FR2511075A3 - SUPPORT AND CONNECTING ELEMENT FOR VIBRATION OR PERCUSSION TOOLS, PARTICULARLY FOR HYDRAULIC HAMMERS FOR ARTICULATED ARM MACHINES - Google Patents

Abstract

ON A BASE 1 INTENDED TO CARRY THE TOOL TWO PARALLEL SIDES 2 EACH PERPENDICULARLY RISE OF WHICH IS AT LEAST ONE FIXED PLATE 4 AND AT LEAST ONE MOBILE PLATE 5 EQUIPPED WITH MEANS 21, 22 SERVING TO FIX IT TO A MOBILE SUPPORT ESPECIALLY HAS AN ARTICULATED ARM. IN PARTICULAR, THE MOBILE PLATE 4 CAN SLIDE BETWEEN TWO FIXED PLATES AND CARRIES SLEEVES 21, 22 THROUGH WHICH THE HINGE AND MANEUVER AXES THAT CONNECT IT TO THE ARTICULATED ARM AND SLIDE IN OVALIZED HOLES OF THE FIXED PLATES. A DAMPER BAR, ESPECIALLY IN RUBBER, INTERPOSED BETWEEN THE MOBILE PLATE AND THE BASE 1 WITH PRE-STRESSING PREVENTS VIBRATIONS OF THE TOOL AND THE BASE 1 FROM BEING TRANSMITTED TO THE MOBILE PLATE AND THE ARTICULATED ARM OF THE MACHINE.

Description

The present invention relates to a support and connection element

  for vibration or percussion tools, in

  especially for hydraulic hammers for articulated arm machines.

  It is known that, to mount a hydraulic hammer (or another vibration or percussion tool) on a machine with an articulated arm or anyway movable, two superimposed elements are usually used, the lower element of which is generally called "cradle" and contains or supports the top or

  head of the hydraulic hammer and the upper part of which is gener-

  generally called a "cap" and is fixed, on the one hand, to said lower element and, on the other hand, and in an orientable manner, at the end

free of the articulated arm.

  Said upper element or "hat" is usual-

  consisting of a flat base intended to support the lower part

  superior or "cradle" and, consequently, the hydraulic hammer and by two sides or shoulders which start perpendicularly from this base and are crossed by aligned pairs of holes intended to give passage to articulation and maneuvering axes placed at

  the articulated end of the machine.

  This conventional structure has the drawback of not having any type of means for damping the vibrations created.

  by the hydraulic hammer and to prevent these vibrations from reaching

  hinder the articulated arm of the machine with obviously destructive effects. The object of the invention is therefore to produce a support and connection element for hydraulic hammers or other tools

  with vibration and percussion, in particular for machines with articulated arms

  culé, in which the problem of vibration damping trans-

  placed by the hydraulic hammer or other tool is resolved

simple and efficient way.

  To achieve this object, the support and connecting element according to the invention, which comprises a flat base intended to support a vibration or percussion tool and a pair of

  flanks which run perpendicularly from said base, is characterized

  laughed at by the fact that each of the sides consists of at least one fixed plate and at least one movable plate which can slide in a direction perpendicular to said base, and which is provided with means enabling it to be fixed to a movable support of the tool, vibration damping means being interposed between said plate

mobile and base.

  It is obvious that, when the connection has been made between the tool, for example a hydraulic hammer, and the fixed base and between the articulation and maneuvering pins of the mobile support and the mobile plate, the vibration damping means

  interposed between the two parts dampen trans-

  placed by the tool, preventing them from reaching the articulation axes

  culation and maneuver, and, therefore, the mobile support.

  This prevents the latter from being subjected to harmful solicitations which would otherwise be likely to cause its

rapid wear.

  Other features and advantages of the invention

  tion will be better understood on reading the description which follows

  of an exemplary embodiment and with reference to the accompanying drawings in which: FIG. 1 shows in a perspective view said preferred embodiment of the support and connection element according to the invention; Figure 2 shows one of the sides of said support and connecting element, in longitudinal section along the lines Il-Il of Figures 3 and 4

  FIG. 3 shows said side in cross section

  dirty along line III-III of Figure 2;

  FIG. 4 shows said side in cross section

  dirty along line IV-IV of figure 2.

  The support and connection element shown in the drawings is particularly intended to constitute the element

  top or cap of a mounting device for hydro hammer

  which also includes a known lower element or cradle

in itself.

  Said support and connection element also comprises a planar base 1 and a pair of flanks 2-which extend

perpendicularly from this base.

  Base 1 is intended to support the hydraulic hammer

  lique through the cradle to which it can be attached.

  To this end, holes 3 are provided for the passage of the screws.

fixing (figure 3).

  As indicated in detail in FIGS. 2 to 4, each of the sidewalls 2 actually comprises two fixed external plates 4 and a movable internal plate 5. The external plates 4 are fixed to the base 1 in their lower region and they are also linked together

  in their upper region by an integral trigger guard 6 They include

  tent reinforcing ribs 7 and are crossed by pairs of aligned holes 8 and 9 which all have an elongated shape in

  a direction perpendicular to the base 1.

  The inner plate 5 which has windows

  lightening 29 and reinforcing ribs 30 rests on its side.

  on a damping bar 10 which in turn is supported on the base 1 by means of a separator 11 The bar 10 is of the type of

  shock absorber blocks known as "Silent block",

  ie it includes an intermediate rubber layer 12 in-

  sandwiched between two layers of steel 13 We can however also provide

  ment of other damping means, for example spring means.

  The movable plate 5 can describe a limited sliding in a direction perpendicular to the base 1, this freedom favoring in operation the thickness variations of the rubber layer 12 of the damping bar The limits of this sliding are fixed, downwards , by a pair of small blocks 14 (Figure 2) in "Teflon" (or similar material) and, upwards, by a metal plate 15 against which the plate 5 can be supported by means of a layer 16 in "Teflon" (or other similar material) The plate 15 is held in position in an adjustable manner by means of screws 17 The sliding of the plate 5 can also be optionally guided by suitable means which use aligned slots 18 and 31 formed in the plates

fixed 4 and in the movable plate 5.

  The inner plate 5 is also crossed by a pair of holes 19 and 20 aligned with the corresponding holes 8 and 9 of the outer plates 4 While these latter holes are oval, those of the plate 5 are on the contrary exactly circular and they contain sleeves 21 and 22 which pass through

  also holes 8 and 9 and are provided at one end with a glue

  abutment rim 23, 24 and, at the other end, a locking ring 25, 26, completed with a spacer ring 27, 28 Articulation and operating axes of the free end of the arm articulated to which the hydraulic hammer is to be attached are intended to pass through

  the sleeves 21, 22 of the two sides 2.

  It is obvious that the oval shape of the holes 8 and 9 allows the said axes of articulation to authorize, then to accompany the sliding of the inner plate 5 between the two plates

  outside 4 in one direction, perpendicular to base 1.

  This means that the vibrations transmitted to the base 1 by the hydraulic hammer (via the cradle) are not ultimately passed on to these articulation and operating axes nor, consequently, to the articulated arm of the machine, but that, on the contrary, through the damper bar 10, there is no vibration in the damped state at the movable plate 5 which, by its oscillatory movement relative to the fixed plates 4, absorbs these vibrations and restores them to the cradle and, consequently , with a hydraulic hammer. To be able to work properly> the bar

  shock absorber 10 must obviously be pre-stressed in an appropriate

  requested, in particular in such a way that the prestressing energy is greater than the impact energy of the hammer; this allows indeed

  the aforementioned return of the energy received by the hammer which emitted it -

  This prestressing is carried out by means of the screws 32 (FIG. 2) which initially push the movable plate 5 downwards through the upper bridge 6, after which, by means of the screws 17, the corresponding positioning of the plate is carried out metallic 5 and

  the underlying "Teflon" layer 16, the screws 32 being able to be removed

ultimately.

  Of course, various modifications can be made by those skilled in the art to the embodiment which has just been described only by way of example, without departing from the

part of the invention.

251107 t 5

Claims (6)

R E V E N D I C A T I O N S   1 Support and connecting element for vibration or percussion tools, in particular for hydraulic hammers for machines with articulated arm, which comprises a base intended to support the tool and two parallel flanks which run perpendicularly from this base, this element being characterized in that each of said sides (2) consists of at least one fixed plate and at least one movable plate (5) which slides in a direction perpendicular to said base (1) and is provided with means (21, 22 ) allowing it to be fixed to a mobile support of the tool, vibration damping means (10) being interposed between the plate mobile (4) and the base (1).   2 support and connection element according to claim 1, characterized in that each of the sides (2) is   composed of two fixed outer plates (4) and an inner plate mobile upper (5).   3 Support and connecting element according to one   claims 1 and 2, characterized in that said means   shock absorbers consist of a shock absorber bar (10) of the   type of damper blocks known under the designation "Silent Block".   4 Support and connection element according to the resale   dication 2, characterized in that said movable plate is provided with a   pair of circular holes (19,20) intended to receive axes of ar   ticulation and maneuver carried by an articulated arm and that said fixed plates (4) are provided with pairs of corresponding holes (8 and 9) which coincide with said holes (19, 20) but are elongated   in the direction of movement of said movable plate.   Support and connecting element according to claim 1, characterized in that it comprises means (14, 15)   for limiting the movement of said movable plate (5).   6 support and connection element according to claim 5, characterized in that said limiting means   comprise fixed lower blocks (14) and an upper plate adjustable upper (15).   7 support and connection element according to claim 1, characterized in that it comprises means (17) for   prestressing of said damping means (10).