JP3041949U - Drive wheel lock device for concrete cutter - Google Patents

Abstract

(57) [Abstract] [Problem] An object of the present invention is to prevent accidental running of a concrete cutter during parking. SOLUTION: A lock ring 7 having a receiving hole 8 in a peripheral wall is fixed to a shaft 6 of a drive wheel 4 of a concrete cutter 1, and a lock rod 11 inserted into the receiving hole 8 is attached to a frame 2 of the concrete cutter 1. The rotation of the drive shaft 6 is locked by inserting the lock rod 11 into the receiving hole 8.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a drive wheel lock device for preventing accidental running of a concrete cutter used for cutting a concrete paved surface of a road during parking.

[0002]

[Prior art]

 Conventionally, concrete cutters have not been equipped with a special drive wheel lock device. That is, the drive system of the conventional concrete cutter is composed of a worm gear attached to the power side and a worm wheel attached to the axle of the drive wheel. And since it is difficult to transmit power from the worm wheel to the worm gear side, if you park the worm gear and the worm wheel in a meshed state, they will effectively act as a brake and a special drive wheel lock device for parking. Was considered not necessary.

[0003]

[Problems to be solved by the device]

 By the way, concrete cutters are mainly used in road construction, but also in environments where pedestrians pass near the concrete cutters during construction. And, during breaks, workers often leave the machine and leave only the machine on site. In recent years, more reliable parking devices have been demanded as safety awareness has increased. Further, a drive system that does not use a worm, such as a hydraulic drive, has been adopted, and a simple and reliable parking device is required.

[0004]

[Means for Solving the Problems]

 The drive wheel locking device for a concrete cutter of this invention is a concrete cutter having a rotating cutter at the front part of the frame and a drive wheel at the rear part, in which a lock ring having a receiving hole in the peripheral wall is provided on the shaft of the drive wheel. A lock rod that is fixed and is inserted into the receiving hole so as to be inserted into and removed from the receiving hole is attached, and the rotation of the drive shaft is restricted by inserting the lock rod into the receiving hole. If the receiving holes of the lock ring are formed at a plurality of equal intervals, it is easy for the locking rod to enter the receiving holes. If the number is small, a long hole can be used to facilitate insertion of the lock rod. The lock rod has a structure in which it has a handle at its base end and is attached to a mounting cylinder that is fixed to the frame and has a spring inside, and if it is biased toward the lock ring by the spring, it will be inserted into the hole. The state is reliably maintained. In order to maintain the unlocked state during operation of the lock rod, a locking projection is provided at the base end and locked to the end surface of the mounting cylinder, but the locking projection is locked to the end surface of the mounting cylinder. If the locking groove is provided, there is no risk that the locking projection will be unlocked due to vibration during operation. Since the lock rod may be inserted into and removed from the receiving hole, for example, a screw rod may be used, and a screw may be formed inside the mounting cylinder so that the screw can be screwed.

[0005]

[Action]

 In this invention, if the tip end of the lock rod attached to the frame is inserted into the receiving hole of the lock ring fixed to the axle, the axle cannot rotate. Therefore, even if the concrete cutter is parked in the middle of the slope, the wheels do not rotate and move. During operation, if the lock rod is pulled out from the hole, the wheels are unlocked and can rotate.

[0006]

[Embodiment of the invention]

