US1689460A

US1689460A - Rivet-spinning attachment

Info

Publication number: US1689460A
Application number: US67264A
Authority: US
Inventors: Stumpf Walter
Original assignee: Black and Decker Manufacturing Co
Current assignee: Black and Decker Corp
Priority date: 1925-11-06
Filing date: 1925-11-06
Publication date: 1928-10-30
Anticipated expiration: 1945-10-30

Description

Oct'; 30, 1928. 1,689,460

w. STUMPF RQIVET SPINNING ATTACHMENT Filed Nov. 6, 1925 2 Sheets-Sheet l Oct. 30, 192s] 1,689,460 w. STUMPF RIVET SPINNING ATTACHMENT W Filed Nov. 6, 1925 2 Shets-Sheet 2 Patented Oct. 30, 1928.

UNITED STATES l th-9,460 PATENT OFFICE.

WALTER STUMPF, OF BALTIMORE COUNTY, MARYLAND, ASSIGNOR TO THE BLACK AND DECKER MANUFACTURING COMPANY, 3F TOJVSON, MARYLAND, A COBPORA- TION F MARYLAND.

RIVET-SPINNIHG' ATTACHMENT.

Application filed November 6, 1925. Serial No. 67,264.

The invention relates to an attachment in the nature of a special bit for a portable, power-driven, rotary tool of the type most generally used for drilling. These tools in some instances more or less modified as to certain details, are also used for other pur poses as screw-driving, nut and bolt setting, bailing, grinding and valve. grinding.

The object of the present. invention is to provide means whereby a power-driven portable drill or screw-driver, etc, is immediately adapted for use in heading or setting rivets by spinning. The rivet spinning oporation as performed in this way, the rivets heing most generally handled cold, consists in applying a moderate degree of pressure to the points of the rivets in the direction. tending to upset and head them, at the same time rotating the pressing member at a high speed, so that the pressing tool, being cupshaped, the metal forming the rivet end or point, is caused to flow laterally and assume a convex form corresponding to the shape of the inside of the cup.

Stationary rivet spinning machines are quite generally used. In the manufacture of automobile bodies and other comparatively bulky sheet metal products, small rivets are driven in large numbers and headed cold. These cannot be conveniently set by means of a stationary machine on account of the diliiculty in handling the article which is being manufactured and have therefore been set by hand with a hammer. The spinning operation can be performed by a workman having less skill and is much neater, quicker and more uniform, and with the present attachment, any portable, power-driven, rotary tool of the general type referred to can be used for this purpose.

The attachment comprises a spindle or bit adapted to be inserted in the chuck of the rotary tool, and is equipped at its lower end with a spinning tool and a work support. The spindle carries a laterally extending guiding block or hearing member mounted thereon, the spindle being in effect mounted to rotate in a suitable bearing in said mem her. The work support or anvil is aligned with the rivet-spinning tool, and carried by a sliding bar mounted in a slide bearing in said block or hearing memberparallel to the spindle hearing. The sliding bar is actuated by a hand lever by the operation of which ihe anvil is pressed upward against the work; in other words, the a. vil is caused to approach the spinnin tool whereby the rivet head being engaged by the anvil, the,

rivet is compressed between the spinning tool and the anvil, and the tool being then rotated, the spinning operation is performed.

in the accon'ipanying drawing I have illustrated a rivet spinning attachment embody-i ing an electric drill equipped with the attachment of the invention.

c 'c ring to the drawings by numerals, each which is used to indicate the same or similar parts in the different figures, the illustration includes a portable, powerdriven, rotary tool 1, the tool illustrated being a small electric drill to which the rivet-spinning attachment is connected by chuck 2. i

The rivet-spinning attachment consists of the spindle l, anvil or work support 5 and bearing block 6, and is provided with parallel bearings consisting of a rotary bearing 7 for the spindle i and slide bearing 8, in which latter is mounted the sliding bar 9 supporting the anvil 5. The rivet-spinning a. fragmentary elevation looktool 11 mounted on the lower end of spin dle e and the anvil 5 is in alignment with the tool in the direction of the spindle axis so that the traverse of the bar carries the anvil toward and from the spinning tool.

