IL22915A - Hydraulic winch with self clamping jaws - Google Patents

Description

ay Hydraulic winch with self clamping jaws OFFICE ET CONTROLS 21998 2 Traction and lifting devices are known which comprise olamping Jaws by means of and by virtue of the alternate opening closing of these jaws and their displacement one relative to the other there oan be for a pulling movement on a Such devioes when they are manually controlled have the disadvantage of being slow and of causing considerably rapid wear of the jaws during the reverse movement of the When on the other hand the devices are provided with a meohanical they are so designed as to develop efforts for stretching or tearing and are unsuitable for lifting which should capable of being effected with a maximum of The present invention has as its object the remedying of these disadvantages and concerned for this a hydraulic having two pairs of means for controllin the clamping and of the bits of each pair of jaws characterized by at least one drive jack having a one pair of being connected with the shaft f of the drive jack to be movable thereby relative to the pair of the second pair of jaws being stationary and arranged adjacent the end of the jack remote from the movable pair of In accordance with one embodiment of the invention the shaft of the drive jack is hollow and the jack is so arranged as to permit a traction oable to pass coaxially through it and through a central guide The opening and closing control device of these jaws is stituted by a telescopic system of rods which operate at their According to another characteristic of the invention the winoh comprises a hydraulic circuit provided with a distributor which can cause the of the direction of the movement of the According to another characteristic of the invention the hydraulic circuit is provided with a hydraulic braking valve for the load limiting the speed of the load when the latter is According to another characteristic of the invention the control of the valve of the load is responsive to the pressure of the According to another characteristic of the invention the control of the load valve is responsive to the pressure of unolamplng of the fixed jaw by the a pilot valve in a manner as to maintain said slightly clamping the cable during the course of braking of the The equally extends to other characteristics listed below and to their various differing A in accordance with the invention is shown by way of example in the accompanying drawings in 1 shows schematically a winch having clamping 2 illustrates a further embodiment of a winch having a rod system for controlling the opening and of the illustrates a further embodiment of a winch having pairs of drive 4 is longitudinal section of the device shown along the line of 5 is longitudinal of the device along the line of the view shown in 6 shows schematically a further embodiment of a winch having a for opening the fixed 7 shows schematically a further embodiment of a winch having a drive jaok with hollow shaft and central tube for the passage of a 8 shows a further embodiment of a winch having bodies which enclose the drive means and clamping and unelamping control is a section of the embodiment shown in and 10 shows schematically an assembly of an hydraulic control circuit controlling the displacement o the jaws of the winch shown in Θ and In the embodiment shown in 4 and 5 the hydraulic wineh in accordance with the invention comprises two j 1 and 2 in which two pairs of levers 4 and which are coupled together so as to obtain a multiplicatio effect for example causing by approach or separation of the two jaw bits 6 and 5 6 w carry this purpose lateral trunnions 7g and which engage in corresponding recesses of the articulated levers whose axes of articulation 8 and are mounted in external side plates two pairs of levers 4 and extend below the bits as to control the opening and closing of these A compression located in a casing 9 and on one o these of lovers so as to initiate the of the In the embodiments shown in the 1 is located between the pair of cylinders 10 and of two driving jacks which are at their extremities two common plates 11 and plate 11 comprises a device for anohoring the winch and a boss 14 for fixing the fixed jaw shafts 17 and of the coupled jacks secured at their extremity a coupling bar 19 which passes through the two plates and of the jaw 2 as to drive other extremit the ja 2 carries two lateral arms 20 and which can slide on lateral 21 and eoupled by a plate 22 carrying a central hole 23 through which the cable can A telescopic tubular cable guide device is located between the two jaws 1 and 2 and comprises elements and auxiliary jack 27 for controlling the opening of the jaw bits articulated by the base of its cylinder 28 to an