US1797088A - Sawing apparatus - Google Patents

Description

March 17, 1931. H c, HOWARD 1,797,088

SAWING APPARATUS Filed June 28, 1929 BY My HIS ATTORNEY Patented Mar. 17, 1931 PATENT i OFFICE HENRY C. HOWARD, OF DARLINGTON, WISCONSIN SAWIN G APPARATUS Application filed June 28,

This invention relates to certain novel improvements in sawing apparatus and has for its principal object the provision of an improved construction of this character which will be highly efficient in use and economical in manufacture.

It is among'the objects of my invention to provide a sawapparatus in which a so called jig-saw may be employed which may be arranged in a manner such that the saw may be moved relative to the member to be operated on in order that the member may be formed into predetermined shapes.

Another object of the invention is to provide a sawing apparatus of the above named character which will be arranged for swinging movement in arcs of predetermined sizes in order that substantially circular members may be formed.

A. further ob'ect of the invention is to provide a device of the above described character which will embody a'novel and expeditious saw mounting which will be so arranged that the position of thesaw may be varied.

A still further object of the invention is to provide a device of the above described character in which the saw supporting members will be mounted in a manner such that they may be simultaneously moved in order that alignment therebetween may be maintained. i v I A still further object of the invention is to provide a novel mounting and interconnection for the saw supporting members which will be arranged so that the reciprocatory movement may be expeditiously imparted thereto.

Other objects will appear hereinafter.

The invention consists-in the novel combination and arrangement of parts to be hereinafter described and claimed.

The inventionwill be best understood by reference to the accompanying drawing, showing the preferredform of construction and in which: I

Fig. 1 is a side elevational view of a preferredform of construction for my invention;

Fig. 2 is a view taken substantially onthe line 2-2 on Fig. 1;

1929. Serial No. 374,589.

Fig. 3 is a'plan detail view ofoneofthe saw supporting members employed in my devlce;

Fig. 4 is a sectional view taken substantial 1y on the line 4 -4 on Fig. 8; I

Fig. 5 1s a sectional view taken substantially on the line 55 on Fig. 1; and 1 Fig. 6 is a detail view drawn to an enlarged scale depicting the rear end portion of one of my saw supporting members. i

In the accompanying drawing wherein I have llustrated a preferred form of constructlon for my invention 10 generically in-' dicates the base of my improved device which has uprightarms l1 and 12 extending therefrom, the arm 12 projecting beyond the arm 11 and a rib 13 projects from the arm 12 across the upper end of the arm 11 and has a bearlng 14 at the outer end thereof. A shaft '15 is journaled in the arm 11 and the arm 12 and this is the power receiving shaft of my mproved machine and isintended to be connected to a suitable source of power; as for example, by directing a belt around the pulley 16 that is fixed on the shaft exteriorly of the arm 12.

A vertically extending shaft 17 'is journaled in the bearing 14 and has a pulley 18 provided thereon. Extending outwardly from the arm 12 is-a bracket 19 which has, at the outer endthereof, a bearing 20 in which the shaft 21 is journaled, the shaft 21 being axially aligned with the shaft 17. A pulley 22 isprovided on theshaft 21. R0- tatably supported from the arm 12 are pairs of pulleys 23 and 24c. An endless belt25 is directed around the pulleys 18, 24, 23',and 22 and is arranged so that when movement is imparted to either the shaft 17 or 21 that the movement will be imparted to the other of these shafts in the same direction as the direction in which the other of the shafts is moved.

Extending outwardly from the shaft 17 is an arm 26 which has a handle 27 provided thereon at the outer end thereof. A reen-* forcing brace 28 extends angularly'between the shaft 17 and the arm 26. By gripping the handle 27 the shaft 17 and, therefore, the shaft 21 may be turned about their axes and it is, therefore, manifest that members connected thereto will be caused to travel through a substantial arc inscribed from the center of the shafts 21 and 17.

Connected to the arm 12 intermediate the support for the pulleys 23 and 24 are two supporting. members 29 and 30. The peripheral contour of these members is best illustrated in Fig. 2 wherein the member 30 is depicted and by referring to this view it may be seen that the member 30 is fixedly connec ed to the arm 12. The member 29 is pivotally mounted on the arm 12 and is superimposed above the member 30.

