US1828043A

US1828043A - Adjustable support for portable power saws

Info

Publication number: US1828043A
Application number: US279703A
Authority: US
Inventors: Theron L Hedgpeth
Original assignee: NELSON M BARNHART
Current assignee: NELSON M BARNHART
Priority date: 1928-05-22
Filing date: 1928-05-22
Publication date: 1931-10-20
Anticipated expiration: 1948-10-20

Description

Oct. 20, 1931. T. L. HEDGPETH ADJUSTABLE SUPPORT FOR PORTABLE POWER SAWS Original Filed Jan 2 Sheets-Sheet l INVENTOR Tberon Hedgpe/h ms ATTORNEY Oct. 20, 1931. T. HEDGPETH 1 1,828,043

ADJUSTABLE SUPPORT FOR PORTABLE POWER SAWS Original Filed Jan. 5, 1928 2 Sheet-Sheet 2 x5 n l l [El E I E U] H INVENTOR T/leron L. Hea'gbe/h HIS ATTORNEY "-ym'rso s'rA'rEis PATE T OFFICE names 1.. mourn, or oaxnann, camronnu. ABBIGNOB or emu-nun 'ro men it. an or mm, canrronma surroar non ronranna rowan saws I continuation in part or application Serial No. 244,411 fled January 8, 1828, now patent No. 1,758,121. 'l'his gpplleation filed Kay 22, 1928. Serial No. 279,703.

This invention relates to sup 0 and particularly tc a support that can used 1n connection with power driven'portable saws.

I This application is a continuation in part of my prior application, Serial No. 244,411, filed January 3, 1928, Patent No. 1,7 66,121.

' Small power driven circular saws are now in uite general use. Such saws are ordinari y equipped with a direct connected electric motor, and a handle provided with a trig- "ger for controlling the circuit of themotor. In order to use such saws, they must be supported in the hand anddt is-obvious that due to the weight of such apparatus, as well as I 'w-to the fact that the work must also be held in proper osition with respect to the saw,'the mani u ation of such saws is b simp c. It is accordingly one o the ob ects of my invention to make it possible to utilize so such saws in a more convenient manner.

With the aid of my invention, a portable power driven saw can beconverted in a sunple and inexpensive manner, to provide a device that is similar to a power driven table saw ;yet my frame for accomplishing this resuit can be very easily transported and set up at any desired location. t is accordingly another object of my invention to provide a saw an porting frame that can. be readily so clam or otherwise fastened to a bench or table, and that will guide accurately the relative movement of the saw and the work.

It is still another object of my invention to provide a simple, inexpensive frame by the aid of which the depth or angle of the 'cutcan be readily adjusted; as well as. to makeit possible to incline the plane otthe cut at any desired angle.

My invention 0 l :c'. tages, and has other objects which may be a made more y apparent froniaconsideration of one embodiment of my invention. For this purpose I have shown a form in the drawings accompanying and forming part of the present specification. 1 shall now proceed to describe this form in detail, which il-' lustrates the general principles of my invention; but it is tobe understood that this dQ'.

taileddesoription is not to betaken in'a lim- 's1anting cut;

no 111M118 many other advaniting sense, since the scope of m invention is.

best defined byv the appended c aims. Referring to the drawings: 7 .Figure 1 isa side view partly in section, of

one form of my-invention shown as applied 55 ton portable clrcular power drivensaw;

' Fig. 2 is a plan view of the same;

Fig. 3 is a perspective view thereof, showmg how the saw can be tilted to produce a Fig. 4 is a fragmentary elevation showing how the saw'can be supported-in a position at right angles to that shown in Fig. 1; and

