JP2001107987A - One-way clutch, and cargo carrying cart equipped with the clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow or prevent rotation in any direction. SOLUTION: Normally/reversely rotating teeth 16 are formed on a ratchet 12, and locking claws 21, locked to respective teeth 16 of the ratchet 12 to allow only normal or reverse rotation, are formed respectively on a claw member 13. The member 13 is energized by an energizing member 14 to lock the appropriate claw 21 to the tooth 16 corresponding to the ratchet 12, and the member 14 is pressably contacted by an actuating member 15, thereby deciding an energizing direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-way clutch and a luggage carrier equipped with the one-way clutch.

[0002]

2. Description of the Related Art Conventionally, a one-way clutch has a structure in which one of the rotations is permitted and the other is prevented from rotating.

[0003]

However, in the conventional one-way clutch, the direction in which rotation is permitted and the direction in which rotation is prohibited cannot be changed.

Accordingly, an object of the present invention is to provide a one-way clutch capable of allowing or preventing rotation in any direction and a luggage carrier having the one-way clutch.

[0005]

According to the present invention, as a means for solving the above-mentioned problems, a one-way clutch is engaged with a ratchet having teeth for normal rotation and reverse rotation and each tooth of the ratchet. Claw members each having a locking claw that allows only forward rotation or reverse rotation, and a biasing member that biases the claw member to lock the corresponding locking claw to a corresponding tooth of the ratchet. And an actuating member for determining the urging direction by pressing the urging member.

With this configuration, when the operating member is operated in a state where one of the locking claws is locked to one of the teeth of the ratchet, the biasing direction of the claw member by the biasing member is changed, and the other locking is performed. The pawl engages the other tooth of the ratchet. Therefore, the direction in which rotation is permitted or prevented is reversed.

The one-way clutch having the above-described structure is provided on an axle, and the operating member is constituted by a rod slidably provided along the axle.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a luggage carrier according to the present embodiment. This luggage carrier has a drive unit 2 a on the lower surface on the front side of the luggage carrier 1. The drive unit 2a has an axle 3
Is rotatably penetrated. Wheels 5 a are provided at both ends of the axle 3 via a one-way clutch 4.

As shown in FIG. 2, the drive unit 2a incorporates a traveling motor 6 and a switching motor 7. When the traveling motor 6 is driven, the axle 3 rotates through the sprocket 8 and a chain (not shown). When the switching motor 7 is driven, the auxiliary arm 9 rotates and the link 10 swings, so that both the operating members 15 of the one-way clutch 4 slide inward or outward at the same time via the clutch arm 11. Has become.

As shown in FIG. 3, the one-way clutch 4 includes a ratchet 12, a pawl member 13, a biasing member 14, and an operating member 15.

The ratchet 12 has, on its outer periphery, a first ratchet 17 provided with normal rotation teeth 16a projecting counterclockwise and a second ratchet 18 provided with reverse rotation teeth 16b projecting clockwise. Are integrated.
The ratchet 12 has a spline groove (not shown) formed in the center hole 19 and is integrally rotated by inserting a spline (not shown) formed at an end of the axle 3.
Note that bearings 20 that rotatably support the wheels 5a are provided on both sides of the ratchet 12, respectively.

The claw member 13 has locking claws 21a, 2 at both ends.
1b, and is provided on the wheel case 22 so as to be rotatable about a support shaft 22a. The locking claw 21a
The first ratchet 17 is engaged with the teeth 16a of the first ratchet 17 to allow only the forward rotation (clockwise in FIG. 3A) of the ratchet 12. On the other hand, the locking claw 21b is locked to the teeth 16b of the second ratchet 18, and allows only the reverse rotation of the ratchet 12 (counterclockwise in FIG. 3B).

The urging member 14 is connected to the support shaft 2 of the wheel case 22.
2b, each arm 23a, 23b urges each end of the claw member 13 so that each of the locking claws 21a, 21b has a corresponding one of the teeth 16a,
16b.

The operating member 15 has a cylindrical shape,
The second cylindrical portion 22c is slidably provided. One end of the operating member 15 is provided with a disc-shaped clutch shifter 2.
4 and a pair of shifter pins 25a, 25b protruding from the clutch shifter 24 and inserted into the wheel case 22.
have. The one shifter pin 25a has its arm portion 23a
The pusher 26a for pressing the arm 23b of the urging member 14 is formed in the middle part by removing the tip of the other shifter pin 25b. The operating member 15 is connected to the cylindrical portion 2 of the wheel case 22.
By moving inward along 2c, the pressing portion 26
a, 26b, the corresponding arms 23 of the biasing member 14
a, 23b are pressed. As a result, the urging member 14 rotates about the support shaft 22b, and the claw member 13 rotates about the support shaft 22a by the arms 23a and 23b.
1a or 21b locks on the corresponding tooth 16a or 16b of the ratchet 12.

As shown in FIG. 1, the luggage carrier has an operation handle 27 on the rear upper surface of the carrier 1 and a sensor unit 2b having a pair of pressure sensors 28a and 28b on the rear lower surface. It is arranged. Two casters 5b are provided on the lower surface of the sensor unit 2b.

