# US 5,347,714 A · Movable blade shaving cartridge > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,347,714 A - Document ID: US5347714A - Status: Granted - Kind: A - Application number: 08/019,290 - Filed: 1993-02-18 - Granted: 1994-09-20 - Earliest claimed: 1993-02-18 - Assignees: American Safety Razor Company - Inventors: Frank H. Prochaska - Web page: https://patentgrep.com/patent/US5347714A ## CPC - B26B 21/38: with provision for reciprocating the blade by means other than rollers (reciprocating the cutting elements of clippers or dry shavers B26B19/00) - B26B 21/227: {with blades being resiliently mounted in the changeable unit} - B26B: HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR (for harvesting A01D; for horticulture, for forestry A01G; for butchering or meat treatment A22; for manufactering or repairing footwear A43D; nail clippers or cutters A45D29/02; kitchen equipment A47J; {vegetable slicers, julienne cutters and similar devices and holders therefor, B26D3/28}; for surgical purposes A61B; for metal B23D; cutting by abrasive fluid jets B24C5/02; plier-like tools with cutting edges B25B7/22; pincers B25C11/02; handles for hand implements, in general B25G; guillotine-type cutters B26D; {perforating by non-mechanical means, e.g. by fluid jet, B26F1/26}; for erasing B43L19/00; for textile materials D06H) ## Abstract A razor head comprises a body portion defining a guard and a cap, and a blade assembly having a blade disposed therein. The blade assembly is mounted by a first and second mounting member to the body portion in relation to the guard and cap in a manner to comprise a four-bar linkage. The body portion defines a stationary member of the four-bar linkage. The first and second mounting members each have one end connected to the body portion in a manner to define rotational members of the four-bar linkage about a separate axis of rotation for each of the first and second mounting members. The blade assembly is connected to the other end of the first and second mounting members to define a movable four-bar member responsive to rotational movement of the first and second mounting members so that shaving forces acting upon the blade assembly cause the blade assembly to move relative to the body portion. ## Claims ### Claim 1 A razor head comprising a body portion defining a guard and a cap, and a blade assembly having a blade disposed therein, said blade assembly mounted by a first and second mounting member to said body portion in relation to said guard and cap in a manner to comprise a four-bar linkage, wherein said body portion defines a stationary member of said four-bar linkage, said first and second mounting members each having one end integrally connected to said body portion in a manner to define rotational members of said four-bar linkage about a separate axis of rotation for each of said first and second mounting members; and said blade assembly integrally connected to the other end of said first and second mounting members thereto to define a movable four-bar member responsive to rotational movement of said first and second mounting members so that shaving forces acting upon said blade assembly cause said blade assembly to move relative to said body portion. ### Claim 2 (depends on 1) The invention of claim 1, wherein a plurality of said mounting members connect said blade assembly to said body portion, said mounting members comprising double cantilever springs supporting a plurality of blade seats formed on said body portion to receive said blade. ### Claim 3 (depends on 2) The invention of claim 2, wherein at least four pairs of first and second mounting members affix said blade assembly to said body portion. ### Claim 4 (depends on 1) The invention of claim 1, wherein said four-bar linkage causes the angle of the blade in said blade assembly to become either more or less aggressive in response to shaving forces acting upon said blade assembly. ### Claim 5 (depends on 1) The invention of claim 1, wherein said four-bar linkage causes the blade in said blade assembly to move away either by rotational or translational movement from the shaving forces acting upon said blade. ### Claim 6 (depends on 1, 3, 4) The invention of claims 1, 3, 4, or 5, wherein said first and second mounting members define varying resilient characteristics between said body portion and blade assembly. ### Claim 7 (depends on 1) The invention of claim 1, wherein at least one of said mounting members includes first and second elements defining a second axis of rotation for said mounting member in manner that said body portion, said blade assembly and said first and second mounting members comprising a five-bar linkage. ### Claim 8 (depends on 7) The invention of claim 7, wherein said first and second elements of said mounting member define first and second elements having unequal radii of rotation. ### Claim 9 (depends on 7) The invention of claim 7, wherein said first and second elements of said mounting member defines one of said elements affixed to said body portion to define an axis extending beyond said body portion, and the other of said second elements defining an axis within said body portion. ### Claim 10 (depends on 1) The invention of claim 1, wherein said blade assembly includes said cap, said cap defining a lower engagement surface disposed to engage an opposed upper surface formed on said body portion which controls the limit of translational and rotational movement of said blade assembly in response to shaving forces. ### Claim 11 (depends on 1) The invention of claim 1, wherein said blade assembly includes a first and second blade. ### Claim 12 (depends on 11) The invention of claim 11, wherein said blade assembly includes a spacer affixed between said first and second blades. ### Claim 13 (depends on 1) The invention of claim 1, wherein said guard and cap are disposed at opposite sides of said body portion. ### Claim 14 (depends on 1) The invention of claim 1, wherein said razor head additionally comprises a shaving aid. ### Claim 15 (depends on 14) The invention of claim 14, wherein said shaving aid defines a lubrication strip located near said cap, said shaving aid comprising a matrix of polystyrene, and polyethylene oxide. ### Claim 16 (depends on 1) The invention of claim 1, wherein said guard includes means to allow independent movement of said guard in a direction away from the direction of shaving forces acting upon said guard. ### Claim 17 (depends on 1) The invention of claim 1, wherein said cap includes means to allow independent movement of said cap in a direction away from the direction