US2213841A - Hacksaw blade mounting - Google Patents

Description

Sept. 3, 1940. Q'HUBEQK 2,213,841

HACKSAW BLAD E MOUNTING Filed July 14, 1938 WK. 4 2 e3 61 /4 INVENTOR 67/4,? E5 HUBE'CIF ATTORNEY Patented Sept. 3, 1940 EJNETE OEQE 6 Claims.

This invention relates to what are commonly referred to as hacksaws and particularly to devices of this kind employing means for detachably supporting blades of different kinds and lengths in connection therewith; and the object of the invention is to provide an improved device or pair of devices adapted for mounting in hacksaws of the type and kind under consideration as now constructed so as to provide asimplified means for adjusting the blade into different positions with respect to the supporting frame or mounting to adapt the tool to different uses and more particularly to the provision of a device of the kind described which might be regarded as a replacement part for other devices of this kind which do not employ the simplified features herein set forth; a further object of the invention being to provide a device of the character described wherein adjustments of the blade may be made without removing the blade supporting devices proper from the supporting frame and whereby such adjustments may be quickly and easily accomplished; and with these and other objects in view, the invention consists in a device of the class and for the purpose specified which is simple in construction, efiicient in use, and which is constructed as more fully hereinafter described and claimed.

The invention is fully disclosed in the following specification, of which the accompanying drawing forms a part, in which the separate parts of my improvement are designated by suitable reference characters in each of the views, and in which:

Fig. 1 is a side and sectional View showing one form of my improved blade mounting in connection with one standard type of frame.

Fig. 1a is a side view illustrating the form of my invention shown in Fig. 1 in connection with another standard type of hacksaw frame.

Fig. 2 is an enlarged sectional view on the line 2-2 of Fig. 1.

Fig. 3 is a section on the line 3-3 of Fig. 1, omitting part of the construction.

Fig. 4 is a view similar to Fig. 1, showing a modified form of device and omitting part of the construction.

Fig. 5 is a sectional detail view of another form 50 of construction which I employ; and,

Fig. 6 is a side and sectional view of another form of construction.

In Fig. 1 of the drawing, I have shown for the purpose of illustrating one method of carrying my invention into effect, a hacksaw frame i0 consisting of two angular end portions II and i2; these end portions having conventional means it for detachably coupling the crosshead portions thereof in adjusting the frame to accommodate blades I l of different lengths. The 5 L-shaped parts it and E2 of the frame usually terminate at their ends in angular bearing portions or sockets it, it, respectively; and while there are many types and kinds of hacksaw frames, there are two conventional types which are extensively used. One type includes a handle portion H, such as shown in Fig. 1 of the drawing, which extends outwardly from one end of the frame Hi. There are other commonly used so-called pistol grip frames. The grip end portion of one of these frames is shown in Fig. la of the drawing. The frame proper lUa is substantially the same as the frame it of Fig. 1, but is provided between one angular end portion i la. and the crosshead 33a thereof with a grip 20 portion l3 secured thereto by suitable means, as

by rivets 119.

At this time it is well to state that it is one of the features of my invention to provide a blade coupling and adjusting part or device which is 25 universally adaptable to the standard types of frames which are in common use so that this device may be sold as a replacement part or parts to be substituted for the conventional blade supporting means commonly employed. The common blade supporting means which are in use, however, require intricate adjustments or necessitate the entire removal of the blade supporting part in order to change the angularity of the blade in the frame; whereasmy 35 improved device will accomplish the desired result without removing the blade supporting device from the frame, and in fact, without removing any of' the parts of the complete assemblage.

In Figs. 1, 2 and 3 of the drawing, the device consists of a main device 2% and an auxiliary part M of such device. The device 23 comprises an elongated tube or sleeve 22, the end portion 23 of which is square in cross-sectional form to seat in the square bearing it as will appear on a consideration of Fig. 3. It will be understoodthat in this figure part of the structure of the handle ll has been removed for the purpose of clearly illustrating the bearing l5 as described. The squared end 23 terminates on its outer end in an enlarged head 24 which limits outward movement of the device 28 with respect to the bearing It. The other end portion of the tube 22 is threaded as seen at 25 so as to engage the usual threaded ferrule Ha constituting part of the handle ll as in the usual construction. In other words, the thread 25 will be standard to meet the standard construction of such handles when the device is intended for sale as a replacement or substitute part.

