US595840A

US595840A - washburn

Info

Publication number: US595840A
Authority: US
Publication date: 1897-12-21
Anticipated expiration: 1914-12-21

Description

(No Model.) 2 Sheets-Sheet 1,

T. W. WASHBURN. LOGKING DEVICE FOR ADJUSTABLE cums, &c.

' No. 595,840. Patented Dec. 21,1897.

INVENTOI? WITNESS-8:- w

BY w; MW W V 'W A TTOR/VE m -(No Model.) 2 SheetsSheet 2.

T. W. WASHBURN. LOCKING DEVICE FOR ADJUSTABLE CHAIRS, &c.

No. 595,840. Patented Dec. 21, 1897.

UNITED STATES PATENT ()FFICE.

THEODORE \V. WASHBURN, OF BALDWVINSVILLE, MASSACHUSETTS, ASSIGNOR TO GILMAN WAITE, OF SAME PLACE.

LOCKING DEVICE FOR ADJUSTABLE CHAIRS, 84G.

SPECIFICATION forming part of Letters Patent No. 595,840, dated December 21, 1897.

I Application filed November 30, 1896. Serial No. 613,892. (No model.)

T0 at whom it out concern.-

Be it known that I, THEODORE W. WAsH- BURN, of Baldwinsville, in the county of WVorcester and State of Massachusetts, have invented a new and useful Locking Device for Adjustable Chairs, Tables, and the Like, of which the following is a specification, reference being had to the accompanying drawings, in Which- Figure 1 is a perspective view of an adj ustable chair to which my locking device is applied. Fig. 2 is a detail elevation, and Fig. 3 is a detail elevation of the connection between legs B and the chair-seat legs. Figs. 4, 5, and 6 show two castings which form the looking device detached from the chair.

Chairs and tables and the like which are adjustable in height and which consist, essentially, of two pairs of legs pivoted together at or near a point midway of their length and supporting by means of pivots and links upon their upper ends a chair-seat or table-top and having means for controlling the position of the legs with relation to one another are well known.

My invention relates to chair-irons for folding chairs; and it consists, mainly, in a baseplate carrying a hub and a segment, all integral, the segment being notched to receive a pawl, in combination with a second base-plate with two projections integral with the baseplate, one to cooperate with the hub and the other to sustain the pawl, the two irons being connected by the pivot-bolt and the base-plate of one being connected with one leg, while the base-plate of the other is connected with the other leg, so that the legs are connected together when the hub and one of the projections are connected by the pivot-bolt, and

the legs can be held at various angles by caus-' ing the pawl to engage the different notches in the segment.

In the drawings the base-plate of the segment G and hub g is secured to leg E, and the base-plate with the two projections B and Z2 is secured to leg B, and these two castings G g and B b are connected by the pivot-bolt, and the pawl H then engages one of the notches in segment G. The pawl H is pulled in one direction by the spring h and in the other direction by the rod and handle H The novelty of my contrivance resides in making the segment and hub integral with the base-plate and the projection B and the pawl-carrying projection b integral with a second base-plate and combining them by means of the pivot-pin and the pawl. This connection makes the most strong and durable connection for such a chair yet produced. The base-plate of part 9 also gives additional strength to the pivot-point, and the strain is distributed by the connections over a considerable length of the legs B and E.

I have shown my invention as applied to a well-known form of adjustable chair, in which the chair-seat, having the usual short legs, is marked A, and the front legs, which are also rockers, are marked 13. The rear legs, of the chair-seat A are connected to legs B by the irons B and a, and the front legs of chairseat A are connected to legs E by links F, all as will be Well understood without further description.

My mechanism for connecting the crossed legs B and E is especially desirable in that class of chairs in which the legs B form rockers when in one position, for the reason that the projections Bf hold legs E above legs B when the chair is used as a rocking-chair.

What I claim as my invention is- The improved connecting mechanism for the crossed legs B and' E, comprising a baseplate carrying notched segment G and hub g, secured to leg E 5 a base-plate carrying projections B and 17 secured to leg B; pawl H pinned to projection b; and a pivot-pin connecting hub g and projection B, combined substantially as described.

THEODORE W. WASHBURN.

Witnesses:

BENJ. O. CUMMINGS, FEED L. NoRoRoss.