US1234723A - Safety-guard for presses. - Google Patents

Description

C. M. BRANDT.

lSAFETY GUARD FOR PRESSES.

APPLICATION FILED Dec. I. I9I5.

I 1,234,723.. v.Patented July 31, 1917.

I III CHARLES, M. BnAfNn'r, or rnILADnLrHIA, PENNSYLVANIA.

SAFETYLG-UARD FOR PRESSES.

Specification of Letters Patent. A Patentedy July 31, 1917*;

Application filed December 1, 19.15- Serial No. 64,500.

To all whom it may. concern:

Be it known that I, CHARLES M. BRANDT, a citizen ofl the United States, residing at .Philadelphia in the county of Philadelphia and State ofV Pennsylvania, have invented new andnsefulV Improvements in VSafety-Guards for Presses, of which the following isr a speciication.y ,Y

The invention relates to presses and has for an object to provide a guard for preventing injury to the operator of the press. A still further object` of the invention is the provision of a device,which aside from racting asa guard or safety 'apparatusfOr the operator of a printing press also prevents the stacked printed matter on the table from falling into the press in cases where the. jarring of the table causes the stacked matter tok fall, or when the printed matterslips out of the hand `of the operatorwhile being removedv from the platen.

The invention is particularly adapted to,

printing presses and the like and primarily e to the bedand platen, typev of press, to the end that the hand of the operator will be prevented from becoming wedged or mashed between the chase` and platen, upon movement of the latter into closed or printing position. v

It is well known that a large number of injuries occur annually, due to the failure of the operator ofv a press such` as men-Y tioned, to remove his or her hand from the platen after placing theblank matter to be printed, thereon, and in which instance the hand, projecting acrossy the. face ofV the platen, is wedged and mashed between the platen and chase as the lattei movestoward the chase or vice versa. InjuriesH of this character occur mostly on printing` presses havingy a slow opening and quick closing movement or when both the chase and platen are moved toward eachv other.

vW'ith the avoidance of these injuries in view, I provide a simple, inexpensive guard, operating in conjunction with the press to remove the hand of the operator :from the platen of the pressand out of the way of' the danger zone mentioned, when the platen is moving toward` printing position.

In the further disclosure of the invention reference is to be had to the accompanying drawings, constituting .a part of this specification, in which similar characters of reference denote corresponding parts in allthe views, and in whichz Figure l is a fragmentary side elevation of a press, showing my device applied thereto and in guarding position, s A

n Fig.l 2 is another fragmentary side elevation showing the press with the device in inoperative or normal position, the platen beingin open position relative to the; bed', .of the press,

Fig. 8 isa and cam,

Fig,A 4c isa perspective view of the guard; proper, with the curtainY broken. away.`

lgig. 5 is a perspective view of the guide,y an

Fig. 6` is a vertical transverse' section perspective lview ofthe bracket taken through one of the extensions ofthe U-shaped element, showing the appl-icaton of a roller thereto.` v

Referring more lparticularly to the views I disclose a printing pressrlO, of; thebed and platen type, the essential parts as shownl being the frame 11i, Swinging platen 12;, taf ble 13 and bed 14 withthe usual chase 15 carried in the bed.

Secured to the back of the platen 12 on` each' side is a guidek bracket 16preferably consisting of spaced plates 17 andr guides 18,

the guides. being fitted snuglyV against thev back of the platen as will be'clearly seen. Set screws 2O passing through one ofthe plates 17 engage a face of a flange 2 1'onv the platen, with the othery plate 17 abut-ting against the underside ofA the flange, thusYY rigidly holding the guideV bracket against movement.v

A substantially inverted vLlv shaped elei ment 22, constitutes the guard proper and as shown 1s preferably formed -of arsingle piece ofV metal,y bent in the shape mentioned, and formed with laterall extensions 23 having rollers 24 journaled thereon. The element 22 is arranged to slide in thek guides 18, being thus` arranged and-movably supported in the rear of the platen.

Secured to each side of ,the frame 11 of the press is a bracket 25, preferably formed to provide a forwardlyprojecting cam 26 and a rearwardly projecting arm 27. terminating in a tubular bearing 28. Referring carel fully tothe views it will be extensions 23 of the element 22 pass through the'irregular openings 29. of the cams thus seen that the causing the rollers 24 to cooperate with the cams.` An apron 30 has a loop 31 at each end with a rod 32 passing through one loop with its ends seated in the bearings 28 of the brackets 25, the straight portion 33 of the element 22 being passed through the other loop of the apron.