Fig. 5 is a detail sectional view, taken along plane 5-5 of Fig. 4. 5

Int e resent instance, I show a circular saw devic arrangedto be driven by an electric motor 11, that is supported on the frame forming my invention. The saw is shown at 12; it can be connected by appropriate gearing with the motor-11. The saw mechanismntself, forming no part of the present invention, need, not be described, except to state that a handle or grip 13 is provided for guiding it manually, and'that a trigger 14 on the handle serves to control the motor 11. Electric power is furnished through flexible leads 15. A base plate 16 is also' shown, on.,which the motor and saw are .fastened. 1 i g A. work bench 17 is used upon which the 1 material, such" as lumber, to be sawed is accommodated. To this bench or table is fastened the supporting'frame, by the aid of" which the saw mechanism 11-12 is supported above the table.' For this purpose, I show in the present ms'tance a 0 amp 18, having a pair of horizontal, spaced jaws 19 and 20." Between these Jaws extends one edge of bench 17, as clearlyshown in-Fig. 1, and the jaws are clamped thereto by the aid of a clamping screw 21 that is threaded for example in the lower jaw 20.and has a flat portion 22 for enfi aginggthe lower surface of table 11.

. o ed'in this instance integrally with theclam 18, is a split-tubular socket member 23 aving a vertical axis. The two parts of the socket merhber each have extensions 24 for accommodating a clamping screw that springsthe two parts together for clamping a standard 26 therein.

This stan ard 26 serves as the main support for the'saw mechanism. For this pur-. pose, it has a heavier portion 27 that ingtgn fore proceedin with the details of the guid supports a horizontal guiding arm '28.

the features 0 constructionof the standar 26-27 will be described.

plishing this function.

Thus standard 26-27 is made hollow, and in .it there is accommodated a long screw 29. This screw is threaded in a nut 30 that fits into the bore of the standard. This nut has a projecting. pin 31 that passes through a vertical slot 32in standard 26, and rests on I the top edge of the socket 23. It is evident i a series of bolts or screws 34. To provide a that if standard 26-27 be held against rotation in the socket 23, and if nut 30 is adjusted vertically in the standard, the vertical position of the standard will be correspondingly adjusted. The screw 29 is used for the ve1- tical adjustment of the nut. In order to ensure that the screw 29 will be maintained against axial movement with respect to standard 26-27, any desired device can be used. For example, a collar 33 can be fastened to the screw, at its upper end. The upper surface of this collar contacts with the lower surface of the horizontal arm 28, which is fastened to the top of standard 26-27 by good rest for arm 28, the standard 26-27 can be provided with a braced horizontal extension 35. Y

To raise standard 26-27, the screw 25 is first loosened; then by the aid of crank 36 attached to screw 29, this screw is rotated in a direction to unscrew it from nut 30. The collar 33 rises with the screw 29 and pulls the standard up. To lower the standard, screw 29 is rotated in a reverse direction, causing collar 33 to move downward; The weight of standard 26-27 and the mechanism carried thereby causes it to follow the collar 33. The limit of adjustment is apparently that represented by the length of the slot 32.

The saw mech-anism 11-12 is movably supported on arm 28, so that it can be transported thereon alon the length of the arm. Thus for example, i it be desired to cut lumber into pieces in a transverse direction, the portable saw is grasped by handle 13 and moved back and forth on arm 28, and lumber placed on bench17 will be operated upon by the saw.

with respect to t By proper adjustment of the hei ard 26-27 as well as its angu ar position, such lumber can obviously be cut e1ther entirely or partly through, and either straight across or on any desired bias.

The guide carriage that is movably supported on arm 28 includes a two part device 3738. Thearm 28, as shown most clearly in Fig. 5, has a wedge-shapedcross section;

and parts 37-38 are formedto provide a comp ementary wedge shapedgroova. These ght of standi two parts are bolted together as shown, by the aid of bolts 39. The lower part 38 has.

a dependin lip 40 that cooperates with a stop 41 fastene to standard 26-27 for limiting the inward movement of the apparatus toward the standard.

