# US 9,750,351 B2 · Seat assembly for an infant chair and infant high chair including the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,750,351 B2 - Document ID: US9750351B2 - Status: Granted - Kind: B2 - Application number: 14/797,244 - Filed: 2015-07-13 - Published: 2016-01-14 - Granted: 2017-09-05 - Earliest claimed: 2014-07-11 - Assignees: Wonderland Nurserygoods Company Limited - Applicants: Wonderland Nurserygoods Company Limited - Inventors: Daniel A. Sack; Andrew J. Horst - Web page: https://patentgrep.com/patent/US9750351B2 ## CPC - A47D 1/0081: {adjustable} - A47D 1/023: {of high chair type} - A47D 1/04: convertible from a high chair to a low one {, e.g.} by reversing - A47D: FURNITURE SPECIALLY ADAPTED FOR CHILDREN (school benches or desks A47B39/00, A47B41/00) ## Abstract A seat assembly for infant chair includes a seat support frame, a rear and a front seat portion respectively connected with the seat support frame, and a weight-sensitive lock mechanism placed adjacent to the rear and front seat portions. The front seat portion is slidable relative to the rear seat portion along a lengthwise axis between an expanded state and a contracted state, the lengthwise axis extending from a front to a rear of the seat assembly, and the front and rear seat portion when in the expanded state defining a sitting surface adapted to receive a child. The weight-sensitive lock mechanism is activated by the placement of a load on the seat assembly to prevent displacement of the front seat portion relative to the rear seat portion from the expanded state to the contracted state. In one embodiment, the seat assembly including the weight-sensitive lock mechanism is implemented in an infant high chair. ## Claims ### Claim 1 An infant high chair comprising: a collapsible standing frame; a seat support frame connected with the standing frame; a rear and a front seat portion respectively connected with the seat support frame, the front seat portion being movable relative to the rear seat portion between an expanded state and a contracted state, the front and rear seat portion when in the expanded state defining a sitting surface adapted to receive a child; and a weight-sensitive lock mechanism placed adjacent to the rear and front seat portions, the weight-sensitive lock mechanism being activated by the placement of a load on the sitting surface to prevent displacement of the front seat portion relative to the rear seat portion from the expanded state to the contracted state, wherein the weight-sensitive lock mechanism includes a first contact surface affixed with the rear seat portion, and a second contact surface affixed with the front seat portion, the first and second contact surfaces being engagable with each other to block displacement of the front seat portion relative to the rear seat portion from the expanded state to the contracted state, and the rear seat portion and the front seat portion being movable relative to each other to reduce a distance between the first and second contact surfaces in response to the placement of a load on the sitting surface in the expanded state. ### Claim 2 (depends on 1) The infant high chair according to claim 1, wherein the weight-sensitive lock mechanism further includes: a resilient member applying a force for causing relative movement between the rear seat portion and the front seat portion in a first direction that increases a distance between the first and second contact surfaces; wherein the placement of a load on the sitting surface causes relative movement between the rear seat portion and the front seat portion in a second direction that reduces a distance between the first and second contact surfaces. ### Claim 3 (depends on 2) The infant high chair according to claim 2, wherein the rear seat portion is connected with a shaft portion that has two ends assembled with the seat support frame. ### Claim 4 (depends on 3) The infant high chair according to claim 3, wherein the resilient member is configured to apply a force that biases the rear seat portion in rotation about the shaft portion. ### Claim 5 (depends on 4) The infant high chair according to claim 4, wherein the resilient member is a torsion spring that is assembled around the shaft portion and is connected with the rear seat portion. ### Claim 6 (depends on 4) The infant high chair according to claim 4, wherein the first contact surface is defined on a stop rib that protrudes downward at an underside of the rear seat portion. ### Claim 7 (depends on 2) The infant high chair according to claim 2, wherein the resilient member is affixed with the front seat portion near a rear thereof, the resilient member being extendible above an upper surface of the front seat portion. ### Claim 8 (depends on 2) The infant high chair according to claim 2, wherein the second contact surface is defined on a stop rib that protrudes upward from an upper surface of the front seat portion. ### Claim 9 (depends on 1) The infant high chair according to claim 1, wherein the front seat portion is slidable relative to the rear seat portion along a lengthwise axis extending from a rear to a front of the infant