FR2586667A1 - SELF-HOLDING LIFT WITH TWIN TELESCOPIC ARMS - Google Patents

Abstract

FREESTANDING LOADER INCLUDING TWO TWIN TELESCOPIC ARMS B. EACH ARM INCLUDES A NUMBER OF PRISMATIC TELESCOPIC SECTORS 105 TO 109, 105A TO 109A THAT CAN BE ACTIONED IN THE LONGITUDINAL DIRECTION BY MEANS OF A LONGITUDINAL TELESCOPIC TELESCOPIC SECTORS 104 OF THE LONGITUDINAL DIRECTION OF THE LONGITUDINAL 104 OF THE TELESCOPIC LENGTH TWIN ARMS ON WHICH IS MOUNTED A TROLLEY 120 WITH LOADING PLATFORM 119. THE TROLLEY AND THE PLATFORM ARE MOBILE ALONG THE ARMS BY THE TRACTION OF TWO METAL CABLES ASSOCIATED WITH A WINCH 121. THE TROLLEY IS EQUIPPED WITH A AUTOMATIC EMERGENCY BRAKE. THE TWIN TELESCOPIC ARMS ARE SUPPORTED BY A ROTATING CRAPAUDINE 101 MOUNTED ON THE PLATE OF A VEHICLE A. A PAIR OF HYDRAULIC CYLINDERS 103 STABILIZES THE TILT OF THE ARMS IN THE USE POSITION.

Description

258666? 7

  Self-lifted freight elevator with twin telescopic arms The invention relates to

telescopic twin.

self-supporting arm lift

  There is already known a freight elevator comprising telescopic arms

  twin copics, fitted with a basic strainer, which can be mounted on the platform of a motor vehicle or a vehicle in general. On the twin arms is mounted a

  trolley associated with a platform allowing trans-

  raise people and / or things to a significant height.

  The carriage is linked to a metal cable which leads to a machine winch. For the actuation of the winch and the angular movement of the slider is provided a

  engine independent of the vehicle engine. A hydraulic cylinder

  The single-acting telescopic link ensures the deployment of the arm sectors. Two other hydraulic cylinders, articulated with the basket and the first elements of the arms, determine the desired inclination of the latter in position

  of use. The carriage associated with the loading platform-

  it is fitted with an automatic emergency brake.

  To facilitate the use of the known freight elevator, it appeared necessary to make certain improvements to the essential organs of the machine. The main improvements relate to the trolley with platform, its emergency brake, the cable actuation system

  of the carriage on the telescopic arms.

  These improvements constitute the object of the present invention and essentially consist in that: the trolley with platform is provided with four symmetrical pairs of rollers, each pair framing the telescopic arms and the frustoconical peripheral surface of the rollers constantly adhering to the surfaces parallel and

  opposite as well as to the outer sides of the two telescopic arms

  copics of the traffic lane, and these rollers being associated with supports with deformable pendulums so as to follow the variable cross-section of the telescopic elements thanks to the traction exerted on the carriage and to the reaction of elastic means described below; - the emergency brake is automatically activated, by the reaction of at least one robust spiral spring, in the event of rupture of the traction cables; - the cable traction system comprises two steel cables connected to a winch fitted with an internal brake; - the machine is equipped with a second winch with internal brake to allow the pressurization of the telescopic hydraulic cylinder.

  Other characteristics and advantages of the invention stand out

  derived from the detailed description given below and

  attached drawings in which: - Figure 1 is an axonometric view of the complete machine in the operating position, mounted on a truck; Figure 2 is a schematic view on a different scale, partially showing one of the two telescopic elements in longitudinal section; - Figure 3 is a schematic cross-sectional view of one of the telescopic arms, with part of the carriage but without the platform; - Figure 4 is a side view of the parts shown in Figure 3; - Figure 5 is a perspective view from bottom to top of the parts shown in Figures 3 and 4;

  - Figure 6 is a perspective view of the telescopic arms

  pikes in partial longitudinal extension, including the trolley's traction winch; - Figures 7 and 8 illustrate in perspective a sidewall and the upper part of the carriage, without the platform; - Figure 9 is a schematic plan view of the cable system for pulling the carriage;

  - Figure 10 is a cross section of a telescopic arm

  copy along line X-X of Figure 2;

  - Figure 11 is a cross section of one of the sec-

  tors constituting the telescopic arms; - Figures 12 and 13 show the diagram of the working field of the machine respectively with reference to the longitudinal axis and the vertical axis of the vehicle on which the machine is mounted; - Figure 14 shows a detail of the lower part of the arms;

  - Figures 15 and 16 illustrate, in different positions

  annuities, the means of controlling cable tension

traction.

  Reference is made to FIGS. 1 and 2. A indicates the motor vehicle on the plate of which the base plate 101, which can rotate by more than 360, is mounted, rotated by the hydraulic motor 102 with incorporated brake. 103 indicates a pair of hydraulic cylinders hinged to the bucket 101. The ends of the rods of these cylinders are hinged individually to tubular sectors 105,

  a whose lower ends are also articulated

  abutments with the swash plate 101 and which constitute the first section of the twin telescopic arms B. The following sectors 106, 107, 108, 109 and 106a, 107a, 108a, 109a respectively for the two arms are also

  tubular and have a cross section of the same configuration

  geometric ration as sectors 105 and 105a. All the sectors of the two telescopic arms are made of steel and with a trapezoidal cross section, as shown in FIGS. 3 and 11, in order to produce six longitudinal edges for each,

  indicated by S in FIG. 11, in order to improve the resistance

  bending strength of B arms when loaded

  in the working position illustrated in Figure 1.

  104 indicates a hydraulic cylinder with telescopic rod whose end part is articulated in the center of a metal bridge 200 which transversely connects the ends

  free from the terminal telescopic sectors 109, 109a.

  112 indicates a pair of rubberized rollers intended to apply the end of the arms B, for example to the support of a window or a balcony, such an application being essential. On the arms B is mounted the carriage 120 which supports the platform 119 provided with lifting edges articulated relative to its base. These edges can be folded outwards from an angle of 90 to a

  coplanar position at the base of the carriage, so as to increase

  be the surface of the load plane and facilitate loading

manual of various elements.

  In Figure 1, 113 indicates one of the four angle cylinders

  to stabilize the platform that supports the machine.

  114 indicates an easel for the support of the arms B when the latter are fully retracted and in the rest position, the carriage 120 and the platform 119 being carried by the

  sectors 105 and 105a. 115 indicates an engine for action-

  hydraulic cylinder 104 and 116 gearbox

  associated with engine 115. 118 indicates a hydraulic distributor

  lique connected to control members located on board the motor vehicle A. 121 indicates a first winch and 201 a second winch, both provided with internal brakes, the destination of which is described below. 122 indicates the remote control with which the machine is equipped in addition to the controls

  manual and remote radio control.

  The carriage 120 (see figures 7, 8 and 14) supports the platform

  form 119. This platform is articulated at the front to legs forming forks 202 carried by the chassis of the carriage and is articulated at the rear to rods 123 threaded on the right and on the left, adjustable in height so as to put level the platform plan. The rods 123 can be replaced by any other equivalent device, such as hydraulic, pneumatic cylinders, or various mechanisms. The chassis of the carriage 120 is provided on its two sides with symmetrical articulated arms 124, 125 (FIGS. 3, 4, 5) at the ends of which are frustoconical rollers 126, 127, provided with cheeks and rotating, tangent to the lower surface and to the outer sides of the two corresponding telescopic elements. Similar rollers 128, 129, carried by arms 224 (Figures 3,4) are mounted tangent to the upper surface and to the internal sides of the same telescopic elements. The rollers 128, 129 are rotatably mounted on pivots fixed relative to

  which they cannot move in the axial direction.

  The rollers of the other upper pair and the rollers of

  two lower pairs are mounted on rotational pivots

  tion corresponding with interposition of helical springs reacting between the outer surface of the cheek of each roller and the parts of the chassis carrying the pivots on which the rollers are mounted free. All the pivots of the four pairs of rollers can be provided with springs 130. The arms 124, 125 are articulated in 132 to tie rods 203, themselves articulated in 132a to arms 204 arranged symmetrically on the sides of the carriage 120. To the arms 204 is associated with the crossbar 205 (Figures 7,8), which can rotate about its axis and relative to the chassis of the carriage. The bar 205 is provided with a radial bar 206 in the center of which the fork end engages

  lever 207. The opposite end of the latter is articulated

  abutment at bar 208, parallel to bar 205, and rotatably mounted relative to the chassis of the carriage 120. Coaxial with the bar 208 is mounted the spiral spring 209, tensioned and assembled to the chassis of the carriage so as to react in the

  direction indicated by the arrows in figure 8.

  The constant adhesion of the rollers 126, 127 to the running surface of the corresponding telescopic elements is ensured by the pulling action exerted by two metal cables 131 (Figures 6,7,8), one end of which is anchored to radial lugs 215 of the bar 208, while the opposite end, through deflection pulleys 211, 212, 213, carried by the carriage, and 137 mounted at the top of the telescopic end elements of the arms B, is anchored

  to the winch drum 121 (Figures 1 and 6).

  As shown in Figures 2 and 10, each remote sector

  copique des bras B is fitted at its top with a console 140.

  The symmetrical brackets of telescopic sectors correspond to

  pins support a pin 141 which can rotate freely.

  Fixed to each spindle 141 is a pair of toothed wheels 142, the teeth of which are in a symmetrical radial position. The toothed wheels supported by the console 140 (FIG. 2) integral with the basic telescopic elements, 105a is positioned relative to these so that the teeth 143 engage in recesses 150 carried by the surfaces of these same elements 105, 105a turned towards the teeth of the wheels. This arrangement is repeated for all the telescopic elements constituting the arms B, with the exception of the terminal elements 109, 109a

  which are fitted with support rollers 112 or equivalent means

  valent. The pitch between the successive teeth of each wheel 142 and the distance between two recesses 150 are such that a pair of symmetrical teeth of a pair of wheels

  any one begins to cooperate with the corresponding recesses

  before the previous pair of teeth is completely disengaged from the recesses associated therewith, so as to produce a sequential and constant meshing avoiding any sliding movement between the telescopic sectors of the two arms. The toothed wheels 142 meshing with all the telescopic sectors thus ensure correct and synchronized longitudinal movement of these sectors both in the extension phase and in the retraction phase

  arms B, thus avoiding any jamming.

  According to the invention, the machine is provided with a second winch 201 (FIG. 1) on which a wire rope 220 is wound and unwound, one end of which is anchored to the winch drum and the opposite end of which is returned by a pulley 221, is anchored at a fixed point at the base of

the machine.

  On the elements 105, 105a of the arms B (FIG. 14) are slidably mounted two extensions 234, for the purposes described below. The operation of the machine is as follows: The vehicle A being placed in the position chosen for the work of the freight elevator, the hydraulic cylinders 103 are actuated to stabilize the working inclination of the arms B. The winch drums 121 and 201 are released to allow the unwinding of the cables 131 and 220 without putting the carriage 120 and the platform into action, rotary jaws 232 (FIG. 14) being hooked to the rear cross member of the carriage 120. The cylinder 104 is then activated. which operates the correct extension of the arms B thanks to the presence of the toothed wheels 142. The deployment of the arms can be stopped at any height between their minimum height and their maximum height. The desired height having been reached, within the limit of the maximum height that can be reached by the end of the arms, the winch 201 is then blocked and the hydraulic cylinder 104 is pressurized. Finally, the winch 121 which carries the carriage 120 and platform 119 at the desired height. This maneuver ensures the stability of the B arms under load, under the tension of the hydraulic cylinder

  and against the reaction of the cable 220 of the winch 201.

  It is important to note that the upper ends of the

  two arms B are fitted with electrical sensors which provide

  give an authorization signal to the driven electric motor

  hoisting winch 121 only if these ends are pressed against a fixed point. If one of the two ends is not supported

  not stably, winch 121 cannot come into action.

  When loading and unloading the platform

  form 119, in the lowest position thereof,

  the extensions 234 are locked in the working position.

  On the contrary, when the machine is at rest, these extensions are retracted on the elements 105, 105a and locked in the rest position both by the pressure screws 233

  and by the chains 235 which cooperate with the hooks 231.

  As shown in FIGS. 15 and 16, preferably near the winch 121, the traction cables 131 slide, with a slight angular deviation, around the periphery of a bar 237 supported by a compass mechanism 237a. The mechanism 237a is subjected to the tension of a spring 238

  and maintained, against this traction, in the position shown

  felt in FIG. 15, by the tension of the cables 131. If,

  for some reason the cables are loosened-

  spring 238 recalls compass 237a in the posi-

  tion shown in Figure 16 in which tooth 240

  acts on switch 239, which is connected to an electro-

  valve which instantly discharges the arrival of oil to the telescopic cylinder 104 and interrupts all

  another machine activity that is blocked.

  The description above clearly shows the possibilities

  usability, versatility and reliability of function

  machine which can be used advantageously-

  in many cases including, in addition to normal use for the loading and unloading of various objects, in premises located at a significant height and outside

  of these, use in emergencies that require

  manage the immediate evacuation of people and things from

  upper floors of any building.

