US533733A - Tack-driving machine - Google Patents

Description

(No Model.) D. B. NYE.

TACK DRIVING MACHINE.

No.`533,733. Patented Peb. 5, 1895.

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UNITED Snfrss Barnett Orrrom DAVID B. NYE, OF CAMBRIDGE, ASSIGNOR TO THE BOSTON LASTING MACHNE COMPANY, OF BOSTON, MASSACHUSETTS.

TACK-DRIVING MACHINE.

SPECIFICATION forming part of Letters Eatent No. 533,733, dated February 5, 1,895 Application tiled July 16,1 894. Serial No. 517,632. (No model.)

.To @ZZ whom it may concern.-

Be it known that l, DAVID B. NYE, of Oambridge, in the county ot Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Tack-Driving Machines, ot' which the following is a specication.

This invention relates to the delivery nozzles for tack-driving machines, and particularly to the type of delivery nozzle shown in Letters Patent ot the United States No. 464,200, dated December l, 1891, said patent showing a tack-delivering nozzle composed of a rigid external shield or tube and an internal split or elastic guide-tube contained in the external tube and made shorter than the latter, the said elastic tube being adapted to yieldingly grasp the heads of the tacks driven through the nozzle and cause the tacks to assume a vertical position when being driven.

The present invention has for its object to increase the durability and efficiency ot the internal guidetube; and to this end it consists in a delivery nozzle composed of an external tube or shield, a sectional expansible guide-tube within said shield composed of a series of independently movable fingers or sections, and a spring surrounding the sec tional guide-tube and interposed between the latter and the external tube or shield, said spring being adapted to normally contract the sections ot the guide-tube and insure their operative relation to each other and to the tack which is being driven, regardless of the conditions of the said sections or lingers as to their inherent resilience or as to their connection with each other at the upper end of the guide-tube.

Of the accompanying drawings, forming a part ot this specification, Figure 1 represents a vertical section of a delivery nozzle provided with my present improvements. Fig. 2 represents a section on line 2-2 of Fig. 1. Fig. 3

represents a perspective view of the guide tube with its inclcsing spring detached from the external tube or shield, the said figures being made on an enlarged scale.

In the drawings--d represents the external tube or shield which is, or may be, of substantially the form represented in the Patent No. 464,200 above mentioned, and is screwed into a collar or holder substantially as shown in said patent. I

The internal guide-tube is composed of a series of sections or fingers c c, which are preferably made of sheet metal and are here shown as formed integral with a flanged tubular neck c', the flange o2 of which rests on a seat at the upper end of the external tube or shield a, this construction bein g substantially as set torth in Letters Patent No. 513,820,"

dated January 80, 1894. I do not limit mysell", however, to the manner of connecting the sections with each other and to the tube or shield a here shown, as said sections may be constructed and arranged in any suitable manner which will permit them to move iudependently and to be closed or pressed inwardly by the inclosing spring hereinafter described.

d represents a spring, which is preferably a rubber tube formed to surround the lingers or sections o and to be interposed between the outer surfaces of said sections and the inner surface of the tube or shield c. Said spring is preferably formed as shown in Figs. 1 and 2,so that its outer surface bears on the inner surface ot the tube or shield a, the spring acting, therefore, as an annular cushion which is compressed by the outward movement ofthe sections c caused by the passage of a tack through the guide-tube, and in its edort to expand exerts inward pressure on said sections, which presses them closely against the head of a tack passing through the guide-tube, causing the centering action described in Patent No. 464,200 above mentioned.

It will be seen that the annular spring inclosing the sectional guide-tube insures the contraction of said tube around the tack-head without regard to the condition of said sections as to their connection with each other and with the external tube or shield a; so that it said sections when connected by the tubular neck c in the manner shown should become set, and thus lose their elasticity; or it said neck should be cracked or broken, so that the sections are left independent of each other, the action of the guide tube will not IOO tilting a resilient hacking or support for the ngers and holding them yieldingly against a tack-head in the tube.

In testimony whereof I have signed my name to this specification, in the presence or' two subscribing witnesses, this 13th day of July, A. D. 1894.

DAVID n. NYE.

Witnesses:

C. F. BROWN, A. D. HARRISON.

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