Internal shoe drum brakes

Claim 2

For the construction of a lever for a mechanical actuator linkage adapted to separate adjacent ends of a pair of brake shoes carrying friction linings for engagement with a rotatable drum, and at least one shoe having a radial web, the invention comprising a blank including a body portion of substantial length having first and and second opposite ends, said body portion adjacent to said first end having an opening adapted to receive a pivotal connection with said radial web of said one brake shoe and having at said second end a lug projecting from one side edge of said body portion and lying in the same plane as that of said body portion, and an opening formed in said lug and an adjacent part of said body portion includes portions of different dimensions of which one portion of said opening disposed at least in part in said lug is of parallel sided elongated outline of a width slightly greater than the diameter of a flexible inextensible member for moving said lever angularly about said pivotal connection and said other portion disposed within said body portion is of circular outline of a diameter slightly greater than the diameter of a boss at the free end of said flexible inextensible member.

Claim 3

For a mechanical actuator linkage for separating adjacent ends of a pair of brake shoes carrying friction linings for engagement with a rotatable drum, and at least one shoe having a radial web, the invention comprising a lever including a body portion of substantial length having first and second opposite ends, said body portion adjacent to said first end having an opening adapted to receive a pivotal connection with said radial web of said one brake shoe and having at said second end a lug projecting from one side edge of said body portion and lying in the same plane as that of said body portion, and an opening formed in said lug and an adjacent part of said body portion includes portions of different dimensions of which one portion of said opening disposed at least in part in said lug is of parallel sided elongated outline of a width slightly greater than the diameter of a flexible inextensible member for moving said lever angularly about said pivotal connection, and said other portion of said opening disposed within said body portion is of circular outline of a diameter slightly greater than the diameter of a boss at the free end of said inextensible member, wherein said lug is deformed through substantially 90* along a fold line traversing the said one portion of said opening to form an abutment part lying in a plane substantially parallel with a main longitudinal axis of said body portion, said abutment part forming an abutment for the inner end of said boss.

Claim 4

For a mechanical actuator linkage for separating adjacent ends of a pair of brake shoes carrying friction linings for engagement with a rotatable drum, and at least one shoe having a radial web, the invention comprising a lever including a body portion of substantial length having first and second opposite ends, said body portion adjacent to said first end having an opening adapted to receive a pivotal connection with said radial web of said one brake shoe and having at said second end a lug projecting from one side edge of said body portion and lying in the same plane as that of said body portion, and an opening formed in said lug and an adjacent part of said body portion includes portions of different dimensions of which one portion of said opening disposed at least in part in said lug is of parallel sided elongated outline of a width slightly greater than the diameter of a flexible inextensible member for moving said lever angularly about said pivotal connection, and said other portion of said opening disposed within said body portion is of circular outline of a diameter slightly greater than the diameter of a boss at the free end of said inextensible member, wherein said lug is deformed through substantially 90* along a fold line traversing the said one portion of said opening to form an abutment part lying in a plane substantially parallel with a main longitudinal axis of said body portion, said abutment part forming an abutment for the inner end of said boss.

Claim 5

In an internal shoe-drum brake comprising a stationary back plate, first and second arcuate brake shoes mounted on said back plate with at least one pair of ends adjacent each other, each shoe having a radial web and carrying a friction lining for engagement with a rotatable drum and a mechanical actuator for separating said adjacent ends of said shoes, said mechanical actuator comprising a pivotal connection between said first end of said lever and said radial web of said first shoe, a flexible inextensible brake applying member, a detachable coupling between said second end of said lever and said brake applying member, and a strut chordal with respect to the axis of rotation of said drum engaging at opposite Ends between said second shoe and an intermediate point in the length of said lever, the invention wherein said lever comprises a substantially flat body portion of substantial length formed at said second end with a lug lying in the same plane as that of said body portion and extending away from said drum from the side edge of said body portion remote from said drum, and said lug and an adjacent part of said body portion are provided with an opening which includes portions of different dimensions of which a first portion terminating at an end adjacent to said drum is of a diameter slightly greater than the diameter of a boss at the free end of said brake applying member, and a second portion of said opening disposed at least in part in said lug is of parallel sided elongated outline of a width slightly greater than the diameter of said brake applying member, wherein said lug is deformed with respect to said body portion through substantially 90* along a fold line traversing said second portion of said opening to form an abutment part lying in a plane substantially parallel with a main longitudinal axis of said body and having opposed faces of which one face, which lies adjacent to said drum, is engaged by the inner end of said boss for which it forms an abutment.

