JP4746866B2 - Backlash prevention device for carriage - Google Patents

Description

  The present invention relates to an improvement in a carriage backlash suppression device that is applied to a cargo handling vehicle such as a forklift to suppress carriage backlash.

Conventionally, for example, the following devices are known as this type of carriage backlash suppression device.
(1) An elastic body that is always in contact with the mast is provided on the outer periphery of the lift roller (see Patent Document 1).
(2) An elastic body is provided between a lift roller that is always in contact with the mast and the bearing (see Patent Document 2).
(3) An elastic body that is always in contact with the mast is provided between the outer mast and the inner mast, and is provided between the inner mast and the lift bracket (see Patent Document 3).
(4) An elastic body that is always in contact is provided between the lift bracket and the inner mast (see Patent Documents 4 and 5).
(5) An elastic body that is contacted at the time of swinging is provided between the finger bar and the inner mast (see Patent Document 6).
(6) A combination made of resin that is brought into contact with a roller during the peristalsis is provided between the finger bar and the inner mast or between the inner mast and the outer mast (see Patent Document 7).

Japanese Examined Patent Publication No. 46-42730 Japanese Utility Model Publication No. 50-14171 Japanese Utility Model Publication No. 61-13514 Utility model registration No. 2507620 Japanese Utility Model Publication No. 2-64592 Japanese Patent Laid-Open No. 5-70092 JP-A-8-113490

However, in the above (1) to (4), the elastic body is always in direct or indirect contact with the mast, so that the backlash is excellent, but the elastic body is severely worn and replaced early. I had to do it.
On the other hand, in the cases (5) and (6), the elastic body and the combined body are not always in contact with the mast, so that the replacement time can be extended, but at the time of swinging, they come into contact with the mast shockingly. Therefore, the backlash suppression effect was not good.
In short, none of the conventional ones has their merits and demerits, has an excellent backlash suppressing effect, and has no extension of the replacement period of the elastic body or the like.

  The present invention was devised in view of the above-mentioned problems, and was devised to solve this problem. The subject of the present invention is that it has an excellent backlash suppression effect and can extend the replacement time of an elastic body or the like. Another object of the present invention is to provide a carriage backlash suppressing device.

  The carriage backlash suppression device of the present invention basically includes a mast, a carriage that can be moved up and down along the mast, and a sliding contact body that is elastically provided on one of the mast and the carriage via an elastic body. And a sliding contact body that is provided on either the mast or the carriage and is slidably contacted with the sliding contact body when the carriage is in a no-load running posture.

The carriage is raised and lowered along the mast. When the carriage is lowered from the raised position to the no-load running posture, the sliding contact body elastically supported by the elastic body is brought into sliding contact with the sliding contact body. Then, the backlash of the carriage with respect to the mast is restrained from being relaxed by the elastic action of the elastic body.
Since the sliding contact body is slid to the sliding contact body when the carriage is in the no-load running posture and is not slid contact at any other time, the wear can be reduced and the life can be extended as compared with the case where the sliding contact body is always sliding contact. . Since the elastic body is elastically deformed only at the time of sliding contact between the sliding contact body and the sliding contact body, the elastic deterioration is reduced and the life can be extended.
Since the sliding contact body is elastically slid to the sliding contact body by the elastic body when the carriage is in a no-load running posture where play is a problem, there is little possibility of sliding contact, and the backlash is suppressed. The effect can be demonstrated accurately.

  The mast preferably includes an outer mast and an inner mast that can be moved up and down along the outer mast. The sliding contact body is preferably provided on the carriage, and the sliding contact body is preferably provided on the outer mast. In this way, the structure is simplified and the outer mast on the fixed side is compared with the case where the sliding contact body and the sliding contact body are provided between the outer mast and the inner mast and between the inner mast and the carriage. The backlash of the carriage can be directly suppressed, and the backlash suppression effect is greatly improved.

