US1702750A - Portable power-driven rivet spinning and pressing tool - Google Patents

Description

Feb. 19, 1929. 1,102,750

w. STUMPF PORTAB E Pom DRIVEN RIVET sgnmme mnrnsssme' TOOL Filed'oct. 15, 1925 ZSheets-Sheet l Patented Feb. 19, 1929'."

UNITED STATES 1,702,750 PATENT OFFICE.

WALTER ST'O'MIPF, OF BALTIMORE COUNTY, MARYLAND, ASSIGNOR TO THE BLACK & DECKER MANUFACTURING COMPANY, OF 'I'OWSON, MARYLAND, A CORPORATION OF MARYLAND.

PORTABLE POWER-DRIVEN RIVET SPINNING AND PRESSING TOOL.

Application filed October 15, 1925. Serial No. 62,637.

The invention relates to manually portable power-driven rotary tools and particularly to such a tool for use in heading rivets by spinning. The rivets are in accordance with the present practice in rivet spinning ordinarily driven cold, though the tool may be applied to hot riveting.

The tool as shown in the present application is provided with an electric motor connected by suitable gearingto a rotaryspindle which is equipped with a spinning tool adapt ed to engage the point of the rivet and when rotated at the desired speed and applied with a suitable degree of pressure to so' displace the metal as to upset the rivet point, expanding it laterally and forming a smooth convex head. An important feature of the invention is the provision in a tool of the general type described, i. e., a manually portable power-driven rotary tool, of means for applying a spinning toolto the rivet or similar member to be upset as described, with necessary pressure to displace the metal and upset or head over the point of the rivets.

The means referred to consist of arivet head supporting member, referred to herein as an anvil, and means for forcing the anvil toward the spinning tool and vice versa, compressing the rivet between the anvil and spinning tool, the rivet being ordinarily supported laterally by the walls of the hole through which it is passed in the material being riveted.

The tool, as shown, is particularlyadapted for use with large work, as the manufacture of, automobile bodies and the like, which cannot be easily moved to be engaged by theoperative elements of stationary machines, and it may be used to advantage in stationary structures and in numerous instances with small work as brake lining and the like.

In the form shown the anvil is mounted on a transverse arm or foot of an L-shaped sliding bar which slides in hearings in theframe orcase of the tool, the motion being parallel .to the, spindle. The sliding bar is controlled,

and forced toward the spinning tool by means of a slow motion pressure multiplying gear shown in the form of a toggle joint controlled by an elongated hand lever.

In the preferred form shown, one link of the. toggle is formed by the end of the lever,

the toggle link being substantially at right angles to the length of the actuating lever.

with the spinning tool, anvil and anvil support and actuating means in elevation. Flgure 3 1s a View looking from the right 1n Figure 2, showing fragmenta-rily the sliding bar and actuating means, the plane of the figure intersecting the actuating lever on line 3-3. 3 v

Figure 4 is asection on the line 4.4 of Figure 2 looking upward, showing the spindle and other parts of the tool except the anv1l in bottom plan Referring to the drawings by numerals. each of which is used to indicate the same or similar parts in the different figures, the machine as shown includes a motor 1, which is preferable an electric motor, a spindle 2 mounted in an elongated bearing 3 inthe tool casing 4, and carrying at its lower end a rivet spinning tool 5. The spindle 3 is driven from the motor 1 by a train of reduca, gear 7 mounted on the frame on a suitable I stud, not shown, and carrying a pinion 9 which meshes with a toothed gear 10 on the spindle. The motor is provided with suitable shaft bearings 11, as shown, and the spin dle 2, in addition to being mounted in an elongated bearing 3, is provided with a thrust bearing 12 in a recess 14 in the frame engaging a suitable flange 15 on the spindle.

It is of particular interest, in the preferred construction shown, that the tool casing is provided with a rigid integral extension 16 which supports the bearing 3 which extends almost the entire length of the spindle, the exception being the portion occupied by the flange 15 and spinning tool carrier 17. The casing or frame extension also provides a support for the anvil to be described.

a transverse foot 22 which carries the anvil at one end directly beneath the spinning tool 5.. The sliding bar 21,. as shown, is of rectangular cross-section, though the shape is not or": particular importance, the rectangle being elongated in the direction of the radius of the spindle and is mounted to slide in a bearing slot 23 in the frame, the slot and the.

direction of motion being parallel to the spindle 2. The slot as shown is open at the end at 24 from which the sliding rod protrudes and for its entire length on the side remote from the spindle, being closed as to this side by a coverplate 25 which is convenientlyremovable and is held by screws 26 or in any suitable manner. The sliding bar and anvil are actuated by means of a suitable .slow motion pressure multiplying mechanlsm shown 1n the form of a toggle mecha therein and pivotally connected at its upper end at 34 to the laterally expanded end 35 of the lever 31, which acts as the second link of stud seated in the bar.

