US 2017895 A
Description (OCR text may contain errors)
v. Oct. 22, 1935.
J. E. DAVEY SAW HANDLE Filed May 27, 1935 ATTORNEY.
Patented a. 22,
UNITED TATES PATENT. OFFICE This invention relates to blade holding devices, and has among its objects the provision of a simple, inexpensive device; which shall be convenient tooperate, and which shall be com- I pact, durable, and reliable in use.
Another object of the invention is to provide a device as setforth wherein the only movable part shall be the blade; also to provide simple means for holding the blade in different positions; and further to provide a simple blade flexing and hence stifiening and frictlonally securing arrangement. P
Other objects and advantages oi! the invention will become apparent as the specification proceeds.
With the aforesaid objects in view, the invention consists in the novel combinations and arrangements of parts hereinafter described in their preferred embodiments, pointed out in the'subjoined claims, and illustrated in the annexeddrawing, wherein like parts are designated by the same reference characters throughout the several views.
In the drawing:
Figure Us a view in side elevation of a device embodying the invention with parts in dot-dash lines to indicate interchangeability of position.
Fig. 2 is a fragmentary side view of a'blade element of the invention.
Fig. 3 is a diagrammatic view of the blade attaching means in initial position 01' angularly moving the blade to secure the same.
Fig. 4 is a top plan view oi the device shown in Fig. 1, with the blade in difierent positions as indicated in dot-dash lines.
Fig. 5 is a horizontal sectional view taken on line 5-5 of Fig. 1.
Figs. 6, 7, and 8 are enlarged vertical sectional views taken on the respective lines 6-6, 'I- and Til-8 of Fig. 1, and showing the blade in different positions in dot-dash lines.
Fig. 9 is a fragmentary enlarged sectional view indicating particularly the cam hof The advantages of the invention as lined are best realized when all features and instrumentalitiesare combined in one and the same structure, but, useful devices may be produced embodying less .than the whole.
It will be obvious to those skilled in the art to which the invention appertains, that the same may be incorporated in several different constructions. The accompanyi w theremresubmitted merely as showing the Drfened 3 plification oi the invention.
Referring in detail to the drawi g. (1950593 8. device embodyim th lnvemion- The a may include a saw'blade II and a holding means I 2' thereior. The blade may have. a longitudinal closed ended slot l8 spaced from an and N thereof, and a transverse slot I5 opening into the saw edge it of the blade. The slot l5 may have 5 its inner portion l allned with the slot l8 along the median line of the blade, and the slot l5 may have as the center of its radius the central point of the slot l3. The entrance to the slot l5 may include a cam formation at i8, and the slot may 10 lie intermediate the slot l3 and the blade end M.
The holding means l2 may comprise a shank IQ and a handle at an angle thereto and lying in a plane therewith. A projecting trigger like portion 2|;may extendirom the shank in spaced 1 relation to the handle 20 and in the regionof the angle.- The handle may'include a rear projection 22 for bracing the operator's hand. When the latter grips the handle 20, the index finger may encircle the portion 2| and the middle finger may lie in the space 23 so as to bear against the portion Zl-in the direction of sawing.
The shank l 9 may be of generally rectangular form and may have means for securing the blade II at either side as at A, B, or at the top thereof 55 as at C, to facilitate sawing in angles or corners with maximum convenience and without injuring the operators hand. For the same reasons, the blade may be attachable in inverted er reversed positions,-- for example, with the saw edge 58 $9 uppermost or'iaclng toward either side if the blade is at the top. Each securing means may be identical, as the same blade may be held in the different and inverted positions. A description of a holding structure at one side of the shank is will therefore apply to the devices for all positions A, B, and C.
The shank is may include a T-headed stud 2% preferably rigid with theshank and having a stud portion 25 and ahead 28. The part 25 ex- M tends at right angles from a wall or the shank, and the head 26 may be elongated transversely relatively to the shank 19. The underface of the head 26 may be convexed from end to end thereof in the manner of a cam as shown at 21, although it. may be plane adjacent to thestud portion 25. The head 26 is adapted to pass through the slot is and engage over the blade.
. Longitudinally spaced from the member 28, is a holding element or pin 21 extending at right 0 angles irom the face of the shank I9.
Spaced longitudinally trom the pin 21 is a hook like tongue or finger: portion 28 which is rigid with the shank l9 and is nearest the handle ii. The members. 21 and 2d are disposed along a median line of the face of the shank at which they are located.
Intermediate oi" the successive pairs of the members 24, 21 and 28 are cut cuts or openings 29, 30 extending from side to side of the shank l9. Thus cross elements 3!, 32 are formed to which the members 24, 21are secured. The tongue 28 may extend over a part of the opening 30 which forms an undercut therewith and simplifies the casting of the tongue.
The spacing between the members 24 and 21 is greater than that between the slots II and I1, so that upon angularly moving the blade I I about the stud 25, the slot Ii first follows'a path 33 as shown in Fig. 3, and when the cam part l8 engages the pin 21, the blade II is shifted longitudinally rearward so that the stud 2i abuts the forward end of the slot It as shown in Fig. 1. The path 33 may shift at 34 into the path 35, which completes the angular movement for attaching the blade.
The end H! of the blade is round and may have similar cam engagement with the tongue 28 at the inner edge thereof. As the blade is angularly moved, its end is passed under the tongue 28, which holds the same snugly against the shank l9.
