Патент USA US2113084код для вставки
April 5, 1938. J. F. HEWITT ET AL‘ 2,113,084 HAMME R Filed Nov. 23, 1937 4” rgggtk ‘ /4 // w ,4 I [_ ,-/5 l 20} 15v 6:11:55 LV____; [6 10 15 " 17 _ 372 31 [3 4 F 43 14 21 ' INVENTORS J. F. HEM/\TT BY J- H - HOERSTER ATTORNEY. Patented Apr. 5, 1938 2,113,084 UNITED STATES PATENT‘O‘FF‘ICE 2,113;084 ' HAMMER. John. F. Hewitt and John1H..:Hoerster,IPOrtland, .Oreg. ' Application‘ November 23, 1937, Serial No. 176,024 5 Claims. ‘This invention relates’ generally to tools, and particularly to a hammer. ' ’ , ’ ‘The main object of this invention is the con struction of a mechanically driven hammer whose 5 operation may be easily controlled in a manner that the blow struck thereby may range ‘from alight tap to a blow of considerable'force. The second object is to so construct the ham mer that its parts will be simple to manufac 10 ture and will not require extreme accuracy in. its production. ‘ (Cl. v125-33) ' vided with the spring urged plungers '23 which are adapted to engage the recess 20. On the end of the handle I2 is disposed an anti-friction bearing 24 in which journals the drive shaft 25. The shaft 25 has an enlarged end 26 which jour nals in the bronze bushing 21. In the enlarged portion of the drive shaft 25 is formed a cylin drical opening 28 adapted to receive the enlarged portion 29 of the eccentricshaft 30. The third object is the construction of a ham mer of the class described which will lend itself to use where compressed air is not available. The ‘fourth object is the construction of a drive ‘shaft 251s close to ‘the ?attened face l6 Fig. 5 is an end elevation of the eccentric shaft 30 and drive shaft ‘showing the parts in a driving thereby rotating the’ec‘centric shaft 130. Aithrust bearing 42 is placed against the end of the col i 145 v Theshaftj? ‘hasfformed on one end thereof 10 an. eccentric pin 3| which extends ‘into the slot 'llrvof the plunger'l5 while vthe end 32 of the of the plunger "[5. ' Slidably disposed on the ‘drive shaft‘ 25 is a 15 mechanical hammer which may be operated by c‘ollar'33 which is drivably‘connected to the shaft a rotating ?exible shaft. I25by'n'1eans of vthe spline'34. On the'drive shaft ‘These and ‘other objects are ‘accomplished in 25'is secured the'?anged collar 35 "by means of the manner set forth in the following speci?ca the set screws 36. A spring 31 is placed 'around tion as illustrated in the accompanying drawing, ‘the shaft'25 between the collars 35 and 33 for 20 in which: ' ‘the purpose of urging same apart. The drive Fig. 1 is a perspective view of ‘the device. shaft 25'is provided with a cut-away portion 38, Fig. 2 is a section taken along the line ‘2——2 which communicates with the cylindrical open in Fig. 1. ing 39 in which journals the eccentric shaft 30. Fig. 3 ‘is a section taken along the line 3-3 A tangent pin '40 extends through the collar 33 25 25 in Fig. 2. .and‘into vthe eccentric ‘shaft 30 which shaft has Fig. 4 is a section taken along the lineT4-4 in "formed therein a spiral groove 4| adapted to Fig; 2. permit the collar "33 to ‘move longitudinally and position. Fig. 6 is a view similar to Fig. 5 but showing the parts in a neutral position. Fig. '7 is a side elevation of the plunger. 35 Fig. 8 is a section taken along the line 8—8 in Fig. 2. Similar nmnerals refer to similar parts throughout the several Views. Referring in detail to the drawing, there is 40 shown the tubular head It] having a side out let ll upon which is mounted a tubular handle l2. Mounted in the ends of the head In are the bushings l3 on the outer side of which are placed the grease retainers l4. Extending 45 through the bushings l3 and grease retainers I4 is a cylindrical plunger [5 having formed on one side thereof a ?at area l6 through which is formed the slot I‘! which is inclined with re lation to the longitudinal axis of the plunger I5. 50 The opposite ends of the plunger l5 are pro vided with the chambers l8 and I 9, each of which is provided with a recess 20. In this case we have illustrated a single tool 2| having a work engaging head 22 which may The tool 2| is pro 55 be of any desired shape. lar'33. ' - A sleeve 43 is slidably mounted on the shaft 25. The sleeve 43 has formed on one end there of a ?ange 44 which engages the thrust bearing 42. The sleeve 43 is preferably non-rotatable and has its sides 45 ?attened to receive the arms 46 of a forked lever 41 which is pivoted on the pin 48 and is operated by means of a hand lever 49. The arms 46 engage the ?ange 44. The shaft 25 is provided with a tapped hole 50 to receive the end of the ?exible drive shaft 5| which maybe rotated by any convenient source of power. The operation of the device is as follows: When rotary motion is supplied to the shaft 25 by means of the ?exible drive shaft 5|, it causes the eccentric shaft 30 to revolve about the axis of the shaft 25 which coincides with the axis of