high chair. ### Claim 10 (depends on 9) The infant high chair according to claim 9, wherein the front seat portion is slidable rearward toward an underside of the rear seat portion. ### Claim 11 (depends on 1) The infant high chair according to claim 1, further including: a side segment pivotally connected with the seat support frame about a pivot axis, the front seat portion being respectively connected with the seat support frame and the side segment at two vertically spaced-apart locations; wherein a rotation of the side segment in a folding direction drives a rearward sliding displacement of the front seat portion relative to the rear seat portion. ### Claim 12 (depends on 11) The infant high chair according to claim 11, wherein the front seat portion has an upper surface, and a first and a second extension respectively projecting upward and downward relative to the upper surface, the first extension being connected with the side segment, and the second extension being connected with the seat support frame. ### Claim 13 (depends on 11) The infant high chair according to claim 11, wherein the two locations where the front seat portion respectively connects with the seat support frame and the side segment are arranged forward relative to the pivot axis. ### Claim 14 A seat assembly for an infant chair, comprising: a seat support frame; a rear and a front seat portion respectively connected with the seat support frame, the front seat portion being slidable relative to the rear seat portion along a lengthwise axis between an expanded state and a contracted state, the lengthwise axis extending from a front to a rear of the seat assembly, and the front and rear seat portion when in the expanded state defining a sitting surface adapted to receive a child; and a weight-sensitive lock mechanism placed adjacent to the rear and front seat portions, the weight-sensitive lock mechanism being activated by the placement of a load on the seat assembly to prevent displacement of the front seat portion relative to the rear seat portion from the expanded state to the contracted state. ### Claim 15 (depends on 14) The seat assembly according to claim 14, wherein the weight-sensitive lock mechanism includes: a first contact surface affixed with the rear seat portion, and a second contact surface affixed with the front seat portion, the first and second contact surfaces engaging with each other to block displacement of the front seat portion relative to the rear seat portion from the expanded state to the contracted state; and a resilient member applying a force for causing relative movement between the rear seat portion and the front seat portion in a first direction that increases a distance between the first and second contact surfaces; wherein the placement of a load on the sitting surface causes relative movement between the rear seat portion and the front seat portion in a second direction that reduces a distance between the first and second contact surfaces. ### Claim 16 (depends on 15) The seat assembly according to claim 15, wherein the rear seat portion is connected with a shaft portion that has two ends assembled with the seat support frame. ### Claim 17 (depends on 16) The seat assembly according to claim 16, wherein the resilient member is configured to apply a force that biases the rear seat portion in rotation about the shaft portion. ### Claim 18 (depends on 16) The seat assembly according to claim 16, wherein the resilient member is a torsion spring that is assembled around the shaft portion and is connected with the rear seat portion. ### Claim 19 (depends on 15) The seat assembly according to claim 15, wherein the resilient member is affixed with the front seat portion near a rear thereof. ### Claim 20 (depends on 15) The seat assembly according to claim 15, wherein the second contact surface is defined on a stop rib that protrudes upward from an upper surface of the front seat portion. ### Claim 21 (depends on 15) The seat assembly according to claim 15, wherein the first contact surface is defined on a stop rib that protrudes downward at an underside of the rear seat portion. ### Claim 22 (depends on 14) The seat assembly according to claim 14, wherein the front seat portion is slidable rearward toward an underside of the rear seat portion. ### Claim 23 (depends on 14) The seat assembly according to claim 14, wherein the seat assembly further includes: a side segment pivotally connected with the seat support frame about a pivot axis, the front seat portion being respectively connected with the seat support frame and the side segment at two vertically spaced-apart locations; wherein a rotation of the side segment in a folding direction drives a rearward sliding displacement of the front seat portion relative to the rear seat portion. ### Claim 24 (depends on 23) The seat assembly according to claim 23, wherein the front seat portion has an upper surface, and a first and a second extension respectively projecting upward and downward relative to the upper surface, the first extension being connected with the side segment, and the second extension being connected with the seat support frame.