JP3149826B2 - Leg structure of onboard crane - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leg structure of a vehicle-mounted crane used for mounting a wheelchair or the like in a vehicle.

[0002]

2. Description of the Related Art FIG. 6 is a rear perspective view of a one-box truck having a vehicle-mounted crane CR provided near a rear opening O. FIG. The column 1 constituting the leg of the vehicle-mounted crane CR is erected at a position near the rear opening edge O of the vehicle cabin. Column 1
A first arm 21 and a second arm 22 are connected to an upper end of the second arm 22. A suspension belt 23 hangs downward from a head of the second arm 22 having a built-in motor.
4 are connected.

FIG. 7 is an overall perspective view of an on-board crane CR. The lower end of the cylindrical column 1 is inserted into a support pipe 3, and the support pipe 3 stands on a base plate 4 provided on a vehicle floor. A first arm 21 extends diagonally upward from the upper end of the column 1 while being supported by an arm support 25, and a second arm 22 further extends diagonally upward at the end thereof. When mounting a wheelchair or the like in the vehicle, grasp the handle 26 provided on the side surface of the first arm 21,
First and second arms 2 around the axis together with the column 1
The entirety of the members 1 and 22 (hereinafter, both are simply referred to as arms) is turned out of the vehicle through the rear opening (arrows in FIG. 7).

FIG. 8 shows details of a structure for supporting the column 1 rotatably about its axis. The support pipe 3 is fixed on the base plate 4 by triangular reinforcing ribs 31 provided at a plurality of locations on the outer periphery thereof. The lower end of the column 1 inserted into the support pipe 3 via the bearing ball 52 is placed on the bearing receiver 51. On the outer wall of the support pipe 3, there is provided a locking piece 6 made of a long plate bent in an elliptical shape.
1 is rotatably supported on the outer wall of the support pipe 3.
A spring member 64 is provided between the long side 62 of the locking piece 6 and the outer wall of the pipe, and urges the long side 62 to be separated from the outer wall of the pipe. As a result, the short side 63 of the locking piece 6 is pressed toward the outer wall of the pipe, and the locking pin 65 erected on the short side 63 projects through the opening 32 of the outer wall of the pipe into the support pipe 3. ing.

At the outer periphery of the lower end of the column 1, two locking holes 11 and 12 are formed in the circumferential direction.
When the column 2 is turned to the storage position facing the inside of the vehicle, the locking pin 65 enters the locking hole 12 and positions the column 1. On the other hand, when the arms 21 and 22 rotate the column 1 to the lifting position facing the outside of the vehicle, the locking pins 65 enter the locking holes 11 to position the column 1.

[0006]

In the above conventional leg structure, the long side 62 of the locking piece 6 is pressed against the spring member 64 each time the arms 21 and 22 need to be turned, thereby shortening the length. Side 63
It is necessary to retreat the locking pin 65 of the column 1 from the locking holes 11 and 12 of the column 1, and there is a problem that the operation is troublesome.
In particular, in the retracted position, it is necessary to restrict the turning of the column 1 so that the arms 21 and 22 do not turn in an unexpected direction due to the vibration of the vehicle during running, etc. This is because the handle 26 (FIG. 7) is being grasped, and therefore, it is required to have a quicker operation when the wheelchair is mounted than to restrict the turning of the arms 21 and 22.

In order to allow the column 1 to freely rotate, the conventional leg structure uses a bearing receiver 51 and a bearing ball 52. The bearing ball 52 tilts the support pipe 3 during maintenance or the like. Therefore, it was difficult to effectively utilize the vehicle compartment space by making the entire on-vehicle crane a collapsible structure.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and a first object of the present invention is to provide a vehicle crane leg capable of reliably positioning an arm turning position and ensuring quick operation. It is to provide a structure.
It is a second object of the present invention to provide a leg structure of a vehicle-mounted crane which is easy to maintain and can be entirely collapsed.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, a column (1) constituting a leg portion of an on-vehicle crane is provided in a support pipe (3) erected on a vehicle floor. The column is inserted so as to be rotatable around the axis of the column, and the column (1) inserted into the support pipe (3) is formed with a recess (93).
Of both ends in the circumferential direction of the stopper (93a, 93
b), the stopper plate (311) is projected from the inner wall of the support pipe (3) into the recess (93), and one of the stopper surfaces (93a) is in contact with the stopper plate (311). To provide rotation restricting means (6, 13) for restricting the rotation of the column (1).

