DE2212850A1 - Lift truck - Google Patents

Description

Patentenwatt · Patent Attorneys

Dr. phi !. Gerhard Henkel Dr. rer. nat. Wolf-Dieter Henkel

D-757 Baden-Baden Bellow Dl pi. -I ng. Ralf M. Kern

iJ? SS? «Sv ^Dr · ^rer · ^nat · Lothar Feiler

T * t «y-Adr'MfnoMMdM-tadMi 'D-O ΜϋΙΚΠΘΟ 90

Mnard-ldimkMtr. 2 - -j Τ · ».: (0811) W3197

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Mitsubishi Jukogyo
Kabushiki Kaisha
Tokyo, Japan

Lift truck. Ί 6th MAR. 1972

The invention relates to a lift truck for lifting and lowering air cargo and other types of cargo and goods via one appropriately selected upward and downward stroke for loading and unloading such goods on aircraft or other transport equipment or for the transport of goods in department stores, transshipment centers and similar facilities.

Most conventional lifters of this type use a system in which each support platform is arranged so that they have a circular or revolving movement including one performs vertical movement, with their slat chains are arranged bendable. As a result, these conventional Devices the support platforms may lose their horizontally balanced state during the lifting movement, what Instability of the goods placed on the platform and excessive loading of the slat chains. With these conventional systems are often devices, such as guide rails, used to the distance between front and to keep the rear end of each support platform constant; However, due to their mechanical complexity, such devices are

209840/0781

is still unsatisfactory for eliminating the shortcomings mentioned. In addition, a lift truck is known in which the upward stroke can expediently be changed during operation is that the angles of the parallelogram-like orbiting motion are changed; However, this system is liable for the lack of that in the case of a change in the stroke length, the position that the cargo assumes when loading or unloading the lift truck relative to the horizontal is canted. In addition, the lifting mechanism is quite large compared to the lifting capacity of the lift truck,

The object of the invention is to create an improved Lift truck, which is free from the mentioned and other defects of conventional devices, a long service life possesses and is able to carry out loading and unloading with high efficiency and great safety.

This task is performed with a lift truck with four pulls of endless chains, a carrier that is attached to its four corners by means of ball joints is carried by the associated, endless chain and a continuous movement along one of a lifting path and a return path is able to carry out existing cyclic movement path, and a drive device for producing the cyclical carrier movement is achieved according to the invention in that the carrier has a plurality of in its direction of movement has strips arranged next to one another and an articulated chain holding the strips, which consists of several gel plates consists, which the bars are able to hold in firm mutual connection that immediately before the wearer during its cyclic movement enters the lifting path, each one guided by a guide plate holding plate between the relevant Hinge plates is introduced when the carrier moves at the beginning of its stroke, freight or goods be applied to him, when the wearer his

209840 / Q7Ö1

Traverses the lifting distance, also performs a vertical movement and thereby under the effect of the between the loading, hinge plates engaging retaining plates retains its horizontal position when the wearer is at the end of his Approaching the lifting distance, the freight or goods leave it and, if the carrier leaves its lifting distance, itself runs through a convex curve outside the cyclic movement path and thereby opens the joint plates, so that the retaining plates displaced under the action of springs and withdrawn from the hinge plates, and that the goods lifting distance is adjustable by at least either an upper frame or a support base, which is the loading or the discharge end support the lifting distance, can be adjusted vertically, resulting from this adjustment sagging or shortening of the endless chains compensated for by a chain tensioning device can be, which is arranged at a point of the return path at which the engagement of the retaining plates with the hinge plates is canceled.

The following is a preferred embodiment of the invention explained in more detail on the basis of drawings · It shows

Fig. 1 is a diagrammatic representation of the general arrangement a lift truck with the features of the invention,

FIG. 2 is a representation similar to FIG. 1, which shows a working position of the lift truck,

5 is a perspective view showing the state of a Freight item on the one hand when loading onto a support "platform of the lift truck and, on the other hand, when unloading of her times,.

Fic · 4 an enlarged. Partial supervision held l-lauatab on the essential parts of the support platform,

209840/0761

^ß AD ORIGINAL

Pig, 4a, 4b and 4c each have a schematic section along the Line Λ-Α or B-B or C-G in Fig. 4 and

5 shows a plan view on an enlarged scale an embodiment in which the retaining plates are positioned between the relevant hinge plates via guide plates the support platform are inserted.

