US1450849A - Hammer - Google Patents

Description

Apr. 3, 1923. 11,450,849

(3. GREEN HAMMER Filed June 6, 1921 2 sheets-sheet l WITNESS:

ATTO RN EY Apr. 3, 1923.

C. GREEN HAMMER Filed June 6, 1921 o o [M O o /a ,fio'

Maw w 2 sheets-sheet 2 INVENTOR ATTORNEY Patented Apr. 3, 1923.

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CHARLES GREEN, OF MUSCATINE, IOWA, ASSIG-NOR OF ONE-FOURTH TO EVER'I F. RIGHMAN AND ONE-FOURTH TO CHARLES J'. RICHMAN, BOTH OF MUSCATINE,

IOWA.

HAMMER.

Application filed June 6, 1921. Serial No. 475,523.

To all whom it may concern Be it known that 1, CHARLES GREEN, a citizen of the United States, residing at Muscatine, in the county of Muscatine and State of Iowa, have invented new and useful Improvements in Hammers, of which the following is a specification.

This invention relates to power hammers and has for its object the provision of a novel and efficient power hammer which is provided with means controllable by the operator whereby the length of stroke and consequently the power of the blow may be regulated to suit different conditions at the will of the operator even while the device is in full operation.

An important object is the provision of a device of this character which is also provided with means readily operable by the user whereby the device may be thrown into and out of operation in a very simple and efficient manner. 1

Another object is the provision of a device of this character which is provided with cushioning means whereby the shock of the operation of the lever carrying the hammer may be effectively cushioned or absorbed.

A further object is the provision of a device of this character which is so constructed as to involve the use of merely a small number of parts, the fewness of the parts together with their peculiar construction renderingthe device readily repairable in the case of derangement.

An additional object is the provision of a device of this character which will be simple and inexpensive in manufacture, highly efficient in use, durable in service and a general improvement in the art.

With the above and other objects and advantages in view, the invention consists in the details of construction to be hereinafter more fully described and claimed, and illustrated in the accompanying drawings in which, i

Figure 1 is a side elevation of the device.

Figure 2 is a front elevation.

Figure 3 is a plan view of the hammer end of the operating lever.

Figure 4 is a horizontal sectional view taken on a plane considerably below the operating lever.

Figure 5 is a vertical cross-sectional view taken through the pivotal connection of the lever with its support.

Figure 6 is a vertical sectional view taken through the drive shaft, and

Figure 7 is a detail horizontal section through the operating rod taken immediately above the rocking lever.

Referring more particularly to the drawings I have shown my device as comprising a suitable base 10 from one end of which rises a vertical upright 11 and from the intermediate portion of which rises an upright 12. Secured upon the upper end of the upright 11 is an anvil member 13 and also secured upon the rear base of the upright 11 is a vertically extending guide 14: formed at its intermediate portion with an elongated slot 15 and having secured to its upper end portion a pair of forwardly extending space guide yokes 16. Slidable through these yokes 16 is a vertically movable bar 17 carrying a hammer head 18 disposed above and cooperating with the anvil 13.

Secured upon the upper end of the upright support 12 is a bearing member 19 which is pivotally connected as shown at 20 with a bearing member 21 secured to the intermediate portion of an operating lever 22. The forward end of this lever 22 is bifurcated for straddling engagement upon the bar 17 and is formed with slots 23 through which passes a pin 24 extending transversely through the bar 17 whereby' to constitute an operative connection between this operating lever and the hammer bar. The rear end of the lever 22 is bifurcated as shown and is formed with slots 25 for a purpose to be described.

It is not an essential feature of the invention but it is well to mention in passing that I prefer to employ braces 26 connected. with the upper end of the upright 12 and with the upper end of the guide 14. I also provide braces 27 connected with the lower portion of the guide 14 and with the lower one of the yoke 16 whereby to provide strength. In actual practice it may likewise be found advisable to provide braces 28 connected with the lower portion of the upright 11 and with the upper portion of the upright 12 whereby to hold these members relatively rigid.

Secured upon the base 10 rearwardly of posed upon the anvil.

the springs39 and 4:1 cushion the shock and the upright 12 are bearings 29 through which is journaled a shaft 30 provided at one end with a balance wheel 31 and pro vided at its other end with a pulley 32 about which is trained a belt 33 driven by any suitable power device, not shown.

Secured upon the intermediate portion of the shaft 30 is an eccentric 34 encircled by an eccentric strap 35 which is connected with the lower end of avertically rcciprocatory rod 36 which is slidable through a block 37 disposed within the bifurcation at the rearend of the lever 22. This block 37 carries oppositely extending trunnions 38 which pass through the slot 25 as shown. Dis posed upon the rod 36 is a coil spring 39 which has its lower end abutting against the block 37 and which has itsupper end abutting against a nut 40 threaded onto the upper extremity of the rod 36; Also encircling the rod 36 is a coil spring 11 which has its upper end abutting against the under side of the block 37 and which has its lower end abutting against a stop-collar 42 secured upon the rod 36. By this construction it will be seen that when the shaft 30 is rotated the rod 36 will be reciprocated' vertically and this will result in swinging the lever 32 to bring the hammer member 18 carried thereby into engagement with the anvil13 or'into engagement with'work dis- It is to be noted that avoid breaking the parts when the machine is in operation. that by adjusting the nut 40 the degree of tension of thesprings may beregulated to meet varying conditions.

