JP5797216B2 - Auxiliary leg drive for supporting the trailer - Google Patents

Description

  The present invention relates to a driving device (landing gear) for moving an auxiliary leg that touches down and supports the front side of a trailer in a vertical direction when the trailer is pulled by a tractor and is separated from the tractor. .

A trailer towed by a tractor is generally used for transporting large cargo that cannot be loaded on a truck bed or heavy cargo. A trailer (semi-trailer) is a vehicle that travels while supporting the front side of a vehicle body by a connected tractor, and has no wheels on the front side of the vehicle body. Therefore, the trailer is provided with auxiliary legs that come into contact with the trailer and support the front side of the trailer when separated from the tractor.
A typical example of such a trailer is a container chassis for loading containers for large transport containers (in the following description, a container chassis may be described in a form that represents a trailer). As shown in FIG. 9, the container chassis includes two main rails MR extending in parallel with the front-rear direction of the vehicle body. A wheel WL is provided at the rear of the container chassis, and a rear end of a tractor (not shown) The auxiliary leg LG is installed at a position on the front side that does not interfere. A king pin KP that is coupled to a connector (coupler) placed on the tractor chassis is secured to the front end of the main rail MR. The container chassis of FIG. 9 includes a dual-purpose container chassis that includes a slide frame SF that can be expanded and contracted at the rear part of the main rail MR and can load containers having different lengths of 20 feet (about 6 m) and 40 feet (about 12 m). It has become.

  Since the auxiliary leg LG needs to be pulled up when the container chassis travels, the container chassis is equipped with a driving device for moving the auxiliary leg LG in the vertical direction, and the auxiliary leg LG and the driving device are called landing gears. It is. The auxiliary leg drive device is described in, for example, Japanese Patent No. 2627038. In the drive device, as shown in FIG. 10, the outer cylinder OC is provided, and the auxiliary leg LG slides in the vertical direction inside the outer cylinder OC. It is configured as follows. A nut body NT having an internal thread is fixed above the auxiliary leg LG, and a bevel gear BG fixed to the upper part of the screw shaft TS fitted to the internal thread is rotatably attached to the outer cylinder OC. A drive rotary shaft DS is installed to rotate the bevel gear BG to raise and lower the nut body NT, and a handle HL that is manually operated is attached to this.

In order to raise and lower the auxiliary leg LG, the handle HL is manually rotated after linearly setting the rotation axis of the handle HL and the drive rotation axis DS (FIG. 10A). The drive rotation shaft DS can be set at two axial positions, the rotation transmission path from the handle HL to the bevel gear BG is switched according to the position, and the rotation speed of the bevel gear BG is low. Changed to high speed. That is, when the drive rotation shaft DS is pushed in by the handle HL and rotated (FIG. 10B), the drive rotation shaft DS is directly connected and power is transmitted as indicated by the arrow in the figure, and the bevel gear BG is at high speed. The auxiliary leg LG rotates to increase the lifting speed (high speed gear). On the other hand, when the rotation operation is performed at the position where the drive rotation shaft DS is retracted (FIG. 10 (c)), the bevel gear BG is driven via the reduction gear train RG as indicated by the arrow in the figure, so that the auxiliary leg The raising / lowering speed of LG becomes low (low-speed gear), and accordingly, the operation torque required for the handle HL is reduced.
In order to position the high-speed gear and the low-speed gear, the drive rotating shaft DS is provided with a detent mechanism DM. Further, the handle HL is not detached from the drive rotating shaft DS even when the auxiliary leg LG is not raised or lowered, and is stored by being hooked to a hook that is bent at the position of the connecting shaft CS and fixed to the outer cylinder OC. (See FIG. 3 described later). As a result, the rotation of the drive rotation shaft DS is blocked by the handle HL, and for example, a situation in which the auxiliary leg LG is gradually lowered by its own weight due to vibrations or the like while the container chassis is running is prevented.

