US1339453A - Staybolt-heading attachment for pneumatic hammers - Google Patents

Description

E. 0. GRIMES, 111., AND 0. F. BALTZLEY. STAYBOLT HEADING ATTACHMENT ron PNEUMATIC HAMMERS.

' APPLICATION FILED MAR, 20, 1919.

1,339,453. I I Patented May 11,1920.

Q *2 I. a Nag 1, Z @TTHIIIIIIH d INVENTOR BYMfG' whereby the operation UNITED srA'rEs PATENT OFFICE.

ELIAS omvnn GRIMES, an, or

TOWN, MARYLAND,

WESTMINSTER, AND GREEN F. BALTZLEY, 0F HAGERS- ASSIGNORS TO THE LIBERTY TOOL COMPANY, OF BALTIMORE,

MARYLAND, A CORPORATION OF MARYLAND.

STAYBOLT-HEADING- ATTACHMENT FOR PNEUMATIC HAMMERS.

Specification of Letters Patent.

Patented May 11, 1920.

, Application .filed March 20, 1919. Serial No. 283,750.

To all whom/2'13 may concern:

Be it known that we, ELIAS OLIVER GnIMns, Jr., and OREN F. BALTZLEY, citi- Zens of the United States, residents of Westminster, Maryland, and Hagerstown, Maryland, have invented certain new and useful Improvements in Staybolt-Heading At tachments for Pneumatic Hammers, of which the following is a specification.

Our invention is an improvement upon that disclosed in Letters Patent of the United States granted July. 17, 1917, #1233560, and concerns particularly means tachment may be observed by the operator and at the same time the tool will not be exposed in such manner-as to endanger the operator, the device serving as a guard against placing of the hand or finger in position to be subject to injury.

The invention consists in the features hereinafter described and particularly pointed out in the claims.

In the accompanying drawings:

Figure 1 is a vertical sectional view attachment.

Fig. 2 is a sectional view of a portion of Fig. 1, the line of section cutting the wall at a point between the sight openings.

Fig. 3 is a bottom plan view.

The general combination of elements of the apparatus is like that disclosed in the patent above referred to, including a tubular casing or body 1 having a socket at its upper end adapted to receive the lower end of the hammer barrel, a ram 2 slidably mounted in the casing and guided at its lower end through a washer or bushing 3 which is removably held by screw 3, the lower end of the ram being of conical form to act upon the rivet head. A partition member 1 is integrally formed in the casing and the ram is provided with a flange 5 which serves as a limiting stop in the upward movement of the ram. A spring 6 is interposed between the bushing 3 and the flange 5 to press the ram upwardly. A ring or collar 7 is arranged in the casing above the partition 4:. b

At the lower end of the casing a flange 1 is provided integrally with the casing and concentric with the axis of the ram, this flange extending down below the lower end of the ram when the latter is in its upperof the of the heading at most position. This flange, like in the patent above referred to, is intended to serve as a guide by bearing upon the head of the rivet so that the tool can be moved about the rivet eccentrically while maintained in connection therewith. In order to observe the operation of the ram upon the rivet head we provide openings at a and these openings extend through the body of the casing, the inner walls being inclined at a inwardly and downwardly and terminating at or near the bore of the casing in which the bushing 3 is located.

We prefer to make four of these open ings about the casing and these are of considerable extent, leaving intact a portion 6 between them. Through these openings the action of the tool on the rivet head may be observed and because of the formation of the openings at an inclination the metal of the casing at a is carried down to the normal level of the lower end of the ram so as to form guards against the accidental introduction of the fingers to a position where damage by the ram might result.

The inclined openings give a good view of the action of the ram. These openings are above the lower edge of the flange and leave the flange intact all around the circumference of the attachment.

It will be noted that the lower portion of the body or casing is enlarged in diameter and the inclined openings are formed through this enlarged portion so that the strength of the casing is preserved. The openings also cut partly through the upper portion of the flange at the point where it joins the body of the casing.

It will be noticed that the bore of the casing which contains the ram is of the full diameter,-throughout, of the flange 5 of the ram, so that when the bushing 3 is removed the ram, together with the spring, can be inserted from below and the flange 1 can be integral with the casing instead of being screwed into place.

Reverting to the sight openings it will be observed that the depending portions a of the body where the openings 0; are formed are spaced apart from the ram a distance equal to the thickness of the bushing 3 so that the edge of the ram lies some distance awayv from the lower edge of the sight opening or in other words, some distance away from the lower edge of the depending guard portion a due to the guide shoulder or bushing 3 and therefore a workman could not get his finger caught by the ram because of the depending guard together With the location of the edge of the ram at some distance away therefrom toward the axial center of the appliance. r

If we consider the relative location of the depending guard portion to the mouth of the sight opening a it may be said that this guard depends across thelevel of the mouth of the opening.

We claim as our invention:

1. In combination in an attachment for pneumatic hammers a casing having a socket at its upper end to receive the hammer barrel, a ram within the casing, said casing having a downwardly extending flange concentric with the ram to bear upon the side of the rivethead, and having also an opening inclining downwardly and inwardly through its body and within the circuit of the flange leaving an inner guard portion depending across the level of the mouth of the opening, substantially as described.

2. In combination in an attachment for pneumatic hammers a casing having a socket at its upper end to receive the hammer barrel, a ram Within the casing, said casing having a downwardly extendingportion depending across the level of the mouth ofthe opening, and a guide bushing for the lower end'of the ram said depending guard having its lower edge separated from the edge bushing.

I 8.-In combination a casing having an integral internal flange with a bore of one diameter throughout below said flange, a removable bushing at the lower end of the casing, means to hold said bushing in place and a ram guided in said bushing andhaving a flange of a diameter equal to the bore of the casing and a spring between the,

flange of the ram and the removable ing, substantially as described.

' In testimony whereof, we aflix our signatures. 7

bush- E. OLIVER GRIMES, JR; VOREN F. BALTZLEY.

of the ram 'by said guide

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