Fastener means for connecting a cylindrical body to a hub means

Claim 1

In a power brake apparatus having a wall means moved by a pneumatic pressure force and a piston means jointly moved by a hydraulic pressure force and said wall means to develop an output force, fastener means for connecting the piston means to the wall means; and fastener means comprising: cylindrical means having a first end secured to said piston means and a second end, said cylindrical means having an oval groove on the outer peripheral surface thereof and located adjacent the second end; hub means connected to said wall means, said hub means having an axial bore therein with a first slot and a second slot extending along the axial bore for a predetermined distance, said first slot having a first recess on the end thereof, said second slot having a second recess on the end thereof; and connecting means including a first clip means mounted in said oval groove of the cylindrical means and having a first tab located in said first recess and a second clip means mounted in said oval groove of the cylindrical means and having a second tab located in said second recess for connecting the cylindrical means to the hub means while allowing said cylindrical means a predetermined amount of linear movement with respect to said hub means to permit a reactionary force applied to the wall means from the piston means to be freely transmitted therethrough to resist an operator input force.

Claim 5

A method of connecting a wall moved by pneumatic differential pressure force to a piston jointly moved by a hydraulic force and the wall comprising the step of: placing an oval peripheral groove on one end of a cylindrical linkage member to create a major radial axis and a minor radial axis; attaching the other end of the cylindrical linkage member to said piston; placing a first yoke member on said oval peripheral groove; placing a second yoke member on said oval peripheral groove; aligning a first tab on the first yoke member and a second tab on the second yoke member in a plane with the minor radial axis on the oval peripheral groove in the cylindrical linkage member; aligning said first tab and said second tab with a corresponding first slot and a second slot in an axial bore in said wall; moving said cylindrical linkage member in said axial bore until said first tab and said second tab on the first and second yoke members are aligned with a first radial recess and a second radial recess adjacent to said axial bore in said wall; and rotating said cylindrical linkage member while holding said wall stationary causing said first yoke member and said second yoke member to move on said oval peripheral groove from the minor radial axis to the major radial axis and to position said first tab and second tab in the first recess and the second recess, respectively, and thereby establish a connection therebetween which allows limited linear motion while preventing a complete separation.

Claim 6

A method of connecting a wall moved by pneumatic differential pressure force to a piston jointly moved by a hydraulic force and the wall comprising the step of: placing an oval peripheral groove on one end of a cylindrical linkage member to create a major radial axis and a minor radial axis; attaching the other end of the cylindrical linkage member to said piston; placing a first yoke member on said oval peripheral groove; placing a second yoke member on said oval peripheral groove; aligning a first tab on the first yoke member and a second tab on the second yoke member in a plane with the minor radial axis on the oval peripheral groove in the cylindrical linkage member; aligning said first tab and said second tab with a corresponding first slot and a second slot in an axial bore in said wall; moving said cylindrical linkage member in said axial bore until said first tab and said second tab on the first and second yoke members are aligned with a first radial recess and a second radial recess adjacent to said axial bore in said wall; and rotating said cylindrical linkage member while holding said wall stationary causing said first yoke member and said second yoke member to move on said oval peripheral groove from the minor radial axis to the major radial axis and to position said first tab and second tab in the first recess and the second recess, respectively, and thereby establish a connection therebetween which allows limited linear motion while preventing a complete separation.