US1298568A - Safety device. - Google Patents

Description

C- F. ROOT.

SAFETY DEVICE.

APPLICATION FILED ocr. 30. m4.

1,298,568, Patented Mar. 25,1919. Y

3 SHEETS-SHEET l- WITNESSES C. F. ROOT.

SAFETY DEVICE.

APPLICATION FILED OCT. 30. l9l4.

Patented. Mal-.25, 1919.

3 SHEETS-SHEET 2- ljiy g. 3

,JNVE/VTOR A MZL/MW 1 u fllforney WZTNESSES:

QM g/w BY C. F. ROOT. SAFETY DEVICE.

APPLICATION FILED OCT. 30. 19M.

1,298,568. Patented M111. 19m.

3 SHEETS-SHEET 3- 1 [VI/EN TOR I 72x5; Alf/2711a W1 TNESSES UNITED STATES PATENT o EIoE.

CHARLES F. ROOT, OF RAVEENA, OHIO, ASSIG-NOR OF ONE-FOURTH TO BYRON 0. CONN OF MANSFIELD, OHIO.

SAFETY DEVICE.

Specification of Letters Patent.

Patented Mar. 25, 1919.

Application filed October 30, 1914. Serial No. 869,468.

To all whom it may concern:

Be it known that I, CHARLEsF. BOOT, a citizen of the United States of America, re-

siding at Ravenna, in the county of Por-- that im arts movement to the reciprocating.

or oscillating work engaging element from operating when an obstruction is inadvertently or otherwise placed between the element and the anvil or bed and upon engagement of the element with the obstruction.

It is well known in the operation of machines, that are provided with a reciprocating or oscillating work engaging element which exerts a pressure vupon an anvil or bed, that there is great danger of the operators fingers or hands being inadvertently placed between the anvil or bed and the reciprocating or oscillating element that exerts a pressure to' perform the work with the result that the fingers or hands are crushedor injured.

This is especially true when it is necessary for the operator of the machine to perform work that requires him to place his hands or fingers in close proximity to that part of the anvil or bed upon which the work engaging. element exerts apressure to perform its work and in manipulatlng the work the operators hands or fingers are liable to slip between the work engaging element and the anvil or bed at the time the work engaging element is. about to exert a pressure to perform its work thereby in- ,bed to perform the work when an obstruction is interposed between the anvil or bed and the reciprocating or oscillating element.

Further, the invention aims to provide means which is incorporated'in the reciprocating or oscillating element so as to only render the latter operative or rigid (at a predetermined point) just prior to or at the instant of the commencement of the punching, pressing, printing, joining or stamping operation, or, in other words, at the instant that the reciprocating or oscillating element is about to enter into actual or physical contact with the work.

. The invention further provides means which is sensitive to operation by the finger or hand of the operator, should the finger or hand be in a position subject to injury by the reciprocating or oscillating element, without actual injury to the finger or hand.

Further, the invention aims to provide a structure which can be adjusted to operate in connection with material possessed of varying thicknesses.

The objects above described are set forth in Letters Patent ranted to me hearing date .of March 9, 1915,?Patent Number 1,131,161;

pending application bearing Serial Number 857.016, filed Aug. '17, 1914; and pending application Serial No. 864,974, filed Oct. 5, 1914; and the present application has the same objects in view in a generic sense but includes specific improvements in the structure described in said application, and consists in the following new features:

' A cam operated coupling member which is adapted to couple and uncouple a link mechanism to and from the crank pin, a separable stationary cam plate for operating the coupling member that can be attached to and removed from the driving means of a reciprocating or oscillating ele ment of a machine without changing or altering the machine or driving means, and means for coupling the work engaging element to and positively preventing the crank manner that when the work engaging element is subjected to resistance or pressure before the work engaglng element reaches a predetermined point in its working stroke,

that/it will tidle instantly because the crank pin of the driving means is permitted to complete its working stroke. freely and inde lowing instrumentalities' p a pendent of there is DOfI'lOillOIl between the parts comprising thecoupling means to be overcome.

