US2216710A - Press - Google Patents

Description

F, LINDGREN 2,216,710

PRESS Filed Aug. 27, 1937 2 Sheets-Sheet l INVENTOR Era/Amma 1A/neef BY wud m ATTORNEY ct. l, 1940. F L lNDGREN l y2,216,710

PRESS Filed Aug. 27, 1937 2 Sheets-Sheet 2 mvEN-ron Eem/mvp L/A/Deef/v BY Y;

ATTORNEY Patented Oct. 1, 1940 NUNITED STATES PRESS j Ferdinand Lindgren, Bridgeport, C onn., assignor to Boering SpecialtyA Co., Bri'dgeportyConn., a

corporation of Connecticut Application August 27, 1937, Serial No. 161,204

4 Claims.

The present invention relates to improvements in presses, particularly those of the small or bench type used to a considerable extent in light forming, assembling and similar operations.

Heretofore the majority of press developments have been directed to the construction of large size presses capable of performing heavy blanking, piercing and forming operations. 'I'hese presses ordinarily consist of crank, toggle and other like l expensive actuators in order to withstand the heavy duties to which they were normally subjected.

Subsequent developments in small presses were most often merely modifications of these large presses.

With the advent of large scale manufacture of office appliances, Wiring devices, radios and many other devices, having large assemblies of small parts, there has developed a definite need for inexpensive yet highly efficient presses capable of use in the wide variety of assembling, pressing, forming and like operations on small parts.

It is an important object of the present invention to provide a press which will be of very small and compact form so that it will take up but very little space upon a bench, and so that it may be readily removed when it is desired to have a cleared bench for other like operations.

A feature resulting from the attainment of this object is the provision of a very small yet powerful press, consisting of very few parts which can be made at very little cost.

It is sometimes preferable to have a press entirely set up at all times with one set of tools in proper registry for the performance of a single operation. However, because presses are usually quite expensive it is necessary to use a single press for many different operations thereby necessitating the breakup of tool assemblyl and the setting up of new tools therein. This necessitated a regular tool setter in manufacturing departments and necessitated the careful storage of individual or sets of small tools when the same were not in use.

It is an object of the present invention to provide a press of such small size and so inexpensive that it may have small tools assembled and continuously set therein for all time use on only one operation.

A feature resulting from the attainment of this object is the provision of a very small and inexpensive press upon which tools may be set continuously lfor only one operation, and which may be easily removed and stored in a tool crib or the like when the operation is finished. Thus, the

services and expense of a skilled tool setter making a breakdown and setup of tools is eliminated. Because of these factors, loss 'of small tools and tool setting costs'are greatly reduced, and because the press is inexpensive there is no machine overhead cost problem. f 5

Itis another object of the presentinvention to provide a press which will not necessitate the use of expensive cranks or the like, but which will nevertheless have a smooth and powerful action.

A feature resulting from the attainment of this 10 objective is the provision of a small yet powerful and efficient lever type 0f press operating mechamsm.

Other featuresof the invention include the provision of: a substantial and eflicient support for a 5 very light and inexpensive operating rod; a novel and highly eicient means for yieldingly supporting the operating mechanism of the press in a raised lposition normally, and for returning it to 20 the raised position upon completion of an operation thereof; a sturdy and advantageous support and guiding means for the operating lever whereby it is uniformly and positively guided in a straight path; a press and operating mechanism which makes possible the advantageous location 25 of the tools and work upon an'inclined angle.

Other objects, features and advantages will appear hereinafter.

. In the Vdravvingsr; 0

Figure 1 is a front view ofthe press, embodying the present preferred form of the invention.

Fig. Zis a side view of the press shown in Fig. 1.

Fig. 3 is airear View of the press.

Fig. 4 is a top view of the press.

Fig. 5 is a fragmentary sectional View taken on line 5 5 of Figs. l and 3. A Fig. 6 is a view similar to Fig. 5 of a modified form of connection between the operating rod and operating lever.

Fig. 7 is a fragmentary detaill view showing an 40 advantageousmeans for securing the press to a work bench or the like.

