US1719143A - Percussive tool - Google Patents

Description

July 2, 1929.

F. M. SLATER P RcUsKuvE TOOL gr %I INVENTOR.

Fz'e M13710! 42 HIS AT RNEY Patented July 2, 1929.

UNITED STATES 1,719,143 rarer orrijcs.

FRED M. SLATER, or EASTON, PENNSYLVANIA, 'assienon T0 monasoLL-ieann c M PANY, or JERSEY CITY, NEW JERSEY, A oonroaa'rron on NEWIJERSEY.

PERCUSSIVE TOOL.

Application filed May 2, 1927. Serial No. $8,202.

This invention relates to fluid actuated percussive tools, but more particularly to throttle valves and their controlling means for tools of this type. r

The objects of the invention are to simplify and lighten the construction of tools of this type and to enable the admission of pressure fluid into the tool to be controlled by pressure ordinarily applied to the handle for holding the said tool to the work.

Other objects will appear hereinafter and to all of these ends the invention consists of the combination of elements and arrangement of parts having the general modeof operation substantially as hereinafter described and claimed and illustrated in the accompanying drawings, in which F i gure l is a sectional elevation of so much of a percussive tool as will serve to illustrate the invention, and

Figure 2 is a side elevation of the handle.

Referring to the drawings the invention is shown embodied in a percussive tool of the coal pick type having a barrel A in which is disposed a reciprocatory hammer piston B for deliverin blows on a working implement (not shown).

On the rearward end of the barrel A is screwed a handle U in. the frontend of the body portion l) ofwhich is formed a recess E consisting of an outer threaded portion F for engagement with threads G on the end of the barrel A and a rearward smooth annular portion which serves as a valve chest H. T he body portion D thus acts as a back head for the barrel A and also serves toclamp a valve seat J located in the valve chamber H against the rearward end of the barrel A.

The rearward end of the valve seat J has two converging surfaces K on which is disposed a distributing valve L of the oscillatory flat plate type pivoted on a pin 0 anchored in the valve seat J. Inlet passages P and Q leading to the rearward and front ends re-' .spectively of the barrel are formed 1n the seat J and are controlled by the valve L.

Pressure fluid for actuating the tool may be conveyed from a suitable source of supply (not shown) into a connection R which communicates at its inner end with a throttle valve chamber S formed in one slde of the body portion D. The valve chamber S preferably lies in a plane paralleling the longitudinal axis of the tool and its rearward portion T is in this instance reduced somewhat to form a valve seat U on which is seated a spring pressed throttle valveV. The throttle valve controls the admission of pressure fluid fromthc valve chamber S into the reduced portion T from whence it may flow into the valve CllQShITl through a passage N which affords communication between the reduced portion, T of the valve chamber and the valve chest H.

In the present instance the throttle valve V is provided with a'stem X guided by a rearwardly extending projection Y on the body portion D and extending with its free end beyond the rearward end of the said projection Y.

In accordance with the invention means are provided for unseating the throttle valve V and also for guiding the tool with respect to the work. To this end a handle grip Z is pivoted on a pin Z extending through lugs F) on one side of the body portion D and the opposite or free end of the handle grip Z terminates at a point in line with the projection Yv wherewith it is in slidable engagement by means of a pair of downwardly extending walls 0 which form a slot (Z into which the end of the projection Y'extends for'holding the free end of the handle grip against lateral movement with respect to the body portion. Preferably a removable wearing piece 0 is inserted in the handle grip Z to protect the handle grip Z against such wear as is usually caused by the stem X.

In order that thehandle grip Z may be held against too free movement about its pivotal point the said handle grip Z is provided with a surface f near its pivotal point to abut a surface 9 on the side of the body portion D.

These surfaces 7 and g are so located that when the throttle valve is closed only a slight space may exist between the rearward end of the stem X and the wearing piecee.

The present invention has been found tobe particularly desirable for use in connection with percussive tools of the coal pick type V I claim: a

A fluid actuated percussive tool, comprising a barrel, a reciprocating piston, a distributing valve at the rearward end of the barrel, a handle secured to the barrel, said handle having a body portion forming the back head of the tool, a projection on the body portion extending rearwardly of said body portion, a

7 spring pressed throttle valve in the body portion having a stem extending slidably through the projection and adapted to proj ect from the rearward end of the projection, a handle grip for the tool secured to and pivoted on only one end of the body portion and adapted to be pressed With its free end FRED M. SLATER.

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