US2364661A

US2364661A - Toggle press

Info

Publication number: US2364661A
Application number: US466468A
Authority: US
Inventors: Fredrich J Rode; Meredith R Hatch
Original assignee: EW Bliss Co Inc
Current assignee: EW Bliss Co Inc
Priority date: 1942-11-21
Filing date: 1942-11-21
Publication date: 1944-12-12
Anticipated expiration: 1961-12-12
Also published as: BE480645A; FR950970A; GB587630A

Description

Dec. 12, 1944.

F. J. RODE ETAL TOGGLE PRESS Filed Nov. 21, 1942 7 3 Sheets-Sheet l 00 OOO Dec. 12, 1944- F. J. RODE ET AL TOGGLE PRESS Filed Nov. 21, 1942 3 Sheets-Sheet 2 FIGZ.

ATTORNEYS.

1944- F. J. RODE ET AL 2,364,661

TOGGLE PRES S Filed Nov. 21, 1942 3 Sheets-Sheet 6 ATTORNEYS.

Patented Dec. 12, 1944 TOGGLE PRESS Fredrich J. Rode and Mi:

Brooklyn, N. Y., a corporation Ohio, assignors to edith R. Hatch, Toledo,

W. Bliss Company,

of Delaware 1 Application November 21, 1942, Serial No. 466,468

17 Claims.

This invention is directed to improvements in double action sheet metal presses of the front to back type, i. e. of the type wherein the axes of the driving mechanisms for the main or die slide and the blank clamping slide extend from the front to the back of the crown of the press as distinguished from presses wherein such mechanisms have axes extending from side to side of the press.

Front to back presses have been built heretofore incorporating a gear driving system of pinions and bull gears drivingly extending to the crank shaft of the press and with associated toggle mechanisms for operating the clamping slide all arranged within the front and back bearing walls of the crown casting. While operatively satisfactory, the assembly and repair replacement problems of presses of large capacity and size detracted from the advantages otherwise presented by such presses ,over the side to side type of press. Wherefore the general object of the present invention is the provision of a novel arrangement of the elements of the die slide drive and the clamping slide drive so that the toggle mechanism or mechanisms can be disposed on the outside of the main crown structure while remaining in efilcient cooperative relation to the die slide drive mechanism and whereby the fitt ng and assembly of the mechanical elements of the respective mechanisms can be effected independently.

A further object of our invention is to overcome the disadvantages of a combined gear drive and toggle drive heretofore cooperatively grouped in a crowded interdependent manner between the front and back walls or beams of the press crown structure.

A further object of the present invention is the provision of a novel arrangement of the toggle mechanisms of a front'to back double action sheet metal press on the outside of the front and back beams or walls of the crown structure whereby the distance between these walls may be substantially decreased over prior practices while permitting of a direct transmission of force to the press crank and the avoidance of the transmission of the main torque load through the main crankshaft bearings of the crown structure.

Other features of our invention will appear to those skilled in the art from the following description which refers to the accompanying drawings illustrating a preferred embodiment thereof.

I The essential'characteiistics of the invention are summarized in the claims.

In said annexed drawings:

Fig. 1 is a front elevation of a sheet metal press embodying the features of the invention;

Fig. 2 is a top view of the crown and associated mechanism as viewed with the top cover, the clutch and brake removed;

Fig. 3 is a cross-sectional elevation taken in two planes as indicated by the step back line 33 of Fi 2 and showing the crown, the die slide and the associated mechanisms for operating the die slide and work clamping slide; and

Fig. 4 is a cross-sectional elevation of the upper part of the crown structure taken substantially along the line 4-4 of Fig. 1.

Referring more particularly to Fig. 1, the press will be seen to comprise a base 6, spaced uprights mounted thereo and a crown 8 supported by these uprights and provided with a removable cover 9 on top. Extending through the base, uprights, and crown are tie-rods 5 adapted to hold the above mentioned parts in place, and openings I 2 are provided in the crown (see Fig. 2) through which the tie-rods pass and on top of which they are fastened by nuts (not shown).

Mounted within the press between the uprights 1 is a reciprocating blank clamping slide Ill guided during its movement in gibs H, which are bolted to the uprights.

The crown is provided with bearings for the drive shaft and supports most of the drive transmitting members. As already mentioned above, according to the novel arrangement of this invention an important part of the drive transmitting elements is disposed on the outside of the main crown structure, a feature which greatly improves accessibility to such parts of the press.

The drive mechanism which will now be described with reference to Figs. 1, 2 and 4, comprises a flywheel l4 driven from a motor shaft l3 by means of an endless belt I5. The flywheel is mounted for idle rotation on a shaft l6 which is journalled in bearings ill of conventional design, said bearings being secured to the crown as at IT. Keyed to shaft iii are a clutch l9 and a brake 20. The clutch shown is of the single plate dry disk type, but it will be understood that any other convenient clutch could be used as well.

