DE1781422A1 - TILT SLIDE MECHANISM FOR LIFT LOADER - Google Patents

Description

The Knickerbocker Oo. '. Separate registration from

A * 1? 81 048. ^ - 22

■ T _B Qk _H on fe

AUGUST 17

Ί78Η22

Tilting slide mechanism for lifters

The present application relates to a tilt slide mechanism for a lift truck.

The object on which the invention is based is therein seen to create an improved tilt slide mechanism for lift trucks that is carried by the lift slide Load swivels substantially around the center of gravity of the load, whereby the operation of the tiltable load carrier or Lifting slide required force is reduced and the space required and the structural complexity of the lifting slide be reduced.

This object is achieved according to the invention in that at least one upright tie rod secured against tilting articulated over two vertically at a distance from each other lever mounted on the pull rod with an ochutzpla «, te is articulated, with the »protective plate, which

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is designed to accommodate load-bearing boom assemblies, at a distance from the tie rod or rods is arranged and connected to the levers in such a way that their Schutzplattenenseitxger distance is smaller than their is the drawbar-side distance, and that a lifting cylinder for tilting the protective plate relative to the drawbar or the tie rods operatively connected to the guard plate, levers and tie rod or rods is.

It has proven to be particularly favorable if the protective plates are arranged upright in their only minimal position is. The lifting cylinder is expediently pivotably connected to the tie rods and the protective plate. Of the Lifting cylinder is preferably at one end next to the connection of one of the levers with the pull rod or the Articulated tie rods, while its other end is articulated to a crank arm extending from the Protective plate extends in the direction of the tie rod or rods.

According to a particularly preferred embodiment are two tie rods in the topmost extending mast by means of two rollers in two guide grooves of two upright Rails run parallel to these, with the protective plate running across the rails and by the levers

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is worn with the protective plate at coaxially aligned first points and at coaxially aligned second points, which are perpendicularly spaced from the first points, are pivotally connected. It is special advantageous if two lifting cylinders at one of their ends, each with one of the tie rods next to the first levers are pivotally connected, while their other ends with two of the protective plate towards the tie rods protruding crank arms are articulated, wherein the lifting cylinder can be acted upon by a pressure medium are, because their actuation is simultaneous and synchronous to each other. Each of the tie rods expediently has a first axis next to its upper end and a second axis next to its lower end, on each of which one of the levers and one of the rollers is rotatably mounted are.

It has also proven to be beneficial to use the guide grooves to turn outwards on both sides and the lifting cylinders between the associated tie rods and rails in the channel to arrange the corresponding rails for the purpose of vibration limitation within the limits of the guide grooves.

The tilt slide mechanism for a lift truck according to the invention provides an economical and efficient arrangement to change the position of the load-bearing boom

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arrangements, such as forks or other additional devices, which of the Protective plate to be worn. The mast of the lift truck does not have to be relative from its fixed setting to the vehicle on which it is arranged, be tilted, so that the workability of one with a conventional Tilt mast provided vehicle is retained without its many disadvantages are accepted have to. As a result of the generally vertical alignment and the limiting swing movement of the lifting cylinders these can be pushed inwards from the tie rods in a space-saving manner into the guide grooves of the rails be, whereby the width of the mast can be reduced. Since the mast is in its rest position normally located between the front tires of the lift truck, this allows the overall width to be reduced of the mast at the same time reducing the overall width of the lift truck, which means working in narrow aisles and confined spaces Storage rooms are facilitated.

Since the use of the tilt slide mechanism according to the invention a tiltable arrangement of the mast on the vehicle is not necessary for a lift truck, the position the load on the lifting carriage cannot be moved from the center of the vehicle. This increases the stability

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of the mast and the vehicle and the performance of the mast increased compared to a tilting mast. Furthermore, since the mast does not have to be pivoted to tilt the load, are Inertial forces that exert a slinging effect on the mast are considerably reduced.

