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A device for attachment to both porous and non-porous wall surfaces includes a suction cup of a first type having an elastomeric core and an elastomeric outer layer that is substantially softer than the inner layer. The outer layer includes material that fills pores within a porous surface against w

A device for attachment to both porous and non-porous wall surfaces includes a suction cup of a first type having an elastomeric core and an elastomeric outer layer that is substantially softer than the inner layer. The outer layer includes material that fills pores within a porous surface against which the suction cup is held. The inner layer prevents tearing of the suction cup and causes a partial vacuum to be formed as the suction cup attempts to return to its original shape following depression against a wall surface. Alternately, the device may include a suction cup having a number of concentric ridges held against porous surface, with the suction cup being formed of a single elastomeric material or of elastomeric materials including a softer elastomeric outer layer.

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1. A suction cup comprising: a peripheral edge;an outward-facing surface having a concave central surface portion and an annular peripheral surface portion extending radially from the concave central surface portion to the peripheral edge, wherein the annular peripheral surface portion of the outwar

1. A suction cup comprising: a peripheral edge;an outward-facing surface having a concave central surface portion and an annular peripheral surface portion extending radially from the concave central surface portion to the peripheral edge, wherein the annular peripheral surface portion of the outward-facing surface includes a plurality of spaced-apart concentric ridges,a core composed of a first elastomer, forming a central structural portion, an annular structural peripheral portion, and a disk-shaped structural portion extending between the central structural portion and the annular peripheral structural portion of the suction cup; andan outer layer composed of a second elastomer, substantially softer than the first elastomer, wherein the outer layer forms at least the annular peripheral surface portion of the outward-facing surface, and wherein the outer layer additionally covers surfaces of the disk-shaped structural portion and of the central structural portion. 2. The suction cup of claim 1, wherein the second elastomer has a hardness in the range of Shore A 10 to Shore A 40. 3. The suction cup of claim 2, wherein the first elastomer has a hardness in the range of Shore A 50 to Shore A 70. 4. The suction cup of claim 1, wherein the outer layer has a thickness in the range of 0.8 mm to 1.8 mm. 5. A suction cup comprising: a peripheral edge;an outward-facing surface having a concave central surface portion and an annular peripheral surface portion extending radially from the concave central surface portion to the peripheral edge, wherein the annular peripheral surface portion of the outward-facing surface includes a plurality of spaced-apart concentric ridges, and wherein each of the spaced-apart concentric ridges has a height in a range of 0.2 mm to 1 mm and a width in a range of 0.8 mm to 2 mm;a core composed of a first elastomer, forming a central structural portion, an annular structural peripheral portion, and a disk-shaped structural portion extending between the central structural portion and the annular peripheral structural portion of the suction cup; andan outer layer composed of a second elastomer, substantially softer than the first elastomer, wherein the outer layer forms at least the annular peripheral surface portion of the outward-facing surface. 6. The suction cup of claim 5, wherein the second elastomer has a hardness in the range of Shore A 10 to Shore A 40. 7. The suction cup of claim 6, wherein the first elastomer has a hardness in the range of Shore A 50 to Shore A 70. 8. The suction cup of claim 5, wherein the outer layer has a thickness in the range of 0.8 mm to 1.8 mm. 9. Apparatus comprising a housing and a suction cup attached to the housing, wherein the suction cup includes: a peripheral edge;an outward-facing surface having a concave central surface portion and an annular peripheral surface portion extending radially from the concave central surface portion to the peripheral edge, wherein the annular peripheral surface portion of the outward-facing surface includes a plurality of spaced-apart concentric ridges, and wherein each of the spaced-apart concentric ridges of the suction cup has a height in a range of 0.2 mm to 1 mm and a width in a range of 0.8 mm to 2 mm,a core composed of a first elastomer, forming a central structural structural portion, an annular structural peripheral portion, and a disk-shaped structural portion extending between the central structural portion and the annular peripheral structural portion of the suction cup; andan outer layer composed of a second elastomer, substantially softer than the first elastomer, wherein the outer layer forms at least the annular peripheral surface portion of the outward-facing surface. 10. The apparatus of claim 9, wherein the apparatus additionally comprises an actuator, movably attached to the housing,the suction cup additionally comprises a core composed of a first elastomer, forming a central structural portion of the suction cup, an annular structural peripheral portion, and a disk-shaped structural portion extending between the central structural portion and the annular peripheral structural portion,the core is attached to the actuator,the housing includes a ring-shaped peripheral surface held in contact with the annular structural peripheral portion of the suction cup, andthe disk-shaped structural portion of the suction cup is deflected to increase a space within the concave central surface portion as the actuator is moved between a released position and an actuated position. 11. The suction cup of claim 9, wherein the second elastomer has a hardness in the range of Shore A 10 to Shore A 40. 12. The suction cup of claim 11, wherein the first elastomer has a hardness in the range of Shore A 50 to Shore A 70.