Cabinet-maker s clamp
US 319517 A
Description (OCR text may contain errors)
UNITED STATES ATENT EEIcE.
WILLIAM E. SHELDON, OF MEDFORD, MASSACHUSETTS.
SPECIFICATION forming part of Letters Patent No. 319,517, dated June 9, 1885.
Applicai ion filed October 27,1884. (No model.) I
.To ctZZ whom it may concern:
Be it known that I, WILLIAM E. SHELDON, of Medford, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Cabinet-Makers Glampswof which the following is a specification.
This clamp is intended as an improvement over those now generally in use in cabinetmakers shops for holding tightly together glued pieces, &c.; and the invention relates to the tailbloek and the means whereby the same is held in any desired position.
In the accompanying drawings, in which similar letters of referenceindicate like parts, Figure 1 is a view in perspective of my irnproved clamp. Fig. 2 is an enlarged plan view of the tail-block in position, a portion of the plate II being represented as broken out. Fig. 3 is a longitudinal vertical section of the same.
A represents the bar, provided, as usual, with the transverse grooves c on its under side. B is the head-block, provided with the screw C, and placed in the frame D so as to be adjustable vertically therein, all substantially as described and shown in Letters Patent No. 295,589, granted to Ine March 25, 1884. E is the tail-block, ehambered at c, such chamber being covered by the plate I-I, 'which is secured to the beveled portion, as shown. I is 4the usual swingingbar or catch, adapted to hold the tail-block in any desired position against the pressure of the screw C by catching in one of the grooves a. This swinging bar lies in the chambere and extends downward around the bar A, as shown. It is of course necessary that the swinging bar l should be held up against the under side ofthe bar A, and should extend toward the head-block in such a manner that it will be sure to catch in a groove a when the tail-block is moved, and hold the latter iirmly in position. I accomplish this in a very simple manner by attaching one end of a coiled spring,fl, at L, to
the swinging bar I, and allowing the other end, K', to extend downward and press upward against the under side of the plate H. Thus the action of the swinging bar is made automatic and positive in a simple and eftiy cient manner.
It will be observed that the upper end of the link I is placed sufficiently to the rear of the centre of the block E to prevent said block from kicking up behind. The coiled spring K, being secured within the chamber e and concealed by the face-plate H, prevents the lodgment of glue or other foreign matterbeneath the spring.
I am aware that tail-blocks have heretofore been provided with a link operated by a tlat exposed spring, and with a guide-plate working in grooves extending the entire length of the bar A, to prevent the rear end of the tailblock from tilting, such being shown in Patent No. 131,195, granted to J. A Traut, under date ofSeptember 10, 1872', butsuch construction is objectionable in that thegrooves and flat sprin g are liable to become clogged with glue, which is always used in cabinet-makers work. By means of my improvement this objection is entirely obviated.
Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, isl In a cabinet-makers clamp, the combination, with the bar A, grooved at c, and pro. vided with the usual head-block and screw, of the tail-block E, chainbered at e and provided with the coveringplate H, the swinging bar I, and the spring K, secured at one end to the swinging bar in the chamber e, and with the free end extending downward and bearing against the under side of the plate I-I, vsubstantially as and for the purpose set forth.
YVILLIAM E. SIIELDON.
HENRY W. WILLIAMs, J. M. HAR'INE'IT.