By the way, the work of rotating the handle HL to raise and lower the auxiliary leg LG is a work that places a considerable burden on the operator. In particular, when the trailer is separated from the tractor while the cargo is still loaded on the loading platform (such separation is performed after the trailer is placed on the ferry by the tractor in maritime transportation by ferry, for example, the arrival of the ferry) Another tractor is connected at the port), and after the auxiliary leg LG is grounded, the auxiliary leg LG is further extended against the weight of the loaded cargo, and the front part of the trailer is raised to a height at which the kingpin can be removed from the coupler. Must. Even if this operation is performed using a low-speed gear, it is necessary to apply a large operating torque to the handle HL, which places a heavy burden on the operator.
In order to reduce the burden on the operator, it is conceivable to use some kind of power for raising and lowering the auxiliary leg. For example, Japanese Patent No. 3054759 discloses that an air motor is attached to a drive device for an auxiliary leg, and the auxiliary leg is moved up and down using the air pressure of a brake air tank provided in the container chassis. Further, in Japanese Patent No. 4115619, a second rotation shaft to which a rotary air tool such as an impact wrench can be connected is provided in addition to a drive rotation shaft coupled with a manually operated handle, and the auxiliary leg is moved up and down. A drive device is disclosed in which the bevel gear can be rotationally driven also from the second rotation shaft.

Japanese Patent No. 2627038 Japanese Patent No. 3054759 Japanese Patent No. 4115619

  When the drive device for raising and lowering the auxiliary legs of the container chassis is operated by power, it is desirable to use power that can be easily used and to operate by a mechanism as simple as possible. The drive device using air pressure described in Patent Document 1 or Patent Document 2 is suitable for a drive device that raises and lowers auxiliary legs because the air pressure of a brake tank air tank of a container chassis can be used.

However, as described in Patent Document 1, when the auxiliary leg is moved up and down by an air motor pre-assembled in the driving device, a mechanism for attaching the air motor and a power transmission mechanism from the air motor are required, and the driving device becomes complicated. To do. In addition, when the air motor is increased in size, it is possible to obtain a drive device with a large operating torque that can raise the front part of the trailer in a state where cargo such as a container is loaded, but recently, a drive device with a large torque is not required. The following circumstances have appeared.
A so-called air suspension that uses air springs instead of leaf springs has become widespread in truck suspension systems (suspensions) for freight transportation, in order to reduce vibration during travel and prevent damage to loaded cargo. The number of tractors that use air suspension is increasing. Vehicles that employ air suspensions can change the height of the chassis by increasing or decreasing the air pressure in the air spring, and the tractor using this can be used when connecting to or disconnecting from the container chassis. The height of the chassis can be reduced, and the coupler and kingpin can be coupled and separated. For example, when separating from the tractor with the cargo loaded on the trailer, it is only necessary to lower the tractor chassis after the auxiliary leg is grounded, and it is not necessary to raise the trailer using a low-speed gear.

The drive device described in Patent Document 2 is a drive device that can raise and lower the auxiliary leg by a rotating air tool, in addition to manual operation by a handle. The rotary air tool is a universal tool provided in various factories, transportation bases, and the like, and a drive device using the tool is very convenient. However, the drive device of Patent Document 2 is provided with a drive rotation shaft for manual operation by a handle and a second rotation shaft for a rotary air tool, and the structure of the drive device is also complicated. In addition, with the increase of air suspension tractors, there is a strong demand for remodeling the conventional drive unit so that it can be operated with a rotating air tool in order to speed up the connection and separation work with the trailer. It is not easy to remodel the drive device described above into a drive device as described in Patent Document 2.
The object of the present invention is that the drive device for manually raising and lowering the auxiliary leg of the trailer such as a container chassis can be operated with a rotary air tool with a simple structure, and it is easy to carry out by modifying the conventional drive device. There is to do.

In view of the above problems, the present invention provides a drive device that lifts and lowers an auxiliary leg of a trailer. A rotary air that can be connected to a drive rotary shaft while fitting a clutch between a manual handle and a drive rotary shaft. A tool attachment (adapter) is provided, and after the fitting clutch is separated, this attachment is connected so that the rotary air tool can be driven to rotate. That is, the present invention
“In the trailer towed by the tractor, the driving device for moving the auxiliary leg supporting the front side in the vertical direction,
A fitting clutch provided with two members engaged and separated from each other is provided at the end of the drive rotary shaft to which a handle for manually moving the auxiliary leg is attached,
One member of the mating clutch is attached to the drive rotary shaft, the other member is attached to the handle, and
An attachment that can be attached to a rotary air tool is provided, and the attachment is configured to be connectable to the drive rotary shaft so as to separate the fitting clutch and rotate the drive rotary shaft. ''
The drive device is characterized by this.

