DE1481169A1 - Loader with scissor gear for advancing and retracting a load carrier - Google Patents

Description

Eaton YaIe & Towne Inc., Cleveland, Ohio / USA

¹¹ lifters with shear narrow drives for advancing and retracting a load carrier "

The invention is directed to a lift truck with a Seerenmeehanismus for advancing and withdrawing a plate carrying a load fork, |) the plate becomes relative advanced and withdrawn to a base member, which forms a 2-part of a lifting carriage and upwards and is moved downwards along the mast rails.

With mechanisms of this type, it is highly desirable that the visibility for the driver is as little as possible to be affected by the link forming the scissor gear. When the seerenra mechanism is wide When using handlebars, visibility is significantly impaired, as is obvious to a specialist.

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Furthermore, it is very important that the movement of the load fork is as large as possible, using the shortest possible handlebars as part of the scissor mechanism. A number of suggestions have already been made for an ever greater range of motion with always To achieve shorter handlebars, as set out in U.S. Patent 3,082,694, for example.

The invention solves the problem described above first by a new type of storage of the handlebars Scissor mechanism, with an excellent bearing relationship between the handlebars using easier Plates to form the handlebars is achieved. Here you can form one of the handlebars from two united parts, one on each side of the other link, these being articulated relative to the other link.

To achieve the greatest possible range of motion you make the arrangement such that the joints or other bearings between the links and the usual Move the fork carriage plate backwards relative to the points at which the handlebars on the base plate or the lifting carriage are attached. In other words, the actuation points of the fork carrier plate are to the rear the support points of the handlebars on the lifting carriage when the load fork plate is in the retracted position.

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In a further development of the invention you can use the carrier for Attach the load fork to a bearing member which is preferably slidably mounted on a Soitenverschiehungspresse is. Then the fork carriage can be moved sideways by actuating this press. The fork carriage, can. rait the bearing link from one piece. If the Fork carrier is correspondingly getx'agen from the press cylinder, -can this continues to rotate around the axis of the cylinder to pivot the fork. This pivoting can through Presses are effected, the actuating ends of which grip against the fork carriage when it is shifted *

Furthermore, the actuating presses for the Seherenmeehami-sffiius between one of the handlebars and the moving member lie. This arrangement is very advantageous, because then an "open space" remains at the Huhschlxtten, which helps to improve visibility.

Further features and details / of the invention are below with the help of the drawing, for example. purifies ·. This shows in,

Pig. 1 is a side view of a conventional lift truck

with a scissor gear according to the invention,

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2 is a partially sectioned side view showing the scissors mechanism according to the invention in the retracted position ₉

FIG. 3 is a view similar to FIG. 2, but with the Swivel press for. Pivoting of the fork has been actuated,

Fig. 4 a F.ig. 2 and 3 similar view, the Scissor links have been operated to advance the support member and the fork in unswiveled and in rswiveled position is reproduced,

Fig. 5 is a partially sectioned view parallel to the mast rails of the '' Vehicle, which the arrangement of the scissor links to each other and to the base plate and to ! Supporting member reproduces,

6 shows a top view of the device according to FIG. 2,

7 shows a section along line 7-7 in FIG. 4 and in

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Figure 8 is an exploded perspective view the device according to the invention.

A conventional lift truck 10 has first uprights 11 which are fixed to the vehicle or hinged at the lower end of the same. Furthermore, second stand 12 are provided on can best be seen in Figures 2 and 5. These can move vertically to the first uprights in the usual way.

A base plate 13 has a pair of main side plates 14, each of which has an upper roller 15 and a lower one Role 16 owns. These rollers slide in the grooves of the second stand, so that the base plate 13 moves upwards and downward relative to and together with the second uprights can move the second stand relative to the first stand »

A support member has a pair of side plates 17a and 17b, which are preferably used for the purpose of executing a common Movement by suitable cross-connecting members 17d and 1? Ο are connected to one another. A hydraulic one Press cylinder 18 is at both ends with the side plates 17a and 17b connected. The piston 19 of this hydraulic side shift press slides relative to the plates 17 of the support member and relative to the cylinder 18. The piston 19 extends outward on both sides of the press 18 and is at its ends 20 on a load carrier

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attached. This load carrier 21 can load fork tines 22

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wear over parts 23, which with an edge 24 of the carrier

21 interact. Jier Tiäger 21 is slidable on the Outer surface of the cylinder 18 by a bearing housing 21a which is attached to the carrier 21.

