US1954159A - Drop hammer - Google Patents

Description

April 10, 1934. .1. c. WATTLEWORTH DROP HAMMER Filed Sept. 21. 1931 5 Sheets-Sheet l m v I Z2 cmmwm i g Q3 a6 W; 0 H MAJ/WIN 5% 6 W a 4 4 x t% 5 M g j 3 2 a Z y W W m1 4 r70 P 0, 1934. J. c. WATTLEWORTH 1,954,159

DROP HAMMER Filed Sept. 21, 1931 3 Sheets-Sheet 2 7 John. Q. 6 Wattlzwortk y INVENTOR April 10, 1934- J. c. WATTLEWORTH 1,954,159

DROP HAMMER Filed Sept. 21. 1931 3 Sheets-Sheet 3 V, 3 John; Q\Watt1worth INVENTOR 'ATTORNEDW' Patented Apr. 10, 1934 UNITED STATES PATENT; OFFICE DROP HAMMER a corporation of Ohio Application September 21, 1931, Serial No. 564,013

9 Claims.

This invention relates to drop hammers and has for an object the provision of a new and improved apparatus of this type.

In the drawings accompanying this specification and forming a part of this application I have shown, for purposes of illustration, one form which my invention may assume, and in these drawings:

Figure 1 is a front elevational view of an embodiment of the invention,

Figure 2 is a fragmentary rear elevational view of said embodiment,

Figure 3 is an enlarged horizontal sectional view corresponding to line 3--3 of Figure 1,

Figure 4 is an enlarged vertical sectional view corresponding to the line 4-4 of Figure 1,

Figure 5 is an enlarged horizontal sectional view corresponding substantially to the line 5--5 of Figure 1,

Figure 6 is an enlarged horizontal sectional view corresponding substantially to line 66 of Figure 1, while Figure 7 is an enlarged vertical sectional view corresponding substantially to line 7-7 of Figure 6.

The embodiment of the invention illustrated in the drawings comprises a base support 20 which may be sunk a suitable distance into the floor to provide a firm anchorage therefor, and the base 20 is provided with a platform 21 for the accommodation of a die support 22 carrying a die 23. Secured to theupper surface of the base support 20 and reaching upwardly therefrom to a connecting head 24 are spaced standards 25, each 33 of which is substantially T-shaped in cross section, with the stems 26 disposed inwardly and providing projections 27 receivable in guide grooves 28 formed in a hammer head 29. At its lower end the hammer head 29 carries a die supporting portion 30 provided with a groove for the reception of a die 31 adapted to cooperate with the die 23. At its upper end the hammer head 29 has attached thereto a plurality of boards 32,

each square or diamond-shaped in cross section to provide V-shaped contours along the ends of which are supported by means of antifriction bearings 37, eccentrically carried by cylindrical bearing members 38 forming a part of the connected housing members 40, and rotatably journaled in bearing supports 41, and the shaft 36 has a pulley 42 adapted to be driven by a suitable motor not shown; the roll 34 is fixedly secured to the shaft 43, supported in antifriction bearings 44, eccentrically carried in cylindrical bearing members 45 forming part of the connected housing members 46 and the bearing members 45 are rotatably journaled in supports 47 carried by the head 24, and the shaft 43 has a pulley 48 secured thereto adapted to be driven by a suitable motor.

One of the connected housing members 46 is provided with a pair of ears 49 for the reception of one end of a rod 50 pivotally held between the ears by a pin 51, and the rod 50 has its opposite end extended through a lug 52 mounted on one of the standards and is adjustably afiixed to said lug by adjusting nuts 53 flanking said lug, this construction permitting adjustment of the position of the roller 34.

The connected housing members 40 are also provided with spaced ears 54 between which extends one end of a lever 55, pivotally held between the cars 54, by a pin 56, and the lever 55 is inclined laterally and pivotally connected by a pin 57 to the upper end of an elongated gravity influenced member 58, reciprocably mounted adjacent its up per end in a guide bracket 59, and at its lower end in a socket 60 on one of the standards 25. The weight of the member 58 acting through the lever 55 rotates the bearing members 38, and by reason of the eccentric mounting of the shaft 36 in said bearings, the roll 33 is maintained in tight engagement with the tailpieces 32; upward movement of the weighted member 53, moves the lever 55, and the housing members 40, and bearings 38 in a clockwise direction which results in the roll 33 moving away from the tailpieces 32, thereby releasing the tailpieces 32 and permitting the hammer head 29 to drop.

