GB2103523A

GB2103523A - Supporting and connecting element for vibration or percussion equipment

Info

Publication number: GB2103523A
Application number: GB8202056A
Authority: GB
Inventors: Vittorio Artioli
Original assignee: VIBROTECNICA SpA
Current assignee: VIBROTECNICA SpA
Priority date: 1981-08-07
Filing date: 1982-01-25
Publication date: 1983-02-23
Also published as: ES262790Y; DE8203368U1; IT8122602V0; ES262790U; FR2511075A3; JPS5823238U

Abstract

From a base (1) destined to the support of the equipment there extend perpendicularly two parallel sidewalls (2), each of which is constituted by at least one fixed plate (4) and by at least one movable plate (5) provided with means (19, 20) for its fastening to a movable support. Vibration damping means are arranged between the movable plate (5) and the base (1). <IMAGE>

Description

SPECIFICATION Supporting and connecting element for vibration or percussion equipment The present invention relates to a supporting and connecting element for vibration or percussion equipment, particularly for hydraulic hammers for articulated arm machines.

It is known that for the attachment of an hydraulic hammer (or other vibration or percussion equipment) to an articulated, or anyway movable, arm machine, there are usually used two superimposed elements, the lower one of which is generally called "cradle" and contains and supports the upper part or head of the hydraulic hammer and the upper one of which is generally called "cap" and is fixed, on the one hand, to said lower element and, on the other hand, in a rotary way to the free end of the articulated arm.

The abovementioned upper element or "cap" is usually constituted by a flat base destined to the support of the lower part or "cradle" and therefore of the hydraulic hammer and by two parallel sidewalls or shoulders which extend perpendicularly from said base and are passed through by aligned pairs of holes destined to the passage of respective rotating and driving pins situated at the end of the articulated arm of the machine.

Such a conventional structure has the drawback of including no kind of means for damping the vibrations created by the hydraulic hammer and preventing them from reaching, obviously with bad effects, the articulated arm of the machine.

The object of the present invention is therefore to realise a supporting and connecting element for hydraulic hammers or other vibration or percussion equipment, particularly for articulated arm machines, in which the problem of the damping of the vibrations transmitted by the hydraulic hammer or other equipment is solved in a simple and efficient way.

The invention provides a supporting and connecting element for vibration or percussion equipment, comprising a base adapted to sup port a vibration or percussion equipment and a pair of sidewalls extending perpendicularly from said base, characterised in that each of said sidewalls comprises at least one fixed plate and at least one movable plate slidable in a direction perpendicular to said base and provided with means for its fastening to a movable support of the equipment, there being provided vibration damping means located between said movable plate and said base.

It is evident that, once the connection of the equipment, for example an hydraulic ham mer, to the fixed base and of the rotating and driving pins of the movable support to the movable plate has been effected the vibration damping means arranged between the two parts damp the vibrations transmitted thereto by the equipment, preventing them from reaching the rotating and driving pins and therefore the movable support. It can thus be avoided that the latter is subjected to harmful stresses, otherwise destined to cause the rapid wear of the same.

The features of the present invention will be made more evident by the following detailed description of a preferred embodiment which is illustrated by way of non-limitative example in the enclosed drawings, in which: Figure 1 shows in perspective view said preferred embodiment of the supporting and connecting element according to the invention, Figure 2 shows one of the sidewalls of said supporting and connecting element in longitudinal section along line Il-Il of Figs. 3 and 4, Figure 3 shows said sidewall in transverse section along line Ill-Ill of Fig. 2, and Figure 4 shows said sidewall in transverse section along line IV-IV of Fig. 2.

The supporting and connecting element illustrated in the drawings constitutes the upper element or "cap" of an attachment system for hydraulic hammer, which includes also a lower element or "cradle" known per se.

The abovementioned supporting and connecting element comprises a flat base 1 and a pair of sidewalls 2, which extend perpendicularly from said base 1.

The base 1 supports the hydraulic hammer through the abovementioned "cradle", to which it can be fixed.

For this purpose there are provided holes 3 for securing screws (Fig. 3).

As shown in details in Figs. 2-4, each of the sidewalls 2 comprises two fixed external plates 4 and a movable internal plate 5.

The external plates 4 are fixed at the bottom to the base 1 and are further connected at the top by an integral bridge 6. They include stiffening ribs 7 and are passed through by pairs of aligned holes 8 and 9, each of elongate shape in a direction perpendicular to the base 1.

