Method for producing a two-part member having rack teeth

Gear cutting – milling – or planing – Gear cutting – Gear tooth shape generating

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Details

29893, 407 29, 409 38, 409 40, 409 50, 409 51, 409 55, B23F 500

Patent

active

057185441

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

This invention relates to a method for producing a member which consists of two parts with rack teeth. The method cuts the rack teeth while dividing the entire rack into two parts.
As shown in FIG. 9, a photography tripod typically includes an elevation pipe 1 to attach to a camera platform (not shown) on which a camera is mounted. Rack teeth 2 in the surface of elevation pipe 1 engage a pinion 4. Leg pipes 5 are attached to elevation pipe 1 near its upper end. Leg pipes 5 can be spread apart and closed. Revolving pinion 4 moves elevation pipe 4 up or down to adjust the height of the camera installed on the tripod.
In order to permit a relatively large range of vertical movement of elevation pipe 1, elevation pipe 1 is made as long as possible. However, when elevation pipe 1 is moved downward and leg pipes 5 are widely spread to position the camera as low as possible, the end of a long elevation pipe 1 contacts the ground and limits the amount by which leg pipes 5 may be spread. One attempt to solve this problem includes dividing elevation pipe 1 into two parts and removing the lower part when taking a picture with leg pipes 5 widely spread.
With the two-part elevation pipe 1, it is difficult to coordinate the shapes and positions of the teeth of the upper and lower parts closely enough that, when pinion 4 crosses the junction between them, smooth motion results. Frequently, binding, or jerky motion occurs.
Therefore, precise cutting is required to shape rack teeth 2 on each divided part so that the undulations of the rack teeth 2 on the two parts correspond to each other when the parts are connected. The requirement for such precise cutting makes the two-part elevation pipe 1 unsuitable for mass production.


OBJECTS AND SUMMARY OF THE INVENTION

In order to solve the above problems, an object of the invention is to provide a method for processing a two-part rack member having rack teeth thereon. The method ensures that the undulations of the rack teeth on the two parts correspond to each other when the two parts are connected.
It is a further object of the invention to provide apparatus for severing a base member to form a two-part base member, and for form rack teeth in the separated parts of the two parts in which the portions of the base member adjacent the separation are half grooves so that the two parts fit together precisely to provide smooth operation, and resistance to chipping of the rack teeth nearest the separation.
It is a still further object of the invention to provide apparatus and method for cutting and shaping rack teeth on a plurality of base members aligned parallel to each other in a substantially continuous operation.
Briefly stated, the present invention provides apparatus and method for severing a base member such as an elevation pipe of a photographic tripod and forming rack teeth thereon in a single operation while the base member remains clamped in a V-block. The first rack tooth on each side of the location where the base member is severed includes half of a trough portion between adjacent rack teeth. Additional trough portions forming the remainder of the teeth are formed, either in the same severing and shaping operation, or in a later shaping operation. The formation of the inner half trough portions ensures that, when the two severed ends of the base member are brought together, a smooth transition will exist between the two rack portions. In addition, since the two severed ends always include half troughs immediately adjacent thereto, weaknesses and chipping resulting from the presence of partial rack teeth in these locations is avoided.
The invention comprises a rack member production method which arranges rotary shaping blades for forming rack teeth by cutting into the rack formation surface of respective base members for rack production, the rotary shaping blades being parallel to each other in a row in the longitudinal direction of the base members for rack production; maintaining the direction in which the rotary shaping blades are arrang

REFERENCES:
patent: 3230830 (1966-01-01), Romi
patent: 3711915 (1973-01-01), Maxon, Jr. et al.
patent: 3718052 (1973-02-01), Barr et al.
patent: 4521141 (1985-06-01), Abe
patent: 4588336 (1986-05-01), Navarro
patent: 4598451 (1986-07-01), Ohki
patent: 5628222 (1997-05-01), Yasuda et al.

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