A substantially U-shaped member ically indicated by 31 is provided and one end of the shaft 21 is journaled in one limb of the member 31 and one end of the shaft 17 is journaled in the other limb of the member 31. The shaft 17 is also connected to the member 30 as indicated at and it is, therefore, manifest that the free ends of the shafts 17 and 21 are suitably retained. Arranged on the member 30 in line with the center of the shaft 17 are stops 33 and 34.

The member to be operated on by my improved saw, which will be described hereinafter, is intended to be disposed on the member 30 and the member 29 is superimposed thereabove. A cross brace 35 extends across the member 29 and an eccentric clamp 36 mounted on the upper limb of the bracket 31 bears against this cross brace 35 to force the member 29 downwardly toward the member 30, it being understood that one edgezof the member to be operated on will have been previously arranged in abutment with the stops 33 and 34 and it is, therefore, manifest that this member'to be operated on is very effectively retained in position.

The saw supporting members inmy improved'device are generically indicated by 37 and 38 as best illustrated in Figs. 3, 4 and 6. The member 37 is substantially U-shaped and embodies limbs 39 and 40 and a bight portion 41. The member 38 is similarly shaped. Arranged between the outer ends of the limbs 39 and 40 isa slide'block 42 which has rack teeth 43 provided thereon. Brackets such as 44 extend outwardlyfrom the arm 39 and a stud shaft 45 is journaled therein. Mounted on the stud shaft 45 between the brackets 44 is 'a-pinion 46which meshes with the rack teeth 43; Suitable clamping members 47 hold the limbs 39 and 40 in engagement and serve to eifectively support the slide block 42. In a similar manner a slide block 48 is supported between the limbs of the member 38.

Pivotally mounted in a slot in the slide 42 -is a block 49 and asimilar block 50 is similarly mounted in the slide block 48. A saw blade '51 is suitably connected to the blocks 49 and 50 and extends therebetween asclearly shown in Fig. 1. The saw blade 51 also exgener-' tends through a slot 52 in the supporting plate 53, which supporting plate 53 has the face thereof aligned with the member 30 as clearly illustrated in Fig. 1.

As best illustrated in Fig. 6 a pivotal support 54 is provided between the arms 39 and 40 adjacent the bight portion 41 and the shaft 17 is intended to be extended through this pivotal support. A similar pivotal suptrated in Fig. 1 and which is suitably con-:

nected to the bight portion 41 of the member 37 as clearly illustrated in Figs. 1 and 6 and in this manner the members 37 and 38 are connected together for simultaneous move ment in equal amounts.

Mounted on the shaft 15 adjacent and exteriorly of the arm 11 is a wheel 56 which has a stud 57 projecting therefrom. A member 58 extends upwardly from the stud 57 and an arm 59 is pivotally connected to the member 58. Pivotally mounted on the cross brace 28 is a lever 60, the pivotal mounting thereof being indicated at 61. tion 62 interconnects one end of the lever 60 and the free end of the arm 59. A link 63 interconnects the member 37 and the arm 60.

It is manifest that it is necessary that the saw blade 51 be maintained in substantially vertical position with respect to the work supported between the members 29 and 30. In order to accomplish this I provide substantially square openings such as 64 in the shafts'45. Therefore, by extending a square member-through these openings 64 and properly manipulating the square member through the medium of a handle provided thereon or other suitable means the pinions 46 may be simultaneously operated to simultaneously and equally act on the rack teeth on the slide blocks 42 and 48 to simultaneously move these blocks and, therefore, properly position the saw.

It is, therefore, manifest that when the shaft 15 is rotated movement thereof will be transmitted through the stud 57, member 58, arm 59, universal connection 62, lever 60, link 63, to member 37, thence through connecting member 55 to member 38 and inasmuch as the saw blade 51 is supported from the members 37 and 38 it is manifest that reciprocal movement will be imparted thereto. Since the members 37 and 38 may be turned with the shafts 17 and 21 it'is manifest that the saw blade 51 may be moved through a substantially circular accurate path.

A universal connec-'

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