US1595793A - Insulation-stripping mechanism - Google Patents

Description

Aug. 10 1926. 1,595,793

D. LEVINGER ET AL INSULATION STRIPPING MECHANISM Filed Nov. 7. 1921 5 Sheets-Sheet 1 Aug. 10 1926. 1,595,793

D. LEVINGER ET AL ,5 [rzflerzZors \g -41; fldfld Lei/492587 ix; ll 7/ @f ,W J M Patented Aug. 10, 1926.

UNITED sTATEs 1,595,193 PATENT OFFICE;

navm 'LEVfIIN'GER AND ammo ENGELHABD BALDUF, or CHICAGO, rumors, AS-

sren'ons r wns'rnnn ELECTRIC COMPANY, mconronmrnn, or new YORK, N. "2.,

A CORPORATION OF NEW YORK.

INS'ULATION-STRIPPING MECHANISM.

Application med November 7, 1921 Serial No. 518,828.

This invention relates to mechanism for removing the insulating coverings from theends of insulated conductors and has for its object the rovision of a simple and convenient mec anism by means of which the insulating covering may be ra idly and efficiently removed from the en s of conductors without any particular skill or previous training on the part of the operator. In accordance with the general features of this invention, there is provided a mechanism in which a plurality of severing members are caused to be engaged with the insulating covering of a conductor inserted between them'to sever the covering from the conductor upon relative rotation of the severing members and the conductor and to stri the insulation from the conductor upon a re ative longitudinal movement of the con ductor and the severing elements. In the preferred form of the mechanism the severing members are electrically heated elements, although it will be obvious that the invention in its broader aspects is not limited to sucl1,elements.

Other features of this invention relate to the construction and combination of parts which provide for a compact structure adapted to be conveniently mounted upon a work bench with the working parts easily accessible for repair and replacement and to the features of construction for roviding for the rem'ovalof the stripped lnsulation from the machine.

In the drawings .Fig. 1 is a front elevation of the complete mechanism with the cover and base member in section and the face plate removed;

Fig. 2 is a vertical section taken om the line 2 2 of Fig. 1 looking in the direction indicated by the arrows;

Fig. 3 is a fragmentary vertical section taken on the line 33 of Fig. 2 looking in the direction indicated by the arrows;

4 Fig. 4 is a section taken on the line 44 of Fig. 3 looking in the direction indicated by the arrows;

Fig. 5 is a plan view of the complete mechanism with the covers partly removed and the face plate in section;

Fig. 6 is a fragmentary front elevation of the mechanism showing the opening in the face plate for the entrance of the conductors;

block 20 by a pin 25.

V Fig. 7 is a dperspective view of the electrically heate blades with their supports shown in their operative position with a conductor therebetween, the arrow indicating V the direction of the slight twist which the operator gives the conductor in removing it when stripping the severed insulation therefrom, and

Fig. 8 is a view of the end of the conductor with the insulation removed therefrom.

As shown .in the drawings, 10 is a frame or support for the mechanism provided with a flanged base 11 spanning an opening 12 in a bench or other suitable supporting means 13 towhich it is secured. Extending from the base 11 and through the opening 12 of the bench 13 is a funnel shaped member 1 1 through which the stripped insulation mayfall and into a suitable receptacle placed i thereunder, or if desired, the member 14 may be connected. with a suitable exhaust system for drawing off the stripped insulation as it falls. The rear wall of the frame 10 is enlarged as indicated at 17 and above this portion is a section indicated at 18 provided on its inside face with a flat guide surface 19 upon which rides a block 20. Passing through an opening 21 in theenlarged section 17 of the frame 11 is an opcrating rod 22 which may be connected by a I link 24 to a'suitable foot treadle or other operating means, not shown. The operating rod 22 near its upper end is connected to the Screw threaded into the opening 21 at the bottom of the frame 10 is a plug 26. Within the opening 21 and between the plug 26 and a bushing 27 hearing against the block 20 is a compression spring 28. The rod 22 is guided vertically 1n 1ts movement up and down by theplug 26 and the bushing 27, and the block 20 pinned thereto is kept from turning by its engagement with the flat guide surface 19. Projecting forward from the rear wall 18 is a member 31 against which the upper surface of the block 20 bears. The rod 22 projects throu h the member" '31 and has screw threa ed onto its end adjusting nuts ,32 which by their spacingfrom the member 31 determine the movement downward of the block 20 when the rod 22 is moved downward. Supported in the side walls of the frame 10 and directly in line-with the upper and lower edges of the block 20 are supports connecting lead at 45.

