# US 2017/0280925 A1 · Coffee tamper > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0280925 A1 - Document ID: US20170280925A1 - Status: Published application - Kind: A1 - Application number: 15/513,084 - Filed: 2015-09-22 - Published: 2017-10-05 - Earliest claimed: 2014-09-22 - Assignees: Clockwork Espresso Ltd. - Applicants: Clockwork Espresso Ltd. - Inventors: Peter SOUTHERN - Web page: https://patentgrep.com/patent/US20170280925A1 ## CPC - A47J 31/44: Parts or details {or accessories} of beverage-making apparatus (filters or strainers A47J31/06) - A47J 31/00: Apparatus for making beverages (household machines or implements for straining foodstuffs A47J19/00; preparation of non-alcoholic beverages, e.g. by adding ingredients to fruit or vegetable juices, A23L2/00; coffee or tea pots A47G19/14; tea infusers A47G19/16; brewing of beer C12C; preparation of wine or other alcoholic beverages C12G) - A47J 31/3671: {Loose coffee being employed} - B30B 1/00: Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen - A47J: KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES - B30B: PRESSES IN GENERAL (producing ultra-high pressure or ultra-high pressure and high temperature to effect modifications of a substance, e.g. for making artificial diamonds B01J3/00 ){(compressing means for refuse receptacles B65F1/1405)} ## Abstract The invention relates to a coffee tamper. More specifically, the invention relates to a device for tamping coffee grounds in a basket or portafilter of an espresso machine, by which device a reproducible pressure is applied to the coffee grounds and which is designed to reduce occupational-related diseases among professional users, like e.g. baristas. ## Claims ### Claim 1 A coffee tamper, comprising: a circular punch unit and a top, wherein: said punch unit comprises a blind hole with an internal thread arranged in the center of the punch unit thereby forming a stay and a tamping surface on an opposite side of the blind hole, and said top comprises a circular recess corresponding to the stay of the punch unit and a post comprising an external thread corresponding to the internal thread of the punch unit, or wherein: said top comprises a blind hole with an internal thread arranged in the center of the top thereby forming a stay, and said punch unit comprises a circular recess corresponding to the stay of the top and a post comprising an external thread corresponding to the internal thread of the top, and wherein: said punch unit and said top are configured to be screwed together by the corresponding threads, wherein the outer diameter of the punch unit corresponds to the inner diameter of a basket or portafilter to receive coffee grounds, and wherein the outer diameter of the top is larger than the outer diameter of the punch unit thereby forming a rim when the top and the punch unit are screwed together, and wherein the top has an essentially flat handling surface. ### Claim 2 (depends on 1) The coffee tamper according to claim 1, wherein the top comprises at least one grub screw bore hole in which a grub screw can be screwed to retain the top relative to the punch unit and to avoid an unintended turn of the punch unit. ### Claim 3 (depends on 1) The coffee tamper according to claim 1, wherein the punch unit comprises a lip seal. ### Claim 4 (depends on 1) The coffee tamper according to claim 1, wherein the top comprises a lip seal. ### Claim 5 (depends on 1) The coffee tamper according to claim 1, wherein the top comprises chamfered edges. ### Claim 6 (depends on 1) The coffee tamper according to claim 1, wherein the punch unit is made of one of stainless steel, brass, anodized or hard anodized aluminum, and food grade polymers. ### Claim 7 (depends on 1) The coffee tamper according to claim 1, wherein the top comprises an indication means to indicate a contact of the rim of the coffee tamper with the rim of the basket or portafilter. ### Claim 8 (depends on 7) The coffee tamper according to claim 7, wherein the indication means indicates the contact by an acoustic and/or haptic signal. ### Claim 9 (depends on 7) The coffee tamper according to claim 7, wherein the indication means is a mechanical means. ### Claim 10 (depends on 1) The coffee tamper according to claim 1, wherein the tamping surface has a convex contour, a concave contour, or a flat contour. ### Claim 11 (depends on 1) The coffee tamper according to claim 1, wherein the punch unit comprises at least one groove in the outer side wall. ### Claim 12 (depends on 11) The coffee tamper according to claim 11, wherein U is the circumference of the punch unit and the unit comprises two grooves each having a length of ¼ U and which are equally spaced and arranged along the circumference. ### Claim 13 (depends on 1) The coffee tamper according to claim 1, wherein the coffee tamper comprises a notch mechanism for retention of the punch unit by an incremental mechanism. ### Claim 14 (depends on 13) The coffee tamper according to claim 13, wherein the notch mechanism comprises a spring load and indentations. ### Claim 15 (depends on 13) The coffee tamper according to claim 13, wherein the notch mechanism comprises at least one spring loaded ball pin cartridge arranged in a blind hole.