US891436A

US891436A - Power-press.

Info

Publication number: US891436A
Application number: US40410307A
Authority: US
Inventors: Victor K V Palmer
Original assignee: Individual
Current assignee: Individual
Priority date: 1907-11-27
Filing date: 1907-11-27
Publication date: 1908-06-23
Anticipated expiration: 1925-06-23

Description

A8 .436. PATENTED JUNE 23 1908'. 91 v. K. v. PALMER. v

POWER PRESS.

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. PATENTED JUNE 23 1908. v. K. V. PALMER.

POWBRPRBSS. APP'LIOATVION FILED nov.'27, 1907.

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' VICTOR K. V. PALMER, OF BROOKLYN, NEWYORK.

POWER-PRESS.

Specification of Letters Patent.

' Patented June 23, 1908.

Application filed November 27, 1907'. Serial No. 404,103.

To all whom it may concern:

Be it known that I, VIcToR K. V. PALMER,

a citizen of the United States, and residing at Brooklyn, in the county of Kingsand State of New York, have invented certain new and useful Improvements in Power Presses, of which the following is a specification, such as will enable those skilled in the art to which it appertains to make and use the same.

This invention relates to power presses of the class used for cutting, stamping or drawing sheet metal; and the object thereof is to provide clutch devices for locking the crank shaft, while the machine is in o eration, against rotation independent of t e drive wheel in both directions; a further object being to provide a press of the class specified with a double acting clutch mechanism for preventing the independent rotation of the power wheel on the crank shaft in both directions while the press is in o eration, and in this manner also prevent the jolt, jar and noise occasioned by the operation of presses of this class and prevent the racing of the crank shaft and accidental injury to operators; and with these and other objects in view the invention consists in the construction, combination and arrangement of parts, in connection with a power press hereinafter described and claimed.

The invention is fully disclosed in the following specification, of which the accompanying drawings form a part, in which the separate parts of my improvement are designated by suitable reference characters in each of the views, and in which v Figure 1 is a front view of a power press of well known construction provlded with my improvement, part of the construction being in section, Fig. 2 a section on the line 2, 2 of Fig. 3, Fig. 2 a view similar to Fig. 2 but showing the parts thereof in a different position, Fig. 3 a section on the

line

3, 3 of Flg. 4, Fig. 4 a section on the line 4, 4 of Fi 1.

In the drawing forming part of tiis specification reference being made to Fig. 1, I have shown a well known form of power press involving a base table a supported by legs a and on which is secured the bolster I) through which passes the spring buffer stud d which carries the spring buffer (1 which in this case consists of a rubber barrel or drumshaped device. Above the spring buffer d? and resting thereon is the metal washer d with which is connected the blank holding.

ring 62 this connection being made by means of pins (1.

The spring bufier stud is provided at its upper end with the usual draw die or punch a, and the bolster b is provided with a screw threaded collar in which the blank holding ring d is movable and to which is secured the collar 6 which limits the upward movement of the blank holding ring (i all these parts being of the usual construction. The press is also provided with the usual crank shaft f having the crank with which is connected the vertical movable lunger f which carries the punch f and sai crank shaft is provided with the usual drive wheel f all these parts being of the usual, construction.

It is customary, or has'been heretofore, to provide the crank shaft where it passes through the hub of the drive wheel with a groove g as shown in Fig. 2, and the hub of the drive wheel with a corresponding groove g and place therein a key clutch g whichis seglmental in cross section and provided with cy 'ndrical heads, and this clutch key is provided at it inner end with a segmental arm 9 between which and the shaft is placed an eX- pansion spiral spring g one end of which enters a socket formed in said shaft.

Secured to the side of the frame of the press adjacent to the power wheel is a bracket h to which is pivoted a bell crank k with which,is

connected a rod 70 which passes downwardly through a keeper h, and a spring h mounted on said rod over said keeper and serves to force the. said rod upwardly. The rod h is carried downwardly to the bottom of the frame of the press and connected with a treadle h, all of these parts being also of the usual construction and operation, and in the operation of this press the arm 9 of the clutch key 9 operates 1n connection-with the bell crank 7L2 to release the clutch and permit the drive wheel to rotate independent of the crank shaft, or to permit the crank shaft to turn independent of the drive wheel.

In the practice of my invention I employ another clutch key i the same in all respects as the clutch key 9 and provided with cylindrical end portions, and mounted in corresponding recesses in the crank shaft and in the hub of the drive wheel, and this clutch key t is provided at its inner end with a segmental arm t which projects in the same direction as the arm 9 of the clutch key g and connected with the arm a? and the crank shaft is a pull spring 01 and the arm '5 is provided with a cam face i which operates in connection with a tripper j secured to the frame work of the press and provided with a nose at 7' which engages the cam surface 1' on the arm 71 and pulls said arm out into the dotted position shown in Fig. 4, and rocks the clutch i in a direction opposite to that in which the .clutch g is rocked when said clutches are designed to disengage the hub of the drive wheel.