In course of the angular movement of the blade, the longitudinal edge portions of the slot it are engaged with increasing force by the cam portions 21 which thus ride over the blade and press the same strongly against the shank IS.
The members 24,- 21, 28 may lie along a longitudinal seat 36 concaved transversely of the shank and being preferably somewhat wider than the blade, and the said members lie along a median line of the seat. Hence the blade ll may be transversely flexed by the cam head 2. into the seat and caused to strongly frictionally grip the seat 36 at the edges of the blade. If blades of different widths are to be secured, a blade of less width may have a narrower slot I! so as to engage further under the cams 21, to be correspondingly forced into the seat, and if the blade be wider, the slot l3 may be made wider for less cam engagement andto be less depressed into the seat and for requisite clearance. Hence the same device may be used to hold blades of different sizes.
The frictional engagement in'the seat a prevents the blade from accidentally angularly mov-- ing into disengagement.
The tongues 28 may be so spaced outward of the seat as to permit the blade to engage thereunder with no, or a desired degree of, blade flexure. The members 24 and 2B cooperate to prevent lateral springing and breakage of the'blade at the handle and to avoid disengagement of the blade from the pin 21.
When secured, the blade is perfectly r gid. and yet it can be attached and detached without moving other parts, and may be engaged in any of the positions A, B, and C, and with the saw edge I6 facing in either direction for each position.
It will be appreciated that various changes and modifications may be made in the device as shown in the drawing, and that the same is submitted in an illustrative and not ln a limiting sense, the scope of the invention being defined in the following claims.
1. A device including a blade having a longitudinal closed ended slot, a transverse slot open at one end, 'a holding means having a stud, said stud having a head adapted to pass through said slot to engage the blade on angular movement thereof and being elongated transversely of the blade and the holding means, and the latter having a pin engageable in the open ended slot upon angular movement'of the blade, said open ended slot having a cam portion to engage the I pin and cause the blade to move longitudinally so that the stud abuts an end of the closed ended slot to rigidly hold the blade in the longitudinal direction.
- 2'.'A device including a blade having a longi- 10 tudinal closed ended slot. a transverse slot open at one end, a holding means having a stud, said stud havinga head adapted to pass through said slot to engage the blade on angular movement thereof and being elongated transversely of the 18 blade and the holding means, and the latter havtudinal closed ended slot, a holding means having a transversely concaved elongated seat. said holding means having means to secure the blade in longitudinally extending relation along said a seat, the securing means including a headed stud. the head of said stud being .elongated transversely of the seat and adapted to pass through the slot to engage over the blade on angular-1y moving the latter into longitudinal relation to the seat, and said head having cam faces on its under side to press the blade against the seat for transversely flexing the blade in the seat to cause the blade to tightly frictionally engage theseat at" the edges of the blade. a
4. A device including a blade having a longi- 4o tudinal closed ended slot, a holding means having a longitudinal concave seat, the blade being of less width than the seat and being adapted to' be transversely flexed into the seat, the holding means having a rigid T-shapedstud projecting is from the seat with the head of the stud extending transversely of the seat and adapted to engage the blade through the slot thereof on angu- -lar movement of the blade, said head having its under side convexed from end to end to consti- 50 tute a cam for pressing the blade into flexed seating relation in the seat, and means longitudinally spaced from the stud and connected to the holding means for securing the blade in the seat, the said means and the stud being located along a median line of the seat, the said means includn a hook portion under which the blade is engageable.
5. A device including a blade having a longitudinal closed ended slot, a holding means having a longitudinal concave seat, the blade being of less width than the seat and being adapted to be transversely flexed into the seat, the holding means having a rigid 'r-shaped stud projecting 'from the seat with the head of the stud extending transversely of the seat and adapted to engage the blade through the slot thereof on ang ular movement of the blade, said head having its under sideconvexed from end to end to constitute a cam for pressing the blade into flexed seating relation in the-seat, and means longitudinally spaced from the stud and connected to the holding means for securing the blade in the seat, the said means and the stud being located along a u median line of the seat, the said means including a pin, and the blade having an open ended slot for engaging the pin upon the said angular movement of the blade.
6. A device including a blade having a longitudinal closed ended slot, a holding means having a longitudinal concave seat, the blade being of less width than the seat and being adapted to be transversely flexed into the seat, the holding means having a rigid T-shaped stud projecting from the seat with the head or the stud extending transversely of the seat and adapted to engage the blade through the slot thereof on angular movement of the blade, said head having its under side convexed from end to end to constitute a cam for pressing the blade into flexed seating relation in the seat, and means longitudinally spaced from the stud and connected to the holding means for securing the blade in the seat, the said means and the stud being located along a median line of the seat, the said means including a pin, and the blade having an open ended slot nally shift the blade to cause the same to abut 5 the stud at an end of the closed ended slot and in the plane of the blade.
'l. A device including a flexible blade having a closed ended slot, a holding means having a concave seat and having a T-shaped stud at the 10 seat, the elongation of the head of the stud being transverse oi the seat concavity and the said head being adapted to pass through said slot to engage over the blade on angular movement of the blade, the underside of the head being con- 15 vexed from end to end for cam engagement over the blade to flex the same into the seat, and the convexity being sufficient to permit blades of difierent widths to be securely flexed into the seat by changing the width of the closed ended slot. 20
I JOHN E. DAVEY.