Patent US3710418A successfully refreshed from Google Patents.
US3710418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chair having a back rest and means for adjusting the inclination thereof
Assignee: Wiesner Hager KG
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Filing: 1971-10-14
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Granted: 1973-01-16
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Expires: 1991-10-14
Abstract
Abstract A pocket member is fixed or adapted to be fixed to the seat plate of a chair. A horizontal shaft is rotatably mounted in said pocket member. A bearing member and a pinion are corotationally mounted on said shaft. A holder is pivoted to said pocket member on a horizontal axis and connected or adapted to be connected to the back rest of said chair. A gear segment is carried by said holder and in mesh with said pinion. A nonrotatable ratchet ring is coaxial with said shaft and secured to said pocket member and carries internal teeth. Two symmetrically opposite locking pawls are pivoted to said bearing member on axes which are parallel to said shaft. Each of said locking pawls has a toothed outer side which faces said internal teeth and is engageable therewith in such a manner that one of said locking pawls is engageable with said internal teeth to hold said bearing member and shaft against rotation in one, and only one, direction, and the other of said locking pawls is engageable with said internal teeth to hold said bearing member and shaft against rotation in the opposite, and only in the opposite, direction. Spring means urge said locking pawls into engagement with said internal teeth. Two cam followers are provided, each of which is generally parallel to said shaft and carried by one of said locking pawls. A hand wheel is freely rotatably mounted on said shaft and provided with first cam faces which are adapted to engage said cam follower of that of said locking pawls which normally holds said bearing member against rotation in the direction in which the hand wheel is being rotated, and with two spaced apart second cam faces. An additional cam follower is carried by said bearing member and extends with a backlash between said second cam faces.
Inventors
- 👤 W Kratzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:34
CPC Classifications
A; A47; A47C; A47C1/00; A47C1/02; A47C1/022; A47C1/024; A47C1/026
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
317 words
A device for adjusting the inclination of a back rest of a chair having a seat plate, which device comprises a pocket member adapted to be fixed to said seat plate, a horizontal shaft rotatably mounted in said pocket member, a bearing member corotationally mounted on said shaft, a pinion corotationally mounted on said shaft, a holder pivoted to said pocket member on a horizontal axis and adapted to be connected to said back rest, a gear segment carried by said holder and in mesh with said pinion, a nonrotatable ratchet ring which is coaxial with said shaft and secured to said pocket member and carries internal teeth, two symmetrically opposite locking pawls pivoted to said bearing member on axes which are parallel to said shaft, each of said locking pawls having a toothed outer side which faces said internal teeth and is engageable therewith in such a manner that one of said locking pawls is engageable with said internal teeth to hold said bearing member and shaft against rotation in one, and only one, direction, and the other of said locking pawls is engageable with said internal teeth to hold said bearing member and shaft against rotation in the opposite, and only in the opposite, direction, spring means urging said locking pawls into engagement with said internal teeth, two cam followers, each of which is generally parallel to said shaft and carried by one of said locking pawls, a hand wheel, which is freely rotatably mounted on said shaft and provided with first cam faces which are adapted to engage said cam follower of that of said locking pawls which normally holds said bearing member against rotation in the direction in which the hand wheel is being rotated, and with two spaced apart second cam faces, and an additional cam follower carried by said bearing member and extending with a backlash between said second cam faces.
Claim 2
Independent Claim
317 words
A device for adjusting the inclination of a back rest of a chair having a seat plate, which device comprises a pocket member adapted to be fixed to said seat plate, a horizontal shaft rotatably mounted in said pocket member, a bearing member corotationally mounted on said shaft, a pinion corotationally mounted on said shaft, a holder pivoted to said pocket member on a horizontal axis and adapted to be connected to said back rest, a gear segment carried by said holder and in mesh with said pinion, a nonrotatable ratchet ring which is coaxial with said shaft and secured to said pocket member and carries internal teeth, two symmetrically opposite locking pawls pivoted to said bearing member on axes which are parallel to said shaft, each of said locking pawls having a toothed outer side which faces said internal teeth and is engageable therewith in such a manner that one of said locking pawls is engageable with said internal teeth to hold said bearing member and shaft against rotation in one, and only one, direction, and the other of said locking pawls is engageable with said internal teeth to hold said bearing member and shaft against rotation in the opposite, and only in the opposite, direction, spring means urging said locking pawls into engagement with said internal teeth, two cam followers, each of which is generally parallel to said shaft and carried by one of said locking pawls, a hand wheel, which is freely rotatably mounted on said shaft and provided with first cam faces which are adapted to engage said cam follower of that of said locking pawls which normally holds said bearing member against rotation in the direction in which the hand wheel is being rotated, and with two spaced apart second cam faces, and an additional cam follower carried by said bearing member and extending with a backlash between said second cam faces.