upper extension of the lever 4 of the jaw l and by the extremity of the shaft to an Upper extremity of the the jaw A system of rods 31 articulated at and terminating at its other extremity in the form of a hook 32 permits the temporary of extremities 5 and the levers 4 and so as to achieve the simultaneous opening of the 1 and 2 for the introduction or of the In a oecond embodiment of a winch as seen in 6 comprising at least one drive jack for the the extremities of the levers 4 and of the two jaws are coupled an auxiliary jack for controlling the opening of the jaw Shis auxiliary jack comprises a cylinder 35 which is a long shaft 36 articulated to the extremity of the lever short shaft 38 articulated to the extremity of the lever 4 and a coaxial shaft 40 which renders the two shafts temporarily rigidified whilst the long shaft 36 is almost completely In a third embodiment shown in the winch comprises a single drive jaok said jack comprising a hollow shaft a 43 and a central tube 44 for the passage of the cable formed rigidly with the base of the cylinder and slidable in a sealed manner in the interior of the hollow shaft In a fourth embodiment of a comprising at least one drive jack for the the opening and closing control device of the jaws comprises a first telescopic system of rods of which the elements 46 and 47 are articulated to levers 3 and of the fixed and movable jaws and a second telescopic system parallel to the first whose elements 48 51 and are respectively articulated to one of the limbs of freely movable levers 49 and themselves articulated at and the othe limbs of which terminate in hooks 50 and abutments 53 and 56 whilst the other element carries a movable bracket 54 57 which actuated axially on the preceding abutments a little in advance of the extremity of the rod systems the second rod system always operating before the the jaws are completely open the hooks 50 and by the spring 58 and onto the abutments 59 and the jaws are closed the hook 50 and abut the abutments 59 and 5 so as to prevent the rotation of the free When the movable abutments 54 and 57 are in place the arrival at the end of its stroke of the shaft 17 first of all causes the closing of the movable j w 2 by the upper rod system and after that the complete opening of the fixed jaw 1 with the locking of the hook 50 b other rod After reversal of this movement the arrival at the end of its stroke of the shaft 17 causes first of all the closing of the fixed jaw 1 by the rod system and after that the complete opening of the movable jaw 2 with locking by the hook by the other rod When the movable abutments 54 and 57 are raised the telescopic rod systems and can move freely and no longer exert any action on the opening or closing of the a fifth embodiment shown in 9 and 10 the hydraulic winch comprises a jack body 60 carrying two end plates 61 and 62 and a fixed sealed partition 63 closer to the plate 62 than to the plate 61 which separates the of the body 60 into two elementary cylinders and unequal The larger cylinder receives movable equipment comprising principal piston 64 to the extremity of a hollow shaft receiving at its free extremity a rooking lever 66 and an auxiliary piston 67 fixed to the extremity of a hollow shaft 68 which passes coaxially with a certain amount of play through the hollow shaft in a sealed and sliding through the swinging lever 66 so to receive at its free extremity a bridle The smaller cylinder receives a piston 70 secured to a hollow shaft 71 which can slide through the plate 62 so as to reoeive at its free extremity a bridle A central tube 73 the passage of the formed integrally with the auxiliary piston 70 traverses in a sliding and sealed fashion the fixed partition 63 and the auxiliary piston 67 so as to into the interior of the hollow shaft A sel w 7 is fixed by its external plate and in a movable fashion to the plate 62 of the body whilst the rocking lever 66 receives 75 fixed thereto in a movable manner by its external plates These jaws 74 and 75 which as in the embodiment previously smooth parallel jaw bit actuated by the multiplying gripping levers articulated between the external side include however certain modifications as compared with the jaws previously described In the jaws 74 and 75 the major arms of the gripping levers and are orientated one upwardly and the other wardly in the same way as are the levers c and These levers are articulated at their free extremities to one of the extremities of the articulated rods 7 and the other extremity of which is articulated the axes 77 and in the plates and Each of these clamping levers carries a lateral trunnion which is centered in the the little anas of the the trunnions engaging in pairs the lateral guide and harnessing plates and carried axially i the