US1658151A - Guard for foot presses - Google Patents

Description

Feb. 7, 1928.

s. P. WYRFEL GUARD FOR FOOT PRESSES Filed March 26, 1925 3 Sheets-Sheet 1 l llllliiia null] millllll! INVENTOR Sam UEL. F! W/RFEL- Feb. 7, 1928.

S. P, WYRFEL GUARD FOR FOOT PRESSES Filed March 26, 1925 SSheets-Shee: 2

Feb. 7, 1928.

S. P. WYRFEL GUARD FOR FOOT PRESSES 3 Sheets-Sheet Filed March 26, 1925 INVENTOR 14m (JEL. i? WfiW-"EL A TTOHNE Y5 Patented Feb. 7, 192a.

B STATES 1P TEN OF 'F l C E SAMUEL P. WYRFEL, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE ARROW ELEC- -TRIO COMPANY, OF HARTFORD, CONNECTICUE A CORPORATION OF CONNECTICUT.

GUARD FOR FOOT PRESSES.

Application filed March 26, 1925. Serial No. 18,614.

My invention relates to guards for foot presses, and the object of my invention is to provide a guard which is not only certain of operation, but also readily applied to presses of standard construction.

In the accompanying drawings Fig. 1 is a side elevation of a foot press to which is applied a guard in which my in vention is embodied in one form;

Fig. 2 is a similar view showing the parts in another position; and

Fig. 8 is a front elevation of the press in the position shown in Fig. 1.

The press illustrated is of conventional type, with work table 15, supported by legs 16, press base 17 on the table and standard 18 rising from the base. Pivoted at 19 in the standard is the toot-operated lever 2O which, as it swings backward, depresses the vertically reciprocating tool carrier '21 guided in the standard. The tool 22 operates on the blank 23 (Fig. .2) positioned by the operatives hand 24 on the anvil 25 arranged on the base 17 below the tool 22.

The guard mechanism to which my invention relates, comprises a yoke 26, the legs of which straddle the tool 22 and anvil 25 and embrace the standard 18 to which they are pivoted at 27. A shield 28 pivoted at 29 to the yoke legs adjacentthe head of the yoke, is connected adjacent its upper margin by link rod 30 to a pivot pin 31 on the standard and is thus caused to swing toward the tool 22 as the yoke 26 descends with the tool toward the base 17 This inward swing ofthe shield 28 brings its upper margin suflici'ently close to the tool carrier 21 to prevent the insertion of the operato-rs fingers above the shield into the space between the tool 22 and anvil 25 as the tool descends. The set screw 32 by which the tool 22 is secured in the slide 21 is accommodated by the notch 33 (Fig. 3) in the shield as the tool 'descends.

The swing of the guard with tool slide 21 is efiected by an adjustable lost motion connection between these parts. For this purose I have shown a bracket 84 and brace 35 both bolted to the slide and supporting a rod 86 threaded at its upper end to receive nuts by which it is adjustably attached to the eye 37 on the bracket 34. At its lower end the rod passes through a pivoted stud 38 on the yoke 26 and is provided with a head 39 which underlies the stud. Between the bracket 34 and the stud 38 is confined under slight stress a coil spring 10. It is thus obvious that while a positive lifting connection between the slide :21 and the yoke 26 is afforded by the headed rod 36, the downward thrust connection is .not positive, but yielding through the spring 40.

Inasmuch as the downward movement of the guard with the tool slide is not positive, some means should be provided to prevent the tool 22 from approaching the anvil 25 if the guard is not in obstructing position-as for example when the operator attempts to hold the work on the anvil as the tool de dicated in Fig. 2, by the hand 24 of the op-' erator, the link ll halts the stop lever 4-2 in such position that the forward margin of the stop plate lies in the path or" the stop pin 47, with the result that the full stroke of the toot lever is halted before the tool 22 is brought suiiiciently close to the anvil 25 to injure the operators Ii the latter are withdrawn, so that the guard now moves down under the influence of the spring 40, the lever swings the stop plate 45 out of obstructing position and the foot lever 20 may continue its operating stroke. As itmoves backward, the stop 47 then passes beneath the tail 46 of the stop plate l- 5 (Fig. 1, dotted lines) and prevents the operator from lifting the guard, after the stop plate 45 is cleared by the stop pin 47, toagain insert the fingers.- The device is thus rendered fool proof.

The guard mechanism is simple, effective, and readily applied, with slightvariations, to foot presses of different makes. The con struction illustrated has been used with satisfactory results, but modifications will readily occur to those dealing with this problem, which do not depart from what I claim as my invention.

I claim I 1. In a machine of the character described, a vertically reciprocating tool, a fixed bed with which it cooperates, a lever for operating the tool, in combination with a pivoted guard having a lost motion connection with the tool for movement therewith in both directions, a stop member on the tool-operating lever, and a'cooperating stop member positively connected to the guard and moved out of obstructing position to permit completion ot the working stroke of the lever only when the guard assun'ies protective posi 'tion.

2. In a machine of the character described, a vertically reciprocating tool, a fixed bed with which it cooperates, a lever for operating the tool, in combination with a pivoted guard directly connected with re silient lost motion to the tool or movement therewith iii-both directions, a stop member on the tool-operating lever, and a coopcrat-' for operating the tool, in combination with a pivoted guard directly connected with the 139 tool for n'iovement therewith in both directions, a stop FflCiTllJQI' on the tool-op "ating lever, and a cooperating stop inen'iber positively connected to the guard and moved out of obstructing position to permit coinpletion of the working stroke of the lever only when the guard assumes protective position, said stop members cooperating to prevent lifting of the guard to non-protective position after the lever is freed to complete its working stroke. 7

4. In a foot press, a standard, a tool carricr reciprocating therein, a fixed bed plate above which the tool carrier Works, a finger guard pivoted on the standard, operating means directly connecting the tool carrier to the guard for swinging the latter with the tool, a pivoted operating lever for reciprocating the tool carrier, a rocking stop lever, 21 positive connection between the latter and the guard, and cooperating stop elements on the stop lever and operating lever so related that in non-protective position of the guard the operating lever is restrained from a complete working stroke, while the guard when in protective position, is restrained from dis placement there'l'rom as the operating lever completes its working stroke.

5. in a foot press, a standard, tool carrier reciprocating therein, a fixed bed plate above which the tool carrier works, a finger guard. pivoted on the standard, a bracket secured directly to the tool carrier, an operating connection between said bracket and pivoted guard for causing the latter to follow the vertical reciprocation of the tool carrier, a pivoted lever for reciprocating the tool carrier, a rocking stop lever, a positive connection between the latter and the guard, and cooperating stop elements on the stop lever and operating lever, such stop elements com-- prising a stop lug rigid withthe operating lever and a stop memberat one end of the rocking stop lever, said stop member having a shoulder which lies in the path of the stop lug on the operating lever only when the guard is in non-protecting position, said stop member having an extension or tail overlying the stop lug on the operating lever and serving to prevent lifting of the guard to SAMUEL r. wvnrnn

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