On the other side of the flywheel I4, as shown in Fig. 4, the drive shaft has keyed thereon a pinion 23 which is in driving engagement with a gear 24. The hub of this gear is mounted on one end of a sleeve 25 whose other end forms a pinion 26. Both end portions of sleeve 25 having a cylindrical recess adapted to receive

sleeveshaped bearings

21 and 28 respectively, the balanoe of which is disposed within journaled portions 30 of the crown.

Carried by bearings 21 and 2' and the portion of sleeve 25 extending between said two bearings, is a shaft 29, which is one of the rocker shafts on which one pair of toggle levers forming the drive for the die slide are mounted. Shaft 29 extends from the front to the rear of the crown and carries one of the above mentioned toggle levers at, each end, the front toggle lever being shown in Fig. 1 and designated by 3|.

The above mentioned pinion 26 is in engagement with a gear 33 mounted on a shaft 34 which is parallel to shaft 23 and forms the second rocker shaft for supporting the other two toggle levers at its front and back end respectively. One of these toggle levers is shown and designated by 35 in Fig. 1. Shaft 34 also carries two

pinions

36 and 31 which drive two

bull gears

38 and 3! respectively, which are mounted on a stepped portion ll of the main crankshaft 4| and drive the cheek ll of the crank shaft.

The crank shaft as shown in Fig. 3 is a stepped shaft, the main portion III of which is journalled in sleeve bearings 42 carried by the crown casting. The outermost stepped portion 43 serves to support a pivotally mounted crank 53 which is a driving connection to the toggle mechanism to be later described. The crank cheeks of the main crank are shown at ll and the crank pin at 45, while 16 designates the eccentric strap whose free end is connected to a pin 41 which is carried by a member I! forming part of the die slide 54.

The effective length of the die slide is capable of adjustment by any suitable mechanism well known to the art such as that mechanism diagrammatically shown at 58, which is operated by a motor 39. The motor 9 drives the worm shaft 50a and the worm 50b disposed in meshing relation with the worm wheel This wheel 5| is carried by a block 52 which is in threaded engagement with the member 48. By this arrangement it is possible to lengthen or shorten the slide 54 as required.

Slide 5| is provided with an extension 55 which forms a circular trough for receiving oil that may drip down from the bull gears and may be drained at 55.

The arrangement of the toggle mechanism will now be described with reference to Figs. 1 and 3. As already mentioned the main crankshaft III is provided at each end with a stepped portion 43 for the mounting of a small crank 53 that is linked at 5| to a connecting member 59 having its free end pivoted to a slide member 60. This member is mounted for up and down movement in ways SI and, at its upper end, has pivotally connected thereto links 2, 3 making connection with toggle members 3| and 35 respectively.

These toggle levers are joumalled at their other ends to connecting

rods

65 and 66 which in turn are pivoted at their other ends to adjustment screws BI and 69 located within bosses II and 'Il formed on the outside of slide II. The screws are arranged to cooperate with double lock nuts 13, ll, respectively, which in their locking position abut on shoulders of the bosses II. For adjustment of the screws one of the lock nuts is loosened whereupon the other-may be turned, thereby making screw $3 move up or down respectively and changing the stroke of the clamping slide to greater or smaller length as required.

It will be understood that the toggle mechanism comprises two toggles on the front wall of the crown and two on the back wall, ,all of which work in unison, though they may be individually adjusted by the screw and double lock nut mechanism just described. The screw mechanism is used to adjust the clamping slide to the height of the die space, thus insuring a perfect cooperation between the respective parts of the double action press.

The operation of the press does not need any further explanation since it will be clearly understood from the foregoing description. It will be likewise understood that the novel arrangement of the toggle mechanisms on the outside of the crown structure affords several advantages, the most important of which are accessibility of parts for assembly and repair and compactness of crown structure owing to the fact that the crown only houses the drive mechanism for the die slide between its walls. Another advantage is the better distribution of torque load since the construction makes it possible to avoid the transmission torque of the main crank pin through the main crankshaft bearings of the crown.

Also, it will be apparent that the disclosed arrangement of the main crank drive entirely within the crown walls and the toggle mechanism outside of the crown walls permits of a very substantial reduction of the distance between the main crankshaft bearings, a feature which is highly desirable in heavy press structure of the general type to which this invention pertains. This arrangement isconducive to compactness in the entire design of the press and the operating parts can be enclosed conveniently without substantial increase in the cost of manufacture thereof.

Should one of the toggle mechanisms break down it is practical to operate the press with. only one set of toggle mechanisms and in some classes of production the press is equipped with only one toggle drive from the main crankshaft, in which instance the rocker shafts would be heavier than in the case of a double toggle drive arrangement operating from each end of the main crankshaft. All toggle parts are accessible without disruption of the gear train drive.

