US1261972A - Electric riveting-machine. - Google Patents

Description

A. C. TAYLOR.

ELECTRIC RIVETING MAGHl-NE.

APPLICATION FILED SEPT-1.9.1916.

Patented Apr. 9, 1918.

3 SHEETS-SHEET l- A TTOR/VEYS v Patnted Apr. 9,1918;

3 SHEETSSHEET Z Y 4 3 11.1w! INM H IS 1 ll w x xx 4 /& I 9 w w F i 7w K I J h 4 .4 a b ATTORNEYS A. C. TAYLOR.

ELECTRIC RIVEVTING MACHINE.

APPLICATION FILED. SEPT. 19, 1916.

A TTOBNEYS UNITED STATES PATENT orrron.

ALBERTIS C. TAYLOR, F WARREN, OHIO, ASSIGNOR TO THE WINFIEL'D MANUFAC- TUBING COMPANY, OF WARREN,OHIO,-A CORPORATION.

" ELECTRIC RIVETING-MACHIITE.

Specification of Letters Patent.

Application filed September 19 1916. Serial No. 121,026. I v

To all whom it may concern:

Be it known that I, ALBER'rIs C. TAYLOR, a citizen of the United States, residing at Warren, in the 'county of Trumbull and State of Ohio, have invented certain new and useful Improvements in Electric Riveting-Machines, of which the following is a specification.

In the accompanying drawings, Figure 1 4 is front elevation of the machine, and Fig.

2 is a vertical central sectional elevation thereof front to rear. Fig. 3 is a cross section on line 33, Fig. 2.

Fig. 4, Sheet 3, is a side elevation of the upper portion of the machine viewed from the right of Fig. 1 and Fig. 5 is an elevation of the opposite side from Fig. t with the fly or band wheel sectioned away and disclosing the clutch mechanism in full lines. Fig. 6 is a sectional plan view on the line 66, Fig.5, showing the clutch mechanism in section and engaged. Fig. 7 is a section on line 7-7, Fig, 5, Figs. 8 and 9 are details of the bolt and plunger employed in the clutch mechanism hereinafter described.

The invention herein is a modification of the machine shown in'a contemporaneous application filed by me and bearing Ser. No.

- leading up to and adapted to give contact and operating efi'ect to the riveting members a and b. These members, referred to herein as electrodes or dies, since they serve to electrically heat and upset the rivets, are suitably shaped at their ends to engage the head and the-point of the rivet, respectively, the lower electrode being substantially stationary and the upper electrode movable vertically within limits to rest down upon the rivet T, which is first placed in the stock 8.

In riveting operation the first step is to bring the electrodes into acting position on the rivet, as seen in Fig. 2, and this brings the rivet into the electric circuit when the same is closed through the transformer 72 and the electrical connections broadly indicated by 4 which carry the electrodes in their terminals. The upper electrode a is carried by a yoke aarranged to slide independently upon the head h, and suitable nuts and a screw (1 serve to adjust and fix the yoke and electrode in different positions to facilitate operation. Head h is slidably supported in the main frame F having side guides engaging the edge thereof,

' and a weight 'w suspended by a cord or cable is and sheaves Sand S serves to overbalance the head and raise the electrode a to promote a safeand easy operation thereof through the hand lever 3, Fig. 4. The said lever is mounted on a pivot shaft 9 in the body F and which shaft carries a toothed segment 16 engaging a rack-bar or rod 10 bearing at its lower, end against a lug on the rear of head h and slidable vertically in suitable supports in said body, the said rod serving tolower said head and the upper electrode thereon within prescribed limits.

