JPS5835853Y2 - lift rod - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement of liftrond.

Conventionally, lift rods for work suspension of tractors have been susceptible to adverse effects such as threaded portions becoming rusty due to rainwater or muddy water, or threads being crushed by external objects.

Therefore, there are devices in which the threaded portion is covered with a protective cover to protect it from muddy water, external objects, etc.

However, liftronds with such protective covers have a special structure in which power is transmitted via a bevel gear between the adjustment handle shaft and the screw shaft.
The assembly structure is extremely complex.

Therefore, the present invention has improved the above-mentioned problems of the conventional product, and has a simple structure that protects it from muddy water, dirt, etc., and also allows for easy length adjustment. One end of the screw shaft is supported by a pivot bearing so as to be relatively rotatable, and the other end is screwed into a tie rod so that it can move forward and backward, and the pivot of the mantle tube covers the threaded part of the screw shaft that protrudes from the end of the tie rod. In a liftrond whose bearing side end is fixed to a screw shaft, an adjustment handle is provided on the outer surface of the pivot bearing side end of the mantle tube in an outwardly projecting manner, and a spring receiver is provided on the pivot bearing to improve elasticity. The opposing mounting portion is eccentrically inserted and supported by the spring receiver so that the rotation spring formed by bending the wire rod is elastically pushed toward the mantle tube, and the adjustment handle can be freely engaged and detached. The main feature is that a substantially U-shaped handle engaging/disengaging portion is provided for holding the handle.

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

The illustrated example shows a lift rod for suspending the work equipment of a tractor. In the drawing, reference numeral 1 indicates a tie rod, which is made of a cylindrical body and has a female thread 2 formed at one slightly narrowed end, and a two-pronged tie rod at the other end. The shaped joint 3 is integrally connected by welding or the like.

A midway portion of a lower link for suspending a working machine of a tractor (not shown) is pivotally connected to the joint 3.

A pair of holes 4, 4, which also serve as a grease inlet for injecting grease into the inside of this rod 1 and a retaining pin insertion hole to be described later, are provided on the circumference of the end of the tie rod 1 on the female thread 2 side. It is opened in the opposite direction.

Reference numeral 5 denotes a threaded shaft, which has a threaded portion 6 that is screwed into the female thread 2 of the tie rod 1, and has a collar 7 integrally formed on the shaft end thereof.

This threaded shaft 5 is coupled to the tie rod 1 on the same axis and in a manner that prevents it from coming off by screwing the shaft end opposite to the collar 7 into the female thread 2 of the tie rod 1.

This retaining means is achieved by inserting a retaining dowel 9, which is slightly longer than the inner diameter of the female thread 2, into a pin hole 8 which is opened at one end of the threaded portion 6 of the screw shaft 5 in a direction perpendicular to the axis.

To insert this retaining dowel 9, attach the screw shaft 5 to the tie rod 1.
When screwing them together as described above, align the hole 4 on the rod 1 with the pin hole 8 on the screw shaft 5, and press-fit the locking dowel 9 into the pin hole 8 from the hole 4. Bye.

Reference numeral 10 denotes a pivot bearing, which has a recess 12 with an internal diameter slightly larger than the diameter of the collar 7 of the screw shaft 5 and a female thread 11, and a joint 13 on the end face opposite to the four parts 12. It is integrally joined by welding etc.

A lift arm of a tractor (not shown) is pivotally connected to the joint 13.

The flange 7 of the screw shaft 5 is inserted into the recess 12 of the pivot bearing 10, and the washer holder 15 with the flange 14 inserted through the screw pongee 5 is screwed into the shaft end of the screw shaft 5. is rotatably and securely coupled within the recess 12 of the pivot bearing 10.

At this time, thrust washers 16 and 17 made of sintered alloy or the like are interposed between the flange 7 of the screw shaft 5 and the inner bottom surface of the recess of the pivot bearing 10, and between the flange I and the washer retainer 15, respectively. Ru.

Further, by interposing and fixing the rotation washer 18 between the collar 14 of the washer holder 15 and the open end surface of the pivot bearing 10, the threaded fit of the washer holder 15 is prevented from loosening.

Incidentally, the inner bottom surface of the recess 12 of the pivot bearing 10 and the end surface of the collar 7 of the screw shaft 5 facing thereto are formed with recesses 19 and 20, respectively, in which grease can be sufficiently stored.

Reference numeral 21 denotes a jacket tube, which is constructed of a cylindrical body with an inner diameter larger than the outer diameter of the tie rod 1, and has a base 22 integrally connected to one end thereof by welding or the like.

The base 22 of the mantle tube 21 is inserted through the threaded shaft 5 and fixed between the threaded portion 6 on the shaft 5 and the pivot bearing 10.

This fixing means is achieved by a fastening pin 23 such as a roll pin inserted orthogonally to the screw shaft 5 and the cap 22.

The length of the mantle tube 21 with one end fixed at a fixed position on the screw shaft 5 is such that even when the screw shaft 5 is extended beyond the tie rod 1 to the maximum, the female thread of the tie rod 1 on the screw shaft 5 The length is set to be sufficient to completely cover all of the threaded portions 6 exposed from the threaded portion 2.