plates and and fixed at their free ends in a movable fashio on the bridles 72 and 69 of the auxiliary shafts 71 and 68 of the guide oables 80 and 81 are fixed at their free extremities between side plates and of the All the alterations permit on the one hand ing of the cable along the geometrica axis of the jaws the and on the other hand the opening and closing control of the bits by means of the coaxial efforts the jack and the The cylinder plates 61 and and the fixed partition 63 on the one hand and the piston 67 and 70 o the other divide the jack body 60 into five chambers and of variable volume which are through orifices 83 and 84 formed in the jack for the and by an orifice 85 formed in c the extremity of the hollow shaft 65 for the chamber Two rollers 86 near the centre of gravity of winch facilitate A fastening cable with two strands is at two extremities 88 to the body of the jack and be directed to right of the 89 so that winch A fluid distribution block fixed on the of the is connected external conduits 94 to orifices by a flexible conduit to orifice of the principal shaft and by a direct coupling to the orifice 81 of chamber A pilot valve 96 reversing the direction of motion is mounted in the base 61 of Jack 00 to be actuated at the end of its swinging lever course by the main piston 64 and the In each of the embodiments previously described winch comprises a hydraulic control circuit controlling s the movement of the 2 and circuit shown schematically 2 refers to the fourth embodiment described This circuit comprises a feed conduit 100 with a retaining valve a return oondult to the reservoir a distributor 103 having three positions so as to effect the reverse of the movements of the movable a 104 for hydraulic braking of the a control responsive to the pressure of the feed circuit 100 and a valve 105 for limiting the the distributor 103 occupies median rest position the feed circuit 100 is connected via 103 to the return circuit Whilst the distributor 103 one of its extreme positions the feed circui 100 supplies the drive chambers of the 10 via the valve the distributo 103 and the braking valve 104 maintained open by the pressure of the circuit whilst the chamber of the jack is connected via the distributor 103 to the return conduit Shis of the distributor causes the displacement of the 2 which drives the cable pulling the load in the event that it clamps the or eliding on the cable driving it in the event that its other extreme positio the distributor 103 causes the reversal the movement of the movable 2 whilst the fluid in the other chamber is discharged via the braking valve 104 and the distributor When movable retains the load which is moved backwards accelerating its movement 1 being the valve 104 commences its braking action as soon as the speed of the shaft becomes that of the rate of the feed circuit 100 sufficient to feed without pressur of the The hydraulic circuit shown schematically in 10 corresponds to the other embodiments of the winch previously In the hydraulic circuit the chambers of the jack which cause the driving are schematically illustrated by means of blocks A and whilst the chambers of the auxiliary control jack for opening and closing the jaws are schematically shown b the blocks C and The block 33 schematically shows a supplementar chamber which only exists in the fifth embodiment hydraulio circuit relevant to this last embodiment in comprises a feed conduit 110 with retaining valve discharging into a circuit 112 eeding the chamber distributor having two positions for the reversal of the movement of the movable a distributor 114 having two positions for the reversal of the movement of the valve a pilot valve controlling the and closing the valve a throttle valve 117 for limiting the throughput the valve a valve a pressure valve 119 for causing a oonetant drop in pressure between the chambers whilst the drive shaft of the movable returns the load being a compensating valve 120 connected to chamber B in the feed circuit 112 below a certain pressure obtaining in chamber a valve 121 for opening by controls so as to put into equilibrium the pressure on both faces of the auxiliary piston 70 with slight constant excess of pressure on the piston 70 in the chamber 23 towards the chamber a pressure limiting 122 for creating a slight between the retur circuit and the return conduit of the reservoir a throttle valve 125 ensuring constant feed at a very low rate the by the high pressure circuit 112 and finally a valve positions for the automatic control of the valve two the throttle valve 117 and the valve constitute a hydraulic braking device for the valve 11 a variable Whilst this valve is completely open it connects without braking the chamber A to the chaaber and in reverse it completel solates