US2676630A

US2676630A - Blade retaining construction for hacksaws

Info

Publication number: US2676630A
Application number: US145733A
Authority: US
Inventors: Louis J Furman
Original assignee: Parker Manufacturing Co
Current assignee: Parker Manufacturing Co
Priority date: 1950-02-23
Filing date: 1950-02-23
Publication date: 1954-04-27
Anticipated expiration: 1971-04-27

Description

April 27, 1954 l.. J. FURMAN 2,676,630

BLADE RETAINING CONSTRUCTION FOR HAcKsAws Filed Feb. 265. 195o 36 jizz/mr A 36a, i

gy@ gane, M ne@ Patented Apr. 27, 1954 UNITED STATES PATENT OFFICE BLADE RETAINING CONSTRUCTION FOR HACKSAWS Application February 23, 1950, Serial No. 145,733

7 Claims.

This invention relates to frame saws, more particularly hacksaws, and the object is to provide a simple, inexpensive and effective construction which will prevent the unintentional separation of the blade and possible further separation of the parts of the frame.

My invention will be well understood by reference to the following description taken in connection With the illustrative embodiment thereof shown by way of example in the accompanying drawings, wherein:

Fig. 1 is a side elevation of a hacksaw with the central portion of the frame and blade broken away;

Fig. 2 is an enlarged side elevation of one of the studs by which the blade is secured;

Fig. 3 is an elevation, the plane being at right angles to that in Fig. 2, illustrating the step of attaching the saw blade;

Figs. 4 and 5 are views similar to Fig. 2, showing successive steps in the manufacture of the stud;

Fig. 6 is a View similar to Fig. 3 showing the stud and keeper separated and in a position preliminary to their assembly;

Fig. 7 is an end elevation of the keeper;

Fig. 8 is a side elevation thereof;

Fig. 9 is a view similar to Fig. 8 showing a modied form of keeper; and

Fig. l0 is a section on an enlarged scale substantially on the line Ill-IQ of Fig. 1, the blade being omitted, and showing a stud of the construction disclosed in the patent to Priest and Macomber, 2,166,446, utilized as a part of the novel structure, with the stud turned through an angle of 45 degrees about its lengthwise axis.

In Fig. 1 I show a hacksaw frame of conventional type embodying a main frame member or back i0 to which the handle l2 is attached, and

having a depending arm le to which one end of the blade B is connected and a complementary frame member I6 adjustably telescoping with the back I0, the forward end of which member i6 is downturned to form an arm for securing the other end of the blade. The blade is herein secured to these arms by means of studs lf and l8r at the front and rear of the frame respectively, which studs are in elfect lower end portions of the arms. The ends of these studs have fiattened surfaces 26 against which the blade lies, and from these surfaces project pins 22 which enter the holes in the blade. The studs may be faced several ways and for this purpose have a square portion 2d which fits in a correspondingly shaped hole in the arm of the frame.

The front stud lf has a simple head 26 while in the rear stud l8r the square portion 24 is extended as a shank 28 which is threaded to receive a wing nut 30 by means of which the blade is tensioned. What has been described in this paragraph is not in itself new.

When such a hacksaw is dropped, particularly if it lands on the depending portion of the frame member l 6, there is suflicient spring in the parts so that the blade may jump oli the pins 22 and the parts of the frame itself may become disassembled. In the case of the stud l8r the stud may be inserted in the arm from the left viewing Fig. 1 and if the flattened portion is made wider than the diagonal of the square hole in the arms the stud cannot come out while the nut 36 is in position. The stud l8f, on the contrary, has an integral head 26 and must be inserted from the left and can come out by a reverse movement. If this stud is made in the manner shown in the patent to Priest and Macomber 2,166,446, the separation of this stud is less likely to occur but it may happen. It is sometimes found that saws will become separated during shipment to the dealer, or from the dealer to the consumer.

Reassembly is an expensive nuisance, even if parts are not lost. My invention provides a means for obviating this difliculty and utilizes a suitable keeper assembled with either or both of the studs (most advantageously with the stud lf which has an integral head) which will prevent the blade from jumping off the pins 22.