or rails 33 upon which ride carriages 34, one for each of the burning blades 35. The carriages 34 are each equipped with a pin 38 suitablysecured thereto at one end; the other end indicated at 39 is rectangular shaped and extends rearward into cam slots 40 formed in the block 20. The cam slots 40 are so formed in the block that upon a slight movement downward of the block 20 the rectangular shaped heads 39 will be moved horizontally toward each other, thereby moving the carriages 34 supporting the burning blades 35. upon the rails 33 in the same direction. Mounted in front of each carriage 34 is ashouldered insulating block 41 preferably composed of asbestos lumber. The electrically heated blades or burning elements are wired in series. The supply leads are indicated at 43 and 44 and the The leads 43, 44 and 45 are positioned on shoulders formed on the insulating blocks 41 and are connected to the burning elements 35 by copper terminal blocks 46 to which the elements 35 are secured by screws 47, 47. Spanning the ends of the copper terminal blocks 46 bearing against the insulating blocks 41 of each element 35 is first an insulating cap 51 preferably madefrom mica and next thereto is a steel cap 52. Passing through the steel cap 52, mica cap 51 and the insulating block 41 and screw threaded into the block 20 is a screw 53 for clamping the terminal block 46 in place on the insulating block 41 with the ends of the leads 43, 44 and 45 clamped therebetween. As indicated in Fig. 1, the elements 35 are slotted at 54 where they are secured to the terminal blocks 46 'by the screws 47 to facilitate the renewal of the elements in case they are burnt out. The leads 43, 44 and 45 are preferably made from laminated copper strip formed into a suitable shape to allow for the free movement of the burning elements 35 when operated. The supply leads 43 and 44, as indicated in Figs. 1, 2 and 5, are formed to extend downward from the point where they are clamped to the terminal blocks 46 and then outward and inward, forming U-shaped portions 57, thereby allowing for the movement of the burning elements 35 (see Fig. 5). After the U-shaped formation the leads are formed to pass rearward through an insulating bushing 58 secured in the rear wall of the frame 10 but separated one from the other by a strip of insulation 59, after which they are connected to the inain supply leads 60. and 61 housed in an auxiliary casing 62 and insulated therefrom by a block 63 composed of some suitable insulating material.

The main supply leads and\ 61 pass through the opening 12 in the benchj13 and are connected to a suitable. electrical supply source with a rheostat included in the; circuit in order to control the heat of the elements 35. The connecting lead 45 is formed to extend upward from the points where it is clamped to the terminal blocks 46, then outward and then inward to a point midway between the ends thereof. At this point it rests upon a fiber washer 64 and is suitably shaped to facilitate the free movement of the burning elements 35 when operated. A

72 is covered with a face plate 73 provided with an opening 74 for the insertion of a conductor 75 (see Figs. 2 and 6). The opening 74 is suitably formed to allow the operator to clearly View the operation.

In the operation of the mechanism the adjusting nuts 32 are first adjusted to allow the necessary movement of the burning elements 35, which movement is determined from the thickness of the insulation on the conductor, the movement toward each other of the elements 35 being just sullicient to burn through the insulation on the conductor without harming the conductor itself. The circuit of the rheostat is then closed and the current adjusted for the desired amount of heat, which is reached when the elements are heated to a cherry red. The operator then takes the conductor 75 and inserts it within the opening 74 in the face plate 73 and between the elements 35 and thereafterthe operating rod 22 is moved downward by a foot treadle or other suitable means. The movement downward of the rod 22 causes the rectangular shaped heads '39 to move toward each other in a horizontal direction through the cam slots 40 formed in the block 20. This movement of the heads 39 which are secured to the carriages 34 moves the burning elements toward each other and into contact with the insulation upon the conductor 75. The operator upon the elements engaging the conductor gives the conductora slight twist (see Fig. 7) and withdraws it from between the elements 35. The twist burns a groove in the insulation upon the conductor and the withdrawing movement severs and strips the insulation from the end of the conductor. Upon the. release of the operating rod 22 the spring'28 returns the mechanism to its normal position.