Claim 6

In an internal shoe-drum brake comprising a stationary back plate, first and second arcuate brake shoes mounted on said back plate with at least one pair of ends adjacent each other, each shoe having a radial web and carrying a friction lining for engagement with a rotatable drum and a mechanical actuator for separating said adjacent ends of said shoes, said mechanical actuator comprising a pivotal connection between said first end of said lever and said radial web of said first shoe, a flexible inextensible brake applying member, a detachable coupling between said second end of said lever and said brake applying member, and a strut chordal with respect to the axis of rotation of said drum engaging at opposite Ends between said second shoe and an intermediate point in the length of said lever, the invention wherein said lever comprises a substantially flat body portion of substantial length formed at said second end with a lug lying in the same plane as that of said body portion and extending away from said drum from the side edge of said body portion remote from said drum, and said lug and an adjacent part of said body portion are provided with an opening which includes portions of different dimensions of which a first portion terminating at an end adjacent to said drum is of a diameter slightly greater than the diameter of a boss at the free end of said brake applying member, and a second portion of said opening disposed at least in part in said lug is of parallel sided elongated outline of a width slightly greater than the diameter of said brake applying member, wherein said lug is deformed with respect to said body portion through substantially 90* along a fold line traversing said second portion of said opening to form an abutment part lying in a plane substantially parallel with a main longitudinal axis of said body and having opposed faces of which one face, which lies adjacent to said drum, is engaged by the inner end of said boss for which it forms an abutment.

Claim 7

For the construction of a lever for a mechanical actuator linkage adapted to separate adjacent ends of a pair of brake shoes carrying friction linings for engagement with a rotatable drum, and at least one shoe having a radial web, the invention comprising a blank including a body portion of substantial length having first and second opposite ends, said body portion adjacent to said first end having an opening adapted to receive a pivotal connection with said radial web of said one brake shoe and having at said second end a lug projecting from one side edge of said body portion and lying in the same plane as that of said body portion, and said lug and an adjacent part of said body portion comprise an integral extension formed by a pair of limbs, said limbs defining between adjacent edges an open-ended opening including an inner portion of a width slightly greater than the diameter of a flexible inextensible member for moving said lever angularly about said pivotal connection and an outer portion of a width slightly greater than the diameter of a boss at the free end of said flexible inextensible member.

Claim 8

For the construction of a lever for a mechanical actuator linkage adapted to separate adjacent ends of a pair of brake shoes carrying friction linings for engagement with a rotatable drum, and at least one shoe having a radial web, the invention comprising a blank including a body portion of substantial length having first and second opposite ends, said body portion adjacent to said first end having an opening adapted to receive a pivotal connection with said radial web of said one brake shoe and having at said second end a lug projecting from one side edge of said body portion and lying in the same plane as that of said body portion, and said lug and an adjacent part of said body portion comprise an integral extension formed by a pair of limbs, said limbs defining between adjacent edges an open-ended opening including an inner portion of a width slightly greater than the diameter of a flexible inextensible member for moving said lever angularly about said pivotal connection and an outer portion of a width slightly greater than the diameter of a boss at the free end of said flexible inextensible member.

Claim 9

The invention as claimed in claim 4, wherein portions of said edges of said limbs which define said inner portions of said opening are parallel with each other.

Claim 10

The invention as claimed in claim 4, wherein portions of said edge of said limbs which define said inner portions of said opening converge towards an end of said inner portion remote from said outer portion.

Claim 11

The invention as claimed in claim 6, wherein said edge portion of at least one of said limbs is formed at an intermediate point in its length with an inwardly extending portion having a straight inner face parallel with and spaced from a complementary face on said edge portion of said other limb.

Claim 12

For a mechanical actuator linkage for separating adjacent ends of a pair of brake shoes carrying friction linings for engagement with a rotatable drum, and at least one shoe having a radial web, the invention comprising a lever including a body portion of substantial length having first and second opposite ends, said body portion adjacent to said first end having an opening adapted to receive a pivotal connection with said radial web of said one brake shoe and having at said second end a lug projecting from one side edge of said body portion and lying in the same plane as that of said body portion, and an opening formed in said lug and an adjacent part of said body portion includes portions of different dimensions of which one portion of said opening disposed at least in part in said lug is of a width slightly greater than the diameter of a flexible inextensible member for moving said lever angularly about said pivotal coNnection, and said other portion of said opening is of dimensions slightly greater than those of a boss at the free end of said inextensible member, wherein said lug is deformed through substantially 90* along a fold line traversing the said one portion of said opening to form an abutment part lying in a plane substantially parallel with a main longitudinal axis of said body portion, said abutment part forming an abutment for the inner end of said boss.

