US2272760A - Driving device - Google Patents

Description

1941 R. o. ALLEN 2,272,760

DRIVING DEVICE Filed Dec. 18, 1940 INVENTOR R0 OZIZZ'en/ M H a s ATTORNEY.

Patented Feb. 10, 1942 UNITED STATE nnrvnvc DEVICE Roy 0. Allen, Athens, Pa.,

assignor to' lngersoll- RandCompany, New York',N. "2., a corporation of'New Je y,

Application'December 1 s, 1940, Serial No. 370,670

{5 01am (01.1-46.1) I e r, 29 the front end of which constitutes a strik- This'invention relates to driving devices, and

more particularlyto a driving device-adapted for attachment to a pneumatically actuated hammer tool of the type employed for driving rail road spikes and similar articles. 9

One object of the invention is to enable the hammer tool to be conveniently retainedin the correct driving relationship with the spike, uneffected by the vibration incident to the operation of the hammer tool.

Another object is to enable the driving device to be expeditiously attached to and removed from the hammer tool without disturbing the assembled relationship of the parts constituting the hammer tool.

Other objects will be in part obvious and in part pointed out hereinafter.- a

In the drawing accompanying this specification and in which similar reference numerals refer to similar parts:

Figure 1 is an elevation, partly in section, of the front end of a hammer-tool and the driving device, and

Figure'2 is a transverse view taken through Figure 1 on the line 2--2.

Referring more particularly to the drawing, the driving device, designated in general by 26, is shown attached to a hammer tool 2| only the forward portion of the casing 22 of which is shown, and in the casing 22 is a hammer member 23 for actuating the driving device.

The driving device 20, constructed in accordance with the practice of the invention, comprises a shank 24 that extends into the front end of the casing 22 to receive the blows of the hammer 23, and on the shank 24 is a flange 25 to abut the front end of the casing 22 for limiting the distance that the shank 24 may extend into the casing.

The front portion of the flange is of reduced diameter to provide a forwardly facing shoulder 26 intermediate theends of the flange for engagement with a. retaining element, asfor example, the end coil 21 of a spiral spring retainer 28, of a well known type, having several of its rearmost coils in threaded engagement with the periphery of the casing 22. The coils intermediate those threaded to the casing and the one engaging the shoulder 26 encircle the casing loosely and are, therefore, quite free'to flex whenever the driving device isimpelled forwardly in the casing by the hammer 23 and to again return the driving device to the correct operative relationship with the hammer 23. ,On the front end of the fiange 25 ing surface 30 to seat upon the head of a spike 3| for driving the spike into a tie 32 to secure a rail 33 thereto. Owing to the peculiarcurvature of the driving surface of. the head of a spike the striking surface 30 is preferably flat throughout its extentso that, if required, the tool 2 l may be tilted relatively to the :spike and the full force of'the hammer 23 will be effective for-driving the spike into the tie; In order .tdmaintain the strikingss'urface in substantiallyithe correct relationship with the work the stem 23 is provided with a guiding element adapted to loosely receive the head of .the spike. r

The guiding element is preferably attached permanently to the stem 2.9. It lSJShOWl'l. as bein'gin the form of a sleeve 34 havinga bore 35 extending entirely therethrough and I consisting of enlarged'andreduced portions 35 and 3], re- 'spectively. The reduced portion.3'l of the bore is'in'slidable engagement with the forward-por- "tionof the stem 29 to assist in guiding the sleeve 34; and between the ends of the stem'29 isa collar 38 having a cylindrical surface 39lto cooperate with the surface of the enlarged portion 36 of the bore to guidetherearward end of the sleeve 34.

At the rearwarden'd of the sleeve 34 is an introverted flange 40 that overlies and cooperates with the rearward surface of the collar 38 to maintain the sleeve 34 on the stem 29. The flange 40 is preferably an integral portion of the sleeve and may be conveniently formed by crimping the end of the sleeve 34 inwardly toward the stem.

In order to normally maintain the sleeve in a position in which the frontrend of its bore will lie forwardly of the striking surface in readiness to receive the head of a spike 3|, a compression spring 4| is disposed within the enlarged portion 36 of the bore between the forward surface of the collar "and a shoulder 42 at the juncture of the portions 36 and 31 of the bore.

The operation of the device is as follows:

Whenever it is intended to drive a spike 3| into a tie the driving mechanism is so positioned,

that the striking surface 30 seats upon the spike. The reduced portion 31 of the sleeve 34 will then encircle the head of the spike 3|, and restrain the front end of the driving member against undue lateral movement during the operation of the tool 2| which may then be operated atja,

rapid speed with the fullassurance that substantially the correct, relationship will exist at all times between the driving mechanism and the is a stem 35 work.

As the head of the spike approaches the tie the front end of the sleeve 34 will abut the rail flange and remain stationary and thereafter only the driving mechanism will follow the spike until quickly attached to and from the hammer tool without necessitating the partial dismantling of the latter. As will be readily observed, the shank of the driving device is placed in the extreme front portion of the penumatic tool and the retainer 28 engages the driving device in the same manner as it does other types of working implements intended for use with the pneumatic tool.

I claim:

1. A driving device for use with a percussive tool having a casing and a reciprocatory hammer therein, comprising a driving member having a shank extending slidably into the casing to receive the blows of the hammer, a stem on the driving member to bear against an element intended to be driven, means on the driving member to abut the end of the casing for limiting the distance that the shank may extend into the casing, and means supported by the stem to maintain said stem in operative relationship with such element.

2. A driving device for use with a percussive tool having a casing and a reciprocatory hammer therein, comprising a driving member having a shank extending siidabiy into the casing to receive the blows of the hammer, a stem on the driving member to bear against an element intended to be driven, a shoulder on the driving member to abut the end of the casing for limiting the distance that the stem may extend into the casing, a sleeve slidable on and supported by the stem for maintaining the stem in operative relationship with such element, and means for retaining the sleeve on the stem.

3, A driving device for use with a percussive tool having a casing and a reciprocatory hammer therein, comprising a driving member having a shank extending slidably into the casing to receive the blows of the hammer, a stem on the driving member to bear against an element intended to be driven, a flange at the juncture of the shank and the stem to seat against the end of the casing for limiting the distance that the shank may extend into the casing, a sleeve slidabie on the stem for maintaining the stem in operative relationship with such element, portions on the stem and the sleeve cooperating with each other for retaining the sleeve on the stem, and a spring within the sleeve acting against the sleeve and the portion on the stem to urge the sleeve forwardly along the stem.

4.- A driving device for use with a percussive tool having a casing and a reciprocatory hammer therein, comprising a driving member having a shank extending slidably into the casing to receive the blows of the hammer, a stem on the driving member to engage an element intended to be driven and having a collar between its ends, a sleeve siidable on the stem encircling the collar, and an introverted flange on the sleeve overlying the rearward side of the collar to re tain the sleeve upon the stem.

5. A driving device for use with a percussive tool having a casing and a reciprocatory hammer therein, comprising a driving member having a shank extending slidably into the casing to receive the blows of the hammer, a flange on the driving member to seat against an extremity of the casing, a stem forwardly of the flange to engage an element intended to be driven and having a collar between its ends, a sleev slidable on the stem and encircling the collar, an introverted flang on the sleeve overlying the collar to retain the sleeve upon the stem, a shoulder within the sleeve, a spring acting against th shoulder and the collar to urge the sleeve forwardly along the stem, and a retainer on the casing cooperating with the flange to retain the stem in the casing. ROY o ALLEN

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