US2216767A

US2216767A - Riveting tool

Info

Publication number: US2216767A
Application number: US221636A
Authority: US
Inventors: Sergo B Davitow
Original assignee: Individual
Current assignee: Individual
Priority date: 1938-07-27
Filing date: 1938-07-27
Publication date: 1940-10-08
Anticipated expiration: 1957-10-08

Description

Oct. 8, 1940.

S. B. DAVITOW RIVETING TOOL Filed July 27. 1938 INVENTOR SERGO B. DAVITOW. BY

ATTORNEY Patented Oct. 8, 1940 UNITED STATES RIVETING TOOL Serge B. Davitow, St. Albans, N. Y.

Application July 27, 1938, Serial No. 221,636

7 Claims.

(Granted under the act of March 3, 1883, as amended April 30, 1928; 370 O. G. 757) of the barrel ll between a pair of upstanding This invention relates to a riveting tool and has Jfor an object to provide an easily operable tool for expanding a hollow rivet which has been placed through two pieces of sheet material to secure the pieces of sheet material together. It .is especially intended for use in cases where the sheet material is metal and where the ends of the sheet material are not suiiiciently accessible to allow the tool to overlap one of the ends.

A further object of this invention is to provide a riveting tool which is hand operated and in which the operating handles are mounted as a pair of levers pivoted one upon the other and adapted to be closed toward one another during the riveting operation in the same manner that the handles of a pair of pincers are operated.

A further object of this invention is to provide a hand operated riveting tool which can exert a powerful leverage to positively operate the riveting mechanism of the tool.

With the foregoing and other objects in view, the invention consists in the construction, combination and arrangement of parts hereinafter described and illustrated in the drawing, in which, 7

Fig. l is a partly sectional and partly elevational view of the riveting tool of this invention in closed position.

Fig. 2 is a fragmentary elevational view of the riveting tool in open position.

Fig. .3 is a sectional view, similar to Fig. 2.

Fig. 4 is a sectional view on line 4-4 of Fig. 2.

'Fig. 5 is an end View of the riveting end of the tool, and

Fig. 6 is a sectional view on line 66 of Fig. 2.

There is shown at ID the riveting tool of this invention which includes a hollow handle lever II to which is pivoted at l2 another hollow handle lever I3. Stopper members It and I5, welded or otherwise secured to the levers II and I3, limit the approach of the levers H and I3 to each other about their pivot l2. The end of the lever H is ofiset as at 16 and carries thereon a squared barrel ll which .is in axial alignment with the lever l3 when the lever 13 is closed against lever H. This barrel terminates in a .nozzle is. Slidable within the squared barrel I l is a squared piston 48 which may be pulled through the open end IQ of the barrel H by means of a pair of link arms 20 which are pivoted at 21 to the handle lever l3, as shown.

The other end of the squared piston 18 is bifurcated as shown at 22, permitting a mandrel puller bottom jaw .23 to be secured between the bifurcations as at 2 4. Pivoted above the jaw 23, at 2:5, is a mandrel grip lever 2:6 provided with a cammed upper surface 27. The free end of the grip lever 28 presses against a compression spring 28 sunk within a well 29 formed within the squared piston 18. Journaled above the rear end ears 3% is .a lever roller 31, the roller or abutment 3i being mounted over the end of a longituclinal slot 32 along the center of the top of the squared barrel l I through which the cammed surface Z 'l of the grip lever 26 may extend. A mandrel 33 consisting of a rod having an enlarged head 34 is adapted to be placed through the hollow rivet 35 and through the nozzle l8 to a position between the serrations 36 on the bottom jaw 23 and the serrations 3'! on the grip lever 26.

In operation, the sheets of material 38 and 39 being riveted together have the hollow rivet 35 placed therethrough in appropriate apertures previously formed therein. Mandrel 33 is then placed through the hollow rivet 35 until the head 34 abuts the end. of the rivet. the mandrel 33 is extended through the .nozzle !8' into position between the serrations 36 and 3l-on the jaw 23 and lever '26 while the handles I i and 13 are spread apart,--thereby permitting the spring 28 to raise the lever 26 about its eccentric pivot 25, spacing the serrations sufliciently distant to permit the mandrel to enter therebetween. Movement of the handles II and I3 toward each other through links 2!) draws the piston it partly through the opening 19 and causes the vcammed surface 21 of lever to pass under the lever roller 31 and pivot the serrations .31 to tightly grip the mandrel 33 against the serrations 36 of the bottom jaw 23. Further approach of the handle 13 to the handle H pulls the complete assembly rearwardly, causing the head 34 of the mandrel 33 to approach the nozzle t8 and thus expand the rivet to the riveted position .shown at til, the stops l4 and i5 limiting the approach of the levers H and [3 to the proper distance so that the movement of the mandrel head 34 is stopped when the rivet 35 has been properly expanded to the position Ml. Moving the handle levers I! and I3 apart reverses the operation in pushing the mandrel 33 partly out of the now emanded rivet 40, allowing the mandrel 33 to be withdrawn and replaced in a new rivet for further operation. Alternately, the mandrel .33 may be .an inexpensive nail of suitable size, which may be discarded and replaced at each riveting operation.

