JPS591663B2 - Cord winding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cord winding device used in a vacuum cleaner or the like.

2. Description of the Related Art Conventionally, there are various types of cord winding devices built into vacuum cleaners and the like for winding cords, and a typical one is shown in FIG. 1.

That is, a cord reel 3 around which a cord 2 is wound and an electric blower 4 are built into the rear part of the cleaner body 1. The cord reel 3 is rotatably held on a shaft 5, and one end of a mainspring 6 is fixed to the shaft 5. The cord reel 3 rotates in the negative direction as the cord 2 is stretched, and rotates in the opposite direction due to the restoring force of the mainspring 6 wound by the rotation, so that the cord 2 is automatically rewound. The rotation of the cord reel 3 in the direction of rewinding the cord 2 is regulated by a brake 7 connected to the cord reel 3, and the cord 2 is rewinded by operating the brake lever 8 and releasing the connection. It will be done. Two ring-shaped contact plates 10 to which one end of the cord 2 is connected are attached to the side plate 9 of the cord reel 3 at positions centered on the shaft 5. Two sliding contacts 11 connected to the electric blower 4 are always in elastic contact with the contact plate 10, one each. In this way, it is possible to energize the electric blower 4 through contact between the contact plate 10 and the sliding contact 11, but when the cord 2 is stretched or rewound, the contact plate 10 causes the cord reel 3 to rotate. Since it is in contact with the sliding contact 11 while rotating at the same time, it is subject to severe wear and may cause failure in energization, resulting in disadvantages such as a shortened lifespan of the component. The present invention was made in view of the above points, and it regulates the contact between the contact plate and the sliding contact, and in particular, restricts the contact between the contact plate and the sliding contact during rotation of the cord reel, thereby reducing the amount of wear and improving current conductivity. The object of the present invention is to provide a cord winding device that can maintain good quality and extend its life. The present invention includes a rotatable cord reel for winding a cord and an electric component in a main body case, and a contact plate attached to a side plate of the cord reel and connected to the cord and the electric component. A sliding contact is provided, and a contact/separation control section is provided for regulating contact/separation between the contact plate and the sliding contact by rotation of the cord reel.

Therefore, when the cord reel is rotated by stretching or rewinding the cord, the contact between the contact plate and the sliding contact is controlled by the contact/separation control unit, reducing the amount of wear on the contact plate and the sliding contact, and energizing them. It is designed to extend its life while maintaining good properties. A first embodiment of the present invention will be described based on FIGS. 2 to 4.

Incidentally, the same parts as those explained in FIG. 1 are indicated by the same reference numerals, and the explanation will be omitted (the same applies below). In this embodiment, the shaft 12 is formed into a split pin shape and holds the cord reel 3.
The fitting hole 14 of the holding plate 13 has the sliding contact 11 attached thereto.
A spring 16 is provided between the retaining ring 15 provided on the shaft 12 and the retaining plate 13 to bias the retaining plate 13 in a direction away from the cord reel 3. The contact/separation control section 17 is constructed by the following. In addition, in order to exaggerate the movement of the holding plate 13,
Although the taper of the shaft 12 is shown to be small, in practice, the taper is such that the holding plate 13 can be moved in the axial direction against the spring 16 by the opening force of the shaft 12.

Note that this taper may be applied only to the portion where the retainer plate 13 is present. In such a configuration, when the cord reel 3 stops rotating, as shown in FIGS. 2 and 3, the expanding force of the shaft 12 overcomes the urging force of the spring 16 on the retaining plate 13, and the retaining plate 13 stops at a position close to the cord reel 3, and the sliding contact 11 and the contact plate 10 come into contact, making it possible to energize the electric blower, which is an electrical component.

