QUICK-COUPLING ASSEMBLY

Abstract: A quick-coupling assembly for attachment of a tool to a working machine, whereat there is in the tool at least one pair of fixing sleeves (2) for mounting into them pins that fasten the tool and working machine together and each pair of sleeves has a counter pair of fulcrum pins fixed to the working machine and formed of two pins (6) mounted facing each other and most suitably inside the tubular body (1) and movable by hydraulic pressure lengthwise out of body and back into body. Both pins are fastened with bearings to rotate in regard to the body at least with the pins in ejected position and the assembly includes a blocking system to prevent pin rotation in regard to sleeve pair (2).

Description: QUICK-COUPLING ASSEMBLY The invention relates to a quick-coupling assembly presented in the preamble of patent claim 1. Previously known is a quick-coupling assembly for attachment of scoops, bulldozer blades or other tools to a working machine e.g. from publication WO 95/21969. In the publication a connecting piece adapted to the working machine boom top is presented, which has a cylindrical body and where out of the body ends pins protrude by means of hydraulic pressure. The pins are retractred also by pressure. At least one of the protruding pins is the cylinder of the hydraulic cylinder, by means of which the pin movements are produced. The advantage of the solution is that the outer surfaces of the protruding pins are not faces that can be tightened against hydraulic pressure, so that possible damages in the long run are of no importance for the function. However, the disadvantage of this solution is that the protruding pin strives to rotate and usually even always rotates in the sleeve of the tool, for instance a the scoop, when the scoop is rotated. So, if the scoop sleeve is used as a bearing, almost unshielded so that dirt an stones can get onto the sliding surface, the fit of pin and sleeve will soon become loose. A loose fit causes bending forces in the pin and the quick-contact assembly will not be reliable any more. By means of the quick-contact assembly as per this invention these disadvantages are resolved and the invention is characterized in what is presented in the enclosed patent claims. The advantages of this invention are that the protruding pin does not rotate in the tool sleeve, since fastening with bearings is arranged within the assembly, where necessary bearings can be placed into protected space. The aim has been to prevent the pin to rotate anymore in the sleeve. The pins are pressed by hydraulic power all the time in protruded state. In this way the pin joint is stiffened especially if the pin is made sligtly conical and, correspondingly, the sleeve of the tool a cone. The tool is then free from backlash, but by means of the rotating pin attached to boom of the working machine. Sufficient support against bending and other forces is achieved. Further, fitting the quick-coupling by control from the cabin, the conical shape of pin and sleeve remarkably helps to make the protruding pins to hit the working machine sleeves. In the following the invention is disclosed with reference to the enclosed drawing, where Fig. 1 is a section of the hydraulic quick-mounting assembly with bearings and scoop counter parts. Fig. 2 is a section of another embodiment of the hydraulic quick-mounting assembly fastened with bearings. Figure 1 shows an assembly for attachment to the top of an excavator boom and having a tube 1 as its body. Within the body there are pins 6 hydraulically movable in and out. Pins 6 are sleeves, as hydraulic cylinders, whereby they slide on the piston rod that supports them from the inside. Pressure oil is conducted along channels 7 to move pins 6 in and out by means of piston 11 and, on the other hand, to keep the pins tense as long as the attachment by pins is retained. On the tool side there is , for instance, a sleeve 2 welded to the scoop, pressed in its hole there is an inner sleeve 5 with conical surface, whose rotation in the sleeve is also prevented using, for instance, the attachment and screws 4 of the shielding plate that covers the sleeve rear portion. Within body 1 is the fastening with bearings 10 for pins 6 when protruded. Lubrication is arranged over nipples 8 and retaining bearing sleeves 10 secured by locking screws 9. Wedging out pins 6 by the power of hydraulic pressure and the sleeves 5 restricting the ejection of pins, the attachment can be made free of backlash and rotating the scoop to rotate pins 6, whereby they rotate in respective bearings 10 and in body 1. Figure 2 is the same solution on the tool side as in figure 1, but inside body 1 the fastening with bearings is changed to a conical roller bearing 14,15. Also a small portion of roller bearing 13 is for pin 6, as well as nipple 8. Conical roller bearing 14,15 takes the ejection of pin 6 and stops the axial movement of pin 6. One strives to produce a construction, where the cone joint between pin 6 and sleeve 5 would also stop the movement of pin 6 si ultan-eously with the roller bearing. By this arrangement the quick-contact would also become free of backlash and the pins well supported against bending and the pins would not rotate in their box in body 1 in loading situation. The position of conical sleeve can be adjusted by fitting regulator plates in top of sleeve 5 and the sleeve forced against body 1 by tightening screws 4. Pins 6 are sleeves, where the other end is plugged by a screw plug. In this pin 6 end there can also be groove or a bulge or a cavity and respectively there is, for instance, in the not- rotation shield plate 3 of sleeve 2 a corresponding shape, whereby when the pin protrudes out of the body the said shapes come in contact preventing pin 6 from rotating in regard to sleeve 2 and sleeve 5. On the other hand also the ejection power retained all the time pushes the pin by such force against sleeve 5 conical face that there is sufficient friction to prevent the pin from rotating. Between body 1 and pin 6 it is possible to use even other known ways of fastening the bearings.

Claims: CLAIMS 4 l.A quick-coupling assembly for attachment of a tool to a working machine, whereby there is in the tool at least one pair of fixing sleeves (2) for mounting into them pins that fasten the tool and working machine together and each pair of sleeves has a counter pair of fulcrum pins fixed to the working machine and formed of two pins (6) mounted facing each other and most suitably inside the tubular body 1 and movable by hydraulic pressure lengthwise out of body (1) and back into body (1), c h a r a c t e r i z e d in that both pins (6) are fastened with bearings to rotate in regard to body (1) at least with pins (6) in ejected position and the assembly having a blocking system to prevent pin (6) rotation in regard to sleeve (2). 2. A quick-coupling assembly according to claim 1 c h a r a c t e r i z e d in that the counter face of both pin (6) and sleeve (2) is a cone. 3. A quick-coupling assembly according to claim 1 or 2 c h a r a c t e r i z e d in that the assembly includes an arrangement for retaining the effect of power caused on pins (6) while these pins (6) are ejected. 4. A quick-coupling assembly according to any of the above claims 1 - 3 c h a r a c t e r i z e d in that in the assembly the inner cone face of sleeve (2) works a restrictor of pin (6) ejection. 5. A quick-coupling assembly according to any of the above claims 1 - 3 c h a r a c t e r i z e d in that fastening of pin (6) with bearings (14,15) works a restrictor of pin (6) ejection. 6. A quick-coupling assembly according to any of the above claims 1 - 5 c h a r a c t e r i z e d in that in order to prevent pin rotation in sleeve (2) the assembly includes a system to retain power that pushes pin (6) against the cone face of the sleeve. 7. A quick-coupling assembly according to any of the above claims 1 - 3 c h a r a c t e r i z e d in that rotation of pin (6) inside sleeve (2) is prevented by a groove, a bulge or correspond-ing shaped in pin (6) which shape has a non-rotating counter face in the rear portion of sleeve (2), e.g. in shielding plate (3) . assembly includes a system to maintain power pushing the pin (6) against the cone face of the sleeve.

Inventors: RAUNISTO YRJOE, RAUNISTO, YRJOE
Applicants: RAUNISTO AIRI, RAUNISTO YRJOE, RAUNISTO, AIRI, RAUNISTO, YRJOE
Application year: 2000
Main classification: E02F3
IPC codes: E02F3, E02F9