the pin 3| when the device is in a neutral position, in which event the pin. 3| mere 50 ly rotates within the slot ll. However, when the lever 49 is moved toward the handle [2, the arms 46 move to compress the spring 31 by sliding the collar 33 along the shaft 25. This move ment causes the pin 40 to move along the groove 55 2 2,118,084 4i and rotate the eccentric shaft 30 on its axis causing the pin 3| to assume a position which is eccentric with relation to the shaft 25, and since the pin 3| is rotated with the shaft 25, the re sult is a reciprocating movement at the plung er l5. Obviously, the more the hand lever 49 is moved toward the handle l2, the greater will be the degree of eccentricity and the greater will be ll) the force of the blow struck by the hammer head 22. It must be understood that while the present drawing illustrates a desired form of this in vention, it is not intended that the claims shall 15 be limited to the precise form shown, it being intended to cover all forms and modi?cations of this invention which fall fairly within the ap pended claims. We claim: 1. A mechanically driven hammer having a slidable tool holding plunger. having a slot formed in the side thereof, a handle for supporting said plunger, a drive shaft mounted in said handle, an eccentric shaft eccentrically mounted in said 25 handle in a manner that a portion thereof may be moved to and from a concentric position, said portion occupying said slot and means for con trolling the degree of eccentricity of said slot oc cupying portion. 2. The device of the class described having in combination a head, a plunger slidably mounted in said head, a handle attached to said head, a drive shaft rotatably mounted in said handle, said drive shaft having an opening formed there 35 in parallel with its axis and spaced therefrom, an eccentric shaft having a portion thereof occupy ing said opening and having an eccentric portion projecting beyond the end of said drive shaft into said plunger, said plunger having a trans 40 verse slot formed therein adapted to receive said eccentric portion, a spring urged collar mounted on said drive shaft, a tangent pin mounted in said collar, said eccentric shaft having a spiral groove therein into which said pin projects and 45 means for moving said collar longitudinally along said drive shaft for the purpose of rotating said eccentric shaft and varying the degree of eccentricity of the end thereof. 3. In a device of the class described, the com 30 50 bination of a head having a handle on the side thereof and having a plunger slidably mounted therein normal to said handle, a drive shaft mounted in said handle having an eccentric shaft eccentrically mounted therein so that a portion of said eccentric shaft may be rotated to a concen tric position with relation to said drive shaft, said eccentric shaft having a spiral groove formed therein, a collar on said drive shaft having a tan gent pin therein adapted to engage said groove, a spring in said handle adapted to urge said col lar in a direction which will move a portion of said eccentric shaft to a concentric‘ position, an anti-friction bearing engaging said collar, a ?anged sleeve engaging said bearing, a forked lever engaging the flange of said sleeve, means for actuating said lever in a manner to compress 15 said spring and a plunger in said head having a slot formed therein adapted to receive said ec centric shaft end, said slot being characterized by being inclined with relation to the axis of said plunger. 4. In a hammer of the class described, a slid able tool holding plunger having a slot formed across one side thereof, said slot being inclined with relation to tile direction of movement of said plunger, an eccentric shaft having one por 25 tion thereof projecting into said slot and having the second portion thereof rotatably mounted within a drive shaft, said second portion being eccentric with relation to said drive shaft, means for varying the relation between the positions of 30 said drive shaft and eccentric shaft and means for rotating said drive shaft. 5. An eccentric-drive for mechanical hammers consisting of a drive shaft having an eccentric shaft eccentrically mounted therein, said eccen 35 tric shaft having projecting from the end thereof and in eccentric relation thereto a pin which may assume a position concentric with relation to said drive shaft or eccentric with relation thereto, to gether with a cylindrical plunger having a flat 40 tened side adjacent to said drive shaft, said plunger having a slot formed in said flattened side inclined with relation to its axis, said slot being adapted to receive said pin, said plunger being reciprocated by the rotation of said drive 45 shaft to a distance corresponding with twice the distance between the neutral position of said drive shaft and the eccentric position thereof. JOHN F. HEWITT. JOHN H. HOERSTER.