When the cord reel 3 rotates, that is, when the cord 2 is stretched, the cord reel 3 receives a lateral force, which applies lateral pressure to the shaft 12, causing the shaft 12 to contract in diameter and deform into a cylindrical shape. As a result, the connection between the shaft 12 and the fitting hole 14 is released, the retaining plate 13 is moved in a direction away from the cord reel 3 by the biasing force of the spring 16, and the sliding contact 11 and the contact plate 10 are separated. When the stretching or rewinding of the cord 2 is completed and the rotation of the cord reel 3 is stopped, the cord reel 3 returns to its original position, is disconnected from the shaft 12, and the shaft 12 is expanded again. This expansion causes the shaft 12 to join the fitting hole 14 and move the holding plate 13 in a direction approaching the cord reel 3, so that the sliding contact 11 and the contact plate 10 come into contact again. In this way, since the sliding contact 11 and the contact plate 10 are separated from each other when the cord reel 3 rotates, it is possible to prevent the sliding contact 11 and the contact plate 10 from being worn out, while maintaining conductivity during contact. It can extend the lifespan. Next, a second embodiment of the present invention will be explained based on FIGS. 5 to 7. In this embodiment, a holding plate 18 having a sliding contact 11 attached to a shaft 5 that rotatably holds the cord reel 3 is fixed at a position where the sliding contact 11 contacts the contact plate 10, and the cord reel 3 is Protrusion 1 formed in
A cam 20 is attached to the cord reel 3 due to the mutual friction between the protrusion 19 and the cam 20.
The contact/separation control section 21 is constructed by connecting the cord reel 3 and the sliding contact 11 so that only the cord reel 3 can rotate freely. The high part 22 of the cam 20 is sized and shaped so that it can be joined to both sliding contacts 11 at the same time. In such a configuration, when the cord reel 3 is not rotating, the cam 20 separates from the sliding contact 11 as shown in FIGS.
and the contact plate 10 come into contact with each other, making it possible to energize the electric blower. When the cord reel 3 is rotated, the cam 20 also rotates integrally and joins the sliding contact 11.
is bent in the direction away from the contact plate 10. and,
When the sliding contact 11 is separated from the contact plate 10 by a certain distance, the cam 20 stops rotating due to the pressing force received from the sliding contact 11 and remains at that position, and only the cord reel 3 continues to rotate. In this way, when the cord reel 3 rotates, the sliding contact 11 and the contact plate 10 can be separated from each other to prevent their wear, thereby extending their life while maintaining good electrical conductivity. I can do it. When the cord reel 3 stops rotating, the cam 20 is pushed back together with the cord reel 3 by the elasticity of the sliding contact 11, separating from the sliding contact 11, and the sliding contact 11 and the contact plate 10 come into contact again. . Next, a third embodiment of the present invention will be described based on FIGS. 8 to 10.

In this embodiment, a screw 23, which is a spiral groove, is formed on the shaft 5 that holds the cord reel 3, and a screw 25, which is a protrusion, is formed on the holding part 24 of the cord reel 3, and these are made to mesh with each other. This constitutes the contact/separation control section 26.
Note that a holding plate 18 to which a sliding contact 11 is attached is fixed to the end of the shaft. In such a configuration, when the cord 2 is unwound, the sliding contact 11 and the contact plate 10 are separated from each other as shown in FIGS. 8 and 9.

As the cord 2 is stretched, the cord reel 3 rotates and moves toward the retaining plate 18 due to the engagement between the screws 23 and 25. By stretching the cord 2 beyond a set value, the cord reel 3 rotates and moves toward the holding plate 18. When the contact plate 10 comes into contact with the electric blower, it becomes possible to energize the electric blower. Note that the set value is determined by the usage length of the cord 2, and is set to about 3 m for a vacuum cleaner. In this way, the sliding contact 11 and the contact plate 10 come into contact when the stretched length of the cord 2 reaches a set value or more, and when the stretched length is less than the set value, the cord 2 is stretched or rewound. Even when the cord reel 3 rotates, they do not come into contact with each other, so it is possible to prevent the sliding contact 11 and the contact plate 10 from wearing out, and to extend their life while maintaining good electrical conductivity. . Next, a fourth embodiment of the present invention will be described based on FIGS. 11 and 12.

In this embodiment, a screw 28, which is a helical groove, is formed in a case 27 that houses the cord reel 3.
A screw 29, which is a protrusion, is formed on the outer peripheral edge of the side plate 9, and the contact/separation control section 30 is constructed by engaging the screw 29. In such a configuration, when the cord 2 is rewound, the sliding contact 11 and the contact plate 10 are separated from each other as shown in FIG. 11.

As the cord 2 is expanded, the retainer plate 18 is engaged with the screws 28 and 29 as in the third embodiment.
When the cord reel 3 approaches and the stretched length of the cord 2 reaches a set value, the sliding contact 11 and the contact plate 10 come into contact. Therefore, when the stretched length of the cord 2 is less than the set value, the sliding contact 11 and the contact plate 10 are separated, and it is possible to prevent them from being worn out due to contact. It is possible to extend the life while maintaining good conductivity. Next, a fifth embodiment of the present invention will be described based on FIG. 13.

In this embodiment, a thread 33, which is a helical groove in which a coarse pitch 31 and a fine pitch 32 are continuous, is formed on the shaft 5 described in the second embodiment, and the holding portion 24 of the cord reel 3 is
A contact/separation control section 35 is constructed by forming a protrusion 34 as a protrusion and meshing these. In addition,
When the sliding contact 11 and the contact plate 10 are not in contact with each other, the protrusion 34 engages with the coarse pitch 31, and after contact, the protrusion 34 engages with the close pitch 32.
In such a configuration, when the sliding contact 11 and the contact plate 10 are separated from each other, the protrusion 34 is engaged with the coarse pitch 31, so that the cord reel 3 due to the stretching of the cord 2
Large lead per rotation, sliding contact 11 and contact plate 1
0, the protrusion 34 engages with the tight pitch 32, so the lead per cord reel 31 rotation due to the stretching of the cord 2 is small.