Means are provided for lifting the weighted member 58 through movement of the hammer head 29, and such means comprise an arm 61 pivotally secured as at 62 to a plate 63, supported by headed bolts adjustably secured in a slot 64 formed in the standard 25, and the arm 61 is provided with a slot 65 accommodating a block 66 pivotally carried by a bracket 167 rigidly aifixed to the weighted member 58, and the outer end of the lever 61 is provided with a cam shoe 67 engageable with a cam 68 formed on the hammer head 29, the cams 6'7 and 68 being of such configuration that upward movement of the hammer brings about a relative slow swinging movement of the arm 61 at less speed than the speed of elevation of the hammer head, causing movement of the roll 33 away from the tailpiece 32 and releasing said tailpieces, this construction serving to efiect a gradual release, and thereby doing away with the shock which occurs in ordinary constructions when the rolls are actuated to release the hammer head. Below the cam 68 the hammer head 29 has a flat portion 168 with which the cam surface 67 of the lever 61 comes into contact when the hammer head 29 overthrows upon its upward stroke as usually occurs, thereby limiting upward movement of the arm 61 and consequently of the weighted member 58, so that the distance of elevation of the weighted member 58 can be exactly regulated regardless of upward overthrow of the hammer head 29.

Means are also provided for retarding the descent of the weighted member 58, thereby bringing about a cushioned or gradual engagement of the rolls 33 and 34 with the tailpieces 32. Such means comprises a reciprocating cam member 69, having a cam surface 70, adapted to be engaged by a roller '71, carried by a bracket 72 fixedly secured to the weighted member 58. The cam member 69 is slidably mounted in guide brackets '73 and '74, and at its outer end is connected by a cross head '75 with a reciprocating plunger 76, reciprocably mounted in bearings '77, forming part of the adjacent standard 25, and the outer end of the plunger '76 is adapted to be engaged by the rounded surface 177 of a bracket 78 carried by a swinging member '79, pivotally connected, as at 80, to the adjacent standard 25, and the swinging member 79 has its free end bail-shaped as shown at 81, operating in a bearing 82 carried by a rod 83, reciprocably mounted in bearings 84, and a spring 185 is interposed between the bearing 82 and the adjacent bearing 84, said spring normally urging the free end of the swingin member 79 inwardly, and the swinging member 79 carries a bracket 85, having a cam surface 86 adapted to be engaged by a surface 87 on the hammer head 29. Pivotally connected, as at 88, to the reciprocating cam member 69 is one arm of a bell crank lever 89 pivotally carried, as at 90, by the adjacent standard 25, having its other arm provided with furcations 91 which are disposed upon opposite sides of the member 58 and bear upon a collar 92 slidably mounted upon the weighted member 58, and yieldably supported by a spring 93 interposed between the collar 92 and the bracket 72.

Eccentrically mounted clamps 94 are carried by the head 24, one of said clamps being adjustably secured in position by an adjustable rod 95, in a manner well known in the art, while the other clamp 94 is movable through manipulation of the lever 96 and rod 97, these clamps when closed serving to engage the tailpieces 32 and arrest the hammer in elevated position.

In operation, the gravity influenced member 58, through its action upon the lever 55, holds the roll 33 in such position as to be in contact with the tailpieces 32 and also press such tailpieces into close engagement with the roll 34,

I and these rolls when rotated in opposite directions elevate the hammer head. As the hammer head approaches the limit of its upward movement the cam 68 thereof comes into engagement with the cam shoe 6'? of the arm 61, moving the arm 61 in a clockwise direction, and this movement through the sliding connection of the arm with the weighted member 58, elevates the member 58 a predetermined distance only as governed by the length of the cam surfaces 67 and 68, for as soon as the cam 67 comes into contact with the fiat portion 168, elevation of the weighted member 58 ceases, and the weighted member 58 is so disposed as to present the roller 71 in such position as to immediately engage the cam surface '70 without jar, when the weighted member 58 descends. This upward movement of the weighted member 58 through the lever transmits movement to the housing members 49 and bearing members 38, causing separation of the roll 33 with respect to the tailpieces 32 and roll 34, thereby permitting the hammer head 29 to drop, releasing the arm 61 and weighted member 58.

