CA2144507C - Chair base having double-tapered locking hub - Google Patents

Chair base having double-tapered locking hub

Info

Publication number
CA2144507C
CA2144507C CA002144507A CA2144507A CA2144507C CA 2144507 C CA2144507 C CA 2144507C CA 002144507 A CA002144507 A CA 002144507A CA 2144507 A CA2144507 A CA 2144507A CA 2144507 C CA2144507 C CA 2144507C
Authority
CA
Canada
Prior art keywords
tapered portion
hub
improvement
taper angle
column
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CA002144507A
Other languages
French (fr)
Other versions
CA2144507A1 (en
Inventor
John Alexander Hertel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOCK NORTH AMERICA Ltd
Original Assignee
Plastic Prescriptions Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Plastic Prescriptions Ltd filed Critical Plastic Prescriptions Ltd
Publication of CA2144507A1 publication Critical patent/CA2144507A1/en
Application granted granted Critical
Publication of CA2144507C publication Critical patent/CA2144507C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/002—Chair or stool bases
    • A47C7/004—Chair or stool bases for chairs or stools with central column, e.g. office chairs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/20—Chairs or stools with vertically-adjustable seats
    • A47C3/30—Chairs or stools with vertically-adjustable seats with vertically-acting fluid cylinder

Abstract

The chair of the present invention has a dual-tapered locking hub. A first tapered portion is provided for a major portion of the internal core, and a second tapered potion is provided in the remainder of the internal core. The taper angle of the second is greater than the taper angle of the first portion. The first tapered portion prevents wobbling of the central column within the chair base after extensive use, whereas the second tapered portion prevents creeping of the central column through the chair base and locks in the central column.

Claims (10)

1. In a base for a swivel-type chair in which the base includes a centralhub for receiving and retaining therein a central column connecting the base with the seat of the chair, the improvement comprising:
the hub having a first tapered portion extending for a major portion of the length of the hub, and a second tapered portion extending for the remaining length of the hub, the first and second tapered portions each having upper diameters greater than their respective lower diameters, wherein the lower diameter of the upper tapered portion is equal to the upper diameter of the lower tapered portion, wherein the taper angle of the second tapered portion is greater than the taper angle of the first tapered portion so that one end of the column is received and retained within the hub, the greater taper angle of the second tapered portion thereby prevents creeping of the column through the chair base and locks the column in the hub, and the first tapered portion prevents wobbling of the column within the chair base.
2. The improvement of claim 1, in which the one end of the column has a diameter such that the one end engages the second tapered portion when the one end of the column is received in the hub.
3. The improvement of claim 1, in which the taper angle of the second tapered portion is in the range of 5° and 75°, and the taper angle of the first tapered portion is in the range of 2° and 15°.
4. The improvement of claim 3, in which the taper angle of the second tapered portion is in the range of 7° and 50°, and the taper angle of the first tapered portion is in the range of 2° and 5°.
5. The improvement of claim 4, in which the taper angle of the second tapered portion is 9°, and the taper angle of the first tapered portion is 2°.
6. The improvement of claim 1, in which the the first tapered portion extends for between 50% and 75% of the length of the hub.
7. The improvement of claim 5, in which the second tapered portion extends for 25% of the length of the hub, and the first tapered portion extends for 75% of the length of the hub.
8. The improvement of any one of claims 1, 2, 3, 4 or 5, in which the second tapered portion locks the central column into place and prevents the column from creeping down through the hub.
9. The improvement of claim 1, in which the central column is a gas cylinder.
10. The improvement of claim 9 in which the gas cylinder is made of plastic.
CA002144507A 1994-03-14 1995-03-13 Chair base having double-tapered locking hub Expired - Lifetime CA2144507C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9404917A GB9404917D0 (en) 1994-03-14 1994-03-14 Chair base having double-tapered locking internal core
GB9494917.8 1994-03-14

Publications (2)

Publication Number Publication Date
CA2144507A1 CA2144507A1 (en) 1995-09-15
CA2144507C true CA2144507C (en) 1996-06-25

Family

ID=10751791

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002144507A Expired - Lifetime CA2144507C (en) 1994-03-14 1995-03-13 Chair base having double-tapered locking hub

Country Status (3)

Country Link
US (1) US5692715A (en)
CA (1) CA2144507C (en)
GB (1) GB9404917D0 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6116555A (en) * 1998-05-29 2000-09-12 Krueger International, Inc. Plastic chair base including hub with integral ring and oppositely-directed tapers
US6290191B1 (en) * 1999-08-19 2001-09-18 Steelcase Development Corporation Chair base
US7841665B2 (en) * 2007-06-01 2010-11-30 Steelcase Inc. Height adjustable armrest
US8733838B2 (en) * 2010-06-07 2014-05-27 Scott Suprina Floor track for seating system
CN103054373A (en) * 2011-10-24 2013-04-24 合肥杰事杰新材料股份有限公司 Plastic chair leg
CA2916235C (en) * 2013-06-21 2021-12-07 Medway Plastics Corporation Stacking ring for chair bases

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US168383A (en) * 1875-10-05 Improvement in bases for revolving chairs
US714764A (en) * 1901-07-30 1902-12-02 Heywood Bros And Wakefield Company Swiveled chair.
US2111642A (en) * 1937-02-08 1938-03-22 Francis D Saier Candle holding device
US2218583A (en) * 1937-12-13 1940-10-22 John J Marthaler Chair base
US2490210A (en) * 1945-02-24 1949-12-06 Roy A Cramer Chair base
US2617617A (en) * 1950-03-21 1952-11-11 Oscar J Krastel Christmas tree clamp and supporting standard
US2802635A (en) * 1954-12-06 1957-08-13 Northrop Aircraft Inc Flex jack
GB821587A (en) * 1957-06-27 1959-10-07 William Ivor Massil Improvements in or relating to ferrules for the legs of articles of furniture
US3348797A (en) * 1962-12-17 1967-10-24 Turbyfill Charles William Golf flag pin base
US3223368A (en) * 1964-11-23 1965-12-14 Charles R Pollock Furniture pedestal
US3323833A (en) * 1965-07-06 1967-06-06 Kasparian S Inc Readily expandable pedestal construction for one or more seating units
FR1471286A (en) * 1966-12-01 1967-03-03 Advanced tree stand or the like
DE2263657A1 (en) * 1972-12-27 1974-07-04 Wilde & Spieth LEGS FOR OFFICE CHAIRS
IT984809B (en) * 1973-03-05 1974-11-20 Ambasz E MODULAR BASE FOR FURNITURE
US4712758A (en) * 1986-01-27 1987-12-15 Casper Cuschera Nested hub knock-down pedestal
US4821986A (en) * 1988-02-03 1989-04-18 Steelcase Inc. Multiple leg furniture base
US5149035A (en) * 1988-09-01 1992-09-22 The Shaw-Walker Company Chair base and post assembly for an office chair
US4911391A (en) * 1989-07-17 1990-03-27 Henschel-Steinau, Inc. Pedestal base
US5044299A (en) * 1990-05-07 1991-09-03 Frank Ronald M Seat construction for a boat
US5377943A (en) * 1993-12-21 1995-01-03 Shepherd Products, Inc. Chair base
US5454536A (en) * 1994-01-13 1995-10-03 Westinghouse Electric Corporation Chair base assembly

Also Published As

Publication number Publication date
CA2144507A1 (en) 1995-09-15
GB9404917D0 (en) 1994-04-27
US5692715A (en) 1997-12-02

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Legal Events

Date Code Title Description
EEER Examination request
MKEX Expiry

Effective date: 20150313