US2312400A

US2312400A - Combination band pulling and punching tool

Info

Publication number: US2312400A
Application number: US378118A
Authority: US
Inventors: Eimer J Govanus
Original assignee: PUNCH LOK Co
Current assignee: PUNCH LOK Co
Priority date: 1941-02-08
Filing date: 1941-02-08
Publication date: 1943-03-02
Anticipated expiration: 1960-03-02

Description

March 2, 1943. l E. J. GOVANUS 2,312,400

COMBINATION BAND PULLING AND PUNCHING TOOL Filed Feb. 8, 1941 Patented Mar. 2, 1943 COMBINATION BAND PULLING AND PUNCHING TOOL Eimer J. Govanus, Chicago, Ill., assignor `to Punch-Lok Company, Chicago, Ill., a. corporation of Illinois Application February 8, 1941, Serial No. 378,118

6 Claims.

This invention is in the nature of a manually operated tool for pulling and tensioning a metal band and locking it in its tensioned condition to or on an object with which it is engaged. For example, it is common practice to bond together the boards or slats forming the walls of wooden crates by flexible metal bands or straps passed around and nailed to the walls of the crate, in which case the hands or straps should be drawn as tightly as possible around the crate walls to secure the best bonding effect. Again, it is known practice to tighten a rubber hose on an inserted nipple or coupling by coiling a flat soft` metal band around the portion of the hose surrounding the nipple or coupling and drawing the coils tightly together and locking them against re-expansion. A hose clamp of this character forms the subject matter of an application for Letters Patent Filed January 29, 1940 by Charles H. McKee, Serial No. 316,100, and owned by the assignee of the present invention. In the article of this McKee application, the coils of the band making up the clamp are encircled transversely by a collar to the inner limb of which is anchored the innermost coil of the clamp, and, by means of a punch and a hammer or mallet for driving the punch, a lug is offset from the outer limb of the collar into the outer coil of the tightened clamp, the same blow on the punch at the same time offsetting lugs from the outer coil into an intermediate coil or coils, and from the latter into the innermost coil and the inner limb of the collar so that by the internested lugs the coils of the clamp are securely locked against reexpanding.

The tool of my present invention has been designed more particularly, although not exclusively, for use in both tightening and locking the hose clamp of the aforesaid McKee application; and its main contribution to the known art consists in combining with a band pulling or tensioning tool, by which the coils of the clamp are tightened on each other, a punch head and punch mounted on the forward end of the band pulling or tensioning tool that, when the hose clamp has been fully tightened, will directly overlie the collar of the clamp, and, when struck by a. hammer or mallet, will lock the collar and coils of the clamp to each other in the manner above described, against re-expanding. This improvement substantially facilitates the work of tightening and locking the clamp, and saves time, because it can readily be accomplished by one workman, whereas the former method required two,-one to operate the band pulling and tensioning tool, and the other to correctly position and drive the punch.

A further improvement, forming an optional part of my present invention, consists of an adapter by which the tool may be converted from a portable tool to a bench type tool that facilitates its operation, insures the correct application of the tool to the work, and saves time. This adapter consists of a tool supporting and positioning plate that is attached by screws or otherwise to the bench and is equipped at one end with means for pivotally mounting the rear end of the tool thereon and at its other end with an anvil to position and seat the coiled clamp or other portion of the band to be punched directly beneath the punch.

A practical and approved embodiment of the present invention is illustrated in the accompanying drawing, in which- Fig. 1 is a side elevation showing the tool and work mounted on an adapter, with the hand lever thrown upwardly and forwardly and the punch head and punch in elevated position.

Fig. 2 is a vertical longitudinal section through the tool, work and adapter shown in Fig. 1, and showing the band gripping dog in raised position to allow the passage therebeneath of the portion of the band to be gripped by the dog.

Fig. 3 is a similar longitudinal section showing the hand lever lowered, the dog engaged with the band and exerting a pull on the latter, and the pusher nose of the tool in thrust engagement with the top member of the clamp collar, and the tool ready for the punching operation.