The mechanism of the lift truck according to the invention has two support platforms 200 which are each supported at their four corners by endless suspension chains 1 to 4, which in turn each have two connection points 17 and 18 for the corresponding support platform corners. Each connection point VJ, 18 consists of a ball-and-socket joint and enables the chains and support platforms to move smoothly without undue hindrance at these points in a manner to be described. The support platforms 200 are arranged in such a way that they are equidistant from one another on their trajectory along the suspension chains 1 to 4 and, in a manner to be explained below, enable the goods to be handled at practically the same intervals during the setting up and setting down process. The distance between the support platforms 200 can, however, be changed according to the particular application of the lift truck. The chains 1 and 2 are guided over chain wheels 5 to 10 and the chains 5 and 4 over chain wheels 11 to 16, these chain wheels 5 to Io are arranged in pairs opposite one another on this side and on the other side of the support platform. The sprockets ^ to 11 have a common drive shaft 2β, through which the driving force of a motor is transmitted to it 27, "* mi drive wool 26 through ce. Is driven i motor 27 causes cic a L'loichcclmellen UnIauf the chains 1 up to h and thus a ::; chalking movement of the platform platforms 200.

In this orbit, on which however Tra ^ plattforra 200 moves cyclically, that of don ljtttc-: ivL6oi :: i 8, lh Vur-.r dlo

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BATH ORIGINAL

Sprockets 9, 10, I5, 1β au don sprockets 5, 11 vsrlauf-. de section the " ^{lifting path 11} and dor from the chain wheels 5, 11 ubOi. · the chain wheels S, 7, 12, 13 to the chain wheels 0, 1.4 ■ running section represents the" return path ". When the chains 1 to 4 in In the direction of arrow E, the support platform 200 performs an upward movement on the lifting path and, if the side movement is in the opposite direction, a downward movement.

When goods are lifted with the aid of the illustrated lift truck, they are picked up and released according to FIGS. 3 and 2 in FIG Welsa, theB brought into the lift truck by means of a conveyor belt 37 Gutötüek 35 is placed on a support platform 200, which is just in the manner indicated by arrow P has run over the sprockets 8, 14. The support platform 200 then moves including the good piece 36 resting on it along the lifting path, maintaining a level position in a manner that will be described later, until their leading edge at the location of the sprockets 9 and at the same time its rear edge has arrived at the location of the sprockets 15, and is then according to Pig. 2 to the location of the sprockets 10 and 16 raised. The good piece 36 then leaves the support platform 200 again at the location of the sprockets 5 * H and is replaced by a Discharge conveyor belt 38 carried away. When lowering the goods, the operating process described above runs in reverse Sequence, with the goods being supplied by the conveyor belt 38 and conveyed away by the conveyor belt 37.

On a sole, for example a hall floor or the like, a support floor A is fastened by suitable means, which, depending on the type of lift truck, can be the machine base frame or a part thereof. On it are the sprockets 6, 8, 9, 12, 14,

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15 * the FUhrungsrollan 23, 2h _t 25 and still to be described guide rails 35 mounted in an unchangeable relative position, while for the displaceable axes of the chain wheels 7, 13 v / a horizontally extending guide slots 3 (Fi ^, 2) are provided in the support floor.

Furthermore, an upper frame B is mounted vertically adjustable on the support base A so that it can be brought to any desired height position with the aid of drive means (not shown). This Ilahtnen B carries the mentioned chain wheels 5, 11, 10, 16, the guide rollers 22 as well as the guide rails 34 to be described below, alloi the relative position. ¹ parts remain unchanged regardless of the pitch of the upper frame.

Probably, therefore, by changing the height position of the upper frame, the lifting height of the good pieces 36 *, for example can be adjusted from the position drawn in solid lines in FIG. 1 to the position shown in dash-dotted lines. Any Excess or short length of the suspension chains 1 to 4 as a result Such a lifting height adjustment of the good pieces 3 j can be done Actuate the chain tensioning device 300 so that it is balanced, Vienn, for example, the support platform 20 from its highest Lifting position is to be lowered, then a gear motor 33 is started to operate the chain wheels 7 and 13 with or without the aid of sprockets 3I and a synchronizing drive chain 32 to set two screw spindles 30 in rotation and thereby two are in engagement with her Lagerblüoke 29 # a shaft 28 carried by them and the chain wheels 7 and 13 mounted on the latter together in the support floor slot S from the orbit of the support platform 200 outwards, thereby lengthening the return path and thus eliminating the slack in chains 1 to 4. On the other hand, if the highest stroke of the tracplab form 200

209840/0781

BATH ORIGINAL

from the position shown in dash-dotted lines in FIG. 1 should be, then the Ivette clamping device is 500 operated in the opposite direction and thereby compensated for the short length of the suspension chains 1 to 4.

Each support platform 200 consists of a goods support plate arrangement 21 of the slat conveyor type and two connecting chains 20 holding the plates 59 to 45, which ^{couple the adjacent strips 21 1 so} that they can be rotated relative to one another by means of chain rollers 45, 48, bushings 46 and d chain pins 47, 49. As a result of this construction, the support platform 200 is normally able to bend forwards or backwards, but maintains it The lifting path runs through an upright planar configuration as a result of the engagement between the hinge plates 45 and, for example, cup-shaped retaining plates 44. When the support platform 200 runs into the lifting path Gin, it moves over the guide rollers 25, at the location of which two guide rails 55 are provided, through which each holding plate kh between di e adjoining, fan-like opened articulation plate 45 of the support platform 200 is introduced. Connect c. The joint plates 45 are then kept closed over the entire lifting distance and thus remain in engagement with the Ilalteplatt-n 44. The wear resistance can be improved by increasing the contact surfaces between the two plates when they are in mutual engagement.

