DE1974573U - HYDRAULIC PRESS FOR LIFT LOADER. - Google Patents

Description

RA.567173-U167

DIPL.-ING. MEINKE 46 DORTMUND, the

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PATENT ADVERTISER phone 35sio private 4

Re: Y 388 / 81e Gbm.

FILE NO .: 16 β / 64 6

Eaton YaIe & Towne Ine., ~ _; ^ lli | i | ^^ Ohio / üSA

"Hydraulic press for lifters"

The invention is directed to a lift truck with fixed stands, one vertically movable relative to these Lifting carriage and a vertically extendable hydraulic press, the cylinders of which are attached to the fixed stands and its piston, which is operatively connected to the lifting carriage, over its entire length from the inner wall the press cylinder is at a distance.

In such a known construction, the usual routing is concentrated due to port failures of the press piston at its lower end all executives on the then highly stressed cylinder gland, which is then stressed accordingly and therefore

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is subject to relatively strong wear and tear when the hydraulic press is subjected to lateral forces, as this can easily occur with lift trucks of the type in question.

Furthermore, it has already been proposed that the press cylinder to be arranged in such a way on the vehicle or the fixed stands that the press cylinder can move laterally to a To enable constant alignment between the press cylinder and the press piston and thus the stress to prevent the press as a result of lateral forces. However, this requires a special fastening of the press cylinder.

The object of the present invention is to provide a solution in which the sealing members between the cylinder and With lateral forces acting on the hydraulic press, pistons do not suffer from canting stresses causing their rapid wear are exposed, without the need for special cylinder fastenings.

In a lift truck of the type specified in the introduction, this is achieved according to the invention in that the press piston slides in a sealing member arranged to be movable on all sides at the upper end of the press cylinder, in such a way that

that the press piston together with the sealing member is relative can pivot towards the press cylinder and tilt to the side when the press is extended.

The spherical sealing member can expediently be used here of two complementary parts with an intermediate one Form inner seal, with a cup-shaped seat for the spherical sealing member partly in one at the upper end of the press cylinder fixed ring member and partly formed in a detachable, preferably screw-in bearing ring can be.

Of course, the invention can also be used in conjunction with movable ones provided between fixed stands and lifting slides Stands are used.

The invention is explained in more detail below with reference to the drawing, for example. This shows in

I ¹ Ig. 1 shows a partial side view, partly shown in section, of a lift truck with a hydraulic lifting press according to the invention,

fig. 2 a section through the press,

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Fig. 3 shows a section along the line 3-3 of Fig. 2, and in

fig. 4 is a perspective view of the seal through which the press piston extends and which is included with the piston can pivot together relative to the press cylinder.

The lift truck T according to fig. 1 has a hydraulic lifting press 10 on. The lift truck T is of the usual type and has a first stand 11 attached to the vehicle, a second along the first upright 11 vertically movable upright and one along the second upright vertically movable Lifting carriage 13.

The lifting press 10 is arranged between the uprights and, as best shown in fig. 2 can be seen, a cylinder 14 attached to the first upright 11 and a piston 15? which is attached to the upper end of the second stand 12. The cylinder 14 is attached in the usual manner to the first uprights 11 by means of a ring or a base member 16 which receives the lower end of the press cylinder 14. The ring 16 is fixed to a cross member 17 extending between the lower ends of the first stator 11 and is fixed to dieeeÄ ^f FTIR "(NwÄ. The press cylinder 14 is disposed at the first stand rails 11 by the same, the lower end in the Ring 16 is used until a ring 18 attached to the press cylinder 14 on the

Up the top of the ring 16, as best Pig. 2 indicates.

The upper end of the piston 15 is attached to the end of the second upright 12 by means of a head member 19, such as Pig. 1 shows that is attached to the upper end of the piston 15 and also to a cross member 20 which is between extends the upper ends of the second uprights 12 and is attached thereto. The head link 19 carries sprockets 21 and a pair of lifting chains 22, which attack at one end on the lifting carriage 13, τοη up there and around the Guide rollers 21 extend and at their other ends by adjustable coupling members 23 on a fastening member 24 are connected, which is attached either to the first stand rails or to the Pressenaylinder 14.