Figure 1' is a frontelevation of a conven+ is tional type of alstaying machineshowing mounted thereon) and work engag ngQelement.

my invention appliedthereto and also showing the finger of the operator interposedbetween the anvil (which has a paper box the rec procating In this View the couplin'gmemberis shown in uncoupled position as the work engaging element has been subjected to pressure Q by the finger before reaching the p e-determined pressure point of its working stroke.

i Fig.2 is a detail view, in front elevation, of the slotted link, coupling member; stationary cam late, and auxiliary parts show- H {ing the coup ing member in uncoupled positionin full linesand in coupled position in dotted lines.

, i ,Fi 3:is-afside ,view partly in section "showlngfthe slotted a member mounted thereon,

' bled with thestationary cam plate, the end of which 'is loosely fitted over the periphery link with the coupling and both assemof the diskof the driving means.

7 of F g.1" on a reduced scal .Fi 4'isa'side'elevation partly in section 6- Fig. 5 ,is a side elevation of the slotted end of theli nk howinga yielding frictionmechanism ap' lied thereto.' fFig. a plan view partly in section of i In ' the shaft being journaled in suitable bear- "thereto;

type of a staying imparted to the driving shaft 1 by the driv- Fig. 5 v

p the drawings,'thc driving sh aft 1 ,is provided with a disk 2 having a crank 'pin' 3,

arm machine.

ings in the" L" shape 4 of a conventional Movement is ing pulley 5. Ahead 6 reciprocates between the ways 7 and has a stud .haft 8 secured A follower or work-engaging elemerit 9 is securely attached to the head6 and 'coeperates with the usual anvil (or bed)*10 of a staying machine or the like.

Forthe purpose of connecting the stud shaft8 of the head to the crank 3 of the driving shaftl, by means of which a'reciprocating movement is imparted to the head 6, a link 11 which is adapted to be coupled the coupling means and becauseplate is provided witha cam 25 ment-to the yondthepoint 30 of the cam at and to messes withthecrank pin 3 by the coupling member 12, is provided. The link 11 is cutaway or reduced on one side thereof at 13 forming va shoulder 14. A circular depression 15 is. formed in the side of the link that forms the shoulder 14- and-the end 16 of the coupling member is pivotally fitted in said circular depression.

The circular depression tiguous with the cut away portion 13" and is located so as to provide a pocket for the end16 of the cou ling member,-by means of 15 is formed conwhich the coupling member is maintained in its proper place. Abushing vided with "an annular flange 18 is refer ably mounted upon the crank pinn T e link '11 is provided with an oblongslot In assembling, applying and constructing my safety device, is provided having its upper end counterbored at 21" to fit over the disk'2 andwthe other end is'provided-With a slot-22 to fit the periphery of the bushing 23 by means of which the 'statlonary place and provides a clearance space for the stud shaft'8 to travel in. ."The crank'pin 3 projects through the aperture 24: of the cam plate. -The:link 11 17 which is procam plate is held in -r a stationarycam plate-2O carrying the coupling member is+loosely the crank pin or the bushing Fig. 2. Thecam and apin 26 to the'coupling member and is mounted upon 17 thereof, as shown in is secured adapted to coiiperate with the cam to actuatethe coupling member. Anaperture27, is

formed in one end of theilink 11 to provide a bearing for the stud shaft 8 of the head 6. An annular flange 28 isprovided on the bushing 23 for the purpose of keeping the stationary cam plate andlink in juxtaposi tion to" each other.

- The operation of my device upon every revolution-of the driving shaft, is asfollows When movement 1s imparted to the drivl ing'shaft the crank in3 imparts a combined oscillatingand reciprocating movelink which carries the coupling member with it. When the; crank. pin

which carries the link'commences or is about to travel upon its down or working stroke,

the 'throwflof the link in one direction forces the cam pin-2 6 in'contact with the point 29 of the cam25 thereby actuating the. coupling member and-forcing it torock -to'its un--1 coupled position, as shown in full lines in Fig. 2-, the cou ling member then remains-in said uncouple position during its working stroke until the pin 26 reaches and asses bethe pin is released from the cam, permitting the couplingmember to rock upon its pivot be forced to its coupled position which brings the end 31 of thecoupling which point member directly underneath the crank pin 3 I.

in a position to receive pressure from the crank pin during the balance of the working stroke.

When the link reaches the end of its working stroke and starts its up or idle stroke, the throw of the link in the opposite or reverse direction carries the pin 26 through the clearance space 32, which is formed in the cam plate, until it again reaches the point 29 of the cam 25 atv which time the above described operation again takes place. A coil spring 33 is attached to the link and coupling member 12 andnormally exerts its tension to rock the coupling member and force it to its coupled position beneath the crank pm so that at the instant the cam pin 26 is released, the end 31 of the coupling member is forced beneath and coupled with the crank pin, as

shown in dotted lines in Fig. 2.

In practice, I have found it'convenient to arrange the cam so that it will permit the coupling member to couple the crank pin to the link for the purpose of exerting a pressure upon the work engaging element just prior to its acting on the work. It is apparent, however, that the crank pin can be coupled to the link for exerting a pressure upon the work engaging element at varying points in its worklng stroke by changing the dimensions of the cam.

The above describes the operation of my device when it is operating normally without any obstruction bein projected or interposed between the wor engaging element and its anvil or bed.

If an obstruction, as for instance the finger 34, is interposed orprojected between the work engagin element 9 and the work on the anvil 10 bed) and the work engaging element contacts with said obstruction in making its working stroke before it reaches the predetermined oint at which it is subjected to pressure or the urpose of actin ,upon the work, the head Wlll be arrested an idle. and the crank pin will travel in the slot 19 freely and independent of .the link or its mechanism as the cam pin will be in contact with the cam positively preventing the coupling member from being forced by the spring 33 to coupled position as shown by dotted-lines in Fig. 2. The crank pin continues to travel freely in the slot 19 until the obstruction is removed permitting the head and link to drop by gravity, the link sliding in the slot 19 over the periphery of the crank pin until the cam pin passes the point 30 of the cam 25 at which point the pin enters the clearance space 32 permittingthe coupling member to be again forced into cFoupl2ed position as shown by dotted lines in My device is so constructed that the work engaging element is preferably not subjected to pressure to perform its work untilit is in close proximity, to or just about to contact with the work so that any object, such as a .a proper relative position for coupling the crank pin to the link.

Attention is called to the fact that the coupling member is held in uncoupled position by cam action until the work engaging element reaches a predetermined point in its Working stroke, and that the statlonary cam plate can be readily attached to the end of the driving shaft and held in place by the bushing 23 without altering the machine in any way and without the use of any appliance other than the device itself which is self contained.

It will further be noted that the parts cannot be improperly assembled as they must be mounted and held upon the bushing or crank pin in operative relation preparatory to connecting them to a staying machine or the like. The coupling member is prevented from rocking too far underneath the crank pin by the stop 37.

The combination, construction and arrangement of the parts as above described, provide a non-collapsible means for connecting the crank pm and work engagmg element which permits the crank pin to exert a pressure upon the Work engagmg element at a predetermined point in its working stroke when its path is free and means to permit the crank pin to travel freely and independent of any mechanism when the work engaging element is subjected to pressure prior to its reaching said predetermined point in its Working stroke.

What is claimed is:

1. In a safety device, in combination with a reciprocating work engaging element, a driving means, and means to connect the driving means and work engaging element including a stationary cam plate carried by the driving means and having a cam formed therein, a link, a coupling member movably connected to the link and normally tending to operative movement, and means on the coupling member to engage the cam to hold the member inoperative until the work-enmechanism andhaving a cam formed therein i the cam to hold the coupling member from driving means, said coupling member being carried by and pivotally seated on said link, a stationary plate connected to the driving and its free end bifurcated to fit the stud shaft, and means on the coupling member to cooperate with the cam, said cam being formed so that said coupling member is prevented from exerting a pressure upon the work engaging element until it reaches a predetermined point, in its working stroke.

4. A safety attachment for machines equipped with a reciprocating work-engaging element, a driver and an anvil, and means to actuate said element from the driver comprising a link, a coupling member on the link and a stationary cam plate to move said coupling member from engagement. with the driver, said coupling member being movable transversely of the y axis of the driver to and from a position of direct coupling engagement with the driver. 5. In combination with a work engaging element, an anvil and a driving mechanism having a crank pin, a link slidably attached to said crank pin, a coupling member cooperative directly with the crank pin and pivotally attached to said link, and means to actuate the coupling member to auto matically and rigidly couple the link to the crank pin so as to cause the work engaging element to exert pressure upon the anvil at apredetermined point in its working stroke. p 4

6. In combination with a Workengaging element carrying a stud shaft and a bushing, ananvil and a driving mechanism having a crank pin, a link slidably attached to said crank pin, a coupling member directly cooperative with the crank pin and pivotally attached to said link, and stationary cam means to actuate the coupling member to automatically and rigidly hold the link in uncoupled relation to the crank pin so as to cause the work engaging element to avoid pressure upon the anvil if the element encounters an object extraneous to the work before it reaches a predetermined point in its working stroke.

7. In combination with a work engaging element and driving mechanism embodying a crank, means to automatically couple said driving mechanism and "Work engaging element comprisinga rigid link and a coupling member, said coupling member being piv-- oted on the link and'movable transversely of the axis of the crank 'to and from a position of direct coupling'engagement with the crank, and means toiprevent'said coupling member and link from operating the work engaging element when an object extraneous to the work is engaged by the element while the latter is upon its working stroke.

8. In combination with a work engaging element and a driving mechanism embodying a crank, means to couple said driving mechanism and Work engaging element comprising a rigid link and a coupling mem-' ber, said coupling member being pivoted on the .link and movable transversely of the axis of the crank to and from a position of direct coupling engagement with the crank, and means to prevent said coupling member from engaging the driving, mechanism ri id link and a coupling member to couple said drivinrr means and work engaging ele ment to subject the work engaging element to a pressure when it reaches a predetermined point in its working stroke, said coupling member being pivoted on the link and movable transversely of the axis of the crank to and from a position of direct coupling engagement with the crank, and

means to prevent coupling of the member and driving mechanism so as to prevent the Work engaging member from being subjected to pressure upon encountering an obstruction extraneous to the workbefore it reaches said predetermined pressure point.

10. In combination with a work engaging element'and driving mechanism, means comprising a yieldingly mounted rigid link and a coupling member to couple said driving means and work engaging element to subject the work engaging element to pressure-when it reaches a predetermined point in its working stroke, and "stationary cam means toicooperate with the coupling member and preventcoupling of the member and driving mechanism to prevent the work engaging member from being subjected to pressure upon encountering an obstruction extraneous to the work before it reaches said pre determined pressure point, a stud shaft and bushing carried by the Work en aging element; said stationary cam means having its free end bifurcated to engage the bushing. 11. In combination with a work engaging element, driving mechanism therefor, and a stationary element to receive and resist pressure from the work engaging element, a link having a slot provided in one end through which said driving mechanism freely travels independently of the link, a coupling member pivotally mounted on the link for couplingsaid link to the driving mechanism, by

' coupling member to coupling position when the path of the element is free.

'12. In combination with a work engaging element and driving mechanism; means to connect said driving means and element comprising a rigid link and a coupling member, said coupling member bein pivotally mounted on the link and mova le to and from a coupling position of direct coupling engagement with the driving mechanism, and means to actuate the coupling member into engagement with the driving mecha nism whereby to render the link operative to exert pressure upon the element when its path is" free and to render the link inoperative when the element encounters an obstruc- 1 tion in its path extraneous to the work.

In testimony whereof I afiix my signature in presence of two witnesses.

' CHARLES F. ROOT. Witnesses:

.JOHN H. Coss,

PEARL M. YUNCHER.

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