Slidably mounted inthe tube 22 is a pin or rod 26 having an enlarged portion 2? adjacent the inner end thereof fitting in an enlarged portion in the bore of the tube so as to operate upon a spring 28, the spring normally urging the pin 26 inwardly. The inner end of the pin is provided with a coupling head 29 which is in the form of a cylinder which is cut away to the center thereof as seen at 38 forming a blade receiving socket. This socket is bounded on one wall by an inwardly protruding hook 3! which forms a means for retaining the blade id against accidental displacement when the parts of the device are'loosened for the adjustment of the blade. The head 29 is provided with a pin 32 which extends into the socket 3% so as to engage an aperture I la. in the end of the blade Hi. With this type of construction, it will be understood that the blade it will require slight fiexure for attaching and detaching the same with the coupling head 29. In the construction shown in Figs 1 to 3 inclusive, the outer end .of the pin, is threaded as seen at 33. Mounted on this threaded end is a ratchet sleeve 36 which is also preferably keyed to the pin or rod 26 by a transverse pin 35.. The ratchet 3% is also externally threaded to correspond with the threads of the tube 22 so that the entire device is free to enter the ferrule Ila.

The inner surface of the ratchet 34 is provided with circumferentially spaced teeth adapted to register with corresponding teeth formed in the outer end of the tube 22 as indicated at 36 so that the pin Ed is free to be rotated in one direction but will be retained against rotation in the opposite direction. The other part 2! of the complete device is in the form of a round pin 3i which fits freely in the bearing or socket l6 and is provided at its outer end with a head 38 seating upon the bearing to limit inward movement of the pin. The pin 3? has a coupling portion 39 which corresponds to the coupling head 28 in every respect so as to mount the other end of the blade M. The head 38 may also be provided on the inner surface thereof with circumferentialy spaced beveled teeth 38a which will aid in retaining the pin 3? in different positions of adjustment while the blade is under tension and which will permit free rotation of the pin in the adjustment of the blade when the tension on the blade is relieved.

In the use of the device described, it will be understood that the handle ll operates to support the blade it under tension within the frame; the ferrule Ila drawing the device Bil outwardly in accomplishing this result in the operation of tightening the handle. However, when it is desirable to adjust the blade into different positions or to remove a blade and substitute a new or other type and kind of blade, the handle ii is loosened by screwing the same outwardly. This operation will permit inward movement of the device 2% thus loosening the blade It; and when so loosened adjustment may be provided by simply rotating the coupling 29 to bring the blade in the desired position. In this rotary movement, the ratchet sleeve 3d will simply snap over the teeth on the tube 22 until the blade is in proper position, the Spacing of the teeth being such as to provide any desired angularity of the blade, four differ ent positions being illustrated in the accompanying drawing. However, any number of positions may be provided. After the desired adjustment of the blade has been made or after a new blade has ben substituted, the handle ll may be again rotated so as to tighten the blade in the usual manner. It will be understood that no rotary movement is transmitted to the coupling 29 in this operation, and no rotary movement is transmitted to the tube 22 but this tube will move outwarly in the bearing it. In the above adjustment of the blade, it will be understood-that the associated part 2! will be correspondingly rotated, the handle being sufficiently loosened to compensate for the movement of the parts.

In Fig. 1a a pistol grip frame has been shown as provided in the socket i511, thereof with the same adjusting device 2% as is shown in Fig. 1. In Fig. 1a., however, a suitable nut ilia is employed in place of the ferrule ll'a of the handle ll shown in Fig. 1 as the means for tightening the device 26 together with the blade it in the frame. The nut 49a is preferably of knurled type, but may be of the wing-nut or other suitable type in accordance with conventional practices. The operation of the device as applied to the pistol grip frame is exactly the same as previously described in connection with Figs. 1 to 3.

