US1108706A - Dividers. - Google Patents

Description

H. P. COFFMAN.

DIVIDERS.

APPLICATION rum APR.24,1914.

Patented Aug. 25, 19%

Juvenioz HENRY FRANKLIN COFPMAN, OF JARRVILLE, CALIFORNIA.

DIVIDERS.

Specification of Letters Patent.

Patented Aug. 1914.

Apf lica tior. filed April 1914. Serial No. 834,185.

lie it known that .l, HENRY i {loFrB-Z. a citizen of the United Sta residing rd Cari-ville. in the county of lrinitv. finite 0! California. have invented certain new and useful Improvements in llividers: and I do hereby declare the folloni to he a full, clear, and exact description of the in ention, such as will enable others: :-,l illed in the art to which it appertanis to make and use the same.

The present invention i directed to improvements in dividers and has for its object to so construct an instrument of this character particularly designed for finding the e.\'.act center of a circle.

A further object of the invention is to provide a divider which can he easily and quickly adjusted for finding the centers of circles of difi'erent diameters, and further provide a deviee \\'liicl1 may he used to find the center of pipe sections.

With these and other objects in view, this invention resides in the novel tcaturer-a or construction, forn'iation, coinl'iination and arrangement of parts to be hereinafter more fully described, claimed and illustrated in the accompanying drawing, in which? Figure 1 is a side elevation of the device. Fig. 2 is an edge view. Fig. 3 view on the line 3 of Fig. 1. Fig. 4 is a partial central sectional view. Fig. :1 is a sectional view on line 5-3 of i. Fig. (3 is a fragn'ientary perspective view of one of the divider legs.

Referring to the drawin the. numeral 1 designates the head, the same being provided with grooves 2 wnich coar t with the curved edges 3 formed in H upper ends of the divider legs 4, said heing' held in the grooves the bowed leaf spring 5, the ends of vhich engage the notches 6 formed in the upper ends of said q The centering pin 7 is threaded in the. bore 8 formed in the head 1, and has its upper end provided with a knob 9 which is a sectional T when rotated will raise or lower said pin.

The upper end of the pin 7 isopcrable in the perforation 10 formed in the spring 5.

iivotally mounted upon the legs 4 are lugs ll. said lugs being: threaded for engagem nt hy the adjustingscrew 12, which oma'witelv threaded so that rotation in one dire tion will draw the legs toward each other, and when rotated in another direction the legs will he sgread. each end of said screw hein; provided with the opcrating hnoh l3. di-rshiod that the threads of the lugs 11 are pitched o positely.

ixed in spaced relation upon the central part of the scre\v,12 are disks 14 which span the pin 7 so that upon adjustment of the legs-'4 the point of the pin 7 will be at all times positioned at an equal distance from the points of the legs.-

lf-roin the foregoing description it will 'he seen that the pin 'T'can be readily elecentering pin, and a snob carried hv theupper eihl of the centering pin to facilitate the rotation of the pin, as and for the purpose set forth.

in testimony whereof I ailix my signature in the presence of two witnesses.

HENRY FRANKLIN COFFMAN.

Vtitnesses M. A. NonoYKn, W. J. Harmon.

an adjusting screw It will be of course un-

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