JPS5817153Y2 - chientensiyona - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a cheno tensioner that has been improved to have a simple structure and to be manufactured at low cost.

As a cheno stretches and loosens with use, it vibrates and makes noise, so a cheno tensioner is installed to keep it tensioned at all times.

Some tensioners automatically move forward according to the length of the tensioner and always maintain a good tension, but there are many components and the machining required to maintain high precision is complicated and expensive. There is.

In view of these points, this invention has been improved so that the structure is simple and inexpensive, and automatic extrusion is possible.Examples of the invention shown in the drawings will be described below.

An arm piece 3 is rotatably attached to a holding frame 1 with a shaft 2.

Then, a coiled spring 4 is stored between the holding frame 1 and the arm piece 3, and both ends are latched to bias the arm piece 3 in the rotational direction.

Further, a ball 6 is attached to an elastic piece 5 such as rubber, one end of the elastic piece 5 is fixed to the holding frame 1, and the ball 6 is inserted between the ball holding frame 1 and the arm piece 3.

The holding frame 1 is attached to the case 7 with screws, etc., and one end is swingably attached to the shaft 8, and the tip of the arm piece 3 is connected to the end of the guide rail 10, which is made to run along the chino 9. do.

The screw 11 is to be hooked onto and removed from the end of the arm piece 3.

・Explain the action.

Pull up the ball 6 against the elastic piece 5, and attach the arm piece 3 to the spring 4.
Hook the screw 11 to the arm piece 3 against the force.

In this set state, the guide rail 10 is connected to the tip of the arm piece 3.

When the screw 11 is released from the arm piece 3, the arm piece 3 rotates in the direction shown by the arrow by the elasticity of the spring 4, pushes out the guide rail 10 toward the chain 9, and tensions the chain 9.

When the chain 9 loosens, the arm piece 3 moves forward by that amount to maintain the tension of the chain 9.

Even if torque is applied to the chain 9 and force is applied in the direction of returning the arm piece 3, the ball 6 will bite between the holding frame 1 and the arm piece 3, and the arm piece 3 will not rotate in the opposite direction. The tension of Cheno 9 is maintained.

In this way, the arm piece 3 moves forward by the amount that the chain 9 is loosened, and automatically tensions the chain 9.

As explained above, in this invention, the arm piece is rotatably attached to the holding frame using a shaft, and both ends of the springs stored between the holding frame and the arm piece are hooked to rotate the arm piece. A ball held by an elastic piece was inserted between the arm piece and the holding piece, and one end of the guide rail that ran along the chain was connected to the tip of the arm piece, so that the ball could be bent by the amount that the chain was loosened. The spring moves the arm forward and pushes the guide rail, automatically keeping the cheno tensioned.

The ball then bites into the space between the holding frame and the arm piece, thereby preventing the arm piece from returning.

The main parts, the holding frame and the arm pieces, can be made by press-forming steel plates, and the detent is only used to stop the ball on the elastic piece, so it can be manufactured at low cost, resulting in a significant cost reduction.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, with Figure 1 being a longitudinal sectional view and Figure 2 being a longitudinal sectional view.
The figure is a cross-sectional view taken along the line A-A in FIG. 1... Holding frame, 2... Shaft, 3...
... Arm piece, 4 ... Spring, 5 ... Elastic piece, 6 ... Ball, 9 ... Cheno, 10
...Guide rail.

Claims (1)

[Scope of utility model registration request] The arm piece is rotatably attached to the holding frame with a shaft, and both ends of the springs stored between the holding frame and the arm piece are latched to bias the arm piece in the direction of rotation, and the arm piece and the arm piece are held together. A chain tensioner characterized in that a ball held by an elastic piece is elastically inserted between the frame and the frame, and one end of a guide rail running along the chain is connected to the tip of the arm piece.