US455844A - friedrichs - Google Patents

Description

(No Modem f E. H. FRIEDRIGHS.

CLAMP FOR EASBLS.

No. 455,844. Patented July 14,1891.

Fl r3.2; F1133 W1 TNESSES. y INVENTOR l B Y M A TTORNEYJ'.

'mi norms Patins co woman-nm msmnsmn. nA n.

A provement.

UNITED STATES PATENT OFFICE.-

ERNEST H. FRIEDRICHS, OF NEW YORK, N. Y.

*CLAMP FOR EASE SPECIFICATION forming part of Letters Patent No. 455,844, dated July 14, 1891, Application tiled February 18, 1891. Serial No. 381|930. (Nomodel.)

To all whom t may concern:

Be it known that I, ERNEST H. FRIEDRICHS, ot' New York city, New York, have invented an Improved Clamp for Easels, of which the following is a specification.

This invention relates to a clamp for locking the lower adjustable sections of the easellegs to the upper fixed sections.

The invention consists in the various features of improvement more fully pointed out .in the claims.

In the accompanying drawings, Figure 1 is an elevation of an easel provided with my im- Fig. 2 is a vertical longitudinal section through the clamp; Fig. 3, a rear view thereof. Fig. lis a verticallongitudinal secsection7 partlyin side view, of a modification; and Fig. 5, a rear View thereof.

The letters arepresent the upper sections of the legs of an easel, and a are the adjustable sections, the whole constituting an adjustable tripod. The sections a are provided with straps b, that embrace sections a', while the sections aare provided with straps b', that embrace sections a. Thus the sections a a are interlocked, and the sections a are free to be slid up or down to any desired extent, which permits the easel to be adjusted to any unevenness of the ground.

In order to clamp the sections a when adjusted to the sectionsa, I employ the following construction: Each section o. is perforated near its upper end, and into this perforation there is screwed a metal socket or sleeve c, having a head c', as shown. The socket is provided with a tapped longitudinal bore for the reception of a thumb-screw d. The length of the socket c is such only that it does not project entirely through the thickness of the section a,but terminates opposite cut into the inner face of Tithin this mortise there is a flat mortise a2, section a.

placed a brake disk or plate adapted to be forced by screw d against section d and to thus clamp the sections da by pushing them outward and againstthe straps b b.

In Figs. 2 and 3 the brake consists of a iiexible plate e, pivoted within the mortise g2 by screw f, upon which it vibrates as it is pressed outward by the screw d. When the screw CZ is withdrawn, the plate resumes its normal position and re-enters the mortise d2 by its own elasticity. In Figs. 4 and 5 lthe placed by a rigid end of the screw d. This disk is pushed outward againstsection a, or is made to recede therefrom by the corresponding motion of the screw.

pivoted plate e is re- My improved clamp may also be applied to the slide canvas.

The advantage of my durable, will not split orinjure the \vood,and is very effective.

What I claim isg, that engages the upper edge of the l. The combination of a tripod composed of interlocked sections aand sections a., having mortises a2, with threaded sockets c,inserted in sections a', screws cl, received by said sockets, and with brake-disks placed within mor-v tises 0.2 and operated by screws d, substantially as specified.

` 2. The combination of a tripod'composed of interlocked sections@ and sections a', having mort-ises n.2, with the threaded sockets c, inserted in sections 0.', screws d, received by said sockets, and with pivoted flexible brakedisks e, placed within mortises a2 and operated by the screws, substantially as specified.

ERNEST H. FRIEDRICI-IS. Vitnesses:

F. v'. BRIESEN, A. JoNeHMANs.

disk e', mounted upon the' clamp is that it is

Images