US2944335A - Device for widening pipes, tubes, spouts or the like made of rubber, synthetic rubber, or artificial resilient material - Google Patents

Description

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DEVICE FOR WIDENING PI LIKE MADE OF RUBBER,

.ARTIFICIAL RES Filed Oct. 14, 1957 3 Sheets-Sheet 1 M AM! Inventor:

2,944,335 OR THE 0 RUBBER. OR

ERIAL July 12, 1960 KABEL DEVICE FOR WIDENING PIPES, TUBES, SPOUTS LIKE MADE OF RUBBER, SYNTHE ARTIFICIAL RESILIENT Filed Oct. 14, 1957 3 Sheets-Sheet 2 Inventor? 2,944,335 OR THE BER. OR AL H. KABEL DEVICE FOR WIDENING PIP TUBES, SPOUTS LIKE M RUBBER NTHETIC RUB L R ENT MATERI ADE 0F 4 ARTIFICIA ESILI July 12, 1960 3 Sheets-Sheet 3 Filed Oct. l4 1957 trite RUBBER, OR ARTIFICIAL RESILIENT MATE- Patented July 1 2,. 1960 Heinrich Kabe], Hamburg-Stellingen, Germany, assignor to Paul Hellermann, trading as Paul Hellermann Fabrik Elektrotechnischer Spezialartikel, a German firm known in the form of so-called three-triblet pliers-r These consist in principle of two two-armedrlevers eachiofwhich carries a triblet and. whichcan swing about a-cornmon fulcrum pin, as well as of a drawarmwhich'carries the other pliers'shank firmly. fixed to its grip shank, is swung outwards by the movement of this grip shank.

According to one embodiment, the centre axis of the.

pivots of both pliers .shanks and the centre axis ofthe stationary prising triblet, lie in a straight line. However, differing therefrom, the arrangement may be such that only the two axes of rotation of the pliers shanks lie in a straight line, whilst the centre axis of the fixed prising triblet is placed outside, in particular over, this line.

In order that the widening may not be done by feeling, whereby the expansion limit of the material forming the part to be widened, might readily be exceeded, and faster wot-king with the device be obtained, by a further development of this invention there is a limit to the opening width, which inay be altered according to the particular 5 requirements, with the aid of an adjustable stop. For this openings in the head of. the pliers. According to the" "opening in which this stop pin is found in the head ofithe pliers, one or the other cut-out of'the lever strikes against the pm when the device is operated, whereby the opening third triblet and moves in. the downward direction when the'pliers are operated.

. The disadvantageof these known hand pliers consists in. that.the.sha-nksof thepliers servingas hand grips,

.must be so far prised apart, that spanning; with thehand,

especially for women, entails.some diificulties. r 5

A further disadvantage is, thatowing to the lengthofv the .force-exerting arm; in-relation-to' thelength of the loadetaking arm, relatively great muscularf force -is are! quired to operate the pliers for the purposelof widening spouts-and the like; Wi th continuous. mass; production work, the hand and arm muscleslmay tire..- pressure. to be exertedon the shanks of,th'epliers, needed towiden the spouts and the like, isiofteribeyond}the power of women, and women arev mostly enga eqjgpn such work.

If the shanks of't'he pliers are made shorter, 'to relieve the muscular force needed for the work, then, corresponding to. the known rule in mechanicsthat the gain. in force is lost in progress, the triblets are not prised apart .sufiiciently.

To the disadvantages mentioned must beadded .the fact that-in the known three-triblet pliers, sliding parts are pro vided, especially the part carryingthe downward-moving triblet and which serves as draw-bar. On widening the spouts this part is greatlysubject to bending stress and to considerable unilateral forces, so that there is danger of warping and thus of jamming in the slide; Moreover, more friction occurs substantially, than with rotating parts. Then, greter force is required'to operate the pliers.

The disadvantages outlined are overcome by means of the present invention, with the arrangement which above all, ditfers from the constructions already known in that the shanks of the pliers which carry the two triblets for prising are connected by an' intermediate transmission which moves them into the prised position upon the closing movement of the grip-shanks of the pliers.

The device does not require to be made as pliers or purpose the thrust lever connecting the two pliers-shanks I articulated together, is provided with several cut-outs for a stop pin serving for limiting the width of opening and able to be inserted according to choice into correspondingwidth is limited. t The arrangement in co'nformitywith'this invention as.

compared with arrangements previously known has above all, the following advantages:

n (1) Less muscular force is required forthe operating. (2) There. are no sliding parts. All highly-stressed parts are rotatable, so that bending, aswith the drawbar of the known three-triblet pliers, cannot occur.

(3). Pliers madeaccording to this invention fit easily in the hand.

(4) The stroke limitation is effected quickly and simply. The means required forthis do not complicate the construction at all. l v y I j Further details and furtheradvantages of this invention result from the following description of the embodiment by way of example shown in the drawing. Therein:

Figs. 1 and 2 are a side view of a device constructed as hand pliers firstly the triblet pins being closed, and

y then being open:

Figs. 3 to 6 show the top part of the pliers on an enlarged scale and in various positions, partly in elevation,

; partly in section. r

hand pliers but may also be constructed as bench device.

It consists inter alia of a head in which for the construc- 1 tion as hand pliers, two shanks are placed rotatable, each carrying one of the prising triblets. Then one of the i shanks of the pliers is connected articulated through a.

lever, with the grip shank which carries the other pliers shank. This lever serves as thrust lever and presses the pliers shank connected'with it outwards when the grip shanks of the pliers move one against the other; The

,the pliers shank 6.