The accompanying drawing of a specific embodiment serves to further explain the invention. Show in it:

Fig. 1 is a side view of a lift truck,

the one with the tilt slide mechanism according to the invention is provided, in a position in which the lifting carriage and the mast assumed the maximum lifting position to have;

2 shows a front partial view of the lower part of the mast in its retracted position, from which the special design of the tilting slide mechanism ¹ can be seen;

Fig. $ Is a side view of the arrangement shown in Fig. 2 on an enlarged scale;

Figure 4 is a horizontal section along line 21-21 of Figure 3;

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Fig. 5 is a view of the mast with the tilt slide mechanism from the opposite of the illustration of FIG. 3 Side with the mast fully retracted to illustrate an arrangement for the supply lines of a pressure medium to the reciprocating pistons of the tilting slide mechanism;

ig. 6 is a partial vertical view taken along line 7-7 of S ¹ Ig. 5 on an enlarged scale;

Fig. 7 is a side view of the invention Tilting slide mechanism similar to that of FIG. 3, from which the position of the individual parts can be seen when performing tipping operations.

The description of the tilt slide mechanism according to the invention is based on an application of the same for a lift truck as shown in FIG. This special lift truck, in which the Lifting mast is not provided, is described in detail in German patent application P 17 81 048.9-22. In the following, therefore, the details of this arrangement are only dealt with insofar as this is necessary for the explanation the operation of the tilt slide mechanism is useful.

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The lifting mast 30 is arranged vertically at the front of the carriage 32 of the lift truck. The lift mast is shown in its extended position to the full lift height. The lifting mast JO contains a standing mast 34, which consists of two double rails 351 35 'and is fastened to the lower end of the vehicle 32 via the pins 36. At its upper end, the standing mast 34 is rigidly connected to the vehicle via fixed retaining arms 68, 68 'and an overhead frame 38. The overhead frame 38 also serves as a safety protection device for the operator of the forklift. In the rails 35 * 35 'cLes standing mast 34, a lifting cylinder 44 is arranged in such a way that the cylinder 56 is guided on its outside in a longitudinally displaceable manner therein. ITig. 1 shows it in its maximally raised position. The lifting cylinder 44 carries at the front end of the lifting piston 60 shown in the maximum lift position in FIG. 1, an extendable mast 4-0, which is also shown in its maximum extendable position. The extending mast 4-0 consists of two parallel rails 54, 54 'which are connected to one another and which have guide grooves 52, 52' which are open to the outside. The rails 54-, 54 · 'are connected at their lower end by a plate 100. At the upper end of the rails 54, 54 'and thus at the uppermost end of the extension mast, arms 64-, 64' are attached, which form a load torque compensation arm.

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In the guide grooves 52, 52 ', a lifting carriage 42 is guided, which consists of an essentially vertical protective plate 50, in which load-bearing Αμε-lay arrangements, such as fork prongs 66 are received. The lifting slide 42 is designed in the manner of the tilting slide mechanism ¹ according to the invention.

The construction of the mast is essentially symmetrical to one extending longitudinally through the vehicle Level built. The parts corresponding to one another with regard to this practice are each given the same reference numerals referred to, but the left of this and can be seen from the side view of FIG '! rushes are given an apostrophe.

The extension mast is displaced by means of two sets of lifting chains 62, 62 'and 58, 58', the jack chains 5ö, 58 'via the holding arms 68, 68' and 64, 64 * are guided around appropriate pulleys and cause the displacement of the lifting carriage 42.

The structural details of the tilt slide mechanism according to the invention are taken from the i'ig. 2-6 can be seen. Its mode of action is based in particular on Pig. 7 emerges.

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The lifting slide 42 is in the outwardly open i'ührungsnuten 52, 52 'of the rails 54, 54' guided by means of rollers 46, 46 ^f and 48, 48 ·. The lifting carriage 42 can thereby be displaced vertically in the extending mast 40.