In the first aspect of the present invention, the column is stopped when each stopper surface comes into contact with the stopper plate, and the arm of the on-board crane is positioned at the storage position and the lifting position, respectively. In the retracted position, the rotation of the column is restricted by the rotation restricting means, so that the arm does not turn in an unexpected direction due to vibration or the like during traveling of the vehicle. In the lifting position, the column or arm is positioned only by the stopper surface abutting against the stopper plate. Therefore, after lifting the wheelchair or the like, it is necessary to remove the locking pin from the locking hole of the column as in the related art. The arm can be swung to the storage position without any change, and quick work can be performed. Further, the stopper plate for realizing the positioning and the recess forming the stopper surface are both located in the support pipe, so that the appearance is good.

In the second aspect of the present invention, the insertion end (9) of the column (1) has a small diameter with a step, and this step is supported by a cylindrical bush metal (8).

In the second aspect of the present invention, the bush metal allows the column to rotate freely. In addition, since the support pipe does not spill out when the support pipe is inclined as in the case of a conventional bearing ball, maintenance and the like are easy, and the entire vehicle-mounted crane can be collapsed to effectively use the passenger compartment space. .

The reference numerals in parentheses indicate the correspondence with specific means described in the embodiments described later.

[0014]

FIG. 1 is an exploded view of a crane leg for a vehicle. The structure other than the crane legs described below is the same as the conventional structure described above. In the figure, a lower end of a column 1 constituting a crane leg is inserted into a support pipe 3 erected on a base plate 4 via a collar body 7 and a bush metal 8 made of sintered metal or the like. Has been inserted. That is, a cylindrical stopper body 9 is joined to the lower end of the cylindrical column 1, and the stopper body 9 has a stepped small diameter except for the upper end part 91 (FIG. 2). The stepped portion 92 of the stopper body 9 has a flange 8 around the entire upper end.
1 is inserted into the cylindrical collar body 7 inserted into the support pipe 3 through the cylindrical bushing metal 8 having the column 1 so that the column 1 is rotatable around its axis in a vertical posture. It is supported by.

The lower end of the cylindrical wall of the stopper body 9 is cut out within a certain angle range as described later.
In the 3, lower end inner peripheral portion 311 of the reinforcing ribs 31 which are attached to the support pipe 3 is notch of the support pipe 3 and the color body 7 3
3 , 71 and penetrates to form a stopper plate. The lower edge of the stopper plate 311 is fitted in a long hole 41 formed in the base plate 4. Both ends of the notch 93 of the stopper body 9 in the circumferential direction are stopper surfaces 93, respectively.
a, 93b, between the position shown in FIG. 3 where the stopper surface 93a contacts one side surface of the stopper plate 311 and the angle range X from the position where the stopper surface 93b contacts the other side surface of the stopper plate 311. , Stopper body 9, ie, column 1
Can rotate. As described above, since the lower edge of the stopper plate 311 is fitted in the elongated hole 41 (FIG. 2), the stopper plate 311 can sufficiently withstand the impact when the stopper surfaces 93a and 93b abut. .

In FIG. 1, a locking piece 6 is provided on the outer wall of the support pipe 3 and has the same structure as that described in the prior art. That is, the locking piece 6 formed of a long plate bent in a letter shape is rotatably supported by the outer wall of the support pipe 3 at the bent portion 61, and the long side portion 62 is separated from the pipe outer wall by the spring member 64. It is urged to separate. As a result, the short side 63 of the locking piece 6 is pressed toward the outer wall of the pipe, and the locking pin 65 erected on the short side 63 passes through the opening 32 of the outer wall of the pipe and enters the support pipe 3. It is protruding.

On the other hand, a locking hole 13 is formed at one place on the outer periphery of the lower end of the column 1, and the column 1 is rotated until the stopper surface 93 a of the stopper body 9 contacts the stopper plate 311 ( 3), as shown in FIG.
The locking pin 65 provided on the locking piece 6 enters the locking hole 13 of the column 1 through the opening 32 (FIG. 1) in the outer wall of the pipe. In this state, the arms 21 and 22 of the on-board crane
(See FIG. 7) faces the vehicle interior, and the rotation of the column 1 is regulated, so that the arms 21 and 22 do not turn in unexpected directions due to vibrations or the like during traveling of the vehicle.