Therefore, cleaning can be performed even if the stretched length of the cord 2 is short by setting a small setting value, and after the sliding contact 11 and the contact plate 10 come into contact, the cord reel 3 It is possible to reduce the amount of movement in the direction of the axis 5 to slow the rise in pressure between them, and it is possible to prevent wear and damage between the sliding contact 11 and the contact plate 10, It is possible to extend the life while maintaining good conductivity. Incidentally, a helical groove having coarse pitch and close pitch parts is formed in the case 27 described in the fourth embodiment, and a protrusion that engages with the groove is provided on the outer peripheral edge of the side plate 9 of the cord reel 3. This may constitute a contact/separation control section.

Since the present invention is configured as described above, when the cord reel is rotated by stretching or rewinding the cord,
The contact/separation control section can regulate contact between the sliding contact and the contact plate, thereby preventing wear between the sliding contact and the contact plate, and improving conductivity between the sliding contact and the contact plate. This has the effect of extending the service life while maintaining good quality.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view showing a conventional example, and FIG. 2 is a perspective view showing a first embodiment of the present invention, in which a part of the approaching/disengaging control section is cut away when the cord reel stops rotating. FIG. 3 is a longitudinal sectional side view of the same, FIG. 4 is a longitudinal sectional side view of the cord reel when it is rotating, and FIG. 6 is a vertical sectional side view of the same, FIG. 7 is a vertical sectional side view of the cord reel when it is rotating, and FIG. 8 shows a third embodiment of the present invention, in which the cord is wound up. FIG. 9 is a perspective view of the contact/separation control section, FIG. 9 is a longitudinal sectional side view thereof, FIG. 10 is a longitudinal sectional view of the cord in a stretched state, and FIG. 11 shows a fourth embodiment of the present invention. A perspective view of the approach/separation control unit in a state where the cord is wound up;
FIG. 12 is a longitudinal sectional side view of the cord in a stretched state, and FIG. 13 is a longitudinal sectional side view of the approach/separation control section in a state where the cord is wound up, showing a fifth embodiment of the present invention. 2... Code, 3... Code reel,
9...Side plate, 10...Contact plate, 11.
... Sliding contact, 17 ... Contact/separation control section, 2
1... Approach/separation control section, 26... Approach/separation control section, 30... Approach/separation control section, 35... Approach/separation control section.

Claims (1)

[Scope of Claims] 1 A rotatable cord reel for winding a cord and an electric component are provided in a main body case, and a contact plate attached to a side plate of the cord reel and to which the cord is connected and the electric component are provided. A sliding contact to be connected is provided, and a contact/separation control unit is provided for causing the cord reel to idle by temporarily releasing contact between the contact plate and the sliding contact by rotation of the cord reel. Cord winding and storage. 2. A shaft formed in the shape of a cotter pin and whose diameter is reduced by receiving side pressure from a cord reel that rotates when the cord is pulled, a holding plate having a sliding contact point and attached to the shaft so as to be movable in the axial direction, and the sliding shaft. A spring biases the movable contact in a direction away from the contact plate, and the expansion force of the shaft moves the holding plate toward the contact plate to bring the sliding contact and the contact plate into contact. The cord winding device according to claim 1, further comprising a contact/separation control section. 3 A cam is provided that is connected to the sliding contact and receives the force of bending the sliding contact away from the contact plate by the frictional force with the cord reel, and when it is stationary, the cam receives the force from the sliding contact. The cord winding device according to claim 1, wherein the contact/separation control section is constructed by slightly rotating both the cam and the cord reel to bring the sliding contact into contact with the contact plate. . 4. A spiral groove is formed on the shaft that holds the cord reel, a protrusion is formed on the holding portion of the cord reel with the shaft, and the contact/separation control section is configured by meshing these parts. A cord winding device according to claim 1. 5. A spiral groove is formed in a case that houses a cord reel and has a sliding contact protruding from the cord reel side, and a protrusion is formed on the outer peripheral edge of the side plate provided with the contact plate of the cord reel. 2. The cord winding device according to claim 1, wherein the contact/separation control section is constructed by meshing the cords. 6. Claim 4, characterized in that the pitch of the spiral groove is formed at a coarse pitch and a fine pitch, so that when the sliding contact and the contact plate are in contact with each other, the threaded engagement is at a fine pitch. The cord winding device according to item 1 or 5.