US3186064A - Method of making a chair base - Google Patents
Method of making a chair base Download PDFInfo
- Publication number
- US3186064A US3186064A US366363A US36636364A US3186064A US 3186064 A US3186064 A US 3186064A US 366363 A US366363 A US 366363A US 36636364 A US36636364 A US 36636364A US 3186064 A US3186064 A US 3186064A
- Authority
- US
- United States
- Prior art keywords
- shell
- leg
- inner shell
- chair base
- making
- 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
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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
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49616—Structural member making
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49879—Spaced wall tube or receptacle
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49885—Assembling or joining with coating before or during assembling
Definitions
- This invention relates to a chair base construction method, and more particularly is concerned with the method of making chair base structures of a type particularly suited for metal office chairs.
- the principal object of the invention is to provide a method of fabricating la chair base construction that is durable and pleasing in appearance, while sharply reducing the manufacturing costs.
- Another object of the invention is to provide a chair base construction method wherein the externally visible parts are pre-plated and interconnected by welding at junctures that are masked from external view by the preplated parts.
- FIG. 1 is a fragmentary side view of a chair base construction arranged in accordance with this invention and having a vertical center post structure shown in section and having mid-length portions of the legs broken out;
- FIG. 2 is a sectional view Ataken on line 2 2 of FIG. 1.
- the chair base arrangement illustrated for purposes of disclosure is designated generally at and is particularly suited for metal o'ice furniture.
- the chair -base is comprised of a vertical center post structure designated generally at 11, and a set of four leg elements 12 fixed to and radiating from the center post structure and equipped with casters C to support the chair base in the usual fashion.
- the center post structure includes a vertical inner shell 13, a vertical outer shell 14 supportingly engaged upon the inner shell at an upper region thereof and extending downwardly substantially coextensively therewith in outwardly spaced surrounding masking relation to the inner shell, and a hub assembly 15 comprising a hub sleeve 16 projecting vertically through the inner shell 13 to a location adjacent the lower end region thereof, and a hub support collar 17 encircling the upper end of the hub sleeve and engaging an end shoulder or flange 16E thereof to support the hub sleeve 16 from the shell structures.
- the inner shell 13 is formed of 14 gauge circular steel tubing having an O.D. of 1% inch
- the outer shell 14 is formed of .095 inch thickness circular steel tubing having an O.D. of 21A inches and having peripherally spaced wall openings about its lower end to present a separate downwardly opening mounting slot 14S for receiving each support leg 12.
- the outer shell 14 is slightly longer than4 the inner shell 13 and receives a washer 18 secured by weld 18W in counter-sunk relation within its upper end to provide a support shoulder or annular ledge resting upon the upper end face of the inner shell 13.
- Each of the support legs 12 is of hollow tubular form and is preferably formed of 14 gauge sheet steel stock to provide a vertically elongated generally rectangular profile in transverse section.
- Each leg 12 has its radially inner end portion projecting through a corresponding lowerend slot 14S of the outer shelland terminating in an end face 12E of cylindrically concave profile and abutting a corresponding lower end side wall portion of t the inner shell 13 such that lateral and upper extremities of such leg end face 12E define junctures with such shell side wall portions at locations that are masked by the outer shell 14 and such that lower extremities of such leg ,end face 12E are adjacent lower extremities of the inner shell 13 and of the hub sleeve 16 to define composite edge regions at locations that are also maskedby the outer shell 14.
- Weld l-ines 19 are provided along each of these junctures to secure the inner shell 13 and the legs 12 in rigid relation.
- Weld 20 is applied at each of these composite edge regions -to secure the hub sleeve 16, the inner shell 13, and the legs 12.
- the slots 14S dened by the wall openings at the lower end of the outer shell 14 are preferably of a profile matched to that of the legs to dispose the slots 14S in snug-fit'socketing relation about the legs 12. This presents a trim appearance and ensures that all weld locations are masked from view when the chair is in normal use.
- Each leg has its radially outer end opening endwise outwardly and also provided with a vertically downward wall opening 22 flanked by screw holes.
- each outer leg end presents a mounting socket of generally rectangular transverse profile, and an insert block 23, preferably of plastic, is nested in each such socket and has a generally corresponding transverse profile to seat snugly therein.
- Each block 23 has end face structure 23E presenting an end cap closing oli the mounting socket.
- Each block has a downwardly opening bore 23B flanked by screw holes for registry wit-h the wall opening 22 and screw holes of the outer leg end.
- the end face structure of each block 23 has a marginal edge liange 23F presenting a locating shoulder for external endwise abutment with the outer leg end face 12F to locate the bore 23B and screw holes in registry with the leg wall opening 22 and screw holes.
- Screws 24 secure the block 23 within the leg end, after which the support spindle 25 for each caster may be received within the -bore of the block.
- each of the legs 12 and the outer shell 14 are completely formed and then are pre-plated to provide a suitable external chrome coating thereon. Finishing these parts at this stage facilitates the plating operation to reduce the manufacturing costs materially. Pre-plating is made possible because all weld locations are effectively masked.
- Each of the pre-plated legs 12 is assembled in radially endwise directed abutment to a correspond-ing peripherally spaced side wall region at the lower end o-f the inner shell 13 to form line junctures ltherebetween.
- weld 19 is applied along each juncture to lock these parts together; the pre-slotted and pre-plated outer shell 14 with Washer 18 pre-welded at 18W is assembled onto the lower end of the completed hub assembly to provide a shell and hub subassembly which is then assembled onto the inner shell 13 to rest in supported relation thereon, with the outer shell 14 being located in surrounding relation to the inner shell and having its end slots 14S in socketing relation to the legs to mask the weld junctures, and with the hub sleeve 16 extending downwardly within the inner shell 13 and terminating adjacent lower extremities of the legs 12 and of the inner shell 13 to define composite edge regions at locations that are also masked by the outer shell; and finally, weld 20 is applied to these composite edge regions to secure the hub sleeve, the inner shell and the legs together.
- VVllat is claimed is:
- a chair base for swivel chairs which consists in preplat'ing an inner tubular shell, assembling and securing to said shell in radial directions, four, substantially rectilinear, preplated leg elements each having a substantially rectangular cross-sectional shape with the inner ends of said leg elements abutting said shell and with parallel vertical welds at juncture lines between the leg elements and the shell, mounting a preplated slotted outer shell over said inner shell and leg assembly -in radially spaced relation to the inner shell with the slots of the outer shell opening downwardly and being shaped and spaced to receive the rectangular leg elements in close tting relationship to thereby mask the welds, and then securing the outer shell to the inner shell and leg assembly in said radially spaced relation.
- said last step consists in providing an angular ledge in the upper interior portion of the outer shell adapted to rest upon the upper end of said inner shell, telescopically mounting a hub sleeve within the inner shell and providing annular iiange means on the upper exterior portion thereof adapted to bear against said ledge on the outer shell, and with the lower end of the hub sleeve extending approximately to the lower end of the inner sleeve, and welding the two last mentioned lower ends together to lock the outer sleeve to the inner shell and leg assembly.
Landscapes
- Chair Legs, Seat Parts, And Backrests (AREA)
Description
June l, 1965 METHOD OF MAKING A CHAIR BASE Original Filed June 19, 1963 1520622507" A ruce z/mszzew B. o. BUHRMASTER 3,186,064
United States Patent O 2 Claims. (Cl. 29-150) This application is a division of parent appl-ication Ser. No. 288,948 led June 19, 1963.
This invention relates to a chair base construction method, and more particularly is concerned with the method of making chair base structures of a type particularly suited for metal office chairs.
The principal object of the invention is to provide a method of fabricating la chair base construction that is durable and pleasing in appearance, while sharply reducing the manufacturing costs.
Another object of the invention is to provide a chair base construction method wherein the externally visible parts are pre-plated and interconnected by welding at junctures that are masked from external view by the preplated parts.
Other objects and advantages of this invention will be apparent during the course of the following description.
In the accompanying drawings forming a part of this specification, and in which like numerals are employed to designate like parts throughout the same;
FIG. 1 is a fragmentary side view of a chair base construction arranged in accordance with this invention and having a vertical center post structure shown in section and having mid-length portions of the legs broken out; and
FIG. 2 is a sectional view Ataken on line 2 2 of FIG. 1.
Referring now to the drawings, the chair base arrangement illustrated for purposes of disclosure is designated generally at and is particularly suited for metal o'ice furniture. Accordingly, the chair -base is comprised of a vertical center post structure designated generally at 11, and a set of four leg elements 12 fixed to and radiating from the center post structure and equipped with casters C to support the chair base in the usual fashion. In accordance with this linvention, the center post structure includes a vertical inner shell 13, a vertical outer shell 14 supportingly engaged upon the inner shell at an upper region thereof and extending downwardly substantially coextensively therewith in outwardly spaced surrounding masking relation to the inner shell, and a hub assembly 15 comprising a hub sleeve 16 projecting vertically through the inner shell 13 to a location adjacent the lower end region thereof, and a hub support collar 17 encircling the upper end of the hub sleeve and engaging an end shoulder or flange 16E thereof to support the hub sleeve 16 from the shell structures.
In the preferred form illustrated herein for purposes of disclosure, the inner shell 13 is formed of 14 gauge circular steel tubing having an O.D. of 1% inch, and the outer shell 14 is formed of .095 inch thickness circular steel tubing having an O.D. of 21A inches and having peripherally spaced wall openings about its lower end to present a separate downwardly opening mounting slot 14S for receiving each support leg 12. The outer shell 14 is slightly longer than4 the inner shell 13 and receives a washer 18 secured by weld 18W in counter-sunk relation within its upper end to provide a support shoulder or annular ledge resting upon the upper end face of the inner shell 13.
Each of the support legs 12 is of hollow tubular form and is preferably formed of 14 gauge sheet steel stock to provide a vertically elongated generally rectangular profile in transverse section. Each leg 12 has its radially inner end portion projecting through a corresponding lowerend slot 14S of the outer shelland terminating in an end face 12E of cylindrically concave profile and abutting a corresponding lower end side wall portion of t the inner shell 13 such that lateral and upper extremities of such leg end face 12E define junctures with such shell side wall portions at locations that are masked by the outer shell 14 and such that lower extremities of such leg ,end face 12E are adjacent lower extremities of the inner shell 13 and of the hub sleeve 16 to define composite edge regions at locations that are also maskedby the outer shell 14.
Weld l-ines 19 are provided along each of these junctures to secure the inner shell 13 and the legs 12 in rigid relation. Weld 20 is applied at each of these composite edge regions -to secure the hub sleeve 16, the inner shell 13, and the legs 12.
It should be noted that the slots 14S dened by the wall openings at the lower end of the outer shell 14 are preferably of a profile matched to that of the legs to dispose the slots 14S in snug-fit'socketing relation about the legs 12. This presents a trim appearance and ensures that all weld locations are masked from view when the chair is in normal use.
Each leg has its radially outer end opening endwise outwardly and also provided with a vertically downward wall opening 22 flanked by screw holes. Thus, each outer leg end presents a mounting socket of generally rectangular transverse profile, and an insert block 23, preferably of plastic, is nested in each such socket and has a generally corresponding transverse profile to seat snugly therein.
Each block 23 has end face structure 23E presenting an end cap closing oli the mounting socket. Each block has a downwardly opening bore 23B flanked by screw holes for registry wit-h the wall opening 22 and screw holes of the outer leg end. Preferably, the end face structure of each block 23 has a marginal edge liange 23F presenting a locating shoulder for external endwise abutment with the outer leg end face 12F to locate the bore 23B and screw holes in registry with the leg wall opening 22 and screw holes. Screws 24 secure the block 23 within the leg end, after which the support spindle 25 for each caster may be received within the -bore of the block.
In accordance with the construction method of this invention, each of the legs 12 and the outer shell 14 are completely formed and then are pre-plated to provide a suitable external chrome coating thereon. Finishing these parts at this stage facilitates the plating operation to reduce the manufacturing costs materially. Pre-plating is made possible because all weld locations are effectively masked.
The fabrication and assembly of the chair base is carried out in the following fashion. Each of the pre-plated legs 12 is assembled in radially endwise directed abutment to a correspond-ing peripherally spaced side wall region at the lower end o-f the inner shell 13 to form line junctures ltherebetween. Weld 19 is applied along each juncture to lock these parts together; the pre-slotted and pre-plated outer shell 14 with Washer 18 pre-welded at 18W is assembled onto the lower end of the completed hub assembly to provide a shell and hub subassembly which is then assembled onto the inner shell 13 to rest in supported relation thereon, with the outer shell 14 being located in surrounding relation to the inner shell and having its end slots 14S in socketing relation to the legs to mask the weld junctures, and with the hub sleeve 16 extending downwardly within the inner shell 13 and terminating adjacent lower extremities of the legs 12 and of the inner shell 13 to define composite edge regions at locations that are also masked by the outer shell; and finally, weld 20 is applied to these composite edge regions to secure the hub sleeve, the inner shell and the legs together.
While a preferred embodiment of the invention has been illustrated herein, it is to be understood that changes and variations may be made by those skilled in the art without departing from the spirit and scope of the appended claims.
VVllat is claimed is:
1. The method of making a chair base for swivel chairs which consists in preplat'ing an inner tubular shell, assembling and securing to said shell in radial directions, four, substantially rectilinear, preplated leg elements each having a substantially rectangular cross-sectional shape with the inner ends of said leg elements abutting said shell and with parallel vertical welds at juncture lines between the leg elements and the shell, mounting a preplated slotted outer shell over said inner shell and leg assembly -in radially spaced relation to the inner shell with the slots of the outer shell opening downwardly and being shaped and spaced to receive the rectangular leg elements in close tting relationship to thereby mask the welds, and then securing the outer shell to the inner shell and leg assembly in said radially spaced relation.
2. The method as set forth in claim 1 in which said last step consists in providing an angular ledge in the upper interior portion of the outer shell adapted to rest upon the upper end of said inner shell, telescopically mounting a hub sleeve within the inner shell and providing annular iiange means on the upper exterior portion thereof adapted to bear against said ledge on the outer shell, and with the lower end of the hub sleeve extending approximately to the lower end of the inner sleeve, and welding the two last mentioned lower ends together to lock the outer sleeve to the inner shell and leg assembly.
References Cited by the Examiner UNITED STATES PATENTS 782,932 2/05 Uhl 248-415 1,052,799 2/ 13 Collingsworth 108-83 1,182,889 5/16 Bolens 248-1881 2,218,583 10/40 Mantener 24S-188.7 2,262,216 11/41 Vunovich 311-79 2,470,397 5/49 Harter 24S- 188.7 2,996,735 8/61 Knock@ 29-458X FOREIGN PATENTS 79,103 10/51 Norway.
WHITMORE A. WIL' I`Z, Primary Examiner. THOMAS H. EAGER, Examiner.
Claims (1)
1. THE METHOD OF MAKING A CHAIR BASE FOR SWIVEL CHAIRS WHICH CONSISTS IN PREPLATING AN INNER TUBULAR SHELL, ASSEMBLING AND SECURING TO SAID SHELL IN RADIAL DIRECTIONS, FOUR, SUBSTANTIALLY RECTILINEAR, PREPLATED LEG ELEMENTS EACH HAVING A SUBSTANTIALLY RECTANGULAR CROSS-SECTIONAL SHAPE WITH THE INNER ENDS OF SAID LEG ELEMENTS ABUTTING SAID SHELL AND WITH PARALLEL VERTICAL WELDS AT JUNCTURE LINES BETWEEN THE LEG ELEMENTS AND THE SHELL, MOUNTING A PREPLATED SLOTTED OUTER SHELL OVER SAID INNER SHELL AND LEG
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US366363A US3186064A (en) | 1963-06-19 | 1964-05-11 | Method of making a chair base |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US288948A US3186669A (en) | 1963-06-19 | 1963-06-19 | Chair base construction |
US366363A US3186064A (en) | 1963-06-19 | 1964-05-11 | Method of making a chair base |
Publications (1)
Publication Number | Publication Date |
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US3186064A true US3186064A (en) | 1965-06-01 |
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ID=26965350
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US366363A Expired - Lifetime US3186064A (en) | 1963-06-19 | 1964-05-11 | Method of making a chair base |
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US (1) | US3186064A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3298086A (en) * | 1964-12-29 | 1967-01-17 | Gasser Chair Co Inc | Method of making a furniture pedestal |
US3391887A (en) * | 1966-11-14 | 1968-07-09 | Doerner Products Co Ltd | Chair base |
US3529337A (en) * | 1966-01-13 | 1970-09-22 | Pfaff & Kendall | Method of forming a pole structure |
US3724792A (en) * | 1970-08-10 | 1973-04-03 | D Thalenfeld | Apertured panel hook and method for manufacture |
EP0045151A2 (en) * | 1980-07-11 | 1982-02-03 | Wetherells Contracts Limited | Support bases for furniture |
US5791611A (en) * | 1996-08-09 | 1998-08-11 | Steelcase Inc. | Hub for chair base |
US6626404B2 (en) | 2001-07-13 | 2003-09-30 | Haworth, Inc. | Chair base |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US782932A (en) * | 1903-09-12 | 1905-02-21 | Toledo Metal Furniture Company | Revolving metal chair. |
US1052799A (en) * | 1912-03-22 | 1913-02-11 | Jack Collinsworth | Table. |
US1182889A (en) * | 1915-05-13 | 1916-05-16 | Gilson Mfg Co | Chair-base hub. |
US2218583A (en) * | 1937-12-13 | 1940-10-22 | John J Marthaler | Chair base |
US2262216A (en) * | 1939-07-10 | 1941-11-11 | Vunovich Eli | Table |
US2470397A (en) * | 1948-03-19 | 1949-05-17 | Harter Corp | Swivel chair base |
US2996735A (en) * | 1957-12-23 | 1961-08-22 | Louis T Knocke | Method for securing a plated washer to a plated nut or bolt by fusing the platings |
-
1964
- 1964-05-11 US US366363A patent/US3186064A/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US782932A (en) * | 1903-09-12 | 1905-02-21 | Toledo Metal Furniture Company | Revolving metal chair. |
US1052799A (en) * | 1912-03-22 | 1913-02-11 | Jack Collinsworth | Table. |
US1182889A (en) * | 1915-05-13 | 1916-05-16 | Gilson Mfg Co | Chair-base hub. |
US2218583A (en) * | 1937-12-13 | 1940-10-22 | John J Marthaler | Chair base |
US2262216A (en) * | 1939-07-10 | 1941-11-11 | Vunovich Eli | Table |
US2470397A (en) * | 1948-03-19 | 1949-05-17 | Harter Corp | Swivel chair base |
US2996735A (en) * | 1957-12-23 | 1961-08-22 | Louis T Knocke | Method for securing a plated washer to a plated nut or bolt by fusing the platings |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3298086A (en) * | 1964-12-29 | 1967-01-17 | Gasser Chair Co Inc | Method of making a furniture pedestal |
US3529337A (en) * | 1966-01-13 | 1970-09-22 | Pfaff & Kendall | Method of forming a pole structure |
US3391887A (en) * | 1966-11-14 | 1968-07-09 | Doerner Products Co Ltd | Chair base |
US3724792A (en) * | 1970-08-10 | 1973-04-03 | D Thalenfeld | Apertured panel hook and method for manufacture |
EP0045151A2 (en) * | 1980-07-11 | 1982-02-03 | Wetherells Contracts Limited | Support bases for furniture |
EP0045151A3 (en) * | 1980-07-11 | 1982-02-17 | Wetherells Contracts Limited | Support bases for furniture |
US5791611A (en) * | 1996-08-09 | 1998-08-11 | Steelcase Inc. | Hub for chair base |
US6626404B2 (en) | 2001-07-13 | 2003-09-30 | Haworth, Inc. | Chair base |
US6704990B2 (en) | 2001-07-13 | 2004-03-16 | Haworth, Inc. | Method of making chair base |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SECURITY PACIFIC BUSINESS CREDIT INC., 140 EAST 45 Free format text: SECURITY INTEREST;ASSIGNOR:WELLS FARGO BUSINESS CREDIT;REEL/FRAME:004843/0167 Effective date: 19870703 Owner name: SECURITY PACIFIC BUSINESS CREDIT INC., A CORP. OF Free format text: SECURITY INTEREST;ASSIGNOR:WELLS FARGO BUSINESS CREDIT;REEL/FRAME:004843/0167 Effective date: 19870703 |