JP2020175760A - Height adjustment mechanism of trailer support device - Google Patents

Abstract

To provide a height adjustment mechanism capable of changing the height of a trailer support device which supports a heavy weight article by a manual operation of a handle.SOLUTION: A load support device having a height adjustment function which utilizes a worm gear mechanism includes a worm 19, a worm wheel 9, a jack shaft 10 of which the cross-section perpendicular to a shaft is a tetragon, a sliding bearing 12 of which the cross-section perpendicular to the shaft is a tetragon, a trapezoidal thread 4 connected with the jack shaft 10 and a screw nut 18 screwed with the trapezoidal thread 4, the worm wheel 9 is connected with the sliding bearing 12, a cross-section of a contact portion of the jack shaft 10 and the sliding bearing 12 is comprised of the sliding bearing mechanism as the fitting of the tetragon to each other and the trapezoidal thread 4 rises and falls by rotating the worm 19 with a manually operable handle 3.SELECTED DRAWING: Figure 1

Description

The present invention relates to a trailer support device capable of supporting the front end side of a trailer towed vehicle.

A vehicle in which a tractor as a towing vehicle and a trailer as a towed vehicle are connected has a trailer in which the front end side of the trailer is connected to a coupler on the rear end side of the tractor. Since such a trailer is towed by a tractor and travels, a drive wheel is not provided on the front end side of the trailer, and traveling wheels are arranged on the rear end side of the trailer.

Generally, a trailer, which is a towed vehicle, is provided with support legs that support the front end side of the trailer by touching the ground when being separated from the tractor. The support legs are raised and lowered by various methods such as hydraulic pressure, pneumatic pressure, motor drive, and manual operation.

The trailer auxiliary leg described in Patent Document 1 is disclosed in which the upper inner cylinder can be expanded and contracted up and down by rotating the first shaft via the bevel gear mechanism by operating an external handle.

The trailer support device described in Patent Document 2 is disclosed in which the height can be adjusted by a feed screw mechanism having a feed screw under the support leg.

Japanese Patent Application Laid-Open No. 10-147217 Japanese Patent No. 6289722

Provided is a height adjusting mechanism capable of changing the height of a trailer support device that supports a heavy object by manually operating a handle.

It is a load support device with a height adjustment function using a worm gear mechanism, and has a worm, a worm wheel, a jackie shaft with a square cross section perpendicular to the axis, and a square cross section with an inner circumference perpendicular to the axis. It has a sliding bearing, a trapezoidal screw connected to a jackie shaft, and a screw nut screwed with the trapezoidal screw, the worm wheel is connected to the sliding bearing, and the cross section of the contact point between the jackie shaft and the sliding bearing It is a load support device that consists of a sliding bearing mechanism that fits in a square shape to each other, and features a trapezoidal screw that moves up and down by rotating the worm with a manually operable handle.

It is a trailer support device capable of supporting the front end side of a trailer to be towed, and is a trailer support device including the load support device described above. Further, the container for a vehicle that can stand on its own may be a container support device for a vehicle characterized by being provided with the load support device described above.

Since the telescopic trapezoidal screw portion is housed inside the support leg, the structure can be simplified and the weight can be reduced, and stable load support can be obtained even with a trailer on which a heavy object is mounted.

It is a perspective view of the trailer support device of 1st Embodiment. It is a front view and the left side view of the trailer support device of 1st Embodiment. It is an internal structure diagram in a gearbox. It is operation explanatory drawing of the height adjustment mechanism of the load support device of this invention. It is explanatory drawing at the time of retracting and the time of standing of the trailer support device in the first embodiment. It is explanatory drawing at the time of the trailer support device and storage in 2nd Embodiment. It is a perspective view which attached the trailer support device in 3rd Embodiment to a vehicle container, and is the explanatory view at the time of storage.

The present invention will be described based on the embodiments shown in FIGS. 1 to 7.

FIG. 1 is a perspective view of the trailer support device 1 of the first embodiment. As shown in FIG. 1, the trailer support device 1 is configured by connecting a support leg 2, a handle 3, a trapezoidal screw 4, a swivel nut 6 which is a washer fitting nut, and a base plate 5 to the lower end of the trapezoidal screw 4. ing.

FIG. 2A is a front view of the trailer support device 1 of the first embodiment, and FIG. 2B is a left side view. The base plate 5 can be raised and lowered by manually rotating the handle 3.

FIG. 3A is an internal structural view of the gearbox 7 of FIG. 2B. FIG. 3B is a sectional view taken along line XX of FIG. 3A.

Inside the gearbox 7, there are a trapezoidal screw 4, a worm wheel 9, a square pillar-shaped jackie shaft 10, a slide bearing 12 that slides the jackie shaft 10, and a radial bearing 14 that supports a load acting in a direction perpendicular to the axis. It is composed of a thrust bearing 15 that supports a load acting in the axial direction, a screw nut 18, and a worm 19.

The worm 19 of the screw-shaped gear and the worm wheel 9 of the oblique gear are engaged with each other, and the rotation of the worm 19 sends the teeth of the worm wheel 9 to rotate the worm gear mechanism. The jackie shaft 10 and the trapezoidal screw 4 are connected by a pin 17, and the trapezoidal screw 4 is held by a screw nut 18 in a screw structure.

FIG. 4 is an operation explanatory view of the height adjusting mechanism of the load support device. FIG. 4 (A) shows the state of the base plate 6 when standing, and FIG. 4 (B) shows the state of the base plate 5 when it is raised and retracted.

