JPH04122759U - pin fixing device - Google Patents

Abstract

(57) [Summary] [Purpose] In the conventional pin fixing device, the fixing boss that protrudes from the outside of the bracket is formed in a cylindrical shape, making it difficult to fit an elastic ring. . When enlarging the inner diameter of the ring with a large force against the elastic force of the ring, the ring hooked in the groove could come off and fly off, which was dangerous. The present invention aims to solve the above problems. [Structure] The shape of the boss on the outside of the concave groove of the fixing boss protruding from the outside of the bracket is formed into a tapered shape toward the outside, and the outer diameter of the outer end surface of the fixing boss is set to The diameter was set smaller than the inner diameter of the Further, a protrusion is fixedly provided at a position between the concave groove and the outer end of the fixing boss. [Selection diagram] Figure 1

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is mainly used for work attachments attached to construction machinery such as hydraulic excavators. The present invention relates to a pin fixing device for a pin joint portion.

0002

[Conventional technology]

Figure 5 shows a work attachment mounted on the front part of a hydraulic excavator (not shown). FIG. In the figure, 2 is the boom of work attachment 1; 3 is an arm, 4 is a bucket, 5 is a push rod, 6 is an idler link, 7 and 8 are connection pins. FIG. 6 is a sectional view taken along line A-A in FIG. . In the figure, 9 is the boss at the tip of arm 3, and 10 is fitted inside the left and right sides of boss 9. Bush, 11 is a bracket installed on the back of bucket 4, 12 is a pin fixing device. It is a place.

0003 FIG. 7 is a detailed view of part B in FIG. 6. In the figure, 13 is the outside of the bracket 11. A fixing boss 14 is a concave groove formed on the outer periphery of the fixing boss 13. and 16 are through holes passing through the fixing boss 13 and the pin 7, 17 is a lock pin, and 18 is a through hole that passes through the fixing boss 13 and the pin 7; is an elastic link. FIG. 8 is a sectional view taken along line CC in FIG. In the figure , 19 is a positioning pin for positioning the split part A of the ring 18. . 9 is a partially cutaway plan view seen from D in FIG. 7. FIG.

0004 In the conventional pin fixing device 12, the boss 9 is connected to the bracket 11 via the pin 7. The pins 7 can be rotatably connected to each other, and one end of the pin 7 can be inserted into the outside of the bracket 11. A fixing boss 13 is provided protrudingly, and a concave groove 14 is formed around the entire circumference of the fixing boss 13. A hole is provided in the fixing boss 13 and the pin 7 to pass through the groove 14 in the diametrical direction. Through-holes 15 and 16 are drilled, and lock pins 17 are fitted into the through-holes 15 and 16. At the same time, an elastic ring 18 is fitted into the groove 14 to remove the ring. Both ends of the lock pin 17 are held by the pin 18.

[0005]

[Problem that the idea aims to solve]

In the conventional pin fixing device, the fixing boss protrudes from the outside of the bracket. As shown in FIG. 9, it was formed into a cylindrical shape with an outer diameter D. For that reason, the pin When fixing, insert the lock pin, hook part of the ring into the groove, and secure the other part. Even if you try to fit it with a driver tool, the corner of the outer end surface of the fixing boss (the mark shown in Figure 9) It was difficult to fit it in because the part numbered B) protruded greatly. Also, the elastic force of the ring When expanding the inner diameter of the ring with a large force against the There was a risk that it would fall out of the groove and jump. This invention solves the above problems The purpose is to

[0006]

[Means to solve the problem]

This invention has a boss shape that is outside the concave groove of the fixing boss that protrudes from the outside of the bracket. is formed into a tapered shape toward the outside, and the outer diameter dimension of the outer end surface of the fixing boss is was set smaller than the inner diameter of the ring. In addition, the elastic ring can be recessed. To prevent one end of the ring hooked into a part of the groove from coming off, attach the outer edge of the concave groove of the fixing boss. A protrusion was fixed at a position between the two.

[0007]

【Example】

FIG. 1 is a sectional view of a pin fixing device 20 according to claim 1 of the present invention. In the figure, Components that use the same components as those in the prior art are given the same reference numerals. 21 is the bracket 22 is a taper formed on the fixing boss 22. The shaped part 14' is a concave groove provided all around the outer circumference of the fixing boss 21, and 15' is a fixed part. This is a through hole opened in the diametrical direction of the regular boss 21. Figure 2 is a flat view seen from E in Figure 1. Although this is a top view, it is attempted to fit the ring 18 in the axial direction from the outside of the fixing boss 21. Indicates the starting state.

[0008] Next, the configuration of the pin fixing device 20 according to claim 1 of the present invention will be described with reference to FIGS. 1 and 2. Ru. In the pin fixing device 20, the shape of the boss on the outside of the concave groove 14' of the fixing boss 21 is It is formed into a tapered shape (referring to the tapered part 22) toward the outside, and is used for fixing it. The outer diameter dimension d1 of the outer end surface of the boss 21 is set to be smaller than the inner diameter dimension d2 of the ring 18. Established.

[0009] Next, the operation of the pin fixing device 20 according to claim 1 of the present invention will be described. ring 18 When fitting the ring 18 onto the fixing boss 21, first fit the inner diameter of the ring 18 onto the fixing boss 21. You can face the outer end of 1. In other words, the outer diameter of the outer end surface of the fixing boss 21 Since the diameter dimension d1 is set smaller than the inner diameter dimension d2 of the ring 18, the ring diameter as shown in Fig. 2 is The insertion start position of the plug 18 can be quickly determined. Then, attach the ring 18 to the fixing boss 2 When the ring 18 is inserted in the axial direction from the outside to the inside, the ring 18 becomes a tapered part. Since the inner diameter increases along the line 22, the ring 18 can be easily fitted into the groove 14'. . In this case, this is especially true for pin fixing devices that use rings with relatively low elasticity. The effect is large.

