US2354291A

US2354291A - Press

Info

Publication number: US2354291A
Authority: US
Inventors: Atwood H Grover
Original assignee: Individual
Current assignee: Individual
Priority date: 1942-10-19
Filing date: 1942-10-19
Publication date: 1944-07-25
Anticipated expiration: 1961-07-25

Description

July 25, 1944.

A. H. GROVER PRESS Filed oct. 19, 1942 2 Sheets-Sheet 1 July 25, 1944. A. H. GRovER PRESS 2 Sheets-Sheet 2 Filed Oct. 19, 1942 Patented July 25, 1944 UNITED STATES 2,354,291v PREss Atwood HIL-Grover, Rockaway,

i 'Application October 1d 1942,.;sefia1N0. 462,531 y (Granted undertlie act of ,March 3, 1883, as

amended April 30, 1928: 3710 0. G. 751) overhangingr head 3 which is .braced by two The invention described herein may be manu'- factured and used `by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

The present invention relates to presses particularly useful in the loading and processing of high explosive increments in ammunition parts. 4' A principal object of the present invention is to provide means to safeguard the operator of fpunch presses in loading and processing of high 'explosive parts used in ammunition and also to 'safeguard other personnel near or about said punch presses.

A furtherobject of this invention is to provide,

while accomplishing the above mentioned object, freedom of action for an operator in placing'a loading fixture into an indexed point., A still further object of the invention is to provide a barricade for a punch press which automatically comes into safeguarding position between the work and the operator or personnel y before the work is acted upon and removed from safeguarding position only after the work has .been operated upon.

Another object of the present invention is to provide a barricade for a subpress as a safeguarding means for personnel, which enables easy access to said subpress, which comes into safeguarding position before the work is operated on by said press, and which is `removed from said safeguarding position only after the work is operated upon.y In `this manner full protection is obtained.

i Other objects of the invention will be apparent from or particularly pointed out in the detailed description of an embodiment of the invention, which is hereinafter given.

Machines embodying the invention are especially useful for crimping and extracting detonators.

In the accompanying drawings which illustrate an embodiment of the invention, and in which the same reference numeral indicates the same part,

' Figure 1 is a side elevation partly` in section and a part broken away for purposes of clearer illustration.

' Figure 2 is a section on the line 2?-2 of .Figure 1 in which certain parts are shown in elevation.

Figure 3 is a section on the line 3 3 of Figure 1, looking in the direction of the arrows. V Figure 4 is a section on the line A- of Figure 1, looking in the direction of the arrows.

Referring to the drawings, the numeral I vindicates a press frame having a base 2 and an the said ram. The piston bracketsy 1 positioned in the angle between the overhanginghead and the plane front surface of the vertical portion 5 ofthe frame. The vertical portion 5 of the frame is provided, at its rear, with a bracing member 6 which is attached `at its base to base 2 ofthe frame.V i

On the upper surface of the overhanging head 3 is mounted anv air cylinder 1 having a piston and piston rod which'are reciprocated byA air under pressure. known articles of commerce and their" details of construction formr no part of this invention. In the present invention this cylinder'serves as a source of power for operating the vertically recipro'cating ram 'hereinafter referred *to more in detail. As will 'be understood,` this cylinder may be replaced-'by any suitable power means for rod of ythe cylinder 1 lis indicated by the numeral 8 in Figures 1 and 2. Screws 9 hold the' cylinder 1 in position. i

The ram Iof the press forms an extension of the Apiston rod 8 of the air cylinder 1. The lupper end `of the ram is threaded and screws Within the piston rod.r y 'The upper'end of the ram carries a `hex'vagon nut Il and ai lock washer I2, as shown'in Figures 1 and At the lower end ofthe ram I0 are positioned the collar I3 and the washerv lllgthe latter being advantageously of neoprene. The collar I3 is secured in the position shown by a set screw I5.

A circular head'IBL vhaving reliefopenings I1, is located on rain III vwith a sliding fit.v A circular flange I8 depends from this" circular head.

Secured to'ithis ilange by means of screws I9, and depending therefrom, is piece of'seamless steel tubing 233; -This' tubing alone or in connection witht thev circular head constitutes a barricade, the -action of which is'more fully explained hereinafter. At the lower end of the tubing 2B, and iitting around 4vand below the lower end of the same, is a rubber ring 2I. lThe rubber ring is secured to the tubing by means of rivets 22.- This rubber ring sealsthe''bottom of the barricade when in lowered position. 2 A coil spring 23, of the form illustrated, surrounds the ram l0 and is positioned between the head lr6 and the nutY II, the latter also acting as a stop'for the spring.

This springacts to resiliently hold the head I6 onv the washer III, which "in connection with the vcollar IE acts as a stop. v

Vertically below the ram I0, vthe press base 2 supportscircular die base plate 24 of steel. This plate is secured to base 2 by means of screws 25. Onthe base 2, andi secured thereto by means Cylinders of this type are well n 29, provided with two holes 39, ts on the posts;A

so that it may be adjusted to various levels. Set screws 3| are provided to hold the guide plate at a selected level. This guide plate `is provided with a bushing 32 Within which slides the shank or plunger of punch 33 or other metal working tool. The bushing and guide plate serve as a guide for the tool 33 that is used.A The shank of the tool ts in the bushing and extends above and below the guide plate and bushing. A collar 34 fits on the vshank'of the tool 33 below the guide plate 29 and anothercollar 35 fits on the shank above the guide plate. These collars are respectively held in position by set

screws

36 and 31. Aicoil spring 38,' of the form shown in the drawings, is placed on the shank of the tool 33 between the top of the guide plate 29 andthe collar 35. The tool 33 may therefore be depressed against the action of the spring 38, and when the depressing force is removed, the spring causes i, the tool torise again, the collar 34 limiting this upwardmotion; Plate 24 together with parts 28 to 38, inclusive constitute a type of subpress and are so referred to herein for purposes of general reference.

