US2653560A

US2653560A - Press safety jack

Info

Publication number: US2653560A
Application number: US223535A
Authority: US
Inventors: Bradhering Walter
Original assignee: Budd Co
Current assignee: ThyssenKrupp Budd Co
Priority date: 1951-04-28
Filing date: 1951-04-28
Publication date: 1953-09-29
Anticipated expiration: 1970-09-29

Description

Sept. 29, l 953 Filed April 28, 1951 FIGLi w. BRADHERING. 3,560

PRESS SAFETY JACK 2 Sheets-Sheet 1 (a o I 15 2133 BY Walter Bmdhering ATTORNEY Sept. 29, 1953 w. BRADHERING PRESS SAFETY JACK 2 Sheets-Sheet 2 Filed April 28, 1951 INVEWTOR. Walter Bmdhertng.

A T TORNE Y Patented Sept. 29, 1953 to The Budd. Company,-. Bhihdelphia, corporation of: Pennsylvania Application April 28, 1951, Serial No. 223,535

This invention relates to press safety jacks and has for an object the provision of improvements in this art.

Die presses for metal forming and punching operations oftenrequi're servicing while the mm or head is raised. Such servicing may consist in the changing of dies, re-shaping spots on the dies, removing material which lodges in the dies, and many other items well known in" die press operation.

The die ram or'head' of modern presses may attain great size and weight, a ram of the weight of many tons being common, and consequently if such a ram should drop accidentally it might do great damage, not only to personnel and items which happen to be located beneath the mm but also to" the press itself.

Press rams of large size-may be operated by hydraulic or mechanical drives. The hydraulic type drive may have a valve leak which would allow the ram to drop, and the mechanical drive may slipat the clutch or be released insome other way. In either, there is the danger that the controls may be actuated accidentally to cause the ram todescend.

For a long time'it hasbeen the practiceto place wooden timbers or studs under rams, the timbers being such as might be picked up readily around the shop. This practice has thedisadvantage that the timbers may not be suitable and'will break, or that they will not be properly placed and will fall out. And when a timber is not readily found there is a tendency to dispense with it altogether. It is seen, therefore, that the use of chance timber studs is neither consistent nor dependable.

Another practice has been to use screw jacks, either alone or on the end of a rigid stud of some type. Such screw jacks, being more valuable than random timber studs alone, will usually be kept in the plant, but they may not be readily available at a press and for this reason may not be used. They have the advantage over fixed:- Iength timbers that the screw device provides for holding the ram at different heights and. without free space which might allow the ram to start descending to gain momentum and inertia which might crush the studs or struts.

It is an object of the present invention to overcome these troubles and provide a jack or jacks which will always be present at the press and which is so associated with the press and its controls as to provide maximum safety in use.

To this end, the jack or jacks is mounted on movable supports on the press so as normally to be readily accessible but out of. the way; and further is associated with the power controls of the 8 Claims (01. 113-38 press: in. such a way that; the press cannot he accidentally operated when repairs are being;

made that is whenthe jack is; out? of its stored or-non-use positionor in its use: position.

The. objects: and: advantages ofthe invention maybe better understood from consideration of. an illustrative; embodiment, reference being made. to the accompanying? drawings; wherein:

Fig. 1 is aif-ront elevation. of a typical diepress. embodying; the inventi-on;,many of; the details of the: press beingomitted: for simplicity and because they are too common. and wellrknownto require illustration and description;

Fig. 2 is. a horizontal section and plan: view to show how twcr jacks may be-provided at the two control stations of. a large press, the view being taken: on thelinev 2.-2, of Fig. l; I

Fig. 3: is: a partial elevation at one control stashowing a jack in the stored or non-useposition, as compared; to Fig. l which: shows the same jack in the use position, and showingalsothe cont-rot buttons ofthe press; I

Fig: 4: is a further enlarged, partial elevation of the control zone with the jack in the use position in which itis; shown in; Fig. 1; I

Fig. 5 isa side elevation and section taken. on the liner 5-5 of Fig; 4;;

Fig. 6 is a. side elevation and. section taken on the line B-6 of Fig. 4; and

Fig. '7 is a horizontal section taken on the line 'I:--l of Fig. 4.

In the drawings the numeral It represents the press in general, the press having a ram or head l2 to be supported, a. base. 13. on which the jack is supported when in use, a power device It including, motor, clutch etc., and hand controls, [5. The: specific controls with which, this device has been used include the usual Run button 15R and Stop button 158 which control a magnetically operated clutch included in the power drive means 14.

A jack 20, comprising a strutv 20a and a screw jack 2% at each end, is mounted on a double hinged frame 2| carried on the end of the press. As, shown in F-ig. 2, there is a. jack mounted on each of two diagonal corners where the. two sets ofv hand controls are located. Since the. two jack installations are. alikeit will be necessary to describe Only one.

The frame 21 carries a shield or plate 22 which covers all controls 15R, [58, when the. jack is in the use position. It also carries an adjustable set screw 23 which engages and holds in the, stop button IBS. and a latch 24 which holds the frame securely in the use position.

