US1573458A

US1573458A - Cushion handle

Info

Publication number: US1573458A
Application number: US15302A
Authority: US
Inventors: William A Smith
Original assignee: Ingersoll Rand Co
Current assignee: Ingersoll Rand Co
Priority date: 1925-03-13
Filing date: 1925-03-13
Publication date: 1926-02-16
Anticipated expiration: 1943-02-16

Description

Feb. 16 1926. 1,573,458

w. A. SMITH CUSHION HANDLE Filed March 13, 1925 INVE:VTOR. IYEZMumH- 51120471,

BY {g7 I, H/s ATTNEY Patented Feb. 16, 1926.

UNITED ST'A TES PATENT .OFFICE.

WILLIAM A. SMITH, 0E A'rnENs, PENNSYLVANIA, ASSIGNOB, To INGEBSOLLRAHD COMPANY, or master our, NEw JERSEY, A CORPORATION or New JERSEY.

CUSHION HANDLE.

Application filed March 1a, 1925. Serial No. 15,302.

To all whom it may concern:

Be it known that I, WILLIAM A. SMITH, a citizen of the United States, and a resident of Athens, county of Bradford, State of Pennsylvania, have Cushion Handle, of which the following 15 a specification accompanied by drawings.

This invention relates to fluld actuated rock drills, and more particularly to cushion handles for. that type of rock drill which 1s supported and guided by the operator.

One object of the invent1on is to prevent excessive shocks and vibration set up 1n the machine from being transmitted to the uiding handle of the machine. Another 0 ject is to produce a cushioned handle for a rock drill which is efficient in operatlon and may be readily adjusted to immediate require ments.

fication and in which similar reference characters refer to similar arts, v Figure 1 is a sidevlew in elevation and partly in section, of a rock dr1ll equ pped with a cushioned handle constructed 1n accordance with the practice ofthe mvention, and

Figure 2 is a transverse view partlydn section taken through Figure 1 on the hne 2-2, looking in the direction of the arrows. Referring to the drawings, the invention is shown embodied in a rock drill of the hand held type, in which a hammer cyhnder A, a front head B and a back head O are held in operative position by spring pressed side bolts D. 1

Disposed within .the front head B is a collared drill steel E. A yoked steel retainer F is supported pivotally by trunnions G on oppositesides of the front head, and the yoke portion of the retainer embraces the steel E in advance of the drill steel collar and cooperates therewith for retaining the drill steel within the front head B. A suitable hammer piston (not shown) is arranged within the cylinder A and reciprocates therein for delivering impact blows upon the drill steel E.

Pressure fluid is introduced into the machine through an inlet opening H and the distribution of the pressure fluid is effected invented a certain by a suitable valve (not shown) within the valve chest J.

In accordance with the practice of the invention, a handle is provided which cooperates wlth a pair of cylinders K arran ed independently of each other on the back head C, and provided with lateral flanges L which serve as a base for the cylinders. In this instance the cylinders K are held against longitudinal movement by the bolts D which extend through holes 0 of the flanges L.

Arranged within the bore P of the cylinders K are a pair of plungers Qhaving a bearlng portion 3 and a reduced extension S. In this instance, the extension S is threaded at its end to receive a nut T. The opposlte end of the plunger Q terminates in a circular flange U having a longitudinal bore V. Hollow sleeves W abut the outer faces of the flanges U. A similar sleeve X of suitable length is interposed between the flanges U and serves as a spacer for holdin the plungers Q, and consequently the cylinders K, in proper relation with each other. In this instance, a bolt Y extends through the sleeves W and X and the holes V of the flanges U and 'is provided with a suitable nut Z for clampin said sleeves firmly together, to form the andle for manipulating the machine.

In order to cushion the relative longitudinal movement between the plungers Q and the cylinders K in one direction, springs 11 are disposed within the bore P of the cylinders K. One end of said springs bears against a face 0 of the plunger Q, and the other end bears against the bottom Wall (Z of the cylinder bore P. Similar springs c are arranged beneath the cylinders K and are guided by the extension S to cushion the movement of the plungers in the opposite direction. One end of the springs e ears against the cylinder Wall (Z, and the other end-of said springs rests on the nuts T which also provide a means for adjusting the tension of the cushioning springs 72 and e. In this instance, the nut T is held against accidental removal by a pin f extending transversely through the extension S near its end.

The above described cushioned handle has been found to be very efficient, and the parts constituting the handle, as well as the springs, may readily be removed or may be replaced by removing the nuts T and without disturbing the assembly of the machine. a

I claim":

1. In a cushioning device for rock drills, the combination of a back head, cylinders formed separately and mounted on said back head, plungers to reciprocate within said cylinders, spring pressed side bolts for securing the cylinders to the back head, a pair of springs of equal diameter associated with each plunger to cushion longitudinal movement of the plungers in both directions, and a handle-supported .by the plungers for guiding the rock drill and holding the cylinders against rotation with-respect to said back head.

2. In a cushioning device for rock drills, the combination of a back head, a pair of cylinders secured removably to the back head, a lateral flange on each cylinder, spring pressed side bolts to cooperate with the lateral flanges for securing the cylinders to the back head, plungers to reciprocate Wltlllll the cylinders, a pair of springs of equal diameter associated with each plunger for cushioning relative longitudinal movement between the plungers and the cylinders in both directions, and a handle secured to one end of the plungers for guiding the rock drill and for holding the cylinders against rotative movement with respect to the back head.

3. In a cushioning device for rock drills, the combination of a backhead, a pair of independent cylinders supported by the back head, a lateral flange on each cylinder,

' spring pressed side bolts extending through the lateral flanges and the back head for securing the cylinders to the back head, plungers to reciprocate within the cylinders,

said plungers having a reduced forward extension, springs within the cylinders to cushion the movement of the plungers in one direction, springs beneath the cylinders to cushion the movement ofthe plungers in the opposite direction, nuts on said excylinders formed separately and mounted on said back head, a lateral flange on each cylinder, spring pressed slde bolts on opposite sides of the rock drill extending through the back head and the lateral flanges for securing the cylinders to the back head, plungers to reciprocate Within the cylinders, reduced forward extensions on the plungers, springs in the cylinders and on the extensions for cushioning the movement of the plungers in one direction, springs beneath the cylinders and on the extensions for cushioning the movement of the plungers in the opposite direction, nuts on an end of said extensions for holding the plungers and springs in operative position and for simultaneously adjusting the tension of the springs on the extensions, and a handle connecting the plungers for holding the cylinders against r-otative movement with respect 30 tile back head and for guiding the rock ril specification.

WVILLIAM A. SMITH.