Impact enhancing apparatus and method

An impact enhancer apparatus comprising:

• a substantially tubular inner member;
• a substantially tubular outer member which is axially movable in relation to the inner member;
• and
• a primary energy storage device adapted to store energy when the inner member is moved in either of upward and downward axial directions with respect to the outer member;
• and
• a secondary energy storage device adapted to store energy when the inner member is moved in the upward axial direction with respect to the outer member;
• wherein the primary energy storage device is adapted to provide a lower level of resistive force to compression than that provided by the secondary energy storage device.

An impact enhancer apparatus comprising:

• a substantially tubular inner member;
• a substantially tubular outer member which is axially movable in relation to the inner member;
• and
• a primary energy storage device adapted to store energy when the inner member is moved in either of upward and downward axial directions with respect to the outer member;
• and
• a secondary energy storage device adapted to store energy when the inner member is moved in the upward axial direction with respect to the outer member;
• wherein the primary energy storage device comprises a plurality of spring disks oriented in the same direction as one another;
• wherein the plurality of disks in the primary energy storage device are arranged with a number of disks oriented in one direction alternating with a number of disks oriented in the other direction.

An impact enhancer apparatus comprising:

• a substantially tubular inner member;
• a substantially tubular outer member which is axially movable in relation to the inner member;
• and
• a primary energy storage device adapted to store energy when the inner member is moved in either of upward and downward axial directions with respect to the outer member;
• and
• a secondary energy storage device adapted to store energy when the inner member is moved in the upward axial direction with respect to the outer member;
• wherein the primary and secondary energy storage devices are located in a respective annulus formed between the inner and outer members;
• wherein the primary energy storage device is further located between a second arrangement of upper and lower shoulders formed on the inner member and a lower shoulder formed on the outer member and a lower shoulder formed on a moveable member;
• wherein the secondary energy storage device is further located between a first arrangement of upper and lower shoulders formed on the inner member and an upper shoulder formed on the outer member and an upper shoulder formed on a moveable member;
• wherein the moveable member is located in the annulus located between the primary and secondary energy storage devices;
• and
• wherein the moveable member comprises a greater axial extent and thus a greater distance between its upper and lower shoulders than the distance between the inner member lower shoulder of the first arrangement and the inner member upper shoulder of the second arrangement.

A method of increasing the jarring force imparted by a jar apparatus comprising:

• providing a substantially tubular inner member;
• providing a substantially tubular outer member;
• providing an energy storage device capable of storing greater energy therein due to upward movement of the inner member with respect to the outer member;
• wherein the energy storage device comprises a primary and a secondary energy storage device;
• moving the inner member in the upward direction to thereby cause the primary and secondary energy storage device to be compressed;
• including moving the inner member in the downward direction and moving the secondary energy storage device with the inner member to thereby cause only the primary energy storage device to be compressed.

An impact enhancer apparatus comprising:

• a substantially tubular inner member;
• a substantially tubular outer member which is axially movable in relation to the inner member;
• and
• a compressible primary energy storage device comprising a level of resistive force to compression and in which energy is stored due to compression thereof when the inner member is moved in either of first and second axial directions with respect to the outer member;
• a compressible secondary energy storage device comprising a level of resistive force to compression and in which energy is stored due to compression thereof but only when the inner member is moved in the first axial direction with respect to the outer member;
• wherein the apparatus permits more energy to be stored, in both the primary and secondary energy storage devices, when the inner member is moved in the first axial direction over a certain distance with respect to the outer member compared with the amount of energy permitted to be stored in the primary energy storage device when the inner member is moved in the second axial direction over the same distance.