  The sliding contact body preferably has a disk shape centered on the front-rear direction axis and is slidable, and the sliding contact body preferably has a sled plate shape. In this way, since the sliding contact body is provided in a disc-like shape so as to be freely movable, each time the sliding contact body comes into contact with the sliding contact body, a different location of the sliding contact body is rotated. Can prevent uneven wear (so-called sliding) of the sliding contact body and uneven elastic deterioration of the elastic body, and the sliding contact body has a sled plate shape, so that smooth sliding with the sliding contact body can be achieved. Contact is possible.

According to the present invention, the following excellent effects can be achieved.
(1) A mast, a carriage, a sliding contact body, and a sliding contact body, and in particular, either the mast or the carriage is provided with a sliding contact body via an elastic body, and the mast or the carriage has a carriage on the other side. Since the sliding contact body that is slidably contacted with the sliding contact body during the no-load traveling posture is provided, it is possible to improve the backlash suppression effect and extend the replacement time of the elastic body and the like.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing a carriage backlash suppressing device according to the present invention. FIG. 2 is a plan view of FIG. FIG. 3 is a view similar to FIG. 1 showing a no-load running posture. FIG. 4 is a longitudinal side view showing an enlarged main part.

  The carriage backlash suppressing device 1 is composed of a mast 2, a carriage 3, a sliding contact body 4, and a sliding contact body 5, and is applied to a cargo handling vehicle such as a forklift.

The mast 2 forms a basic part of the carriage backlash suppressing device 1, and in this example, the outer mast 6 is provided on the front side of the vehicle body (not shown) of the cargo handling vehicle so as to be able to tilt back and forth, and is moved up and down along this. The inner mast 7 is provided.
The outer mast 6 is provided with left and right frame members 8 having a substantially C-shaped cross section and disposed so that the groove portions face each other, and an appropriate connecting member 9 for connecting them.
The inner mast 7 is disposed on the inner side of the outer mast 6, and includes a left and right frame member 10 that has a substantially J-shaped cross section and is disposed so that the groove portions face each other, and an appropriate connecting member 11 that connects them. .
Although not shown, a lift roller (an end roller or a side roller) is provided between the outer mast 6 and the inner mast 7 to smoothly move the inner mast 7 up and down with respect to the outer mast 6.

The carriage 3 can move up and down along the mast 2. In this example, the carriage 3 includes left and right lift brackets 12 that can move up and down along the inner mast 7, and finger bars 13 provided on the front side thereof.
The finger bar 13 is divided into upper and lower parts, the left and right center plates 14 provided on the front side of the lift bracket 12 between them, and the left and right side plates provided between both ends of the finger bars 13. 15 and so on.
Although not shown, a lift roller (an end roller or a side roller) is provided between the lift bracket 12 and the inner mast 7 to smoothly lift and lower the lift bracket 12 with respect to the inner mast 7.
On the upper and lower sides of the finger bar 13, ridges 16 are formed, and a fork 17 is suspended so as to be laterally movable.
The fork 17 is a pair of left and right, and has a substantially L shape including a vertical piece and a horizontal piece, and upper and lower hooks 18 that are engaged with the protrusions 16 of the finger bar 13 are attached to the back of the vertical piece. Has been.

The sliding contact body 4 is elastically provided on one of the mast 2 and the carriage 3 via an elastic body 19. In this example, the sliding contact body 4 is provided on the carriage 3 and has a longitudinal axis as a center. It has a disk shape and is provided so as to be freely movable.
Specifically, the sliding contact body 4 is disposed on the front side of the mounting plate 20 suspended from the upper finger bar 13 of the carriage 3 via an elastic body 19 and is provided with a longitudinal axis depending on the loose coupling means 21. It is provided so that it can be freely rotated such as rotating around, moving in the front-rear direction, and swinging due to a gap.
The sliding contact body 4 is made of a wear-resistant material such as a synthetic resin and has a disk shape.
The elastic body 19 is made of an elastic material such as rubber and has a disk shape.
The mounting plate 20 has a flat plate shape and is attached to the upper finger bar 13 of the carriage 3 in a suspended state by welding.
The loose coupling means 21 includes a stepped hole 22 formed at the center of the sliding contact body 4, a through hole 23 formed at the center of the elastic body 19 and continuing to the small diameter portion of the stepped hole 22, and the mounting plate 20. A through hole 24 formed in the center and continuing to the through hole 23, a head at one end and a split pin hole at the other end are inserted into the stepped hole 22, the through hole 23, and the through hole 24 in a loosely fitted state. And the headed pin 25 that is received so that the head does not protrude from the large diameter part of the stepped hole 22 and the bifurcated part is expanded by being inserted into the split pin hole. 25 and a split pin 26 for preventing it from coming off.