The piston 19 is provided with a piston head 25, such as Figure 8 shows, which is located inside the press cylinder by supplying a pressure medium at 26 or 27 under the exit moved by pressure medium from the respective opposite opening 26 or 27. When the page shift press is actuated, the carrier bearing housing 21a is moved relative to the press cylinder 18 and thus the load carrier laterally relative to the support member. This causes a lateral shift of the load carrier 21 and the fork tines

22 causes, for which a large number of older proposals has already become known * However, the person skilled in the art will recognize that the movement of a load carrier on and relative to a press cylinder is particularly valuable in connection with the load handling combination that has been described above and explained in more detail below will ο

Returning to the main side plates 14 and the side plates 17 of the support member, let us consider the scissor mechanism, which connects these plates with each other, described, with only the scissor links on a " Side of the vehicle. True, there are two couples There is a scissor link, as these are, however,

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speak, their construction will as far as possible under Use of the singular is described-; as this is in relation to the arrangement of the drawings seems more appropriate.

As FIG. 8 in particular shows, one link of each link pair is denoted by 30. The upper end of this handlebar carries a roller 31 which runs in a slot 32 of the main side plate 14. The lower end of the link 30 is ^{hinged at 33 9} ^ - its vertical plate 17. As

30 best "Pig. 5 shows, the handlebar has a central part 34-, an offset upper part 35 and an offset lower part 36. Because of this particular arrangement, it can be seen that the lower end 36 lies in a plane, the lateral distance that of the upper end 35 with the roller 31 has o As a result, the lower end 6 can pass the plate 14 and move from the advanced position according to FIGS. 4 and 8 into the retracted position according to FIGS. 2 and 3.

The other link 30a of the scissor link mechanism is off formed two parts, one of which is designated by 40 and the other by 41 "$ ie the two handlebar parts 40 and 41 are united with one another and with a bearing 42 in a certain way

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7 and 8 that the handlebar 30 has a bearing opening 43, in which the bearing 42 fits. Each of the handlebar parts 40 and 41; is provided with a Heine of openings 44, which with Openings 45 of the bearing 42 are aligned. By using bolts 46, the handlebar parts 40, 41 can be connected to one another and be united with the handlebar 30. This brings the handlebar part 41 to one side of the handlebar 30 and the handlebar part 40 to the other side of the handlebar 30. This also makes the two handlebar parts 40 and 41 very effective rotatably mounted in the handlebar 30, although the handlebar is formed from relatively thin metal, the bearing opening 43 is arranged within the handlebar part 34. The location of the two link parts 40, 41 on each side of the Handlebar 30 provides an effective hold against torsion of the bearing 42, the bearing 42 naturally being the handlebar parts 40, 41 connects with each other »As in particular figure 5 shows, the handlebar part 41 is relative to the handlebar part 40 in exactly the same way as the handlebar parts 35 and 35 of the handlebar 30 offset This allows to arrange a roller 48a at the upper end of the handlebar part 41, which in a Slideway 47 of the plate 17 is movable, while the lower link part 40 is articulated at 48 on the plate 14 »Figure shows that the various parts of the handlebar can pass each other. So are the top ends of the one-piece Handlebar 30 and the double handlebar 30a relative to each other offset so that they can pass each other in any direction of movement without hindrance. It can be seen that

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the lower ends also facing each other in each direction can happen without hindrance. Because of this is it is possible to achieve a full advancement and retraction of the support member formed by the plates 17. This is particularly evident when studying Figures -2, 3 and 4 »In Figure 4, the plates 17 of the Support or support member shown in the advanced position relative to the base plate, as a result of the actuation of the scissors mechanism. In Figures 2 and 3, the support plates are in the fully retracted position reproduced, and it can be seen that the joint 33 is located rearward of the joint 48 in this position. In other words, as a result of this offset position, the joint 33 cannot only be in an opposite position to the link 40 Position, but also get into a position on the rear side of the base plate 14. This means, that the scissor links have a greater path of movement than the handlebars of a conventional scissor mechanism, since the path of movement can begin from a more retracted position. It should also be noted with respect to Figures 2 and 3 that the rollers 48a at the upper ends of the handlebar parts 41 are rearward of the rollers 31 are in correspondence with the teachings explained above.

