JPS6234945Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a locking device for an operating lever installed in the driver's cab of a truck crane or the like.

Conventionally, such a locking device has been designed such that a locking member operated by the driver's foot is pivoted on the floor on the driver's side of the operating lever, and a groove provided at the tip of the locking member is placed on the floor closer to the driver than the operating lever. Japanese Utility Model Application No. 57-138881 discloses a device in which a stopper arm that protrudes in the direction can be engaged and disengaged at the neutral position of the operating lever, but the locking device is located on the side of the operating lever. Therefore, when multiple control levers are installed in parallel in front of the driver's seat, such as in a truck crane, the control levers can be selectively locked with the driver's foot or rotated back and forth from the neutral position. Not only is it difficult to do so, but there is also a risk of accidentally locking an adjacent operating lever when locking an unused operating lever.

Therefore, both ends of a long cargo can be suspended from the winding cables of both the main and auxiliary hoisting drums, and the crane swivel platform can be rotated to raise and lower the cargo at the same time. It is not possible to simultaneously control the three operating levers with both hands and feet, such as raising and lowering the crane, rotating the crane swivel table, and raising and lowering the boom at the same time. Furthermore, it is not only difficult to prevent erroneous operation of the unused operating lever by locking it in the neutral position, but also there is a risk of accidentally locking the operating lever that should be used.

The present invention addresses this problem by forming each operating lever 1 above the pivot portion 1a to the floor into a U-shaped portion 1b that projects forward from the pivot portion, respectively. A sub-pedal plate 2 is fixed on the front bottom of the U-shaped portion, and a rear end of the sub-pedal plate is provided with a
A main pedal plate 3 supported at the rear bottom of each U-shaped portion 1b is pivoted so as to be foldable upward, and an arm 4 projecting forward is integrally provided on the lower surface of each main pedal plate. When the main pedal plate 3 is folded upward in the neutral position of the operation lever 1, a protrusion 6 that is to be engaged with a groove of a restraint member 7 attached to the floor side is made to protrude from the tip of each arm 4. The center line connecting the projection 6 engaged with the restraining member and the pivot shaft 5 at the front end of the main pedal plate intersects the center line connecting the operation lever pivot shaft 8 to the floor and the projection 6. It is characterized by

In the illustrated embodiment of the present invention, the front end of the main pedal plate 3 is pivoted by a shaft 5 to the rear end of the auxiliary pedal plate 2 fixed to the operating lever 1, so that the main pedal plate 3 shown in FIG. In the position of use, its arm 4
The tip thereof is configured to abut against the lower surface of the sub-pedal plate 2, and the pin-shaped protrusion 6 engages with the groove of the plate-shaped restraining member 7 when the operating lever 1 is in the neutral position. The manual operating lever 1 has a U-shaped portion 1 above its pivot portion 1a to the floor 9.
A switching link 10 of a three-position directional switching valve mounted under the rear floor is connected to an arm portion 1c which projects forward (to the right in the figure) and extends downward from the pivot portion 1a.

In the figure, reference numeral 11 indicates a hinge with attachment parts welded to both the main and sub-pedal plates 3 and 2, 12 indicates a support portion of the operating lever pivot shaft 8 attached to the floor 9, 1d indicates the grip of the operating lever 1, and the main pedal When the tip of the arm 4 welded to the lower surface of the plate 3 comes into contact with the lower surface of the auxiliary pedal plate 2, the plate 3 rests on the bottom side of the U-shaped portion 1b of the operating lever via the hinge 11.

Since the present invention has the above configuration, the main pedal plate 3 is connected to the U-shaped portion 1b of the operation lever as shown in FIG.
When the pedal is engaged with the bottom side of the lever, the operating lever 1 can be rotated forward from the neutral position shown in the figure by pressing down on the front end of the sub-pedal plate 2 or the main pedal plate 3 with your foot in the direction of arrow C. Alternatively, the operating lever 1 can be rotated rearward by pushing down the rear part of the main pedal plate 3 in the direction of the arrow D.

Also, when locking the operating lever in the neutral position,
When the main pedal plate 3 is lifted up to the folded position about the pivot shaft 5 as shown in FIG. 3, the protrusion 6 at the tip of the arm 4 fits into the groove of the restraint member 7. In this state, the center line A between the protrusion 6 and the shaft 5 intersects the center line B between the protrusion and the shaft 8, and the protrusion 6 is engaged with the restraint member 7 due to the weight of the main pedal plate 3, etc. Therefore, rotation of the operating lever 1 about the pivot shaft 8 is prevented by the arm 4.

According to the present invention, the driver can rotate the control lever back and forth and lock it in the neutral position using his or her feet, so the driver can use both hands and feet to operate the control lever.
Since multiple operating levers can be controlled simultaneously, and the main and sub-pedal plates and locking device are located approximately on the rotating surface of the operating lever, there is no risk of accidentally locking the operating lever that should be used, and there is no risk of accidental locking. This has the effect of locking the operating lever in use at the neutral position and preventing erroneous operation of the operating lever that is not in use.

[Brief explanation of the drawing]

FIG. 1 is a side view of one embodiment of the present invention, FIG. 2 is a view taken along the X arrow in FIG. 1, and FIG. 3 is a side view of the main parts when the operating lever is locked. 1... Operation lever, 2... Sub-pedal board, 3...
Main pedal board, 4... Arm, 5... Pivot shaft, 6...
...Protrusion, 7...Restriction member, 8...Operation lever pivot shaft, 9...Floor, 10...Switching link of directional switching valve.

Claims (1)

[Scope of utility model registration request] When a plurality of operating levers with pedals that rotate back and forth from the neutral position are arranged in parallel in front of the driver's seat, each operating lever 1 above the pivot portion 1a connected to the floor projects forward from the pivot portion. U-shaped part 1b
A secondary pedal plate 2 is fixed to the front bottom of each U-shaped portion, and the secondary pedal plate 2 is supported by the rear bottom of the U-shaped portion 1b at the rear end of the secondary pedal plate. The main pedal plate 3 is pivoted so as to be foldable upward, and an arm 4 projecting forward is integrally provided on the lower surface of each main pedal plate, so that the main pedal plate 3 is pivoted upward when the operating lever 1 is in the neutral position. When I turned back to
A protrusion 6 to be engaged with a groove in a restraint member 7 attached to the floor side is projected from the tip of each arm 4, and the protrusion 6 engaged with the restraint member is connected to the pivot shaft 5 at the front end of the main pedal plate. The center line is the operating lever pivot shaft 8 to the floor.
A locking device for an operation lever, characterized in that it is configured to intersect with a center line connecting the protrusion 6 and the projection 6.