3. A sleeve according to claim 2, wherein one of the members of the fitting clutch is a pin fixed to the drive rotating shaft, and the other member has a groove engaging with the pin formed at an end thereof. The sleeve is fitted to the drive rotation shaft and slidably attached to the handle. When the fitting clutch is separated, the sleeve is slid to engage the groove and the pin. It is preferable that it is comprised so that may be cancelled | released.
In this case, as described in claim 3, a groove that engages with the pin is also formed in the attachment, and when the attachment is connected to the drive rotary shaft, the groove of the attachment and the pin are engaged. Can be combined. Further, according to a fourth aspect of the present invention, a square head is formed at the tip of the drive rotation shaft, and a recess corresponding to the square head is formed in the attachment, so that the attachment is driven to rotate. When connected to the shaft, the square head of the drive rotation shaft can be fitted into the recess of the attachment.

  According to a second aspect of the present invention, as in the fifth aspect, the sleeve is pressed by a spring in a direction in which the engagement clutch is engaged, and the attachment is connected to the drive rotation shaft. In this case, the end face of the attachment pushes the sleeve to slide the sleeve, and the fitting clutch can be separated. According to a sixth aspect of the present invention, a detent mechanism can be provided between the drive rotating shaft and the sleeve for positioning at a position where the engagement clutch is engaged and a position where it is separated.

  According to a seventh aspect of the present invention, as the fitting clutch, a clutch provided with two members formed with a plurality of concave and convex portions that fit together can be used.

  According to an eighth aspect of the present invention, the handle may be provided with a rod that comes into contact with the tip of the drive rotation shaft when the fitting clutch is engaged.

In the drive device of the present invention for raising and lowering the auxiliary leg of the trailer, a fitting clutch is provided at the end of the driving rotary shaft to which a manual handle is attached, and the handle is connected to the driving rotary shaft via the fitting clutch. Then, an attachment for a rotary air tool that can be connected to the drive rotary shaft is prepared, and this attachment can be connected to the drive rotary shaft after the engagement clutch is separated, so that the drive rotary shaft can also be rotationally driven by the rotary air tool. I am doing so.
As described above, the drive device of the present invention can rotate the drive rotary shaft that is normally manually rotated to raise and lower the auxiliary leg even with a rotary air tool. For example, in a state where cargo is loaded on a trailer. In the connection / disconnection work with the tractor, the burden on the operator is greatly reduced, and the time required for the work can be shortened. As described above, since a drive device having a large output is not required due to an increase in the number of air suspension tractors, a small and general-purpose tool such as an impact wrench can be used as the rotary air tool.

  The drive device of the present invention employs means for providing a fitting clutch between the drive rotary shaft and the handle, which is an external part of the drive device, when the auxiliary leg can be raised and lowered with the rotary air tool. It is an apparatus, Comprising: Internal parts other than a drive rotating shaft are not changed. Therefore, when remodeling the drive device already installed in the trailer and adding the drive function with the rotary air tool, it can be easily done by changing only the external parts such as the drive rotation shaft and handle, and it requires modification Cost is low.

In the invention of claim 2, the engagement clutch provided between the drive rotary shaft and the handle is constituted by a pin fixed to the drive rotary shaft and a sleeve having a groove engaging with the pin formed at the end thereof. The sleeve is attached to the handle and is slidably fitted to the drive rotation shaft . When the auxiliary leg is manually moved up and down by the handle, the handle is pushed in with the rotation axis of the handle aligned with the drive rotation axis, the groove of the sleeve is fitted into the pin, and the drive rotation axis is rotated. On the other hand, when moving up and down with a rotary air tool, the sleeve is slid to release the engagement between the groove and the pin, and then an attachment is connected to the drive rotary shaft, and the drive rotary shaft is driven to rotate with the rotary air tool.
In the mechanism according to claim 2, the configuration using the pin can form a simple engagement clutch, and the power of the handle or the rotary air tool is transmitted to the drive rotary shaft via the sleeve whose axis coincides with the drive rotary shaft. Therefore, stable power transmission can be performed.

