US1305083A - Bolt-puller - Google Patents

Description

V. H. FITZGERALD.

BOLT FULLER.

APPLICATION FILED SEPT.9, I918.

Patented May 27, 1919.

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VICTOR H. FITZGERALD, OF PORTLAND, OREGON.

I BOLT-PULLER.

Specification of Letters Patent.

Patented May 27, 1919.

Application filed September 9, 1918. Serial No. 253,232.

To all whom it may concern:

Be it known that I, VICTOR H. FITZGERALD, a citizen of the United States, residing at Portland, in the county of Multnomah and State of Oregon, have invented certain new and useful Improvements in Bolt-Pullers; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its object to provide an extremely simple and inexpensive, yet a highly efiicient, durable and in every way desirable tool for pulling bolts, spikes, etc., provision being made whereby spikes and the like of different diameters may be gripped and effectively drawn by the same tool without making any alterations or adjustments whatever therein and without bending or otherwise injuring the work.

With the foregoing in view, the invention resides in the novel construction of the tool hereinafter fully described, claimed, and shown in the accompanying drawings.

Figure 1 is a perspective view of the tool.

Fig. 2 is a longitudinal section.

Fig. 3 is a transverse section on the plane indicated by the line 3-3 of Fig. 2.

Fig. 4 is a perspective view with the gripping jaws removed.

Fig, 5 is a perspective of one of the jaws. Fig. 6 is a partial top plan view of the shackle bar and adjacent parts.

In the drawing above briefly described, the numeral 1 designates a preferably straight bar forming a handle for the tool, said bar being enlarged at one end to, form a foot 2 which is bifurcated,'the furcations 3 of said foot being preferably in the form of cylindrical pins as shown most clearly in Fig. 4. A pair of elongated cam jaws 4 preferably of substantially ovate formation in transverse section as seen in Fig. 3, are mounted pivotally upon the furcations 3, said furcations passing through bores 5 formed in the lobes 6 of said jaws. One side of each jaw, from its lobe to its comparatively pointed edge, is preferably provided with a plurality of teeth 7 for engagement with the spike, bolt or the like S, as seen in dotted lines in Figs. 1 and 3.

The free ends of the furcations 3 project beyond the cam jaws 4 and are provided with notches 4*- and 4 respectively; and a shackle bar 8 is reduced and pivotally mounted at one of its ends in the notch 4 of one of said furcations, the other end of said shackle bar being reduced and removably received in the notch 4 of the other furcation. The last named furcation and the bar 8 are provided with alined openings 9 to receive a cotter pin or the like 10 which removably anchors one end of the bar 8 and permits it to be swung outwardly when required into alinement with the furcation to which it is pivoted. This is necessary when applying difierent sized jaws or when replacing a broken or injured jaw; also when the tool is to be passed endwise around the spike or bolt instead of downwardly over the same. As shown clearly in Fig. 6, the shackle bar and one of the furcations are suitably rounded to permit unobstructed inward and outward swinging of the former when the pin 10 is removed. It will also be observed that the shackle bar is of sufficient dimensions and strength throughout the greater part of its length to prevent injury in case'the bolt or the like being pulled should come in contact with said bar.

Gravity may be relied upon to properly engage the jaws 4 with the work, but I prefer to provide a pair of spring, arms 14 for this purpose, said arms being formed by bending a single length of wire upon itself at its center and forming a loop 15 at the juncture of said arms. One or more screws or other fastening devices 16 are passed through this loop to secure the spring arms 14 to the handle 1, while the free ends of said spring arms are passed into sockets 17 formed eccentrically in the inner ends of the jaws 4.

The mere provision of the spring arms 14 would, except under excessive strain, limit the inward rocking movement of the jaws 4, but in most cases, it is preferable to form stops 18 on the inner ends of the furcations 3, said stops being by preference of V-shape as shown clearly in Figs. 3 and 4. The stops 1 8 are receivable in notches 19 formed in the inner ends of the jaws 4, the ends of said notches providing shoulders which abut the stops and limit the swinging movement of the jaws both outwardly and inwardly. By the provision of the stops and notches, there is no danger of the jaws turning completely over when under excessive strain. Such inversion of the jaws would not only be ,in-

jurious to the work, cause trouble and loss of time, but would break the spring arms 14. It is therefore highly desirable to provide the stop means shown and described, although it will be understood that some other equivalent arrangement might well be used should occasion so demand. 7

In drawing headed bolts or the like, it is often necessary to swing the shackle bar outwardly on its pivot in' order to dispose the jaws 4 on opposite sides of the bolt body, but when the bolt or spike is not provided with a head, the tool may simply be passed over the end thereof without molesting the shackle bar. Whenever it is necessary to release the b-ar in order to apply the tool, it is again moved into its proper place before using the tool, since otherwise there would be a tendency to spread the furcations 3.

From the foregoing, taken in connection with the accompanying drawing, it will be seen that I have provided a pulling tool which is extremely simple and inexpensive, yet highly eflicient and in every way desirable. Particular emphasis is laid upon the fact that the jaws 4 move more tightly into engagement with the work as the strain upon the tool and bolt increases, thus positively preventing slipping of the tool. It is also of advantage that whereas considerable difficulty has been encountered in removing long bolts, spikes and the like with the usual pulling tools, without so bending the former as-to require heating and straightening, the present tool .does not bend the spike or bolt in any mannerwhatsoever. V S'nce probably the best results are obtained from the details shown and described, they are by preference followed, but within the scope of the invention as claimed, numerous minor changes may well be made. I claim: 21. A bolt pulling tool comprising a bar having a bifurcated end, a pair of cam jaws rotatably mounted on the furcations of said end and spaced inwardly from the free ends thereof, and a shackle bar connecting said free ends of said furcations.

2. A bolt pulling tool comprising a bar having a bifurcated end, a pair of cam jaws 60 mounted rotatably on the furcations of said bifurcated end and spaced inwardly from the free ends thereof, a shackle bar pivotally mounted on the free end of one of said furcations, and means for detachably connecting said shackle bar with the other furcation.

3. A bolt pulling tool comprising a bar having a bifurcated end, a pair of cam jaws mounted rotatably on the furcations of said end and spaced inwardly from the free ends thereof, a shackle bar pivotally mounted on the free end of one of said furcations. for swinging into alinement therewith and having a reduced free end, the other furcation having a notch receiving said reduced end of said shackle bar, and a pin passing removably through said reduced end and said notched furcation.

4:. A bolt pulling tool comprising a bar having a bifurcated end, a pair of work gripping jaws mounted rotatably on the furcations of said end, the inner ends of said jaws being provided with relatively wide notches, comparatively narrow stops formed on the inner ends of said furcati'ons and received in said notches to abut the ends thereof, whereby to limitthe turning 'move ment of the jaws, and meansfor retaining said jaws upon said furcations.

5. A bolt pulling tool comprising a bar having a bifurcated end, a pair of cam jaws pivotally mounted on the furcations of said end, the inner "ends of said cam jawshaving eccentric sockets, a length of wire bent upon itself at its centerto form apair of. spring arms and a loop at their juncture, said arms extending into said sockets, and a fastener passing through said loop and securing'said spring arms to said bar. 7 y j In testimony whereof I have hereunto set 90 my hand. 7 7 VICTOR H. FITZGERALD.

Copies of this patent may bev obtained 'for five cents each; by addressing the Commissioner of Patents,

v Washington, D. G. i

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