these i mediate positions valve 115 produces a laminatio of fluid rom A The pilo valve 116 having three passages two positions connects when it is at rest the control circuit of the valve 115 to chamber B via the throttle In second position the valve 116 connects the circuit to the return oircuit valve ensures the emptying of opening circuit 126 into the whilst the pressure in drops below a certain The passage the valve 116 from its position to its position is effected by the hydraulic oontrol fed by the The valve 115 only begins to open for a above in the pressure oircuit pressure of chamber necessar for the piloting at of the valve 116 is slightly greater than the pressure required opening the circuit 126 of the valve equilibrium valve 2 comprises a control of small section connected to the chamber of section connected to the circuit valve 121 which is closed at rest opens so as to connect the chamber 123 for a certain pressure in which it She compensation valve 120 hioh is open at assuring the connection of the circuit 112 with the distributors 113 114 thei position positions the chamber A is fed by the circuit the chamber connected to the circui 123 by the distributor 113 to the chamber C b distributor connections cause the return o the of the movable the of this by the i and 0 on the unequal sections of the piston and of the fixed b the pisto load She distributor 11 in its first position and distributor 113 i its second position the chamber connected to the feed circuit 110 via the distributor 113 end to the chamber via butor the putting under pressure of the chambers and causing the opening of the valve 115 by the oontrol circuit 126 and the evacuation of fluid o the chamber to chamber and the rapid withdrawal of the shaft whilst the cable retained by the During the course of the the 70 creates lowering of at causes the opening the compensation valve She distributor 114 being to its second and distributor 113 being brought to firs position the chamber is connected to the chamber Ώ via distributor 114 and to the circui 123 the distributor 113 whilst the is connected to the high 110 via the distributor the pressure reduction 119 and the distributor connections rise to a pressure in the chamber C which tends the bite the movable jaw if the latter retains the By virtue of reduction in pressure caused by the valve 119 between the chamber A and the chamber B the piston 64 and piston rod commences to withdraw carrying with the movable jaw which slides on the cable before the latter has completely the cable being therefore retained by the fixed distributors 113 and 114 being brought to thei second the chamber B is connected to the chamber B via distributor 114 to the feed circuit via the distributor 113 whilst the chamber C is oonnected to the circuit 123 via the distributor 114 distributor jaw retaining the the placing under pressure of the chambers B and D causes openin of the braking valve 115 without the latter causing the displacement of the main piston 64 after which the hydraulic control of the valve 116 cuts the control pressure of the valve 115 the latter closing after which takes place the opening of the fixed jaw whilst the movable jaw progressively grips the For a certain value of the pressure in B the complete declamplng of the fixed the valve 116 retains its rest the 115 opens and the in the chamber A flows towards the chamber B whilst the speed of return of the load Increases until the moment where the rates of flow of the circuit 110 becomes just sufficient to feed under pressure the chamber Tho valve 115 then ceases to ope and the speed of the load In this embodiment the distributor 113 can be controlled hydraulically in both senses the pilot valve 96 controlled mechanically at the end the stroke and manually in a region corresponding to the course of the shaft of the The hydraulic circuit relevant to the first three embodiments described above comprises solely the chambers 6 and comprising the feed circuit distributor the distribu tor the braking device the pilot valve 96 of the distributor 113 and a return clroult 124 without hydraulio connection between various elements the chambers the same as that described above with the exception of the two following Whilst the distributor 114 i in its first the chamber is to the return circuit via this sole distributor whatever the position of the distributor On the other hand the distributor 114 being in its position and the butor 113 being in its first position the chamber C is connected to the feed circuit 110 via the distributor 114 and the distributor It is understood that the invention is not limited to embodiments described above and shown in the drawings other embodiments can be conceived without departing from the scope of the insufficientOCRQuality