As the hammer head 29 descends and approaches the limit of its downward movement, the portion 8'7 of the hammer head strikes the cam 86 of the bracket member 85, swinging the member 79 in an outward direction, and against the influence of the spring 185, thus causing outward movement of the rounded surface of the bracket 78 and outward movement of the plunger 76, which through its connection by the cross head 75, with the cam member 69, begins to pull the cam member 69 outwardly. The weighted member 58 having been released by reason of the arm 61 moving out of engagement with the hammer head 29, the weighted member 58 drops, and movement of the cam member 89 is so timed that as its movement begins the roller '71 carried by the weighted member 58 rolls down the cam surface 70 as it is gradually being retracted, this action serving to retard the descent of the weighted member 58, and to effect a gradual reengagement of the roll 33 with the tailpieces 32.

By provision of the construction above described the engagement of the rolls with the tailpieces is gradually effected, doing away with the sudden reengagement which occurs in connection with hammers employing weighted members to maintain the rolls in engagement, thereby providing a cushioned or retarded descent for the weighted member 58, resulting in longer life of the tailpieces and smoother operation of the hammer without the shock and jar heretofore considered unavoidable. Shock is also eliminated upon the ascent of the hammer, since lifting of the weighted member 58 is accomplished through the inclined surfaces of the cams 6'7 and 68, causing gradual elevation of the weighted member at a speed less than the speed of the hammer head, and furthermore the weighted member 58 cannot be lifted beyond a predetermined position due to the provision of the fiat portion 168 on the hammer head 29, assuring smooth engagement between the roller 71 and the cam surface 70, even though the hammer head 29 overthrows some- 1 what on its upward stroke.

It will be understood by those skilled in the art that the embodiment herein described accomplishes at least the principal object of the invention; and it will be further understood that said gageable with said tailpiece, one of said rolls being eccentrically mounted and movable toward and from the other roll, and having a lever connected with said eccentric mounting for operating said movable roll; a front rod member connected to said lever and under the influence of gravity operable to cause engagement of said rolls; means engageable by said hammer during its movement for elevating and releasing said front rod member; cam means movable across the path of descent of said front rod member; and means, operable through engagement by said hammer, for positively moving said cam; said cam presenting a contour operable to retard the descent of said front rod member and effect gradual engagement of said rolls.

2. A drop hammer machine, comprising: a reciprocable hammer having a tailpiece; rolls engageable with said tailpiece, one of said rolls being eccentrically mounted and movable toward and from the other roll, and having a lever connected with said eccentric mounting for operating said movable roll; a front rod member connected to said lever and operable under the influence of gravity to cause engagement of said rolls; means engageable by said hammer during its movement for elevating and releasing said front rod member; cam means movable across the path of descent of said front rod member; mechanism comprising a lever pivoted at one end to said machine and having a cam member engageable by said hammer and operable upon such engagement to cause swinging movement of said lever about said pivot; and a connection between said lever and said cam means for positively moving said cam means; said cam means presenting a contour operable to retard the descent of said front rod member.

3. A drop hammer machine, comprising: a reciprocable hammer having a tailpiece; rolls engageable with said tailpiece, one of said rolls being eccentrically mounted and movable toward and from the other roll, and having a lever connected with said eccentric mounting for operating said movable roll; a front rod member connected to said lever and under the influence of gravity operable to cause engagement of said rolls; means engageable by said hammer during its movement for elevating and releasing said front rod member; means on said front rod member carrying a rotatably mounted roller; cam means moving across the path of descent of said front rod member; and means for positively moving said cam, said cam presenting a contour cooperable with said roller to retard the descent of said front rod member and effect gradual engagement of said rolls.

4. A drop hammer machine, comprising: a reciprocable hammer having a tailpiece; rolls engageable with said tailpiece, one of said rolls being eccentrically mounted and movable toward and from the other roll, and having a lever connected with said eccentric mounting for operating said movable roll; a front rod member connected to said lever and under the influence of gravity operable to cause engagement of said rolls; means engageable by said hammer during its movement for elevating and releasing said front rod member; cam means moving across the path of descent of said front rod member; means for positively moving said cam in one direction during descent of said front rod member; said cam presenting a contour operable to retard the descent of said front rod member and effect gradual engagement of said rolls; an operable connection between said cam and said front rod member for moving said cam in an opposite direction when said front rod member is elevated; and cushioning means interposed in said operable connection.

