The daily morning journal and courier., 1901-06-15

blunt-pointed screw, and later whei
 MT. Rogers was superintendent of thu Utica Screw company, he made change
 in 1t needful to producing gimlet points The company having blunt pointed
 screws on it's hands, which were unsal
 able, machines were arranged for gim
 let-pointing them, thus making tht l screws marketable. ! The Eagle Screw company's later sue
 cess was due to the adoption of Thom
 as J, Slane's inventions, now substan l tially used in this country and abroad | The Sloan inventions were mainly il
 the combining of the shaver and nick i CT, to which he added subsequent pro- f cess-that of reshaving the head to re-
 move the burr formed in cutting the
 nick. The Sloan threader was an auto.
 matic pointing and chasing machine : and therefore was capable of making | gimlet points. Sloane patented spec
 ial form of point and heel of steel.
 Cullen Whipple, an inventor of Prov | idenoe, elaborate the French threader
 and with the use of this machine the New England Screw company on Eddy street in this city made gimlet points. This was easily done, the machine be-
 ing chasing machine, the former simply having. to be changed to
 produce point In chasing screw
 threads formerly two tools were used.
 These were combined into one under e
 patent issued to Kendall & Hunt of
 Providence One of the ribs of this
 threading tool was made with a bev-
 eled face to produce the heel and the
 point. The other rib with it's face
 parallel to the avis of the screw,
 formed the cylindical portion between
 the heel and point It was thought to
 be necessary to have this tool to pro- duce the Sloan screw, owned by the Eagle Screw company. This resulted in one company (the Eagle) owning the patent on the screw, and the other (the New England) on the tool for manufacturing it. The consolidation of the Eagle screw company and New England Screw company, in the year 1860 harmonized all differences between the two companies. A single tool is now used for cheapness of manufacture and the facility with which 1t cuts, and is a compromise between the two faces of the double tool just mentioned. A screw produced by it was patented by William Whiting of this city, who, in connection with the late George F. Wilson, started a screw factory in New Bedford, which was afterward ab- sorbed by the Union Screw company of this city.
 The rolling, swaging or forging of machine screw threads has been em- ployed many years with comparative success, but efforts have been made in this country since 1880 to produce a suitably rolled gimlet pointed wood screw. The main difficulty seemed to arise from the extra displacement of stock. Efforts were made many years ago by MT Harwood of Utica, New Y ork, and by many others who have spent considerable sums of money in and in efforts to produce a rolled wood screw, but they were all abandoned as impractical. Later on Hayward A. Harvey (the inventor of 1arveyized armor plate) made experi- nents in that direction with indifferent success, but from 1879 to 1885, after the of homogeneous material, he attained partial success after en- many difficulties. His roll Ing dies consisted of an inner circular lie and an outer segmental die The shape and form of the screw threads were made upon these dies, but the outer or segmental die being of larger than the inner, there was a "quarreling," producing imper- 'ect threads. Then, the angle of the lib of the die at the beginning was more obtuse than at the finishing end. This was detriment to the complete 1 formation of the thread Harvey also | developed the depth of the thread by | increasing the penetration of | he ribs of the die into the screw blank, The gradual penetra ton. If | ,ourse, produced an elongaton of tine | body of the blank. This elongation was | lot uniform and it was detrimental to | he formation of a good point as there | vas no certainty of the points being | supplied with the requisite amount of | metal to form full thread. therefore he finished points were of n very ur- ertain quality. His thread was form q by the union of two sheets and con-
  and machinery were patented y MT. Harvey and sold In this city nd in England for large sum of honey. The American Screw con- any in it's efforts to produce screws y Harvey's process discovered the ob- tacles that prevented it's complete uccess. To overcome the difficulties it was found essential that 1e two dies forming the screw should C on their faces fiat and the ribs of ne dies should correspond exactly Ni:h ach other. The faces of these dies ere adjusted to correspond with the iameter of the core of the ffnihhad crew. The ribs of the die entered the rev blank at once to their full depth nd as the dies reciprocated in move lent, the blank being revolved, the widening faces of the ribs the dies forced the metal to flow terally into the grooves of the die, a solid thread and in an av age size of screw increasing the dia- eter of the threaded portion of the ldy about three numbers screw gauge yer that of the cut thread screw It | ,, i'll be readily seen from the immediate of the die to its full derth 1 to the blank, that there was no sub
 ouent pressure brought upon the core
 the screw, consequently there was f i, elongation of the blank, but as that . was an uncertain quantity, f ey were failures The point of the e rev being g cone and much smaller f an the body had in measure to be