the toggle, being pivotally connected at 36 to the sliding bar 21 by means of a suitable The end 35 of the lever 31 is as will be noted by examination or Figure 3, mounted in a slot 37 shown also in dotted lines in Figure 2, which provides an opening through the tool casing, exposing a portion of the sliding bar 21 in which the stud 36 is seated, the bar and anvil being shown in Figure 2 at the upper or rivet pressing position. The tool may be referred to in accurate descriptive terms asa portable power-driven rivet spinning and presstool, p e operation will be easily understood I from the preamble and description. The

handle 31 is first raised to lower the anvil or more properly to space it away from the spinnor, and the rivet having been inserted, the worlr. is passed between the anvil andspinnor, the head of the rivet being engaged with the anvil, being conveniently centered by means or the depression 38 therein. The

- "handle 31 is then forced down, bringing the rivet pins 33, 34:, 36 of the toggle lever into alient and forcing the upper pin 36, Figure 2, which is seated in the sliding'bar 21,

carrying the anvil upward to its uppermost position, in which position the anviland the spinner are caused to approach, placing the rivet under longitudinal compression, forcing the spinning tool against the point of the rivet. The motor having been started prefmoat-to erably pribr to the final application of pressure, the spinning tool is rotated at a rela-. tively high speed, the friction thus applied by the pressure and high speed of rotation of the spinning tool serves to gradually displace the metal of the rivet laterally, forming a head or upsetting the rivet in a shape in conlormity to the shape of the spinning tool, which as shown consists of a pair of rollers 39, presenting as combined a laterally concave peripheral face 42, the rollers being mounted to rotate on a pin 40 in forks 41 of the spinner tool shank l7.

i The tool, as shown, has important advantages in its application to large work where a manually portable tool may be moved to convenient positions to conform to the shape of the work which cannot itself be as conveniently moved for the purpose of working with a stationary tool, and the tool may be used on stationary work. Q

The construction described has notable ad vantages, particularly in the extension 16 of the frame, which provides an elongated bearing and a thrust bearing for the spindle, and a slide bearing integral therewith for the sliding bar 21 carrying the anvil, giving absolute rigidity of the parts in applying pressure to the rivets, and in the compact arrangement whereby the anvil is actuatedby the hand lever 31, applying sufiicient pressure to the rivet by slight pressure on the hand lever, the entire mechanism being convenient, compact and powerful and capable of operation by unskilled labor, giving the highest degree of efficiency in the way of speed and perfection of the work produced.

it have thus described specifically and in detail a single embodiment of my invention in ,order that the nature and operation of the same may be clearly understood; however, the specific terms herein are used descriptively rather than in a limitin sense, the scope ol the invention being defined in the claims. i

What it claim and desire to secure by Letters Patent is:

l. A manually portable power-driven tool having amotor, a frame, supporting the motor and having an integral extension, a spindle mounted in the extension and having an elongated bearing therein with gearing connecting the motor to the spindle, a bearing in the extension parallel to the spindle, a sliding bar mounted therein, means for supporting a spinning tool on the spindle, an anvil mounted-on the sliding bar in alignmentwith the spindle, and means for moving the sliding bar with a slow, pressuremultipl ing motion to compress a rivet be tween t e anvil and spinning mechanism.

2. A manually portable power-driven tool having a motor, a casing enclosing the motor and having an integral extension, a spindle mounted in the extension and having an elongated bearing therein with gearing connecting the motor to the spindle, a bearing in the extension parallel to the spindle, a sliding bar mounted therein, means for supporting a spinning tool on the spindle, an

anvil mounted on the sliding bar in align-' ment with the spindle, and means for moving the sliding bar with a slow, pressure-multiplying motion to compress a rivet between the anvil and spinning mechanism, said means comprising a toggle mechanism and a hand lever actuating the same.

3. A manually portable power-driven tool having a motor, a frame carrying the motor and having an integral extension a spindle mounted in the extension and having an elongated bearing therein with gearing connecting the motor to the spindle, a sliding bar having a bearing in the extension parallel to the spindle, means for supporting a spinning tool-0n the spindle, an anvil mounted on the sliding bar, in alignment with the spindle, and means for moving the sliding bar with a slow, pressure-multiplying motion tocompress a rivet between the anvil and spinning mechanism, said means comprising a toggle lever composed of two links, a hand lever formed integral with one link, a ivot pin connecting the hand lever to the sliding bar at the upper end of the toggle, a pin cona frame carrying the motor and having an integral extension, a spindle having anelongated bearing in the extension, and driving connections to the motor, means connecting a rivet spinning tool to the spindle, an anvil, a sliding bar supporting the anvil, a slide bearing for the bar in the extension parallel to the spindle, the bearing being open at one side, a removable cover therefor, a hand lever for actuating the sliding bar to compress a rivet between the spinning tool and anvil, and slow motion, pressure-multiplying means controlled by the handle to actuate the sliding bar.

Signed by me at Baltimore, Maryland, this 13th day of October, 1925.

WALTER STUMPF.

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