Fig. 4 is a view similar to Fig. 3, illustrating the locking eil'ect on the hose clamp caused by a hammer blow on the punch head.

Fig. 5 is a transverse vertical section taken on the line 5--5 of Fig. 4.

In the drawing I have shown the tool applied to the tightening and locking of a hose clamp, such as forms the subject matter of the aforesaid McKee application. Briefly describing this hoseclamp, A designates the hose and B a metal nipple or hose coupling inserted in the hose. The clamp is made from a length of a pliable metal band. One portion of this band is wound on itself to form a two-ply ring C of slightly larger diameter than the hose A to which it is applied. The plies or coils of the ring C include outer and inner lapped end portions with the intermediate ply or coil lying between them. From a section of the same band there is formed a rectangular collar D that transversely embraces the lapped end portions and the intermediate coil. The lapped end of the inner coil is bent backwardly on itself forming a hook E that anchors the inner coil to the inner limb of lthe collar D which it embraces, and continuous With the outer coil is a straight tangential extension F, that passes under the outer limb of the collar, and is engaged by. the pulling and punching tool.

In order that my present improvements may be clearly understood, I will first describe the main structural features of that portion of the tool which effects the pulling and tensioning of the band. i

The body member or frame comprises a round straight member I and a casting II into the lower portion of which the inner end of member I0 is tightly driven. The upper portion of this casting is of channel shape in cross section, and the iiat top surface of the lower solid portion forms in part a slideway for the portion of the band inserted into the tool. Pivoted on a cross pin I2 mounted in and between the side walls of the channel casting II is a yoke I3, and between the arms of said yoke and also pivoted on the pin I2 is a pusher nose I 4, the lower front edge of which abuts against the upper limb of the collar D of the hose clamp when the band is being tensloned.

Slidable on the body member I0 is a puller housing I5 the upper portion of which is longitudinally channeled, and pivoted ona cross pin I6`within the channel is the forked upper portion of a dog I1 having band gripping teeth I1 on its lower surface. The dog is normally heldin its working position (Figs. 3 and 4) by a thrust spring I8 encircling a short lever arm `I9 the lower end of which is articulated in the dog, and the upper end of which is coiled at 20 around a fulcrum pin 2I in the upper rear portion of the puller housing I5, and continuous with the coils is a rearwardly extending loop-shaped lever arm 22, by depressing which by the thumb or palm of the operators-hand the dog may be raised. ,The spring I8 is conned between upper and

lower washers

23 and 24 loosely mounted on the lever arm I9.

A hand lever, by which a pull on the band is exerted through the dog, comprises a straight `round bar or rod 25 equipped with a knob 26 on its free end, its other end being tightly tted into the solid portion of a forked casting 21 that is pivoted on a cross pin 28 mounted in and between the sides of the upper forked vportion of the casting I I .y A link 29 mounted at one end on a pin 30 extending acrossV the fork of the casting 21 and' at its other end on the pin I6 between the limbs of the fork of the dog I1 transmits movement in both directions from hand lever to the puller housing I5 `along the body member I0. The top surface of the lower porf tion of the puller housing I5 is at and is alined with, and forms in ei'ect a continuation of, the top flat surface of the casting II for the purpose of providing a support and slideway for the band.

Between the top of the pusher nose I4 and the transverse top limb of the yoke I3 is a thrust spring 3| that normally maintains the front end 4of thev pusher nose lowered, closing the frontv 55, housing I 5 forwardly, and the latter, striking the of thev hand lever is formed with 1 and 2, strikes a tail 33 on the pusher nose I4 and thus tilts the forward end of the latter upwardly, as shown in Fig. 2, sutliciently to permit entrance of the band extension F therebeneath, to the slideway. When the hand lever is lowered, the spring 3| holds the front end of the pusher nose in thrust engagement with the collar of the hose clamp, as shown in Figs. 3 and 4.

