US1875527A

US1875527A - Press guard

Info

Publication number: US1875527A
Authority: US
Publication date: 1932-09-06
Anticipated expiration: 1949-09-06

Description

Sept. 6, 193; J. P; UDAL 1,875,527

PRESS GUARD Filed April 1, 1931 2 Sheets-Sheet l Se t. 6 1932.

P J. P. UDAL 1,875,527

PRESS GUARD Filed April 1, 1951 2 Sheets-Sheet 2 Patented Sept. 6, 1932 UNITED STATES JOHN .POUNTNEY UDAL, or sELLYrARx, BIRMINGHAM, ENGLAND PRESS GtIARD 7 Applicationfiled April 1, 1931, Serial No. 526,942, and in Great Britain May 29, 1930,

This invention relates to the hand guards employed in combination with such machines as presses, stamps, hammers and the like, and particularly the guards of the kind described and claimed in the specification of my previous U. S. Patent No. 1,545,929.

The object of the present invention is to provide an improved guard adapted for use more particularly with large presses. In

0 such machines it is desirable that the guard when in its inactive position shall occupy a position well above the space through which the operator feeds the work pieces to the tools. By the present invention I am able to satisfy this condition in a very simple and convenient manner, and, at the same time,

retain the advantageous features of my prestriking member Z. The upper end of one of y the levers j is extended, and to this extension viously patented guard. The essential features of my former guard comprise a pair of lever systems one of which is pivoted on the other. One of the lever systems is pivoted on a stationary part of machine, and the other which carries the hand striking member is connected to a convenient 5 part of the machine by a link or other con-,

straining means. Motion is imparted from any convenient part of the machine to the lever system pivoted on a stationary part of the machine.

The present invention comprises the pivoting of one of the lever systems on the mov-' able plunger or like part of the machine, and the connecting of this lever system to a stationary part of the machine through the medium of a pivotal link, or an equivalent actuating connection. In the two accompanying sheets of explanatory drawings c Figure 1 is a front elevation and Figure 2 40 an end elevation showing in, the inner position a press guard constructed in accordance with this invention. 7

Figure 3 is an end view showing the guard in the outer or extended position.

In carrying the invention into effect as shown I carry by means of brackets a on.

the plunger 7) of the press or other suitable moving part of the machine, a cross-shaft 0 to which are secured a pair of levers d. These levers may be interconnected by cross rods e, and they form the first of-the two lever systems of myguard. To one end-of the same crossesha-ft-cthere is secured anv other lever f, the freeend .of which is con; nected by 11183 .13 ofa pivoted link 9 to a bracket [1. ona convenient stationary part of the machineglt will be apparent that re-- ciproc ationof the plunger-f, and,-consequently, ofv the-cross-shaftc carrying the first lever system, will be accompanied by oscillation of the lever system d relati-vely to the front of the machine. Atthe lower, end-of the first; lever system] all there is provided another cross-shaft z which carries another pair of levers j forming the second lever system. These levers are interconnected by cross bars is, and at their lower end they carry a hand there is pivotally attached another link m serving as a constraint, this link being also connected to a swivel piece a pivoted on one s of the brackets a.

When the plunger is in its upper position the whole of the guard mechanism occupies an inner position well above the s ace 0 through which the work pieces are ed between the upper and lower tools respectively carried on the plunger?) and base 10 of the machine as shown in Figures 1 and 2. During the descent of the plunger and in the initial part of such movement the first lever system 03 is caused toswing outwards, and by this action a rapid swinging movement is given to the second lever system j whereby the hand striking member Z not only descends with the plunger, but also moves rapidly in the outward direction towards the operator as shown in Figure 3. Should the operators hand or arms be in a dangerous position during this movement of the plunger they will be caught by the hand striking member and I moved in a forward direction clear of the descending tool.

The invention is not limited to the example above described nor to any particular subordinate constructional or. mechanical features, but inall cases the first lever system is pivoted on the plunger or like part of the machine, and the guard receives its motion directly from that part. Thus, instead of connecting the upper guard portion to the fixed part of the machine by a link 9, any other suitable connection may be employed whereby the relative movement of the plunger and the stationary part of the machine-can be utilized to produce the required swinging of the guard.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is A press guard for a power press havinga reciprocating plunger comprising brackets on said plunger, a cross-shaft mounted on said brackets, a primary guard member mounted on said cross-shaft,a lever attached to said cross-shaft, alink pivotally attached to said lever and a stationary part of the press, a second guard member pivoted on the primary guard and provided at its lower end with a hand striking member, an extension on said secondary guard member and a link having one end pivotedto said extension and the other end pivotally mounted on one of said brackets.

In testimony whereof I, have signed my name to this specification.

JOHN POUNTNEY'UDAL.