JP2009023366A - Foot-operated parking brake device for industrial vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foot-operated parking brake device adopting a push/toe release method that can be implemented in an industrial vehicle. <P>SOLUTION: When a parking pedal 4 is foot-operated in the direction of an arrow A, a pedal arm 1 turns, and the operation state of a parking brake is locked by a lock mechanism 6. The pedal arm 1 is allowed to turn as a pressurizing face 7a lowers a pressurized face 14a. Thereafter, a release link 9 is lifted again to project on a turning trajectory of an engagement part 7. A locking face 14b becomes a state allowed to contact a locked face 7b and inhibits turning of the pedal arm 1 in the returning direction. A heel 22 of a foot 21 placed on the parking pedal 4 is matched with a release pedal 10. A driver presses down the release pedal 10 to separate the locking face 14b from the locked face 7b, and when the parking pedal 4 is pressed in, the lock of the operation state of the parking brake is released, the pedal arm 1 turns in the returning direction, and the parking brake is brought into a non-operating state. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a foot-operated parking brake device used in industrial vehicles such as forklifts or towing vehicles. In particular, the operation state of the parking brake is locked by depressing the parking pedal, and the lock can be released by depressing the parking pedal again ( Hereinafter, the present specification relates to a stepping type parking brake device (referred to as a push-to-release type).

  As is well known in the foot-operated parking brake device, when the driver steps on the parking pedal with his / her foot, the parking brake is activated, and the state is locked by a lock mechanism. The unlocking method includes a hand release method in which a driver operates a manual lever or a manual button and the push-to-release method described above. Many types of patent literature disclose foot-operated parking brake devices using these release methods.

As a stepping type parking brake device adopting a push-to-release method, for example, there is one disclosed in Patent Document 1. The pedal arm 17 of the foot-operated parking brake device is rotatably attached to a bracket 11 fixed to the vehicle body. The pedal arm 17 is connected to the parking brake control cable 20 on one end side and has a pedal pad 10 on the other end side. The other end of the parking brake control cable 20 is connected to a wheel brake mechanism (not shown). In Patent Document 1, a push-to-release system is employed in which when the pedal arm 17 is depressed, the parking brake is locked in the operating position by the lock mechanism, and when the pedal arm 17 is depressed again, the lock is released. The locking mechanism includes a number of ratchet teeth 23a arranged in a circular arc concentric with the rotating shaft 14 of the pedal arm 17, a pole 25 and a pedal that are rotatably attached to the pedal arm 17 and can be engaged with and disengaged from the ratchet teeth 23a. A release lever 27 is mounted on the arm 17 so as to be substantially concentric with the pole 25 and rotatable. The pole 25 and the release lever 27 are urged by the torsion spring 26 so as to rotate in opposite directions.
JP 2002-154212 A

  A foot-operated parking brake device employing a push-to-release system as disclosed in Patent Document 1 is often implemented in vehicles such as automobiles. On the other hand, for example, in a forklift, a stepping type parking brake device adopting a hand release type is generally implemented. However, the hand release type requires connecting parts such as a manual lever or a manual button and a wire for operating the parking brake locking mechanism, which increases the number of parts and has a cost demerit. Further, since a plurality of operation levers for cargo handling are provided around the driver's seat of the forklift, various arrangements are required for the position of the manual lever or the manual button. Furthermore, in order to release the parking brake locking mechanism, the driver must change his posture, extend one hand, and operate a manual lever or a manual button, which is inconvenient.

  An object of the present invention is to provide a foot-operated parking brake device that employs a push-to-release method that can be implemented in industrial vehicles.

  The present invention according to claim 1 is such that the parking brake operating state is locked by depressing a parking pedal of a pedal arm pivotably attached to a part of the vehicle body above the floor of the driver's seat, and the parking pedal is In a foot-operated parking brake device in an industrial vehicle having a lock mechanism that is unlocked when depressed again, the pedal arm engages with a part of the pedal arm when the operation state of the parking brake is locked An auxiliary lock mechanism for restricting the rotation in the return direction is provided, and a release pedal for releasing the restriction of the auxiliary lock mechanism is disposed in the vicinity of the parking pedal.

  According to the first aspect of the present invention, in order to return the pedal arm, a double lock system that requires the release of the auxiliary lock mechanism as well as the release of the lock mechanism is adopted, and both the locks are released by stepping on. By configuring so that it can be performed in the above manner, a foot-operated parking brake device adopting a push-to-release system can be implemented in an industrial vehicle.