As can be seen in particular from FIGS. 3 and 5, the lifting carriage 42 has two tie rods 266 and 266 'which are carried by the lifting chains 58, 58'. The lifting chains 58, 58 'are fastened to the tie rods 266, 266' here via connections 89, S9 ^1, which at the tie rods 266 and 266 'projecting arms 264, 264 · attack. the tie rods 266 and 266' extend perpendicularly adjacent to the outer side of the associated rails 54 and 5 ^ '. the rollers 46 and 48 of the lift carriage are journals 290 and 292, respectively, which extend through and are attached to the upper and lower ends, respectively, of the tie rod 266. Upper and lower levers 294 and 296 have their rear ends on the pins 290 and 292 292 is pivotally mounted between the tie rod and the pulley. Levers 294 and 296 extend forwardly converging toward one another as viewed from the mast. The front ends of levers 294 and 296 extend to two perpendicularly spaced apart Pins 298 and $ 00 and are pivotably mounted in these. Pins 298 and 300 are

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between two vertical sheets 302 and 304 arranged. The panels 502 and 304 form part of the rear Protective plate 50 of the lifting carriage 4-2. they are separated from one another by spacers 306 and 308 and welded in recesses of an upper and lower guard plate rail 310 and 312, the end faces the guard plate rails 310 and 312 with the * Front surfaces of platinum 302 and 304 are aligned. the left, shown in Fig. 5 slide side has ent-. speaking parts 290 'to 308'.

The top edge of the guard plate rail 310 has a series of cuts 314 that form the top hook ends 3I6 (see Fig. 3) of L-shaped bent forks 66 detachable. The upright back sides 318 of forks 66 rest on guard plate rails 310 and 312 to provide support for those protruding forward Prongs of the forks 66 to form. In a corresponding manner, others can also discharge to the front Load lifting accessories are attached to the lifting carriage 42.

The lifting carriage 42 contains two hydraulic lifting cylinders 322 and 322 '. These are each on the tie rods

the 266 and 266 'are arranged inside so that they are in between

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the relevant tie rods and the i'uhrungsnuten 52, 52 ^! of the associated rails 34, 5 ^ ¹ available are hardly pivotable (see i? 'ig. 3 and 7) The lifting cylinder 322 contains a cylinder 324, which is arranged at its upper end on a pin 326 so that it can be pivoted. The pin 326 is attached to the pull rod 266 directly below the lever 294. The lift cylinder 324 includes a lift piston 328 which is hydraulically reciprocable within the cylinder 324 and extends in the lower end of the lift cylinder. The lower end of the reciprocating piston 328 is pivotally connected by means of a pin 33G to a block 332 which is attached to a crank arm 33 ^. The front end of the crank arm 334 is connected to the protective plate 50 via the plate 304 and the spacer 308. A lifting cylinder 322 'is arranged in a corresponding manner between the pull rod 266' and the bchutzola ^ cce 50.

The lifting cylinders 322, 322 'are double-acting conventional punches ^{which are fed with a pressure medium from a gemeiu.sane: i Ströinuiigsmittel-Gelle through hose lines 33 1} ^ ₅ 336' ^ d 338 and 33S '. The hose lines are connected to the Z-supply and discharge lines 340 and 342, as in I''ig. 2, the lines 34ü and 342 are connected by a clamp 346

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(see Fig. 5) on the outside of the pull rod 266 ' clamped. They then extend upwardly over a disc 348 (see FIGS. 5 and 6) which is attached to a Pin 350 of a housing 352 is mounted. The housing 352 is mounted on a spring 358 and a pin 356 carried by a bracket 354 attached to a plate 176 ' is. The plate 176 'is attached to the arm 64' of the upper extendable mast. Lines 340 and 342 extend then down to a double disk 360 carried by a bearing 362 which is suitably positioned on cylinder 56 of lift cylinder 44 for extension of the mast is attached next to its lower end. Lines 340 and 342 then extend upward to a connector 364 according to FIG. 5 and then back down to the vehicle 32 or to a connection with a pressure medium source, a suitable hydraulic control device being provided, which is operated by the operator to control the tilting movement of the boy carriage 42 can be operated independently of the lifting of the load on the mast is.

