Pivotable and height-adjustable chair back rest assembly and blow-molded back rest therefor
First Claim
1. A height adjusting support mechanism for a back rest of a chair, said mechanism comprising:
- a support plate having a plurality of vertical slots,a carrier slidably attached to said support plate by engagement through said vertical slots for vertical movement relative to said plate and operatively attached to a back rest so that said back rest moves with said carrier in the vertical direction, andselectively interengageable latch components joined to said support plate and said carrier for retaining said carrier in various vertical positions relative to said support plate, wherein said carrier pivotally supports said back rest for movement between a substantially vertical position and an inclined position.
2 Assignments
0 Petitions
Accused Products
Abstract
A chair is provided having a blow molded back rest and a mechanism which permits the back rest to pivot rearwardly and to be vertically adjusted. The mechanism has a carrier block slidably engaging vertical slots in a support member for vertical adjustment movement. The back rest is operatively attached to the carrier block so that the back rest can move in the vertical direction in unison with the carrier block or pivot rearwardly. The carrier block has a curved integral spring which engages the rear of the back rest to bias the back rest forward and to regulate the rearward pivoting motion as the user reclines. A handle and latch member are pivotably connected to the carrier block for movement between an engaged position in which a detent finger of the latch member acts as the stop latch or retainer which selectively engages a series of vertically spaced holes in the support member to secure the attached back rest and carrier block in the desired vertical position and a disengaged position in which the latch member and the handle are pivoted toward the front of the chair so that the detent finger is disengaged from the holes, thereby permitting the attached back rest and carrier block to be vertically adjusted.
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Citations
24 Claims
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1. A height adjusting support mechanism for a back rest of a chair, said mechanism comprising:
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a support plate having a plurality of vertical slots, a carrier slidably attached to said support plate by engagement through said vertical slots for vertical movement relative to said plate and operatively attached to a back rest so that said back rest moves with said carrier in the vertical direction, and selectively interengageable latch components joined to said support plate and said carrier for retaining said carrier in various vertical positions relative to said support plate, wherein said carrier pivotally supports said back rest for movement between a substantially vertical position and an inclined position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A height adjusting support mechanism for a tiltable back rest of a chair, said mechanism comprising:
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a support member, a carrier member attached to said support member for vertical movement relative thereto, said carrier member pivotally supporting a back rest for tilting movement about a generally horizontal axis and such that said back rest moves with said carrier in the vertical direction, said carrier member including a resilient cantilever component which is integral with said carrier member and protrudes upwardly thereof and abuts said back rest above said horizontal axis and resiliently biases said back rest to an upright position while permitting rearward tilting thereof about said horizontal axis, and selectively interengageable latch components joined to said support member and said carrier member for retaining said carrier member in various vertical positions relative to said support member. - View Dependent Claims (14, 15, 16, 17)
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18. A chair comprising a height adjusting mechanism, a blow-molded back rest and a substantially vertical support member,
said back rest comprising an integral blow molded frame formed by front and rear walls joined to one another at their peripheries and defining a central cavity area therewithin, a plurality of alternating ribs and recesses disposed along said rear wall for structurally reinforcing said back rest, wherein said ribs are hollow and said front wall has a contoured front surface for supporting a back of a user, said mechanism comprising a carrier member slidably attached to said support member and operatively attached to said back rest so that said back rest moves in unison with said carrier member in the vertical direction, and selectively interengageable latch components joined to said support member and said carrier member for retaining said carrier member in various vertical positions relative to said support member, said back rest being pivotally attached to said carrier member for movement between a substantially vertical position and an inclined position.
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24. A chair comprising a height adjusting mechanism, a blow-molded back rest and a substantially vertical support member,
said back rest comprising an integral blow molded frame formed by front and rear walls joined to one another at their peripheries and defining a central cavity area therewithin, a plurality of alternating ribs and recesses disposed along said rear wall for structurally reinforcing said back rest, wherein said ribs are hollow and said front wall has a contoured front surface for supporting a back of a user, said mechanism comprising a carrier member slidably attached to said support member and operatively attached to said back rest so that said back rest moves in unison with said carrier member in the vertical direction, and selectively interengageable latch components joined to said support member and said carrier member for retaining said carrier member in various vertical positions relative to said support member, said latch components comprising a latch member pivotally attached to one of said carrier member and said support member for pivotal movement about a first axis between an engaged position in which said latch member engages the other of said carrier member and said support member to hold said back rest in the desired vertical position and a disengaged position in which said latch member is disengaged from the other of said carrier member and said support member to permit said back rest to be vertically adjusted, wherein said back rest is pivotally attached to said carrier member for movement between a substantially vertical position and an inclined position, and a spring member integrally formed with said carrier member and engaging said back rest for biasing said back rest to the vertical position.
Specification