From the above, it follows that, due to the design according to the invention, not only handlebars made of plate

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shaped material in order to achieve extremely good visibility are usable, but that the individual parts can also pass one another in such a way that an extremely large movement path is achieved.

According to the invention, there is also a novel press arrangement proposed to effect the movement of the support link plates 17-17 relative to the base plates 14-14 » For this purpose, each link 30 is provided with a stop member which carries a joint 50 on which the piston 51 a press 52 is articulated at 53 on a plate 17 hinged, of course two presses 52 are provided ^ one for each of the plates 17.

By extending and retracting the presses 52 moves the handlebars to advance and retract the support member. By placing the presses between the support member and the scissor links a very good result is achieved. So there is not just one movement of the support plates 17 achieved, but this is made possible without loading the base member 13 and its side plates 14. As as is clear to those skilled in the art, the attachment of presses to the base plate or any part thereof constitutes a considerable one Problem especially as it would be difficult to operate the handlebars without moving the To affect the support member in the shown in Figures 2 and 3, closely nested position.

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Since the cylinder 18 working in the bearing housing 21a is cylindrical, the bearing housing can not only relative to. Cylinder 18 slide, but also rotate, which can be used to generate a rotational movement of the load carrier 21, as best from the Figures 2, 3, 4 and 8 can be seen. The load carrier 21 thus has a part 60 which, relative to a ball 61 at the end 31 of a pivot piston 62 slides. There are two Presses and two press pistons 62 are provided, each one at the bottom of each plate 17. Since the bearing 21 engages against the ball 61 of each press piston 62 in all positions, it is only necessary to extend the plunger 62 in order to allow the load carrier to pivot about the axis of the To effect press cylinder 18 and housing 21a.

Claims;

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Claims (7)

Patent claims: 1. Lift truck with vertically movable along a lift mast Lifting carriage with a base member, between which and a support member for a load carrier on both sides a pair of scissor links is articulated or slidably guided, characterized in that a link (30) of each pair of scissor links (30,3Oa) between its ends with a bearing opening (43) is provided in which a bearing member (42) is rotatably mounted, on which one on each side Part (40 and 41) of the two-part other scissor arm (30a) is releasably attached. 2. A lift truck according to claim 1, characterized in that the scissor link (30,3Oa) from relativ.dünnem plate-shaped metallic material are formed. 3 «lift truck according to claim 1 or 2, characterized in that that the scissor link (30) having the bearing opening (43) is bent in such a way that that one of its ends is offset laterally relative to the bearing opening in one direction, while the the other end is laterally offset relative to the bearing opening in the opposite direction. 9804/0 8 84 -K- 4 · A lift truck according to claim 1 or one of the following, characterized in that the articulation (33) or Bearing points (48a) between the arm (30,30a) and the load carrier (21,22) supporting Support member (17) in the retracted position of the load carrier behind the articulation (48) or bearing points (31) lie between the scissor links and the base member (13) or the lifting carriage. 5. A lift truck according to claim 1 or one of the following., ^{Characterized by a between a scissor arm (30) of each S u} herenlenkerpaares and the support member (17) arranged by this hydraulic press (52) for actuating the scissor gear. 6 »lift truck according to claim 1 or one of the following, characterized in that the load carrier (21,22) is supported relative to the advanceable by means of the scissors mechanism _(30? 30) support member (17) transversely displaceable and pivotable. 7. A lift truck according to claim 6, characterized by a hydraulic press (18, 19) fastened _{to the T r member (17).} with the piston (19) of the load carrier (21) is connected, the load carrier by means of a 900804/0804