JPH0231575Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is a mechanism for preventing engaging members from jumping up in a recoil starter, which has a simple structure and can strongly prevent engaging members such as gears from jumping up. Regarding.

(Prior Art) As a method for starting an engine using a recoil starter, there is a method in which a gear provided in the recoil starter is rotated, and this gear is meshed with a gear on the engine side to start the engine. Among these, the gear of the recoil starter is generally spline-fitted to a helical spline shaft that rotates together with the reel, so that it moves toward the gear on the engine side during a starting operation, and returns to its original position after the engine has started. It is composed of

In this case, when the gear returns to its original position,
There is a problem in that the gear contacts the top of the reel with force and bounces, which then moves to the gear side on the engine side and comes into contact with it, causing damage and noise, so it is necessary to prevent this so-called gear jumping. has arisen.

For this reason, various proposals have been made in the past for the above purpose. For example, Utsukai Showa 59-159783
In the publication, an L-shaped notch step is formed on the circumferential surface of a bowl-shaped cover attached to the tip of a rope pulley support shaft, and the end of a clip-shaped braking member attached to a gear is engaged with this notch step. Such a mechanism is disclosed, and in Japanese Utility Model Application Publication No. 60-134871, a cut-out stopper is formed in the tongue of a retainer attached to the tip of the support shaft, and a friction stopper attached to the gear is formed in the stopper. A mechanism is disclosed for engaging the ends of a spring.

(Problem that the invention aims to solve) However, these conventional mechanisms are limited in their applicability to recoil starters equipped with gears. Because this method uses an engagement method, the friction spring can come off the gear or shift from the specified mounting position due to inertia when the gear stops moving, and foreign matter or dust that has entered the starter can be prevented from moving by the friction spring. There was a concern that the intended action would deteriorate or become impossible due to interference with the spring attachment part. In addition, since the friction spring has a complicated shape, it is difficult to process it, resulting in an increase in the number of parts and an increase in cost.

The present invention solves these conventional problems and can be applied to recoil starters with a structure that does not have a gear.Moreover, the notch formed in the braking member can be directly engaged with a gear, etc., without using the above-mentioned friction spring. A method for preventing an engaging member from jumping up in a recoil starter, which works reliably and strongly to prevent the engaging member from jumping up by engaging with the mating member, and has a simple structure that makes it easy to manufacture. The purpose is to provide a mechanism.

(Means for solving the problem) Therefore, the mechanism for preventing the engagement member from jumping up in the recoil starter of the present invention includes a braking member disposed on the center shaft that rotatably supports the reel, and the braking member The recoil starter is provided with an engaging member having a notch formed on a side surface and moving toward an engaged member on the engine side during a starting operation to engage with the member and enable the engine to be started, guiding the engaging member to move the member;
and forming an engagement opening that can engage with the notch,
It can also be applied to recoil starters with a structure that does not have a gear, and it also eliminates the need for a friction spring, which was conventionally used in this type of mechanism, reducing the number of parts and simplifying production. The present invention is characterized in that by directly engaging the member with the notch, the certainty and reliability of the anti-jumping action is ensured.

(Embodiment) The present invention will be described below with reference to an illustrated embodiment in which the engaging member of the recoil starter is disposed in a non-coaxial position with the engaged member on the engine side.
In the figure, 1 is a case, and a center shaft 2 is protruded from the center of the bottom surface of the case, and a reel 3 is rotatably supported on the shaft 2. A rope groove 4 is provided on the circumferential surface of the reel 3, and a rope 5 is wound and housed in the groove 4. A recoil spring 6 is attached to the inside of the reel 3.
is constantly biased in the winding direction of the rope 5.

Reference numeral 7 denotes a helical spline shaft integrally formed in the center of the reel 3, and a gear as an engaging member 8 is spline-fitted to a helical spline 7a formed on the circumferential surface of the shaft 7.
In the illustrated case, the gear 8 meshes with a gear serving as an engaged member 9 on the engine side during upward movement to transmit power, and a horizontally elongated engagement opening 10 is provided at a symmetrical position of the gear face 8a. 10 is formed, and a braking member 1 is inserted into the engaging openings 10, 10.
The leg pieces 12, 12 of 1 are engaged.

