Apparatus for effecting oscillatory movement of an output member

Claim 2

Apparatus for effecting oscillatory movement of an output member comprising: an output member mounted to undergo oscillatory movement; a pair of fluid reciprocatory motors each having a reciprocatory working member reciprocal through a working stroke and a return stroke and each receptive of motive fluid during use of the apparatus to effect synchronous reciprocation of both working members in opposite stroke directions; means for dampening the impact of each working member at the end of both its working and return strokes, said dampening means comprising means defining a pair of variable volume chambers in fluid communication with each other and each positioned adjacent one of said fluid reciprocatory motors, a viscous dampening fluid contained within each variable volume chamber, and means for effecting contraction of one variable volume chamber in response to movement of one working member during each return stroke thereof thereby forcing said viscous dampening fluid from said one variable volume chamber into the other variable volume chamber to effect expansion of same resulting in the dampening of each working member at the end of its corresponding stroke and for effecting contraction of said other variable volume chamber in response to movement of the other working member during each return stroke thereof thereby forcing said viscous dampening fluid from said other variable volume chamber into said one variable volume chamber to effect expansion of same resulting in the dampening of each working member at the end of its corresponding stroke; and means for effecting oscillatory Movement of said output member in response to synchronous reciprocation of both working members in opposite stroke directions.

Claim 3

Apparatus according to claim 1; wherein said last-mentioned means includes a flexible member in engagement with said output member operative to impart oscillatory movement to said output member in response to movement of said flexible member in opposite directions, and means connecting said flexible member to both working members to effect movement of said flexible member in opposite directions in response to synchronous reciprocation of both working members in opposite stroke directions.

Claim 4

Apparatus according to claim 2; wherein each fluid reciprocatory motor comprises a single-acting motor receptive of the motive fluid to actuate its working member through its working stroke; and wherein said means connecting said flexible member to both working members includes means responsive to the movement of each working member through its working stroke for simultaneously effecting movement of the other working member through its return stroke.

Claim 5

Apparatus according to claim 2; wherein said output member has a set of sprockets around the periphery thereof and said flexible member comprises a chain in meshing engagement with said sprockets, and wherein said means connecting said flexible member to both working members comprises a rotatable sprocket wheel connected to each working member and in meshing engagement with said chain whereby synchronous reciprocation of both working members in opposite stroke directions effects movement of said chain in opposite directions to thereby impart oscillatory movement to said output member.

Claim 6

Apparatus according to claim 1 including means defining a flow restriction between said pair of variable volume chambers to restrict the flow of viscous dampening fluid therebetween to increase the dampening effect.

Claim 7

Apparatus for effecting oscillatory movement of an output member comprising: an output member mounted to undergo oscillatory movement; a pair of fluid reciprocatory motors each having a reciprocatory working member reciprocal through a working stroke and a return stroke and each receptive of motive fluid during use of the apparatus to effect synchronous reciprocation of both working members in opposite stroke directions; dampening means for dampening the impact of each working member at the end of both its working and return strokes, said dampening means comprising a cylinder connected to each fluid reciprocatory motor, a piston slidable in each said cylinder defining therewith a variable volume chamber and having a rod portion engageable with the working member of the associated reciprocatory motor during each return stroke of said working member whereby movement of said working piston during its return stroke effects sliding movement of said piston in a direction to decrease the volume of said variable volume chamber, a conduit providing fluid communication between both variable volume chambers, and a viscous dampening fluid contained within said variable volume chambers and said conduit, whereby each working member during its return stroke engages with its associated piston and slides same in a direction to decrease the volume of one variable volume chamber and force the viscous dampening fluid therefrom through said conduit into the other variable volume chamber to increase the volume thereof and slide its associated piston into a position to engage with the other working member during its next return stroke thereby dampening the impact of each working member at the end of its stroke; and means for effecting oscillatory movement of said output member in response to synchronous reciprocation of both working members in opposite stroke directions.

Claim 8

Apparatus for effecting oscillatory movement of an output member comprising: an output member mounted to undergo oscillatory movement; a pair of fluid reciprocatory motors each having a reciprocatory working member reciprocal through a working stroke and a return stroke and each receptive of motive fluid during use of the apparatus to effect synchronous reciprocation of both working members in opposite stroke directions; dampening means for dampening the impact of each working member at the end of both its working and return strokes, said dampening means comprising a cylinder connected to each fluid reciprocatory motor, a piston slidable in each said cylinder defining therewith a variable volume chamber and having a rod portion engageable with the working member of the associated reciprocatory motor during each return stroke of said working member whereby movement of said working piston during its return stroke effects sliding movement of said piston in a direction to decrease the volume of said variable volume chamber, a conduit providing fluid communication between both variable volume chambers, and a viscous dampening fluid contained within said variable volume chambers and said conduit, whereby each working member during its return stroke engages with its associated piston and slides same in a direction to decrease the volume of one variable volume chamber and force the viscous dampening fluid therefrom through said conduit into the other variable volume chamber to increase the volume thereof and slide its associated piston into a position to engage with the other working member during its next return stroke thereby dampening the impact of each working member at the end of its stroke; and means for effecting oscillatory movement of said output member in response to synchronous reciprocation of both working members in opposite stroke directions.

Claim 9

Apparatus according to claim 6; including means defining a flow restriction between said pair of variable volume chambers to restrict the flow of viscous dampening fluid therebetween to increase the dampening effect.

Claim 10

Apparatus for effecting oScillatory movement of an output member comprising: an output member mounted to undergo oscillatory movement; a pair of fluid reciprocatory motors each having a reciprocatory working member reciprocal through a working stroke and a return stroke and each receptive of motive fluid during use of the apparatus to effect synchronous reciprocation of both working members in opposite stroke directions; dampening means for dampening the movement of each working member at the end of both its working and return strokes, said dampening means including means defining two dampening chambers in fluid communication with each other and receptive of a viscous dampening fluid during use of the apparatus and each positioned adjacent an end of one of said fluid reciprocatory motors, and means responsive to the movement of each working member as it approaches the end of its stroke which is adjacent its corresponding dampening chamber for pressurizing the dampening fluid contained therein and forcing it to the other dampening chamber; and means for effecting oscillatory movement of said output member in response to synchronous reciprocation of both working members in opposite stroke directions.

Claim 11

Apparatus for effecting oScillatory movement of an output member comprising: an output member mounted to undergo oscillatory movement; a pair of fluid reciprocatory motors each having a reciprocatory working member reciprocal through a working stroke and a return stroke and each receptive of motive fluid during use of the apparatus to effect synchronous reciprocation of both working members in opposite stroke directions; dampening means for dampening the movement of each working member at the end of both its working and return strokes, said dampening means including means defining two dampening chambers in fluid communication with each other and receptive of a viscous dampening fluid during use of the apparatus and each positioned adjacent an end of one of said fluid reciprocatory motors, and means responsive to the movement of each working member as it approaches the end of its stroke which is adjacent its corresponding dampening chamber for pressurizing the dampening fluid contained therein and forcing it to the other dampening chamber; and means for effecting oscillatory movement of said output member in response to synchronous reciprocation of both working members in opposite stroke directions.