US2692622A

US2692622A - Portable jig saw

Info

Publication number: US2692622A
Application number: US358655A
Authority: US
Inventors: George O Heese
Original assignee: Individual
Current assignee: Individual
Priority date: 1953-06-01
Filing date: 1953-06-01
Publication date: 1954-10-26
Anticipated expiration: 1971-10-26

Description

Oct. 26, 1954 G. o. Hl-:ESE

PORTABLE JIG SAW Filed June l, 1955 2 Sheets-Sheet l George 0. Hees@ Oct. 26, 1954 G. o. Hesse PORTABLE JIG SAW 2 Sheets-Sheet 2 Filed June l, 1953 Fig. 6

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Patented Oct. 26, 1954 UN l T ED .S TATES PATENT F FICE PORT-ABLE JIG SAW George 0. Heese, Roswell, N. Mex.

Application June 1, 1953, S'erialN'o. 358,655

A2 Claims. l

This invention relates to new and useful improvements in jig saws and the primary object of the present invention is to provide a jig `saw including a support and a blade holding inember secured at one end of the support by .a novel and improved spring connection whereby the blade holding member may be oscillated in a highly satisfactory manner with the spring means exing as the blade holding member is moved to its upper and lower limits.

Another important obj-ect `of the present invention is to provide a jig saw including novel and improved means for imparting oscillatory motion to the blade holding member and which means is so located as to utilize the whole benefit of the length of the blade holding member to obtain a highly advantageous mechanical advantage.

A further object of the present invention is to provide a jig saw including a blade holding member having novel and. improved means whereby a blade may be readily'attach'ed thereto or removed therefrom in a convenient manner.

A still further aim of the present invention is to provide a jig saw of the aforementioned'character that is extremely simple and practical in construction, strong .and reliable in use, eflieient and durable in operation, small and compact in structure, and inexpensive to manufacture, and otherwise well adapted for the purposes for which the same is intended.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction `and operation as more fully hereinafter described and claimed, reference being had to the 'accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure l is a side elevational view 'of the present invention `and with part of the collecting box broken away for the convenience of explanation;

'Figure 2 is a top plan view of Figure 1;

Figure 3 is an enlarged transverse vertical sectional view taken substantially on the plane of section line 3-3 of Figure 1;

Figure 4 is a fragmentary perspective view of the upper leg portion of the blade holding member and showing a blade, in part, secured thereto;

Figure 5 is a fragmentary perspective of the lower leg portion of the yblade holding member and showing the blade, in part, secured thereto;

Figure 6 is a fragmentary perspective View of the rear end portion of the support and showing the spring member secured thereto; and

Figure 7 is a fragmentary view of Figure 1 and showing the manner in which the spring member flexes as the blade holding member is oscillated to its upper limit.

Referring now to the drawings in detail, wherein for the purpose of illustration, there is disclosed a preferred embodiment of thepres'ent invention, the 'numeral I0 represents an elongated flat base having an enlarged forward end portion l2. An elongated-support I4 overlies the base and is suitably secured `thereto by fasteners or the like that extend upwardly through the base and into the lower edge of the support. Supportlll is provided with a rear end portion I6, in the form 'of a separate vertical strip that is secured by fasteners I8 to the body portion of the support.

Forward and rear spaced parallel vertical walls 2B and 22 lextend Vtransversely of base I0 over end portion I2. 'These walls may be suitably secured to end 'portion I2, but the wall 22 is also secured to the forward vertical edge of the support V4 `by 'fasteners 24 for additional strength. The upper ends of the

walls

20 and 22 `are suitably secured to and support a horizontally disposed platform '26 having .a forward overhang portion 28 that extends forwardly of wall 20 and which is provided with a slot 3U to accommodate a'blade B.

rEnd portion I 2 is adapted to support a removable open top, saw dust collecting box 22 which is disposed in front of wall 20 and under overhand ,portion 28, whereby saw dust produced while cutting work, may pass through slot 3D to be collected in box 32.

A substantially U-shaped blade holding member 34 overlies the support I4 and includes an upper leg portion 36, the lower leg portion 38 and a connecting portion 4U. The connecting portion 40 vis preferably integrally formed with the rear end of leg portion .S8 `and engages the rear end of leg portion 36. A bolt 42 extends through registering bores in the leg portion 36 and connecting portion 40 and has a complemental nut whereby leg portion 36 may be separated from or secured to portion 4I).

Means is provided for connecting the blade holding member v'3ft to the support M forl vertical swinging or oscillatory motion. This means comprises an L-shaped leaf spring or resilient member 44, having a vertical portion 4-'6 which is secured against the lrear `'face of strip I6 by fastening .means 48. The horizontal 'portion 50 of spring M extends forwardly over strip I6 and into a horizontal slot 5I in portion 40 and is held therein by bolt 42 which extends through an 'accommodating aperture in portion 50.

Means is provided for imparting `oscillatory motion to the blade holding member 34. This means includes forward 'and rear bolts 52 and 513 that extend ydoiivnw'ardly through apertures in the forward part oflegportion 38. A lower strip 56 extends between the bolts and under the leg portion SIland the 'ends of s'trip'56 are apertured to slid'ably engage the bolts L52 and 54. 'Nuts or abutments 56 and 66 yare threaded on the lower end of bolts 52 and thunder vthe strip 56, and form rests for'strip56. A second strip 62 extends between the bolts 52 Aand 54, under leg portion 38, and over stripr. The ends of strip 62 are also yprovided with apertures that receive the bolts 52 .and 54.