As shown in FIG. 4B, when the handle 3 is manually rotated, the worm 19 is rotated.
The worm wheel 9 that meshes with the axis of the worm 19 at right angles rotates. Since the slide bearing 12 is in contact with the worm wheel 9, the slide bearing 12 also rotates as the worm wheel 9 rotates.

The jackie shaft 10 having a quadrangular cross section perpendicular to the shaft and the sliding bearing 12 having a quadrangular cross section on the inner circumference perpendicular to the shaft have a quadrangular cross section at the contact points of the sliding bearing mechanism. Is a feature. As the slide bearing 12 rotates, the jackie shaft 10 also rotates. The fitting part may be a polygon other than a quadrangle or a substantially circular shape, but a quadrangle that is easy to manufacture was adopted.

The trapezoidal screw 4 connected to the jacky shaft 10 by the pin 17 rotates in conjunction with the trapezoidal screw 4 as the worm wheel 9 rotates. The trapezoidal screw 4, which can transmit a large force in the axial direction with a relatively small moment, is screwed with the screw nut 18 to move up and down.

By adopting the slide bearing mechanism, when the trapezoidal screw 4 rotates, the jackie shaft 10 can be slidably raised and lowered in the axial direction. That is, the structure is such that the height of the base plate 5 can be adjusted by using the worm gear mechanism.

FIG. 5 is an explanatory view of the trailer support device 1 in the first embodiment when it is retracted and when it is erected. The mechanism for adjusting the height of the trailer support device 1 is composed of the load support device of the present invention.

FIG. 5A shows a state in which the four trapezoidal screws of the trailer support device 1 are housed inside the support legs 2. FIG. 5B shows a state in which the trailer is erected by the trailer support device 1.

FIG. 6 is an explanatory view of the trailer support device 1 and the retracted state in the second embodiment. The mechanism for adjusting the height of the trailer support device 1 is composed of the load support device of the present invention.

In FIG. 6A, the trailer support device 1 of the first embodiment is connected to the rotating shaft 30, and the rotating shaft 30 pivotally supported by the rotating bearing 31 is manually slid in the axial direction of the rotating shaft 30. After sliding, it slides in the circumferential direction, rotates 90 degrees, and stands.

Between the two rotating bearings 31, a rotation stopper 33 and a cylindrical center clutch 32 are arranged in the axial direction of the rotating shaft 30. It has a fitting clutch function including a member formed of a plurality of uneven portions capable of engaging and separating both end surfaces of the center clutch 32 and the rotation stopper 33 from each other. The rotating shaft 30 is a cylindrical steel material, and is pivotally supported by a rotating bearing 31.

The outer peripheral surface of the rotating shaft 30 slides axially along the inner peripheral surface of the bearing 31 and is slidable, and the outer peripheral surface of the rotating shaft 30 is circular along the inner peripheral surface of the rotating bearing 31. It slides in the circumferential direction and can rotate. The rotary bearing 31 that pivotally supports the rotary shaft 30 is a slide bearing that is slidably supported.

FIG. 6B shows a state in which the trailer support device 1 is stored in the lower part of the trailer.

FIG. 7 is a perspective view and an explanatory view at the time of storage in which the trailer support device according to the third embodiment is attached to a vehicle container as a container support device. FIG. 7 (A) shows a state in which four container support devices are attached to the lower part of the vehicle container, the container is lowered from the truck, and the container is allowed to stand on the ground. FIG. 7 (B) shows the container. It shows a state in which the container support device is stored in the lower part of the truck after being loaded on the truck.

1 Trailer support device 2 Support leg 3 Handle 4 Trapezoidal screw 5 Base plate 6 Swivel nut 7 Gearbox 8 Support leg mounting plate 9 Warm wheel 10 Jackie shaft 11 Cover plate 12 Slide bearing 13 C type retaining ring 14 Radial bearing 15 Thrust bearing 16 Bearing Housing 17 Pin 18 Screw nut 19 Worm 20 Gear shaft 21 Bearing metal 30 Rotating shaft 31 Rotating bearing 32 Center clutch 33 Retaining ring

Claims (3)

It is a load support device with a height adjustment function using a worm gear mechanism, and has a worm, a worm wheel, a jackie shaft with a square cross section perpendicular to the axis, and a square cross section with an inner circumference perpendicular to the axis. It has a sliding bearing, a trapezoidal screw connected to the jackie shaft, and a screw nut screwed with the trapezoidal screw, and the worm wheel is connected to the sliding bearing, and the jackie shaft and the sliding bearing A load support device comprising a sliding bearing mechanism in which the cross sections of contact points are fitted to each other in a quadrangular shape, and the trapezoidal screw is raised and lowered by rotating the worm with a manually operable handle. A trailer support device capable of supporting the front end side of a trailer to be towed, wherein the trailer support device includes the load support device according to claim 1. A trailer support device that can support the front end side of the trailer, which is a towed vehicle, and has a cylindrical center clutch provided on a cylindrical rotating shaft, a rotating bearing, and a rotation stop provided on the end face of the bearing. It has a fitting clutch function provided with a member formed of a plurality of uneven portions capable of engaging and separating both end surfaces of the center clutch and the rotation stopper from each other, and supports the rotation shaft. The rotating bearing is a sliding bearing that is slidably supported, and the load supporting device according to claim 1 is connected to the rotating shaft so that the load supporting device can be manually slid and rotated. A trailer support device characterized by that.

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