In order that the machine may be readily controlled, that is thrown into or out of gear as may bedesired, I provide a yoke 43 pivoted'upon thebase 10 at the rear of the shaft 30 and carrying a. roller 4L4 which engages against the rear side of the rear stretch of thelo'elt 33. Pivoted upon the forward portion of thebase 10 is a treadle member 15 which'is angular in shape and which has the fr'ee'end of its rearmost arms connected'witli the upper portion'of the yoke 43 by means of suitable links 46. It will be seen that when theoperator presses upon the t-readlc 45 and ellie'cts rocking of the treadle the links 46 will pull upon the yoke 43 and move the roller 44 into closeengagcment with the rear stretch of the belt so that the belt will grip the pulley 32 with a sufficient degree of friction to insure rotation of the shaft 30 for driy'ing the machine.

In order that tl'le'degree of movement of the lever 22 may be regulated, I provide a link 47 slidable along one side of the rear endofthe lever 22 and pivotally connected witlrtheprojecting end of one oi the trunnions 38. Secured upon the rear side oi. the upright 12 is a supporting bracket 48 It is also to be observed upon which is pivoted a lever 49 which has its upper end pivotally and slidably con nected with the forward end. of the link 47 and which has its lower end pivotally connected with alink 50 which is in turn pivotally connected with a lever 51 having a grip actuated pawl mechanism 52 cooperating with a notch segment 53 secured at the forward end of the base 10.

In the operation of the device it will be seen that when the operator presses upon the treadle 45 the yoke l3 will be moved forwardly to bring the roller n thereof against the rear stretch of the belt 33 so that the shaft 30 will be operated. I -Then this shaft 30 rotates, the eccentric 34 carried thereby will effect vertical reciprocatory movement of the rod 36 and this will of course cause the rocking movement of the lever 22 so that the hammer member 18 thereof will co operate with the anvil for producing a hanr mering action upon any Work disposed upon the anvil. As stated above the provision of the springs 39 and 41 is important as it pro vides the proper cushioning effects so as to take up the shock or jar and to permit a certain amount of lost motion at the rear of the lever to avoid breaking any of the parts, Whenever it is desired to vary the degree of. movement of" the hammer member or the lev er 22 which carries the hammer member, it is merely necessary that the operator move the lever 51 so that the pawl 52 thereof will be engaged within the desired one of the notches This movement of the lever 51- results inmovement of the link 50; lever 49 and link 47 and this will of course change the position of the block 37 within-the bifurcation at the rear end of the lever so that the leverage exerted upon the lever will be varied; It is of course apparent that the de gree of movement of the block 37 with re spect to the lever 22 is controlled entirely by the lengthof the slots 25 in the lever.

From the foregoing description and a study of the drawings it'will be apparent that I have thus provided a simply constructed and consequently inexpensive machine which will be very efiicient and powerful in action as a power hammer; which is provided with novel and effectual cushioning means, which includes means whereby the device may be thrown into or out of gear at an instantsn'otice, and which is moreover provided with a'very simple devicewhereby the degree of movement of the hammer member may be varied to meet difierentIconditions.

While I have shown and described the preferredembodiment of the invention, it is of course to be understood thatI reserve the right to make such changes in the form, construction and arrangement of parts as will not depart from the spirit of the invention or the scope of the: subj oined'claims.

iii)

Having thus described my invention I claim:

1. A device of the character described comprising a base, a pair of uprights rising therefrom, an anvil member on one of said uprights, a lever pivoted upon the other upright and having its forward end provided with a hammer cooperating with said anvil, the rear end of said lever being bifurcated and formed with longitudinal slots, a shaft journaled upon said base, means for rotating said shaft, a cam on said shaft, an eccentric strap encircling said cam, a rod connected with said strap, a block engaged upon said rod and having trunnions disposed through said slots, and means for moving saidtrunnions along said slots whereby to vary the leverage upon said lever.

2. A device of the character described comprising a-base, a pair of uprights rising therefrom an anvil. member on one of said uprights, a lever pivoted upon the other upright and having its forward end provided with a hammer cooperating with said anvil, the rear end of said lever being bifurcated and formed with longitudinal slots, a shaft journaled upon said base, means for rotating said shaft, a cam onsaid shaft, an eccentric strap encircling said cam, a rod connected with said strap, a block engaged upon said rod and having trunnions disposed through said slots and means for moving said trunnions along said slots whereby to vary the leverage upon said lever, astop-collar on said rod below said lever, a nut threaded upon the upper end of said rod, and springs encircling said rod and engaging against said stop collar and the block and against said nut and the block respectively.

3. A device of this character described comprising a base, a pair of uprights rising therefrom, an anvil member on one of said uprights, a lever pivoted upon the other upright and having its forward end provided with a hammer cooperating with said anvil, the rear of said lever being bifurcated and formed with longitudinal slots, a shaft journaled upon said base, meams for rotating said shaft, a cam on said shaft, an eccentric strap encircling said cam a rod connected with said strap, a block engaged upon said rod and having trunnions disposed through said slots, and means for moving said trunnions along said slots whereby to vary the leverage upon said lever, said means comprising a lever pivoted upon the base, a second lever pivoted .upon said second named upright and connected with said second named lever, and a link connected with the upper end of said last named lever and with one of said trunnions.

In testimony whereof I affix my signature.

CHARLES GREEN.

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