It will be noted from Fig. 1 of the drawing that when the handles II and I3 approach their closed position, that because of the leverage, the pull exerted on the mandrel 33 is very great. The purpose of this arrangement is not only to provide the required pulling force on the mandrel 33 to effect the desired expanding of the rivet, but also, if desired, when 'using a mandrel "having a tapered head shown in the drawing to pull the head *Mx-of-the mandrel entirely through the rivet opening. The mandrel head which is In this position slightly deformed in this operation serves to expand the shank of the rivet sufiiciently to form a secure fastening.

Other modifications and changes in the proportions and arrangements of the parts may be made by those skilled in the art without departing from the nature of the invention, within the scope of what is hereinafter claimed.

The invention described herein may be manufactured and used'by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.

Having thus set forth and disclosed the nature of this invention, what is claimed is:

1. A riveting tool for pulling a mandrel having a body portion adapted to pass through a hollow rivet having a head at one end and being headless at the other end, which headless end is to be expanded into an out-turned flange by a head portion on the mandrel larger than the hollow rivet and being adapted to expand the headless end portion of the rivet when the mandrel is pulled into the rivet while maintaining the head of the rivet stationary relative to the tool, said tool comprising means for engaging the body portion of the mandrel for pulling the same into the rivet comprising a barrel, a piston movable Within said barrel, a serrated jaw fixed in said piston, a cammed serrated jaw eccentrically pivoted in said piston, means for pulling said piston out of said barrel and other means for simultaneously camming said cammed jaw into engagement with said mandrel body to thereby expand the rivet.

2. A riveting tool for pulling a mandrel having a body portion adapted to pass through a hollow rivet having a head at one end and being headless at the other end, which headless end is to be expanded into an out-turned flange by a head portion on the mandrel larger than the hollow rivet and being adapted to expand the headless end portion of the rivet when the mandrel is pulled into the rivet while maintaining the head of the rivet stationary relative to the tool, said tool comprising means for engaging the body portion of the mandrel for pulling the same into the rivet comprising a barrel, a piston movable within said barrel, a serrated jaw fixed in said piston, a cammed serrated jaw eccentrically pivoted in said piston, means for pulling said piston out of said barrel and other means for simultaneously camming said cammed jaw into engagement with said mandrel body to thereby expand the rivet, said. pulling means comprising a handle lever on which said barrel is mounted, a second handle lever pivoted to said first handle lever, and means linking said piston to said second handle lever.

3. A riveting tool for pulling a mandrel having a body portion adapted to pass through a hollow rivet having a head at one end and being headless at the other end, which headless end is to be expanded into an out-turned flange by a head portion on the mandrel larger than the hollow rivet and being adapted to expand the headless end portion of the rivet when the mandrel is pulled into the rivet while maintaining the head of the rivet stationary relative to the tool, said tool comprising means for engaging the body portion of the mandrel for pulling the same into the rivet comprising a barrel, a piston movable within said barrel, a serrated jaw fixed in said piston, a cammed serrated jaw eccentrically pivoted in said piston, means for pulling said piston out of said barrel and other means for simultaneously camming said cammed jaw into engagement with said mandrel body to thereby expand the rivet, said pulling means comprising a handle lever on which said barrel is mounted, a second handle lever pivoted to said first handle lever, means linking said piston to said second handle lever, and a cam cooperating roller journaled on said barrel in the path of said cammed lever adapted to press and hold said cammed lever in mandrel gripping and holding position as the piston is drawn along under the roller.

4. In a device for aflixing a tubular rivet by drawing a mandrel through it, said mandrel being formed as a rod with an enlarged head adapted to upset a headless end of a rivet to afilx it, a casing, an axially sliding member supported by said casing and having a fixed clamping wall and a clamping part, means operating on sliding movement of said member to cause said part to engage said mandrel and to clamp the mandrel against said wall, means to disengage said mandrel to release the same, a handle fixed to said casing, a second handle mounted in pivotal relation to the first named handle, and a connection between said second named handle and said member for sliding said member.

5. In a device for affixing a tubular rivet by drawing a mandrel through it, said mandrel having an enlarged head adapted to upset the headless end of the rivet to affix it, an axially reciprocating member having mandrel clamping jaws, means to cause the jaws to grip the mandrel during the sliding movement of the member in one direction and to hold the mandrel gripped while it is moved into clamping affixing engagement with the rivet and on movement in the other direction to maintain the gripipng engagement with the mandrel, and means operating after a predetermined movement of said member in said other direction to release said mandrel for withdrawal from the device.

6. In a device for afiixing a tubular rivet by drawing a mandrel through it, said mandrel having an enlarged head adapted to upset the headless end of the rivet to alflx it, an axially reciprocating member having mandrel clamping jaws, means to cause the jaws to grip the mandrel during the sliding movement of the member in one direction and to hold the mandrel gripped while it is moved into clamping aflixing engagement with the rivet and on movement in the other direction to maintain the gripping engagement with the mandrel, and resilient means operating after a predetermined movement of said member in said other direction to release said mandrel for withdrawal from the device.

'7. In a device for aflixing a tubular rivet by drawing a mandrel through it, said mandrel having an enlarged head adapted to upset a headless end of a rivet to affix it, a casing, an axially sliding member in said casing having mandrel clamping jaws, one of which is formed with a cam surface, an abutment on the casing in contact with which said surface moves on motion of said member in one direction whereby said jaw is moved to clamp the mandrel and maintain it clamped during continued movement in said direction and means for releasing said jaw on movement of said member in the opposite direction.

SERGO B. DAVITOW.