In this machine it is necessary to have the counterweight w heavier than the slide it as there is no other means of raising the e1ectrode a. The rack 10 is not attached to the slide but only bears on projections in the rear. If this rack were attached to the slide when the treadle was tripped, the slide it would travel down and hit slide it and cause the hand lever to come down at a high rate of speed which would be liable to injure the operator. Lever 3 thus becomes the initial actuating member to seat the upper electrode on the rivet, and in the present machine lever 3 also carries an electrical switch. comprising a hand grip 3 pivoted on the extremity of said lever and having a right angled extremity in which a contact 0' is mounted. lhe other contact point a is fixed on or in a right-angled projection on the ends of lever 3, and a fairly stifi' Patented r. 9, 1918.

compression spring 13 is interposed between said right angled projections and keeps the said contact-pointsnormally apart. It follows by this separation of the said contacts and support of grip 3 that the head 72.- can be depressed or lowered to rest the upper electrode on the rivet before the said compression spring will yield enough to bring the said contact points together. Then, however, upon the exertion of further down pressure upon said grip 3' the said contacts will be closed and the electric circuit of which-they constitute a part will also be closed on the transformer and the rivet will be almost instantly heated to an upsetting temperature without materially heating the electrodes. Then a very little further depression of the lever will upset the rivet more or less completely and leave the work to be absolutely completed by the power mechanism.

To this end I employ the power shaft m which has a slight crank 8 with which the coupling rod 7 is suitably connected, and a plunger head It is engaged with said rod and slidably mounted in said guides in head h,.Fig. 3. The head it has a projection or lug 15 at its bottom immediately over electrode a upon which the plunger h is adaptedto bear on its downward thrust, and the presentplan of the machine contemplates a sieigle power stroke through these parts as su cient to complete the riveting. However, additional strokes can be delivered if re uired.

ngagement with the power mechanism is effected through a clutch mechanism on shaft m and adapted to make operating engagement with .the constantly revolvingwheel n, which is otherwise free to rotate on said shaft, Fig. 6. The hub of. said wheel has a recess or hole 34 on its inside, and a collar 35 fixed on shaft m carries a bolt 33 adapted to be thrust into said hole or recess by pressure of the spring 41 behind the same when the wheel turns to engaging position, assuming said bolt to be free or released. However, said bolt is held back by means of a spring pressed plunger 39, having a tooth or point engaging in a recess or hole in the side of said bolt, Fig. 6, and

the said plunger in turn is held back against the pressure of its own springs 42 by a pivoted detent or dog 38 having a tooth 45 normally engaging in a hole in the side of said plunger, Fig. 7. In this retired and normal position of the said parts the wheel n is rotating and shaft m is at rest. The detent 38 is pivoted between its ends in a pivoted lever 40 and becomes the medium for withdrawing the plunger 39 from bolt 33 when said lever is actuated by the treadle mechanism provided for this purpose and which comprises the treadle 26, links 30 and 32 and lever 31 connecting said links. This frees said bolt for locking engagement with wheel n.

After a single revolution of said wheel the bolt is automatically withdrawn first by a cam 36 on collar 35 engaging a beveledlug 37 on the saidfdetent, which is now in engagenient with the plunger 39 and carries it back against its springs 42 and disengages bolt 33. Then as said bolt is carried around a short distance by the wheel the beveled shoulder 48 thereon engages the beveled surface 46 on the plunger and the bolt is withdrawn from the Wheel and ressed back far enough to be again engagedb ger and locked in retirement. As to this mechanism and operation it may be said that the same is shown and claimed in the application above referred to and therefore Yoke a provides an adjustable holder for the upper electrode a and a terminal for the flexible. laminated transformer bands 4, while head it is a carrier for said parts which is operably dependent upon power applied through three sources, to wit:the rack bar 10 which serves as a presser member, the slide h which operates as a striker or hammer, and the weight W or its equivalent which causes an uplift of the head and affords an elastic or yielding connection adapted to maintain working relations between the independently movable parts.

lVhat I claim is:

1. In a machine as described, a pair of electrodes, a movable head carrying one of said electrodes and means to actuate said head comprising a rack separably engaged with said head, a weight to hold said head and rack in working relation, and a lever and tooth ijegment to actuate said rack.

