JPS6018305Y2 - chain breaker - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a chain breaker for dividing a roller chain at an appropriate position used in a motorcycle, industrial machine, or the like.

In Utility Model Application Publication No. 51 No. 158962, the inventor of the present invention
Screw pole 1 is screwed into the upper branch of the U-shaped main body with a stem protruding from one side so that it can be raised and lowered, and the screw
A rolling element is held in the recess at the lower end of the bolt, and the head of the bushing pin is loosely fitted to prevent it from falling off, and a bundle is rotatably connected to the upper end of the screw bolt via a ratchet mechanism, and The patent application has been filed for a roller chain separator in which a through hole is bored in the lower branch and a clamp screw is screwed into the lower branch so as to be able to move up and down, and the upper end of the clamp screw is made to correspond to the bushing pin.

However, with the above divider, if the ratchet bundle is returned when the tip of the bush pin is not in contact with the connecting pin of the roller chain, the screw bolt will also be released at the same time because there is no resistance on the screw bolt. Since it is reversed, the ratchet bundle cannot be freely reciprocated.

It has been found that the inability to freely rotate the bundle makes it inconvenient to handle it in a narrow space, such as when cutting a chain attached to a motorcycle.

This invention is a chain breaker proposed in view of the above circumstances.A ratchet mechanism with a click is provided at the upper end of the screw and bolt, and a set screw to prevent reverse rotation is attached to the screw and bolt. It has been improved so that it can freely reciprocate in either the left or right direction.

The embodiment will be described below with reference to the drawings. As shown in FIG. - Screw Holt 5 so that it can be moved up and down.

As shown in the enlarged view of the main part in FIG. 3, a bushing pin 8 is connected via a ball-shaped rolling element 7 loosely fitted into a recess 6 provided on the center of the lower end of this screw bolt 5. A split pin 9 is inserted below to prevent the bushing pin 8 from falling off.

Further, a vertical hole through which the bushing pin 8 passes is bored at the lower end of the screw hole 4, and a collar guide 10 is screwed therein.

At the upper end of the screw bolt 5, a ratchet wheel 11 is fixedly attached, and mounting plates 12, 12 are provided above and below via bearings (not shown), and a ratchet handle 13 is attached to the tip of the mounting plates 12, 12, which hold the ratchet wheel 11 firmly in place.

A click 16 having a working pawl 14 and a push pawl 15 is attached to the ratchet handle 13, one of which is engaged with the ratchet wheel 11.

The click 16 is a plate as shown in FIG. 2, and the recesses 17 and 18 provided on both sides of the base end are connected to the upper and lower mounting plates 12.
It is fixed by fitting it into one of a pair of pins 19 and 20 erected between the pins 19 and 12 and pulling it toward the handle 13 side by the spring 21.

A clamp screw 2 is attached to the lower branch 22 of the main body 2.
3 are screwed together so that they can be raised and lowered, and the bushing
A through hole 24 corresponding to the pin 8 is bored.

In addition, a screw hole 25 is provided on one side of the main body 2, and a set screw 26 screwed into the hole allows the plastic ball 2 to be inserted into the screw hole 25.
7 onto the screw bolt 5 to provide light resistance to the bolt 5.

This is to prevent the bolt 5 from reversing when the handle 13 is moved back and forth.

Next, I will explain how to use it.

First, hold the stem 1 with one hand, raise the clamp screw 23, place the roller chain a to be cut on the clamp screw 23, and fit the upper end of the connecting pin b into the vertical hole of the collar guide 10. hold the same value.

Then, push the claw 14 side of the click 16, fit the recess 18 into the pin 20, and engage the tip of the claw 14 of the click 16 with the ratchet wheel 11 as shown by the solid line in FIG. At the same time, tighten the ball 27 with the set screw 26.
is pressed by the screw/bolt 5.

Thereafter, the ratchet handle 13 is reciprocated from side to side, and the screw/bolt 5 is rotated clockwise to lower it.

In this case, if there is no resistance on bolt 5, handle 1
When the bolt 3 is returned to its original position, the bolt 5 also rotates backwards, making it impossible to reciprocate the handle 13.

Therefore, the handle 13 can only be reciprocated from side to side until resistance is generated when the bushing pin 8 comes into contact with the connecting pin b, and until then, the handle 13 can only be moved in one direction.

However, in the present invention, since the ball 27 is pressed against the screw/bolt 5 by the set screw 26, the bolt 5 will not reverse with a small force.

Therefore, even if the bushing pin 8 does not come into contact with the connecting pin b, the handle 13 can be freely reciprocated and the screw
It is possible to rotate the bolt 5.

In this way, the head 81 of the bushing pin 8 is pressed downward via the rolling element 7, and the tip of the bushing pin 8 strongly presses the connecting pin b of the roller chain a to clamp it. It is pushed out into the through hole 24 of the screw 23.

After removing the connecting pin b, press the pusher claw 15 side of the click 16 to fit the recessed part 17 into the pin 19, and as shown by the chain line in FIG. to engage.

Then, by reciprocating the handle 13, the screw
Bolt 4 now turns counterclockwise, so the bushing
It rises together with pin 7 and returns to the initial state.

Note that when the handle 13 is to be rotated to the right or left in one direction instead of reciprocating, the set screw 26 is loosened so that no pressing force is applied to the ball 27.

As explained above, in the present invention, a ratchet mechanism is provided at the upper end of the screw/bolt, and a reversal prevention mechanism is attached to the screw/bolt to provide a slight resistance by means of a set screw via a ball.

For this reason, even if the tip of the bushing pin is not in contact with the connecting pin of the roller chain, a slight resistance is applied to the screw/bolt, so even if the ratchet handle is returned, the screw/bolt will not reverse, so the ratchet The handle can be freely reciprocated.

Therefore, it becomes very easy to turn the handle when cutting a chino that is still attached to a motorcycle in a narrow place, for example, and has the great effect of significantly improving work efficiency.

[Brief Description of the Drawings] Figure 1 is a partially longitudinal front view showing the chino breaker of the present invention, Figure 2 is an enlarged plan view showing the ratchet mechanism, and Figure 3 is the connection between the screw bolt and bush pin. FIG. 3 is an enlarged vertical sectional view showing a portion. 1- Stem, 2- Main body, 3- Upper branch, 5- Screw/bolt, 7- Rolling element, 8- Bush pin, 11-
Ratchet wheel, 13-ratchet handle,
14-pull L 15-push pawl, 16-click, 22-lower branch, 23-clamp screw, 24 through hole, 26-set screw, 27-ball.

Claims (1)

[Scope of utility model registration request] A screw/bolt is screwed into the upper branch of a U-shaped main body with a stem protruding from one side so that it can rise and fall freely, and a rolling element is held in the recess at the lower end of the screw bolt to prevent the head of the bushing pin from falling off. A bundle is rotatably connected to the upper end of the screw/bolt via a ratchet mechanism, and a through hole is formed in the lower branch of the main body so that the clamp screw can be screwed up and down freely. In the chain breaker, the upper end of which corresponds to the bushing pin, a set screw that presses the screw and bolt through a ball is screwed onto one side of the main body, thereby creating a mechanism for preventing the screw and bolt from reversing. Comes with a cheno breaker.