US964701A - Machine for tapering coiled springs. - Google Patents

Description

G. H. SCOTT.

MACHINE FOR TAPERING GOILED SPRINGS. APPLICATION FILED FEB.14, 1908.

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GEORGE H. SCOTT, 0F WORCESTER, MASSACHUSETTS, .ASSIGNOR TO MQRGAN SPRING- COMPANY, OF WORCESTER, MASSACHUSETTS, A CORPORATIGN OF MASSACHUSETTS.

MACHINE FOR TAPERING COILEID SPRINGS.

Application filed. February 14, 1908.

T 0 all whom it may concern:

Be it known that I, GEORGE H. SCOTT, a citizen of the United States, residing at Worcester, in the county of Worcester and Commonwealth of Massachusetts, have in vented a new and useful Machine for Tapering Coiled Springs, of which the following is a specification, accompanied by drawings forming a part of the same, in which Figure 1 is an end view of my spring tapering machine. Fig. 2 is an end view of the same, partly in section. Fig. 3 is a central vertical sectional view on line 3-3, Fig. 1. Fig. #1 is a detached perspective view of the spring guide. Fig. 5 is a plan View of the machine. Fig. 6 is a vertical sectional view on line 66, Fig. 5, looking in the direction of the arrow (4. Fig. 7 is a vertical sectional View on line 66, Fig. 5, looking in the direction of the arrow 6. Figs. 8 and 9 represent coiled springs'having their ends tapered in different forms.

Similar reference letters and figures refer to similar parts inthe different views.

My present invention relates to a machine for tapering the ends of coiled wire springs by which they are reduced in diameter to enable the pulling strain, in springs known as tension springs, to be applied in the axial line of the spring, or, if desired, to receive the screw threaded shank of an attaching hook, and it consists in the construction and arrangement of parts as hereinafter described and pointed out in the annexed claims. In my machine I provide a guide for the end of the spring, said guide having a taper corresponding to the desired taper of the spring, and on opposite sides of the guide I place grooved rolls having tapering or beveled faces corresponding to the desired taper of the spring, which cooperate with the guide and by their revolution impart a rotary movement to the spring, and by pressure against the spring gradually compress it to a tapered form as determined by the beveled faces of the rolls. 1 also provide means for the rotation of the grooved rolls, means for holding them in operative position against the spring, and means acting automatically for separating the rolls to release the spring upon the completion of the operation.

Referring to the accompanying drawings 1 denotes the framework of the machine, in which is supported a rotating shaft 2 sur- Specification of Letters Patent.

Patented July 19, 1916.

Serial No. 415,851.

rounded by a bushing 3. The shaft 2 is driven by a belt pulley 4 in the usual manner. Carried on the shaft 2 is a gear wheel 5 engaging gears 6, 6, mounted on the rear ends of shafts 7 and 8, journaled in sleeves 9 which are supported upon depending arms 10, 11, mounted alternately 011 the bushing 3, and concentrically with the shaft 2 and capable of a rocking movement thereon. Rolls 12, 12 having beveled faces provided with circumferential grooves, are mounted on the front ends of the shafts 7 and 8 and rotated by the gears 6, 6. The front ends of the sleeves 9 are provided with upright arms 13 carrying in their upper ends pins 1a and 15. A lever 16 is pivoted upon the pin lt, and upon the pin 15 is pivoted one end of a link 17 which is pivotally connected at its opposite end by a pin 17 a to the lever 16, forming a toggle joint connection between the arms 13. Upright arms 18 are mounted upon the rear ends of the sleeves 9 and are connected by links 19 with a rocking lever 20, pivoted at its center to a fixed arm 21 mounted upon the framework of the machine.

Integral with the lever 16 is an arm 22 which extends beneath the horizontal arm 23 of a bell crank lever 24: pivoted at 25 to the frame of the machine. The other arm 26 engages a block 27, capable of sliding in horizontal ways 28 and carrying an adjustable screw 29.