The device as disclosed in Figs. 4 to 6 inclusive is adapted for use in connection with a hacksaw of the pistol grip type. With this-type of construction, the blade Ml or the coupling 29 may be rotated when the nut 40 is loosened or the ratchet 3% may be rotated by hand engagement to adjust the blade. However, it is preferred that a supplemental nut such as shown at M in Fig. 5 of the drawing be employed in such cases; this nut being attachable and detachable with respect to the ratchet 3%. An inturnedflange Ma is provided on the nut to limit inward movement thereof.

In this connection another adaptation of the device primarily for use in the pistol grip type of frame is shown in Fig. 6 of the drawing, wherein an operating knob Z2 is disclosed which consists of an enlarged knurled head 63 and a sleeve portion i l having ratchet teeth t5 similar to the teeth employed on the sleeve 3@. In other words, with this construction, two parts will be formed integrally and the outer end of the pin 26a which is otherwise similar to the pin 255 will be unthreaded. The knob 22 will be either, driven onto the pin 26a or secured thereto by a set screw indicated at at. In the structure shown in Fig. 6, the nut 40 is also illustrated as arranged upon the threaded portion of the tube 22; the latter being identical with the structure shown in the other figures.

In Fig. i of the drawing, the device is shown on an enlarged scale with the tube 22 in elevation. The device in this construction differs from that shown in Figs. 1 to '3 inclusive simply in substituting for the externally threaded ratchet 34, a ratchet 34a having a plain or angular end 34?), which would form a finger piece facilitating rotation of the blade. It will be understood, however, that in any case the blade itself or the coupling 29 may be directly rotated. With this type of construction and by virtue of the reduced size of the ratchet 34, the same is free to pass into the handle I? without engaging the threads of the ferrule Ha. At the same time attachment and detachment of the nut 40 will be permitted without the need of uncoupling the ratchet 34a from the pin 26.

All of the forms shown will be adaptable for use in conjunction with tools of the standard or conventional constructions with the exception of the structure shown in Fig. 5, which is adapted primarily for the pistol grip type of tool. It will be understood in this connection that the structure of Fg. while being adapted for the pistol grip tool can also be used in the other types of tools by simply removing the nut M. In this structure, it is also to be noted that a plain pin 26:: such as shown in Fig. 6 is also used, and the ratchet 3 2 is secured to the pin by a transverse key pin 35a similar to the pin 35.

It will be understood that while certain embodiments of my invention are illustrated in the accompanying drawing, other changes in the specific form of the respective parts of the device may be made, especially in adapting the same to special. types 01 hacksaw frames. However, in the respective uses of the device, it is my intention to provide a tool mounting means for any type or kind of frame which will permit of the adjustment or replacement of the tool without detaching the tool engaging means from the frame and also in providing a quick and simple means for performing the desired function.

It will be understood that in the movement of the blade into taut position, the tightening of the ferrule ll or the nut 48 operates to draw the sleeve 22 outwardly in the bearing or socket l5. In this outward movement, the'outer ratchet end of the sleeve engages the ratchet on the pin and thus operates to draw the pin including the couplin head 29 thereof outwardly. When the blade is in its taut or clamped position, the ratchet prevents rotary movement of the pin and the coupling 29. It will be apparent that the setting of the ratchet will maintain the proper alinement of the blade in the frame with the teeth of the blade extending in the proper direction. In this manner, it will also be noted that in loosening the device for adjustment and otherwise, it is only sufilclent to provide for the free movement of the ratchet to rotate the pin carrying the coupling 29, and of course sumcient to permit rotation of the pin 37.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent. is:

1. An attachment for a conventional hacksaw frame providing for the adjustment and replacem nt of a blade without removing the attachmerit from said frame, said attachment comprising an elongated threaded sleeve, predetermined external wall portions of said sleeve being flattened for keying the same in one part of said frame to permit longitudinal movement only of the sleeve therein, threaded means on said sleeve operatlvely bearing against said frame for controlling the longitudinal movement of said sleeve, a blade coupling element rotatable and longitudinally movable in the sleeve, a coupling memher at one end of said element for attaching one end of a blade therewith, ratchet means at the other end of said element engaging corresponding ratchet means on said sleeve, a spring holding the ratchet means on said element and sleeve in resilient engagement, the shape of said ratchet means being such that said spring in conjunction with said ratchet means prevents rotary movement of said element in one direction while permitting rotary movement thereof in the other direction when said threaded means has been moved to a position out of engagement with said frame.

