JP3032326U - Link mechanism joint fittings - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To easily manufacture a highly accurate joint fitting without using a special jig, and to provide a joint fitting having an improved tensile strength as compared with a conventional fitting. SOLUTION: In a joint fitting formed by connecting a rod member 8 to an outer surface of a bent portion of a substantially U-shaped joint member 7, a hole 7c through which the rod member 8 can be inserted is formed in the bent portion of the joint member 7. On the other hand, an engaging portion 8a larger than the hole 7c of the joint member 7 is provided at the end of the rod member 8, and the rod member 8 is jointed with the engaging portion 8a being engaged with the inner surface of the bent portion. It was inseparably fixed to the outer surface of the bent portion of the member 7.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a joint fitting of a link mechanism used to interconnect two arms and the like.

[0002]

[Prior art]

 As shown in FIG. 5, a conventional joint fitting has a U-shaped joint member 7 formed by bending an elongated iron plate at a middle portion in the longitudinal direction, and a welding portion 12 on the outer surface of the bent portion of the joint member 7. And a rod member 8 in the shape of a round bar connected by. 7a and 7b are pin holes

[0003]

[Problems to be solved by the device]

 However, when manufacturing this joint fitting, the tip surface of the rod member 8 is applied to the outer surface of the bent portion of the joint member 7 and the peripheral portion is welded. At that time, the joint member is welded. In addition to the fact that the bent portion of 7 is curved, positioning of the rod member 8 is difficult, and a special jig is required to weld the rod member 8 at the designed position. The link mechanism, which requires operating force, had some problems such as insufficient welding strength and unsuitability.

[0004]

[Means for Solving the Problems]

 SUMMARY OF THE INVENTION The present invention is intended to solve such a problem, and in a joint fitting formed by connecting a rod member 8 to an outer surface of a bent portion of a substantially U-shaped joint member 7, the joint member A hole 7c into which the rod member 8 can be inserted is provided in the bent portion of the rod member 7, and a locking portion 8a larger than the hole 7c of the joint member 7 is provided in the end portion of the rod member 8. It is characterized in that the rod member 8 is inseparably fixed to the outer surface of the bent portion of the joint member 7 in a state where the rod member 8 is locked to the inner surface of the bent portion.

[0005]

[Embodiment of device]

 FIG. 1 is a side view of a link mechanism to which the present invention is applied, where 1 is a clutch housing of an agricultural tractor, 2 is a mission case fixed to a rear end of a clutch housing 1, and 3 is a lateral projection from a mission case 2. It is a brake device for braking an axle (not shown) that operates. Reference numeral 4 denotes a pedal for braking the brake device 3, and its base is fixed to an end of a rotary shaft 5 pivotally supported on the bottom of the clutch housing 1. A link mechanism 6 is provided between the operation arm 4a that swings around the rotary shaft 5 integrally with the pedal 4 and the operation arm 3a of the brake device 3 so that the brake device 3 operates by depressing the pedal 4. They are arranged and interconnected by pins 10. A return spring 11 acts on the pedal 4 and the brake device 3.

The link mechanism 6 is composed of two sets of joint fittings formed by connecting a rod-shaped rod member 8 to a U-shaped joint member 7 and a turnbuckle 9 that connects both rod members 8 to each other. . 2 is a side sectional view of the joint fitting, FIG. 3 is a front sectional view of the same, and FIG. 4 is an exploded perspective view of the joint member 7 and the rod member 8.

The joint member 7 is formed into a U-shape by bending an elongated iron plate into two at an intermediate portion in the longitudinal direction, and has a flat plate portion on which the pin for connecting to the operation arms 3a and 4a is formed. Holes 7a and 7b into which 10 is inserted are bored, and the bent portion thereof is bored with a hole 7c having an inner diameter substantially equal to the outer diameter of the rod member 8 and through which the rod member 8 can be inserted. To be done.

The rod member 8 is made of a round bar steel material, and a threaded portion for fastening to the turnbuckle 9 is engraved on the outer periphery of one end thereof, and the tip on the other side is A locking portion 8a larger than the inner diameter of the hole 7c of the joint member 7 is provided by partially deforming it into a flat shape by pressing or the like.

When the rod member 8 is connected to the joint member 7 to manufacture a joint fitting, the threaded portion of the rod member 8 is projected from the outer surface side of the bent portion as shown in FIG. , The rod member 8 is inserted through the hole 7c along the direction of the arrow, and with the locking portion 8a in contact with the inner surface of the bent portion of the joint member 7, the outer surface of the bent portion and the rod member By providing the welded portion 12 with the outer periphery of 8, the rod member 8 and the joint member 7 are inseparably fixed to each other, and the joint fitting is completed.

[0010]

[Effect of device]

 As described above, according to the present invention, the rod member 8 can be inserted into the bent portion of the joint member 7 in the joint fitting formed by connecting the rod member 8 to the outer surface of the bent portion of the substantially U-shaped joint member 7. While the hole 7c is provided, a locking portion 8a larger than the hole 7c of the joint member 7 is provided at the end of the rod member 8, and the locking portion 8a is locked to the inner surface of the bent portion. By fixing the member 8 to the outer surface of the bent portion of the joint member 7 inseparably, even if the bent portion of the joint member 7 is curved, the action of the hole 7C and the locking portion 8a causes a special jig. It is possible to quickly position the rod 8 at an appropriate welding position as designed without using, and it is possible to easily manufacture a highly accurate joint fitting.

Further, although the welding range is the same as that of the conventional one, since the locking portion 8a of the rod member 8 is locked on the inner surface of the bent portion of the joint member 7, the welding range is smaller than that of the conventional one. It has become possible to use this joint fitting for a link mechanism that requires a large amount of operating force due to increased tensile strength.

[Brief description of drawings]

FIG. 1 is a side view of a link mechanism to which the present invention is applied.

FIG. 2 is a side sectional view of a joint fitting.

FIG. 3 is a plan sectional view of the same.

FIG. 4 is an exploded perspective view of a joint member and a rod member.

FIG. 5 is a plan sectional view of a joint fitting showing a conventional example.

[Explanation of symbols]

 6 Link Mechanism 7 Joint Member 7C Hole 8 Rod Member 8a Locking Part 12 Welding Part

Claims (1)

[Scope of utility model registration request] 1. A joint metal fitting formed by connecting a rod member 8 to an outer surface of a bent portion of a substantially U-shaped joint member 7, wherein a hole 7c into which the rod member 8 can be inserted is inserted into the bent portion of the joint member 7. On the other hand, an engaging portion 8a larger than the hole 7c of the joint member 7 is provided at the end of the rod member 8, and the rod member 8 is engaged with the engaging portion 8a on the inner surface of the bent portion. Joint member 7
A joint fitting for a link mechanism, which is inseparably fixed to the outer surface of the bent portion of.