When a wheelchair or the like is carried into the vehicle interior, when the long side 62 of the locking piece 6 is pushed toward the outer wall of the support pipe 3 against the spring force of the spring member 64, the length is shortened accordingly. The side portion 63 rotates so as to be separated from the outer wall of the pipe, and the locking pin 65 retreats from the locking hole 13 of the column 1. As a result, the column 1 becomes rotatable, and when the arms 21 and 22 of the vehicle-mounted crane are turned out of the vehicle, as shown in FIG.
Column 1 rotates until it abuts against arms 1 and 2
2 is positioned outside the vehicle. After lifting the wheelchair with the hook 24 at the tip of the belt 23 of the vehicle-mounted crane,
When the arms 21 and 22 are turned again in the vehicle inward direction, the column 1 rotates until the stopper surface 93a of the stopper body 9 comes into contact with the stopper plate 311. At this position, the locking pin 65 of the locking piece 6 moves the column 1 rotation enters again the latch hole 13 of is regulated (the state of FIG. 4).

As described above, according to the on-vehicle crane of this embodiment, the stopper 9 is provided at the lower end of the column 1, and the stopper surfaces 93 a and 93 b formed on the stopper 9 and a part of the reinforcing rib 31 are provided. The column 1 is positioned by contact with the formed stopper plate 311. Therefore, in the lifting position outside the vehicle, the handle 2 of the first arm 21
If the stopper surface 93b is pressed against the stopper plate 311 by holding the arm 6 (see FIG. 7), the arms 21 and 22 can be reliably held at the lifting position. In addition, the column 1 is securely positioned by the stopper surface 93a and the stopper plate 311 even in the storage position in the vehicle, so that the locking pin 65 can be smoothly inserted into the locking hole 32 of the column 1. it can.

Then, the stopper body 9 and the stopper plate 3
11 are located inside the support pipe 3 so that they are not exposed to the outside and have a good appearance. In the lifting position, the column 1 is positioned only by the contact between the stopper surface 93b and the stopper plate 311. Therefore, after the wheelchair or the like is lifted by the hook 24, the arms 21 and 22 are immediately turned in the vehicle interior direction. And quick work is possible. Further, by replacing the support of the column 1 with the bushing metal 8 from the conventional bearing ball 52, the problem that the bearing ball 52 spills out of the support pipe 3 during maintenance or the like is solved, and, as a result, It becomes possible to make the whole crane a collapsible structure.

[0021]

As described above, according to the leg structure of the on-vehicle crane of the present invention, the turning position of the arm can be reliably determined, and the speed of operation can be secured. Further, maintenance is easy, and the entire on-vehicle crane can be made to have a collapsible structure.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an on-vehicle crane leg, showing one embodiment of the present invention.

FIG. 2 is a vertical sectional view of a vehicle crane leg.

FIG. 3 is a horizontal sectional view of a vehicle-mounted crane leg.

FIG. 4 is a cutaway perspective view of a vehicle-mounted crane leg.

FIG. 5 is a cutaway perspective view of the on-vehicle crane leg with the column pivoted to another position.

FIG. 6 is a perspective view in which a rear door of a one-box car provided with a vehicle-mounted crane is opened.

FIG. 7 is an overall perspective view of the on-vehicle crane.

FIG. 8 is an exploded perspective view of a conventional on-vehicle crane leg.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Column, 13 ... Locking hole, 3 ... Support pipe, 311 ...
Stopper plate, 6: locking piece, 8: bush metal, 9: stopper body (insertion end), 93: notch (recess), 93a,
93b: Stopper surface.

Continuation of front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B66C 23/00-23/94

Claims (2)

(57) [Claims] 1. A column which is inserted into a support pipe erected on a vehicle floor by inserting a column constituting a leg portion of an on-vehicle crane so that the column is rotatable around its axis and which is inserted into the support pipe. A concave portion is formed in the portion, and both end surfaces in the circumferential direction of the concave portion serve as stopper surfaces, and a stopper plate projects from the inner wall of the support pipe into the concave portion, and one of the stopper surfaces contacts the stopper plate. A leg structure of an on-vehicle crane, comprising a rotation restricting means for restricting rotation of a column in a contact state. 2. The insertion end of the column has a small diameter with a step.
The leg structure of a vehicle-mounted crane according to claim 1, wherein the stepped portion is supported by a cylindrical bush metal.