5. A drop hammer machine, comprising: a re ciprocable hammer having a tailpiece; rolls engageable with said tailpiece, one of said rolls being eccentrically mounted and movable toward and from the other roll, and having a lever connected with said eccentric mounting for operating said movable roll; a front rod member connected to said lever and operable under the influence of gravity to cause engagement of said rolls; means engageable by said hammer during its movement for elevating and releasing said front rod member; cam means movable across the path of descent of said front rod member; means for positively moving said cam means in one direction during descent of said front rod member; said cam means presenting a contour operable to retard the descent of said front rod member; and connecting means comprising a bell crank lever pivoted at its elbow, and having one arm in operative engagement with said front rod member, and the other arm connected to said cam means, for moving said cam means in the opposite direction upon elevation of said front rod member.

6. A drop hammer machine, comprising: a reciprocable hammer having a tailpiece; rolls engageable with said tailpiece, one of said rolls being eccentrically mounted and movable toward and from the other roll, and having a lever connected with said eccentric mounting for operating said movable roll; a front rod member connected to said lever and operable under the influence of gravity to cause engagement of said rolls; means engageable by said hammer during its movement for elevating and releasing said front rod member; cam means movable across the path of descent of said front rod member; mechanism comprising a lever pivoted at one end to said machine and having a cam member engageable by said hammer and operable upon such engagement to cause swinging movement of said lever about said pivot; a connection between said lever and said cam means for positively moving said cam means in one direction; said cam means presenting a contour operable to retard the descent of said front rod member when moved by said connection; and connecting means comprising a bell crank lever pivoted at its elbow, and having one arm in operative engagement with said front rod member and the other arm connected to said cam means, for moving said cam means in the opposite direction upon elevation of said front rod member.

'7. A drop hammer machine, comprising: a reciprocable hammer having a tailpiece; rolls engageable with said tailpiece, one of said rolls being eccentrically mounted and movable toward and from the other roll, and having a lever connected with said eccentric mounting for operating said movable roll; a front rod member connected to said lever and operable under the influence of gravity to cause engagement of said rolls; means engageable by said hammer during its movement for elevating and releasing said front rod member; cam means movable across the path of descent of said front rod member;

mechanism comprising a lever pivoted at one end said cam means in one direction to retard descent of said. front rod member; and connecting means comprising a bell crank lever pivoted at its elbow, and having one arm in operative engagement with said front rod member, and the other arm connected to said cam means, for moving said cam means in the opposite direction upon elevation of said front rod member.

8. A drop hammer machine, comprising: a'reciprocable hammer having a tailpiece; rolls engageable with said tailpiece, one of said rolls being eccentrically mounted and movable toward and from the other roll, and having a lever connected with said eccentric mounting foroperating said movable roll; a front rod member connected to said lever and operable under the influence of gravity to cause engagement of said rolls; a lever pivotally mounted on said machine, movably connected with said front rod member intermediate its ends, and having a cam surface engageable with a cam surface on said hammer, said cam surfaces being proportioned to effect elevation of said front rod member the same distance upon each movement thereof; cam means movable across the path of descent of said front rod member; means for positively moving said cam means; said cam means presenting a contour 'ber,

proportioned to the cam surfaces of said lever and said hammer and to the distance of movement of said front rod member, and operable to retard the descent of said front rod member.

9. A drop hammer machine, comprising: a reciprocable hammer having a tailpiece; rolls engageable with said tailpiece, one of said rolls beu ing eccentrically mounted and movable toward and from the other roll, and having a lever connected With said eccentric mounting for operating said movable roll; a front rod member connected to said lever and under the influence of gravity operable to cause engagement of said rolls; means engageable by said hammer during its movement for elevating and releasing said front rod member; cam means moving across the pathof descent of said front rod member; means for'positively moving said cam in one direction duringdescent of said front rod member; said cam'presenting a contour operable to retard the descent of said front rod member and eifect gradual engagement of said rolls; and an operable connection between said cam and said front rod member for moving said cam in an opposite direction'upon elevation of said front rod mema i i 1%; JOHN C. WATTLEWORTH.

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