US2649122A

US2649122A - Motor-driven hand tool for making wrapped wire connections

Info

Publication number: US2649122A
Application number: US15838A
Authority: US
Inventors: Rudolph F Mallina
Original assignee: Bell Telephone Laboratories Inc
Current assignee: AT&T Corp
Priority date: 1948-03-19
Filing date: 1948-03-19
Publication date: 1953-08-18
Anticipated expiration: 1970-08-18

Description

Aug. 18, 1953 R. F. MALLINA 2,649,122

MOTOR-DRIVEN HAND TOOL FOR MAKING WRAPPED WIRE CONNECTIONS Filed March 19, 1948 wwrlv TO/P R. F MA LL INA 3 @kiQ/XM ATTORNE V Patented Aug. 18, 1953 UNITED STATES TENT OFFICE MOTOR-DRIVEN HAND TOOL FOR MAKING WRAPPED WIRE CONNECTIONS New York Application March 19, 1948, Serial No. 15,838

Claims.

This invention relates to wiring tools and more specifically to a tool for effecting solderless connections between connecting wires and terminals, for, example, of the type used in electrical apparatus.

The object of the present invention is the provision of a wiring tool of the type above-mentioned by which a wire is wound or wrapped on a terminal to effect an electrical connection therebetween without requiring the soldering of the joint for efiicient electrical conductivity between the wire and the terminal.

A feature of the invention is the provision of two motors, one electrical and the other in the form of a clock spring for rotating a wire winding spindle in opposite directions, in one direction by theoperation of the electric motor for tensioning the motor spring and in the opposite direction by the tension of the motor spring for rotating the spindle which winds the wire around the terminal.

Another novel feature of the invention is the provision of a friction clutch mechanism for preventing the stalling of the electric motor following the tensioning of the motor spring preparatory to the operation of the winding spindle by the motor spring.

Another novel feature is the provision of a speed gear reduction mechanism operatively connecting the clutch device to a shaft coupled to the motor spring for tensioning the latter upon the operation of the electric motor, a gear in the speed reduction mechanism having means cooperating with means carried by a frame for the tool for arresting the movement of the gear mechanism both during the tensioning cycle of the motor spring by the electric motor and at the end of the winding of the wire on the terminal by the tension of the motor spring.

Another novel feature is the provision of manually operable means for disengaging the friction clutch device for permitting the movement of the winding spindle by the operation of the motor spring.

Another novel feature is the provision of a centrifugal governor actuated by the tension of the motor spring for controlling the operation of the wire twisting spindle during the winding operation of the wire on the terminal.

Other novel features and advantages of the invention will appear from the following description and by the claims appended thereto reference being bad to the accompanying drawing, in which:

Fig. 1 is a side assembly view;

Fig. 2 is a front view shown with a number of operating parts with portions broken away;

- Fig. is a vertical cross-sectional view taken on line 33 of Fig. 1; and

Fig. 4 is a vertical cross-sectional view taken on line AA of Fig. 1.

In accordance with the construction of the wiring tool of this invention, a mounting for the mechanism is formed with a handle l0 having on each of its opposite sides a flange portion II, servingas a base for receiving an electric motor I? which is secured to the flange portions II as by a plurality of screws I3. The mounting is also formed with a projection in the form of a rib I4 having upright supports l5, I6 and I1. Upright i5 terminates with an enlarged portion 13 for receiving a sleeve 27 cooperating with a bearing E9 in upright ii for rotatably supporting a spindle 28 the function of which will be hereinafter described in detail. 1

On the armature shaft of motor [2 is keyed a friction clutch element 24 disposed in engageable relation with a complement clutch element 22 formed with a collar Y and a pinion 25. The unit thus constructed is mounted for free movement on a shaft 23 journaled at one end in a bearing 24 in upright l5 and its opposite end in a bore in the armature shaft of motor [2 as best seen in Fig. 1. Pinion 25 meshes with a gear 26 keyed on spindle 20 for rotating the latter and a pinion Fig. 1.

28 keyed on this spindle upon the operation of motor I2. Pinion 28 meshes with a gear 29 keyed on shaft 23 and on this shaft is attached the inner convolution of a clock spring 3|, the outerdisposed convolution of which is hooked to a pin 32 laterally extending from upright IS. A pin 33 carried by the gear 29 cooperates with a projection 34 laterally extending from upright l5 for holding the gear 29 and thereby the pinions 28 and therefore spindle 29 in normal starting position against the normal tension of clock spring 3|.

A centrifugal speed governor in the form of two fly weights 35 and 36 operated by shaft 23 frictionally engage the inner periphery of a drum 31 secured to the upright l6 for controlling the speed of motor 12 when winding the spring 3|, in addition to controlling the speed of spindle 20 when actuated by the tension of clock spring 3| which occurs upon the manual operation of a trigger member 38 pivoted at 39 in the projection 14 as shown in Figs. 1, 2 and 4. This trigger member has a forked end portion 40 fitted in collar Y to move the clutch element 22 out of engagement from clutch element 2| against the tension of a spring 4| coiled around a stud 45 to serve for holding the clutch elements 21 and 22 normally in the engaged position as shown in The spindle at its front disposed end is provided at its periphery with a longitudinally disposed groove or slot 42 for receiving the end of the wire to be wound around a terminal, not shown, inserted in a drilled hole 43 in the spindle 20 for winding the wire therearound in a manner fully described in a copending application in the name of Hickman-Mallina Reck Serial No. 753,066 filed June 6, 1947, now Patent "No. 2,585,010.