The tool 33 cooperates with a die 39 carried enbase o'r`shoe40 on plate 24. These may be a 'crimping and extracting punch* and base to suit job requirements.

A shield or guard4l extends. from the over'- hanging head 3 down to a point near the upper limit of travel of the barricade 2D. This guard consists of a rectangular sheet of steel bent in the form of a ,U, and which is attached` at its top to the rounded free end of the overhanging head 3. The longitudinaledges of the guard are attached, by means ofscrews 42, to the two edges of the verticalhportion of the press frame. Barricade with its head I6 move freely within the guard Below the base 2 ofthe Apress frame l is secured a drawer housing 43, advantageously made of heavy metal. This housing is attached to the under side of the base 2 of the press frame by means of two angle irons 44, welded to the sides of the housing,and screws `45 which pass through the angle irons and engage the base 2. The drawer housing has a sliding door 46 at its front, and this door is formed with a handle 41. A drawer 48 -with Aknob 49 is shown, in dotted lines in Figure l, inV the drawer housing 43. The drawer and its housing are so positioned as to permit the drawer to receive parts passing from the-die through the passageway 50.

The barricade is preferably of sufficient size to provide space therein for a fixture, for example a loadingl fixture, so that the barricade may freely pass over and rise above the fixture.

'I'he operation `of the machine is as follows. The ram l 0 descends and carries the barricade 20 downwardly with it until the rubber ring 2| at the bottom of the barricade comes into contact with and presses `against the ring 21 on the base 2 of the press frame. Owing to the sliding relationship between the ram I0 and the head I5 on the barricade, the ram l0 can continue its downward motion after the barricade 20 and ring 2| have seated on ring 21. During this further motion of the ram I0, the spring 23 is compressed and the bottom end of the ram comes into contact with the shank or plunger of the tool 33 in the subpress, whereby this tool is moved downwardly for operation on the vWork or metal .in cooperation with a die. During'this further motion of the ram I0, the collar I3 and washer 4 are carried downwardly away from the head 6 bythe ram. When the ram Il) starts to ascend, the barricade 20 remains seated or in its down position, and is held there under the influence of the compression in the spring 23 until the collar I3 and its washer I4, in the upward travel ofthe ram I0, meet the under surface of the head I6 and carry it and the barricade upwardly with the ram. The barricade is timed, or so positioned with relation to the other parts of the machine'that the barricade and its rubber ring 2| are seated on the ring 21 on the base 2, i. e., in safeguarding position between the operator. or personnel and the work, before the press or subpress begins to operate on the work or metal to bevoperated upon, and the barricade remains in the safeguarding position during the time the work is being operated upon and starts its ascent `or removal from the safeguarding position only after the work has been completely operated upon. In like manner, by proper timing or relative lpositioning of the parts, the barricade can be moved into the safeguarding position before the tool 33 enters a. fixture used within the barricade and held in this position all the time the tool is in the fixture, and only elevated or removed from the safeguarding position after the tool 33, in its upward motion, clears or is removed from the fixture. In this latter instance, therefore, the tool or punch 33 has left the fixture be fore the barricade starts its upward travel from the fully closed condition, the said closed condition having been produced before the punch entered the fixture.

Rubber ring 2|, besides sealing the bottom of the barricade when in lowered position, serves as.

.an additional safety feature, in that if the operator of the machine fails to withdraw his fingers at the proper time, it will absorb any and all compression force that may result when the barricade descends. l

I claim:4

l. In a press, a ram, a work-tool actuated by the ram, a vertically movable barricade adapted to completely envelop the work and work-tool in one position of the barricade and interposed between the work to be operated upon by the press and an operator thereof, and serving as a safeguard, connections between the barricade and the ram for lowering said4 barricade to work and work-tool enveloping position before the work is operated upon and for 'removing the barricade from such position after the work has been operated upon.

2. In a press, a ram, a work-tool actuated by said ram, a barricade serving as a safeguard between the work to be operated upon and the operator, saidbarrieade being carried by the ram and moving forwardly with the ram until it envelops the work and work-tool in safeguarding position, said barricade reaching its safeguarding position before the work is operated upon by the press, and means carried by the ram for remov- Aing the barricade from safeguarding position only after the work has been operated upon.

3. In a press, a vertically reci-procable ram, a work-tool actuated by said ram, a barricade carried by said ram andhaving a head and a portion extending downwardly therefrom constructed and arranged to envelop the work and the work-tool in one of the positions of the barricade, said ram and head being in sliding engagement and the lower part of said portion being above the work position when said ram is in rai-sed position, a stop on the ram below said head, another stop on the ram above the head, the stops being spaced apart to permit said ram to move with respect to said head, a spring between the head and the stop above the head, a work supporting base below the downwardly extending portion of the barricade and supporting the work-tool and engaged by the lower end of the downwardly extending portion in its lowermost position, to envelop the work and work-tool.

4. In combination with a press having a vertically reciprocable ram, a subpress operated by said ram, a barricade carried by said ram, for safeguarding personnel, operative connections between the press and the barricade for moving said barricale to subpress-enveloping and safeguarding position before said subpress operates upon the work and for removingfthe barricade from said position after the subpress has operated upon the work.

5. In a press, a ram, a work-tool actuated by said ram, a barricade serving as a safeguard between the work to be operated upon and the operator, said barricade being slidably carried on the ram and moving forwardly with the ram until it envelops the work and work-tool in safeguarding position, said barricade reaching its safeguarding position before the work is operated upon by the press, and means carried by the ram for removing the barricade from safeguarding position only after the work has been operated upon.

ATWOOD H. GROVER.