JPH0632489U - Mast device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent noise caused by jumping up and down of the lifting body. The lower moving body 7 and the elastic body 9 for detecting the jump of the lifting body 4 are provided, and the lifting blocking means 10 for blocking the lifting of the lifting body 4 is provided, and these are linked by a linking means 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a mast device applied to a cargo handling vehicle such as a forklift truck.

[0002]

[Prior art]

 Conventionally, as the mast device of this type, those described in, for example, Japanese Utility Model Publication No. 52-7627 and Japanese Utility Model Publication No. 52-7628 are known. This is basically a fixed mast, a movable mast that can be moved up and down on the fixed mast, a lifting body that can be moved up and down on the movable mast, and a lift that moves the movable mast up and down with respect to the fixed mast. The cylinder, the rope car provided on the upper part of the moving mast or the lift cylinder, the rope provided between the fixed side and the lifting body, and suspended on the rope car, and the fixed mast and the lifting body. From a blocking state, which is provided between the blocking mast to prevent the elevator body from descending and descending relative to the fixed mast, to a permitting state in which the relative ascending and descending are permitted, and an operating body for controlling the descending blocking means. It is configured. However, in such a device, since the descent blocking means for blocking the lowering of the lifting body with respect to the fixed mast is provided between the fixed mast and the lifting body, only the descent can be blocked at a predetermined position. It was For this reason, when such a mast device is mounted on a cargo handling vehicle, for example, when traveling on a rough road with no load, the lifting body may jump up due to the unevenness of the road surface and the rope may become loose. There was a problem that noise (a sound of a rope striking a lift cylinder, a sound of rattling of a fork, a sound of rattling of an end roller, etc.) was generated.

[0003]

[Problems to be solved by the device]

 The present invention was devised to solve this problem in view of the above problems, and the object thereof is to provide a mast device that prevents noise due to jumping up and down of an elevating body. It is in.

[0004]

[Means for Solving the Problems]

 The mast device of the present invention is basically a fixed mast, a movable mast that is vertically movable on the fixed mast, an elevating body that is vertically movable on the movable mast, and a movable mast with respect to the fixed mast. A lift cylinder that raises and lowers the moving mast, a rope wheel provided on the upper part of the moving mast or the lift cylinder, a lower moving body that is provided so as to be able to move downward on the lifting body, and is provided between the fixed side and the lower moving body. Provided between the moving mast and the elevating body, and the elastic body provided between the elevating body and the lower moving body to move the lower moving body downward with respect to the elevating body. Is provided between the lower moving body and the vertical movement blocking means, and the vertical movement preventing means capable of operating from a blocking state in which these relative vertical movements are blocked to an allowable state in which these relative vertical movements are allowed, When the ascending / descending blocking means is blocked when climbing Lies characterized in that consisted, and cooperative means for lifting the blocking means to an acceptable state except when rise of the lifting body relative to the lower body to.

[0005]

[Action]