The keeper (the various parts of which bear the numerals 32 through 36) herein takes the form of an inexpensive clip of bent wire easily assembled with the stud and which requires no extra parts or manufacturing operations to permit its use. Referring to Figs. 7 and 8 the clip is formed of a length oil wire with a doubled central portion which is bent angularly to provide a distal part 32 which in use (see Fig. 3) extends substantially parallel to the at surface 20 of the stud with its distal end, where the wire is doubled, extending closely adjacent to the end of the pin 22. The proximal angularly related arm 313 serves to support the distal arm 62 in this position. At the proximal end of the angular portion, the wire is bent to either side outwardly at right angles to the central plane of the angular portion (see Figs. 7 and 2) providing the portions 36 which rest on the face of the flat surface 20 and extend to its edges. There the terminals of the Wire are inbent to provide portions 38 embracing the stud on either side vand extending,rwith the ends terminating closely adjacent one another, so that the parts 36 and 33 together enclose the two edge portions of the stud holding the keeper clipped thereto in the position shown in Figs. 1, 2 and 3. Preferably the edges of the stud at the margin of the at portion are provided With recesses or grooves lill to seat the Wire (see Figs. 5 and 6).

The words dista-l and proximal are herein used in the ordinary sense, having reference to the point of attachment to the stud by means herein exemplified by the parts @Si and 38.

Preferably the end of the portion 32 does not make contact with or extend over the pin 22, but is spaced therefrom to permit (see Fig. 3) the end of the blade to be slid under the overhanging arm 32 by a movement of approach in an angular direction, as shown in Fig. 3, so that the portion of the blade outward of the hole therein enters underneath the overhanging arm and the hole drops over the pin 22. When the blade is so engaged the arm 32 overhangs the ends of the blade and prevents it from separating by a movement vertical in Fig. 3, or toward the reader in Figs. l and 2.

The wire clip is somewhat resilient and the parte and 38 denne a resiliently distensible opening. The stud may be presented end-V e to this opening, as diagrammatically illustrated in Fig. 5, and thrust into the same. A slight tilting movement exerted on the end of the arm 32 permits the keeper to be sprung over the pin 22 and come to rest engaged in the grooves This assembly is very simple. ft is not easy however casually to remove the clip which ig permanently positioned apart from an operation involving ccnsiderable prying and bending. rThe length of the terminal arms 36 is such as to prevent the clip from being sprung loose Iby a Vertical movement viewing Fig. 3.

Obviously the discontinuity in the clip or keeper need not necessarily be exactly at the middle of the bottom surface of the stud as illustrated provided it presents a portion eifectively embracing the saine to retain it thereon and angular arms corresponding to 32 and 3d. Thus in Fig. 9 I have shown a clip wherein the wire ends oppose one another at the extremity of overhanging arm Eto while the parts Silo and 38a are in the form of split ring from the ends of which the wire extends to form arms 34a. and 32a, the portions of the ring where the parts 35d and 33a join constituting opposed gripping elements embracing the edge portions of the stud at the margins of the flat surface 2b.

The surface of the stud if is preferably formed by cold-forging a piece of round stock. The pin 22 may be integrally extruded from the stool; in this operation. In Fig. 4 I have shown the stud at the end of this forging operation with he resultant flash f which is thereafter trimmed if. ln tiis trimming operation, in which the tud is advanced from the form shown in Fig. 4 to he form shown in Fig. 5, the recesses le are easily ornled. No extra operation is required.

Referring now to Fig. l0 this shows the stud proportioned as in the Priest and Macomber patent already referred to. That portion thereof bounded by the flat surface 2t corresponds in cross sectional area substantially to a half of the square of the opening Il' in arm IS at one side of its diagonal, the width of the flat surface corresponding substantially to the length of the diagonal. lSuch a stud, absent any keeper, can be inserted in the hole when turned to the position shown in Fig. 10. After insertion a clip as de- Hic-PU) scribed may be snapped on. Extra width is provided at the edges by the encircling wire and the total width may exceed the length of the diagonal of the square. Also the arms Edi disposed. nea-r the opposite corner of the square be positioned to engage its sides as shown. The Stud is therefore locked to the arm even when the blade is absent and whatever its angular relation to the opening.