The third and fourth aspects of the invention specify an attachment for a rotary air tool that is connected to the drive rotary shaft having the fitting clutch of the second aspect. In the invention of claim 3, a groove that engages with the pin of the drive rotating shaft is formed in the attachment, and after the engagement between the handle and the drive rotating shaft by the fitting clutch is released, the groove of the attachment is formed on the pin. Engage and rotate the drive rotary shaft with a rotating air tool. In this case, both the manual power of the handle and the power of the rotary air tool rotate the drive rotary shaft via the same pin, so that it is easy to design a fitting clutch and the like.
According to a fourth aspect of the present invention, a square head such as a nut is formed at the tip of the drive rotary shaft, and a concave portion that fits into the head is formed in the attachment for the rotary air tool. When the is separated, the drive rotation shaft is rotated through the rectangular head. The rotary air tool is generally used for fastening bolts and nuts, and since an attachment that can be connected to the nut is prepared as an accessory, when the structure of the invention of claim 4 is used, It is possible to use attachments as they are.

  According to a fifth aspect of the present invention, the sleeve which is a member of the fitting clutch according to the second aspect of the invention is pressed by a spring in a direction in which the fitting clutch is engaged. When rotating with the rotary air tool, the sleeve is pushed by the connected attachment to contract the spring, the fitting clutch is separated, and the attachment is engaged with the drive rotation shaft. In the invention of claim 5, the sleeve is always pressed by the spring in the direction in which the sleeve is fitted and the clutch is engaged. Therefore, after the engagement of the engagement clutch is released and the auxiliary leg is raised and lowered with the rotary air tool, the engagement clutch is automatically engaged, and the handle storing the reverse drive of the drive rotation shaft from the auxiliary leg is stored. Is blocked by. In other words, in order to prevent a situation in which the auxiliary leg LG is lowered by its own weight, the fitting clutch must be engaged before storing the handle, but even if you forget to engage, Such a situation does not occur.

  According to a sixth aspect of the present invention, in the drive device having the engagement clutch according to the second aspect of the present invention, the detent mechanism for positioning the engagement clutch between the engaged position and the separated position is provided between the drive rotating shaft and the sleeve. It is provided in between. According to this, the positioning of the sleeve of the engagement clutch can be performed reliably, and when the auxiliary rotary leg is moved up and down by rotating the driving rotary shaft with a rotary air tool, the rotating clutch is interposed between the rotating attachment and the non-rotating sleeve. A gap can be provided to eliminate friction between them.

  As in the seventh aspect of the present invention, when a clutch having two members formed with a plurality of concavo-convex portions that are fitted to each other, that is, a so-called meshing clutch is used as the fitting clutch, the power of the rotary air tool can be reduced even with a small clutch. Etc. can be reliably transmitted. In addition, as in the eighth aspect of the invention, when a rod that contacts the drive rotation shaft is installed at the tip of the manual handle, the rotation operation with the handle can be performed stably.

In the first embodiment of the auxiliary leg drive device of the present invention, it is a diagram generally showing a state of being driven by a handle. FIG. 2 is a detailed view of part A in FIG. 1. In the 1st Example of the drive device of the auxiliary leg of the present invention, it is a figure showing entirely the state driven with a rotation air tool. FIG. 4 is a detailed view of a portion B in FIG. 3. In the second embodiment of the auxiliary leg drive device of the present invention, FIG. In the second embodiment of the auxiliary leg drive device of the present invention, it is a detailed view showing a state driven by a rotary air tool. It is detail drawing in 3rd Example of the driving device of the auxiliary leg of this invention. It is detail drawing in 4th Example of the auxiliary leg drive device of this invention. It is a figure which shows the outline | summary of a container chassis. It is a figure which shows the drive device of the conventional auxiliary leg.