In the case of the embodiment, the braking member 11 is formed into a bowl shape, and cutout portions 13, 13 that open laterally are formed symmetrically with each other at the lower ends of the leg pieces 12, 12 that protrude at symmetrical positions. . 14 is a recess formed in the center of the brake member 11, which is accommodated in a recess 15 opened at the upper end of the helical spline shaft 7, and a through hole 16 is formed at the bottom of the recess 14;
A bolt 17 is attached to the center shaft 2 through the through hole 16. 18 is a brake spring inserted between the upper end of the center shaft 2 and the lower surface of the recess 14, and 19 is a reinforcing rib formed on the leg piece 12.

5 to 9 show other embodiments of the present invention, in which the same reference numerals are used for corresponding components as in the previous embodiments. Of these, Figures 5 and 6
The figure shows another embodiment of the braking member 11, and the one shown in the fifth figure has the leg piece 12 tilted slightly in the rotational direction of the braking member 11 and disposed obliquely, and the side opening edge of the notch 13. 13a are similarly formed, and these mouth edges 13
A and the side edge of the leg piece 12, the gear 8 is made to move smoothly and quickly, and the brake member 11 shown in FIG. It is characterized by the fact that it is designed to simplify the configuration and facilitate manufacturing.

7 to 9 show an embodiment of the present invention in which an engaging member 8 of a recoil starter is arranged coaxially with an engaged member 9 on the engine side, and the engaging member 8 is used instead of the gear described above. Using a rotating plate that is spline-fitted with the helical spline shaft 7,
Engagement protrusions 20, 20 are provided protrudingly at symmetrical positions on the rotary plate, and notch-shaped engagement ports 10, 10 are opened at symmetrical positions on the circumferential surface spaced apart from the protrusions 20, 20, and the mouth edges 10a, 10a can be engaged with a notch 13 of a braking member 11 and a side edge of a leg piece 12, which will be described later.

That is, the braking member 11 is formed into a substantially U-shape as shown in the figure, and is immovably fixed to the upper end of the center shaft 2 via a nut 21. 13 are formed symmetrically to each other. The engaged member 9 on the engine side is the engagement protrusion 20 instead of the gear described above.
An engagement plate is used which has a plurality of protruding engagement claws 22, 22 that can be engaged with.

As shown in FIG. 9a, the engaging member 8 normally has one mouth edge 10a, 10a with the notch 13, 13.
is engaged with the lateral mouth edges 13a, 13a of the holder, thereby preventing its upward movement or springing up. Then, when the reel 3 rotates during the starting operation and the helical spline shaft 7 integrated therewith rotates, the mouth edge 10a slips out from the side mouth edge 13a, and the upward movement position of the engaging member 8 is formed. Ru. Then, when the engaging member 8 starts to move upward and reaches its uppermost position as shown in FIG. transmits power to and starts the engine. After starting the engine,
When the engaged member 9 rotates at a high speed, the engaging member 8 descends to restore its original state as shown in FIG. 8a, and is prevented from jumping up thereafter.

As described above, this embodiment is suitable for a type of recoil starter in which the engaging member 8 does not use a gear type, but is arranged coaxially with the engaged member 9, and this prevents the engaging member 8 from jumping up. It is characterized by its simple structure.

(Function) The mechanism for preventing the engagement member from jumping up as described above is as shown in Fig. 4a before starting the recoil starter.
As shown in FIG.
is inserted into the engaging openings 10, 10 of the gear 8, and the upper opening edge 13b of the notch 13 is located directly above the opening edge 10a, so that the gear 8 can move in the circumferential direction and move upward. is being prevented. Therefore, even if the recoil starter receives a shock or is shaken, the engagement state between the engagement port 10 and the notch 13 is maintained.
Gear 8 holds the position in its lowest position.

Next, during a starting operation, when the rope 5 is pulled and the reel 3 is rotated against the recoil spring 6, the helical spline shaft 7 protruding from the reel 3 is rotated.
rotate together, and the gear 8 spline-fitted to the shaft 7 rotates. The gear 8 initially rotates slightly in the same direction as the reel 3, and the gear 8 rotates slightly in the same direction as the reel 3.
The opening edge 10a facing the opening 0a is engaged with the side edge of the leg 12 as shown in FIG. 4b, so that the engaging opening 10 is aligned directly below the leg 12.