Claim 13

For a mechanical actuator linkage for separating adjacent ends of a pair of brake shoes carrying friction linings for engagement with a rotatable drum, and at least one shoe having a radial web, the invention comprising a lever including a body portion of substantial length having first and second opposite ends, said body portion adjacent to said first end having an opening adapted to receive a pivotal connection with said radial web of said one brake shoe and having at said second end a lug projecting from one side edge of said body portion and lying in the same plane as that of said body portion, and an opening formed in said lug and an adjacent part of said body portion includes portions of different dimensions of which one portion of said opening disposed at least in part in said lug is of a width slightly greater than the diameter of a flexible inextensible member for moving said lever angularly about said pivotal coNnection, and said other portion of said opening is of dimensions slightly greater than those of a boss at the free end of said inextensible member, wherein said lug is deformed through substantially 90* along a fold line traversing the said one portion of said opening to form an abutment part lying in a plane substantially parallel with a main longitudinal axis of said body portion, said abutment part forming an abutment for the inner end of said boss.

Claim 14

The invention as claimed in claim 8, wherein the axis of the portion of the opening within the abutment part subtends an angle of at least 90* with respect to a plane containing said body portion, and said fold line is substantially normal to said main longitudinal axis of the portion of said opening at said second end of said body portion.

Claim 15

In an internal shoe-drum brake comprising a stationary back plate, first and second arcuate brake shoes mounted on said back plate with at least one pair of ends adjacent each other, each shoe having a radial web and carrying a friction lining for engagement with a rotatable drum and a mechanical actuator for separating said adjacent ends of said shoes, said mechanical actuator comprising a pivotal connection between said first end of said lever and said radial web of said first shoe, a flexible inextensible brake applying member,a detachable coupling between said second end of said lever and said brake applying member, and a strut chordal with respect to the axis of rotation of said drum engaging at opposite ends between said second shoe and an intermediate point in the length of said lever, the invention wherein said lever comprises a substantially flat body portion of substantial length formed at said second end with a lug lying in the same plane as that of said body portion and extending away from said drum from the side edge of said body portion remote from said drum, and said lug and an adjacent part of said body portion are provided with an opening which includes portions of different dimensions of which a first portion terminating at an end adjacent to said drum is of dimensions slightly greater than those of a boss at the free end of said brake applying member, and a second portion of said opening disposed at least in part in said lug is of a width slightly greater than the diameter of said brake applying member, wherein said lug is deformed with respect to said body portion through substantially 90* along a fold line traversing said second portion of said opening to form an abutment part lying in a plane substantially parallel with a main longitudinal axis of said body and having opposed faces of which one face, which lies adjacent to said drum, is engaged by the inner end of said boss for which it forms an abutment.

Claim 16

In an internal shoe-drum brake comprising a stationary back plate, first and second arcuate brake shoes mounted on said back plate with at least one pair of ends adjacent each other, each shoe having a radial web and carrying a friction lining for engagement with a rotatable drum and a mechanical actuator for separating said adjacent ends of said shoes, said mechanical actuator comprising a pivotal connection between said first end of said lever and said radial web of said first shoe, a flexible inextensible brake applying member,a detachable coupling between said second end of said lever and said brake applying member, and a strut chordal with respect to the axis of rotation of said drum engaging at opposite ends between said second shoe and an intermediate point in the length of said lever, the invention wherein said lever comprises a substantially flat body portion of substantial length formed at said second end with a lug lying in the same plane as that of said body portion and extending away from said drum from the side edge of said body portion remote from said drum, and said lug and an adjacent part of said body portion are provided with an opening which includes portions of different dimensions of which a first portion terminating at an end adjacent to said drum is of dimensions slightly greater than those of a boss at the free end of said brake applying member, and a second portion of said opening disposed at least in part in said lug is of a width slightly greater than the diameter of said brake applying member, wherein said lug is deformed with respect to said body portion through substantially 90* along a fold line traversing said second portion of said opening to form an abutment part lying in a plane substantially parallel with a main longitudinal axis of said body and having opposed faces of which one face, which lies adjacent to said drum, is engaged by the inner end of said boss for which it forms an abutment.

Claim 17

The invention as claimed in claim 10, wherein said lever is pivotally connected to said web of said first shoe on the side of said web adjacent to said back plate towards which said abutment part extends.