The sliding contact body 5 is provided on one of the mast 2 and the carriage 3 and slides on the sliding contact body 4 when the carriage 3 is in a no-load running posture (when the fork 17 is between about 300 mm from the ground). In this example, it is provided on the outer mast 6 and has a sled plate shape.
Specifically, the slidable contact body 5 includes a vertical piece 27 whose front and back surfaces are directed in the front-rear direction, upper and lower warped pieces 28 that are continuously formed and warped rearward, and a vertical piece 27. Upper and lower mounting pieces 29 which are attached by welding and have a substantially L-shaped plane are provided. Upper and lower nuts 30 attached by welding to the side portion of the outer mast 6, and left and right holes formed in the mounting piece 29. It is detachably attached by means of a bolt 31 that is inserted into a through hole in the direction and screwed into the nut 30.
Thus, the front surface of the vertical piece 27 of the slidable contact body 5 and the rear surface of the slidable contact body 4 are arranged such that a predetermined overlap margin (approximately several mm) A is formed.

Next, the operation will be described based on such a configuration.
The inner mast 7 is raised and lowered along the outer mast 6, and the carriage 3 is raised and lowered along the inner mast 7, and the cargo handling operation is performed by the fork 17 suspended on the carriage 3.
When the carriage 3 is lifted from the no-load running posture, the sliding contact body 4 and the sliding contact body 5 are separated from each other without being in sliding contact, as shown by a chain line in FIGS. Yes.

From this state, when the carriage 3 is lowered to the no-load running posture, the sliding contact 4 is perpendicular to the warping piece 28 on the upper side of the sliding contact 5 as shown by the solid lines in FIGS. 3 and 4. The pieces 27 are sequentially slidably contacted.
At this time, the sliding contact body 4 is prevented from moving by contacting the sliding contact body 5, and a predetermined overlap margin A is formed between the sliding contact body 4 and the vertical piece 27 of the sliding contact body 5. Therefore, the elastic body 19 is compressed and deformed by being pushed forward relative to the slidable contact body 5.
As a result, the backlash in the longitudinal direction of the carriage 3 with respect to the outer mast 6 is suppressed by the elastic action of the elastic body 19, and the noise due to this is reduced.
In addition, the vertical movement of the carriage 3 due to the traveling vibration is also suppressed by the elastic action of the elastic body 19, and the accompanying rattling noise and chain jumping are reduced.

Since the sliding contact body 4 is slidably contacted with the sliding contact body 5 when the carriage 2 is in the no-load running posture and is not slidably contacted at any other time, the life of the sliding contact body 4 is reduced as compared with the case where the sliding contact body 4 is always in sliding contact. Is stretched. Since the elastic body 19 is also elastically deformed only at the time of sliding contact between the sliding contact body 4 and the sliding contact body 5, the elastic deterioration is reduced and the life is extended.
Since the sliding contact body 4 is elastically slidably contacted with the sliding contact body 5 by the elastic body 19 when the carriage 2 is in a no-load running posture where play is a problem, there is a possibility that the sliding contact body 4 may be slid impactively. There are few, and the backlash suppression effect is demonstrated exactly.