Itwill be apparent to those skilled in the art that the toggle arrangement disclosed simplifies the obtaining of a uniform distribution of the four-point pressure application to the work clamping slide.

Other advantages will be apparent to those I skilled in the art and the disclosure is not to be considered as a limitation of the invention other than we have defined the same in the appended claims.

Other modes of applying the principle of our invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

We therefore particularly point out and distinctly claim as our invention:

1. In a sheet metal working press of the double action front to back type the combination of a gear train arranged to drive a main crankshaft, a die slide driven by the crankshaft, dual toggle mechanism for operating the work clamping slide of the press including two rocker shafts rotatably supporting members of said gear train, and mean interconnecting said crankshaft and said rocker shafts for imparting a rocking movement to said rocker shafts to thereby actuate said toggle mechanism.

2. In a sheet metal working press of the double action front to back type, the combination of a crown structure comprising a front and a back beam, '12, main crankshaft Journalled in said beams, a gear train disposed between said beams to drive the crankshaft, toggle mechanism disposed to the front and rear of said beams respectively and adapted to operate the work clamping slide of the press, said toggle mechanisms including rocker shafts extending through said front and back beams of the crown structure and serving to rotatably support certain of the clamping slide of the press, said toggle mechanisms including two rocker shafts extending through said front and back beams of the crown structure and serving to rotatably support certain of the members of said gear train, and means including an auxiliary crank mounted at each end of said main crankshaft, for imparting a rocking movement tosaid rocker shafts.

4. In a sheet metal working press of the double action front to back type, the combination of a crown structure comprising a front and back beam, a main crankshaft journalled in saidbeams, a gear train disposed between said beams to drive the crankshaft, dual toggle mechanism disposed to the front and rear of said beams respectively and adapted to operate the work clamping slide of the press, said toggle mechanisms including two rocker shafts extending through said front and back beams of the crown the press, and having structure and serving to rotatably support certain of the members of said gear train, and means mounted on the crankshaft but remote from the crank for imparting a rocking movement to said rocker shafts.

5. A double action sheet metal press of the front to back gear and toggle drive type having the gear train for driving the crankshaft of the die slide of the press arranged entirely between the front and back beams of the crown-structure of the press and the toggle mechanisms for driving the work clamping slide arranged on the outside of the front and back beam structure of the crown, said toggle mechanisms including toggle rocker shafts extending through the said crown beams and serving as supports for members of the gear train, and means connected to said crankshaft and to said rocker shafts for imparting a rocking movement to said rocker shafts to thereby actuate said toggle mechanisms.

6. A double action sheet metal press of the front to back gear and toggle drive type having the gear train for driving the main crankshaft of the die slide of the press arranged entirely between the front and back beams of the crown structure of the press and having dual toggle mechanisms for driving the work clamping slide arranged on the outside of each of the front and back beam structures of the crown, said toggle mechanisms including two parallel toggle rocker shafts extending through the said crown beams and serving as supports for members of the gear train, and means including two more cranks, one at each end of the main crankshaft for imbeam,

through said toggle Shafts.

parting rocking movement mechanisms to said rocker 7. In a sheet metal working press of the double action front to back type, the combination of a crown structure comprising a front and back beam, a main crankshaft joumalled in said beams, a gear train disposed between said beams to drive the crankshaft, toggle mechanism disposed to the front and rear of said beams respectively and adapted to operate the work clamping slide of the press, said toggle mechanisms including two rocker shafts extending through said front and back beams of the crown structure, one of said rocker shafts having rotatably mounted thereon an intermediate gear driven from a pinion on the main drive shaft of furthermore rotatably mounted thereon a pinion for driving a second intermediate gear. 7

8. In a sheet metal working press of the double action front to back type, the combination of a crown structure comprising a front and back a main crankshaft journalled in said beams, a gear train disposed between said beams to drive the crankshaft, toggle mechanism disposed to the front and rear of said beams respectively and adapted to operate the work clamping slide of the press, said toggle mechanism including two rocker shafts extending through said front and back beams of the crown structure, one of said rocker shafts having rotably mounted thereon an intermediate gear driven from a pinion on the main drive shaft of the press, and having furthermore rotatably mounted thereon a pinion for driving a second intermediate gear while the second" rocker shaft is adapted rotatably to carry a pair of pinions serving for the drive of a pair of bull gears, said bull gears being mounted in driving connection with the cheeks of said main crankshaft.

