US1224075A - Stapling-machine. - Google Patents

Description

J, B. CROFOOT.

STAPLNG MACHINE.

APPLICATION FILED ocT.2. I9I5.

v Patented Apr1 24, 1917.

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JOHN B. CROFOOT, OF CHICAGO, LLINOIS. I

STAPLING-MACHNE.

Specification of YLetters Patent.

Patented Apr. '2411, 1WD?.

Application filed October 28, 1915. Serial No. 53,469.

To all 'whom t may concern:

Be` it known that I, JOHN B. Ciioroor, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certainnew and useful Improvements in Stapling- Machines, and l, do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and iigures of reference marked -thereon, which form a part oi this specification.

This invention relates to new and useful improvements in tackng or stapling machines and the object in view is to generally improve upon and render more ecient this type of apparatus.

'lhe present invention consists essentially, rst in the provision of a novel means for advancing the 'staple strip to the proper position to have a fastener severed and driven into an object. p Another and an essential feature of the invention consists inl the prpvision of extension means upon the plunger cap for acting as an automatic stop and serving as'ameans to protectvthe spring which acts as a plunger.

Another feature of the invention consist in the provision of a `=l"s`haped lmife so arranged that, when removed, it will allow the staple strip to drop from the casing.

The invention' consists further in various details oi construction and arrangements ot parts whereby the diderent features of the invention may be readily assembled and disassembled, when desired, for repairs, etc.`

My invention isillusti'ated in the accompanying drawings, in which:

Figure. 1 is a central vertical sectional view through 'a tacking or stapling inachine emhodying the features of my invention.

Fig. 2 isa section on line 8 3 of Fig., 1. Fig. 3 is a perspective lview oil the cutting lmiie. l

Reference new helingV had to the details of the drawings by numeral,1 designates the casing o' the apparatus-which may be' of any suitable size or shape and which is provided with a handle 2, and 3 is a vertical way formed near one end oi the casing and in which the plunger 4 is 'adapted to have a vertical longitudinal movement. Said plunger has a notch 5 in one side and has a cap 6 which is hollow to receive the upper confrom injury.

The forward end of the bar 13 is also. pro-.

vided with a shoulder 13a; adapted to cooperate With 'the shoulder 14 formed at the base of the notch 5 of the plunger i for limiting the upward movement of the plunger 4.

Mounted within the slotted bottom of the casing isa block 11 having' a cutter edge and which block is inverted T-shape in cross section, as shown, said cutter block being held in place by fastening means passed through registering apertu. i .s 12 in the walls of the slot and in said cutter block. llt will be understood that said block also serves 'the purpose of a guide ior the staple strip.

A longitudinally movable har 13 is mounted in a horizontal' recess in the-casing and 1s held to its limit in one direction by means of a coiled spring 14 bearing intermediate the bottom of the recess in which the bar is mounted and the inner end of the latter.

Said bar 13., preferably of a suitable metal and case hardened, is recessed` upon its under surface and carries a pivotai pin 15 upon which the upper end oia apawl 16 is pivoted. The free end ot said pawl is forked and is adapted to 'engage and feed forward a staple strip 17. The forward end of the bar 13 is beveled as at 13 and isfadapted to 1 engage a beveled edge 3 formed in the edge of the plunger when the latter is in its normal elevated position, the bar 13 at its for ward end having a shoulder which iits over the lower end of the notch therein. A

spring 18 bears yieldingly against the pawl and .is adapted to hold the same yieldingly against the staple strip which rests and moves upon the upper edge of the cutter block 11.

been fed forward, a second pawl, designated by numeral 18', is pivotally mounted upon In order to prevent a reverse'A movement to the staple strip after having i a pin A19 and a spring 20 serves to hold the pawl 18', the free end of which is notched or forked, in engagement with the staple strip at a location adjacent to the' previous staple which has been severed therefrom. In operation, the staple stripl is adjusted over the cutter block in the manner shown in the vertical central sectional view yof the l drawingsand, when the plunger 1s driven downward, the beveled edge with the notch Itherein, coming against the beveled ledge of the bar, will cause the latter to be forced back against the tension of the spring 111.

The pawl16 being pivoted to said bar will 'strip from rearward movement duringjthev operation of the machine. When pressure is released from the plunger, the spring 9 bearing yieldingly thereon will return the plunger `to its farthest upper limit and,

when the notched portionthereof comes opposite the 'beveled end of the bar 13, the

spring 14: 4acting against the inner end of the latter will throw thebar 13 out into the magere notch to its normal position and. in the vforward movement'of thebar 13 the pawl 16 will be moved therewith and feed the staple member forward'so that another staple will be in position to be severed and driven upon.

the next downward thrust of the' plunger.

By 'the provision of a tacking'or 'stapling machine made in accordance with my nvention, it will be noted that a movement is given the staple strip through the means described and the cutter block is of such a construction that, when *being removed, 'the staple strip will readily fall from the casing and, bythe provision of the cap as shown anddescribed, means is provided for Aprotecting and guiding the spring.

What I claim to be new 1s:-

In a stapling machine, a body, a reciprocating staple setting plunger, a spring for moving the plunger upwardly, a bar operating at right angles to the reciprocating plun er, means carried by'the bar for feeding't e staples forward, and means carried by the plunger and coperating with 'the bar for restricting the vertical movement of the plunger against the tension of the s ring. In testimony whereof I hereunto a X my signature in presence of two witnesses.

JOHN B. CROFOOT.

A -Witnesses JOSEPH HILLER, GEORGE S. DUBOIS.,

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