US2432245A - Locking device for the seat posts of chairs - Google Patents

Locking device for the seat posts of chairs Download PDF

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Publication number
US2432245A
US2432245A US594196A US59419645A US2432245A US 2432245 A US2432245 A US 2432245A US 594196 A US594196 A US 594196A US 59419645 A US59419645 A US 59419645A US 2432245 A US2432245 A US 2432245A
Authority
US
United States
Prior art keywords
ring
spindle
handle
locking device
chairs
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
US594196A
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English (en)
Inventor
Lundquist Carl Ernst Edvard
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US2432245A publication Critical patent/US2432245A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • A47C3/28—Chairs or stools with vertically-adjustable seats with clamps acting on vertical rods

Definitions

  • the invention relates to a device for locking a shaft adapted to be displaced in its longitudinal direction relatively to an element. More particularly, the invention relates to a locking device for the seat post of a chair having a seat to be raised and lowered.
  • Devices of this kind consist of a ring provided with a handle and thrust over the seat post, said ring being rotatably mounted in the frame of the chair and being adapted under the influence of a force, such as from a spring, to take an oblique position about the seat post in order to secure the latter to the frame of the chair by a clamping efiect. If the chair seat is loaded, it may occur that the chair post rotates relatively to the clamping ring in spite of the clamping effect thereof, and that an axial displacement of the chair post thereby takes place. In order to prevent such unintentional rotation it is known to form the cylindrical chair post with a flat surface, while the clamping ring is given a corresponding internal shape. It is the object of the invention to improve such a device, so that the locking effect becomes satisfactory, without it being necessary to give the shaft or the chair post a shape other than cylindrical.
  • Fig. 1 shows a portion of a chair having a looking device according to the invention, the figure being partly represented in vertical section.
  • Fig. 2 shows a section on the line II-II of Fig. 1.
  • Fig, 3 shows a somewhat modified construction according to the invention in a section corresponding to that of Fig. 2.
  • Ill designates a post or spindle in the form of a tube, the upper end of the spindle carrying a chair seat (not shown).
  • the spindle i0 is axially displaceable within a sleeve l2 which, together with legs Hi, forms the chair frame resting on a carrying surface.
  • a projection l6 Secured to the frame, preferably the sleeve l2 thereof, as at the lower portion thereof, is a projection l6 having the locking device according to the invention mounted thereon, said locking device consisting of a ring [8 arranged about the spindle I3 and of a handle connected to the ring.
  • the projection 16 which is preferably of an elongated cross section in the horizontal plane, is for this purpose provided with a recess 22 on the one side and with a shoulder 24 on the other side thereof, which enters an elongated aperture 26 in the handle 20.
  • the elongated aperture 26 is of a length greater than the distance between the bottom of the recess 22 and the shoulder 24, in order to ensure a certain freedom of movement between the ring and the handle on the one hand and the projection on the other hand, in a direction toward and from the spindle, while the ring l B and the handle 29 are pivotable in the vertical direction (in a plane through the longitudinal axis of the spindle).
  • the projection 16 is of greater width below the recess 22 and the shoulder 24, and forms an abutment 28 for the retention of a plate spring 30 hearing with an initial tension on the handle 20 adjacent to the free end thereof.
  • the spring 30 causes the ring 18 to take an oblique position relative to the spindle IB, that is to say, at a relatively small angle to the horizontal plane.
  • the handle 20 as well as the spring 30 loosely engage the projection l6, that is to say, they have no special securing members.
  • the ring I8 is formed in such manner as to bear on the spindle I0 in three places at least.
  • the ring I8 is formed on the inside thereof with two surfaces 34 forming an angle between them, said surfaces then 1ying each on one side of a line extending through the centre of the spindle and the centre of the projection l6.
  • the surfaces 34 are disposed on that side of the spindle In which is opposed to the handle 20.
  • the surfaces 34 have a wedge action ensuring the above-mentioned effect, that is so that the axial position of the spindle is fixed while a turning movement between the spindle IO and the frame is safely prevented at the same time, even when the spindle carries load. It has been proved in practice that the locking effect becomes particularly pronounced Where the spindle is tubular, and particularly good results are obtained with tubular spindles made from resilient material, such as steel.
  • the ring [8 is caused to move upwardly into a position where it is at least approximately in a plane at right angles to the axis of the spindle, as indicated by the dash and dot lines in the figures.
  • the locking engagement between the ring 18 and the spindle Ill is thus discontinued, and the spindle may be displaced in its ongitudinal direction.
  • the projection It prevents the handle from swinging down lower than this substantially horizontal position.
  • the handle 20 and the ring l8 are brought into contact with the shoulder 24 in the position in question. Consequently, the handle 20 cannot be swung down so far that the ring l8 adjusts itself into the corresponding upper clamping position.
  • the embodiment according to Fig. 3 While in the embodiment according to Fig. 2 the ring [8 is of a curved or circular shape at the contact surface against the spindle on the side opposed to the surfaces 34, the embodiment according to Fig. 3 also has a two-point bearing on this side.
  • the ring I8 is thus formed with surfaces 36 symmetrical with respect to the abovementioned line through the centre of the projection l6 and the axis of the spindle.
  • the locking device according to Fig. 3 may be constructed in the same manner as in the preceding embodiment, the same reference characters being used for corresponding parts.
  • a supporting structure having a cylindrical sleeve, a cylindrical rod axially displaceable in said sleeve, a member secured to said structure and extending to one side of said rod, a ring encircling said rod, a handle secured to said ring and extending therefrom, said handle being formed with an opening therethrough, said member extending loosely through said opening and having a shoulder for pivotally supporting said handle, a spring stressed between said member and said handle for pivoting the latter to tilt-said ring with respect to a plane normal to the axis of said rod, and the interior configuration of said ring being non-circular so as to provide at least three separate points of contact with said cylindrical rod when the ring is tilted.
  • a device as claimed in claim 1 in which said member is provided with an abutment limiting pivoting of said ring to a plane substantially normal to the axis of said rod.

Landscapes

  • Mutual Connection Of Rods And Tubes (AREA)
  • Clamps And Clips (AREA)
US594196A 1944-06-05 1945-05-17 Locking device for the seat posts of chairs Expired - Lifetime US2432245A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE463644A SE126404C1 (cg-RX-API-DMAC10.html) 1944-06-05 1944-06-05

Publications (1)

Publication Number Publication Date
US2432245A true US2432245A (en) 1947-12-09

Family

ID=20425647

Family Applications (1)

Application Number Title Priority Date Filing Date
US594196A Expired - Lifetime US2432245A (en) 1944-06-05 1945-05-17 Locking device for the seat posts of chairs

Country Status (4)

Country Link
US (1) US2432245A (cg-RX-API-DMAC10.html)
FR (1) FR953741A (cg-RX-API-DMAC10.html)
GB (1) GB599447A (cg-RX-API-DMAC10.html)
SE (1) SE126404C1 (cg-RX-API-DMAC10.html)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2588174A (en) * 1950-05-16 1952-03-04 Brooklyn Hospital Equipment Co Foot-operated clutch mechanism for physician's examination tables
US2595354A (en) * 1952-05-06 Adjustable chaik and seat
US2673067A (en) * 1951-05-07 1954-03-23 Minot Builders Supply Co Inc Jack for raising forms and flooring in erection of concrete buildings
US2673590A (en) * 1950-07-24 1954-03-30 Bertis F Hamilton Vertically adjustable pedestal chair
US3021921A (en) * 1959-05-22 1962-02-20 Clement C Poelvoorde Ladder extension
US3092154A (en) * 1960-03-28 1963-06-04 Portable Electric Tools Inc Radial saw adjustment means
GB2365761A (en) * 2000-08-12 2002-02-27 Chub Leisure Ltd Adjustable telescopic strut

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4398766A (en) * 1981-04-27 1983-08-16 Tusco, Inc. Boat seat mounting structure
DK154523C (da) * 1984-02-23 1989-05-16 Wassmann Mogens Laasering og anvendelse af laaseringen
US4634320A (en) * 1985-07-01 1987-01-06 Milwaukee Electric Tool Corporation Drill stand lock

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US836303A (en) * 1906-04-26 1906-11-20 Carl V J Christensen Automatic-locking collar.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US836303A (en) * 1906-04-26 1906-11-20 Carl V J Christensen Automatic-locking collar.

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2595354A (en) * 1952-05-06 Adjustable chaik and seat
US2588174A (en) * 1950-05-16 1952-03-04 Brooklyn Hospital Equipment Co Foot-operated clutch mechanism for physician's examination tables
US2673590A (en) * 1950-07-24 1954-03-30 Bertis F Hamilton Vertically adjustable pedestal chair
US2673067A (en) * 1951-05-07 1954-03-23 Minot Builders Supply Co Inc Jack for raising forms and flooring in erection of concrete buildings
US3021921A (en) * 1959-05-22 1962-02-20 Clement C Poelvoorde Ladder extension
US3092154A (en) * 1960-03-28 1963-06-04 Portable Electric Tools Inc Radial saw adjustment means
GB2365761A (en) * 2000-08-12 2002-02-27 Chub Leisure Ltd Adjustable telescopic strut

Also Published As

Publication number Publication date
GB599447A (en) 1948-03-12
SE126404C1 (cg-RX-API-DMAC10.html) 1949-10-18
FR953741A (fr) 1949-12-12

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