  As indicated above, the machine is provided with manual controls and a remote control 122 which can be operated from the ground and by radio controls for remote control, while the platform is provided with a control panel for the maneuvering the trolley by the

flight attendants.

Claims (10)

Claims   1.- Self-supporting freight elevator mounted on a rotating basket, characterized in that it comprises twin arms (B), each formed of telescopic sectors (105 ... 109, 105a ... 109a), the corresponding telescopic sectors of two arms being coupled in transverse direction and secured   to mechanisms capable of determining long movements   simultaneous tudinals of the same amplitude for each pair of associated sectors, said arms (B) being extendable longitudinally by the action of a telescopic hydraulic cylinder (104) with single effect, a carriage (120) with platform (119) being mounted on the arms (B) and capable of being actuated by two metal cables (131) connected to a winch (121), said carriage being provided with four pairs of frustoconical rollers and provided with cheeks (126-127, 128-129) which frame the arms, the cheeks of the pebbles being subject   to the reaction of elastic means (130) which ensure the adhesion   rence of these on the sides of the telescopic arms and the rollers being supported by the lateral and symmetrical structures of the chassis, constituted by levers articulated in pantographs (124,125,203,132) suitable for ensuring the adhesion of the rolling surface of the rollers with respect to to the corresponding surfaces of the arms, in that it further comprises a second winch (201) provided with an internal brake, the metal cable of which is mounted so as to block the arms (B) at any desired height and to allow the pressurizing the telescopic hydraulic cylinder (104) in order to stabilize the arms under the load of the carriage (120), and in that the carriage (120) is provided with an automatic emergency brake (214), a device (237,237a) being provided so as to block the activity of the machine   in the event of loosening of the cables connected to the winches.   2. A freight elevator according to claim 1, characterized in that the deployment and sequential retraction of the telescopic elements (105.   109, 105a ... 109a) are controlled by pairs of toothed wheels (142) integral with each other, mounted at the top of each telescopic element, .. CLMF: whose teeth (143) mesh in corresponding recesses-   layers (150) carried by the surfaces facing the   wheels of the various telescopic elements.   3. A freight elevator according to one of the preceding claims,   characterized in that it comprises three hydraulic cylinders, including a telescopic cylinder (104) intended for the deployment of the arms (B) and two cylinders (103) intended to stabilize the inclination of these.   4. A freight elevator according to one of the preceding claims,   characterized in that the carriage (120) is supported by   four pairs of rollers (126-127, 128-129) mounted diagonally-   ment opposite to each of the arms (B), supported by levers (124,125,203,132) articulated in pantographs, under the pulling action of a bar (205) associated with a second bar (208) connected to the metal cables (131 )   can be driven by a winch (121).   5. Montecharge according to one of the preceding claims,   characterized in that the chassis of the carriage is provided with a rotary transverse bar (208) which carries at its ends, in correspondence with the rolling surfaces of the upper rollers of the carriage, a pair of opposite toothed cams (214), said transverse bar (208) being subjected to the reaction of elastic means (209) tending to cause the cams (214) to interfere with the running surface of said rollers, said bar being further provided with radial lugs (215) for anchoring the one of the ends of the cables (131) whose opposite ends are anchored to the winch (121) which ensures the movement of the carriage along arms (B).   6. A freight elevator according to one of the preceding claims,   characterized in that the adhesion of the rollers (126,127-   128,129) in relation to the rolling surfaces is ensured by the components generated by the traction of the cables   (131) and by the reaction of elastic means (130).   7. A freight elevator according to one of the preceding claims,   characterized in that it comprises two winches, one (121) for pulling the carriage (120) connected to a pair of cables (131), operating the retraction of the telescopic arms (B) and the telescopic cylinder (104) , the other (210) acting on a single cable for pressurizing the cylinder telescopic (104).   8. A freight elevator according to one of the preceding claims,   characterized in that on the periphery of the telescopic elements   basic copics (105,105a) are fitted with sliding extensions (234) suitable for resting on the ground and allowing the carriage (120) and the platform to be lowered as much as possible, said extensions being returned to the inactive position by a short movement of the carriage to which they   are hung and locked in position.   9. A freight elevator according to one of the preceding claims,   characterized in that it comprises an automatic switch (239) for the activity of the machine which comes into action in the event of slackening of the tension of the metal cables   winches when in action.   10.- freight elevator according to one of the preceding claims,   characterized in that it includes manual controls, controls on the platform, remote controls and remote radio controls.