 When the lift cylinder is operated, the moving mast is moved up and down with respect to the fixed mast by the rope wheel and the rope, and the lifting body is moved up and down with respect to the moving mast. If the lifting / lowering body does not jump up with respect to the moving mast, the rope is strained so that the lower moving body does not move down with respect to the lifting / lowering body, and the lifting / lowering prevention means is allowed by the connecting means to prevent the moving mast from moving. Lifting of the lifting body is allowed. When the lifting / lowering body jumps up with respect to the moving mast, the rope is loosened and the lower moving body is lowered by the elastic body with respect to the lifting / lowering body. Lifting of the body is blocked. Therefore, the ascending / descending body is prevented from jumping up with respect to the moving mast, and noise due to this is prevented.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view showing a mast device according to a first embodiment of the present invention. The mast device 1 includes a fixed mast 2, a moving mast 3, an elevating body 4, a lift cylinder 5, a rope wheel 6, a lower moving body 7, a rope 8, an elastic body 9, an elevating prevention means 10, and a connecting means 11. Parts are made up. The fixed mast 2 forms a basic part of the mast device 1, and in this example, a lower portion is attached to a vehicle body (not shown) of a forklift so that the lower portion can be tilted forward and backward. A tilt cylinder (not shown) that tilts the fixed mast 2 back and forth is provided between the fixed mast 2 and the vehicle body. The moving mast 3 is provided on the fixed mast 2 so as to be able to move up and down, and in this example, is provided with a stopper 12. Between the moving mast 3 and the fixed mast 2, an end roller and a side roller (both not shown) for smoothing the lifting and lowering of the moving mast 3 are arranged. The elevating body 4 is provided so as to be movable up and down on the moving mast 3. In this example, the elevating body 4 includes a lift bracket 13, a finger bar 14, and a fork 15. Between the lift bracket 13 of the lifting body 4 and the moving mast 3, an end roller 16 and a side roller (not shown) for smoothing the lifting of the lifting body 4 are arranged. The lift cylinder 5 moves the moving mast 3 up and down with respect to the fixed mast 2. In this example, it is a single-acting type, and the tail side is fixed to the fixed mast 2 so that it can be freely lifted. A predetermined free lift interval is formed between the rod side and the stopper 12. The rope wheel 6 is provided above the moving mast 3 or the lift cylinder 5. In this example, the rope wheel 6 is a sheave and is provided on the rod side of the lift cylinder 5 so as to be rotatable around the horizontal axis. The lower moving body 7 is provided on the elevating body 4 so as to be able to move downward. In this example, a chain bracket 17 attached to the lift bracket 13 and an eyebolt 18 provided so as to be able to move downward, It consists of a double nut 19 screwed to the bottom of this. The rope 8 is provided between the fixed side and the lower moving body 7 and is hung on the rope wheel 6. In this example, the rope 8 is a chain, and one end of the rope 8 is fastened to the fixed mast 2. At the same time, the other end is fastened to the upper part of the eyebolt 18, and the middle is hung on the rope wheel 6. The elastic body 9 is provided between the elevating body 4 and the lower moving body 7 to move the lower moving body 7 downward with respect to the elevating body 4. In this example, the elastic body 9 is a compression spring and is It is interposed between the double nut 19. The lifting prevention means 10 is provided between the moving mast 3 and the lifting body 4 and is operable from a blocking state that blocks the relative lifting of these to a permitting state that allows the relative lifting of these. Then, the lift bracket 13 is provided with an arm 20 which can be elevated and a friction such as rubber which is provided between the front end flange of the movable mast 3 and the lower end roller 16 which is provided at the tip of the arm 20. A plate 21, a stopper 22 provided on the lift bracket 13 for restricting the elevating rotation of the arm 20, and provided between the lift bracket 13 and the arm 20 to urge the arm 20 to the erect state. It consists of a return spring 23. The connecting means 10 is provided between the lower moving body 7 and the lifting / lowering prevention means 10, and when the lifting / lowering body 4 is raised relative to the lower moving body 7, sets the lifting / lowering prevention means 10 in a blocking state and raises the lifting / lowering body 4 with respect to the lower moving body 7. The lifting prevention means 10 is set to an allowable state except when the time is set. In this example, a rod whose length is adjustable such as a turnbuckle is provided, and it is provided between the lower part of the eyebolt 18 and the middle of the arm 20. It is installed. Next, the operation will be described based on such a configuration. When the lift cylinder 5 is operated, the moving mast 3 is moved up and down with respect to the fixed mast 2 by the rope wheel 6 and the rope 8 and the lifting body 4 is moved up and down with respect to the moving mast 3. When the lifting / lowering body 4 does not jump up with respect to the moving mast 3, as shown in FIG. 1, the rope 8 is strained so that the lower moving body 7 is not lowered with respect to the lifting / lowering body 4, and the lifting and lowering is prevented by the connecting means 11. The means 10 is set in the permitting state, and the lifting / lowering of the lifting / lowering body 4 is permitted with respect to the moving mast 3. When the lifting / lowering body 4 jumps up with respect to the moving mast 3, the rope 8 is relaxed and the lower body 7 is moved down with respect to the lifting / lowering body 4 by the elastic body 9 and the arm of the lifting / lowering prevention means 10 by the connecting means 11. 20 is laid down against the return spring 23, and the friction plate 21 is inserted between the front flange of the moving mast 3 and the lower end roller 16 to be in a blocking state. Is prevented from moving up and down. Therefore, the ascending / descending body 4 is prevented from jumping up with respect to the moving mast 3, and the noise caused by this is generated, for example, the sound of the rope 8 hitting the lift cylinder 5, the sound of the fork 15 rattling, and the sound of the end roller 16 rattling. Etc. are prevented.

Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the lower moving body 7 and the elastic body 9 are used as a single-acting drive cylinder 24 of the spring return type provided in the lift bracket 13, and the lifting prevention means 10 is provided in the lift bracket 13. A return type single-acting driven cylinder 25, a block 26 whose length is adjustable on the rod side of the cylinder 26, and a friction plate 27 made of rubber or the like fitted to the block 26 and fitted to the front flange of the moving mast 3. And that the connecting means 11 is composed of a conduit 28 for connecting the tail chambers of both cylinders 24, 25 and an oil liquid 29 enclosed inside these conduits, so-called hydraulically connected. Is different from the first embodiment.

Although the elastic body 9 is interposed between the chain bracket 17 and the double nut 19 in the first embodiment, the elastic body 9 is not limited to this, and as described in, for example, Japanese Utility Model Laid-Open No. 57-53497, these are used. A spacer with a collar may be provided between the collar and the chain bracket 17, and the spacer may be interposed between the collar and the chain bracket 17. In this way, the elastic body 9 is not unnecessarily pressed by the load of the lifting body 4. In the first embodiment, the lifting / lowering prevention means 10 is inserted between the front flange of the moving mast 3 and the lower end roller 16, but the invention is not limited to this, and the moving mast may be expanded, for example. It may be one that fits the front and rear flanges of 3. In the first embodiment, the lifting spring 10 is provided with the return spring 23 and the second embodiment is provided with the return spring of the driven cylinder 25. However, the present invention is not limited to this. For example, this may be omitted. .

[0009]

[Effect of device]

 As described above, according to the present invention, the following excellent effects can be obtained. (1) It consists of a fixed mast, a moving mast, a lifting body, a lift cylinder, a rope wheel, a lower moving body, a rope, an elastic body, a lifting prevention means, and a connecting means, and especially detects the jumping of the lifting body. Since the lower moving body and the elastic body are provided, and the ascending / descending preventing means for preventing the ascending / descending body from ascending / descending is provided, and these are connected by the connecting means, it is possible to prevent noise due to the ascending / descending of the ascending / descending body. (2) The lower moving body and the elastic body detect the jumping of the lifting body, and the lifting blocking means prevents the lifting of the lifting body through the connecting means, so that the driver's operation is completely unnecessary. , Very reasonable.

[Brief description of drawings]

FIG. 1 is a schematic view showing a mast device according to a first embodiment of the present invention.

FIG. 2 is a schematic view showing a mast device according to a second embodiment of the present invention.

[Explanation of symbols]

1 ... Mast device, 2 ... Fixed mast, 3 ... Moving mast, 4
... Lifting body, 5 ... Lift cylinder, 6 ... Rope wheel, 7 ... Lower moving body, 8 ... Rope, 9 ... Elastic body, 10 ... Lifting blocking body, 11 ...
Connection means, 12 ... stopper, 13 ... lift bracket,
14 ... Finger bar, 15 ... Fork, 16 ... End roller, 17 ... Chain bracket, 18 ... Eye bolt,
19 ... Double nut, 20 ... Arm, 21 ... Friction plate, 2
2 ... stopper, 23 ... return spring, 24 ... drive cylinder, 25 ... driven cylinder, 26 ... block, 27
... friction plate, 28 ... conduit, 29 ... oil liquid.

Claims (1)

[Scope of utility model registration request] 1. A fixed mast, a movable mast that is vertically movable on the fixed mast, an elevating body that is vertically movable on the movable mast, a lift cylinder that vertically moves the movable mast with respect to the fixed mast, and a movable mast. The rope wheel provided on the upper part of the mast or the lift cylinder, the lower moving body provided on the elevating body so as to be able to move downward, and the rope wheel provided between the fixed side and the lower moving body. A cord, an elastic body provided between the elevating body and the lower moving body to move the lower moving body downward with respect to the elevating body, and provided between the moving mast and the elevating body to prevent relative elevation of these. Elevation blocking means operable from a blocking state to a permissible state for permitting relative lifting thereof, and a lifting blocking means provided between the lower moving body and the lifting blocking means to bring the lifting blocking means into a blocking state when the lifting body rises with respect to the lower moving body. With the upper and lower body against the lower moving body A mast device characterized by comprising a connecting means for bringing the up-down prevention means into an allowed state except at the time of rising.