Due to the construction of the mechanism heretofore described, the stripping operation may be so rapidly performed that the mechanism maybe used to remove the in sulation from cords having tinsel conductors wound around cotton cores without burning the cotton cores, although'the outer insulation is burned through and stripped from the conductor.

What is-claimed is 1. In a mechanism for removing the insulating covering from a conductor, a pair of non-rotating members, means for moving said members to engage the insulation on the conductor at diametrically opposite points, and means for heating the edges of said members that contact with the insulating covering to burn through said covering, said members constructed and arranged whereby the conductor may be rotated therebetween and moved longitudinally to strip the severed portion from the conductor.

2. In a mechanism for removing the insulating covering from a conductor, a pair of non-rotating members, anelement detachably secured to each of said members, said element constructed of a material which may be heated to a red heat by the passage of an electric current therethrough, and means for moving said members in straight paths 'to bring the heated portions thereof into contact with the insulating covering on the conductor to burn through the said covering. I

3. In a mechanism for removing the insulating covering from a conductor, burning elements oppositely disposed, j carriages therefor, rails upon which said carriages are adapted to move, means for moving said carriages from opposite directions to clamp a conductor between the burning elements carried thereby, and means for heating said burning elements.

4. In a mechanism for removing the insulating covering from a conductor, a pair of non-rotating members, means for moving said members in straight paths into contact with the insulating covering on the conductor, means for heating the edges .of said. members which come in contact with the insulating covering to burn through the said covering, and means for varying the extent of movement of said members to accom-- modate conductors of different sizes.

5. In a machine for removing the insulating covering from a conductor, a plurality of non-rotating clamping jaws, means for heating the clamping edges thereof, means for, moving said jaws toward each other in straight paths to clamp a conductor therebetween, and means adapted to be adjustedto vary the movement of said jaws toward each other whereby the clamping edges thereof may engage different sized conductors.

6. In a mechanism for removing the insulating covering from a conductor, a plurality ofnon-rotating members, means for moving said members into engagement with the, insulating covering on the conductor,

means for heating the edges .of said members which contact with the insulating covering to burn through the said covering, a housing around said members forming a chamher, said housing having .an opening in alignment with the meeting edges of said members, and a\ discharge passage communicating with the chamber to receive the portion of the covering that is stripped from the conductor.

7. In a mechanism for removing. the insulating covering from a conductor, a plurality of non-rotating members, spring means for normally holding said members separated, cam mechanism for moving said members in straight paths into engagement with the insulating covering on the conductor, and means for heating the edges of said members which contact with the 'in. sulating covering on the conductor to burn through the said covering.

8. In a mechanism for removing the insulating covering from a conductor, a pair of non-rotating moving carriages, a burning element mounted on each of said carriages for engaging the insulating covering on opposite sides thereof, operating means including a cam for moving said carriages, and means for varying the movement of said carriages whereby said burning elements may engage different size conductors.

9. In a mechanism for removing the insulating covering from a conductor, nonrotating movable carriages, burning elements, means for supporting said burning elements upon said carriages comprising terminal blocks, current leads for said blocks, insulating means between said terminal blocks and carriages, and means for clamping said leads to said terminal blocks and the whole to said carriages.

10. In a mechanism for removing the insulating covering from conductors, a pair of burning elements non-rotating movable carriages for said elements, means for'supporting said elements upon said carriages comprising a pair of terminal blocks for each of said burning elements and positioned at-the ends thereof, current leads for said blocks, an insulating block between each of said terminal blocks and its respective carriage, and clamping means intermediate each pair of terminal blocks adapted to clamp said current leads to said terminal blocks and the whole to its respective carriage.

In witness whereof, we hereunto subscribe our names this 26th day of October A. 1)., i

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