The internal plate 5, which includes lightening apertures 29 and stiffening ribs 30, rests on its lower edge on a damping bar 10, in its turn resting on the base 1 through a spacer 11. The bar 10 is of the so-called "silent block" kind, that is it includes an intermediate layer of rubber 1 2 between two layers of metal 13; other damping means, for example, spring damping means, can however be provided.

The movable plate 5 may slide by a limited amount in a direction perpendicular to the base 1 so as to accommodate, in operation, the thickness changes of the rubber layer 1 2 of the damping bar. The limits of such a sliding movement are fixed at the bottom by a pair of teflon (RTM) (or other material) blocks 1 4 (Fig. 2) and at the top by a metallic plate 1 5 against which the plate 5 can be abutted through a teflon (RTM) (or other material) block 1 6. The plate 1 5 is positionally adjustable by screws 1 7. If desired, the sliding of the plate 5 can be guided by suitable means, making use of mating slits 1 8 and 31 of the fixed plates 4 and the movable plate 5.

The internal plate 5 also is passed through by a pair of holes 1 9 and 20 aligned with the corresponding holes 8 and 9 of the external plates 4. While the latter are of oval shape, those of the plate 5 are, on the contrary, exactly circular and house bushes 21 and 22 passing also through the abovementioned holes 8 and 9 and provided, at one end, with abutting flanges 23 and 24 and, at the other end, with locking nuts 25, 26 with spacing rings 27, 28. Through the bushes 21, 22 of the two sidewalls 2, there are destined to pass respective rotating and driving pins of the free end of the articulated arm to which the hydraulic hammer is to be attached.

It is evident that the oval shape of the holes 8 and 9 allows the abovementioned pins to follow and, in their turn, to allow the sliding of the internal plate 5 between the two external plates 4 in a direction perpendicular to the base 1. It means that the vibrations transmitted by the hydraulic hammer to the base 1 (through the "cradle") are not further transmitted to the rotating and driving pins and consequently to the machine articulated arm, but through the damping bar 10 they arrive damped to the movable plate 5, that with its oscillatory movement with respect to the fixed plates 4 absorbs such vibrations and then returns them to the "cradle" and consequently to the hydraulic hammer.

In order to be able to work correctly, the damping bar 10 must evidently be preloaded in a suitable way, particularly in such a way that the preloading energy is higher than the impact energy of the hammer; in fact this allows the return of the received energy to the hammer which has transmitted it. To such a preloading one provides with screws 32 (Fig.

2), that through the upper bridge 6 initially push downwards the movable plate 5, after that through the screws 1 7 it is executed the corresponding predisposition of the metallic plates 1 5 and of the underneath teflon layer 16, and finally the screws 32 can be removed.

Claims

1. A supporting and connecting element for vibration of percussion equipment, comprising a base adapted to support the equipment and a pair of sidewalls extending perpendicularly from said base, characterised in that each of said sidewalls comprises at least one fixed plate and at least one movable plate slidable in a direction perpendicular to said base and provided with means for its fastening to a movable support of the equipment, there being provided vibration damping means arranged between said movable plate and said base.

2. A supporting and connecting element according to claim 3, characterised in that each of said sidewalls comprises two fixed plates and by a movable plate located therebetween.

3. A supporting and connecting element according to claim 1 or claim 2, characterised in that said damping means comprises a damping bar comprising a layer of resilient material disposed between two metallic layers.

4. A supporting and connecting element according to claim 2, characterised in that each of said movable plates is provided with a pair of circular holes for receiving rotating and driving pins carried by an articulated arm, and said fixed plates are provided with corresponding pairs of holes aligned with said circular holes but elongate in a direction perpendicular to said base.

5. A supporting and connecting element according to claim 4, characterised in that a bush is provided in respect of and passing through each set of aligned holes in said fixed plates and said movable plates.

6. A supporting and connecting element according to claim 1, characterised in that it comprises means for limiting the movement of said movable plate.

7. A supporting and connecting element according to claim 6, characterised in that said limiting means comprise fixed lower blocks and an adjustable upper plate.

8. A surprising and connecting element according to claim 1, characterised in that it comprises means for preloading said damping means.

9. A supporting and connecting element for vibration of percussion equipment substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.