I am aware that the invention may be embodied in other specific forms Without departing from the spirit or essential attributes thereof, and I therefore desire the present embodiment to be considered in all' respect-5 as illustrative and not restrictive, as is in fact clear in several matters from the description itself. Reference is to be had to the appended claims to indicate those principles of the invention exemplified by the particular embodiments described which I desire to secure by Letters Patent.

l. A hacksaw stud for mounting on an arm of the frame to secure the blade having a si rface on which the blade lies, the surface having a pin projecting therefrom to enter the hole in the blade, a keeper mounten on the stud compi ng, first, an angular part which part has one arm. extending upwardly from su ...e and another extending adjacent the end of stud to overlie the end portion of the blade, and, secn ond a gripping portion extending from the l st shaped to embrace and clasp the edge portions of said surface to retain the keeper.

l hacksa'w for mounting on an of the fra-ine to scure the blade having a surface on which the blade lies, the surface having a pin projecting therefrom to enter the hole in the b and a keeper mounted on the comprisi length of wire including a portion to provide two arms, the distal arm extendirf' from near the point of the stud and bei spaced om said surface and the proximal extending from the distal arm toward the surtace, the wire the proximal end of the proximal arm being bent to provide a gripping portion to embrace and clasp the edge portions of said surto retain the keeper.

3. A hacksaw stud for mounting on a the frame to secure the blade a st on which the blade lies, the surface having a pn projecting therefrom to enter the hole in the blade, and a keeper mounted on the stud ocmprising a length of wire including a portion angularly bent to provide two arms, the arm extending from near the point of the stud and being spaced from said surface and the proximal arm extending from the distal toward the surface, the wire at the proximal end of the proximal arm being bent to provide a grip'- ping portion shaped to embrace the edge portions of said surface to retain the keeper, an edge portion being recessed to provide a seat for the gripn ping portion.

4. A hacksaw stud for mounting on an ci the frame to secure the blade having a surface on which the blade lies, the surface a piu projecting therefrom to enter the hole in the blade, and a keeper mounted on the stud oomprising a resiliently yieldable portion defining opening into which the stud may be introdi.. d endwise to assemble the keeper therewith, sai/.l portion resiliently gripping the stud after such assembly, and comprising also an angular portion extending from said first mentioned portion with its distal part extending approximately parallel to said surface and into adj acency to the end of the pin.

5. A blade-retaining keeper for use with a hacksaw stud having a pin to be received in the hole in the blade comprising a length of Wire doubled and angularly bent to provide a distal arm to lie spaced from that surface of the stud which is at the base of the pin with its doubled end adjacent the end of the pin, and to provide also a proximal arm to extend to said surface for supporting the distal arm, the two parts of the wire then extending outwardly from the central plane of said doubled portion to seat on said surface and to extend to the edge of the same, and then being inturned toward each other to embrace the portion of the stud opposite to said surface.

6. A blade-retaining keeper for use with a hacksaw stud having a pin to be received in the hole in the blade comprising a length of wire bent to provide, when viewed from one direction, a substantially closed gure but one having a discontinuity to permit distension of the figure, said iigure including a portion corresponding to the cross section of the stud to embrace and grip the same adjacent the pin, the keeper, when viewed from a direction relatively perpendicular to said one direction, having` an angular portion rising :from said rst mentioned portion where it overlies the face of the stud from which the pin projects, said angular portion providing a distal arm to overhang said face and terminate adjacent the end of the pin.

7. A hacksaw stud having a shank which is passed through an opening in an arm of a hacksaW frame, also having a pin to engage the blade and further having a fixed head to engage the margin of the opening, and a Wire clip having a yielding portion to t about and resiliently grip the cross section of the shank, the clip presenting abutment portions outwardly of the stud to oppose the other side of the margin of the opening, said clip including an angular portion providing a distal arm which lies in overhanging relation to the stud adjacent the pin and terminates adjacent the end of the pin.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,265,341 Keller May 7, 1918 1,277,879 Donnelly Sept. 3, 1918 1,413,348 Parsley Apr. 18, 1922 2,102,782 Blum Dec. 21, 1937 2,166,446 Priest July 18, 1939