engine (E). The head case (25) and the head cap (32) capped on the head case (25) are screwed into the upper end of the cylindrical booster body (16) so as to communicate with each other, thereby forming a substrate storage chamber (S). A board (35) on which a pulse control circuit is printed is stored in the board storage chamber (S), and the printed wiring board (35) and the movable terminal (54) are connected to the booster cord (on the anode side). 57) while connecting and wiring by means of 57) to the tips of the anode side and cathode side booster cords (58) (59) led out from the printed wiring board (35) to the outside of the head case (25), Since that is Tsuteri (62) and the connection used to clip (60) (61) are respectively mounted, there is an effect that can be fully improved prior art problems was Setsuji based on FIG.

That is, according to the above configuration of the present invention, the substrate housing chamber (S) is defined at the upper end of the cylindrical booster body (16), and the printed wiring board (35) of the pulse control circuit is formed therein. ) Is stored, unlike the conventional instrument type pulse controller (c) which is separate from the booster main body (1) and has a cord, it is possible to carry out energization work very easily and conveniently.

Further, the printed wiring board (35) and the movable terminal (54) can be connected and wired by a short straight linear anode side booster cord (57) which conducts inside the booster body (16). As a result, power loss and the generation of harmful noise can be suppressed as much as possible, and there is no risk of adversely affecting radio-controlled radio equipment.

In particular, if the structure of claim 2 is adopted, from the insertion hole (29) opening in the head case (25) of the booster main body (16), the current adjusting operation tool (T) such as a flat-blade screwdriver. Is inserted, whereby the current adjusting volume (38) is rotatably operated, and there is an effect that the current level can be adjusted depending on the voltage of the battery (62) and the type of the ignition plug (P).

Further, if the structure of claim 3 is adopted, through the lamp see-through hole (34) of the head cap (32) attached to the booster body (16) itself, the disconnection check lamp (39) emits light, It has an effect that the energized state can be confirmed at a glance, and that disconnection, reverse connection of polarity, defective battery (62), etc. can be instantly known.

Further, if the configuration of claim 4 is adopted, there is an effect that the safety can be secured by the fuse (63) in the event of a short-circuit or the like.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a booster of the present invention in an operating state in which a sheath cylinder is pulled up.

FIG. 2 is a cross-sectional view showing an expanding deformation action of a locking pawl in the booster.

FIG. 3 is a sectional view showing a state in which the locking claws bite and lock the ignition plug of the engine.

4 is an enlarged cross-sectional view taken along line 4-4 of FIG.

5 is an enlarged sectional view taken along line 5-5 of FIG.

FIG. 6 is a side view of the entire appearance of the booster.

FIG. 7 is an exploded view of the booster.

8 is an enlarged sectional view taken along line 8-8 of FIG.

FIG. 9 is a cross-sectional view showing the booster body and the sheath tube after assembly after they are separated from each other.

FIG. 10 is an overall assembly view of the booster.

11 is an enlarged cross-sectional view taken along line 11-11 of FIG.

FIG. 12 is an explanatory diagram showing a pulse control circuit.

FIG. 13 is an external view showing a conventional booster.

[Explanation of symbols]

 (11) -Cylinder head (12) -Fixed terminal (14) -Hexagonal nut part (15) -Neck part (16) -Booster body (17) -Core cylinder (18) -Spring retainer (19) -Collet chuck (25) ) ・ Head case (29) ・ Insert hole for current adjustment operation tool (32) ・ Head cap (34) ・ Lamp see-through hole (35) ・ Printed wiring board (38) ・ Current adjustment volume (39) ・ Disconnection wire clamp (57)・ Booster code (58) ・ Booster code (59) ・ Booster code (60) ・ Clip (61) ・ Clip (63) ・ Hyuse (B) ・ Booster (E) ・ Engine (P) ・ Spark plug (S) ・Substrate storage room (T), current adjustment operation tool

Claims (4)

[Scope of utility model registration request] 1. A fixed terminal (1) of a spark plug (P) which is planted from a cylinder head (11) of a model engine (E).
3) to the upper end of the cylindrical booster body (16) having a movable terminal (54) that can contact the head case (2).
5) and the head cap (32) to be crowned thereto are screwed and fastened to each other in a communicating state to define the substrate storage chamber (S), and the pulse control circuit is provided with the printed wiring in the substrate storage chamber (S). The printed wiring board (35) is housed and the printed wiring board (35) and the movable terminal (54) are connected and wired by the booster cord (57) on the anode side, while the printed wiring board (35) is connected to the head case. (2
5) to the tips of the anode-side and cathode-side booster cords (58) (59) led out to the outside, the battery (6
2. A booster for energizing a spark plug in a model engine, characterized in that clips (60) (61) used for connection with 2) are attached respectively. 2. A current adjusting volume (38) forming a pulse control circuit can be rotated by a current adjusting operating tool (T) inserted and locked through an insertion hole (29) opening in a head case (25). The booster for energizing a spark plug in a model engine according to claim 1, characterized in that. 3. The disconnection check clamp (39) forming the pulse control circuit is defined to be visible through a lamp see-through hole (34) opening in the upper surface of the head cap (32). A booster for energizing the spark plug in a model engine. 4. A model engine ignition according to claim 1, wherein a fuse (63) is inserted and connected in the vicinity of the tip of the cathode side booster cord (59) led out from the printed wiring board (35). Booster for energizing the plug.