Claim 18

For a mechanical actuator linkage for separating adjacent ends of a pair of brake shoes carrying friction linings for engagement with a rotatable drum, and at least one shoe having a radial web, the invention comprising a lever including a body portion of substantial length having first and second opposite ends, said body portion adjacent to said first end having an opening adapted to receive a pivotal connection with said radial web of said one brake shoe and having at said second end a lug projecting from one edge of said body portion and lying in the same plane as that of said body portion, and said lug and an adjacent part of said body portion comprises an integral extension formed by a pair of limbs, said limbs defining between adjacent edges an open-ended opening including an inner portion of a width slightly greater than the diameter of a flexible inextensible member for moving said lever angularly about said pivotal connection and an outer portion of a width slightly greater than the diameter of a bOss at the free end of said inextensible member, wherein said lug is deformed through substantially 90* along a fold line traversing the said inner portion of said opening to form an abutment part lying in a plane substantially parallel with a main longitudinal axis of said body portion, said abutment part forming an abutment for the inner end of said boss.

Claim 19

For a mechanical actuator linkage for separating adjacent ends of a pair of brake shoes carrying friction linings for engagement with a rotatable drum, and at least one shoe having a radial web, the invention comprising a lever including a body portion of substantial length having first and second opposite ends, said body portion adjacent to said first end having an opening adapted to receive a pivotal connection with said radial web of said one brake shoe and having at said second end a lug projecting from one edge of said body portion and lying in the same plane as that of said body portion, and said lug and an adjacent part of said body portion comprises an integral extension formed by a pair of limbs, said limbs defining between adjacent edges an open-ended opening including an inner portion of a width slightly greater than the diameter of a flexible inextensible member for moving said lever angularly about said pivotal connection and an outer portion of a width slightly greater than the diameter of a bOss at the free end of said inextensible member, wherein said lug is deformed through substantially 90* along a fold line traversing the said inner portion of said opening to form an abutment part lying in a plane substantially parallel with a main longitudinal axis of said body portion, said abutment part forming an abutment for the inner end of said boss.

Claim 20

In an internal shoe-drum brake comprising a stationary back plate, first and second arcuate brake shoes mounted on said back plate with at least one pair of ends adjacent each other, each shoe having a radial web and carrying a friction lining for engagement with a rotatable drum and a mechanical actuator for separating said adjacent ends of said shoes, said mechanical actuator comprising a pivotal connection between said first end of said lever and said radial web of said first shoe, a flexible inextensible brake applying member, a detachable coupling between said second end of said lever and said brake applying member, and a strut chordal with respect to the axis of rotation of said drum engaging at opposite ends between said second shoe and an intermediate point in the length of said lever, the invention wherein said lever comprises a substantially flat body portion of substantial length formed at said second end with a lug lying in the same plane as that of said body portion and extending away from said drum from the side edge of said body portion remote from said drum, and said lug and an adjacent part of said body portion comprise an integral extension formed by a pair of limbs, said limbs defining between adjacent edges an open-ended opening including an outer portion terminating at an end adjacent to said drum of a width slightly greater than the diameter of a boss at the free end of said brake applying member, and an inner portion of a width slightly greater than the diameter of said brake applying member, wherein said lug is deformed with respect to said body portion through substantially 90* along a fold line traversing said inner portion of said opening to form an abutment part lying in a plane substantially parallel with a main longitudinal axis of said body and having opposed faces of which one face, which lies adjacent to said drum, is engaged by the inner end of said boss for which it forms an abutment.

Claim 21

In an internal shoe-drum brake comprising a stationary back plate, first and second arcuate brake shoes mounted on said back plate with at least one pair of ends adjacent each other, each shoe having a radial web and carrying a friction lining for engagement with a rotatable drum and a mechanical actuator for separating said adjacent ends of said shoes, said mechanical actuator comprising a pivotal connection between said first end of said lever and said radial web of said first shoe, a flexible inextensible brake applying member, a detachable coupling between said second end of said lever and said brake applying member, and a strut chordal with respect to the axis of rotation of said drum engaging at opposite ends between said second shoe and an intermediate point in the length of said lever, the invention wherein said lever comprises a substantially flat body portion of substantial length formed at said second end with a lug lying in the same plane as that of said body portion and extending away from said drum from the side edge of said body portion remote from said drum, and said lug and an adjacent part of said body portion comprise an integral extension formed by a pair of limbs, said limbs defining between adjacent edges an open-ended opening including an outer portion terminating at an end adjacent to said drum of a width slightly greater than the diameter of a boss at the free end of said brake applying member, and an inner portion of a width slightly greater than the diameter of said brake applying member, wherein said lug is deformed with respect to said body portion through substantially 90* along a fold line traversing said inner portion of said opening to form an abutment part lying in a plane substantially parallel with a main longitudinal axis of said body and having opposed faces of which one face, which lies adjacent to said drum, is engaged by the inner end of said boss for which it forms an abutment.