Claim 3
Dependent Claim
21 words
A device as set forth in claim 1, in which said cam followers carried by said locking pawls consist of pins.
Claim 4
Dependent Claim
18 words
A device as set forth in claim 1, in which said additional cam follower consists of a pin.
Claim 5
Dependent Claim
33 words
A device as set forth in claim 1, in which said shaft is polygonal and said pinion and said bearing member have polygonal apertures which are complementary to and receive said polygonal shaft.
Claim 6
Dependent Claim
52 words
A device as set forth in claim 1, in which said ratchet ring is carried by a ring carrier having an extension formed with a through bore, said pocket member is formed with an aperture which mates and receives said extension, and said bearing member is rotatably mounted in said through bore.
Claim 7
Dependent Claim
17 words
A device as set forth in claim 1, in which said ring carrier consists of a disc.
Claim 8
Dependent Claim
21 words
A device as set forth in claim 5, in which said extension and said aperture in said pocket member are square.
Claim 9
Dependent Claim
27 words
A device as set forth in claim 7, in which said square aperture in said pocket member is larger than an imaginary squaRe circumscribed to said pinion.
Claim 10
Dependent Claim
23 words
Apparatus as set forth in claim 1, in which said pinion has a bearing extension, which is rotatably mounted in said pocket member.
Claim 11
Dependent Claim
34 words
A device as set forth in claim 1, in which said bearing member has two circular apertures and said locking pawls have end portions which are complementary to and received in said circular apertures.
Claim 12
Dependent Claim
30 words
A device as set forth in claim 1, in which said hand wheel is formed with a cross-shaped aperture which is partly defined by said first and second cam faces.
Claim 13
Dependent Claim
26 words
A device as set forth in claim 1, in which said spring means consist of a single spring urging said locking pawls toward said internal teeth.
Claim 14
Dependent Claim
328 words
In a chair having a seat plate, a back rest, and a back rest carrier rigid with said back rest, the provision of a device for adjusting the inclination of said back rest, which device comprises: a pocket member fixed to said seat plate, a horizontal shaft rotatably mounted in said pocket member, a bearing member corotationally mounted on said shaft, a pinion corotationally mounted on said shaft, a holder pivoted to said pocket member on a horizontal axis and connected to said back rest carrier, a gear segment carried by said holder and in mesh with said pinion, a nonrotatable ratchet ring which is coaxial with said shaft and secured to said pocket member and carries internal teeth, two symmetrically opposite locking pawls pivoted to said bearing member on axes which are parallel to said shaft, each of said locking pawls having a toothed outer side which faces said internal teeth and is engageable therewith in such a manner that one of said locking pawls is engageable with said internal teeth to hold said bearing member and shaft against rotation in one, and only one, direction, and the other of said locking pawls is engageable with said internal teeth to hold said bearing member and shaft against rotation in the opposite, and only in the opposite, direction, spring means urging said locking pawls into engagement with said internal teeth, two cam followers, each of which is generally parallel to said shaft and carried by one of said locking pawls, a hand wheel, which is freely rotatably mounted on said shaft and provided with first cam faces which are adapted to engage said cam follower of that of said locking pawls which normally holds said bearing member against rotation in the direction in which the hand wheel is being rotated, and with two spaced apart second cam faces, and an additional cam follower carried by said bearing member and extending with a backlash between said second cam faces.
Claim 15
Dependent Claim
328 words
In a chair having a seat plate, a back rest, and a back rest carrier rigid with said back rest, the provision of a device for adjusting the inclination of said back rest, which device comprises: a pocket member fixed to said seat plate, a horizontal shaft rotatably mounted in said pocket member, a bearing member corotationally mounted on said shaft, a pinion corotationally mounted on said shaft, a holder pivoted to said pocket member on a horizontal axis and connected to said back rest carrier, a gear segment carried by said holder and in mesh with said pinion, a nonrotatable ratchet ring which is coaxial with said shaft and secured to said pocket member and carries internal teeth, two symmetrically opposite locking pawls pivoted to said bearing member on axes which are parallel to said shaft, each of said locking pawls having a toothed outer side which faces said internal teeth and is engageable therewith in such a manner that one of said locking pawls is engageable with said internal teeth to hold said bearing member and shaft against rotation in one, and only one, direction, and the other of said locking pawls is engageable with said internal teeth to hold said bearing member and shaft against rotation in the opposite, and only in the opposite, direction, spring means urging said locking pawls into engagement with said internal teeth, two cam followers, each of which is generally parallel to said shaft and carried by one of said locking pawls, a hand wheel, which is freely rotatably mounted on said shaft and provided with first cam faces which are adapted to engage said cam follower of that of said locking pawls which normally holds said bearing member against rotation in the direction in which the hand wheel is being rotated, and with two spaced apart second cam faces, and an additional cam follower carried by said bearing member and extending with a backlash between said second cam faces.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |