Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS3183861 A
Publication typeGrant
Publication dateMay 18, 1965
Filing dateMay 2, 1963
Priority dateMay 2, 1963
Also published asUS3177035
Publication numberUS 3183861 A, US 3183861A, US-A-3183861, US3183861 A, US3183861A
InventorsHalstrick Robert T
Original AssigneeAmerican Metal Works Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 3183861 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

May 18, 1965 R. T. HALSTRICK STOOLS 2 Sheets-Sheet 1 Filed May 2, 1963 INVENTOR. 7 ROBERT I HALSTR/CK ATTORNEY y 1965 R. T. HALSTRICK 3,183,861

STOOLS Filed May 2, 1963 2 Sheets-Sheet 2 50 I is L 5/ 1 INVENTOR. ROBE/P7 7. HALSTR/CK gmbumwm ATTORNEY United States Patent 3,183,861 STOOLS Robert T. Halstrick, Huntingdon Valley, Pa., assignor to American Metal Works, Inc., Philadelphia, Pa., a corporation of Pennsylvania Filed May 2, 1963, Ser. No. 277,546

1 Claim. (Cl. 108-144) This invention relates to stools primarily for shop use.

Stools used in work shops frequently require adjustments as to height upon change of shift or upon change of the operations to be performed. Such stools also, are frequently provided with or workers desire the attachment thereto of adjustable back rests.

It is the principal object of the present invention to provide improvements in stOOlS for industrial or shop use with which a quick adjustment of seat height can be effected.

It is .a further object of the present invention to provide improvements in stools for industrial or shop use having a self locking height adjustment of the stool seat.

It is a further object of the present invention to provide a stool having a self locking height adjustment which can be easily unlocked for setting to a different height.

It is a further object of the present invention to provide a stool and a back rest therefore which is quickly and easily applied.

It is a further object of the present invention to provide a stool and back rest of the character aforesaid which is quickly and easily adjustable with simultaneous adjustment of the backrest angle and locking of the adjustment at any desired angle.

Other objects and advantageous features of the invention will be apparent from the description and claims.

The nature and characteristic features of the invention will be more readily understood from the following description taken in connection with the accompanying drawings forming part thereof, in which:

FIGURE 1 is a view in perspective of a stool in accordance with the invention;

FIG. 2 is a horizontal sectional view, enlarged, taken approximately on the line 22 of FIG. 1;-

FIG. 3 is -a vertical sectional view, further enlarged, taken approximately on the line 3-3 of FIG. 2;

FIG. 4 is a horizontal sectional view, still further enlarged, taken approximately on the line 44 of FIG. 3;

FIG. 5 is a perspective view of a locking pin for height adjustment of the legs;

FIG. 6 is a side elevational view of the stool shown in FIG. 1 with the back rest in place;

FIG. 7 is -an enlarged fragmentary horizontal view showing the details of the mounting of theback rest;

FIG. 8 is a fragmentary sectional view, enlarged, taken approximately on the line 88 of FIG. 7; and

FIG. 9 is an exploded perspective view of the structure shown in FIGS. 6, 7 and 8.

It should, of course, be understood that the description and drawings herein are illustrative merely and that various modifications .and changes can be made in the structure disclosed without departing from the spirit of the invention.

Like numerals refer to like parts throughout the several views.

Referring now more particularly to FIGS. 1 to 5, inclusive, of the drawings a stool 15 is shown having a seat'16, of wood or other preferred material from which main legs 17 extend downwardly and outwardly.

At the lower ends of the main legs 17 a horizontal lower bracing frame 18 is provided, having horizontal wall portions 19 and vertical wall portions 20 and with an open central space 21.

Each of the main legs 17 is preferably formed as a metal stamping of channel section with a web 22 and side flanges 23 providing a square cross section. Rims 24 extend outwardly, in flared relation to the side flanges 23 for stiffening.

The wall portions 19 and extend to and engage with the rims 23, and are secured thereto in any desired manner, such as by spot welding. The frame 18, at the corners, has openings 25 for the passage of the leg ex tension tubes 26. The leg extension tubes26 can be of any desired cross section but are preferably circular. At the lower ends of the tubes 26, rubber tips 27 can be provided if desired.

In order to position the tubes 26 longitudinally with respect to the main legs 17, the main legs 17, in spaced rela tion above the lower edge 28 thereof, are provided with opposite vertically elongated rectangular slots 29 the axis of the slots 29 preferably being vertical or plumb and accordingly in tilted relation to the web portions 22.

The extension tubes 26, at spaced locations, are preferably provided with opposite square openings 30, tilted with respect to the longitudinal axis of the tubes 26, and for selective alignment with the slots 29. Locking pins 32, insertable through the slots 29 and through a pair of openings 30 in the tubes 26, permit of height regulation of the seat 16.

A contiguous pair of main legs 17, at one side, are each provided with vertically spaced openings 33 for the attachment of back rest support hangers or sockets 35 by bolts 36.

The back rest structure, shown in detail in FIGS. 6 to 9, inclusive, includes a back support frame 38 of round wire having spaced downwardly extending lower ends 39 which engage in the hangers 35. The frame 38 has opposite rearwardly and upwardly extending portions 40, upright converging portions 41, horizontal forwardly extending arms 42 and a horizontal connecting and clamping rod portion 43.

The back rest 45, of any preferred shape, and preferably with an interior metal plate 46 covered with padding 47, is shown as arcuate in horizontal section.

A hanger 49 preferably made of a metallic strip has securing portions 50 shaped to conform to the rear of the plate 46, has rearwardly extending side sections 51, and a central section 52. Extending from the securing portions 51 angularly disposed or flared stops 53 are provided.

The central section 52 has a horizontal slot 54 therealong which extends into and forwardly along the side sections '51. The slot 54, intermediate its ends, has an enlarged opening 55 for the insertion of the head 56 of a bolt 57. A pair of bolts 57 extend forwardly through opening 53 in the body of a clamping cap 59. The cap 59 has rearwardly extending clamping arms 60 which extend along the side sections 51 and have recesses 6-1 to engage the rod portion 43 of the frame 38. Wing nuts 62, on the bolts 57 permit of tightening the cap 59 to the desired extent with the back rest 45 at a selected position in pivotal adjustment on the rod portion 43. The cap 59 preferably also has upper and lower rims 63 to facilitate the positioning of the cap 59.

It will thus be seen that the seat 16 can be adjusted to the desired height by insertion of the pins 32 through the slots 29 and selected openings 30. The Weight of the user on the seat 16 by the downward force applied therefrom through the main legs 17 and the cor-responding upward force applied through the tubes 26 effects a locking of the tubes 26 and legs 17. The lock can be released by a blow struck against the tops of the tubes 26 above the frame.

The back rest 45 can be readily mounted on the back support frame 38. For this purpose, the hanger 49 has the clamping rod portion 43 inserted thereinto and positioned sidewise by the flared stops 53. The bolts 57 are inserted into the slot 54. The enlarged opening 55 permits successive insertion of the bolt heads 56 and sliding of the bolts 57 away from the opening 55 on each side.

The clamping cap 59 is then put in place with the bolts 57 extending through the openings 58 and with the clamping arms 60 engaging the clamping rod 43 at the recesses 61. The Wing nuts 62 are then applied to the bolts 57. The back rest 45 is then tilted as desired and adju-stably locked in position upon tightening of the Wing nuts 62 I claim:

In a stool having a seat, main legs extending downwardly from and in diverging relation to said seat, said legs each being of channel shape With opposite side flange portions and flaring rims extending outwardly from said side flange portions, a bracing frame at lower portions of said legs engaged with said rims in bridging relation to said side flange portions and retaining said legs in spaced relation, leg extension tubes at the lower ends of said main legs, and self locking means for adjustably connecting said extension tubes and said main legs and retaining said tubes and legs in locked condition including in said opposite side flange portions of said main legs transversely aligned elongated slots With an opposite parallel pair of longer side margins and with their longer margins disposed at an inclination With respect to the longitudinal axis of said main legs, openings of square shape in said tubes for selective alignment with said slots, and locking pins square in shape with opposite faces extending through said slots and selected ones 01f said openings and with one of said locking pin faces disposed for engagement with corresponding ones of said margins of each said slot and the other of said locking pin faces engaging a remote portion of said square shaped opening.

References Cited by the Examiner UNITED STATES PATENTS 994,598 6/11 Martin 248157 1,711,725 5/29 Edwards 248354 2,711,787 6/55 Hallowell 297451 2,917,104 12/59 Cottle 248-457 3,000,669 9/61 Silve-rman 297-451 FOREIGN PATENTS 921,092 6/47 France.

888,312 8/ 53' Germany.

FRANK B. SHERRY, Primary Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US994598 *May 16, 1910Jun 6, 1911William H MartinAdjustable stand.
US1711725 *Dec 5, 1927May 7, 1929Edwards Jasper GAdjustable brace
US2711787 *May 2, 1951Jun 28, 1955Standard Pressed Steel CoKnock-down chair
US2917104 *Apr 18, 1957Dec 15, 1959Martin RichtelAdjustable chair
US3000669 *Sep 21, 1959Sep 19, 1961Silverman Rudolph JChair bracket
DE888312C *Oct 4, 1951Aug 31, 1953Siegfried KoesterLoesbare Vorrichtung zur starren Verbindung loser, teleskopartig ausziehbarer Rohre fuer verlaengerbare Bau-Ruestboecke u. dgl.
FR921092A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3595180 *Feb 10, 1969Jul 27, 1971Module Computer CorpAdjustable height device for data processing equipment
US3604372 *Sep 30, 1968Sep 14, 1971Samsonite CorpConnector for folding table leg
US5333825 *Sep 25, 1992Aug 2, 1994Christensen Emeron PFurniture elevating device
US5842742 *Jan 6, 1997Dec 1, 1998Hoshino Gakki Kabushiki KaishaMechanism for preventing the shaking of a drum chair
US5873312 *Sep 19, 1997Feb 23, 1999Daimlerchrysler CorporationAdjustable parts holder
US6739560 *Feb 12, 2003May 25, 2004Palmer-Snyder Furniture CompanySelf-adjusting anti-glide apparatus
US7850239 *Jul 10, 2008Dec 14, 2010Harry StillChair with spring actuated rear legs to minimize muscle strain
US20050247239 *May 4, 2004Nov 10, 2005Newhouse Thomas JAdjustable height casegood and desk
US20050248239 *Dec 17, 2004Nov 10, 2005Hekman Furniture CompanyAdjustable height casegood and desk
US20070046077 *Aug 12, 2005Mar 1, 2007James FangDetachable bath bench
US20100295350 *Dec 18, 2009Nov 25, 2010Daniel Seth BarmanErgonomic musician's stool
US20130099541 *Oct 21, 2011Apr 25, 2013Yu-Pu HungChair structure
US20150265057 *Mar 19, 2015Sep 24, 2015Alexander Vagarshakovich AtayanChair of meditative mobilization
U.S. Classification297/311, 403/108, 297/344.18, 248/157, 248/188.5
International ClassificationA47C7/40, A47B91/02, A47C7/42, A47B91/00
Cooperative ClassificationA47C7/42, A47B91/02
European ClassificationA47C7/42, A47B91/02