US1196721A - Safety device. - Google Patents

Description

C. F. ROOT.

-S AFETY DEVICE. I V I APPLlCA TION FILED NOV; 24. 1914. 1,119,?1... Patented Aug. 29, 1916.

3 SHEETS-SHELT I.

WITNESSES [NI/EN TOR BY v 4%; Alfoy y C. F. ROOT. SAFETYgPEVICE. APPLICATION FILED NOV=24.1914.

Patented Aug. 29, 1916.

g g BY WITNESSES Afforuey C.F.R00T. SAFETY DEVICE.

APPLICATION FILED NQV 24. I914.

Patented Aug. 29, 1916.

[NVENTOR 3 SHEETS-SHEET 3.

WITNESSES CHARLES F. BOOT, OF RAVENNA, OHIO, ASSIG'NOB OF SHE-FOURTH TO BYRON 0.

CONN, OF MANSFIELD, OHIO.

SAFETY DEVICE.

manner.

Specification of Letters Patent.

Patented enters.

Application filed November 564, 19%. Serial No. 873,778.

element that is adapted to exert a pressure upon work or the like which is interposed between said element and an opposing element. It is well known that the operator of a machine who is required to place work between and remove work from between a movable pressure element and an opposing element by hand manipulation is in great danger of being injured-by inadvertently orotherwise failing to remove thehands or ingers from between the elements in time to prevent the hands or fingers of the operator from being caught, pressed and crushed be tween said elements.

The primary object of my invention therefore is to provide means of insuring absolute safety to the operator of a machine of the class described although by inadvertence or otherwise the operators fingers or hands should be caught between the ele ments. I j

.My invention more specifically consists in employing a movable work engaging element that is normally operative to exert a pressure at a pre-determined point in its working movement; said pressure being preferably exerted upon the movable work engaging element just prior to contacting with and while it is acting upon work that is interposed or projected bet-ween the movableRvork engaging element and a resisting opposing element, and automatic means to render the movable work engaging clement inoperative to exert a pressure when. in its working movement it encounters an ()bStlllC- tion extraneous to the work which subjects it to pressure before it reaches the predetermined point at which it is operative to exert a pressure.

Another object of this invention is to provide machines of the class described with an automatic safety device that will prevent injury to the operator irrespective of the fact as to whether or not his mind is upon his work or diverted therefrom.

To accomplish these and other objects, a skeleton frame ismovably mounted upon the frame of a conventional type of job printing pressand a bed is pivotally mounted upon the skeleton frame connected thereto and adapted to move back and forth with reference to, independently of, and within the skeleton frame, means being provided to rigidly interlock the bed and skeleton frame thereby forcing them to move in unison to exert a'prcssure at a predetermined pointin their working movement and unlock them to permit independent movement of the bed with respect to the skeleton frame when the bed is subjected to pressure before it reaches the predetermined pressure point.

I attain these and other objects by the mechanism illustrated in the accompanying drawings, in which: I

Figure 1 is a side elevation of a convent'ional type of a job printing press showing my safety mechanism applied thereto and the bed and skeleton frame in locked position in dotted lines and in unlocked position in full lines. Fig. 2 is a side elevation .of the press showing the relative position of the bed, skeleton frame and safety mechanism whenthe bed is subjected to pressure or encounters an obstruction (to wit: the fingers or the hands of the operator) before it has reached a pie-determinedpoint in its working movement. Fig. 3 .is a, plan view of the press, the platen portion of the press being omitted. Fig. 4 is a rear elevation of the press. Fig. is a cross-sectional view of the elongated locking member taken on the line X X of Fig. Fig. (3 is a sectional elevation of-one of the disks of the press showing a separable cam carrying plate mounted thereon.

In the drawings, reference numerals l, 2 and 3 represent the framework of a con ventional type of a job press having the usual bed supper-tin shaft t mounted thereare pivot-ally supported thereon to move back and forth embraced Within the wings 7 and 7 of the skeleton frame. The skeleton frame is 'movably connected to the bed by pins 13 and 14 which are attached to the bed and project into and engage with the slots 15 and 16 formed in the wing portions 6 and 7 of the skeleton frame The bed 12 is provided with a rearwardly extending portion 17 and a shoulder 18 is formed thereon. An elongated locking member 19 is pivotally mounted upon the shaft 8 and its end 20 is adapted to be engaged with and disengaged from the shoulder 18 of the part 17. The driving shaft 21 has the ordinary disks 22 and 23 mounted thereon and movement is imparted to the skeleton frame through the medium of the usual connecting rods 24 and 25 which are connected to the crank pins 26 of the disks (one only being shown) and to the reduced portions 2.7 and 28 of the shaft 8. 4

An opposing element or platen 29 is secured to the press or machine in the path of.

the travel of the bed 12. Bearings30 and 31 are provided on the frame work members 1 and 2 and a rock shaft 32 is journaled therein and carries upon the end 33, which projects beyond the framework, a camlever 84 which s provided on its free end with an enlarged shouldered portlou 35.