  According to a second aspect of the present invention, an engagement portion is provided in a part of the pedal arm, and the auxiliary lock mechanism is rotatably attached to a lower floor of a driver's seat of the industrial vehicle and The release link is urged upward, and the release pedal is connected to the release link. The distal end of the release link protrudes on the turning locus of the engaging portion of the pedal arm, and the distal end of the release pedal Since the portion is disposed at a position that comes into contact with the driver's foot heel placed on the parking pedal when the lock is released, the auxiliary lock mechanism can be mechanically extremely simple, Moreover, since it can be buried under the floor of the driver's seat, it does not hinder normal operation of industrial vehicles. Further, since the lock mechanism and the auxiliary lock mechanism can be released with only one of the driver's feet, the operability can be improved as compared with the hand release type, and the number of parts can be reduced. You can expect cost merit.

  The present invention can implement a stepping type parking brake device adopting a push-to-release type in an industrial vehicle.

  Hereinafter, an embodiment of the present invention in a forklift will be described with reference to FIGS. 1 and 2. The pedal arm 1 of the foot-operated parking brake device is rotatably supported by a shaft 3 disposed above the floor 2 of the driver's seat. The pedal arm 1 is formed in an arc shape, and has a parking pedal 4 that touches the driver's foot at the end thereof. The pedal arm 1 is urged in the direction opposite to the arrow A by a spring (not shown).

  Therefore, when the driver steps on the parking pedal 4, the pedal arm 1 is rotated in the direction of arrow A to the position indicated by the solid line in FIG. 1, and a parking brake (not shown) is activated via the cable 5. At this time, the operation state of the parking brake is locked by the lock mechanism 6 that is operated by the rotation of the pedal arm 1. When the driver depresses the parking pedal 4 again, the locked state by the lock mechanism 6 is released, the pedal arm 1 is rotated in the direction of the opposite arrow A in FIG. 1 by the urging force of the spring, and the parking brake is in an inoperative state. To a position (a position indicated by an imaginary line in FIG. 1).

  An engaging portion 7 that protrudes toward the floor 2 is formed on a part of the lower surface of the pedal arm 1. The engaging portion 7 has a pressing surface 7 a facing the floor 2 and a locked surface 7 b facing the return direction of the pedal arm 1. The pressing surface 7a and the locked surface 7b are formed with a slightly curved convex surface and a concave surface in order to reduce resistance during sliding contact with a release link 9 of an auxiliary lock mechanism 8 described later.

  The auxiliary lock mechanism 8 is disposed in the lower part of the floor 2 and has a release link 9 and a release pedal 10 as a basic configuration. The release link 9 is formed of an L-shaped lever, and an end portion of the long side 11 is rotatably supported by a shaft 12 on a bracket 12 fixed to the lower surface of the floor 2. The distal end portion 14, which is the short side of the release link 9, extends toward the floor 2, and is disposed so as to be able to appear and retract above the floor 2 through a through hole 15 opened in the floor 2 below the pedal arm 1. Further, the release link 9 is urged toward the floor 2 by a spring 16 installed between the lower surface of the floor 2 and the long side 11, and the distal end portion 14 is a turning locus of the locked surface 7 b of the engaging portion 7. Projects to the top. The upper end side of the distal end portion 14 has a pressed surface 14 a that contacts the pressing surface 7 a of the engaging portion 7 and a locking surface 14 b that contacts the locked surface 7 b of the engaging portion 7. The pressed surface 14a and the locking surface 14b are formed as convex surfaces that are slightly curved in order to reduce resistance during sliding contact. Each member constituting the auxiliary lock mechanism 8 can be formed of a metallic material or a resinous material having a predetermined strength.

  The release pedal 10 is formed in a T shape by a pedal portion 17 and a support lever 18 integrated with the lower surface of the pedal portion 17. The lower end of the support lever 18 is rotatably connected to the long side 11 of the release link 9 by a shaft 19. The pedal portion 17 is disposed at a position where the through hole 20 formed in the floor 2 can be moved in the vertical direction. When the pedal arm 1 is in the state of the solid line in FIG. 1 and the driver's foot 21 is placed at the operating position of the parking pedal 4, the through hole 20 is opened at a position that coincides with the heel 22. As shown in FIG. 1, the upper surface of the pedal portion 17 passes through the through hole 20 of the floor 2 in a state where the release link 9 is pulled up by a spring and the locking surface 14b is in contact with the locked surface 7b. It protrudes slightly upward.

Next, the operation of this embodiment will be described.
When the driver stops the forklift and activates the parking brake, the driver depresses the parking pedal 4 at the imaginary line position in FIG. As the pedal arm 1 rotates, the cable 5 is pulled rightward in FIG. 1, and a parking brake (not shown) is activated. At the same time, the lock mechanism 6 is operated, and the operation state of the parking brake is locked.

