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A piston-cylinder, pull type installation tool operable from a source of high hydraulic pressure for setting large diameter swage type fasteners including a pin and a collar by application of a relative axial force thereto with the tool having a pair of piston-cylinder combinations arranged in tande

A piston-cylinder, pull type installation tool operable from a source of high hydraulic pressure for setting large diameter swage type fasteners including a pin and a collar by application of a relative axial force thereto with the tool having a pair of piston-cylinder combinations arranged in tandem with both of the piston-cylinders being utilized to provide the pull force to swage the collar to the pin and with only one of the piston-cylinders being utilized to provide the collar ejection force to eject the collar from the tool and with at least some of the hydraulic porting being provided through the tandem piston construction.

대표청구항 ▼

In a fastening system for setting a fastener such as a lockbolt including a pin and a collar by applying a relative axial force between the pin and collar, said system comprising: an installation tool and a hydraulic power supply, said installation tool including a piston-cylinder assembly and a rem

In a fastening system for setting a fastener such as a lockbolt including a pin and a collar by applying a relative axial force between the pin and collar, said system comprising: an installation tool and a hydraulic power supply, said installation tool including a piston-cylinder assembly and a removable nose assembly, said piston-cylinder assembly comprising a one piece cylinder housing, said housing having an annular, radially extending separating wall located intermediate its ends and defining a forwardly opening cylinder cavity which is coaxially in line with a rearwardly opening cylinder cavity, said piston-cylinder assembly further comprising an annular closure member located at the front end of said forwardly opening cylinder cavity to define therewith a forward cylinder, said piston-cylinder assembly also comprising a tandem piston assembly including a first piston structure comprising a first piston head slidingly supported in said forward cylinder and integrally formed with a forwardly extending rod portion and a rearwardly extending rod portion, said forward rod portion slidingly supported in and extending through an opening in said closure member, said rearward rod portion slidingly supported in and extending through an opening in said separating wall, said tandem piston assembly further including a second piston structure comprising a second piston head secured to said rearwardly extending rod portion and slidably supported in said rearward cylinder cavity for reciprocal movement with said first piston structure, said first piston structure and said closure member defining a front cylinder portion in said forward cylinder, said first piston structure and said separating wall defining a rear cylinder portion in said forward cylinder, said second piston structure and said separating wall defining in said rearward cylinder cavity a rearward cylinder operative only on the side of said second piston head connected to said rearward rod portion, said rearward cylinder being the only fluid cylinder defined in said rearward cylinder cavity and operative on said second piston structure, said nose assembly including a plurality of jaws adapted to grip a pull portion of the pin and further including a swage anvil having a swage cavity adapted to engage the collar and to move over the collar and swage it radially inwardly onto the pin in response to a relative axial pull force between said jaws and said swage anvil as applied to the pin and collar, said swage cavity having a throat portion of a non-self releasing configuration, first means connecting said swage anvil to said cylinder housing and second means connecting said forward rod portion of said piston-cylinder assembly to said jaws, first fluid passage means in said piston-cylinder assembly for communicating said rearward cylinder and said front cylinder portion of said forward cylinder for simultaneously applying fluid pressure thereto from said hydraulic power supply to urge said first and second piston structures rearwardly to apply an axial pulling force to the fastener pin via said jaws and an axial reaction force to the collar via said swage anvil to set the fastener, said first fluid passage means including a first fluid inlet and a first passageway connected to said first fluid inlet, said first passageway extending through said rearward rod portion and said first piston head, second fluid passage means in said piston-cylinder assembly including a second fluid inlet for communication to said rear cylinder portion of said forward cylinder for applying fluid pressure thereto from said hydraulic power supply to urge said first piston structure forwardly to apply an axial pushing force to the end of the swaged fastener collar and an axial reaction force to said swage anvil to release the swaged collar from said swage cavity after the fastener has been set, said hydraulic power supply having a pull pressure section for providing hydraulic pressure of a first preselected magnitude to said piston-cylinder assembly, a return pressure section for providing hydraulic pressure of a second preselected magnitude to said piston-cylinder assembly, and a tank section for providing a reservoir for fluid to be returned from said piston-cylinder assembly, said hydraulic power supply including control valve means operable to a first condition for connecting said pull pressure section to said first fluid inlet of said piston-cylinder assembly for applying the relative axial pull force to set the fastener and for connecting said tank section to said second fluid inlet to receive fluid exhausted from said rear cylinder portion of said forward cylinder and operable to a second condition for connecting said return pressure section to said second fluid inlet of said piston-cylinder assembly for applying the relative axial pushing force for releasing the swaged collar from said swage cavity and for connecting said tank section to said first fluid inlet to receive exhausted fluid from said rearward cylinder and from said front cylinder portion of said forward cylinder, said second magnitude of hydraulic pressure being at least around 0.70 of said first magnitude of hydraulic pressure and with said relative axial pushing force being no less than around 0.30 of said relative axial pulling force.