# US 2015/0145189 A1 · Shock-absorber and method for manufacturing a shock-absorber > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2015/0145189 A1 - Document ID: US20150145189A1 - Status: Published application - Kind: A1 - Application number: 14/550,695 - Filed: 2014-11-21 - Published: 2015-05-28 - Earliest claimed: 2013-11-22 - Assignees: Cikautxo, S.Coop. - Applicants: Cikautxo, S.Coop. - Inventors: Iñaki AZPIAZU ECHAVE - Web page: https://patentgrep.com/patent/US20150145189A1 ## CPC - F16F 3/093: the springs being of different materials, e.g. having different types of rubber {(F16F1/3835 takes precedence)} - B29C 70/68: by incorporating or moulding on preformed parts, e.g. inserts or layers {, e.g. foam blocks (mould constructions therefor B29C33/12; joining preformed parts by moulding B29C65/70)} - B29K 2021/003: {Thermoplastic elastomers} - B29K 2083/005: {LSR, i.e. liquid silicone rubbers, or derivatives thereof} - B29L 2009/00: Layered products - B29L 2031/721: {Vibration dampening equipment, e.g. shock absorbers (bumpers B29L2031/3044, springs B29L2031/774)} - F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS - B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES ## Abstract A shock-absorber suitable for joining a first component subjected to vibrations, such as a vehicle exhaust pipe, to a second component, such as a vehicle frame, and a method for manufacturing the shock-absorber. According to some implementations the shock-absorber is made of a first elastic material of a first density constituting a majority of the volume of the shock-absorber and a second elastic material of a second density less than the first density. The shock absorber includes a first area designed for being joined to the first component and a second area designed for being joined to the second component. The second elastic material at least partially covers the first area and is configured to at least partially contact the first component when the first component is assembled within the first area. ## Claims ### Claim 1 A shock-absorber for attaching a first component subjected to vibrations to a second component, the shock-absorber comprising: a first elastic material of a first density constituting a majority of the volume of the shock-absorber, a second elastic material of a second density less than the first density, a first area designed for being joined to the first component, the second elastic material at least partially covering the first area and configured to at least partially contact the first component; and a second area designed for being joined to the second component. ### Claim 2 (depends on 1) A shock-absorber according to claim 1, wherein the second density is less than or equal to 1 g/cm3. ### Claim 3 (depends on 2) A shock-absorber according to claim 2, wherein the sum of the first density and the second density is less than or equal to 2 g/cm3. ### Claim 4 (depends on 3) A shock-absorber according to claim 3, wherein the first elastic material is selected from the group consisting of: EPDM, natural rubber and thermoplastic. ### Claim 5 (depends on 2) A shock-absorber according to claim 2, wherein the second elastic material is selected from the group consisting of: silicone sponge, EPDM sponge and polyurethane sponge. ### Claim 6 (depends on 1) A shock-absorber according to claim 1, wherein the second elastic material is over-molded on the first elastic material. ### Claim 7 (depends on 3) A shock-absorber according to claim 3, wherein the second elastic material is over-molded on the first elastic material. ### Claim 8 (depends on 1) A shock-absorber according to claim 1, wherein the first area comprises a first opening configured to receive in a supporting fashion at least a portion of the first component, at least a part of the second elastic material being arranged inside the first opening so that when the shock-absorber is assembled with the first component the first component is only capable of making contact with the second elastic material. ### Claim 9 (depends on 1) A shock-absorber according to claim 1, wherein the first area comprises a first opening having a length and configured to receive in a supporting fashion at least a portion of the first component, at least a part of the second elastic material being arranged to cover an inner surface of the opening along substantially the entire length of the opening. ### Claim 10 (depends on 1) A shock-absorber according to claim 1, wherein the second area comprises a second opening configured to receive in a supporting fashion at least a portion of the second component, at least a part of the second elastic material being arranged inside the opening so that when the shock-absorber is assembled with the second component the second component is only capable of making contact with the second elastic material. ### Claim 11 (depends on 1) A shock-absorber according to any of claim 1, wherein the second area comprises a notch configured to receive in a supporting fashion at least a portion of the second component, at least part of the second elastic material being arranged inside the notch. ### Claim 12 (depends on 1) A shock-absorber according to claim 1, wherein a hollow area is disposed between the first area and the second area. ### Claim 13 (depends on 1) A shock-absorber according to claim 1, wherein an outer contour of the shock-absorber is formed by the first elastic material. ### Claim 14 (depends on 1) A shock-absorber according to claim 1, wherein the shock-absorber works under traction. ### Claim 15 (depends on 1) A shock-absorber according to claim 1, wherein the shock-absorber comprises an elongated shape comprising a longitudinal axis, at least part of the first area extending around the longitudinal axis. ### Claim 16 (depends on 15) A shock-absorber according to claim 15, wherein the second area is arranged in a direction substantially perpendicular to the longitudinal axis. ### Claim 17 (depends on 15) A shock-absorber according to claim 15, wherein the shock-absorber works under compression. ### Claim 18 (depends on 6) A shock-absorber according to claim 6, wherein the first area and/or the second area comprise at least one protuberance that increases an adhesion between the first and second elastic materials. ### Claim 19 (depends on 1) A method for manufacturing a shock-absorber according to claim 1 comprising: molding or extruding the first elastic material to form a first part of the shock-absorber, placing the first part in a cavity of a mold to function as an insert; and over-molding the second elastic material on at least a portion of the insert to form a second part of the shock-absorber. ### Claim 20 (depends on 19) A method according to claim 19, wherein over-molding the second elastic material on at least a portion of the insert comprises: forming a mixture by mixing a liquid base component of the second elastic material with a reagent; and pouring or injecting the mixture into the cavity of the mold where the insert has been previously placed. ### Claim 21 (depends on 20) A method according to claim 20, further comprising curing the mixture so that the mixture expands and fills the gap existing between the insert and the cavity of the mold. ### Claim 22 (depends on 20) A method according to claim 20, wherein a dye is added to the mixture before being poured or injected into the cavity of the mold.