The band tensioning tool as thus rfar described, is a known commercial article, and no claim to the same, per se, is made herein. A

Coming now to a description of my presen improvements, 34 designates a punch head cast with a pair of rearwardly extending arms 35 that straddle the upper channeled portion of the casting II and are pivotally supported on the ends of thev transverse pin 23. The punch head 34 overhangs the front end of the band pulling and tensioning tool above described and is formed in its lower portion with 'a vertical socket 38 into which is fitted a hardened steel pointed punch 31. In the front wall of the head 34 is a tapped hole that receives a set screw 38 to hold the punch in the head; and throughtthe top of the head is a smaller hole 39 to receive a tool for dislodging a worn punch from the socket after the set screw 33 has been backed off. As will be readilyseen, the point of the punch 31 directly overlies the center of the outer transverse limb of the hose clamp collar D, and whenA the'hand lever is in its lowered position the point of the punch restson the clamp collar, as shown in Fig. 3. The lower rear endsof the Varms35 of the punch head are slightly extended rearwardly in the form of lugs 40 that when thehandv lever is thrown upwardly and forwardly, vas shown in Figs. 1 and 2, are struck by the forward end of the puller housing VI5`so as to vswing the punch head and punch upwardly to the positionshown in Figs. l and 2, to facilitate the insertionI of the tangential band extension F into the tool, ,at which timethe operating lever of the dog I1 is manipulated to raise the dog above the path of the band extension.V i

The tool as thus far described is complete as `a portable hand tool, and its operation as an pressing the rear end of the dog raising lever by the thumb or palm of the same hand, and he then with the other hand throws hand lever rod 25 to the upward and forward position shown in Figs. 1 and 2. This` operation draws the puller lugs 40 tilts the punch head and punch upwardly out of the way of the entrance end of the band slideway. At the same time, the hand lever casting 21, through the cooperating lugs 32 and 3l, tilts the pusherA nose I4 upwardly out of the way of the tangential band extension F.v The band extension F is then inserted to `a point where it passes beneath and beyond the dog I1. The dog lever arm 22 is then raisedlowering the dog onto the band, and the hand lever 25 is swung rearwardly and downwardly. This,'through the link 29 forces the puller housing I5 and the dog rearwardly, creating a rearward pull on the band and thus tightening the coils of the hose clamp on each other. This manipulation of the hand lever 25 may be repeatedvseveral times if necessaryyto. fully` tightenthe coils of the hose clamp.

, The backward movement of the puller housing I5 allows the punch head to drop'with the point of the punch resting directly on the upper limb of the clamp collar D. With a hammer or mallet the operator then strikes the punch head, and the point of the punch offsets a series of lugs from the upper limb of the clamp collar and the underlying coils into internested relation with each other, as shown in Fig. 4, which eiectively locks the coils against re-expansion. With the locked coil and hose in one hand and the tool in the other, the operator then gives the clamp and the tool an up and down see-saw motion which breaks the band at the pusher nose of the tool; and then, by elevating the dog, the waste strip E may be pulled out and discarded.

'I'he adapter` device for converting the portable too1 into a bench type tool comprises, as herein shown, a flat rectangular plate 4|, of slightly greater length than that of the tool, on the rear end of which plate aresecured, as by screws 42, a pair of opposed mating brackets 43, integral with the upper ends of which brackets are axially alined bearings 44,. said bearings being adapted to receive the end portion of a trunnion bar 45 that is mounted on and crosswise of the rear end of the body member l of the tool, whereby the latter can be swung up and down vertically. The two brackets 43 are centrally united by a clamp bolt 46 and wing nut 41. Mounted on the other end oi' the plate 4I is an anvil member designed to accurately position and support the work, such as the metal clamping ringl C. This anvil member, as herein shown, comprises a solid block 48 cast with base flanges 49 on its opposite sides, each of these flanges being formed with a longitudinal slot 50 through which extends a fastening screw 5| entering a tapped hole 52 in the plate 4I. This means for fastening the anvil to the plate permits a limited adjustment of the anvil lengthwise of the plate to accommodate tools of different lengths. Where the anvil is intended to center and seat a round object, such as the hose clamp C, its upper surface is preferably formed with a shallow V- shaped notch 53, as herein shown.