A pair of adjustment handles 24, 24 are fixed to the outer periphery of the end of the housing tube 21 on the base side so as to protrude outward.

Reference numeral 25 denotes a rotation spring, which is constructed by bending a piece of elastic wire, such as a steel wire, so that its planar shape is approximately M-shaped, and the base thereof has opposing mounting portions 26 and 26'.
The head part is provided with a U-shaped handle engaging/disengaging portion 27 that can surround approximately half of the circumference of the handle 24.

The locking spring 25 is mounted on the pivot bearing by fitting the opposed mounting parts 26 and 26' into shaft holes 29 and 29' which are eccentrically provided on both left and right sides of the spring receiver 28 fixed on the pivot bearing 10. 10 so that it can be raised and lowered freely, and the head part 27 is attached to the mounting part 2.
6.26' is biased toward the mantle tube 21 side by the spring force in the direction A in the figure generated by the eccentric support of the handle 26, and the handle 24 is configured to engage with the handle 24 in a detachable manner. has been done.

When the configuration according to the above embodiment is clicked, the locking spring 25 is adjusted by standing up in the direction opposite to the direction A in the figure with the mounting portion 26, 26' as the center...The engagement with the handle 24 is released, and then the adjustment handle By holding the handle 24 in your hand and rotating it around the screw axis, the mantle tube 21 which is integrated with the handle 24 can be opened.
Also, the screw shaft 5 can be rotated, and the axial lengths of the screw shaft 5 and the tie rod 1 can be variably adjusted to be long or short.

Due to this adjustment, the threaded portion 6 on the screw shaft 5 is exposed from the female thread 2 of the tie rod 1, but the exposed portion of the threaded portion 6 is covered by the mantle tube 21.

After adjustment, when the rotation spring 25 is tilted in the direction A in the figure and its locking/disengaging portion 27 is engaged with the adjustment handle 24, the screw shaft 5
It is possible to take measures to stop the occurrence of

The present invention has the above structure, and the screw shaft 5 and the mantle tube 21 are integrally connected, and the screw shaft 5 is directly rotated by the adjustment handle 24 attached to the mantle tube 21. , there is no need for a transmission gear such as a bevel gear like in a conventional covered turnbuckle between the handle 24 and the screw shaft 5, which simplifies the structure and makes it easy to assemble. In addition, the threaded part 6 exposed from the female thread 2 of the tie rod 1 on the threaded shaft 5 is always covered by the mantle pipe 21, so it can be completely protected from rainwater, muddy water, dirt, and foreign objects, and rust on the threaded part 6. It can prevent sticking, crushing, etc.

Generally speaking, in the present invention, the rotation spring 25 on the pivot bearing 10 is engaged and disengaged using the adjusting handle 24 which is integrally constructed with the screw shaft 5, so that the rotation spring 25 on the pivot bearing 10 is connected to and removed from the handle 24 using the adjustment handle 24, which is integrally constructed with the screw shaft 5.
5 can be engaged and disengaged with a single touch, making it easy to adjust the length.

In addition, when the rotation spring 25 is in the corrected state where the handle 24 holds the handle 24, the spring force generated by the eccentric support of the rotation spring 25 causes the handle 27 to engage and disengage.
This prevents the handle from separating from the handle 24, and there is no risk of it coming off inadvertently.

Furthermore, since the handle 24 is configured to clamp the handle engaging/disengaging portion 27, there is no wobbling, and the distance between the handle 24 and the rotation spring 25 is constant, so a stable clamping state can always be obtained.

Moreover, since the flange 1 of the screw shaft 5 is supported on the inner bottom surface of the pivot bearing 10 via the thrust washer 16, it will not heat up and seize even when the thrust load is large, and it will also be wear resistant. It has the effect of being superior in quality.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the turnbuckle of the present invention, and FIG. 2 is a plan view. 1...Tie rod ″X5...Screw shaft,
7-...-m, 10... Pivot bearing, 16...
...Thrust washer, 6...Threaded part, 21
...... Mantle tube, 24... Adjustment handle,
25...Return spring.

Claims (1)

[Scope of utility model registration request] One end of the screw shaft 5 is supported by a pivot bearing 10 so as to be relatively rotatable, and the other end is screwed into a tie rod 11 so as to be able to move forward and backward, and a threaded portion 6 of the screw shaft 5 projects from the end of the tie rod 1.
In the lift rond in which the pivot bearing 10 side end of the mantle tube 21 covering the mantle tube 21 is fixed to the screw shaft 5, the mantle tube 2
Adjustment on the outer surface of the pivot bearing 10 side end of No. 1...endle 24
is provided in an outwardly protruding shape, a spring receiver 28 is provided on the pivot bearing 10, and the reversing spring 25, which is formed by bending an elastic wire, springs toward the mantle tube 21 side. The mounting portions 26 and 26' are eccentrically inserted into and supported by the spring receiver 28, and a substantially U-shaped handle engaging/disengaging portion 27 for detachably holding the adjustment handle 24 is provided. Features Lift Rondo.