Attentioncis particularly directed to the cams 26 of the brackets, and referring to Fig. 2 it will be seen thatl when the platen is in open position to receive matter to be printed, the straight portion 33 of the element 22 will lie substantially flush with the upper edge of the platen. Now as the platen swings forwardly and downwardly to bring the matter to be printed, toward the form,

V' the hand of the operator, used to place the matter on the platen would become wedged between the platen and the form if not withdrawn. Therefore as the platen moves into the position last mentioned it will be seen that at a certain moment, and due to the novel construction of the cams, the element 22 will be raised on the platen so that its straight portion, coming up beyondy the edge of the platen, will bear against the hand of Y the operator and force it from the dangerous position, between the platen and form. With this construction it will therefore be seen that each time the platen moves into position for printing the movement of the element 22 will serve as a warning to the operator and the element striking the hand of the operator will throw it or the fingers out from between the platen and form. As the platen returns to open position the element har-v ing the extensions 23 and rollers 24 loose in the openings'of the cams, will gravitate in the guides, and also, due to the formation of the cams, be pulled into normal position, the straight portion 33 being now again substantially flush with the edge of the platen.

It will also be noted that the apron 30 pulled taut ywhen the guard element is raised prevents' the operators hands from being advanced into the vmachine beneath or Vin back of the platen, and where they would be crushed upon the return of the platen to a normal position.

Frequently a card, envelop or some other printed matter, falls into the working mechanism of a press and the operator in a vain attempt to catch the falling card has his or her hand crushed in the press. lith the addition of the apron, however', the usual open-V Vings 1n the framev of the press, in front of the table, are covered and thus the operator cannot insert the hands. Aside from this,

' however, the apron is of vast importance, in

that it prevents printed matter that slips from the operators hand, from falling into the mechanism of the press, and furthermore when stacked printed matterV in the press falls over, as is ofttimes the case, due tothe jarring of the table, the apron here also,

will prevent the falling cards, venvelops orr readily attach the simple structure to thev press with lthe aid of ya simple form of wrench. Furthermore, Vin the operation of thedevice, the construction of the cams and theuse of the same with the remaining structure, accomplish a result,'that ordinarily vis notV attained,namely a quick and positive raising of the guard element into accident preventing position just before the otherwise criticalmoment when the hand orjngers of the operator wouldbe endangered. By having this action of the guard element positive and abrupt, the operator isboth warned and operated upon by the element striking the hand. It should be carefully noted thatv the movement of the guard element into safety position pulls the apron taut so that the apron as shown in Fig. 2 being also substantially simultaneous.

I-laving described my invention, I claim 5- Y 1. In a printing press guard, the combina-v tion with a form and a platen movable toward and away from said form, of a guard carried by ysaid platen and movable upwardly from the platen in the movementfof the latter toward the form and embodying a frame having lateral extensions thereon,

and brackets rigidly attached to the frame of the printing press and embodying arms formed with cam-shaped openings to receive said lateral extensions, whereby in the movement of the platen toward the form said ilo lateral extensions engage in said openings Y and slide said frame upwardly. Y

f ,2. In a printing press guard, the combination with a' form and a platen movable toward and away from said form,.of a guard carried by said platen and movable upwardly from the platen in the movement of Y the latter toward the form and embodying a frame having iateral extensions thereon, brackets rigidly attached to the frame lofthe printing press and embodying'arms formed with cam-shapedV openings to receive saidV lateral extensions, whereby in the movement of the platen toward the form said lateral extensions engage in said openings and slide said frame upwardly, arms projecting rearwardly from said brackets, respectively,and4

a flexible sheet having one edge connectedfto the rear edges of said arms and the otheredge connected to said guard and adapted to be drawn taut in the movement of the platen toward the form.

3. In a printing press guard, the combination with a form and a platen movable toward and away from said form, of a guard carried by said platen and movable upwardly from the platen in the movement of the latter toward the form and embodying an inverted U-shaped frame, guide tubes detachably connected to the platen and encircling the legs of the said frame, the lower ends of the legs of said frame being formedV with lateral extensions, and brackets detachably connected to the frame of the printing press and provided with arms having camshaped openings therein to receive said ex-k Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C.

Images