A lever rod 36 having a bifurcated end 37 is secured to the rock shaft 32 substantially on a plane with-the cam lever 34 but projects'in theopposite direction, the bifurcated end 37 being located substantially underneath and in alinement with the ears 38 of the locking member 19.

A link 39 is pivotally connected on one end to the ears 38 of the locking member 19 by a pin 40 and its lower endis provided with a slot 41 and slidably connected to the bifurcated end 37 of the lever rod 36 by a pin 42. A spring 43 is connected to the lower end of the link 39 and is arranged and connected to the frame work to exert its tension to force the end 20 of the locking member into engagement with the shoulder 18 of the extending portion 17 (see Fig. 1 dotted lines A iilisk plate 44 having an annular flange 45 which is adapted to fit the periphery of the disk 22 is provided and is held in place on the disk 22 by the screw 46 and the crank pin 26 which passes through a suitable aperture formed in the disk plate. The enlarged shouldered end 35 of the cam lever is arranged to contact with the periphery of the disk plate and a cam 47 carried thereb The operation of the device hereinbefore described is as follows: When the disks 22 and 23 are rotated, a reciprocating movement is transmitted to the skeleton frame through the medium of the connecting rods 24 and 25. The bed 12 is pivotally supported on the skeleton frame and is adapted to move independent of the skeleton frame or in unison therewith. At a predetermined point after the bed commences to travel toward the platen or other opposing element, to wit: upon its working movement, as shown in full lines on Fig. 1, the end a of the cam 47 contacts with the enlarged end 35 of the cam lever 34 forcing the means connected to it and the locking member to exert .pressure upon the locking member to repassed (asit is rotated by the disk 22) beyond the enlarged portion 35 of the cam lever permitting it to move into contact with the periphery of the disk plate 0 and cam 47 (as shown in dotted lines) and the spring '43 is then permitted to exert its tension upon the link 39 thereby forcing the locking inculber to interlock with the bed (sec dotted line position of bed and skeleton frame Fig. 1). The bed and skeleton frame remain interlocked with each other while the bed is not- 1ng upon the work and during the time the bed and skeleton frame are traveling on their non-working movement and are unlocked from each other whenthe end (L of the cam in its rotation again contacts with and exerts pressure upon the enlarged portion 35 of the cam lever thereby operating the means thatconnects the cam lever to the locking member and releasing the locking member from its engagement with the bed.

The above describes the operation of my safety device when the machine is operating normally and the path of the parts free. If, however, an obstruction such as the finger 48 (see Fig. 2) of the operator is inadvertently interposed or otherwise projected between the bed and platen or other opposing element, or if the bed is subjected to pres sure at any time before it reaches, in. its travel upon its working movement. a predetermined point and is locked with the skeleton frame to exert a pressure upon the platen or opposing element, thebed will be arrested and idle but the skeleton frame will be permitted to continue its movement independent of the bed, the slots 6 and 7 forming a clearance for the pins 13 and 14. The connecting means of the locking member yields to accommodate the movement of the 1 skeleton frame as the slot 41 in the link 39 7 caused by an obstruction between it and an oparsenal posing element (or otherwise) the bed 12 falls forward by gravity until it is stopped .by the pins 13 and 14. coming in contact with the ends of the walls of the slots 6 and 7. The skeleton frame and the bed are then in such 'a relative position with reference to each other as to permit the locking member to interlock with the bed provided that the cam lever is not in contact with the cam. The end 20 of the locking member, when disengaged from the bed and the bed is subjected to pressurebefore it reaches a predetermined-point in its working stroke, passes over the top of the shoulder portion 18, as shown in Fig. 2, dotted lines. The bed is hung or mounted upon the skeleton frame in such a manner as to throw its gravity forward of the axis of the shaft 9 when the bed is traveling upon its working movement, thereby keeping the bed and skeleton frame in the same relation to each other Whether interlocked with or disengaged from each other as the pins 13 and Lt contact with the end alls of the slots 6 and 7 limiting the beds forward movement in relation to vthe skeleton frame.

Attention is called to the fact that by changing the position of the cam on the periphery of the disk 22 or by varying its length, the locking member can be forced to interlock the bed and skeleton frame and to unlockthem at different or predetermined points in their working movement. v

Thedrawings show a separable disk plate fitted to one of the ordinary disks of a job printing press but it will be obvious to those skilled in the art that the cam a? can be attached to the disk if desired without departing from the principle of my invention.

The rotation of the disks22 and 23 is toward the front of the. press.

