JPH0118911Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a drive shaft locking device for a machine driven by receiving power from another device.

Conventionally, in machines that are driven by power obtained from a separate device, a coupling means such as a clutch is provided on the drive shaft so that the driving force can be switched on and off at will. In this case, the driven side of the drive shaft would become idling, causing a dangerous problem.

This invention was made with the aim of improving this problem, and is intended to provide a drive shaft locking device that reliably locks the driven side of the drive shaft when the coupling means is severed, thereby ensuring safety. .

This invention will be described in detail below with reference to an illustrated embodiment. In the figure, 1 is a drive shaft for extracting power from a device (not shown), and a coupling means (not shown) such as a clutch is interposed in the middle. A lock gear 2 is attached to the driven side. A frame 3 is installed near the gear 2, and a locking rack 4 is provided on the frame 3 so as to be movable in the direction of engagement and separation of the lock gear 2. The locking rack 4 is slidably housed in a guide member 5 provided on the frame 3 side, and its distal end is close to the locking gear 2, and its proximal end is attached to the frame 3. The tip of the piston rod 6a of the rack cylinder 6 is connected to the cylinder 6.
The lock gear is moved forward and backward in two directions.

A compression spring 7 is interposed between the spring seat 4a protruding from the base end of the locking rack 4 and the frame 3, and the compression spring 7 biases the locking rack 4 toward the locking gear. 6 is supplied with air from an air source 10 via a solenoid valve 9.

On the other hand, a locking hole 4b is formed in the side surface of the locking rack 4 at approximately the middle thereof.

A lock pin 1 is attached to the side of this lock hole 4b.
1 is provided movably in a direction orthogonal to the locking rack 4.

As shown in FIG. 3, the lock pin 11 is slidably supported by a guide bush 12 provided on the frame 3 side, and has a small diameter at the base end, and a piston of a lock cylinder 13 at the end. The tip of the rod 13a is connected. The locking cylinder 13 is attached to the frame 3 side, and is adapted to move the locking pin 11 forward and backward in the locking rack 4 directions, and the rod side chamber 1
Air is introduced into 3 ₁ from the factory airline through the conduit 14, and a compression spring is provided between the stepped portion 11a of the lock pin 11 and the lock cylinder 13 to bias the lock pin 11 in the lock rack 4 direction. 15 are interposed.

Since this invention has been described in detail above, when the coupling means provided on the drive shaft 1 is disconnected, air is supplied to the rack cylinder 6 to advance the locking rack 4 to the locking gear 2. The driven drive shaft can be locked at will. Also, when the factory is closed and the power is cut off, the locking rack 4 advances toward the locking gear 2 side and locks it due to the action of the compression spring 7, and as the pressure in the factory airline decreases, the compression spring 15 As a result of this action, the locking pin 11 advances toward the locking rack 4 and its tip is inserted into the locking hole 4b, so that the locking rack 4 can be reliably locked in the locked state.
As a result, the driven side of the drive shaft 1 can be completely locked, so there is no possibility that a machine driven by obtaining power from another device will start moving accidentally, and it is safe. Even if a large load or inertia is applied, the locking cylinder 6 firmly presses the locking rack 4 against the locking gear 4 to lock it, so that it can be reliably locked.

Furthermore, since the locking rack is locked by a locking pin, high reliability is achieved, as the lock will not come off even if the compression spring 7 becomes flat during long-term use.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, and FIG. 1 is a side view, FIG. 2 is a cross-sectional view taken along the line of FIG. 1, FIG. 3 is a cross-sectional view taken along the line of FIG. 2, and FIG. It is a piping diagram. 1 is a drive shaft, 2 is a lock gear, 4 is a lock rack, 4b is a lock hole, 6 is a rack cylinder, 11 is a lock pin, 13 is a lock cylinder, and 15 is a compression spring.

Claims (1)

[Scope of utility model registration request] Drive shaft 1 having a connecting means in the middle from another device
In a device that extracts power through
A locking gear 2 is provided on the driven side of the drive shaft 1,
A locking rack 4 is provided in the vicinity of this gear 2, which is biased toward the locking side by a compression spring 7, and which is moved forward and backward in the direction of the gear 2 by a rack cylinder 6 to lock it. A locking hole 4b is provided near the locking hole 4b, and the locking rack 4 is moved out by pressure introduced into the locking cylinder 13 and advanced toward the locking hole 4b by a compression spring 15 to lock the locking rack 4 in the locked position. A drive shaft locking device provided with a lock pin 11.