US485168A - Power-hammer - Google Patents

Description

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F. G. BROOKSBANK.

POWER HAMMER.

N0. 485,168. Patented Nov. 1, 1892.

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F. G. BROOKSBANK.

POWER HAMMER.

No. 485,168. Patented Nov. 1, 1892.

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POWER HAMMER.

No. 485,168. Patented Nov. 1, 1892.

- N NT R hmfiaww UNITE STATES PATENT OFFICE.

FREDERICK CLEMENT BROOKSBANK, OF CLEVELAND, OHIO.

POWER-HAMMER.

SPECIFICATION forming part of Letters Patent No. 485,168, dated. November 1, 1892. Application filed September 30, 1891- Serial No. 407,282. (No model.)

To all whom, it may concern.-

Be it known that I, FREDERICK CLEMENT BROOKSBANK, a citizen of the United States, residing at Cleveland, in the county of Guyahoga and State of Ohio, have invented certain new and useful Improvements in Power-Hammers, of which the following is such a full, clear, and exact description as will enable others skilled in the art to which it appertains to practice the same.

The primary invention herein described and claimed is applicable both to steam-hammers and pneumatic hammers. It has heretofore been impossible to do any considerable variety of work with such hammers without changing the dies on both the hammer-head and the anvil, because an effective blow could with safety be delivered only at a point beneath or substantially beneath the pistonrod. If the article to be struck be interposed between the anvil and the hammer head much to one side of the point at which the piston-rod is connected therewith, there is a strong tendency to bend or break said rod, and by far the greatest item of expense in keeping this style of hammers in repair is for replacing bent and broken piston-rods.

It is the object of my invention to provide a construction in this style of hammers,whereby a wide hammer-head may be employed in which a greater number of gates or dies may be formed and used than with the known forms of this class of hammers without serious danger to the device.

To this end it consists in the construction and combination of the parts, herein described, and pointed out definitely in the claims.

The invention is shown embodied in apneumatic hammer of that class which is shown in Letters Patent No. 394,483 and No. 394,484, granted December 11, 1888, to Jacob B. Perkins and myself as assignees of Gilbert Glossop.

In the drawings, Figure 1 is a side elevation of a pneumatic hammer containing my invention. Fig. 2 is a front elevation of the same. Fig. 3 is a vertical sectional view through both cylinders. Fig. 4 is a transverse sectional view on line 4 4 of Fig. 3.

I will now proceed to describe in detail the embodiment of my invention which the drawings show, calling attention to the fact that I do not intend to limit my invention to this specific form further than indicated by the claims.

Referring to the parts by letters, A A represent the sides of the hammer-frame.

B B represent parallel cylinders rigidly connected together. These cylinders are guided in a vertical path by suitable guides in the side frame, and they are suitably connected with a crank-shaft F, whereby they are simultaneously moved up and down in a vertical path. The interiors of these cylinders oommunicate with each other through open ports I) b, one in each end thereof. Each of the cylinders contains a piston C, which is connected by a piston-rod D with the hammerhead E, which is also guided in its vertical movement by its engagement with the frame A A. When the cylinders are being moved rapidly up and down through their connection with the crank-shaft, the pistons are given the vertical reciprocating movement well known in this class of hammers. By reason of the open ports connecting the tops and bottoms of these twin cylinders the density of the air compressed in the upper part of each will be the same, and therefore the pistons will move upward to exactly the same extent, and for the same reason they will move downward to exactly the same extent. It is obvious that with this construction a wider hammer-head may be employed than in a device where only one piston-rod is employed. A blow struck by the ham mer-head beneath the point of attachment of either piston or between these points will have little effect in bending or breaking the piston-rods, because each piston-rod acts as a brace to the other. There is therefore a distinct gain in strikingsurface, equal practically to the distance between the two rods.

With a view of simplifying and cheapening the construction of the above-described device both cylinders are formed in one piece of metal. The necessary inlet-ports H H in their upper ends converge and meet in a single port g in that part of the metal connecting the two cylinders, and a single checkvalve controls this port and consequently the amount of air admitted to both cylinders.

The inlet-ports in the lower ends of the 03 1- I inders similarly converge and meet in a single inlet-port g, having a check-valve, which in like manner controls the amount of air admitted in the lower ends of both cylinders.

The outlet-ports I I in both cylinders converge and unite to form a single outlet-port K. A valve L of well-known construction is provided for closing this port, and the pressure-piece M of any well-known construction is provided for operating this valve in the ordinary manner. If more than one outletport be employed for each cylinder, they will in like manner unite to form a single port, which may be controlled by a single valve. There is nothingnovel in the manner in which the outlet-ports are arranged with reference to the length of the cylinders or in the manner in which their valves are controlled. The arrangement and method of operating said valves which are shown in the drawings form but one of several which are well known.

Having thus described my invention, what. I claim as new, and desire to secure by Letters Patent, is

1. The combination of two parallel cylinders having open ports connecting them at both I with the hammer-head, substantially as and for the purpose specified.

2. The combination, in a pneumatic ha mmer, of two rigidly-connected parallel cylinders having open ports connecting them at both ends, means for imparting to said cylinders a reciprocating movement, a piston movable in each cylinder, a hammer-head, and a piston-rod connecting each piston with said hammer-head, substantially as and for the purpose specified.

3. The combination, in a pneumatic hammer, of two rigidly-connected parallel cylinders having open ports connecting them at both ends and having each an inlet-port in its upper end, which unite to form a single port, a check-valve for closing said port, an inlet-port in the lower end of each cylinder, which ports unite to form a single port, a check-valve for closing said port, a su table outlet-port in each cylinder, which unite'to form a single port, andasuit-able valve whereby said port may be opened and closed by mechanism outside of said cylinders, substantially as and for the purpose specified.

FREDERICK CLEMENT BRQOKSBANK.

Witnesses:

M. S. INGHAM, FRANK. MILLER.

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