JPS60139B2 - Cotter pin bending device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for automatically bending a retaining cotter pin attached to a chain link.

In the conventional cotter pin bending device, when bending the cotter pin 2 inserted facing the outside of the chain ring as shown in FIG. 1, the long leg 2a of the cotter pin 2 is positioned upward;
The bending claw 3 formed in a tapered shape was lowered between the split pins 2 and bent downward (FIG. 2), and then the bending claw 3 was raised to bend the long leg 2a upward.

However, in such a device, when pressing and bending the cotter pin 2 with the bending claw 3, the tapered portion 3 provided on the bending claw 3
Due to a, a component of the downward pressing force acts in the longitudinal direction of the cotter pin 2.Therefore, there is a risk that the cotter pin 2 may come off.
Therefore, as shown in FIGS. 1 and 2, it is necessary to provide a split pin guide 4 integrally with the bending claw 3 to support the head of the split pin 2. In addition, the bending claw 3 bends the long leg 2a and the short leg 2b at the same time when descending, and if the diameter of the split pin 2 becomes large, a huge amount of force is required as a pressing force, which affects the entire device, especially the split pin guide 4. Reinforcement is required. Furthermore, springback is used to remove the long leg 2a from the bending claw 3, and as the diameter of the cotter pin 2 increases, the springback effect cannot be expected. The present invention solves the drawbacks of the conventional devices described above, and provides a split pin bending device that prevents the split pin from being pulled out and can reliably bend even a large diameter split pin with a relatively small pressing force. The purpose is to

Embodiments of the invention will be described with reference to the drawings.

FIG. 1 is a front view of a device showing an embodiment of the invention.
In the figure, a chain feeding device 6 and a pin link unit fixing device 7 are provided on the table 5 near the left end. A bending device 8 is provided which reciprocates approximately perpendicular to the above device. Next, details of the bending device 8 will be explained with reference to FIGS. 4 and 5. In both figures, 9 is a holding rod, which is provided slidably at right angles to the longitudinal direction of the table 5 shown in FIG.
A cylinder 10 is connected to the rear end. A fixing claw 11 is attached to the front end of the holding rod 9. The fixing claw 11 is formed to have a substantially rectangular cross section as shown in FIGS. 4 and 5, for example, and its middle dimension D is equal to the short leg 2b of the split pin 2 inserted into the pin link unit 12 as shown in FIG. , 2b, and larger than the distance between the long legs 2a, 2a. The front surface of the fixing claw 11 is provided with an extrusion surface 11a to support the long leg 2a of the split pin 2. Next, a movable claw 12 is interposed within the fixed claw 11 so as to be movable in a direction perpendicular to the reciprocating direction of the fixed claw 11. 13 is a spring;
The movable claw 12 is attached so as to be expanded outward at all times.

Reference numeral 14 denotes a locking tool, which is fixed approximately in the middle of the movable claw 12.

Therefore, the movable claw 12 has a sloped or curved surface 12 on its front surface.
Provide a. Next, the case where split pin bending is performed using the above configuration will be explained with reference to FIGS. 6 to 8.

First, in FIG. 3, the pin link unit 12 into which the split pin 2 has been inserted is fed by the feeding device 6, and when it reaches just before the bending device 8, the fixing device 7 is activated and the pin link unit 1 is
2 is fixed on the table 5. Next, the bending device 8 is operated, and as shown in FIG. 6, the holding bar 9 connected to the cylinder I moves in the direction of the arrow. The middle dimension D of the fixed claw 11 is formed to be slightly smaller than the distance d between the short legs 2b and 2b of the split pin 2, so the fixed claw 11
As shown in FIG.
1a and proceed forward. (On the extrusion surface 11a, there is a fourth
, 5, the long legs of the cotter pin can be bent along the link plate even if the end faces of the long legs of the cotter pin are inclined in any direction. ) In this case, a force in the right angle direction is applied to the movable claw 12 due to its sloped surface or curved surface 12a, and the spring 1
It sinks into the fixing claw 11 against the spreading force of No. 3 and passes through. After passing the short leg 2b, it is opened again by the spreading force of the spring 13, and the movable claw 12 connects to the fixed claw 1 in front of the short leg 2b.
It stands out from 1. Next, when the holding bar 9 is moved in the direction of the arrow from this state, the movable claw 12 bends the short leg 2b and opens the split pin 2 as shown in FIG. When the split pin bending is completed, the fixing device 7 is opened in FIG. 3, and the feeding device 6 is operated to feed the next pin link unit. As described above, this invention provides the reciprocating device with the long legs and short legs of the cotter pin and the supporting fixed claws and movable claws, thereby eliminating the component force acting in the direction of inserting the cotter pin and maximizing the force. Since the legs and short legs are bent separately, the bending work is easy and reliable even for large diameter split pins.

[Brief explanation of drawings]

FIGS. 1 and 2 are plan views of essential parts of a conventional device, FIG. 3 is a front view of an embodiment of the present invention, and FIGS. 4 and 5 are plan views of essential parts of an embodiment of the present invention. The oblique view, the oblique bottom view, and FIGS. 6 to 8 are plan views for explaining the operation, respectively. 9: Holding rod, 11: Fixed claw, 12: Movable claw, 13: Spring. O' Figure O 2 Figure Sai 3 Figure Juice 4 Figure Conflict Figure O 6 Figure Off Figure O 8 Figure

Claims (1)

[Scope of Claims] 1. In a device for bending a cotter pin inserted opposite to the outside of a chain link, a holding rod reciprocating in a direction perpendicular to the cotter pin insertion direction has long legs of the cotter pin facing each other. A fixed claw with an extruded surface on the front facing the protruding part from the end of the short leg is provided, and a movable claw with a slope on the front side of the fixed claw extends between the short leg of the cotter pin and the bent long leg. A cotter pin bending device characterized in that it is provided so that it can appear and disappear at will. 2. The cotter pin bending device according to item 1, characterized in that a step is provided at the upper part of the extrusion surface facing the cotter pin.