. shank 3. The two pivots 5, 7 lie in a straight line, as seen from the figures. On this straight line is also found the expanding triblet 8, at a standstill during the working of the pliers, which is connected detachably with the pliers head 4. The two movable expanding triblets 9, 10 are found at the ends of the pliers shanks 3, 6. They are detachably connected with the pliers shanks 3, 6 appertaining thereto. The detachable connection may be made in any desired manner, for example by screws. The triblets 8-10 have round cross-section and advantageously consist of rustless steel.

The pliers shanks 3, 6 are connected articulated by a lever 11 shown in Figs. 3-6. For this purpose the lever 11 is connected by one of its ends through the pivot 12 to the grip 1 and by the other end through the pivot 13 to As further shown in Figs. 3 to 6 the lever 11 has three cut- outs 14, 15, 16. Moreover the pliers head is furs nished with three orifices 17, 18, 19 which serve to take a stroke limiting pin 20. According to the orifice 17 to 19 in which the stroke-limiting pin is inserted, a diiierent opening width of the prising triblets results. The individual positions of the stroke-limiting pin 20 and the opening widths appertaining thereto, of the prising triblets as well as the form and size of the widened spout opening may be seen in Figs. 3 to 6 in Which the spout is designated by T. The stroke-limiting pin 20 is readily interchangeable. For instance it may be screwed by its end into one of the orifices 17 to 19 or may be secured by means of a screw to be screwed in this end or may be fixed in any other manner. Through the stroke limitation any too wide turning of the parts to be widened and any resultant tearing, is prevented.

In addition, the work proceeds faster for the expansion limit no longer needs to be found by feeling for it.

The device works as follows:

The spout T or the like to be widened, with the pliers closed, that is, whenthe prising triblets 8, 9, lie close together, is pushed over the latter. Then the two grips l, 2 are pressed together. Thereby the grip l with the pliers shank 3 placed there, turns about the pivot 7. Thereby the pliers shank 3 moves outwards. I

Upon this rotary movement of the grip l, the lever 11 turns the pliers shank 6 outwards. Consequent upon the described movements of thepliers shanks 3, 6 the prisingtriblets 9, 1% move. apart and away from the stationary triblet 8 found in the pliers head 4.

All the three triblets 8 to 10 form together, according to their distance from each other, the angles of a more or less large triangle as shown in Figs. 36. The triangle formed with small opening of the pliers is isosceles and acute-angles. This shape has the following advantages, when operating the pliers:

The thin cables and leads to be dealt with are variously equipped, before the provision of the rubber spouts, with cable shoes or cable eyelets. Both have a cross-section which projects beyond the circular cross-section of the leads. With an equilateral triangle therefore the spout must. befwidened so far that the cable shoes or eyelets may pass through it. Therefore thespout is then widened to a larger triangle than required for the passage of the corresponding lead without cable shoe. Since the internal diameter of the spouts which must be fixed firmly to the lead through specific tension is adapted to the lead diameter, with the useof the known three triblet pliers which do not have the advantage of widening in isosceles triangle shape, the material of the part to be widened is frequently stressed over and beyond its expansion limit so that often much waste occurs disproportionately.

With further compression of the grips 1, 2 this acuteangled isosceles triangle turns into an equilateral one and with further compression becomes an obtuse-angled isos? celes triangle which ofiers the same advantages as the acute-angled isosceles triangle, namely protection of the parts to be widened against excess stress. Whilst the average pliers-opening is suitable for leads with dimensions which according to experience are rarely furnished with cable shoes or cable eyelets, such as for instance hanging cords, supply leads for table lamps and standard lamps 'as well as household equipment the leads; the diameter This invention is not restricted to the examples illustrated and described. Thus the thrust lever 1-1 may have a different form than the one shown. Also, more or less, than three orifices may be provided for the strokelimiting pin 20 in the pliers head 4. In this case then, also the number of cut-outs which the thrust lever possesses, is correspondingly altered.

Instead of a thrust lever also another intermediate transmission may be provided, for instance a toothed wheel transmission.

I claim:

l. A device for widening tubes, spoutsv and the like of resilient material comprising ahead having a first grip fixed, to said head, pivots onopposite sides 01f said head and' a' fixed triblet on said head between and alinement with said pivots, a shank carrying a triblet pivoted on one of said pivots and extending on the opposite side of said one pivot from said first grip, a second grip pivoted on said other pivot and a shank carrying a triblet fixed on said'second grip and extending on the opposite s'ide of said other pivot from said second grip, a lever pivoted on one of its ends on said second grip, the other end of said lever being pivoted to said pivoted shank, and means on said head cooperating with said lever for. limiting the relative movement of said shanks.

2. A device according to claim 1 in which said movement limiting means includes a stop on said head adapted to contact said lever.

3. A device according to claim 2 in which said stop is a pin held in an orifice in said head.

4. A device according to claim 2 in which said stop is a pin held in an orifice in said head and operating in a slot insaid lever.

5. A device according to claim 1 in which said movement limiting means includes a plurality of orifices spaced apart in said head, and a pin adapted to be inserted alternately in each of said orifices. V

6. Adevice according to claim 1 in which said movement limiting means includes a plurality of orifices spaced apart in said head, and a pin adapted to be inserted alternately in each of said orifices, a plurality of cut-outs on said lever corresponding to said orifices and located at separated points on said lever, said cut-outs adapted to contact said pin.

7. A device according to claim 5 in which said orifices" are in triangular arrangement.

References Cited in the file of this patent UNITED STATES PATENTS 1,806,339 Ferris May 19, 1931

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