 A rotating cutter 3 is attached to the front part of a frame 2 of the concrete cutter 1, and a drive wheel 4 is attached to the rear part thereof. An engine 5 for driving the rotary cutter 3 and drive wheels 4 is mounted on the frame 2. A lock ring 7 is fixed to the drive shaft 6 of the drive wheel 4, and a plurality of receiving holes 8 are provided in the peripheral wall of the lock ring 7 at equal intervals. A mounting barrel 10 for a locking rod 11 is attached to the frame 2 via a bracket 9, and the mounting rod 10 is mounted at a position where the locking rod 11 can be inserted into and removed from the receiving hole of the lock ring 7. . A spring 12 is mounted in the mounting cylinder 10, and the spring 12 urges the lock rod 11 toward the lock ring 7. A locking projection 13 for locking the base end surface of the mounting cylinder 10 is diametrically provided at the base of the lock rod 11. The handle 14 of the lock rod 11 is grasped and pulled upward and rotated. The brake is released by engaging the stop projection 13 with the mounting cylinder 10. A vertical groove 15 is formed in the hollow portion of the mounting cylinder 10 so that the locking projection 13 can move, and the base end surface of the mounting cylinder 10 forms a right angle with the groove and locks. It is advisable to provide a locking groove (not shown) in which the convex portion 13 is locked.

In the above, during operation, the locking rod 11 is pulled up to lock the locking projection 13 in the locking groove. In this state, since the lock rod 11 is disengaged from the lock ring 7, the drive wheels can freely rotate. Also. If a locking groove is provided so that the locking projection 13 is locked in the locking groove, the lock rod 11 will not rotate due to vibration during operation, and the unlocked state will be maintained. When the rotation of the drive wheel is locked during parking, when the locking projection 13 of the lock rod 11 is released from the lock, the force of the spring 12 moves the lock rod 11 downward. Here, if the tip end position of the lock rod 11 coincides with the receiving hole 8 of the lock ring 7, the drive wheel 6 is locked by one operation. When the tip of the lock rod 11 does not coincide with the receiving hole 8, the concrete cutter 1 is moved slightly back and forth to slightly rotate the drive wheel 6. Since a large number of receiving holes 8 are provided, the tip of the lock rod 11 coincides with the receiving hole 8 with a slight movement, and is automatically inserted into the receiving hole 8 by the force of the spring 12, and the drive wheel 6 is locked.

[0008]

[Effect of the invention]

 According to this invention, the rotation of the drive wheel is securely locked by inserting the lock rod attached to the frame into the receiving hole of the lock ring fixed to the drive wheel axle to lock the rotation of the drive wheel axle. can do. Therefore, when the concrete cutter is placed in the middle of the slope to stop the operation, the drive wheels are locked, so that the concrete cutter does not move accidentally. Therefore, even if the worker leaves the site during breaks, the risk of accidents caused by the inadvertent movement of the concrete cutter is eliminated as much as possible. Also, the device of this invention is simple and can be attached to an existing concrete cutter.

[Brief description of the drawings]

FIG. 1 is a side view of a concrete cutter according to an embodiment of the present invention.

FIG. 2 is also a rear view.

FIG. 3 is a side view in which a part of a main part of the unlocked state is also shown.

FIG. 4 is a side view in which a part of a main part of the lock state is also shown in section.

[Explanation of symbols]

 1 Concrete Cutter 2 Frame 3 Rotating Cutter 4 Drive Wheel 5 Engine 6 Drive Shaft 7 Lock Ring 8 Receiving Hole 9 Bracket 10 Mounting Tube 11 Lock Rod 12 Spring 13 Locking Convex 14 Handle 15 Vertical Groove

Claims (3)

[Utility model registration claims] 1. A rotary cutter is provided at the front of the frame,
In a concrete cutter with a drive wheel at the rear,
By fixing a lock ring having a receiving hole in the peripheral wall to the shaft of the drive wheel, attaching a lock rod that is removably inserted into the receiving hole to the frame, and inserting the lock into the receiving hole. Drive wheel locking device for concrete cutters that locks the rotation of the drive shaft 2. The lock rod has a handle at its base end, is attached to a mounting cylinder fixed to a frame and having a spring inside,
2. The lock spring is biased toward the lock ring side, and the base of the lock rod has a locking projection that locks the end face of the mounting cylinder and holds the lock rod at the unlocked position of the drive wheel. Drive Wheel Lock Device for Concrete Cutter 3. The drive wheel locking device for a concrete cutter according to claim 2, wherein a groove with which the locking projection of the lock rod is locked is formed on the end surface of the mounting cylinder.