2. An attachment for hacksaw blade frames providing adjustment and replacement of a blade without removing the attachment from the frame, said attachment comprising an elongated threaded sleeve, means for keying the sleeve in one part of the frame to permit longitudinal movement only of the sleeve therein, movable threaded means on said sleeve having a shoulder thereon adapted to bear against said part of the frame, a blade coupling element supported in said sleeve for longitudinal and rotary movement with respect thereto, a coupling member at one end of said element for attaching one end of a blade therewith, resilient means between said sleeve and coupling element for normally urging said element in the direction of said coupling member, cooperating ratchet means at the other end of said element and on said sleeve, said ratchet means supported in yieldable engagement by said resilient means, and said ratchet means being supported in positive engagement when a blade is supported in taut position by firm engagement of the shoulder on said sleeve with said frame.

3. A blade supporting device for a hacksaw frame of the class described having rotatable blade engaging means at one end thereof, said device including a threaded sleeve adapted to be slidably keyed in the opposed end of the frame, a blade engaging member extending through said sleeve, blade engaging means at one end of said member, enlarged means at the other end of said member adapted to register with corresponding means on the end of said sleeve in predetermined positions of rotation of said member with respect to said sleeve, means disposed between said sleeve and blade engaging member adapted to resiliently urge said sleeve in the direction of the enlarged means on said member, and adjustable means on said sleeve cooperating with said frame for independently urging said sleeve in the direction of the enlarged end of said member in the ope-ration of firmly supporting a blade in said frame.

4. In combination with a hacksaw frame of the character described means for detachably and adjustably mounting blades in said frame without detaching said means therefrom, said means comprising a freely rotatable member in one part of the frame having means for engaging one end of a blade, and a device comprising an externally threaded sleeve slidably and nonrotatably supported in another part of the frame, a blade coupling member having means at one end thereof for engaging the other end of the blade, said blade coupling member being rotatable in said sleeve and relatively movable longitudinally thereof and of said last named part of the frame, an enlarged portion at the other end of said coupling member and cooperating with said sleeve for limiting movement of said sleeve in the direction of said enlarged portion, adjustable means on said sleeve and cooperating with said last named part of the frame for moving said sleeve into firm engagement with the enlarged portion of said coupling member and for collectively moving said sleeve and member in the direction of said enlarged end to tighten the blade in the frame, and means for locking the coupling member against rotation with respect to the sleeve when the blade is supported in taut position.

5. In a hacksaw frame having rotatable means at one end portion thereof for engaging one end of a blade, an attachment for the other end por- ;tion of said frame providing for rotary adjustment and replacement of the blade Without removing the attachment from the frame, said attachment comprising an elongated threaded sleeve, means for keying the sleeve in said last named portion of the frame against relative rotation while permitting longitudinal movement of the sleeve therein, a blade coupling element rotatable in said sleeve and relatively movable longitudinally thereof and of said portion of the frame, a coupling member at one end of said element for engaging the other end of the blade, ratchet means at the other end of said element engaging corresponding ratchet means on said sleeve to prevent rotation of the element when the blade is supported in taut position, said ratchet means forming stop shoulders limiting the relative longitudinal movement of said sleeve and element, movable threaded means on said sleeve forming a shoulder thereon abutting the outer end of said last named portion of the frame, and said movable threaded means through said sleeve and stop shoulders controlling the longitudinal movement of said sleeve and element relative to said part of the frame in the operations of tightening and loosening the blade supported therein.

6. A blade supporting device for conventional hacksaw frames of the class described, said device comprising a blade coupling element having a blade coupling member at one end thereof, means at the other end of said element for controlling rotary movement of said element, means slidably arranged in the frame for supporting the element, an adjustable member on said last named means and abutting the frame for controlling relative movement of said means in the frame, said first named means comprising a ratchet adapted to engage corresponding ratchet means on said element supporting means, and said ratchet also forming a stop shoulder adapted to communicate to said coupling element the longitudinal movement imparted to said supporting means by said adjustable member.

CHARLES HUBECK.

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