of shaving forces acting upon said cap. ### Claim 18 A razor comprising a razor head connected to a handle, said razor head including a body portion defining a guard and a cap, and a blade assembly having a blade disposed therein, said blade assembly mounted by first and second mounting members to said body portion in relation to said guard and cap in a manner to comprise a four-bar linkage, wherein said body portion defines a stationary member of said four-bar linkage, said first and second mounting members each having one end integrally connected to said body portion in a manner to define rotational members of said four-bar linkage about a separate axis of rotation for each of said first and second mounting members; and said blade assembly integrally connected to the other end of said first and second mounting members thereto to define a movable four-bar member responsive to rotational movement of said first and second mounting members so that shaving forces acting upon said blade assembly cause said blade assembly to move relative to said body portion. ### Claim 19 (depends on 18) The invention of claim 18, wherein said handle is detachably connected to said razor head. ### Claim 20 (depends on 18) The invention of claim 18, wherein said handle is permanently connected to said razor head. ### Claim 21 (depends on 18) The invention of claim 18, wherein a plurality of said mounting members connect said blade assembly to said body portion, said mounting members comprising double cantilever springs supporting a plurality of blade seats formed on said body portion to receive said blade. ### Claim 22 (depends on 18) The invention of claim 18, wherein said four-bar linkage causes the angle of the blade in said blade assembly to become either more or less aggressive in response to shaving forces acting upon said blade assembly. ### Claim 23 (depends on 18) The invention of claim 18, wherein said four-bar linkage causes the blade in said blade assembly to move away from the shaving forces acting upon said blade. ### Claim 24 (depends on 18, 19, 20, 21, 22, 23) The invention of claims 18, 19, 20, 21, 22 or 23, wherein said first and second mounting members define varying resilient characteristics between said body portion and said blade assembly. ### Claim 25 (depends on 19) The invention of claim 19, wherein at least one of said mounting members includes first and second elements defining a second axis of rotation for said mounting member in manner that said body portion, said blade assembly and said first and second mounting members comprise a five-bar linkage. ### Claim 26 (depends on 25) The invention of claim 25, wherein said first and second elements of said mounting member define first and second elements having unequal radii of rotation. ### Claim 27 (depends on 19) The invention of claim 19, wherein said blade assembly includes a first and second blade. ### Claim 28 (depends on 27) The invention of claim 27, wherein said blade assembly includes a spacer affixed between said first and second blades. ### Claim 29 (depends on 28) The invention of claim 28, wherein said guard and cap are disposed at opposite sides of said body portion. ### Claim 30 (depends on 19) The invention of claim 19, wherein said razor head additionally comprises a shaving aid. ### Claim 31 (depends on 30) The invention of claim 30, wherein said shaving aid defines a lubrication strip located near said cap. ### Claim 32 (depends on 19) The invention of claim 19, wherein said guard includes means to allow independent movement of said guard in a direction away from the direction of shaving forces acting upon said guard. ### Claim 33 (depends on 19) The invention of claim 19, wherein said cap includes means to allow independent movement of said cap in a direction away from the direction of shaving forces acting upon said cap. ### Claim 34 (depends on 19) The invention of claim 19, wherein said first and second elements of said mounting member defines one of said elements affixed to said body portion to define an axis extending beyond said body portion, and the other of said second elements defining an axis within said body portion. ### Claim 35 (depends on 19) The invention of claim 19, wherein at least eight mounting members affix said blade assembly to said body portion. ### Claim 36 (depends on 19) The invention of claim 19, wherein said razor head defines a pivot connection allowing said razor head to pivot about the handle in response to shaving forces. ### Claim 37 (depends on 36) The invention of claim 36, wherein said pivot connection includes a bias member allowing said razor head to return to an original position in the absence of shaving forces. ### Claim 38 A body portion for a blade cartridge comprising a cartridge platform mounted to said body portion by a first and second mounting member in a manner to comprise a four-bar linkage, wherein said body portion defines a stationary member of said four-bar linkage, said first and second mounting members each having one end integrally connected to said body portion in a manner to define rotational members of said four-bar linkage about a separate axis of rotation for each of said first and second mounting members; and said cartridge platform integrally connected to the other end of said first and second mounting members thereto to define a movable four-bar member responsive to rotational movement of said first and second mounting members so that shaving forces acting upon said cartridge platform cause said cartridge platform to move relative to said body portion. ### Claim 39 (depends on 38) The invention of claim 38, wherein a plurality of said mounting members connect said cartridge platform to said body portion, said mounting members comprising double cantilever springs supporting a plurality of blade seats forming said cartridge platform. ### Claim 40 (depends on 38) The invention of claim 38, wherein said four-bar linkage causes the cartridge platform in said blade assembly to move away either by rotational or translational movement from the shaving forces acting upon said cartridge platform. ### Claim 41 (depends on 38) The invention of claim 38, wherein at least one of said mounting members includes first and second elements defining a second axis of rotation for said mounting member in manner that said body portion, said cartridge platform and said first and second mounting members comprising a five-bar linkage. ### Claim 42 (depends on 38) The invention of claim 38, wherein said blade assembly comprising said cartridge platform includes a first and second blade separated by a spacer.