0010 Next, FIG. 3 shows the state when the ring 18 of the pin fixing device 20' according to claim 2 of the present invention starts to be fitted. FIG. In the figure, the same configuration elements as the pin fixing device 20 of claim 1 are shown. The same symbols are given to those that use prime elements. 23 is a protrusion. Figure 4 is Figure 3 FIG. 3 is a side view of the main parts of the F section seen from G.

[0011] Next, the configuration of the pin fixing device 20' according to claim 2 of the present invention will be described with reference to FIGS. 3 and 4. Bell. In the pin fixing device 20', in the pin fixing device 20 according to claim 1, an elastic When fitting the ring 18, which has a In order to prevent one end of the hung ring 18 from coming off, connect the concave groove 14' of the fixing boss 21 and the outer end. A protrusion 23 was fixed at a position between the parts. Note that the protrusion 23 is fixed to the fixing boss 22. As a means of attaching, welding or using bolts, split pins, etc. Ru.

0012 Next, the operation of the pin fixing device 20' according to claim 2 of the present invention will be described. pin fixed In the device 20', when fitting the ring 18 to the fixing boss 21, first The inner diameter portion of one end of the end 18 is hooked into the groove 14' on the protrusion 23 side as shown in FIG. ring 18 extends over a part of the groove on the protrusion 23 side and the tapered portion 22 on the opposite side. It will be facing diagonally. Then, insert a screwdriver tool or similar tool into the ring 18 in the direction of arrow C. It is used to fit into the groove 14'. Since the protrusion 23 is provided, during the above operation, , first, one end of the ring 18 hooked on a part of the groove 14' on the protrusion 23 side comes off. This will be prevented. In this pin fixing device 20', a ring with relatively large elastic force is used. The effect is especially great when using .

[0013]

[Effect of the idea]

As explained above, in this invention, the fixing boss protruding from the outside of the bracket has a recess. The boss shape on the outside of the groove is tapered outward, and the fixing boss The outer diameter of the outer end surface of the ring was set to be smaller than the inner diameter of the ring. Also, bullets When fitting a ring that has a To prevent the end from coming off, a protrusion is fixed between the concave groove of the fixing boss and the outer end. . As a result, the outer diameter of the outer end of the fixing boss is smaller than the inner diameter of the ring. This allows you to quickly determine the starting position for inserting the ring. Then attach the ring to the fixing boss. When inserted in the axial direction from the outside to the inside, the ring will slide along the tapered part. Since the inner diameter is enlarged, the ring can be easily fitted into the groove. In this case, relatively elastic This effect is particularly great for fixing devices that use rings with low force. Also for fixing When using a pin fixing device with a protrusion fixed to the boss, the first step is to insert the ring. One end of the ring hooked on a part of the groove on the protrusion side is prevented from coming off. this Pin fixing devices are especially effective when using rings with relatively high elasticity. The fruit is big. Therefore, the pin joint part equipped with the pin fixing device of the present invention has elasticity. The operation of fitting the ring into the concave groove of the ring fixing boss can be done easily and in a short time. This also improves safety during the fitting operation.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a pin fixing device according to claim 1 of the present invention.

FIG. 2 is a plan view when the ring starts to be fitted, as seen from E in FIG. 1;

FIG. 3 is a plan view of the pin fixing device according to claim 2 of the present invention when the ring starts to be fitted.

4 is a side view of a main part of section F in FIG. 3 viewed from G; FIG.

FIG. 5 is a side view of essential parts of the work attachment for a hydraulic excavator.

FIG. 6 is a sectional view taken along line A-A in FIG. 5;

FIG. 7 is a detailed view of part B in FIG. 6;

8 is a sectional view taken along line CC in FIG. 7. FIG.

9 is a partially cutaway plan view seen from D in FIG. 7; FIG.

[Explanation of symbols]

1 Work attachment 7,8 pin 9 Boss 11,11’ bracket 12, 20, 20’ pin fixing device 13, 21 Fixing boss 14,14' Groove 17 Lock pin 18 ring 22 Tapered portion 23 Protrusion

Claims (2)

[Scope of utility model registration request] Claim 1: A boss is rotatably connected to the bracket via a pin, a fixing boss into which one end of the pin can be fitted is provided protruding from the outside of the bracket, and a fixing boss is provided around the entire circumference of the fixing boss. providing a concave groove spanning the length, and drilling a through hole passing through the concave groove in the diametrical direction in the fixing boss and pin,
In a pin joint part of a work attachment for construction machinery, in which a lock pin is inserted into the through hole, and an elastic ring is fitted into the groove so that both ends of the lock pin are held by the ring. , the shape of the boss on the outside of the concave groove of the fixing boss is tapered outward, and the outer diameter of the outer end surface of the fixing boss is set to be smaller than the inner diameter of the ring. A pin fixing device characterized by: [Claim 2] Utility model registration claims: In the pin fixing device according to claim 1, when the elastic ring is fitted into the groove, one end of the ring that is initially hooked on a part of the groove does not come off. A pin fixing device characterized in that a protrusion is fixed at a position between the concave groove and the outer end of the fixing boss.