US2372021A - Planishing hammer support - Google Patents

Description

. Filed June 11, 1941 gwvwom ELME'R J. EBIDEN Patented Mar. 20, 19 45 Elmer J. Seiden, Jackson, Mich., assignor to bakley D. Lutes and Emory Lutes, Jackson, Mich., doing business as Selden Pneumatic Tool Com:

pany

Application ml 11, 1941, Serial N 39m534 The present invention relates to percussion tools, and more particularly to a stand for. supporting a planishing hammer.

Stands according to prior art for supporting planishing hammers conventionally'consist of a base, which supports a vertical column. The column supports an anvil and the planishing hammer. The objection to this typeof stand resides inthe fact that for cylindrical columns which are conventionally employed to permit easy'verti'cal adjustment of the hammer and the anvil, there is a period of vibration, with the result that when the hammer reciprocates at a certain rate, the column will vibrate interfering with the operation of the hammer. The vibration of the column results in the hammer striking the work at a rate substantially less thanthe rate of reciprocation of the hammer, thus slowing up-the hammering and introducing'an irregularity in the hammering which makes impossible the p-roductionof work with a finished appearance.

According to present invention, the foregoing difficulties havebeen eliminated by providing two columns disposed one behind the other with respect to the hammer for supporting the hammer.

Accordingly, an object of the present invention is to provide two columns, one disposed behind the other with'respect to the hammer and its anvil.

Another object of the invention is to provide a stand for percussion tools and the like, having a base from which two columns project and supporting structure clamped to said columns, the supporting structure serving to rigidly space the columns.

These and other objects residing in the arrangement, combination, and construction of the parts will be apparent from-the following specification when taken with the accompanying drawing in which:

Fig. 1 is a side elevation of a percussion tool stand according to the present invention, and

Fig. 2 is a section on the line IIII of Fig. l, and

Fig. 3 is a general'section illustrating a three column stand.

Referring particularly to the drawing, the reference character I indicates a base having recesses 2 for receiving the heads of bolts employed to secure the base I to the floor. Projecting upwardly from the base I are columns 3 and 4, secured t0 the base I and being disposed in parallel relation. The columns 3 and 4 may be of the same or diflerent diameters.

Clamped to the columns 3 and 4 is a bracket 5 supporting an anvil 6. As shown particularly in Fig. 2, the bracket 5 is provided at one end thereof with a split I passing through bores 8.

The columns 3 and 4am disposed in the bores 8 and bolts 9 are employed to clamp the-bores '8 against the sides of the columns 3 and 4, the split I permittingthe clamping action; The anvil 3 is similarly secured in a bore l0, disposed atthe opposite end of 'thebracket 5 and having communicating therewith a split ll. Bolts l2 are employed to clamp the bore 5 I ll against the anvil 6. It will be appreciated that the bracket 5 may be slid vertically along the columns 3 and 4 by loosening the bolts 9 and then tightening them again when the bracket 5 has been moved to. its adjusted position.

Clamped'to' the columns 3 and 4 above the bracket 5 is a bracket i5. The bracket-l5 is similar to the bracket 5 in that it is provided with bores for receiving the columns 3 and 4 corresponding to bores 8 in the bracket 5, and a split corresponding to-thesplit 1 in the bracket 5, so that the bracket l5 may be clamped to the columns 3 and 4 by bolts I6. Suitably secured to the outer end of the bracketl5 is a pneumatic hammer I'I. Communicating with the hammer I1 is a compressed air valve l8 for controlling the rate of flow of compressed air to the pneumatic hammer l1. Mounted on the bracket I5 is a shut-off valve 19 connected to the valve It by a conduit 20 and to a source of compressed air by a conduit 2|. The shut-off valve I9 is controlled by a foot pedal 22 through a system of links and levers 23, not a part of the present invention.

' It is thought that the above described irregu lar operation of a pneumatic planishing hammer similar to that disclosed, but provided with only one column instead of the two columns 3 and 4, is due to the fact that the reciprocation of the hammer l1 and the impact of the same against I the anvil 3 causes the single column to vibrate when the rate of reciprocation of the hammer i1 is "equal to the natural period of vibration of the single column or some multiple thereof, and

that the anvil is thus caused .to vibrate through its connection with the single column. It is further throught that due to the weight of the anvil mer does not engage the work at therate of re-' ciprocation of the hammer, but at a very much the brackets and I5 may be supported solely from the column 3 while other means z'fl'le provided to clamp the columns 3 and 4 rigidly together. For instance, the 'bracket l ilrnig'ht be employed as shown whilejthe bracket Tor the anvil 6 is clamped only to the-column 3to'permit sidewise swinging of the same. Accordingly it is porting brackets each provided with clamping means toward one end and supporting means at the opposite :end, means rigidly clamping the clamp means of one of said brackets on said upstanding spaced columns near the upper end contemplated that such arrangements may the employed with the scope of the present invention.

Another embodiment of the invention is disclosed iniFisure -3 wherein a three column .stand is disclosed. In this-form of the :invention three columns, -2-6 :and 21, :are employed, secured to a hose '28. It will be observed that each of the rear columns 26 :and 21 -a-re-generally behind the front column 25, .thus obtaining generally the same zresultsias are obtained with the sttuctureroi Figures 1 and 2. Associated with the=columns 25,16 and 21 are appropriate brackets, not shown, iorzsupportin g hammer i-l andianvil 5-,each-.of the brackets extending substantially .in the :direction of :the arrow in Figure 13.

Having thus described any invention, what I desire :to secure byLetters Patent'and claim is:

l. A stand :for a high speed ppercussion' tool or the like comprising a base, :a pair :of upright structural columns in spaced relation, \vertica'lly spaced horizontally extended members cantilevered a t-tone end and-rigidly mounted upon-and supporting said columns inspacedrelation 28$ the other :end, said members being disposed in substantially the same general vertical plane and in. the-.same-general plane as uptight columns,

thereof with the supporting end thereof extend- 'ing in cantilevered relation, and means rigidly clamping the second bracket on said upstanding columns :belowth'efirst-mentioned bracket with the supporting end thereof also cantilevered and substantially vertically spaced below the cantilevered end (of the :upper -.bracket, the supporting ends of said brackets being adaptable :tov one mount a percussion toolior the .likeand the other mount an anvil on their cantilevered .ends.

3. A stand .for.high speed percussion .tools :and thelikecomprising a rigid base, ta-pair :pf upright structural columns upstanding in. substantially spaced relationfrom said base -a pair-ofsubstantially horizontally disposed rbracket members eachprovided adjacent to one end with openings receiving the spaced upstanding structural columns, said zbrackets being -prouided :adjacent to theiropposite ends with percussion tool and anvil supporting portions, and .meansirigidly mounting said bracket members :on the upper portions of said upstanding :structural :columns in vertically spaced relation with 'the supporting portions thereof outstanding laterally from said structural columns in substantially vertically spaced relation, "said bracketseach lbeing rigidly, assembled and heldupon both of the-upstanding structural columns.

, :ELMERJ. SEIDEN.

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