What is claimed is:

1. In a safety device for machines provided with a movable multi part Work engaging element, one of said parts being pivotally mounted upon and carried by the other for independent movement relative to each other, and an opposing element, means to cause the movable element to exert a pressure ata pre-determined point in its working stroke upon work projected between said elements, and automatic means to permit said movable-element to yield when the movable element in its working movement is subjected to pressure before it reaches in its travel said predetermined point. I

2. In a safety device for machines provided with a skeleton frame having a movable work engaging element, pivotally mounted thereon, an opposing element, means to cause the movable element to exert a pressure at a, predetermined point in its working stroke upon work promoted between said elements, and automatic means interlocking means to lock and unlock said elements:

l, In a safety device for machines equipped with a work engaging pressure clement composed of a plurality of parts, one of said parts being pivotally mounted upon and carried by the other for independent movement relative to.each other, and an opposing element which is adapted to resist pressure from the work engaging element, means to permit the pressure element to yield upon being resisted by the opposing element, and means to cause the work engaging element to exert a pressure upon the opposing element at a predetermined point in its working movement.

5. In a safety device for printing presses, a frame, a skeleton frame pivotally mounted on said frame, a bed pivotally mounted on said skeleton frame, means to interlock said skeleton frame and bed for movement in unison andrmea'ns'to'operate said locking means to unlock said bed and skeleton frame to permit the bed to move independently of the skeleton frame when the bed is subjected to pressure before it reaches a predetermined point in its working mo'vement.

6. In a machine of the type set forth,-a

work engaging element composed of two movably related parts, driving means connected to one of the parts, means connected to said part to engage and lock the other part thereto, and cam controlled means for actuating the locking means whereby to render the locking means operative when said other part has traveled a predetermined distance toward the work.

7. in a safety device for printing presses:

each other, means to interlock said moving element at predetermined points in its working movement, and means 'to permit said movable element to yield when subjected to pressure before it reaches said predetermined point.

8. in a safety device for machines of the class described, a movable frame, a bed piv-v otally mounted upon and carried by said frame, means to rigidly interlock the frame and bed, and means to operate the interlocking means to permit the bed to yield independent of the movement of the skeleton frame upon encountering an obstruction in its path.

9. In a safety device for machines of the class described comprising a frame work, a skeleton movable frame mounted thereon, a bed pivotally mounted upon said skeleton frame and adapted to move with and yield independent of the movement of said skeleton frame, an opposing element, means to interlock said bed and skeleton frame to exert a pressure upon work projected between the bed and opposing element, and means to operate the interlocking means to permit the bed to yield upon encountering an obstruction in its working movement before it is interlocked for pressure.

10. In a safety-device for machines of the class described, a frame, a skeleton frame pivotally mounted upon said frame, driving means carrying a cam and having suitable connections to impart movement to said skeleton frame, a bed embraced Within the skeleton frame and engageable therewith to have independent movement with relation thereto, a locking member, and means connected to the locking member and actuated by the cam to automatically interlock and unlock said skeleton frame and bed at predetermined points.

11. In a safety device for machines of the class described, a frame, a multi-part movable element pivotally. mounted on the frame, both being adapted to move in'unison and independent of each other, an opposing element, means to interlock the mult1- part movable element for exerting a. pressure upon the opposing element, and means to operate the interlocking means to automatically prevent pressure from being exerted upon the opposing element by the multi-part element when it encounters an obstruction at a predetermined point in its working movement.

12. In a safety device, a pivoted frame member, a second member pivoted to the first frame member for independent movement in relation thereto and having a work ,engagingelement, means to engage the see 0nd member if? prevent pivotal movement thereof, locking mcans to reciprocate the first member, and means actuated by said reciprocating means to operate .l'the locking means to lockthe second member to the first member.

13. In a safety device, a pivoted frame free, said bed when the path thereof is oblock the work engaging element to the driver element, and cam means operated by the driving means for rendering the locking means operative when said work engaging element has traveled a predetermined dis tance toward the work.

15. In a safety device, a pivoted frame member, a pivoted work engaging element borne by said frame member, means to lock the element against movement relative to the frame member when the path of the element to the work is free, and means to allow the frame member to complete its movement independent of the element when the latter engages an obstruction extraneous to the work.

16. In a safety device for machines of the class described, a frame, a bed pivotally mounted upon and carried by said frame, locking means to rigidly connect the frame and bed, and means to' operate the locking means to permit the bed to yield independent of the movement of the frame upon encountering an obstruction in its path.

17. In a safetydevice for machines of the class described, a frame, a member pivoted thereto, automatic means to rigidly lock the pivoted member to the frame and means to operate the locking means to unlockthe pivoted member from the frame thereby permitting it to yield when subjected to pressure.

18. In a machine of the type set forth, a bed for engaging the work, a driver for the bed movably associated therewith, driving means for the driver, means to lock the bed to the driver, and cam means operated by the driving means for rendering the locking means operative, when the bed has traveled a'predetermined distance toward the work.

19. In combination with a bed and a driverpivotally connected thereto, means for driving the driver, means carried by the driver to engage the bed to cause the bed and driver to' move in unison, means to actuate the second named means, and a cam operated by the driving means to actuate said second named means when the bed has traveled a predetermined distance toward the work.

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

' CHARLES F. ROOT.

Witnesses:

JOHN H. Coss, PEARL'M. YUNCHER.

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