The use of this adapter considerably facilitates the accurate application of the tool to the work, and it also prevents the necessity of the workman finding an adequate support for the work to be punched before eiecting the punching by a hammer blow on the punch head. However, the band pulling and punching tool is entirely operable, independently of the presence or absence of this adapter.

Minor variations and modifications in the structural details of the invention herein illustrated and described may be resorted to within the scope and coverage of the claims.

I claimt:

l. In a portable tool for tensioning a metal band and locking it in tensioned condition, the combination with a body member equipped with a longitudinal band slideway open at the front end of said body member for the insertion of the band, a band grip, and means for moving said grip lengthwise of said slideway to tension the band, of a punch head pivoted on and overhanging the front end of said body member and in its fully lowered position covering the entrance end of said slideway, a pointed punch mounted in said head adapted to offset a lugrom the tensioned band into an anchorage member under a hammer blow on said head, and a member slidable on said body member operative, through contact with said head, to raise the latter suiliclently to uncover the entrance end of said slideway for the insertion of the band.

2. In a portable tool for tensioning a metal band and locking it in tensioned condition, the combination with a body member equipped with a longitudinal band slideway open at the front end of said body member for the insertion of the band, a puller housing slidable on said body member, a band gripping dog pivoted on said housing, a punch head pivotally mounted on and overhanging the front end of said body member and in its fully loweredpposition covering the entrance end of said slideway, a pointed punch mounted in said head, a hand lever pivoted on the forward end of said body member, and a link connecting said hand lever to said puller housing through which, when said hand lever is swung upwardly, said puller housing through contact with said punch head raises the latter suilciently to uncover the entrance end of said slideway.

3. An embodiment of the subject-matter defined in claim 2, wherein the punch head is formed with a pair of rearwardly extending arms pivoted on the forward end of the body member, and the lower rear ends of said arms are contacted by the puller housing to raise the punch head.

4. In a portable tool for tightening coils of a metal band on each other and locking them against expansion, the combination of a body member equipped with means for gripping a straight portion of the band extending tangentially of the outer coil and with means for exerting a pull, through said gripping means, on said tangential portion to thereby tighten the coils on each other, a punch head pivotally mounted on and overhanging the forward end of said body member and carrying a punch adapted to overlie the outermost coil and to offset portions of said coils into each other under a hammer blow on said head, and means for converting said tool from a portable too1 to a bench type tool, comprising a flat plate adapted to be secured on a bench, means for pivotally mounting the rear end of the tool on one end of said plate, and an anvil on the other end of said plate formed in its upper side with a V-shaped notch to position and seat the coiled portion of the band directly beneath the punch.

5. In a tool for tensioning a metal band and locking it in tensioned condition, the combination with a, body member equipped with a band grip and means for moving said grip lengthwise of said body member to tension the band, of a punch head pivoted on and overhanging the forward end of said body member and carrying a punch adapted to oiset a lug from the tensioned band into an anchorage member under a hammer blow on said head, and means for converting said tool from a portable too1 to a bench type tool, comprising a flat plate adapted to be secured on a bench, means for pivotally mounting the rear end of said tool on one end of said plate, and an anvil on the other end of said plate to support the portion of the band operated on by said punch.

6. A tool for tensioning and locking a metal band around an article, the band comprising a strap coiled around the article with one end portion of the strap extended into overlapping relation to the other end portion thereof, and a sealing element initially disposed adjacent one end of the strap and anchored thereto to prevent displacement of the sealing element by movement thereof longitudinally of the strap off said end thereof, the tool comprising a member for receiving a portion of said strap and a. means for engaging the sealing element thereon to hold the same and the adjacent end portion of the band in substantially xed positionv relative to the tool, means movably supported on said `member for gripping the other end portion of the band, means for moving said gripping means relative to said member in a direction to ten- 10 sion the band around the article, a punch mounted on the tool so as to be movable in a predetermined path of travel relative to said member and transversely of the normal plane of the sealing element, said punch being adapted to be driven into said sealing element and the overlapped portions of the tensioned band to produce interlocking offsets therein, whereby the vband is locked in tensioned condition.

EINER J. GOVANUS.