  Hereinafter, the drive device of the present invention that moves the auxiliary leg of the trailer in the vertical direction will be described with reference to the drawings. Here, the description will be given also using an embodiment in which the present invention is applied to a container chassis that is a representative example of a trailer. I decided to. The basic structure of the container chassis to which the present invention is applied is the same as that shown in FIG. 9, and the basic structure of the auxiliary leg driving device is the same as that shown in FIG. In the drawings showing the embodiment, corresponding parts and the like are denoted by the same reference numerals as those in FIGS.

  A first embodiment of the drive device of the present invention is shown in FIGS. FIG. 1 is a view of a state similar to that shown in FIG. 10A, in which a driving rotary shaft DS for raising and lowering the auxiliary leg LG is rotated by a manual handle HL, as viewed from the front front of the container chassis. The drive rotating shaft DS is extended across the two main rails MR so that the left and right auxiliary legs LG can be lifted and lowered simultaneously by operating one handle HL, and connects the left and right drive devices. A hook FK for securing the bent handle HL is fixed to the outer cylinder OC on which the auxiliary leg LG slides up and down.

A fitting clutch 1 is installed at a portion A in FIG. 1 which is a connecting portion between the drive rotating shaft DS and the handle HL, and an enlarged detailed view thereof is shown in FIG.
A pin 2 that penetrates the shaft is fixed to the end of the drive rotation shaft DS, and the pin 2 constitutes one member of the fitting clutch 1 that includes two members that are engaged and separated from each other. Further, the sleeve 3 is slidably fitted on the drive rotation shaft DS, and the sleeve 3 is formed with a U-shaped groove 31 (the lower figure in FIG. 2) that engages with the pin 2 at the end portion, so that the fitting clutch. 1 is the other member. The sleeve 3 is pressed in a direction to engage with the pin 2 by a coil spring 4 surrounding the drive rotation shaft DS.

  The front end of the handle HL for manual use is divided into two forks as in the handle of FIG. 10A, and a long hole HLh is formed therein. An outer sleeve 5 is fixed to the outside of the sleeve 3 by welding, and a bolt 6 is fastened to both the integrated sleeves. The bolt 6 is slidable in a long hole HLh of the handle HL. It is inserted. That is, the sleeve 3 which is the other member of the fitting clutch 1 is attached to the handle HL via the bolt 6.

  When the auxiliary leg LG is moved up and down by the handle HL, first, the rotation axis of the handle HL is linear with the drive rotation axis DS, and then the handle HL is pushed forward (leftward in FIG. 2). At this time, the sleeve 3 is pushed by the coil spring 4 and the U-shaped groove 31 remains engaged with the pin 2, but the bolt 6 slides on the handle rear side end of the long hole HLh, The handle HL is in a state of being stably fitted to the drive rotation shaft DS. When the handle HL is rotated in this state, manual power (operation torque) is sequentially transmitted from the handle to the bolt 6, the sleeve 3, the pin 2, and the drive rotation shaft DS, and the drive rotation shaft DS rotates to rotate the auxiliary leg LG. It will go up and down.

In the drive device of the present invention, an attachment (adapter) for a rotary air tool that can be connected to the drive rotary shaft DS is prepared so that the drive rotary shaft DS can also be rotationally driven by the rotary air tool. In the first embodiment of the present invention, FIG. 3 shows an overall view when the attachment is mounted and the drive rotary shaft DS is rotated by the rotary air tool. FIG. 3 shows the connection portion between the drive rotary shaft DS and the attachment. An enlarged detail view is shown in FIG.
As shown in FIG. 3, when the drive rotary shaft DS is rotated by the rotary air tool AT, the handle HL is first pulled and bent at the position of the bolt 6 to latch the outer cylinder OC on the hook FK. Next, the attachment 7 attached to the head portion of the rotary air tool AT is connected to the drive rotary shaft DS, and the attachment 7 is pushed forward (leftward in FIG. 3).