Coil springs

84 and 68 are engaged on bolts 52 and 54 and are biased between strips 58 and 82 to yieldingly urge the strip 82 against the under surface of leg portion 38 and strip 5t against abutments 58 and B8.

An electric motor 68 is secured to the end portion I2 of base I0 and the armature shaft 'l0 extends transversely of the base and under leg portion 38 between and spaced from the bolts 52 and 54. An eccentric or cam 12 is secured to the armature shaft 'l0 and is disposed between the strips 56 and G2 to oscillate member 34 as the shaft 'I8 rotates.

The

walls

28 and 22 are provided with registering

vertical guide slots

74 and 18 that slidably receive the lower leg portion 38 to restrict horizontal movement of blade holding member 34 as the same is oscillated by powered eccentric '12.

Means is provided for removably holding the blade B extended between the forward ends of leg portion 8S and 38. This means comprises a lower holding strip 78 secured to the upper edge of leg portion 88 and having a forward bifurcated downwardly concaved end portion 80 that extends forwardly from leg portion 38 to engage the lower end and holding pin P of blade B.

Channel bracket 82 is secured to the forward end of leg portion 38 and the ends of the bracket extend upwardly from leg portion 33 and support a pin Elfi that is spaced above and which eX- tends transversely of leg portion 36. An arm 88 overlies leg portion 38 and rests upon pin 84 between the upstanding ends of bracket 82 for rocking movement. The foward bifurcated upwardly concaved end 68 of arm 86 engages the upper end of holding lug or pin P of blade B.

A boit 95 extends upwardly through an aperture in leg portion 35 behind bracket 82 and also extends upwardly through an aperture in the rear end of arm 8B. A wing nut 92 is threaded on the upper end of bolt Q0 and engages upon the rear end of arm 88 to adjust the arm 86 about pin 84 for tightening blade B.

A lower guide strip 94 is secured over strip 'i8 and includes an upwardly and forwardly curved bifurcated end portion 96 that receives blade B. An upper guide strip 98 is secured to the forward end of leg portion 35 and includes a downwardly forwardly curved bifurcated |00 that engages the upper part of blade B.

In practical use of the present invention, a blade such as blade B may be readily attached to the blade holding member 34 by loosening nut 52 and engaging pin P over end 88 after pin P has been gaged under the bifurcated end portion 80 of strip 58. Then nut 92 is tightened to pull the blade B upwardly and retain the blade straight and tensioned.

As the eccentric l2 is driven, the same will ride against the strips 56 and G2 to impart oscillatory motion to member 34. As member 34 is swung upwardly, portion 46 will be spaced from the rear face of strip i6 to urge the member 34 to its normal horizontal position in response to rotation of the eccentric 'I2 in order to obtain a true up and down stroke for the member 34.

From the foregoing, the construction and operation of the device will be readily understood and further explanation is believed to be unnecessary. However, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the appended claims. What is claimed as new is as follows: 1. A jig saw comprising a base, an elongated support secured to the base and having forward and rear end portions, a substantially U-shaped blade holding member including upper and lower legs and a connecting portion joining said leg portions at their rear ends and disposed at the rear end of said support, a spring member carried by the rear end portion of said support and engaging said connecting portion to support said blade holding member for vertical swinging movement, means on the base engaging the lower leg portion to impart oscillatory motion to said blade holding member, a platform supported on the base over said lower leg portion and under said upper leg portion and having an opening to accommodate a saw blade carried by the forward ends of said leg portions, and means carried by the forward ends of said leg portion for holding a blade, said spring member comprising an L- shaped leaf spring having a vertical portion and a horizontal portion, said vertical portion being secured to the rear end portion of said support and said connecting portion having a horizontal sot in which the horizontal portion of said spring is secured.

2. A jig saw comprising a base, an elongated support secured to the base and having forward and rear end portions, a substantially U-shaped blade holding member including upper and lower legs and a connecting portion joining said leg portions .at their rear ends and disposed at the rear end of said support, a spring member carried by the rear end portion of said support and engaging said connecting portion to support said blade holding member for vertical swinging movement, means on the base engaging the lower leg portion to impart oscillatory motion to said blade holding member, a platform supported on the base over said lower leg portion and under said upper leg portion and having an opening to accommodate a saw blade carried by the forward ends of said leg portions, and means carried by the forward ends of said leg portion for holding a blade, said spring member comprising an L-shaped leaf spring having a vertical portion and a horizontal portion, said vertical portion being secured to the rear end portion of said support and said connecting portion having a horizontal slot in which the horizontal portion of said spring is secured, said connecting portion being integrally formed with the rear end of said lower leg portion and a fastener extending through said connecting portion, said horizontal portion of said spring and the rear end of said upper leg portion to removably secure the connecting portion to the upper leg portion and the horizontal portion of the spring in the slot.

References Cited in the file of this patent UNITED STATES PATENTS Numbei- Name Date Re. 7,725 Plummer June 5, 1877 116,208 Mitchell June 20, 1871 118,498 Wallace Aug. 29, 1871 181,762 Anderson Sept. 5, 1876 188,225 Arthur Mar. 13, 1877 2,111,036 Wippel Mar. 15, 1938 FOREIGN PATENTS Number Country Date 819,000 Germany Oct. 29, 1951