Claims (18)

1, A hydraulic win&h having two pairs of self-damping jaws, means for controlling the clamping and unclamping of the aws bits Of each pair of jaws characterized by at least one drive jack having a shaft, one pair o jaws being connected with the shaft of the drive jack to be movable thereby relative to the second pair of jaws, the second pair of jaws being stationary and arranged adjacent the end of the jack remote from the movable pair of jaws.

2. A winch according to Claim 1, characterised in that the shaft of the drive jack is hollow and the jack is so arranged as to permit a traction cable to pass coaxlally through it and through a central guide tube,

3· A winch accordin to Claim 1, characterised in that the device for controlling the opening and closing of the jaws is constituted by a double telesoopic rod system which operates at the stroke ends on release levers for opening and closing Of the jaw bits themselves articulated to the extremities of multiplying clamping levers of these jaws«

4· A xfinoh according to Claim 1, characterised in that the device for controlling the opening and closing of the jaws is constituted by an auxierliary hydraulio jack whose extremities are articulated to the multiplying levers for clamping the jaws.

5. A winch according to Claims 1 and 2» characterised in that the Jacks controlling, relative displacement of the jaws and the jacks controlling the opening and closing of the said jaws are located in a coaxial manner in the interior of the same jack body provided with pistons and hollow shafts*

6. A winch according to Claims 1 and 5. characterised in that an assembly of telescopic tubes connects the two jaws for the guidance of the cable.

7. A winch according to Claims 1 and 4» characterised in that a rod system is disposed in such a manner as to connect the opening control levers of the jaws so as to effect the simultaneous opening of the two jaws.

8. A winch according to Claims 1, 2, 5 and 6, characterised in that the jack bodies constitute two coaxial cylinders the one enclosing an auxiliary piston with its piston rod for controlling the opening and the pre-clamping of fixed jaw, the other enclosing an auxiliary piston with its piston rod controlling the opening and pre-clamping of the movable jaw and a main piston with its piston rod driving said movble jaw.

9· A winch according to Claim 1 and any one of Claims 2 to 8, characterised in that it comprises a » hydraulic circuit provided with a distributor for causing the reversal of movement of the load.

10. A winch according to Claims 1, 2, 5» 6, 8 and 9* characterised in that the hydraulic circuit is provided with opening valves controlled by the liquid pressure in the circuit in such manner as to establish a coun er-preesure of the auxiliary pistons and thereby effect the pre-clamping of the jaw bits.

11. A vinoh according to Claims 1, 2/ 5» 6 and 8 to 10, characterised in that the hydrauli© circuit is provided with a hydraulic braking valve for the load limiting the speed of said load when It is being driven.

12. A winch according to Claims 1» 2, 5» 6» 8» 9» 10 and 11, characterised in that the control of the braking valve of the load is responsive to the pressure in the feed circuit.

13. A winch according to Claims 1, 2, 5, 6 and Claims 8 to 12, characterised in that the control of the brake valve of the load is responsive to the pressure of deolamplng of the fixed Jaw via a pilot valve in such a manner as to maintain said jaw lightly clomping the cable during the course of braking of the load.

14. Λ winch according to Claims 1, 2, 5, β and Claims Θ to 13, characterised in tha the hydraulic circuit comprises a pressure reduction valve preventing the complete declamplng of the movable jaw whilst the load is being driven, said jaw returning to an empty state.

15. A winch according to Claim , characterised i that the winch jaws comprise multiplying levers for clamping which are disposed In pairs one above the other.

16. A winch according to Claims 1 and 15» characterised in that the points of articulation of the clamping levers of the gripping bits are guided so as to be displaceable alon the longitudinal axis of the jaws*

17. A winch according to Claim 1, characterised in that it is mounted in articulated fashion about an axis so as to be able to orientate freely in the direction of the load*

18. A winch substantially as hereinbefore described with reference to the accompanying drawings. Dated this 3rd day of February, 1965