The lift cylinders 322 and 322 'are controlled so that they work identically and at the same time and can extend or retract their reciprocating pistons 328, 328 'accordingly, so that a corresponding pivoting of the tilting slide

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mechanism ¹ takes place. The tilting slide mechanism here again acts like a linkage with four rods, as a result of which four prongs 320, $ 20 'are subjected to a tilting movement, as can be seen from FIG. In Fig. one tilt position is shown with solid lines, the other with broken lines. In the following, only the mode of operation of the right linkage is explained, since the same statements also apply to the left linkage. The drawbar 266 acts as a fixed link of the four-bar linkage because it is anchored by rollers 46 and 48 which run in the guide grooves 52. In order to bring the forks 66 into their outermost downwardly tilted position, as shown in FIG. 7 with dashed lines, the lifting cylinder 322 is actuated in order to move the lifting piston 328 in the lifting cylinder 324 upwards. As a result, a clockwise moment is exerted on the protective plate 50 via the crank arm 334, the levers 296 and 294 rotating upwards or counterclockwise, as can be seen from FIGS. 3 and 7. In order to tilt the forks 66 in the opposite direction, that is to say in the position shown in FIG. 7 with solid lines, the lifting cylinder 322 is actuated in the opposite seal. As a result, the reciprocating piston 328 is driven downwards, so that a moment counterclockwise

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sense the protective plate 50 via the crank arm 334 is exercised.

It should also be noted that the guard plate 50 forms the shorter of the two "long links" of the four-bar linkage. This brings the center of the pivoting movement of the load outside of the linkage to the intersection "P" of the straight lines 370 and 372 (see fig. 7), which represent the perpendiculars from the same point on the protective plate in the two tilted positions. The load pivot point is therefore at point "P". The arrangement is chosen so that the point "P" is preferably adjacent to or coincides with the center of gravity of the average load to be borne by the forks 66. The tilting movement imparted to the forks 66 will therefore neither raise nor lower the load, but rather pivot it about its center of gravity. Because of this feature, small lifting cylinders 322, 322 'are sufficient to pivot the slide, since they only have to overcome the frictional resistance of the slide parts. The four-bar linkage also allows a lift cylinder 322 to be used with a relatively short stroke to achieve a relatively large angular range of carriage movement. These savings in turn lead to other savings in terms of construction, particularly in terms of the stress on the vehicle pump and power source.

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In the aforementioned training aes KiopschlittenmecLanisinus ^r it is achieved that ^. the upper and lower ends of the protective plate 5 ^ move in the opposite direction to the tilting of the forks. The distance between the lifting mast and the protective plate is thereby reduced for a given range of the tilting movement, so that the L & stiaoEientaris is also reduced. The four-bar tilting rod of the Huoschlittens 42 also enables the guide rollers for the lifting carriage to be arranged vertically at a distance that is greater than the height of the protective plate ^ 0. The bending load caused by the forks along the rails of the extendable mast 4-U can thereby be better distributed. Although other articulated connections of the lifting cylinders 322, 322 'can also be used, such as a direct connection between the pull rod 266 and aer ochucz plate 250, the arrangement of the crank arm 35 ^ enables the connection of the rub cylinder 322 with the protective plate 50ϊ Q-oiss < The lift cylinder maintains its preferred vertical orientation while acting between the two long links of the four-tab linkage. As a result, a force multiplication for the lifting cylinders 322, 322 'is achieved.

The use of the fiction, contemporary kipp scr; suffered

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Mechanism 42 on lift mast 30 helps improve the performance of lift truck 32 in many ways. Thanks to the use of the tilting slide mechanism ¹ , the lifting mast 30 does not have to be tiltably arranged on the vehicle, so that the position of the load on the lifting slide 42 does not have to be shifted from the center of the vehicle. This increases the stability of the mast and the vehicle as well as the performance of the mast compared to a tiltable mast. Furthermore, since the lifting mast 30 does not have to be pivoted to tilt the load, the inertial forces which cause the mast to be thrown are considerably reduced. The combination of the tiltable lifting carriage 42 with the non-tiltable lifting mast 30 also allows the lower holding arms 68 for aligning the lifting chain to be immovably attached or anchored to the vehicle next to their outer ends, which in turn allows them to be received in the overhead protective frame 38, whereby the standing mast 34 can be relieved of the bending load transmitted to the arms 68, 68 'and a significantly increased lateral support for the lifting mast is achieved. The mast and the vehicle can therefore operate with a much larger side tilt angle.