The operation handle 27 is a substantially U-shaped metal pipe, and both ends are fixed to a support shaft 27a. The operation handle 27 is provided with a changeover switch (not shown) operated by a user. When the changeover switch is operated, the changeover motor 7 is driven, and the operating member 15 of the one-way clutch 4 slides via the auxiliary arm 9, the link 10 and the clutch arm 11. Thereby, the locking claw 21 of the claw member 13
a or 21b is the tooth 16a or 16 of the first ratchet 17
b, and the reverse rotation or forward rotation of the axle 3, that is, the wheels 5, is prevented. The support shaft 27a is rotatably supported by support pieces 29 provided on both sides of the upper surface of the carrier 1. Support shaft 27a
As shown in FIG. 4, two sensor brackets 30a and 30b are provided in the middle portion of the sensor bracket. Each of the sensor brackets 30a and 30b protrudes below the loading platform 1, and can press the pressure sensors 28a and 28b via adjustment bolts 31a and 31b provided there. The adjustment bolts 31a and 31b are adjusted so as to eliminate a gap between the pressure sensors 28a and 28b.

As shown in FIG. 5, the pressure sensor 28 comprises a cylinder 32 and a sensor section 33 which is perpendicular to the cylinder 32. A piston 34 is provided in the cylinder 32,
The pressing force from the sensor brackets 30a, 30b (adjustment bolts) acts on the sensor unit 33 via hydraulic oil. The sensor unit 33 detects this oil pressure and outputs it to a control unit (not shown). When the detected pressure exceeds a preset threshold, the control unit drives the switching motor 7 in the drive unit 2a to restrict the rotatable direction of the axle 3, that is, the wheel 5, and drives the traveling motor 6 By doing so, the load during the movement of the luggage carrier is reduced.

Next, the operation of the luggage carrier having the above configuration will be described.

The luggage is placed on the bed 1 and the operation handle 27
Is pushed forward, the pressing force acting on the pressure sensor 28a via the sensor bracket 30a increases. When the pressing force exceeds a predetermined threshold, the traveling motor 6 is driven, and the axle 3 rotates forward via the sprocket 8 and the chain.
This makes it possible to reduce the load when the carrier 1 is advanced through the operation handle 27. At this time,
By operating the changeover switch provided on the operation handle 27 and driving the changeover motor 7, the operating member 15 of the one-way clutch 4 is moved inward via the auxiliary arm 9, the link 10, and the clutch arm 11. You may leave. As a result, the locking claw 21a of the claw member 13 is locked to the teeth 16a of the first ratchet 17, and the reverse rotation of the axle 3, that is, the wheel 5, is prevented, and the rearward of the carrier 1 (or the downward side if the vehicle is on an uphill). Movement can be reliably prevented.

When the carrier 1 is moved rearward, the pressure detected by the pressure sensor 28b increases via the sensor bracket 30b, so that the traveling motor 6 rotates in the reverse direction to assist the rearward movement. At this time, the changeover switch may be operated to drive the switching motor 7 to move the operating member 15 outward. Thereby, the locking claw 21b of the claw member 13 is locked to the teeth 16b of the first ratchet 17, and the normal rotation of the axle 3, that is, the wheel 5, is prevented.

[0022]

As is apparent from the above description, according to the one-way clutch according to the present invention, since the ratchet teeth and the locking claws of the claw members are provided with two types of normal rotation and reverse rotation, the operating member is provided. By simply operating and changing the biasing direction of the biasing member, the rotation permitting or blocking direction can be easily changed.

[Brief description of the drawings]

FIG. 1 is a front view of a luggage carrier according to an embodiment.

FIG. 2 is a side view showing a front wheel of FIG. 1;

FIG. 3A is a front view showing the wheel shown in FIG. 2, and FIG.
It is a fragmentary sectional view (c) showing an example of another shifter pin which does not appear in a line sectional view (b) and (b).

FIG. 4 is a partially enlarged view (a) showing a rear wheel of FIG. 1 and a side view (b) thereof.

FIG. 5 is a sectional view of the pressure sensor shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Luggage carrier 2 ... Drive unit 3 ... Axle 4 ... One way clutch 5 ... Wheel 6 ... Traveling motor 7 ... Switching motor 12 ... Ratchet 13 ... Claw member 14 ... Urging member 15 ... Actuating member 16a, 16b ... Teeth 17 ... 1st ratchet 18 ... 2nd ratchet 21a, 21b ... Locking claw 22 ... Wheel case 24 ... Clutch shifter 25a, 25b ... Shifter pin 27 ... Operating handle 28a, 28b ... Pressure sensor 31a, 31b ... Adjustment bolt

Claims (2)

[Claims] 1. A ratchet having teeth for normal rotation and reverse rotation formed thereon, a claw member provided with a locking claw that is locked to each tooth of the ratchet and allows only normal rotation or reverse rotation, and the claw. A biasing member for biasing the member to lock the corresponding locking claw on a corresponding tooth of the ratchet; and an operating member for pressing the biasing member to determine a biasing direction. Features a one-way clutch. 2. A luggage carrier having a one-way clutch according to claim 1 provided on an axle, wherein said operating member comprises a rod slidably provided along the axle.