US1951839A - Riveting device - Google Patents

Description

March 20, 1934. E J v s 1,951,839

RIVETING DEVICE Filed Feb. 15, 1932 INVENTOR Z777!!! 2 11 6115 %;MA W

ATTORNEY 5 Patented Mar. 20, 1934 RIVETING DEVICE Elmer J. Rivers, Farmingdalc, N. Y., assignor, by mesne assignments, to Curtiss Aeroplane 85 Motor Company, Inc.

Application February 15, 1932, Serial No. 592,958

1 Claim.

This invention relates in general to riveting devices and more particularly to one which may be suitable for applying rivets to tubular members to effect a fastening thereof.

It is an object of this invention to provide such a device that will squeeze hollow rivets after they have been inserted through two or more tubular members desired to be connected without causing any damage to the tubular members themselves.

It is a further object to provide such a device that will make for ready alignment of the squeezing elements with the rivet so as to insure ease and speed of operation.

It is a further object to provide such a device that will allow for operation by outside mechanical devices such as air hammers, by which the pressure may be applied to the squeezing element without the usual manual effort.

It is a still further object to dampen the pressure of the hammer squeezing element within its predetermined limits of movement so as to minimize the likelihood of breakage of the rivets themselves during the squeezing process.

With the foregoing and other objects in view, the invention consists in the combination of parts and in the details of construction hereinafter set forth in the following specification and appended claim, certain embodiments thereof being illustrated in the accompanying drawing, in which:

Figure 1 is a view in side elevation partly in section of the riveting device with the tubular elements and rivet in place prior to the squeezing of the rivet;

Figure 2 is a detail view similar to Figure 1, showing a portion of that shown in Figure 1;

Figure 3 is a view similar to Figure 2 showing the position of the elements during the rivet squeezing operation;

Figure 4 is a top plan View of the device.

Referring more particularly to the drawing, the device consists of a heavy casting with a base 1, a body 2 and an upright 3, the latter being bored at 3' to slidably receive a compound sliding plunger. This plunger may consist 'of a bar of such dimensions that its lower part 4 will slide in the bore 3'. The upper part 4 may be of the same or any size or shape, the two portions being separated by spaced circular flanges 5 and '6. Flange 5 constitutes a stop for limiting the downward movement of the bar which is effected when flange 5 strikes the base 3, and flange 6 provides a convenient means for keeping the flange 5 unseated from the top of the upright 3 through the action of a suitable spring which is attached to the support 2 so as to force the plunger upwardly by exerting an upward force on flange 6, one end of the spring 7 being arranged around the plunger 4' between the flanges 5 and 6 such as shown at 7. Flange 5 may either be integral or otherwise secured so as to make it adjustable.

Either integral with bar 4 or adjustable in relation thereto is secured a bar 8 of smaller diameter which has either integral therewith or detachably secured thereto a tip with a concave surface 9 and a centrally disposed tit 10. Surrounding the bar 8 is a sleeve 11, one side of which is recessed at 12 to receive a pin 13 carried by the bar 8 so as to limit the downwardmovement of the sleeve with relation to the bar. A compression coil spring 1% is arranged around the bar 8 and between the bar 4 and the sleeve 11, tending to force the latter downward against 15 the stop pin 13.

On the base 1 is detachably secured a button 15 which may have a centrally disposed tit 16. At 1'7 there is represented a tubular member such as a diagonal airplane wing rib bracing element, while at 19 there is represented another tubular member such as a rib frame chord member to which it is desired to'secure the diagonal member 17. To do this the latter is split at 18 and the two divided ends 17 flattened out. The frame chord 19 is then placed between these two ends after the ends and the frame chord have had holes punched through to receive the rivet. When these holes are aligned the rivet 20, which is hollow, is passed through and the assembly is then placed on the base so that the lower end of the rivet rests on the button 15 with the tit extending slightly into the hollow barrel of the rivet. The distance between the two tits 10 and 16 should be so gauged that when the tubes are placed on the button the upper tit should be in such relationship to the rivet that the flange 5 will stop any downward movement of the plunger assembly further than that needed to squeeze the rivet so that no pressure will be transmitted to the tubes which would cause damage thereto. The spring 7 by its upward pressure on flange 6 merely holds the plunger up out of the way so: that the tubes may be readily inserted for riveting. Pressure may be applied to the plunger assembly in any suitable manner but by the special nature of the device it has been found feasible and desirable to use an air hammer of the conventional type. There is represented at 21 a socket carried by a base 22 which leads to a source of air pressure. This socket may be merely slipped on the bar 4 whenever it is desired to squeeze the rivet. The rivet is preferably of the type having two Wall thicknesses, the thinner wall thickness being at the upper end of the rivet and having an extent substantially equal to that portion of the rivet which protrudes upwardly past the upper flattened tubular end 17' of member 17.

The entire arrangement makes for simplicity and speed of operation. The sleeve serves as a guide for the squeezing tit and the latter serves as a guide for the plunger which carries it. The sleeve itself is cushioned by the spring so that any contact of the sleeve with the tubes will not cause any damage to the latter as the flange 5 stops the plunger before the spring can be fully compressed. The sleeve surrounds the rivet head and the plunger and plunger tit cause the even distribution of the squeezing action on the rivet.

Having thus described my invention, I claim:

A riveting machine comprising a stationary frame, an assembly mounted for vertical reciprocation in said frame, said assembly comprising a vertically movable plunger having a reduced lower end upon which a sleeve is slidably mounted, said sleeve being urged downwardly by spring means between the sleeve and the upper, larger end of the plunger into a position in which the sleeve normally engages stop means, a flange on the upper end of the plunger adapted to engage the topmost surface of the frame to limit the extent of the downward movement of the plunger, and resilient means acting normally to lift the flange out of engagement with the frame.

ELMER J. RIVERS.

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