Since a minimum of load-bearing structure is set in motion when the load is tipped, you can

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those generated and raised by the tilting movement of the load inertial forces acting on the support unit are practically eliminated. Also the bending load on the lift mast is overhead from the frame 38 directly to the Counterweight area of the vehicle 32 and not transmitted via the load anchorage and the vehicle frame. Therefore less dead weight material is required for the vehicle frame. The combination of the tilt slide mechanism with the rigidly attached lifting mast leads to one increased mast and vehicle performance at a reduced cost without sacrificing the versatility, safety and the usefulness of the way of working is impaired.

A use of the tilt slide mechanism according to the invention, which is based on the accompanying drawing has been described for a special embodiment of a lift truck with a non-pivoting mast, is of course also possible with other lifters and other types of mast constructions.

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Claims (8)

1 * 178H22 claims 1. tilt slide mechanism for lifters, characterized in that at least one Upright pull rod (266, 266 ') secured against tilting over, two vertically at a distance from each other articulated levers (294, 296; 29 ^ ', 296') hinged to a protective plate (50) is, wherein the protective plate (50), which is designed to accommodate load-bearing boom assemblies is, is arranged at a distance from the tie rod or rods and is connected to the levers in such a way is that their guard plate-side distance is smaller than their tie rod-side distance, and that a lifting cylinder (322) for tilting the protective plate (50) relative to the tie rod or the tie rods is operatively connected to the guard plate, levers and tie rod or rods. 2. tilting slide mechanism according to claim 1, characterized in that the protective plate (50) is arranged upright in its normal position. 3. tilting slide mechanism according to claim 1 or 2, characterized in that the Lift cylinder (322) with the drawbar or drawbars 309842/0019 (266, 266 ') and the protective plate (50) are pivotable connected is. 4. Ki-ppschlitten Mechanism according to claim 3> characterized in that the jack cylinder (532) at one end next to the connection of one of the levers (294-, 294- ') to the pull rod or - Tie rods (266, 266 ') is articulated, while its other end is articulated to a crank arm (334-) which extends from the protective plate (50) towards the tie rod or rods . 5- tilt slide mechanism according to one or more of the preceding claims, characterized in that two tie rods (266, 266 ') in the uppermost extendable mast (4ü) each by means of two lobes (46, 48; 46', 48 ') in two guide grooves (52, 52 ') of two upright rails (54-, 54-') are guided parallel to these, and that the protective plate (50) runs transversely to the rails (54-, 54- ') and is supported by the levers (294-, 296; 294 ', 296 ¹ ), which are pivotally connected to the protective plate at coaxially aligned first points and at coaxially aligned second points which are perpendicularly spaced from the first points. 309842/0019 _B AD 20 178U22 6. tilting slide mechanism according to claim 5 _5, characterized in that two lifting cylinders (322, 322 ') are pivotably connected at one of their .Ends with one of the tie rods (266, 266') next to the first levers (294, 294- '), while their other ends are articulated to two crank arms (334 ·, 334- ') projecting from the protective plate (50) in the direction of the tie rods, and that the lifting cylinders "(322, 322 ') can be acted upon with a pressure medium in this way are that their actuation takes place simultaneously and synchronously with one another. 7. tilt slide mechanism according to claim 6, characterized in that each of the tie rods (266, 266 ') a first axis (290) next to its upper end, and a second axis (292) next to its has lower end at which one of the levers (294-, 294 · 'or 296, 296') and one of the rollers (46, 4-6 * or 4-8, 4-8 ') rotatably mounted Bind. 8. tilt slide mechanism according to claim 7> characterized in that the guide grooves (52, 52 ') are turned outwards on both sides, and that the lifting cylinders (322, 322 ') between the associated tie rods and rails in the channel of the corresponding rails to limit vibrations are arranged within the limits of the I ^ ührungsnuten are. 309842/0019 BATH