JPH0564525U - Pin joint - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a pin joint that can easily remove a pin. [Structure] Among the members to be joined, a collar 25 into which the tip of the pin 24 can be inserted is fixed to the side surface of the outermost member 23, and the pin 24 is inserted into the collar 25 through the pin hole. A part of the collar 25 is removed at a position slightly apart from the surface of the outermost member 23, and two grooves 24A and 25A reaching two places on the same circumferential surface of the pin 24 are approximately parallel to each other in a chamfered shape. U-shaped snap pin 26 made of elastic rod in these two grooves.
A pin joint in which the outermost member 23 is provided with a stopper 28 having a height such that the snap pin 26 comes into contact with the arc portion at a position where the snap pin 26 does not come out.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pin joint that is detachably fitted into a joint portion of a plurality of members widely used in mechanical devices such as industrial machines.

[0002]

[Prior Art]

 The pin joint is, for example, as shown in FIGS. 5A and 5B, a bracket 4 on the movable member side between two brackets 2 and 3 (members to be joined) that are erected in a structure 1 such as a machine body of an industrial machine. (Members to be joined) are inserted, the pins 5 are inserted into the pin holes opened through these members, and the pin 5 is inserted from the collar 7 fixed to the side surface of the bracket 3 opposite to the head of the pin 5. The tip of the is protruded, the fixing bolt 6 is inserted into the hole provided so as to be orthogonal to the pin 5, and this is fixed with the lock nut 8.

Further, in the pin joints shown in FIGS. 6A and 6B, the bracket 10 on the movable member side is inserted between the two brackets 9 and 11 which are erected in the structure 1, and these members are penetrated. A slit groove that penetrates the pin 12 through a pin hole that is opened through the pin 12 and cuts into the peripheral surface of the pin 12 so as to leave a slight gap on the side of the bracket 11 on the side opposite to the head of the pin 12. A part of the central portion of the plate 13 is fitted into the 12A, and fixing bolts 14 are inserted into both ends of the plate 13 and screwed and fixed to the bracket 13.

[0004]

[Problems to be solved by the device]

 In the prior art of the two pin joints described above, the load between the pins 5 and 12 is large and the pin holes between the pins 5 and 12 and the bracket into which the pins 5 and 12 are inserted are attached, as in the case where vibration is involved. It is suitable for pin joints where there is little clearance and there is no backlash, and where relatively tight fitting is required.

However, since the pin joints of these structures require operations such as tightening of the lock nut and screwing of the stop bolt, for example, the pin and the pin hole are loosely fitted, and young rattling is acceptable. However, it can be inserted by hitting the pin with a hand or a light hammer, and it is not a very advantageous structure for a pin joint used at a place where the pin is often attached and detached. An object of the present invention is to provide a pin joint that can be easily attached and detached by eliminating the drawbacks of the conventional pin joints that require complicated operations for attachment and detachment.

[0006]

[Means for Solving the Problems]

 To achieve the above object, a pin joint according to the present invention is a pin joint that inserts a pin into a pin hole provided through a plurality of members to be joined to join the members together. , A position where the tip of the pin can be inserted to the side surface of the outermost member is fixed, and the pin is inserted into the collar through the pin hole. Part of the collar is deleted, and two grooves reaching two places on the same circumferential surface of the pin are formed in parallel with each other in two chamfers, and these two grooves form a U-shaped elastic rod. It is configured by fitting a parallel part of the snap pin and providing a stopper on the outermost member with a height that makes contact with the circular arc part at a position where the snap pin does not come out.

[0007]

[Work]

 Therefore, since the snap pin can be removed from the groove provided in this pin simply by rotating the pin, the other bracket supported by one bracket can be removed by pulling out the pin in this state. .. Also, when the pin is pulled out, the snap pin tries to come off from the groove provided in the pin, but the stopper prevents this, so that the pin can be prevented from being accidentally dropped.

[0008]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. 1 is a front view of the pin joint, FIG. 2 is a sectional view taken along the line AA in FIG. 1, FIG. 3 is a sectional view taken along the line BB in FIG. 1, and FIG. FIG. Two brackets 21 and 23 (members to be connected) are erected in parallel in a structure 1 such as an industrial machine, and a bracket 22 (members to be connected) on the movable member side is interposed between these brackets. A pin 24 having a handle 29 on its head is inserted into a pin hole opened through the pin, and is fixed to the side surface of the bracket 23 on the tip end side of this pin. Is inserted, and the parallel portion of the U-shaped snap pin 26 is fitted into the groove 25A arranged on both surfaces of the pin 25 through the collar 25.