It will be observed that in Fig. 2 both the clutches or clutch keys are shown in operative position, in which the drive wheel is locked to the crank shaft, but in Fig. 3 they are both shown in inoperative position, in which the drive wheel is independent of the crank shaft. The hub of the drive wheelis also provided, as shown in Figs. 2 and 2 with a supplemental recess 0, or in other words said hub is provided with three similar recesses, and the keys 9 and t may operate in either of said recesses.

In the operation of this apparatus, the clutch keys '6 and g are both held in operative position as shown in Fig. 2 by the springs 9 and i When the machine is in operation the operators foot is bearing on the treadle 7t and the crank lever h is thrown inwardly so that the arm 9 of the clutch key 9 will not strike it. When the operator desires to stop the press he moves his foot from the treadle h and the crank If is thrown back into the position shown in Fig. 1, and the arm g of the clutch key g will strike said bell crank and throw the clutch key 9 into the inoperative position as shown in Fig. 2 and at the same time the arm 77 of the clutch key 'i is engaged by the tripper j and the clutch key 71 is turned in a direction opposite that of the clutch key g and the drive wheel is unlocked from the crank shaft as shown in Fig. 2 In this construction I also provide the crank shaft f, inside of the drive wheel f, with a collar is and outside of said wheel with a cap said parts being designed to hold the drive wheel in proper position, and the cap k also serving to conceal the end of said shaft and the ends of the clutch keys and to hold said clutch keys in proper position longitudinally of the shaft.

While operating a combination die which will draw a shell of considerable depth, as for instance, three-quarters of an inch or more, a powerful rubber buffer similar to that shown at d or a powerful spring buffer, forces the washer a5 upwardly with great force and this washer strikes the bolster b with corresponding force at the upward motion of the crank, and this force is also imparted to the ring (1 by the rod d which is forced upwardly in a similar manner, and this movement of said parts forces the plunger f upwardly and imparts a quick movement to the crank shaft f and causes said shaft to race in the drive wheel f. The constant repetition of this operation by reason of the washer d striking the bottom of the bolster 12 produces a violent and oftrepeated hammering similar to that given by the use of a sledge or other heavy hammer, and when a number of these presses are employed the result is very annoying and obj ectionable. This continuous pounding also results in throwing the die out of its true adjustment and the punch will begin to shear or shave off on one side and will rapidly become impaired; but by means of my improvement which consists in providing the supplemental clutch key, I prevent the racing of the crank shaft in the drive wheel and prevent the washer d from striking the bottom of the bolster a violent blow and thus avoid the hammering result referred to and also avoid the throwing out of operative position of the separate parts of the apparatus including the die and plunger and secure a uniform rotation of the crank shaft and a constant and steady operation of the press without danger of injury thereto and also without danger of injury to the operator.

It will be seen that both of the keys extend through the entire length of the hub, and both of said keys may be conveniently reached and manipulated, and this is one of the important, features of my construction.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent, is

1. A power press of the class described, provided with a crank shaft and a drive wheel mounted thereon, the hub of the drive wheel being provided in its inner face with a plurality of longitudinal recesses which are segmental in cross section, the crank shaft being also provided where it passes through the hub of the drive wheel with two similar recesses which are longer than the hub of the drive wheel, and two clutch keys mounted in said recesses, and longer than the hub of the drive wheel, the end portions of said clutch keys being cylindrical in cross section, and that part thereof within the hub of the drive wheel being segmental in cross section, one of said keys being operated in the usual manner to secure said wheel to the shaft in the operation of the machine when the shaft is turned in one direction, and the other key being automatically operated for locking said wheel to said shaft and )revent the rotation of the shaft in said whedl in the opposite direction.

2. A power press of the class described, provided with a crank shaft and a drive wheel mounted thereon, the hub of the drive wheel being provided in its inner face with a plurality of longitudinal recesses which are segmental in cross section, the crank shaft being also provided where it passes through the hub of the drive wheel with two similar which extend in the same recesses which are longer than the hub turning in one direction, and automatically of the drive wheel, two clutch keys mounted I operatlng devices for securin said wheel to in said recesses and longer than the hub of said shaft when the said sha't is turning in 15 the drive wheel, the inner ends of said clutch the opposite direction. keys being provided with se mental arms In testimony that I claim the foregoing as irection, the my invention I have signed my name in arm of one of said keys being connected with presence of the subscribing witnesses this the shaft by an expansion spring, and the I 23rd day'of November, 1907.

arm of the other by a pull spring, and pedal VICTOR K. V. PALMER.

operated devices for operating one of said Witnesses: keys to secure said wheel to the shaft in the C. E. MULREANY, operation of the machine when the shaft is M. E. DooDY.