Expansible chamber devices – Moving cylinder – Pivoted
Patent
1997-08-25
1999-05-18
Lopez, F. Daniel
Expansible chamber devices
Moving cylinder
Pivoted
92161, 16225, 16DIG13, F01B15/04
Patent
active
059040890
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an end mounting for a ram housing, and in particular, though not limited to an end mounting for a pneumatic or hydraulic ram housing.
Pneumatic and hydraulic rams, in general, comprise a housing, which typically, though not necessarily is of cylindrical construction and which is closed at respective opposite ends by end caps. A piston is slidable within the housing from end to end, and carries a piston rod which extends through one of the end caps. As the piston slides from end to end within the housing, the piston rod is extended from and retracted into the housing, respectively. In the case of a single acting ram, a single port is located at one end of the cylinder or in the end cap for delivering pneumatic or hydraulic fluid into the ram for urging the piston from one end to the other. A spring returns the piston. In a double acting ram a pair of ports are provided at respective opposite ends of the cylinder or in the end caps for delivering hydraulic or pneumatic fluid into the cylinder for urging the piston in respective opposite directions. Such rams will be well known to those skilled in the art.
Rams of the type described above have many uses. In general, they are anchored to two components of a structure or mechanism for urging the respective components towards and away from each other, or for pivoting thereof. In general, an end mounting is provided towards one end of the housing for mounting the housing of the ram to one of the components. Typically, the end mounting is secured to the end cap through which the piston rod does not project, in other words, to the closed end cap. The piston rod is connected to the other component. In many cases, it is essential that the housing of the ram should be pivotal relative to the component or structure to which the housing is mounted for facilitating pivoting of the housing relative to the structure as the piston cycles from end to end in the housing. This, in general, is achieved by provided a pivot coupling within the end mounting. Such end mountings, in general, comprise a mounting member which extends from the housing or end cap of the ram, typically, from the end cap. A U-shaped mounting bracket which embraces the mounting member, and which is pivotally connected to the mounting member by a clevis pin is provided for mounting to the component to which the ram housing is to be mounted. The clevis pin facilitates pivotal movement between the mounting bracket and the mounting member, and in turn, between the ram and the structure or component to which it is mounted. Circlips, typically secure the clevis pin in the mounting bracket and the mounting member.
Such end mountings, in general, are adequate for accommodating pivotal movement between a ram and the structure to which the ram is mounted in cases where the pivotal movement of the ram relative to the structure is relatively infrequent, and where the speed of pivotal movement required between the ram and the structure is relatively slow, in other words, where the frequency of cycling of the piston within the ram housing is relatively low, and where the cycle time of the piston within the ram housing is relatively long. However, such end mountings, in general, are inadequate where the piston is to cycle within the ram housing at rates in excess of ten cycles per second, and many cycles are required over the life of ram, for example, over one million cycles.
Additionally, because of the fact that such end mountings require so many components, and the fact that the mounting member and mounting bracket are in pivotal engagement with the clevis pin, wear occurs. Such wear can lead to three serious problems. Firstly, the ram may wobble from side to side relative to the structure to which it is mounted, while pivoting about the clevis pin as a result of play between the clevis pin, the mounting member and the mounting bracket. Secondly, and in many cases, more importantly, as a result of wear components may become detached from the end mounting, typically, the circlip and the
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patent: 4744494 (1988-05-01), Seager et al.
Jansson Claes Erick
Meagher Diarmuid Raymond
Moynihan Maurice Francis
Van Den Bergh Hugo Anthony
Lopez F. Daniel
Oseney Limited
Presta Frank P.
Presta Joseph S.
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