The latch 24 may comprise a latch bar 25 pivoted at 26 to al bracketz'l secured to the press frame by set screws 28, the latch bar having a spring 29 holding it downward and a cam-nosed shoulder 30 adapted to ride over and retain a part on the frame when the frame is pushed into the use position.

The hinged frame 2! is herein shown to comprise a wide panel 2! a hinged to brackets 33 carried by the end post of the press frame, and a narrow panel 2Ib hinged to the first panel on a vertical axis 3 The wide panel carries the shield or plate 22, the set screw 23 and the latch keeper part, while the narrow panel carries the jack.

Not only does the jack or jacks support the ram [2 but it also supports the upper die 35 which itself may be very heavy. A lower die, which may be fixed or a part of a lower press action, is designated by the numeral 31.

The jack frame in the non-use position it swung around on the side of the press, as shown in dot-andalash l nes in Fig. 2. The outer leaf 2 lb carrying the jack may be folded back on the inner leaf. If friction in the joints and natu-- ral bias in mounting are not sufficient to hold the frame in this non-use position, there may be provided some means for hold ng it out of the way. However, the jack or jacks will always be accessible ready for use and there will be full as surance that the strut and iack are fully adapted in size and strength for supporting the rain of this particular press.

When it is desired to use the jacl: to support the ram the jack frame is swung around and the outer leaf carrying the jack still further swung around under the ram, as shown in full lines in Fig. 2. Here the shield covers the controls so they cannot be reached by hand, as shown in Fig. 2, and the adiustable set screw 23 holds in the stop button, the latch 24 holding the jack frame in this outer position.

When re airs or replacements have been made the latch 2 is released and the jack frame swung back out of the way.

While one embodiment of the invention has been described for purposes of illustration, it is to be understood that there may be various cmbodiments within the general scope of the invention.

What is claimed is:

1. A press safety jack installation comprising in combination with a press having a frame, a base, and reciprocatory ram, a jack frame hinged to one side of the press frame, a jack strut mounted on said jack frame, and a jack carried by said strut, the jack frame providing movement of the strut and jack from a. non-use position alongside the press frame to a position of the jack between the ram and base.

2. A press safety jack installation comprising in combination with a press having a frame, a a d reciprccatory ram, a double-leaf jack r nged by one leaf to the side of the press frame, a jacl: strut mounted on the other leaf of the jack frame, and jacks mounted on each end of the jack strut, the jack frame providing movement of the strut and jacks from a non-use position alongside the press frame to a position between the ram and base.

3. A, press safety jack installation comprising in combination with a press having a frame, a base, and a reciprocatory ram, a jack frame movably mounted on the press frame to shift from a non-use position to a position between ram and base, a jack carried by said jack frame, power controls on the press, and means on said jack frame cooperating with said controls for inhibit- 4 ing the operation of the press with the jack in position between ram and base.

4. A press safety jack installation comprising in combination with a press having a frame, a base, a reciprocatory ram, and ram power controls, a frame swingably mounted on the press frame to shift from a non-use position away from to a use position between said ram and base, a jack carried by said jack frame which in the use position is disposed between the ram and base, and means carried by said jack frame for rendering the controls inaccessible when the jack frame is in the use position.

5. A press safety jack installation comprising in combination with a press having frame, a base, a reciprocatory ram, and ram power controls including a run button and a stop button, a swingable jack frame carrying a movable from a non-use position to a use position in which the jack is disposed between the base and ram, a shield on said jack frame covering said control buttons when the jack is in the use position, a projection on the jack frame engaging the stop button for holding it down when the jack frame is in the use position, and a latch holding the frame in the use position.

6. A press safety jack installation comprising in combination with a press having a frame, a base, a reciprocatory ram, power means for operating the ram, and control means for the power means including a run control and a stop control, a double-leaf jack frame hinged to one side of the press frame, a jack strut and jack supported on the outer leaf of the jacs frame to be moved from a non-use position alongside the side of the press frame to a use position between the ram and base, a shield on said jacl; fraixe covering said controls when the jack. is in the use position, an adjustable projection carried by said jack frame for operating the stop control when the jack is in use position, and a latch for holding the jack frame in the use position.

7. A press safety jack installation comprising in combination with a press having a frame, a base, and mechanically reciprocatory ram, a jack frame movably mounted on the press frame to shift from a non-use position away from to a use position between base and a jack carried by said jack frame, power means including a motor and clutch for operating the ram, power control means on the press frame in the path of movement of the jack frame, and means on the jack frame for operating said control means at a position in its path of movement.

8. A press safety jack installation comprising in combination with a press having a frame, a base, and a mechanically reciprocatory ram, a jack frame movably mounted on the press frame to shift from a non-use position to a use position between base and ram, 2. jack carried by said jack frame, power means including motor and clutch for operating the ram, power control means on the press frame in the path of movement of the jack frame, and means for releasably holding said jack frame in the position for operating said control means.

WALTER BRADHERIN References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,198,767 Glasner Apr. 30, 1940 2,199,766 Victor May '7, 1940 2,249,630 Stacy May 6, 1941 2,483,955 Williams Oct. 4, 1949