According to Fig. ^ "Is in each holding plate 44 one end of a support shaft ^r <: _ eiiigeachrurapft, which is in a bearing 54 in the general

x in the position drawn in full

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BUILDING

steering plate 39 is mounted, which in turn has a connection χ of the plate assembly 21 of the support platform. At the other end of the shaft 50 is a sleeve by means of an adjusting screw 52 attached »As can be seen, there is also one of the shafts 50 load-bearing and holding device 53 with the aid of screw bolts embedded in the plate assembly 21 and anchored in it, while between the holding device 55 and the sleeve 52 'a spring 5I is inserted, which the retaining plate 44 to be constantly pulled out of the area between the hinge plates 43 seeks. After leaving the lifting path, the support platform 200 runs over the guide rollers 22, at the location of which open the hinge plates 4j5 again like a fan so that the Retaining plates 44 disengaged under the action of spring 5I get with them and move into the position 44 '* whereupon the support platform 200 along its return path freely forward or is thermally bendable at the back.

Chain rollers are located on the two end sections of the support platform 200 48 and chain pins 49 are provided, which with the Support shaft connected joint plates 42 support, polygamy on both sides the support platform 200 protrude and carried by the suspension chains 3, 4 and 1, 2 at the support points I7 and l8 will. At the point at which each of these joint plates 42 intersects the suspension chain 4, a bracket joint I9 is provided, on which the chain 4 according to Flg. 4b of the hinge plate 42 evades. The same applies to the suspension chain 3. If the Chains 1 to 4 revolve against arrow E, then through the guide rails arranged next to the guide rollers »22 a mutual engagement of the retaining plates 4 * 1 and the hinge plates 43 causes the planar configuration of the support platform 200 is maintained, roll at the location of the guide 25 but is canceled again »It is :: u note, rtcus jode Retaining plate 44 a. · -.) End edge 55 has a white, which is a;

χ for attachment

- ■ O _

2 0 9 e A 0/0 7 8 1

Removal of the engagement between the "retaining plates 44 and the Hinge plates 45 prevented.

The above-described, inventive lift truck thus enables the continuous upward conveyance of goods between suitable selected transfer points, with each support platform executing a smooth circulating movement and always keeping the items resting on it in a stable position. I) The retaining plates are light in weight, work uniformly and inevitably and are highly reliable in operation. In addition, they can be easily replaced or repaired. Furthermore, both the goods conveyor track and the installation space for the machinery and other accessories are subject to only minor size restrictions.In addition, the arrangement can be made in such a way that the horizontal distance between the Öüter transfer points remains unaffected by changes in the lifting distance. Furthermore, the suspension chains can be adjusted with the aid of devices which are adapted to the construction conditions of the entire lift truck.

- 10 -

209840/0781

Claims (1)

- ίο -, .3 Mitsubishi Jukogyo
KabUshiki Kaisha
Tokyo, Japan Claim Lifting loader with four trains of endless chains, a carrier that is carried on its four Eoken by means of ball joints by the associated, endless chain and is able to carry out a continuous movement along a cyclical movement path consisting of a jacking path and a return path, and a drive device for producing the cyclical Carrier movement, characterized in that the carrier (200) has a plurality of strips (21 ¹ ) arranged next to one another in its direction of movement and an articulated chain (20) which holds the strips and consists of several joint plates (4; 5) which the strips in able to hold firm mutual connection that immediately before the carrier enters the lifting path during "its cyclical movement, a holding plate (44) guided by a guide plate is inserted between the relevant joint plates when the carrier is at the beginning of its lifting path moves, freight or goods ν are applied to him, then, when the carrier runs through its stroke length, also performs a vertical movement and thereby maintains its horizontal position under the action of the retaining plates engaging between the joint plates in question, then, when the carrier approaches the end of its stroke length, him leave the freight or goods, and, - 11 - 209 8 40/0781 _0RlGINA t, nspected when the carrier leaves its stroke distance, even a convex curve outside the cyclic movement path runs through and thereby opens the hinge plates so that the retaining plates are displaced under the action of springs (5I) and withdrawn from the hinge plates, and that the goods lifting distance is adjustable by at least either an upper frame (B) or a shelf (A), which is the feed or, "the discharge end of the Support the lifting distance, can be adjusted vertically, resulting in slack or shortening from this adjustment of the endless chains through a chain saving device (500) that can be compensated at one point of the Return path is arranged at which the engagement the retaining plates with the hinge plates is canceled. 2098A0 / 0781