9. In a sheet metal working press of the double action front to back type, the combination of a crown structure comprising a front and a back beam, a main crankshaft journalled in said beams, a gear train disposed between said beams to drive the crankshaft, toggle mechanism disposed to the front and rear of said beams respectively and adapted to operate the work clamping slide of the press, said toggle mechanisms including two rocker shafts extending through said front and back beams of the crown structure, one oil said rocker shafts having rotatably mounted thereon an intermediate gear driven from a pinion on the main drive shaft of the press, and having furthermore rotatably mounted thereon a pinion for driving a second intermediate gear, and means mounted on said crankshaft but remote from the crank for imparting a rocking movement to said rocker shafts.

110. In a sheet metal working press of the double action front to back type, the combination of a crown structure comprising a front and a back :beam, a main crankshaft journalled in said beams, a gear train disposed between said beams to drive the crankshaft, toggle mechanism dis posed to the front and rear of said beams respectively and adapted to operate the work clamping slide of the press, said toggle mechaintermediate gear while the second rocker shaft i adapted rotatably to carry a pair of pinions serving for the drive of a pair of bull gears, said ,bull gears being mounted in driving connection with said main crankshaft, and means mounted on said crankshaft but remote from the crank for imparting a rocking movement to said rocker shafts.

11. In a double action sheet metal press of the front to back gear and toggle drive type the combination of a crown structure comprising a front ing toggle rocker shafts extending through the said crown beams, one of said rocker shafts having rotatably mounted thereon an intermediate gear driven from a pinion on the main drive shaft of the press and having furthermore rotatably mounted thereon a pinion for driving a second intermediate gear while the second rocker shaft is adapted rotatably to carry a :pair of pinions serving for the drive of a pair of bull gears, said bull gears being mounted in driving connection with said main crankshaft, and means mounted on said crankshaft but remote from the crank for imparting a rocking movement to said rocker shafts.

12. In a sheet metal working press of the double action type, a front to back rocker shaft arrangement extending through the crown of the 'press and operatively connecting a toggle mechanism disposed at the front of the crown to a toggle mechanism disposed at the back of the crown and a gear train drive for the die slide of the press disposed within the crown with certain of the gear elements of said train rotatively mounted upon said rocker shaft arrangement.

13. In a sheet metal working press of the double action type, a front to back rocker shaft arrangement comprising two rocker shafts extending through the crown of the press and operatively connecting a dual toggle mechanism disposed at the front of the crown and a dual toggle mechanism disposed at the back of the crown, said toggle mechanism serving to drive the work cl ping slide and a gear train drive for the die sli e of the press disposed within the crown with certain of the gear elements of said train rotatively mounted upon said rocker shaft arrangement.

14. In a sheet metal working press of the double action type, a front to back rocker shaft arrangement comprising two shafts extending through the crown of the press and operatively connecting a dual toggle mechanism disposed 0n the outside of the front of the crown and a. dual toggle mechanism disposed on the outside of the back of the crown, said toggle mechanisms serving to drive the work clamping slide and a gear train drive for the die slide of the press including the main crankshaft disposed within the crown with certain of said gear elements rotatively mounted upon said rocker shaft arrangement and meansrnounted on said crankshaft for imparting a rocking movement through said toggle mechanisms to said rocker shafts.

15. In a sheet metal working press of the double action type, a front to back rocker shaft arrangement comprising two shafts extending through the crown of the press and operatively connecting a dual toggle mechanism disposed on the outside of the front of the crown and a dual toggle mechanism disposed on the outside of the back of the crown, said toggle mechanisms serving to drive the work clamping slide and a gear train drive for the die slide of the press including the main crankshaft disposed within the crown with certain of said gear elements rotatively mounted upon said rocker shaft arrangement, and means including an auxiliary crankshaft mounted at each end of said main crankshaft for imparting a rocking movement to said rocker shafts.

16. In a sheet metal working press of the dollble action type, a crankshaft for operating the die slide of the press extending from front to back of the press and disposed centrally between the sides of the press, a pair of rocker shafts extending from front to back of the press and having toggle mechanisms at their ends for driving the work clamping slide of the press, a gear train for driving said crankshaft, and means driven by said crankshaft for actuating said toggle mechanisms.

17. In a sheet metal press of the double action type, a crown structure having a front and a back beam, a crankshaft for operating the die slide of the press extending from front to rear of the press and disposed centrally between the sides of the press, said crankshaft having a portion projecting forwardly of the front beam and a portion projecting rearwardly of the back beam, a pair of rocker shafts journalled in said beams and having iportions projecting forwardly of the front beam and rearwardly of the back beam, toggle mechanisms including levers mounted on said projecting portions of the rocker shafts for driving the work clamping slide of the press, means interconnecting said projecting portions of the crankshaft with said levers for rocking said shafts through said levers, and a gear train disposed between the front and back beams for driving said crankshaft, said train including gears revolubly mounted on said rocker shafts.

FREDRICH J. RODE. MEREDITH R. HATCH.