Before describing the present improvements and mode of .operation thereofin detail it should be understood that the invention is not limited to thedetails of construction and arrangement of parts shown in the accompanying drawings, which are merely illustrative of the present preferred embodiments, since the invention is capable of 50 other embodiments, and the phraseology employed is for the purpose of description and not of limitation.

Referring now in detail to the drawings, the present preferred embodiment of the invention, 55

y viding a surface upon which work may be set to be operated upon, or to support a tool of any desired type which may be secured thereto yas by any suitable screws entering conventional screw holes I6.

The forwardly projecting upper arm I I preferably is provided with 'a channel I1 adapted to accommodate and guide a ram I8 for slidable movement, preferably angularly relative to the base I0', toward and from the lower arm I2 and Work support I 5, to cooperate with any tool supported thereon or to operate upon any work carried thereby.

' Any suitable tool-.carrying medium may be provided upon the ram I8, such as a socket 28 and conventional setor locking screws 2|.

. A plate 22 with holding screws 23 is, provided to maintain the ram I8 in a confined condition in the channel I1. Preferably a snug yet easy sliding fit is provided between the ram I8 and channel I1.

Corning now to the operating' mechanism for the press it should be noted that the press of the present invention includes a lever 24 pivotally mounted upon a stud 25 in the rearwardly projecting upper arm I3, preferably conned against sidewise movement by lingers 13a, and I3b defining a slot 26 therebetween. The lever 24 is at its forward end provided with a ball or partial disc 21, adapted to enter a suitable transverse aperture 28 which may be in the form of an elongated rectangular slot near the center of the ram I8; or, as shown, it may be an openmilled cut in the side of the ram I8. Preferably, clearances 21' and 28 are provided upon the lever 24 and ram I8 respectively so that the latter parts clear each other satisfactorily when the ram I8 is moved to its lowered position.

Preferably, the plate 22 is provided with a slot 30 adapted to receive the forward end of the pivoted lever 24 to locate and support the forward end thereofwith respect to the ram I8 `and to prevent tilting or wobbling thereof during its movement with the ram I8 into the lowered and raised positions.v This structure facilitates smooth and easy action of the ram, or of the entire press.

In the present preferred embodiment of the invention the operating mechanism 29 includes an operating rod 32 with a pivot connection 33 substantially midway between the pivot 25 and ball or disc 21 `to provide an operating lever of the third class. The operating rod is preferably located andsupported in one or both suitable bores 35 and 35' in the upper and lower arms I3 and I4 respectively, as may be seen best in Fig. 2 particularly. 'Ihe pivot connection 33 is preferably, through the provision of a head 36 on the rod 32 provided with a slot 31, adapted to accommodate the lever 24, whereupon a pin 38 is passed therethrough, as may be seen best in Fig. 5. The head 36 may be made integral with the rod 32 or, as shown in Fig. 5, may be secured thereto as by threaded connection 40.

A coil spring 44, encircling the rod 32, underlying the head 3G, and overlying the top face of the lower arm I4 is provided to normally yieldingly maintain the pivoted lever 24 and ram I8 in the raised position, shown in Figs. 2 and 5. A pin 4B engaging a wall 41 limitsA upward movement of the ram I8 to the raised inoperative position. The bore 35' in the lower arm I4 may be merely drilled or otherwise formed therein, but, as shown, is preferably made as a sleeve 35111 to better withstand wear and to make possible replacement should there be excessive wear at any time. Substantial support of the operating rod 32 in both arm I3 and lower arm I4 insures a smooth and direct pull upon the lever 24 when moving the ram I8 to the lowered operative position, and a smooth return thereof. Because of the latter it is possible to use only a light weight spring 44 in the press. Therefore, it is necessary to use only light pressure when moving the ram I3 to the operative position which is a real advantage in lessening fatigue of the operator during the course of an entire days use of the device when the press may be operated many thousand times. Preferably, however, the sleeve 35a is of substantial length, as shown in Fig. '7, adapted to project through a suitable hole 48 in a .bench ,49 or the like, and is at its lower end provided with a thread 35d upon which a knob 50 may be screwed to hold the fixture upon the bench.