Attached to the frame of the machine is a vertical plate 30, provided at its upper end with a hole 31 to receive the end of the spring to be compressed, and projecting from the rear of the plate 30 and immediately above and below the hole 31 are prongs 32 and 38, having an inclosed space 34 corresponding to the desired taper of the end of the spring. The prongs 32 and 33 are sufliciently narrow to pass between the grooved rolls 12 and allow them to press against the sides of the spring, the prongs serving as a guide for the spring as it advances between the grooved rolls and preventing its vertical displacement. When the end of the spring has been advanced between the rolls 12 the desired distance, the advancing end strikes the screw 29 and pushes the sliding block 27 in its way. The sliding block 27 engaging the arm 26 rocks the bell crank lever 21 to depress its horizontal arm 23, thereby raising the lever 16 which releases the toggle joint formed by the lever 16 and link 17. When the toggle joint connection between the arms 13 has thus been released by the advancing end of the spring, the grooved rolls 12 are immediately thrown apart by means of a spring 35, interposed between the spring sockets 36 formed on the swinging sleeves 9. The link 17 is provided with an adjustable set screw 37 which strikes the top of one of the arms 13 as the lever 16 is depressed to allow the center of the pivotal pin 17 to be brought barely below the line of centers of the pins 14:- and 15, which looks the upright arms 13 in position and prevents the accidental separation of the rolls 12, 12. The rocking lever 20 and links 19 serve to keep the rear arms 18 in proper relation to each other and insure their simultaneous movement.

In the operation of my machine I insert the end of a wire spring in the hole 31, and by the depression of the lever 16 bring the rotating grooved rolls into operative position. The circumferential grooves on the rolls 12 engage the spiral coils of the spring on diametrically opposite sides of the spring, and immediately impart a rotating movement to the spring, which is gradually advanced between the rolls owing to the pitch of the spiral coils of the spring. As the spring advances between the rolls 12 its diameter is gradually decreased by reason of the increased diameter of the rolls, and the desired taper is imparted to the spring by the compression of its coils. WVhen the advancing end of the spring contacts with the end of the screw 29, which has been previously adjusted to obtain the desired length of taper, the sliding block 27 is moved and the lever 16 lifted by the action of the bell crank 24, allowing the spring 35 to imme diately separate the rolls 12 and enable the spring to be withdrawn. The lever 16 may be raised by the operator at any time in the process in order to stop the operation of the machine.

While my machine is primarily designed for tapering the ends of what are known as tension springs made from coiled wire, it may be used for tapering any form of coiled wire whether sufficiently elastic to form a spring or not.

I claim- 1. In a machine of the class described, the combination of cooperating rolls constructed with gradually increasing diameter, means for rotating said rolls, means for conducting a wire coil between said rolls beginning at the ends of smallest diameter, and means for separating said rolls, said means operated by said coil as it advances between said rolls.

2. In a machine of the class described, the combination of cooperating rolls constructed with gradually increasing diameter, means for rotating said rolls, means for conducting a wire coil between said rolls, and means for automatically separating said I'Olls to release said coil when said coil has received the desired length of taper.

3. In a machine of the class described, the combination of tapering grooved rolls, means for locking said rolls in a posit-ion to compress a wire coil between them, means for rotating said rolls, means acting automatically for releasing said rolls when the wire coil has received the desired length of taper, and means for separating said rolls.

4. In a machine of the class described, the combination with parallel shafts supported by swinging arms, means for rotating said shafts, of tapering rolls carried by said shafts arranged to compress a wire coil be tween them, means for rocking said arms to bring the tapering rolls into cooperative position, and means for locking said arms to hold said rolls in said cooperative position.

5. In a machine of the class described, the combination with cooperating rolls constructed with gradually increasing diameter, means for rotating said rolls, means for conducting a wire coil between said rolls, means for automatically separating said rolls to release said coil when said coil has received the desired length of taper, and means for operating said separating means at will if clesired.

6. In a machine of the class described, the combination with tapering grooved rolls arranged to compress a Wire coil between them, parallel shafts carrying said rolls, means for rotating said shafts, arms supporting said shafts and capable of movement about a common center, means for rocking said arms to vary the distance of said rolls, and means for locking said rolls in a cooperative position.

7. In a machine of the class described, the combination with cooperating rolls having a tapering periphery provided with grooves, means for rotating said rolls, means for locking said rolls in cooperative position, a slidable block arranged to be moved by said wire coil, means operated by the movement of said block for releasing said rolls, and means for separating said rolls.

8. In a machine of the class described, the combination of tapering grooved rolls, the grooves on said rolls arranged to engage a coil of wire and draw it between said rolls, means for rotating said rolls, and means for separating said rolls at a predetermined point in the operation of the machine.

Dated this tenth day of February 1908.

GEORGE H. SCOTT.

I/Vitnesses:

RUFUS B. FOWLER, PENELOPE COMBERBAGH.

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