2. A machine as described having a pair of opposed electrodes, and means to raise and lower the upper of said electrode comprising a slidable head and a separate rack slidably mounted to bear down on said head, a hand lever and a toothed segment operated thereby engaging said rack, and a counterweight to maintain said head in bearing engagement with said rack, in combination with a power device to depress said head independently of said rack.

3. A machine as described having a pair ythe plunof alined electrodes and means to raise and lower the upper of said electrodes and to turn the electric current thereon comprising a sliding head carrying the said upper electrode, a rack and a lever'and a toothed segment to actuate said head initially, electric contact points mounted on said lever and adapted to close the electric circuit on said electrodes durin the initial stages of operation, and power means to operate said head finally and independently of said rack and lever mechanism. i

4. The machine described having two electrodes and means to raise and lower the upper electrode. initially comprising a lever to actuate said upper electrode provided with electrical contacts and means on said lever to close said contacts and turn the current on said electrodes, in combination with a slide and power means to actuate said head independently of said lever.

' 5. The machine described comprising a sliding head and an electrode thereon, a rack fixed on said head, a lever and segment to operate said rack, and an over-balancing weight connected with said head to 8. The machine described, comprising a pair of electrodes and a head carrying the upper electrode, a plunger slidably mounted in respect to said head and adapted to bear thereon and power shaft and crank to actuate said plunger.

.9. The machine described, comprising a slidable head and an electrode fixed thereon, in combination with a plunger slidably mounted on said head and adapted to depress the same and a crank shaft and coupling rod operated thereby in actuating relations with said plunger.

10. An electric riveting machine having a slidable head and means to operate the same, and an electrode having a supporting member slidably engaged with said head and means to fix said member and electrode adjlstably at different elevations upon said hea 11. An electric riveting machine having a vertically-movable head and a slidable yoke and a screw and nut to fix said yoke ad justably upon the bottom of said head, an electrode carried by said yoke, and means to operate said head.

12. In an electric riveting machine, a set of opposed electrodes, a vertically-movable head for one of said electrodes, a presser member in separable bearing engagement with said head, means to operate said presser member, a hammer in striking engagement with said head, means to operate said hammer, and means to maintain operable engaging relations between said independently movable parts.

13. In an electric riveting machine, a set of electrodes, a vertically-movable tread having a terminal holder'for one of said electrodes, a presser member bearing upon said head, a hammerin striking relation with said head above said electrode, a device to produce a constant uplift upon said head, and separate mechanisms to operate said hammer and presser member, respectively.

14. In an electric riveting machine, a set of opposed electrodes, a slidable head carrying one of said electrodes, self-acting means to raise said head, ahammer in striking relation opposite said head, power-operable means to actuate said hammer, a slidable presser bar in bearing engagement with said head, and manually-operable means to actuate said presser bar.

15. In an electric riveting machine, an upperand a lower electrode and movable holders for each,'a device to apply pressure on the upper electrode through its holder,.

self-acting means to raise said upper electrode and its holder, and a movable support for the lower electrode having a yielding backin gto accommodate excess pressure upon the work and lower electrode.

16. In an electric riveting machine, an upper and lower electrode and independently movable holders therefor, a yielding bumper for one of said holders and a striking hammer and separate presser member for the other holder. and independent operating means for said hammer and presser member, respectively. v

17 In electric riveting machines, a set of electrodes having separate holders, a movable head for one of said holders, a striking hammer and a separate presser member for said head, power applying means for said hammer, a treadle and means connected therewith to control the operation of saidv power applying means, and a manuallyoperable device for said presser member, in combination with electrical means to transmit an electric heating current to said electrodes during riveting operations.

18. Inxan electric riveting machine, a set of electrodes, a slidable head carrying one of said electrodes, a member to depress said head a lever to operate said member, an electric switch havlng a handle mounted 'upon said lever for joint operation of the device, and a treadle and operating connections for said clutch mechanism.

In testimony whereof I affix my signature in presence of two witnesses.

ALBERTIS C. TAYLOR. Vitnesses A. E. TONDUS, J. H. EWALT.

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