Shaft seal

Claim 2

A seal for sealing between a housing bore and a rotating and reciprocating shaft extending through the housing bore, said seal comprising: a. an annular metal case formed as a single element and having a cylindrical portion adapted to press-fit in said bore, b. an elastomeric shaft seal bonded to said case and in sealing contact with said shaft, and c. an elongated, axially collapsible, shaft encircling, elastomeric sleeve connected to said case and extending axially outwardly from said housing and having a distal end in light contact with said shaft, said sleeve including an enlarged bead at its proximal end adjacent said case, said bead being mechanically crimped in a bead-retaining portion of said case including a bead-retaining groove, and said bead-retaining portion of said case extending radially and axially outwardly from said cylindrical portion.

Claim 5

An apparatus according to claim 2 wherein said cylindrical portion of said metal case includes a pair of adjacent, concentric cylindrical elements, said bead-retaining poRtion being formed by axially outer extensions of said pair of elements, and with the extension of the outer cylindrical element including a radially outwardly directed abutting flange for contacting said housing to locate said seal therein.

Claim 6

In a seal for sealing between a housing bore and a rotating and reciprocating shaft extending through said bore, and including a metal case press-fitted into said bore and supporting a lip seal bonded to said base and in rotary contact with said shaft, and also supporting an elongated shaft-encircling, axially collapsible, sleeve extending axially outwardly from said housing and having a distal end in light rotating and reciprocating contact with said shaft, the improvement wherein said metal case includes a cylindrical portion adapted to be fitted into said bore, a radially inwardly extending portion to which said lip seal is bonded, and a bead-retaining portion defining an annular groove for receiving an enlarged annular bead at the proximal end of said sleeve, said bead-retaining portion including an outer flange crimped over said bead for holding said bead in said groove, said bead-retaining portion positioned completely axially outwardly from said cylindrical portion received in said housing bore, and said bead-retaining portion extending radially outwardly from said cylindrical portion and including a radially outwardly extending abutting flange for contacting said housing for defining the location of said metal case in said housing.

Claim 7

In a seal for sealing between a housing bore and a rotating and reciprocating shaft extending through said bore, and including a metal case press-fitted into said bore and supporting a lip seal bonded to said base and in rotary contact with said shaft, and also supporting an elongated shaft-encircling, axially collapsible, sleeve extending axially outwardly from said housing and having a distal end in light rotating and reciprocating contact with said shaft, the improvement wherein said metal case includes a cylindrical portion adapted to be fitted into said bore, a radially inwardly extending portion to which said lip seal is bonded, and a bead-retaining portion defining an annular groove for receiving an enlarged annular bead at the proximal end of said sleeve, said bead-retaining portion including an outer flange crimped over said bead for holding said bead in said groove, said bead-retaining portion positioned completely axially outwardly from said cylindrical portion received in said housing bore, and said bead-retaining portion extending radially outwardly from said cylindrical portion and including a radially outwardly extending abutting flange for contacting said housing for defining the location of said metal case in said housing.

Claim 8

An apparatus according to claim 4 wherein said sleeve tapers in thickness from a larger thickness adjacent each end to a smaller thickness intermediate the ends.

Claim 9

An apparatus according to claim 5 wherein said cylindrical portion of said metal case includes a pair of adjacent, concentric cylindrical elements, said bead-retaining portion being formed by axially outer extensions of said pair of elements, and with the extension of the outer cylindrical element including a radially outwardly directed abutting flange for contacting said housing to locate said seal therein.

Claim 10

A seal for sealing between a housing bore and a rotating and reciprocating shaft extending through the housing bore, said seal comprising: a. an annular metal case including: i. a cylindrical portion adapted to fit in leak tight engagement with a housing bore through which said drive shaft extends, ii. a radially inwardly extending flange portion connected to said cylindrical portion, and iii. an annular bead-retaining groove positioned axially outwardly from said housing beyond said cylindrical portion, b. an elastomeric shaft seal bonded to said flange and adapted to provide rotary sealing contact with said shaft, and c. a hollow cylindrical, shaft encircling sleeve seal connected to said case and extending axially outwardly therefrom away from said housing, said sleeve including: i. an enlarged bead at the end thereof connected to said case, ii. a hollow cylindrical section connected to said bead, iii. a hollow conical section connected to said cylindrical section, iv. an enlarged end portion connected to the conical section and having an annular groove therein, v. said sections tapering in thickness from a larger thickness adjacent their outer ends to a thinner thickness at their meeting, vi. an annular ring of hard material positioned in said groove and bonded thereto, and d. said case being crimped around said bead for holding said bead in said groove.

Claim 11

A seal for sealing between a housing bore and a rotating and reciprocating shaft extending through the housing bore, said seal comprising: a. an annular metal case including: i. a cylindrical portion adapted to fit in leak tight engagement with a housing bore through which said drive shaft extends, ii. a radially inwardly extending flange portion connected to said cylindrical portion, and iii. an annular bead-retaining groove positioned axially outwardly from said housing beyond said cylindrical portion, b. an elastomeric shaft seal bonded to said flange and adapted to provide rotary sealing contact with said shaft, and c. a hollow cylindrical, shaft encircling sleeve seal connected to said case and extending axially outwardly therefrom away from said housing, said sleeve including: i. an enlarged bead at the end thereof connected to said case, ii. a hollow cylindrical section connected to said bead, iii. a hollow conical section connected to said cylindrical section, iv. an enlarged end portion connected to the conical section and having an annular groove therein, v. said sections tapering in thickness from a larger thickness adjacent their outer ends to a thinner thickness at their meeting, vi. an annular ring of hard material positioned in said groove and bonded thereto, and d. said case being crimped around said bead for holding said bead in said groove.

Claim 12

An apparatus according to claim 7 wherein said cylindrical portion includes a pair of adjacent, concentric cylindrical elements with said bead-retaining portion being defined therebetween and with an abutting flange formed from the outer cylindrical element and with the inner cylindrical element extending axially outwardly beyond said abutting flange and defining a portion of said groove, said abutting flange adapted to contact said housing to locate said seal therein.