US1768427A - Clamp for seat construction - Google Patents

Description

.lime 24, 1930. Q E STEVENS 1,768,427

CLAMP FOR SEAT CONSTRUCTION original Filed Feb. 14, 1927A Patented June 24, 1930 L CLARENCE E. s'rEvEns, or CLEVELAND, omo,

CORPORATION, F CLEVELAND., GEIQ-VA CORPQRATION 0F DELAWARE cLAivrr ForJ sEn'r lcons'ritncrroiv Original application filed February 14, 1327,

February 6, 1928.

rlhis invention relates to a clamp for seaty structures particularly, although it has utility in adjustable standards or posts tor other articles of furniture, being designed particularly for school seats and desks.

The present invention is a division of my copending application Serial No. 167,882, filed February 14, 1927.

One oi the objects of the invention is the provision of automatic locking means tor holding the seat post or the like in adjusted position.

Another object is the provision of a cornbined locking and rotation preventing means for the seat or desk post. y

The above objects are attainedY very effectively by my invention which-may be here briefly summarized as consisting lin certain novel details oi construction and combinations and arrangements ot parts which will be described in the specification and set forth in the appended claims. Y f

ln the accompanying sheet of drawings, Fig. 1 is a side view or" a seat and desk unit;

l Fig. 2 is a vertical sectional view on an enlarged scale showing the means which l employ for locking the posts in adjusted position as well as 'for preventing their rotation; and Fig. 3 is a transverse sectional view taken substantially upon the line 3-3 of Fig. 2. j

ln Fig. 1, the seat is a part of a unit which includes also a desk 11, the scat and desk being joined by a U-shaped tubular standard 12 with upstanding ends which receive, respectively, a seat supportingpcst 13 and a desk supporting post-14:, which posts slidingly engage theends of 'the tube and are adapted to be held at any desired elevation therein. The lower and horizontal portion of the tube is held slightly above the floor level by legs 15 and 16 which are secured to the upper'portions oi' the tube and project laterally therefrom. lt should be here stated that my invention is not confined to a seat and desk unit but may be employed equally well in seats Vand desks as separate units.l

The seat 10 is swivelled to turn upon the post 13, the latter remaining fixed. While the particular means illustrated for provid- 'serial No. 167,882; Divided and this application inea Serial N0. 252,105.

ing this swivel mounting constitutes nopart or my present invention, being covered in the application abovereferred to, yit maybe stated that at the top of the post 13 a laterally projecting, hardenedA disk 17 isrprovided having at its center a tubular boss or' bushing 17 whih islitted over the' end ofthe post and is secured thereto by a pin 19. The plane of the disk 17 is preferably slightly inclined with respect to the axis ofthe post 13 nssrenoa r.ro WHITE SEWING ivrAcnnvE so as to coincide with the inclination of. the

On the underside of the seat there is secured a plate .2O havingV a circular marginal flange 20a which is secured to 'the seat by screws 21, and inside o1 this flange the plate hasa circular portion 2Ob which isoifset with respect tothe flange away from the seat so as to form an annular pocket which receives the disk 17. At the center of the offset por vtion 20b of the plate 20 there is an opening through whichthe tubular portion 17a of the disk projects.

' Y The weight of the occupant of lseat 10 is transmitted to the upper end ot the post 13 and the disk 17, and to prevent undue wear between these parts there is interposed above the post 13 and disk 17 a hardened wearresisting disk 22, this being immediately beneath the seat 10, as illustrated in Fig. 2.

It will be observed that disk 17 is provided withl annular corrugations 17b so as to reduce the wear-resisting surface between the disk 17 and the disk' 22,V and also between the disk 17 and the offset portion 2()b of the plate 20.

` The means which l have provided'for permitting the easy adjustment ot' the height of the desk or seat and for holding thesame v'in'various positions yot yadjustmentconsists ci' a kdog 23 pivetally supported by a screw 24 between a pair ot laterally projecting fears'251'oi a sleeve or collar 25 which is` itted onto the'end of the tube 12. The inf ner edge ot this dog engages in a spline groove 13a ot the post 13, and this portion of the dog is provided with the equivalent of teeth, 'indicated at 26 in Fig. 2, which are adapted to ,engage the backwall oi groove, as illustrated in that figure. Furthermore, the groove engaging portion of the the dog is somewhat cam-shaped so that by depressing the outer end of the dog the post 13 or 14, as the case may be, will be released from the tube, allowing the post to be moved up or down. Furthermore, the dog is so shaped that when it is released it will swing by gravity into locking engagement with the post so as to grip it, the whole being so constructed that the weight of the seat and of the occupant on it, or the weight of the desk, has a tendency to increase the gripj ping engagement between the dog and post wardly therefrom, a dog pivotally supported between said ears outside said standard and having a cam portion extending into the standard and into said groove and frictionally engaging the post to support it in any adjusted position, and means for clamping said dog between said ears to prevent accidental movement of the dog.

In testimony whereof, I hereunto affix my signature.

CLARENCE E. STEVENS.

again grip the wood at the base of ther i groove in the post and thereby lock the post in its new position. The screwr 24 is then again tightened to prevent accidental or unauthorized operation of the adjusting means. When a downward adjustment is desired, the same procedure is followed, except that it is then necessary to hold the dog 23 out of contact with the post.

Having thus described my invention, I claim:

l. In an article of furniture, a tubular standard, a vertically grooved post mounted for vertical adjustment in said standard, said standard having a collar attached thereto at the upper vend thereof, said collar having a'lug extending outwardly therefrom, a dog pivotally connected with said lug outside said standard, said standard having a slot therethrough through which said dog extends into said groove, whereby the dog is adapted to engage said post to support the latter in any'adjusted position.

2. Inl an article of furniture, a tubular standard, a vertically grooved post mounted for vertical adjustment in said standard, said standard having a collar attached thereto at the upper end thereof said collar having a pair of spaced ears extending outwardly therefrom, and a dog pivotally supported between said ears outside said standard and having a cam portion extending into the standard and into said groove and frictionally engaging the post tosupport it in anyk adjusted position.

3. In an article of furniture, a tubular standard, a. vertically grooved post mounted for vertical `adjust-ment in said standard,

said standard having a collar attached there-- to at the upper end thereof, said collar Ahaving a pair of spaced ears extending out-

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