In the described arrangement, the second uprights 12 are relative to the press cylinder when the piston 15 is extended 14 raised relative to the first uprights 11 with the extension speed of the press and the lifting carriage 13 is attached to the second stand rails 12 over the lifting chains 22 are raised at twice the press speed.

As shown in FIG. 2, the upper end of the press cylinder 14 is provided with a substantially spherical sealing member 25 which has a spherical outer surface 26 and a Has bore 27 through which the latter the press piston slidably extends. The sealing member 25 carries suitable Seals 28, which extend into the bore 27 and engage against the outer surface of the piston 15, in order to prevent oil from escaping between sealing member 25 and piston 15. To facilitate the arrangement of the Seals 28, the sealing member 25 is preferably formed from two complementary parts 25a and 25b.

The sealing member 25 is rotatable in a complementary shell-shaped Seat 29 arranged, which is partially formed in a ring member 30, which is at the upper end of the press cylinder 14 and partially in a threaded insert ring 31 which is removable in the ring member 30 is screwed in for assembly and disassembly of the sealing member 25. To make sure there is no leak between the sealing member 25, the ring member 30 and the screwed-in plug 31 arises, the sealing member 25 can with O-ring seals 32, which are arranged in suitable annular grooves in the outer spherical surface of the sealing member 25 are. The sealing member 25 consequently prevents liquid from escaping from the cylinder 14, the piston relative to the cylinder by supplying pressure fluid to the

The cylinder below the sealing joint 25 can be extended. Hydraulic fluid can accordingly be fed to the press cylinder through a suitable feed line 33 in the ring member 30, which is in communication with the cylinder 14 below the sealing member 25.

As can also be seen from I ¹ Ig, 2, the outer diameter of the part of the piston extending into the cylinder is of a smaller diameter than the inner diameter of the press cylinder 14, so that there is a considerable play 34 between the outer surface of the press piston 15 and the inner surface of the press cylinder 14 is given. This play, together with the fastening of the sealing member 25 which enables a universal pivoting movement relative to the upper end of the press cylinder 14, allows a lateral tilting movement of the piston 15 in all directions relative to the cylinder 14 when lateral forces are exerted on the press piston 15. Therefore, if lateral forces are applied to the upper end of the piston 15 by tilting the second uprights 12 forward or for other reasons when lifting the second uprights 12 and the lifting carriage 13, the piston 15 may also tilt under these forces, so that these forces will not are transferred to the press cylinder 14.

It can be seen that the possible inclination of the piston 15 relative to the cylinder 14 and the forward tilt of the second uprights increase as the piston 15 and the second uprights 12 are extended, so that the press at all times of the extension movement of the second uprights 12 is protected.

It can also be seen that as a result of the play 34 between the press piston 15 and the inner surface of the press cylinder 14 the piston does not slide on the inner surface of the cylinder, so that this surface of the press cylinder 14 does not need to be finished, resulting in a cheaper press construction results.

From the above description it follows that the invention provides a new type of press construction is created what special fastenings of the press cylinder makes dispensable, but the press against excessive wear and destruction as a result of laterally applied Forces is protected.

Protection claims;

Claims (4)

RA.587173-4.167 Protection claims: 1, lift truck with fixed uprights, one lifting device that can be moved vertically relative to these and one vertical extendable hydraulic press, the cylinders of which are attached to the fixed columns and the ones to the lifting carriage operatively connected piston over its entire Length from the inner wall of the press cylinder, characterized in that the press piston (15) in one at the upper end of the press cylinder (14) on all sides rotatably arranged sealing member (25) slides in such a way that the press piston (15) together with the sealing member (25) can pivot relative to the press cylinder (14) and tilt to the side when the press (10) is extended. 2. A lift truck according to claim 1, characterized in that the spherical sealing member (25) consists of two complementary parts (25a, 25b) with an intermediate inner seal (28). 3. A lift truck according to claim 1 or 2, characterized in that a shell-shaped seat (29) for the spherical sealing - 2 - member (25) partly in one at the upper end of the press cylinder (Η) fixed ring member (30) and partly in a detachable, preferably removable, bearing ring (31) trained 3s ±, 4. A lift truck, characterized by the application of the features according to claim 1 or one of the following in connection with provided between fixed uprights and lifting carriages movable stands »