  On the other hand, when the pedal arm 1 rotates in the direction of the arrow A, the release link 9 protruding on the rotation locus of the engaging portion 7 rotates the pressed surface 14a downward by the pressing surface 7a of the engaging portion 7. The pedal arm 1 is allowed to rotate. The release link 9 rises again by the urging force of the spring 16 after passing through the engaging portion 7, and protrudes on the rotation locus of the engaging portion 7. For this reason, the locking surface 14b of the release link 9 is brought into contact with or can be brought into contact with the locked surface 7b of the engaging portion 7, and is maintained in a posture capable of preventing the pedal arm 1 from rotating in the return direction. That is, the operating state of the parking brake is double-locked.

  After applying the parking brake, the driver can get off the forklift and perform a predetermined work. For example, the driver performs various tasks such as placing forklift luggage on the floor 2, unloading from the floor 2, opening the hood of the driver's seat, checking the interior, and checking and adjusting various operating devices in the driver's seat. I do. During these operations, the driver or luggage may touch or push the parking pedal 4. Even if the parking pedal 4 is inadvertently pushed and the locked state by the lock mechanism 6 is released, the locked surface 7b of the engaging portion 7 contacts the locking surface 14b of the release link 9, and the pedal arm 1 Is restricted. Accordingly, since the pedal arm 1 is prevented from rotating in the return direction by the auxiliary lock mechanism 8, the lock of the parking brake operating state can be substantially maintained.

  When the driver finishes the predetermined work, the driver gets on the driver's seat of the forklift and brings the foot 21 to the operating position of the parking pedal 4 as shown by the solid line in FIG. With the foot 21 touching the parking pedal 4, the heel 22 is in a position that coincides with the release pedal 10 of the auxiliary lock mechanism 8. When the driver puts a force on the rod 22 and depresses the release pedal 10, the release link 9 rotates downward, and the locking surface 14 b is detached from the locked surface 7 b of the engaging portion 7. Next, as shown by the phantom line in FIG. 2, when the driver pushes the parking pedal 4, the lock of the parking brake operating state by the lock mechanism 6 is released. The pedal arm 1 is rotated in the return direction by a biasing force of a spring (not shown), and the parking brake can be deactivated.

The above-described embodiment of the present invention has the following effects.
(1) Since the auxiliary lock mechanism 8 can be configured by a simple mechanical device, a foot-operated parking brake device that employs a push-to-release system in a forklift can be easily implemented.
(2) Since the auxiliary lock mechanism 8 is embedded in the lower part of the floor 2 of the driver's seat, it does not interfere with the driving operation of the forklift.
(3) Since the driver only needs to operate one foot, the operability is very good.
(4) Since the number of parts of the auxiliary lock mechanism 8 is small, there is a cost merit compared to the hand release type.

It is a partial sectional view showing an embodiment of the present invention. It is a partial cross section figure which shows the effect | action of embodiment of this invention.

Explanation of symbols

1 Pedal arm 2 Floor 4 Parking pedal
6 Locking mechanism 7 Engaging portion 7a Pressing surface 7b Non-locking surface 8 Auxiliary lock mechanism 9 Release link 10 Release pedal 14 Tip 14a Non-pressing surface 14b Locking surface 21 Foot 22 ２２

Claims (2)

A lock mechanism that locks the operating state of the parking brake by depressing the parking pedal of the pedal arm that is pivotally attached to a part of the vehicle body above the floor of the driver's seat, and unlocks when the parking pedal is depressed again In a foot-operated parking brake device in an industrial vehicle equipped with
An auxiliary lock mechanism is provided that engages a part of the pedal arm and restricts the rotation of the pedal arm in the return direction when the parking brake is locked, and releases the restriction of the auxiliary lock mechanism. A foot-operated parking brake device for an industrial vehicle, characterized in that a release pedal is disposed in the vicinity of the parking pedal. An engagement portion is provided on a part of the pedal arm,
The auxiliary lock mechanism includes a release link that is pivotally attached to a lower floor of a driver's seat of the industrial vehicle and is urged upward of the floor, and a release pedal connected to the release link. The tip of the link is projected on the rotation trajectory of the engaging part of the pedal arm, and the tip of the release pedal is placed at a position where it contacts the footpad of the driver placed on the parking pedal when the lock is released. The foot-operated parking brake device for an industrial vehicle according to claim 1, wherein the foot-operated parking brake device is provided.

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