  As shown in the detailed view of FIG. 4, when the attachment 7 is connected to the drive rotation shaft DS, the front end surface of the attachment 7 comes into contact with the rear end surface of the sleeve 3, and when the attachment 7 is pushed forward, the sleeve 3 is coiled. Slide 4 while compressing. Therefore, the engagement between the U-shaped groove 31 and the pin 2 of the drive rotating shaft DS is released, and the fitting clutch 1 is separated. A U-shaped groove 71 is also provided at the tip of the attachment 7, and the pin 2 of the drive rotation shaft DS engages with the U-shaped groove 71 after the fitting clutch 1 is separated. As a result, the power of the rotary air tool AT is transmitted from the attachment 7 to the drive rotary shaft DS via the pin 2 and is rotated to raise and lower the auxiliary leg LG.

  When the attachment 7 and the rotary air tool AT are removed after the auxiliary leg LG has been lifted and lowered by the rotary air tool AT, the sleeve 3 is pushed by the coil spring 4 and slides to the right in the figure, and the groove of the sleeve 3 is removed. 31 and the pin 2 of the drive rotation shaft DS are engaged again, and the fitting clutch 1 between the drive rotation shaft DS and the handle HL is connected. Since the handle HL is in a state of being hooked on the hook FK shown in FIG. 3, reverse rotation of the drive rotation shaft DS from the auxiliary leg LG can be prevented by the handle HL.

  A second embodiment of the drive device of the present invention is shown in FIGS. The drive device of the second embodiment has a configuration similar to that of the first embodiment, and the main difference is that a hexagonal nut is fixed to the tip of the drive rotary shaft to attach to the rotary air tool attachment. The purpose is to form a recess into which the nut fits. FIGS. 5 and 6 showing the second embodiment correspond to FIGS. 2 and 4 of the first embodiment, respectively, and corresponding parts have the same reference numerals as those of the first embodiment. It is attached.

  As shown in FIG. 5, also in the drive device of the second embodiment, a fitting clutch 1A is installed at the connecting portion between the drive rotary shaft DS and the handle HL. As in the first embodiment, the fitting clutch 1A includes a pin 2 that penetrates the drive rotation shaft DS and constitutes one member of the engagement clutch 1A and is slidably fitted to the drive rotation shaft DS. The sleeve 3 in which a U-shaped groove 31 that engages with the pin 2 is formed at the end constitutes the other member. The sleeve 3 is pressed in the direction in which the sleeve 3 is engaged with the pin 2 by the coil spring 4 as in the first embodiment, but the outer sleeve 5A fixed to the outside of the sleeve 3 is a coil spring. 4 and the pin 2 are extended so as to cover the inner surface of the handle HL.

The front end of the manual handle HL is divided into two and has a flat plate shape, in which a long hole HLh is formed. A bolt 6 is fastened to the sleeve 3 and the outer sleeve 5, and the bolt 6 is slidably fitted into the long hole HLh of the handle HL.
When the auxiliary leg LG is lifted or lowered by the handle HL, the handle HL is pushed in after making the rotation axis of the handle HL linear with the drive rotation axis DS, as in the first embodiment. As a result, the handle HL is fitted into the drive rotary shaft DS while the pin 2 and the U-shaped groove 31 are engaged, and the manual power is fitted from the handle HL via the clutch 1A and the drive rotary shaft DS. , And the drive rotation shaft DS rotates to raise and lower the auxiliary leg LG.

  In the drive device of the second embodiment, a nut NT having a hexagonal cross section is fixed to the tip side of the pin 2 of the drive rotation shaft DS. And as shown in FIG. 6, the attachment 7A with which rotary air tool AT is mounted | worn has the recessed part by which nut NT is engage | inserted by the connection side with the drive rotating shaft DS.

When rotating the drive rotary shaft DS with the rotary air tool AT, the handle HL is bent at the position of the bolt 6 and stored in the hook, and then the front end face of the attachment 7A is fitted to the nut NT while the recess of the attachment 7A is fitted into the nut NT. It contacts 5A. Next, when the attachment 7A is pushed forward (to the left in FIG. 6), the attachment 7A moves the outer sleeve 5A against the spring 4, and the engagement between the groove 31 of the sleeve 3 and the pin 2 is engaged. The clutch 1A is separated. The power of the rotary air tool AT is transmitted from the attachment 7A via the hexagonal nut NT to the drive rotary shaft DS, which is rotated to raise and lower the auxiliary leg LG.
Usually, since an attachment for rotating the nut is attached to the air tool, it can be used as it is in the driving apparatus of the second embodiment. In addition, the cross section of a nut is not restricted to a hexagon, What is necessary is just to prevent the relative rotation of a drive rotating shaft and an attachment.