The sliding bar is actuated by a toggle 12 controlled by hand lever 13. 5

Tie rotary spindle 4 is held in the bearing by a collar 1%- at the top, secured by means of a set-screw 15, and abovethe co1- lar the spindle is provided with a reduced shank 16 adapted to enter and be secured in the chuck 2. Below the bearing block 6 the spindle 1 is provided with a thrust hearing 17 which bears against the bottom face of the block, and a shoulder 18 on the shank. The tool shank below the shoulder is in the form of a fork 19 in which is mounted the spinning tool 11 on a transverse pin 20, the tool beingshown as of the regular type now in use, consisting out a plurality of rollers forming together a concave peripheral surface 21 with a central slot or radial opening 22.

The sliding bar 9 as shown is rectangular and the bearing 8 is likewise rectangular and ofsimilar dimensions to receive and fit the sliding bar. The latter is formed at its lower end with a transverse base bar 24 so that the entire sliding member may be referred to as L-shaped. The anvil 5 is shown as having a threaded shank 25 seated in a threaded hole 26 in the end of the base 24 and directly in alignment with the axis of the spindle a and with the spinning tool 11. The screw-shank 26- has a suitable head 27 and is held in adjusted position by a lock nut 28.

The toggle 12 comprises a link 29 pivotally connected at 30 to the bearing block 6, and also pivotally connected at 31 at its upper end to the hand lever 13, the pivot end of which 32" forms the second link of the toggle being otherwise pivoted at 33 to the sliding bar 9. The two pivot points 31 and on the handle lever link are spaced apart a distance corresponding to the length of the other link 29. The link end 32 of the hand lever is seated in a slot 34 in the block which enters the bearing cavity 8 and exposes the sliding bar. The bearing cavity 8 is open at the left in Figure 1, the opening being covered by a cover plate 35 held by screws 36.

The operation of the rivet spinning tool will be fully understood from the description and preamble. The drill or similar tool in connection with which it is used and by which it is operated may be used for the various purposes to which it is adapted as drilling, screw-driving, grinding, boiling or the like, the attachment herein described being no more than a special bit which can be removed and set aside with the other equipment of the tool and used when desired. With this attachment the portable drill or similar tool becomes adapted for use in spinning or heading rivets particularly small rivets which are set cold though it may be adapted tor hot riveting, the work produced being neater and more uniform and quicker, cheaper and more economical than can be produced by hand or with stationary machines, the use of stationary machines with lar e work being inconvenient, slow and comparatively expensive.

I have thus described specifically and in detail a rivet spinning attachmentembodying my invention in the preferred form in able, power-driven, rotary tool, the attach-' ment consisting of a spindle having one end adapted to be connected to a rotary portion 01 the tool the other end being adapted to support a rivet spinning bit, a work support, a sliding bar on which said support is mounted in alignment with the spindle, a bearing for the sliding bar parallel to the spindle, means includin a thrust bearing mounted on the spindle supporting said bearing for the sliding bar, and means for actuating the slidingibar to compress the rivet between the work support and the tool.

2. A rivet spinning bit for a portable power-driven tool or other hand tool comprising a spindle having at one end a shank adapted to be engaged by a bit chuck and at the other end a rivet spinning tool, an anvil supported by the spindle in alignment with the rivet spinning tool, and means for moving the anvil toward the tool to compress a rivet be tween the tool and the anvil.

3. A rivet spinning bit comprising a shank adapted to be engaged by a bit chuck, a rivet spinning tool carried by and connected to said shank to be rotated thereby, a work support also carried by the shank and means for controlling the relative position of he work support and l it whereby a rivet may be compressed between the rivet spinning tool which is applied to the point of the rivet and the work support which is applied to the head of the rivet.

4. A rivet spinning bit for a portable rotary tool, the bit having a shank adapted for connection with a rotary portion of the tool, a rivet spinning tool connected to said shank to be rotated thereby, a guide, means supporting the same on the shank, a sliding bar mounted therein to move parallel to the axis of said rotation of the rivet spinning tool, an anvil carried by the sliding bar in alignment with the spinning tool in the direction of the said axis. thereof, and means carried by the bit for actuating the sliding bar to cause the 1 v. a no: c1 21o t V vnerer e no an il to 13 ii ll 0ol v by th 1 1 being applied to the point oi. the rivet and the anvil to the head, the rivet may be compressed between the tool and the anvil.

Signed by me at Baltimore, lviaryland, this 3 day of November, 1925.

WVALTER STUMPF.