US1327331A

US1327331A - Drop-hammer

Info

Publication number: US1327331A
Application number: US263917A
Authority: US
Inventors: William A Knapp
Original assignee: Individual
Current assignee: Individual
Priority date: 1918-11-23
Filing date: 1918-11-23
Publication date: 1920-01-06
Anticipated expiration: 1937-01-06

Description

W. A. KNAPP.

DROP HAMMER.

APPLICATION FILED NOV. 23. ms.

1,327,331, Patented Jan. 6,1920.

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WILLIAM A. KNAPP, 0F WAsrriNeroiv, nrs'rnror or COLUMBIA.

DROP-HAMMER.

Specification of Letters Patent.

Application filed. November 23, 1918. Serial N 0. 263,917.

To all whom it may concern:

Be it known that I, I/I ILLIAM A. KNA'PP, a citizen of the United States, and resident of Washington, District of Columbia, have invented certain new and useful Improvements in Drop-Hammers, of which the following is a specification.

My invention is designed to provide a drop hammer, the stroke of which will be under the complete control of the operator, enabling him at will to get a lengthof stroke or drop of the hammer exactly suited to his needs.

The invention consists in the features and combination and arrangement of parts hereinafter described and particularly pointed out in the claims.

In the accompanying drawings:

Figure l is a side elevation of a drop hammer embodying the invention.

Fig. 2 is a view looking from the left of Fig. l with the belts in section.

Fig. 3 is a detail of the sheath and drum associated therewith.

Fig. 4 is a sectional view of the sheath.

In these drawings 1 indicates a drop hammer, 2 a band or strap attached thereto for lifting it, 3 a drum over which the band passes and 4: the handle by which the-operator controls the operation of the hammer.

The drum 3 is fixed to the shaft 5 which is journaled in bearings 6 of the frame and carries a pulley 7 driven by a belt 8 by which arrangement the drum 3 is rotated constantly in one direction.

Associated with this drum 3 is a sheath or controller 9. This may assume different forms but in the particular form shown it consists of arms 10 loosely mounted on the shaft 5 at the sides of the drum 3 and carrying a: cross piece 11 provided with a channel or space 12 receiving the band 2. This sheath when in normal position, shown in Fig. l, rests with its stop pin 13 bearing upon the frame and in this position the band 2 is out of frictional contact with the rotating drum 3 as indicated at a; or bears so lightly thereon as to have no lifting effect upon the hammer. When, however, the handle a is pulled down the controller 9 will be swung leftward, by the pull of the band 2, from the normal position shown, with the result that the band will press upon the surface of the rotary drum and the band will then lift the hammer and continue doing so until the operator ceases to pull down or relieves the handle 4, whereupon the hammer will drop and the sheath will be swung.

to the right-into the normal p'ositiOn' shown 111 Fig. 1, being arrested in this position by the stop pin 13 coming against the frame Patented Jam 6, 19-20.,

and in this position thebarrd2 will be held substantially free from the surface ofthe revolving drum, which will nolonger have a lifting effect thereon. I p v It is obvious that the point "to which the hammer is lifted and consequently the length of its drop maybe determined a-t the will of the operator who needs only-to relieve 'the handle a of downward pressure to cause the hammer to drop and thus the or light as he may desire.

In order to positively establish slack the band 2 so that a material portion of said band will be brought in contact with the surface of the drum 3 before the lifting begins I provide a spring 14 "which will create slack at 15 so that when the handle at is pulled down the sheath will swing through a considerable angle before the band straighten's out and therefore a considerable portion of the band will be in frictional out departing from the principle in 'lved The stop pin holds the in my invention. controller beyond the vertical center of its pivot.

It will be understood that where herein I refer to operating the hammer by hand I do so in a generic sense to include other manual control such as by the foot.

In order toreturn the controller to its normal position with its stop pin 13 against the frame, I employ a spring 1.3 connected thereto and to a suitable fixed point.

I claim:

1. In combination a drop hammer, a revolving drum, a band passing over the drum connected to the hammer and having a portion to be pulled upon by the operator, and a member mounted to have movement in a direction circumferentially of the drum and engaging the band to normally free it from operative relation with the drum, said member when moved from normal position allowing the band to 'be operated by its frictional contact with the drum to raise the hammer, substantially as described.

operator can make the hammer blows heavy the top of the drum holding the band out of driving relation with the drum but moving circumferentially of the drum when the operator pulls upon the handle portion of the band to cause the band to frictionally engage with and be driven by the drum, substantially as described.

3.- In combination a drop hammer, a revolving drum, a band attached to the drop hammer and'passing over the drum, a controller member pivotally mounted and engaging the band to release or allow its frictional contact with the drum, according to whether said member is in normal position or is moved therefrom, said band having a handle ortion to be pulled upon by the operator or swinging said member from normal position and bringing the band in contact'with the drum to be driven thereby.

4. In combination a drop hammer, a revolving drum, a band attached to the hammer and passing over the drum, a controller member pivotally mounted and controlling the effective engagement of the band with the drum and a stop for limiting the movement of the controller, said band having a handle portion to be pulled by the operator for swinging the controller from its normal position and thereby permit the band to contact with and be driven by the drum, substantially as described.

5. In combination, a hammer, a revolving drum, a band passing from the hammer over the drum, a controller engaging the band, and pivotally mounted on the shaft of the drum, said band having a handle portion by which the band may be pulled to swing the controller and thereby allow the band to contact with and be lifted by the drum, substantially as described.

6. In combination, a hammer, a revolving drum, a band passing from the hammer over the drum, acontroller engaging the band, and pivotally mounted on the shaft of the drum, said band having a handle portion by which the band may be pulled to swing the controller and thereby allow the band to contact with and be lifted by the drum said controller comprising arms and a cross piece, substantially as described.

7. In combination, a hammer, a band, a drum over which the band passes, a controller for regulating the contact of the band;

with the drum, said bandv having a handle portion which, when pulled, sets the controller in position to cause contact of the band with the drum, and means for creating slack in the band, between the controller and the hammer, substantially as described.

8. In combination, a hammer, a band, a drum over which the band passes, a controller for regulating the contact of the band with the drum, said band having a handle portion which, when pulled, sets the controller in position to cause contact of the V band with the drum, and means for creating slack in the band, between the controller and the hammer, said means consisting of a spring connected to the band and the hammer, substantially as described.

In testimony whereof, I aflix my signature.

WILLIAM A. KNAPP.