US1573430A - Printing-plate holder - Google Patents

Description

Feb. 16 1926. 1,573,430

E. E. THIEL PRINTING PLATE HOLDER Filed August 22, 1924 ATTOR/Vfyj,

Patented Feb. I6, 1926).

UNETE STATES PATENT OFFICE.

EMIL E. THIEL, OF CINCINNATI, OEIO, ASSIGNOR TO THE PRINTING MACHINERY COMPANY, OF CINCINNATI, OHIO, A. CORPORATION OF OHIO.

PRINTING-PLATE HOLDER.

Application filed. August 22, 1924. Serial No. 733,6e5.

To all whom it may concern:

Be it known-that I, EMIL E. Trust, a citizen of the United States, and a resident of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Printing- Plate Holders, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing, forming part of this specification.

My invention relates to devices adapted for use with a bed, for retaining printing plates and the like thereon. It further relates more particularly to such devices where used with printing plate beds having numerous holes therein, into which the devices of my invention are dropped.

Drop-in hooks as such devices are termed commercially, usually comprise a jaw, and a holder, the latter being adapted for dropping into the holes or channels in a printing plate bed, and some kind of means resulting in the operator being able to adjust the position of the parts so as to bring the jaw up against a printing plate thereby holding the plate down on the bed, and also holding it against displacement in the plane of the bed.

It is the object of my invention to provide a structure wherein the carrier is fixed, and the jaw movable, and in which the jaw is 7 given its movement by a double acting mom-- her which imparts very rapid action, and at the same time imparts a thrust to the jaw, and which is of self-locking type. More particularly it is my object to employ a right and left hand screw which is in engagement with the jaw and the carrier in right and left hand threaded sockets, so that a turning of the screw will give a double movement, with threads of a pitch in the screw which will not permit any jogging loose thereof, when under stress. It is further my object to provide for a simple sturdy structure of aw and carrier with small number of parts and easy assembly and operation.

I accomplish my objects by that certain construction and arrangement of parts to v be hereinafter more specifically pointed out and claimed.

In the drawing:

Figure 1 is a top plan view of one of the devices located in a press bed.

the lower ends thereof, to provide a shoul-.

der for engagement with a hold-down tongue or projection on the carrier portion of the device.

The carrier is formed with base l and two upright sides 5, 5, with the base projecting from what may be termed the forward edges of the sides in a tongue 6. The proportions of the carrier are such that it may be tipped lnto the holes in the press bed, and then straightened up in such a way that the tongue will lie under the shoulder in the base of the bed hole, and the carrier, as will be noted, holds the jaw between the uprights so that when the jaw is pressed against a plate, the carrier can not be tilted out reversely to the manner of its insertion. Thus the carrier will not become dislodged when the jaw is in operation, but at other times can be tilted in and out of the holes, at will.

The uprights of the carrier are provided with holes 7 for a pivot pin 7, and holes 8 for a pivot pin 8.

The jaw is formed with the usual head 9, and a stem 10, which fits snugly between the uprights of the carrier, and has a screw socket 11 therein, communicating with a hole 12 that opens into the top of the jaw. The socket is formed with a left hand thread. The stem has also a leg 13 which is secured by the pivot pin 7 in pivotal relation with the forward edges of the uprights.

Mounted on the other pivot pin 8, is a bearing block 14, which has a screw socket therein as at 15, same being right hand threaded. A screw 16 having a left hand threaded portion for engagement in the stem, and a right hand portion for engagement in the bearing block, is set into said respective parts.

The entire device is thus formed of a and a right and left hand screw, which is a very simple structure and easy to put together.

In operation the device is dropped into a press bed hole and a tool inserted to engage the squared socket 17 in the upper end of the screw, the tool passing through the hole 12. v

The jaw will then be thrust either forward or retracted dependent upon how. the screw is turned, and will be moved very rapidly into or out of engagement with a printing plate to be held on the bed. The direction of thethrust is such as to insure a tight engagement of the back of the carrier with the'hole in the bed, when the jaw is in engagement with the plate. Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a device of the character described,

the combination of a carrier, a bearing block mounted on the carrier, and a jaw, means for plvotally mounting the aw 1n the car- .rier and a screw intermediate the jaw and bearing block, said screw having right and left handthreads, and the bearingblock and jaw having right and left hand threaded sockets to engage said screw, said screw being so placed that turning thereof moves the aw withrelation to the carrier.

2. In a device of the character described, the combination with a carrier having a base, and interspaced sides. a bearing block, and a jaw, each being pivotally mounted in the carrier, a right and left hand screw available for turning through the jaw, and right and left hand sockets in the jaw and the bearing block for said screw, for the purpose described.

3. In a device of the character described, the combination of a carrier having a base, and upright sides, a jaw having a threaded socket therein, opening through the top of the jaw, a pivoted bearing block in the carrier, means for movably mounting the jaw in the carrier, and said bearing block having a threaded socket for an adjusting screw, said two threaded sockets being right and left threaded respectively, and an adjusting screw having a right and a left hand threaded portion set into said two sockets, for the purpose described.

EMIL E. THIEL.

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