As shown in Fig. 5, the connection 33 is provided with slight looseness between the head 36 and bore 35 to allow for a slight forward movement of the head 36 as the lever 24 is moved arcuately about the pin 25 to the lowered position. However, by having the bore slightly elongated, as shown with-dot-and-dash lines 3522y in Fig. 4, the head is held against lateral shifting movement, yet permits slight arcuate movement thereof with the lever.

The operating rod 32 may be connected to any conventional type of treadle arrangement, such as the conventional foot pedal treadles of the secondclass now in very extensive use. Therefore, it is thought unnecessary to show the same in the present drawings.

Fig. 6 shows a slightly modified connection 33' including a close fitting bore 35o accommodating the head 36 and a slightly elongated slot 38 accommodating the pin 38 in the head 36 which permits a slight shifting of the position of the pin 38 with respect to the main pivot pin 25 as the lever 24 is moved to and from the operative and inoperative positions.

Other variations and modicaticms may be made within the scope of this invention and portions of the improvements may be used without others.

Having thus described the invention what is claimed as new is:

1. In a press the combination of a substantially I-shaped main frame; upper and lower forwardly projecting arms on the main frame, forming supports; a ram in one of said arms; upper and lower rearwardly projecting arms on the main frame; a lever pivotally connected to said rearwardly projecting upper arm, and associated with said ram; a sleeve in said lower rearwardly projecting arm and having a portion extending therefrom adapted to be inserted in a hole in a work bench; a knob in threaded relation with said extending portion, adapted to hold the frame on the work bench; and an operatingy rod passing through said sleeve and connected to said lever.

2. In a press the combination of a substantially I-shaped main frame, having a base; upper and lower forwardly projecting arms on the main frame; a ram in said upper forwardly projecting arm; means for guiding and supporting said ram in said upper forwardly projecting arm for movement at an acute angle relative to said base; upper and lower rearwardly projecting arms on the main frame; a lever pivoted at one end on said rearwardly projecting upper arm and connected at the other end to the ram; an operating rod connected to the central portion of said pivoted v lever, located slidable upwardly and downwardly in said upper and lower rearwardly projecting arms; means for laterally guiding and supporting said rod in said upper and lower rearwardly projecting arms; a threaded member upon. said lower rearwardly projecting arm adapted to be inserted in a hole in a work bench; and a knob in threaded relation with said threaded member adapted to hold the frame on the work bench.

3. In a press the combination of a substantially I-shaped main frame; an upper forwardly projecting arm on the main frame, said arm vhaving a channel; a ram having an aperture, slidable in said channel; an upper rearwardly projecting arm; a lever pivoted at one end on said l upper rearwardly projecting arm and extending through the aperture of said ram; a plate, conning said ram in said channel, having an aperture adapted to receive and guide the forward vend of the pivoted lever against adverse sidewise movement; a lower forwardly projecting arm;

va lower rearwardly projecting arm onrthe main frame; a sleeve in said lower rearwardly projecting arm and having a portion extending therefrom adapted to be inserted in a hole in a work bench; a knob in threaded relation with said extending portion, adapted to hold the frame on the work bench; an operating rod passing through said sleeve and connected tothe central portion of said pivoted lever, located and guided by at least one of said rearwardly projecting arms against adverse sidewise movement; and a spring adapted to yieldingly urge said operating rod into a raised position.

4. In a press the combination of a substantially Lshaped main frame, having a base; a lower forwardly projecting arm on the main frame, adapted to serve as an angularly disposed xed tool and work support; an upper forwardly projecting arm on the main frame, said arm having a channel disposed at an acute angle relative to said base; a ram having an aperture, slidable in said channel; an upper rearwardly projecting arm; a lever pivoted at one end on said upper rearwardly projecting arm and extending through the aperture in said ram; a plate, conning said` ram in said channel, having an aperture adapted to receive and guide the forward lend of the 4pivoted lever against adverse sidewise movement; a lower rearwardly projecting arm; an operating rod connected to the central portion of said pivoted lever, located and guided against adverse lateral movement by at least one of said rearwardly projecting arms; and a spring adapted to yieldingly urge said operating rod into a raised position.

i FERDINAND LINDGREN.

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