A typical example of operation of this total in the winding or wrapping of a wire around a terminal for efiecting a solderless connection therebetween is as follows: Considering the operating parts in the position shown in Fig. 1, that is, the friction clutch elements 2|22 engaged by the tension of spring A! and the stop pins 33--34 abutting against each other by the normal tension of clock spring 3|, the operation of motor i2 is effective to rotate the pinion mounted for free rotation on shaft 23 and thereby the spindle 20 through gear 26, the pinion 28 keyed on this shaft and gear 29 in engagement with pinion 28 thus rotating shaft 23 carrying the fly weights 35 of the governor. Rotation of shaft 23 is effective to tension the clock spring 3! to a point wherein the pin 33 engages the opposite side of stop pin 34 from the position shown in Fig. 1. The-terminal and wire are then inserted into the spindle. The trigger 3G is manually operated for releasing the clutch elements 2 l-22 so as to permit the rotation of shaft 23 and that of spindle 20 in the opposite direction under control of governor 35-35 for winding the wire around the terminal until the pin 33 carried by gear 2% reengages the stop pin 34 carried by upright 15. The terminal is then removed from the spindle and the tool is now ready for another wire winding operation, upon the release of trigger member the consequent reengagement of clutch elements A 2l22 under the tension of retractile spring a! and the resulting rewinding of spring 33.

During the tensioning of clock spring St the

fly weights

35 and 35 of the governor do not offer an appreciable restraining torque to the operation of the motor because of the gear reduction from pinion 28 to gear 29, but the fiy weights effectively control the operation of spindle 2%) when rotated under tension of the clock spring 3! which thus serves as a motor for driving the spindle.

What is claimed is:

1. A wiring tool for wrapping a wire on a terminal, said tool comprising an electric motor, a wrapping spindle, a motor spring, a rotatable shaft connected to the motor spring, a gear mech anism operatively connecting said spindle to' said electric motor, another gear mechanism operatively connecting said spindle to said shaft for tensioning said motor spring upon the ope-ration of said electric motor, and a clutch mechanism manually operable for disconnecting the first= mentioned gear mechanism from said electric motor to allow the operation of said spindle by said motor spring by way of the last-mentioned gear mechanism for wrapping the wire on the terminal.

2. A wiring tool for effecting a wrapped electrical connection between a wire and a terminal, said tool comprising a motor, a first clutch element on the armature shaft of said motor,- a shaft disposed in coaxial relation to said armature shaft, a complementary clutch element mounte'dfor' free rotation on said shaft and normally engaged to said first clutch element, said 4 clutch element having a collar portion and a pinion secured thereto, a spindle shaft mounted parallel to said shaft, a first gea-ron said spindle shaft mating with said pinion forming a first gear mechanism, a second pinion on said spindle sh-aft, a gear on said shaft mating with said second pinion forming a second gear mechanism operativel'y connecting said shaft and said spindle shaft, a meter spring on said shaft between said gear on said shaft and the first mentioned pinion, said motor spring being tensioned by said motor through said'two gear mechanisms and through said spindle shaft when said clutch elements are normail-y engaged, a wire winding spindle carried by said spindle shaft, and manually operable means connected to said collar portion for disengaging said normally engaged clutch elements, whereby said motor spring rotates said spindle through said second gear mechanism to wrap the connection.

3. A wiring tool for effecting a wrapped 'electrical connection between a wire and a terminal in accordance with claim 2, wherein said tool comprises also three uprights, the first of said uprights supporting the one end of said shaft and one end of said spindle shaft, said first upright having a projection thereon, a pin on said gear on said shaft mating with said projection to limit the motion of said shaft in either direction, the second of said uprights being adjacent said motor spring and between said motor spring and said pinion, one end of said motor spring being secured to said second upright, the other end of said motor spring being secured to said shaft, said shaft passing through said second upright and being supported thereby, and said third upright supporting the other end of said spindle shaft.

4. A wire wrapping tool comprising aframe, an electric motor and a spring motor mounted on the frame, a gear train interconnecting the motors through a normally engaged clutch for winding up the spring motor, a pin on an el'e' ment of the gear train and a stop on the frame for limiting the wind up and thus the'energy stored by the spring, a wire wrapping spindle connected to the spring motor through a portion of the gear train, and manually operable means for disengaging the clutch to allow the spring motor to drive the spindle for a limited number of turns as determined by the pin and stop to perform a wire wrapping operation.

5. A wire wrapping tool comprising a frame, a motor, and energy storage means, a gear train interconnecting the motor and the storage means through a normally engaged clutch for biasing the storage means to an energy storing condition, pin and stop means mounted respectively on an element of the gear train and on the frame, for limiting the energy stored in the storage means, a wire wrapping spindle including a-wire receiving slot adjacent to its outer extremity. the spindle being connected to the energy storage means through a portion of the gear train in-'&

to the frame, and means for optionally disengaging the clutch to allow the energy storage means to supply power to the spindle for a-wire.

wrapping operation.

RUDGLPH F. minim,

(References sn'fnlowing page) References Cited in the tile of this patent UNITED STATES PATENTS Number Name Date Wortman Oct. 27, 1891 Langer Sept. 17, 1907 Jenney Apr. 2, 1912 Taliaferro Mar. 7, 1916 School Aug. 28, 1917 Bush Dec. 11, 1917 Kocourek May 14, 1918 Jones June 4, 1918 Wenzelmann Oct. 29, 1918 Number 6 Name Date Piersen Nov, 16, 1920 Jones Feb. 14, 1922 Tydings Aug. 26, 1924 Squibb Aug. 11, 1925 Smith May 4, 1926 De Bold Nov. 6, 1926 Babcock July 5, 1927 Schneider July 5, 1927 Foulder Aug. 21, 1928 Wright May 14, 1929 Von Kramer June 19, 1945 Beard Oct. 2, 1945