FR2483386A1 - TRIPLE MAT FOR FORKLIFT FORKLIFT - Google Patents

Abstract

A. TRIPLE MAT FOR FORK LIFT TRUCK. B. ONE OR MORE OPERATING CYLINDERS 5 IS OR ARE FIXED MOUNTED ON THE SECOND TORQUE OF UPRIGHTS 2, THE CYLINDER OR CYLINDERS 5 BEING EQUIPPED WITH PISTON RODS 6, 7 THAT CAN EXTEND UP AND DOWN WITH PULLEYS 8, 9 FOR ROPES OR CHAIN 11, 12, A FIRST ROPE OR CHAIN 11 IS FIXED TO THE UPPER PART OF THE FIRST TORQUE OF UPRIGHTS 1, PASSES ON A PULLEY 8 MOUNTED ON THE PISTON ROD 6 WHICH IS ' EXTENDS DOWN, ON A PULLEY 10 AT THE UPPER PART OF THE THIRD PAIR OF UPRIGHTS 3 AND DESCEND DOWN TO THE FORK CARRIER 4 WHERE IT IS ATTACHED AND A SECOND ROPE OR CHAIN 12 IS ATTACHED TO THE SECOND PAIR OF UPRIGHTS 2, PASS ON A PULLEY 9 MOUNTED ON PISTON ROD 7 EXTENDS UPWARD AND IS ATTACHED TO LOWER PART OF THIRD COUPLE OF UPRIGHTS 3. C. HANDLING.

Description

1 2483386

  Forklifts, which must be able to work in small spaces, but which must at the same time provide a large lift, may advantageously consist of a triple mast, that is to say a mast having three pairs of amounts. In addition, the mast must be arranged in free-lift mast,

  that is, the fork carrier is brought into the po-

  highest level before the movement begins

elevation of the amounts.

  The invention aims at a simple elevator assembly

  for a triple mast by placing the cylinder or

  rins of operation in a different way and by passing ropes or lift chains in a different way. Using two jacks placed on

  the sides having piston rods extending telescope

  in opposite directions, we obtain a

  good visibility through the mast.

  The mat according to the invention comprises a first pair of uprights which is carried by a carriage and which is normally articulated thereto, so as to obtain what is known as a rocking movement. A second

  couple of uprights is mounted so as to be able to

  see vertically in the first couple of amounts. A third pair of uprights can move vertically in the second pair of uprights. A fork carrier is

  ordered by the third pair of amounts and is

  so that it can move vertically.

  According to the invention, one or more operating cylinders, to obtain the lift, are arranged in the second pair of amounts. When using a single operating cylinder, this cylinder consists of two pistons having a single piston rod extending upwards and a single piston rod extending towards

  the bottom. When using several operating cylinders

  In addition, different cylinders can be used

  for piston rods extending upwards

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  and for those extending downwards. Two systems to

  Distinct chain or ropes are used in the mast.

  One end of a first string or rope is

  attached to the upper part of the first pair of uprights.

  It passes on a pulley mounted on a piston rod extending downwards, to go on a pulley mounted on the upper part of the third pair of amounts

  and from there, go down to the fork carriage. The other

  The rope is attached to the fork carrier. The ex-

  the end of a second chain or coidus is fixed at

  xth pair of amounts, passes on a pulley mounted on the piston rod extending upwards and is fixed by

  the other end at the bottom of the third neck

full of amounts.

  In the attached drawings, given solely for the purpose of

example

  Figures 1 to 3 show a triple mast in various operating positions, and

  Figures 4 and 5 show a cylinder of operation

  double piston rods while these rods

  are in retracted position and exit respectively.

  A first pair of uprights 1 is articulated on a carriage (not shown). * A second pair of amounts

  2 is guided by the first pair of amounts. The third

  the second pair of uprights 3 is guided by the second pair of uprights 2 and the fork carrier 4 is controlled by this

  third pair of amounts 3. A cylinder 5 of operation

  is fixed on the second pair of uprights.