Since the sliding contact body 4 and the sliding contact body 5 are provided between the outer mast 6 and the carriage 3, the sliding contact body 4 and the sliding contact body 5 are provided in two places between the outer mast 6 and the inner mast 7 and between the inner mast 7 and the carriage 3. The structure is simplified, and the backlash of the carriage 2 can be directly suppressed from the outer mast 6 on the fixed side, so that the backlash suppression effect is greatly improved.
Since the sliding contact body 4 has a disk shape centered on the front-rear direction axis and is provided so as to be freely movable, the sliding contact body 4 rotates each time the sliding contact body 4 comes into contact with the sliding contact body 5. The different parts contact the slidable contact body 5, and uneven wear (so-called sliding) of the slidable contact body 4 and uneven elastic deterioration of the elastic body 19 are prevented.
Since the sliding contact body 5 has a sled plate shape, smooth sliding contact with the sliding contact body 4 is performed.

In this example, the sliding contact body 4 and the sliding contact body 5 are provided with the sliding contact body 4 on the carriage 3 and the sliding contact body 5 on the outer mast 6. The body 4 may be provided on the outer mast 6 and the slidable contact body 5 may be provided on the carriage 3.
In this example, the sliding contact body 4 and the sliding contact body 5 are disposed between the side portion of the outer mast 6 and the carriage 3. However, the present invention is not limited to this, and for example, between the front portion of the outer mast 6 and the carriage 3. You may arrange in.
In the previous example, the sliding contact body 5 is a dedicated separate member. However, the sliding contact body 5 is not limited thereto, and for example, the side surface or front surface of the outer mast 6, the center plate 14 of the carriage 3, or the like may be used.
The elastic body 19 is made of rubber in the previous example, but is not limited thereto, and may be, for example, a leaf spring or a disc spring.
In the previous example, the loose coupling means 21 used the headed pin 25 and the split pin 26. However, the present invention is not limited to this, and for example, a bolt and a nut may be used.

FIG. 3 is a side view showing the carriage backlash suppressing device of the present invention. The top view of FIG. The same figure as FIG. 1 which shows a no-load running posture. The longitudinal side view which expands and shows the principal part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Carriage backlash suppression apparatus, 2 ... Mast, 3 ... Carriage, 4 ... Sliding contact body, 5 ... Sliding contact body, 6 ... Outer mast, 7 ... Inner mast, 8 ... Frame material, 9 ... Connection material, 10 ... Frame 11 ... connecting material, 12 ... lift bracket, 13 ... finger bar, 14 ... center plate, 15 ... side plate, 16 ... projection, 17 ... fork, 18 ... hook, 19 ... elastic body, 20 ... mounting plate, 21 ... floating coupling means, 22 ... stepped hole, 23 ... through hole, 24 ... through hole, 25 ... headed pin, 26 ... split pin, 27 ... vertical piece, 28 ... warped piece, 29 ... mounting piece, 30 ... Bolt, 31 ... nut, A ... overlap.

Claims (3)

A mast, a carriage that can be moved up and down along the mast, a sliding contact that is elastically provided on one of the mast and the carriage via an elastic body, and a carriage that is provided on the other of the mast and the carriage. A sliding contact body that is slidably contacted with the sliding contact body in an unloaded traveling posture, and the sliding contact body has a disk shape centered on the front-rear direction axis and is provided so as to be freely movable by means of loose coupling means. A carriage backlash suppressing device characterized in that the slidable contact body has a sled plate shape including a vertical piece and upper and lower warped pieces .   The mast includes an outer mast and an inner mast that can be moved up and down along the outer mast. The sliding contact body is provided on the carriage, and the sliding contact body is provided on the outer mast. The carriage backlash suppressor as described. The loose coupling means includes a stepped hole formed at the center of the sliding contact body, a through hole formed at the center of the elastic body and continuing to the small diameter portion of the stepped hole, and the center of the mounting plate attached to the carriage. And a through hole that is continuous with the through hole, a head at one end and a split pin hole at the other end, and are inserted into the stepped hole, the through hole, and the through hole in a loosely fitted state, and the head is stepped. It has a headed pin that is accommodated so as not to protrude from the large diameter part of the attached hole, and a split pin that prevents the headed pin and the headed pin from coming off when the forked part is expanded by being inserted into the split pin hole. and which carriage backlash suppression device according to claim 1.

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