A handle 29 formed by bending a round bar, for example, is attached to the head side so that the pin 24 can be held by hand and pulled out in a pin hole provided in the bracket. A groove 24A is formed at the position (distance L) slightly protruding from the bracket 23 at the tip of the pin 24 so that the same circumferential surface of the pin 24 is deleted in parallel to be chamfered. The collar 25 fitted to the tip of the pin 24 is also provided with a groove 25A at a position aligned with the groove 24A. The snap pin 26 is formed into a U shape as shown in FIG. 3 by using, for example, a round bar-shaped spring material, and the parallel portion of the snap pin 26 is fitted into both the grooves 24A and 25A at the same time. It is supposed to do.

When the snap pin 26 on the side surface of the bracket 23 located on the side opposite to the head side of the pin 24 is pulled out, the position where the arc portion of the snap pin 26 abuts is higher than the position of the snap pin 26. A collar 28 (stop) is fixed with a bolt 27, and the collar 28 prevents the snap pin 26 from slipping out. When assembling the pin joint according to the present invention, the bracket 22 is inserted between the two brackets 21 and 23 fixed to the structure 1, and the pin 29 is held by the pin 29 with the pin holes aligned. 24 is inserted, and the tip end portion is aligned with the groove 25A provided in the collar 25 in the collar 25 fixed to the side surface of the bracket 23 and the groove 24A provided in the pin 24. Next, insert the parallel part of the snap pin 26 into the two matching grooves 25A, 24A, and in the vicinity of the circular arc part of this U-shaped snap pin 26, make a length higher than the position of this snap pin 26. The collar 28 is fixed to the side surface of the bracket 23 with the bolt 27. This state is shown in FIGS.

Next, when pulling out the pin 24 to remove the bracket 22 from the brackets 21 and 23, as shown in FIG. 4, when the handle 29 provided on the pin 24 is twisted by 90 °, the snap pin The pin 26 rides up on the arcuate peripheral surface of the pin 24 and opens, and the snap pin 26 is supported in the groove 25A of the collar 25, but comes off the groove 24A of the pin 24. In this state, by pulling the pin 24 outward of the bracket 21, the bracket 22 can be removed from the structure 1.

It should be noted that the snap pin 26 is fitted in a predetermined position as shown in FIG. 2, or the pin 24 is rotated 90 ° as shown in FIG. The collar 28 fixed to the bracket 23 comes into contact with the circular arc portion of the snap pin 26 to prevent the snap pin 26 from slipping out even if the slippery state has slipped.

[0013]

[Effect of the device]

 As described above, the pin joint according to the present invention is a pin joint in which a pin is inserted into a pin hole formed through a plurality of members to be joined to join these members. Fix a collar into which the tip of the pin can be inserted on the side of the member, and insert the pin into the collar through the pin hole, and place the collar at a position slightly apart from the surface of the outermost member. By removing a part, two grooves extending to two places on the same circumferential surface of the pin are formed in parallel in two chamfers, and the U-shaped snap pin made of an elastic thin rod is formed in these two grooves. The outermost member is provided with a stopper having a height such that the parallel portion is fitted and the snap pin comes into contact with the arc portion at a position where the snap pin does not come out.

Therefore, since the snap pin can be removed from the groove provided in this pin only by rotating the pin, by pulling out the pin in this state, the other bracket supported by one bracket is removed. be able to. Also, when the pin is pulled out, the snap pin tries to come off from the groove provided in the pin, but the stopper prevents this, so that the pin can be prevented from being accidentally dropped.

[Brief description of drawings]

FIG. 1 is a front view of a pin joint according to an embodiment of the present invention.

FIG. 2 is a view on arrow AA of FIG.

FIG. 3 is a view taken along the line BB of FIG.

FIG. 4 is a view similar to FIG. 2 showing a state in which a pin is pulled out.

FIG. 5 is a side sectional view of a conventional pin joint, and FIG.
FIG. 4B is a right side view of FIG.

FIG. 6 is a side sectional view of a conventional pin joint, and FIG.
FIG. 4B is a right side view of FIG.

[Explanation of symbols]

1 structure 21,22,23 bracket 24
Pin 24A groove 25 collar 25A groove 26 snap pin 27 bolt 28 collar.

Claims (1)

[Scope of utility model registration request] 1. A pin joint for inserting a pin into a pin hole provided through a plurality of members to be joined so as to join these members together. Fix the collar into which the tip can be inserted, and with the pin inserted into the collar through the pin hole, remove a part of the collar at a position slightly apart from the surface of the outermost member, Two grooves extending to two places on the same circumferential surface are formed in parallel in a two-chamfered shape, and the parallel parts of the U-shaped snap pin made of an elastic thin rod are fitted into these two grooves, and
A pin joint in which a stopper having a height that contacts the circular arc portion at a position where the snap pin does not come out is provided on the outermost member.