  Rin 5 is of the type having two rods 6 and 7 of piston

  respectively that can extend in opposite directions. These rods respectively carry pulleys 8

  and 9. At the top of the third pair of

  3, there is a pulley 10. A rope or chain 11

  is attached to the upper part of the first couple of

  tents 1 and the fork carrier 4. It passes over the

  8 and 10. A rope-or chain 12 is attached to the

  xth pair of uprights 2 and at the bottom of the third pair of uprights 3. This string or rope

pass on the pulley 9.

  The jack 5 can be arranged in the illustrated manner.

  in Figures 4 and 5. It may consist of a cylinder

  13 which is attached to the second pair of uprights 2. This cylinder contains a piston rod 6 extending downwards and a tubular piston rod 7 extending upwards. In the retracted position, the piston rod 6 is

  engaged in the rod 7 .. The interior 14 of the cylinder 5 is.

  supplied with pressurized fluid through line 15.

  During operation, the forces acting on the piston rod 7 are twice as large as those acting on the rod 6. By giving the surface of the piston rod 6 a value a little larger than half that of rod 7, we can make sure that

  the load carrier moves to the highest position

  before the uprights 2 and 3 are raised. Where appropriate, it may be appropriate to provide a

  lock, which locks the fork carrier 4 in the

  position and maintains it while the

  ples 2 and 3 of amounts rise and fall. When the load carrier 4 has been brought to the upper position illustrated in Figure 2, telescopically deploying

  the piston rod 6, the pressure in the space 14 becomes

  raises until the force acting on the piston rod 7 is overcome. The piston rod 7 is out

  and the fork carrier is lifted at the same time as the

  ples 2 and 3 of amounts (see Figure 3). For the lowering

  firstly, the pairs 2 and 3 of the uprights are lowered while the fork carrier is in the highest position relative to the torque 3. When the pairs of uprights have been brought back to their lower position,

  lower the fork carrier with respect to the torque

  tives. The triple lift mast, provided with the jack described herein, allows the fork carriage to be operated at a constant lift speed during the entire lift. The pressure of the pressure medium is essentially constant throughout the lift, if the area of the piston rod 7 is twice that of the rod 6.

Claims (4)

  1) Triple handling mast, preferably mounted   on forklifts, comprising a first   first pair of uprights (1) which is mounted on a carriage, a second pair of uprights (2), which can move vertically and which is guided by the first pair of uprights (1), a third pair of uprights (3) , which can move vertically and is guided by the second pair of uprights (2), and a fork carrier (4), which can move vertically and which is guided by the third pair of uprights (3), characterized one   or more operating cylinders (5) are / or are   fixed on the second pair of uprights (2), the cylinder or cylinders (5) being provided with piston rods (6, 7) which can extend upwards and downwards with pulleys (8, 9) for ropes or catkins (11, 12), a first rope or chain (11) is fixed to the upper part of the first pair of uprights (1), passes over   a pulley (8) mounted on the piston rod (6) which   downward on a pulley (10) at the top   the third pair of uprights (3) and-goes down towards the doorfourche- (4) where it is fixed and a second   rope or chain (12) is attached to the second pair of   tants (2), passes over a pulley (9) mounted on the rod (7)   piston extending upwards and is attached to the   lower part of the third pair of uprights (3).   2) Triple mast according to claim 1, characterized   in that it comprises two separate operating cylinders (5) having a single piston rod extending towards   the bottom and a single piston rod extending upwards.   3) MAt triple according to claim 1, characterized   characterized in that it comprises an operating cylinder (5) having a single piston rod extending downwards and   a single piston rod extending upwards.   4) Triple mast according to claim 3, characterized   in that the piston rod (7) extending towards the 6: 2483386   high has a surface that is less than twice that   piston rod (6) extending downwards.