  FIG. 7 shows a third embodiment of the driving apparatus of the present invention. In the drive device of the third embodiment, the engagement clutch installed at the connecting portion between the drive rotary shaft and the handle is configured as a clutch having two members formed with a plurality of concavo-convex portions that fit together, a so-called engagement clutch. Has been. Further, the point that the nut for fitting the rotary air tool is fixed to the tip of the drive rotary shaft is the same as that of the second embodiment, but the outer sleeve is in contact with the end face of the handle. A guide rod or the like is fixed to the handle so that it can be extended and stably rotated when the handle is operated.

  As shown in FIG. 7, in the drive device of the third embodiment, the engagement clutch 1B between the drive rotation shaft DS and the handle HL is a clutch in which two members having a plurality of concave and convex portions formed in the circumferential direction mesh with each other. One member 2B is fixed to the drive rotary shaft DS, and the other member 3B is pushed by the spring 4 and slidably fitted into the drive rotary shaft DS, like the sleeve 3 in the first embodiment. Yes. A nut NT having a hexagonal cross section is fixed to the tip of the drive rotation shaft DS as in the second embodiment, but the outer sleeve 5B fastened to the other member 3B by the bolt 6 is the engagement clutch 1B. The diameter is larger than the outer sleeve 5A of the second embodiment so as to accommodate the member. A slit SL extending in the axial direction is formed in the outer sleeve 5B.

  In the drive device of the third embodiment, as shown in the upper diagram of FIG. 7, a rod RD having a boss portion BS is fixed to the bifurcated tip portion of the handle HL. When the drive rotation shaft DS is manually rotated by the handle HL, when the handle HL is pushed in after the rotation shaft of the handle HL is linear with the drive rotation shaft DS, the tip of the rod RD contacts the nut NT and at the same time The part BS is fitted into the outer sleeve 5B. Therefore, the rotation operation of the handle HL can be performed in a stable state, and the relative position between the drive rotation shaft DS and the outer sleeve 5B does not change, so that the fitting clutch 1B is reliably engaged and the manual power (operation Torque) is transmitted to the drive rotary shaft DS, and the auxiliary leg LG is moved up and down.

  When the drive rotary shaft DS is rotated by the rotary air tool AT, the handle HL is first bent at the position of the bolt 6 and stored in the hook. At this time, the rod RD of the handle HL passes through the slit SL of the outer sleeve 5B. As a result, there is no problem in the storing operation. As shown in the lower diagram of FIG. 7, the attachment 7B of the third embodiment is fitted into the nut NT and rotates the drive rotation shaft DS, as in the attachment of the second embodiment. However, in the third embodiment, the attachment 7B enters the inside of the outer sleeve 5B, and the engagement clutch 1B is separated by pressing the outer sleeve 5B with the end face of the rotary air tool AT.

  FIG. 8 shows a driving apparatus according to a fourth embodiment of the present invention. In the drive device of the fourth embodiment, a detent mechanism for positioning the other member of the fitting clutch attached to the handle is installed on the drive rotating shaft. In the fourth embodiment, the engagement clutch is separated manually when connected to the rotary air tool before the rotary air tool is connected. When the detent mechanism is installed, the pressing spring of the other member can be omitted as shown in FIG. 8, but the positioning detent mechanism is provided in the first to third embodiments having the pressing spring. It doesn't matter.

  The engagement clutch 1C of the fourth embodiment basically has the same configuration as the clutch of the first embodiment. As shown in the upper diagram of FIG. 8, the pin 2 fixed to the drive rotation shaft DS is provided. One member is a sleeve 3C in which a U-shaped groove is formed, and the other member is the other member (the upper diagram in FIG. 8 shows a state in which the handle HL is stored and the fitting clutch 1C is connected). In the fourth embodiment, the ball body BL urged outward by the spring CS is provided on the drive rotation shaft DS, and two recesses RS into which the ball body BL is fitted are provided in the axial direction of the sleeve 3C. These constitute a detent mechanism.