In this way, the upward movement position of the gear 8 is formed, and when the reel 3 further rotates, the gear 8 begins to move upward along the helical spline 7a as shown in FIG. 4c, and the upper end surface of the boss 8b It continues to move upward until it comes into contact with the inner surface of the upper part of the braking member 11, and at its upward movement stop position, in other words, the uppermost position, it meshes with the gear 9 on the engine side as shown in FIG. 2, and the power is transmitted to the gear 9. do.

Therefore, gear 9 rotates in the opposite direction to gear 8, and the engine is started. After the engine is started, the gear 9 rotates at high speed to urge the gear 8 to move downward, and the rope handle (not shown) is released and the reel 3 is rewound by the recoil spring 6. As a result, the helical spline shaft 7 integrated with the reel 3 rotates in reverse, and the gear 8 spline-fitted to the shaft 7 begins to move downward.
During the downward movement, the gear 8 maintains a constant posture by engaging the mouth edge 10a of the engagement port 10 with the side edge of the leg piece 12,
When the lowermost position is reached, the upper edge 10a of the engagement port 10 is positioned directly below the upper edge 13b of the notch 13, as shown in FIG. 4d.

When the reel 3 further reverses in this situation, the gear 8 follows this and moves to the upper left in FIG.
The upper mouth edge 13b is positioned directly above the mouth edge 10a to prevent its upward movement. That is, the gear 8 returns to its original state as shown in FIG. 4a, and is prevented from jumping up.

In this way, the present invention can be applied to recoil starters that do not use a gear type as the engaging member 8, and can be used in a wide range of applications.
In order to prevent the engagement member 8 such as a gear from jumping up, it is not necessary to use a friction spring, which was conventionally often used in this type of mechanism, so the complicated processing of this spring is eliminated, and
The number of parts can be reduced by the omission.

Moreover, regarding this series of jump prevention,
Since the engaging member 8 is directly engaged with the notch 13 of the braking member 11, it is possible to eliminate the decrease or deterioration of the anti-jumping effect due to the unique structure of the friction spring interposed between the two as in the conventional case. Therefore, a reliable and stable prevention effect can be obtained.

(Effects of the invention) As described above, the mechanism for preventing the engaging member from jumping up in the recoil starter of the present invention includes a braking member disposed on the center shaft that rotatably supports the reel, and a notch formed on the side surface of the braking member. The recoil starter is provided with an engaging member that moves toward the engaged member on the engine side during a starting operation and engages with the member to enable starting the engine, the recoil starter comprising: An engagement port is formed that guides the movement of the member and is capable of engaging with the notch, and can be applied not only to recoil starters that use a gear system as the engagement member, but also to recoil starters that do not use this gear system. Since it has been made applicable, it has the effect of being applicable to a wide range of uses.

Moreover, the present invention eliminates the need for the friction spring that was commonly used in conventional mechanisms of this type, thereby reducing the number of parts and eliminating the complicated processing of the springs. This has the effect of making it easy to manufacture the mechanism.

In addition, in the present invention, an engaging member such as a gear is directly engaged with the notch of the braking member through the engaging port to prevent it from jumping up, so that the above-mentioned preventive action can be strengthened and the action can be ensured. This has the advantage that reliability can be ensured, and concerns about reduction in effectiveness and deterioration caused by the friction spring as a mediating member, which are conventional, can be eliminated.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing one embodiment of the present invention, showing the state before starting operation, Fig. 2 is a sectional view taken along line A-A' in Fig. Figures 4a to 4d are front views showing main parts of the operating state of the present invention in order of operation, and Figures 5 and 6 are front views showing an example of the braking member used in the present invention. FIG. 7 is a plan view showing the second embodiment of the present invention, showing the state before starting operation, and FIG.
A sectional view taken along line B' and FIGS. 9a and 9b are front views showing essential parts of the second embodiment in the operating state in the order of operation. 2... Center shaft, 3... Reel, 8...
...Engaging member, 9...Engaged member, 10...Engagement port, 11...Brake member, 13...Notch portion.

Claims (1)

[Scope of utility model registration request] A braking member is disposed on the center shaft that rotatably supports the reel, and a notch is formed on the side surface of the braking member, and the braking member moves toward the engaged member on the engine side during the starting operation and engages with the member. The recoil starter is equipped with an engaging member that can start the engine, and the engaging member is provided with an engaging opening that guides the movement of the member and is capable of engaging with the notch. A mechanism for preventing the engaging member from jumping up in a recoil starter.