The lower ,part also carries a boss42 to which is clamped a cross piece 43. e This piece, carries the saw mechanism. It is so arranged that it can occupy either of two positions; one, such as shown in Fig. 1, whereby plane of saw 12 is parallel to the axis 0 arm 28; and another, as shown in Fig. 5, whereby the plane of the saw 12 is at right angles to the axis of arm 28. The two

parts

42 and 43 can be dovetailed together in eitlter position; and for this purpose, the lowerface of boss 42 can be provided with a pair of square ribs 44 and 45 intersecting at right an les, arranged to dovetail into corres n g recesses in the plate 43. It is evi cut that the plate 43 supporting the saw structure 11-12 can be turned at right angles to boss 42 to provide an assembly such as shown in 4.

the

Under such circumstances, the lumber or terial-with a slanting or inclined cut; that is,

a cut, the lane of which departs from the vertical. 11 order to accomplish this with the aid of my device, Iprovide a segment lde member 37.)

support 48 that directly carries the saw structure, being fastened thereto as by bolts such as 49. ThlS segment has an are shaped flange 52 that is grooved longitudinally -at 50 to permit angular adjustment of the segment with respect to block 43. The lower surface of Lao block, 43 is curved to fit the arc of this flange. a A bolt 51 or other fastening means passes through slot 50 as well as throu h block 43 to hold the segment 48 and bloc 43, to the plate 38.,

It is to be noted that theaxisof the flange 52 is at an angle 1preferabl at a right angle) e axis 0 saw 12, wherebv the adjustment of the flange with res ct y block 43 provides a dis lacement of t e saw from a vertical axis. uch displacement is shown in Fig. 3. In this way, an inclined out can be produced by the saw. I

The details of the structure have now been completely described. A summary of its operation can now be set forth.

After the clamp 18 is in place on the table or' bench 17, the standard 2627 can be slipped into socket 23. The pin 31 will rest on the top surface of the socket. The vertical position of the standard can be adjusted by proper manipulation of handle 36, whereb the depth of the saw cut is determined. A ter this adjustment, the socket 23 is tightened around standard 26 b the aid of clamp screw 25. Before such tig tening, the angularity of the arm 28 with respect to bench 17 can also be adj ustefl by rotating the standard 26 in the socket 23 so as to position pin 31' directly over the appropriate graduation 48 The carriage 3738 'can now be moved along arm 28 to guide thesaw transversely ment of the saw and fastenin means passing through said slot for holding said mem-- her to sai carriage. i In testimony w ereof I have hereunto set my hand.

THERON L. HEDGPETH;

of the table 17; or else if desired, the saw structure can be held in position on arm 28 by screw 46,and the material to be sawed can be passed to the saw. This latter mode of operation is used when the saw 12 is parallel to the table 17, as shown in Fig. 4. In case inclined saw cuts are needed, the segment 48 can be angularly adjusted with respect to block 43. This is accomplished by first loosening bolt 51 and then tightening it after the adjustment is secured.

It is to be noted that the saw structure 11-12 is supported at a considerable distance below 'arm 28, whereby the weightthereof lends substantial stability to the eiitire device;-'furthermore, the entire saw can be easily removed from the frame by merely unfas'tening screw 51, and the saw canthen be used as an ordinary portable saw.

'- I claim:

1. In a supporting "frame for aportable motor driven saw, means forming an arm, a carnage movable along and supported upon said arm said carriage having an exposed are v uate bearing, surface, a member adjustable on said carriage, said member being in the form of a se ent having a slot in its periphery and having a curvature corres ondin'g to the curvature of the carria e there hy permitting angular adjustment 0 the saw and fastenlng means passing through sai slot for holding said member to said carriage.

2. In a supporting frame for a ortable power driven saw, a vertically a justable standard, a horizontal arm carried by said standard, a carriage movable along. and sup ported upon said am said carriage having an exposed arcuate bearing surface, a member adjustable on said carriage, said member being in the form of a segment having a slot in its periphery and having a curva-