In the fourth embodiment, manual rotation of the drive rotation shaft DS by the handle HL is performed in a manner that the rotation shaft of the handle HL is linear with the drive rotation shaft DS, as in the first embodiment. At this time, the sleeve 3C is in the position shown in the upper diagram of FIG. 8, and the ball body BL is fitted into the concave portion RS on the left side of the drawing, and the fitting clutch 1C is connected.
When the drive rotary shaft DS is rotated by the rotary air tool AT, the position of the handle HL is manually moved a little to separate the fitting clutch 1C and simultaneously move the ball body BL to the right as shown in the lower diagram of FIG. Fit into the recess RS. Since the recess RS is a groove formed over the entire circumference of the inner surface of the sleeve 3C, the drive rotation shaft DS can rotate within the sleeve 3C in the state shown in the lower part of FIG. The attachment 7C connected to the rotary air tool AT is the same as that of the first embodiment, but since the fitting clutch 1C is separated in advance, it is not necessary to contact and press the sleeve 3C.

  As described above in detail, in the present invention, a drive device for raising and lowering the auxiliary leg of the trailer can be driven to rotate even with a rotary air tool, and a fitting clutch is interposed between the manual handle and the drive rotary shaft. In addition, an attachment for a rotary air tool that can be connected to the drive rotary shaft is provided, and this attachment can be connected after the fitting clutch is separated. In the above embodiment, the case where the present invention is mainly applied to a container chassis has been described, but it goes without saying that the present invention can be applied to a driving device for auxiliary legs of other trailers. Further, it is obvious that various modifications can be made to the above-described embodiment, for example, a spline type engagement clutch used in a so-called synchromesh type automobile transmission is adopted as the engagement clutch. is there.

1, 1A, 1B, 1C Fitting clutch 2 pin (one member of the fitting clutch)
3 Sleeve (the other member of the mating clutch)
4 Spring 5 Outer sleeve 7 Attachment (for rotating air tools)
LG Auxiliary Leg DS Drive Rotating Shaft HL Handle AT Rotating Air Tool

Claims (8)

In a trailer pulled by a tractor, a drive device for moving an auxiliary leg supporting the front side in the vertical direction,
A fitting clutch provided with two members engaged and separated from each other is provided at the end of the drive rotary shaft to which a handle for manually moving the auxiliary leg is attached,
One member of the mating clutch is attached to the drive rotary shaft, the other member is attached to the handle, and
An attachment attachable to the rotary air tool is provided, and the attachment is configured to be connectable to the drive rotary shaft so as to separate the fitting clutch and rotate the drive rotary shaft. Drive device. One member of the fitting clutch is a pin fixed to the drive rotation shaft, and the other member is a sleeve having a groove that engages with the pin formed at an end,
The sleeve is fitted to the drive rotation shaft and is slidably attached to the handle. When the fitting clutch is separated, the sleeve is slid to release the engagement between the groove and the pin. The drive device according to claim 1. The drive device according to claim 2, wherein a groove that engages with the pin is formed in the attachment, and the groove of the attachment engages with the pin when the attachment is connected to the drive rotation shaft. A square head is formed at the tip of the drive rotation shaft, and a recess corresponding to the square head is formed in the attachment, and when the attachment is connected to the drive rotation shaft, The driving device according to claim 2, wherein a square head portion of the drive rotation shaft is fitted into a concave portion of the attachment. The sleeve is pressed by a spring in a direction in which the engagement clutch is engaged, and when the attachment is connected to the drive rotation shaft, an end surface of the attachment pushes the sleeve to slide the sleeve, The drive device according to any one of claims 2 to 4, wherein the engagement clutch is separated. The drive device according to any one of claims 2 to 5, wherein a detent mechanism is provided between the drive rotation shaft and the sleeve to position the engagement clutch at a position where the engagement clutch is engaged and a position where the engagement clutch is separated. . The drive device according to any one of claims 1 to 6, wherein the fitting clutch includes two members formed with a plurality of concave and convex portions that fit into each other. The drive device according to any one of claims 1 to 7, wherein the handle is provided with a rod that comes into contact with a tip of the drive rotary shaft when the fitting clutch is engaged.

Images